CN113904428B - Uninterrupted power supply system and method in power supply protection area - Google Patents
Uninterrupted power supply system and method in power supply protection area Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/062—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems for AC powered loads
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/40—Synchronising a generator for connection to a network or to another generator
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/20—End-user application control systems
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Abstract
The invention discloses an uninterrupted power supply system and a method in a power supply protection area, wherein the system comprises power supply equipment, bypass access equipment and a line branch switch; the power supply equipment is used for generating a standby power supply; the bypass access equipment is used for electrifying and merging a power supply generated by the power supply equipment into a main network in a synchronous state; the line branch switch is used for switching on or switching off the power supply of the main network power supply to the power-supply-protecting area, and further comprises a synchronization device, a power supply parameter correction device and a synchronization prediction device. The invention solves the technical problems that the power voltage and the frequency output by the power supply of the generator are difficult to meet the grid connection requirement, the time delay for collecting the power supply data of the main network is large, and the grid connection speed is low after the same period.
Description
Technical Field
The invention belongs to the technical field of power protection and supply, and particularly relates to an uninterrupted power supply system and method in a power protection and supply area.
Background
When a certain area is overhauled by a power supply system, the area needs to be protected and supplied with power. The current power-saving technology, for example, a multifunctional seamless power transfer device and method for a power distribution network emergency power generation vehicle, which are proposed in a patent with publication number of CN113098127A, support two modes of power supply to a user side, namely, a generator is connected to the user side for power supply or a battery energy storage device is connected to the user side for power supply, wherein a series compensation device is used for regulating and controlling compensation voltage and controlling tide when the generator is powered; the frequency adjusting device adjusts the voltage of the generator terminal according to the voltage of the two sides of the generator side switch and the voltage of the two sides of the load bus side switch; when the frequency of the generator terminal voltage is consistent with the frequency of the compensation voltage, and the sum of the phasor of the to-be-compensated voltage and the phasor of the generator terminal voltage is equal to the phasor of the load bus voltage, the generator is connected to a user side for supplying power; the battery energy storage device charges the direct-current capacitor through the direct-current converter; the DC converter is used for voltage conversion between the output voltage of the battery energy storage device and the DC capacitor voltage. And the parallel converter controls the output voltage of the parallel converter according to the bus side voltage so as to synchronize with the bus side voltage, and the power supply of the battery energy storage device is completed. The patent with publication number CN112865179A proposes an uninterrupted power supply intelligent grid-connected device which is connected between a power grid (also called a main power supply network and a main network), a power generation vehicle and a load and comprises a movable cabinet body, wherein a first grid-connected circuit breaker, a second grid-connected circuit breaker, a first detection module, a second detection module and a parallel-connected controller are arranged in the cabinet body; the first detection module is connected with a power grid, monitors electric operation parameters at the power grid side, the second detection module is connected with a power generation vehicle, monitors electric operation parameters at the power generation vehicle side, and the parallel operation grid-connected controller is respectively connected with the first detection module, the second detection module, the first parallel operation circuit breaker and the second parallel operation circuit breaker, and is in signal connection with the parallel operation grid-connected controllers in the plurality of uninterruptible power supply intelligent grid-connected devices. The invention can automatically sense the grid connection demands of the power grid side and the power generation vehicle side, and timely control the power generation vehicle and the power grid to be connected in the forward direction or the reverse direction according to the grid connection demands, thereby meeting the uninterrupted power consumption demands of loads.
The technology detects the electric operation parameters of the power grid side (main power supply network and main network) and the generator side, and performs grid connection and power supply switching after the parameters are judged to be consistent. However, this power-saving system has three problems: firstly, the dynamic stability of the power supply output by the power generation vehicle is insufficient, so that the power supply voltage and frequency output when the power supply of the power generation vehicle is boosted are difficult to meet the grid connection requirement, repeated debugging is needed, and the preparation time required by grid connection is long; secondly, when the power generation vehicle is far away from the power grid side, the real-time electric operation parameters of the power grid side cannot be obtained, and detection data deviation is easy to cause, so that grid connection failure is caused; thirdly, the grid connection is carried out after the electric operation parameters of the power grid side and the generator side are required to be consistent, the change of the electric parameters is not considered, the grid connection speed is low, and the power supply in the power supply protection area is discontinuous.
In the power industry, for example, patent publication number CN102237691B, a wind energy and solar grid-connected power generation system and a control method thereof, proposes to detect whether the power generation system works normally within a standard range to determine whether the power generation device can be put into use, and an integrated control unit formed by a DSP is adopted to effectively control each unit, and a neural network is adopted to predict the state parameters of the system operation, so that the defect of the control instruction execution lag grid-connected system change is overcome, and the stability of the system operation is improved. Judging whether the power generation system is normal or not through the distortion rate of the voltage and the current, and not effectively improving the problem of instability of the voltage, the frequency and the phase of the power output by the generator in the power supply protection system; in addition, the method adopts a neural network algorithm when the DSP is used for controlling the system, predicts the line voltage, current and frequency of the power grid at the next moment according to the data in the register module, and simultaneously predicts the voltage, current and frequency, so that the complexity is high, and the execution difficulty in a power supply system is high.
In order to solve the above problems, an uninterruptible power supply system and method in a power-protecting area are provided.
Disclosure of Invention
In order to solve the above problems, the present invention provides a system and a method for protecting uninterrupted power supply in a power supply area. The system is a power protection system which realizes quick, accurate and stable grid connection by correcting the output power of a power supply side, synchronizing the power supply parameters of a power grid side and predicting the same-period time point.
The invention relates to an uninterrupted power supply system in a power-protecting area, which is characterized by comprising the following components:
the power supply equipment, the bypass access equipment and the line branch switch; the power supply equipment is used for generating a standby power supply; the bypass access equipment is used for electrifying and merging a power supply generated by the power supply equipment into a main network in a synchronous state; the line branch switch is used for switching on or switching off the power supply of the main network power supply to the power-protection area.
Preferably, the power supply equipment consists of a generator set, a boosting device and a generator grid-connected switch; the bypass access equipment consists of a power grid side bypass switch and a generator cable connecting device. The generating set is a generating set or a plurality of generating sets which can be modulated in frequency and/or voltage in parallel; the boosting device is used for converting the low-voltage power supply of the generator set into a high-voltage power supply; the generator grid-connected switch is used for switching on or switching off the power supply of the power supply equipment to the power-protection area. The power grid side bypass switch is connected with the main network and connected with the line branch switch in parallel; the generator-side cable connection device is used for connecting power generated by power supply equipment to a power-supply-protecting area.
Preferably, the synchronization state means that a voltage difference, a frequency difference and a phase angle of a power supply generated by the main network power supply and the power supply equipment are within a set threshold range.
Preferably, the device further comprises a synchronizing device; the synchronization device is used for synchronizing the power data of the main network with the power data generated by the power supply; the step of synchronizing the main network power supply data with the power supply generating power supply data comprises the following steps:
acquiring transmission data between a main network and power supply equipment, wherein the transmission data comprises clock difference, transmission link delay, transmission error rate and transmission data quantity; the clock difference is calculated according to the synchronous timestamp mark in the transmission data;
calculating a time synchronization correction value according to clock differences and/or transmission link delays of the main network and the power supply equipment;
calculating a data synchronization correction value according to the transmission data quantity and/or the transmission error rate of the main network;
calculating a synchronous indication value according to the time synchronous correction value and/or the data synchronous correction value;
and synchronizing the power supply data of the main network according to the synchronization instruction value.
Further preferably, the synchronizing the main network power supply data according to the synchronization instruction value is any one or combination of calculating the synchronized main network power supply data according to a weighted sum or product of the main network power supply data obtained at each sampling time and the synchronization instruction value at the time, calculating the current power supply data deviation value according to the relation between the synchronization instruction value obtained by the test and the power supply data deviation value, and compensating the main network power supply data according to the power supply data deviation value to obtain the synchronized main network power supply data.
Preferably, the power supply parameter correction device is further included; the power supply parameter correction device is used for correcting a power supply parameter value generated by a generator set in power supply equipment into a target parameter value; the target parameter value is set according to the type of the grid and the characteristics of the grid.
Preferably, the correcting the power parameter value generated by the generator set in the power supply equipment to the target parameter value includes the steps of:
acquiring a power parameter value generated by a generator set in power supply equipment, wherein the power parameter value comprises a voltage value, a frequency value and a phase value;
calculating a parameter dynamic change reference value according to the change amount of the voltage value of the power supply generated by the generator set in a certain time and/or the change amount of the frequency value in a certain time and/or the change amount of the phase value in a certain time;
and correcting the power supply parameter value generated by the generator set into a target parameter value according to the parameter dynamic change reference value.
Preferably, the method further comprises a synchronous prediction device; the synchronization prediction device is used for predicting the time point when the power supply equipment generates a power supply and the main network power supply reaches a synchronization state; the method for predicting the time point when the power supply of the power supply equipment reaches the synchronous state with the power supply of the main network comprises the following steps:
Calculating a frequency synchronization time point according to the frequency difference change rate of the power supply equipment generating power supply and the main network power supply in a set time period;
calculating an electrical deviation value according to the voltage difference and/or the deviation degree of the phase angle of the power supply and the main network power supply at the frequency synchronization time point and the set threshold range;
when the electric deviation value is in the set allowable range, predicting the time point when the power supply equipment generates the power supply and the main network power supply reaches the synchronous state as the frequency synchronization time point; when the electric deviation value exceeds the set allowable range, calculating the time point when the power supply equipment generates the power supply and the main network power supply reach the synchronous state according to the frequency difference change rate and/or the voltage difference change rate and/or the phase angle change rate of the power supply equipment generating the power supply and the main network power supply in the set time period.
Further preferably, the calculating the frequency synchronization time point according to the frequency difference change rate of the power supply generating device and the main network power supply in the set time period includes the steps of:
acquiring the frequency difference between a power supply generated by power supply equipment and a main network power supply at each sampling moment in a set time period;
calculating the difference between the frequency difference of each sampling moment and the set frequency threshold value;
Calculating a difference change curve, namely a contemporaneous prediction curve, according to the difference value of each sampling moment;
and calculating a frequency synchronization time point according to an abscissa value corresponding to the intersection point of the contemporaneous prediction curve and the abscissa axis.
Further preferably, the calculating the electrical deviation value according to the deviation degree of the voltage difference and/or the phase angle of the power supply generated by the power supply equipment and the main network power supply at the frequency synchronization time point from the set threshold range includes the steps of:
calculating the voltage difference and/or the phase angle of the power supply equipment at the frequency synchronization time point of the power supply and the main network power supply according to the relation of the frequency, the voltage and the phase of the power supply sine wave signal;
and calculating an electrical deviation value according to the deviation degree of the voltage difference and/or the phase angle of the power supply and the main network power supply at the frequency synchronization time point and the preset voltage difference/phase angle threshold range.
Further preferably, the calculating the time point when the power supply device generates the power supply and the main network power supply to reach the synchronous state according to the frequency difference change rate and/or the voltage difference change rate and/or the phase angle change rate of the power supply device generates the power supply and the main network power supply in the set time period includes the steps of:
Calculating a frequency difference change curve and/or a voltage difference change curve and/or a phase difference change curve according to the frequency difference and/or the voltage difference and/or the phase angle of each sampling moment in a set time period and the difference value of a preset threshold range;
calculating a frequency synchronization time point and/or a voltage synchronization time point and/or a phase synchronization time point according to an abscissa value corresponding to the intersection point of the frequency difference change curve and/or the voltage difference change curve and/or the phase difference change curve with the abscissa axis;
arranging a frequency synchronization time point, a voltage synchronization time point and a phase synchronization time point according to a time sequence to form a synchronous queue;
and taking the time point of the last position of the synchronous queue as the time point when the power supply equipment generates the power supply and the main network power supply to reach the synchronous state.
A computer readable storage medium storing a computer program for electronic data exchange, wherein the computer program, when executed by a processor, causes a computer to perform any of the methods described above.
The invention relates to a method for uninterrupted power supply in a power-protecting area, which is characterized by comprising the following steps:
before the main network is disconnected, a generator set of power supply equipment is started, and after the power supply parameter correction device corrects the power supply parameter value generated by the power supply generator set into a target parameter value according to the method, a voltage boosting device of the power supply equipment boosts the voltage and frequency of a power supply generated by the power supply equipment to be within a set threshold range with the voltage difference and the frequency difference of the power supply of the main network; after the synchronization device synchronizes the main network power supply data with the local power supply data according to the method, the synchronization prediction device predicts the time point when the power supply equipment generates the power supply and the main network power supply to reach the synchronization state according to the method, and the generator grid-connected switch of the power supply equipment is switched on at the time point;
When the main network is restored, the synchronization device synchronizes the main network power supply data with the local power supply data according to the method; the synchronization predicting device predicts the time point when the power supply equipment generates the power supply and the main network power supply reach the synchronization state according to the method, and the bypass switch in the bypass access equipment is switched on at the time point.
The system and the method have the advantages that:
(1) The power supply parameter correction device compensates the power supply parameter generated by the generator set to be a target parameter value close to the grid-connected requirement according to the dynamic parameter variation of the power supply generated by the generator set, and compared with the traditional technical scheme of boosting only the power supply generated by the generator set, the time for boosting to the grid-connected required parameter can be effectively reduced.
(2) The synchronization device calculates a synchronization instruction value according to the clock difference and the transmission link delay of the main network and the power supply equipment, the transmission data quantity and the transmission error rate, predicts and corrects the received main network data on the basis of not changing the transmission delay, realizes real-time synchronization of the main network power supply data and the power supply data, not only can effectively improve the grid connection success rate, but also reduces the grid connection time.
(3) The synchronous prediction device calculates a frequency synchronization time point according to a change curve of the frequency difference, the frequency synchronization time point is used as a synchronous time point when the electric deviation value is in an allowable range, and the synchronous time point is calculated according to a voltage difference change rate and/or a phase angle change rate when the electric deviation value exceeds the allowable range, so that quick and accurate grid connection can be realized on the basis.
Drawings
Fig. 1 is a schematic diagram of an uninterruptible power supply system in a power protection area according to an embodiment of the invention.
FIG. 2 is a schematic diagram of a contemporaneous prediction curve according to an embodiment of the present invention.
Fig. 3 is a schematic structural diagram of an uninterruptible power supply system in a power protection area according to another embodiment of the invention.
Fig. 4 is a flowchart of a method for uninterruptible power supply in a power-protected area according to an embodiment of the invention.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that variations and modifications could be made by those skilled in the art without departing from the inventive concept. These are all within the scope of the present invention.
An embodiment of an uninterruptible power supply system in a power-protecting area according to the present invention is characterized by comprising:
the power supply equipment, the bypass access equipment and the line branch switch; the power supply equipment is used for generating a standby power supply; the bypass access equipment is used for electrifying and merging a power supply generated by the power supply equipment into a main network in a synchronous state; the line branch switch is used for switching on or switching off the power supply of the main network power supply to the power-protection area.
Preferably, the power supply equipment consists of a generator set, a boosting device and a generator grid-connected switch; the bypass access equipment consists of a power grid side bypass switch and a generator cable connecting device. The power generation unit is a power generation device or a plurality of power generation devices which can be used for adjusting frequency and/or voltage, the boosting device is used for converting low-voltage power of the power generation unit into high-voltage power, and the generator grid-connected switch is used for switching on or switching off power supply of power supply equipment to a power supply protection area; the power grid side bypass switch is connected with the main network and connected with the line branch switch in parallel; the generator-side cable connection device is used for connecting power generated by power supply equipment to a power-supply-protecting area. In this embodiment, a schematic diagram of a module of an uninterruptible power supply system in a power-supply-protected area is shown in fig. 1, and a circuit breaker exists between a main network and the power supply area according to a power network deployment standard. The generator set can be realized by adopting a comprehensive power generation vehicle or by adopting a plurality of power generation vehicles in parallel, and the voltage or frequency of the power source generated by the generator set can be regulated by a manual or automatic device on the power generation vehicle, so that the generator set has the functions of frequency modulation and/or voltage regulation. The booster unit is realized by adopting a lifting cabinet. One end of the generator grid-connected switch is connected behind the boosting device, and the other end of the generator grid-connected switch is connected to the generator side cable connecting device of the bypass access equipment, and when the generator grid-connected switch is connected, the high-voltage power of the boosting device is output to the power-supply-protecting area through the generator side cable connecting device of the bypass access equipment. When the power grid side bypass switch is connected, a power supply generated by the power supply equipment is connected with a main network power supply in parallel, and the power supply is jointly supplied to a power-protecting area. One end of the generator side cable connection device is connected with a generator grid-connected switch, a power-protection area and a grid side bypass switch of the power supply equipment, and is used for connecting a power supply generated by the power supply equipment to the power-protection area.
In another preferred embodiment, a main transformer protection device is installed in front of the voltage boosting device and is used for protecting the low-voltage power generated by the generator set.
Preferably, the synchronization state means that a voltage difference, a frequency difference and a phase angle of a power supply generated by the main network power supply and the power supply equipment are within a set threshold range. In this embodiment, a voltage difference threshold range of 0-10% of a voltage difference in a synchronous state is generally set in a thermal power system, a frequency difference threshold range is 0-0.4 hz, and a phase angle threshold range is 0-15 degrees. When the voltage difference, the frequency difference and the phase angle of the power generated by the main network power supply and the power supply equipment are within the threshold range, the main network power supply and the power generated by the power supply equipment are in a synchronous state, and electrified grid connection can be performed.
In another preferred embodiment, the device further comprises a synchronizing device; the synchronization device is used for synchronizing the power supply data of the main network with the power supply data generated by the power supply. In this embodiment, the synchronization device includes a data transmission unit and a data processing unit, the synchronization device is installed in the power supply device, the data transmission unit is used for transmitting the main network power supply data to the data processing unit, and the data processing unit runs a program to perform synchronization processing on the main network power supply data. The program performs a method of synchronizing mains power data with mains generated power data, comprising the steps of:
Acquiring transmission data between a main network and power supply equipment, wherein the transmission data comprises clock difference, transmission link delay, transmission error rate and transmission data quantity; the clock difference can be calculated according to the synchronous timestamp mark in the transmission data;
calculating a time synchronization correction value according to clock differences and/or transmission link delays of the main network and the power supply equipment;
calculating a data synchronization correction value according to the transmission data quantity and/or the transmission error rate of the main network;
calculating a synchronous indication value according to the time synchronous correction value and/or the data synchronous correction value;
and synchronizing the power supply data of the main network according to the synchronization instruction value.
In this embodiment, a data structure adopted during data transmission includes a synchronous timestamp mark, a data acquisition time is recorded, a clock difference is calculated according to the synchronous timestamp mark and a local timestamp in main network transmission data, and an average time delay and a transmission error rate of a transmission link are calculated according to multiple groups of test data;
the calculating the time synchronization correction value according to the clock difference and/or the transmission link delay of the main network and the power supply equipment is as follows: the method comprises the steps of calculating a time synchronization correction value according to the positive correlation between the clock difference of the main network and the power supply equipment and the time synchronization correction value, calculating the time synchronization correction value according to the positive correlation between the transmission link time delay and the time synchronization correction value, and calculating any one of the time synchronization correction value according to the positive correlation between the clock difference of the main network and the power supply equipment and the positive correlation between the transmission link time delay and the time synchronization correction value, wherein the time synchronization correction value is represented by a variable m.
The data synchronization correction value is calculated according to the data volume of the main network and/or the transmission error rate, and is: and calculating any one of the data synchronization correction value according to the positive correlation between the data quantity of the main network and the data synchronization correction value, the data synchronization correction value according to the positive correlation between the transmission error rate and the data synchronization correction value, and the data synchronization correction value according to the positive correlation between the sum of the data quantity of the main network and the positive correlation between the transmission error rate and the data synchronization correction value, wherein the data synchronization correction value is represented by a variable n.
The synchronization instruction value is calculated according to the positive correlation relation between the synchronization instruction value and the time synchronization correction value and/or the data synchronization correction value, and the synchronization correction value is represented by a variable a.
In table a, A1 to A3 represent different embodiments for calculating the synchronization instruction value a, wherein the time synchronization correction value m and the data synchronization correction value n in table a are calculated by using the calculation formulas in the above embodiments.
Table a different embodiments of calculating synchronization indication values
Further preferably, the synchronizing the main network power supply data according to the synchronization instruction value is any one or combination of calculating the synchronized main network power supply data according to a weighted sum or product of the main network power supply data obtained at each sampling time and the synchronization instruction value at the time, calculating the current power supply data deviation value according to the relation between the synchronization instruction value obtained by the test and the power supply data deviation value, and compensating the main network power supply data according to the power supply data deviation value to obtain the synchronized main network power supply data.
In a preferred embodiment, the synchronized main network power supply data is calculated from a weighted sum or product of the main network power supply data obtained at the sampling time and the synchronization instruction value at the time. In this embodiment, a synchronization device at a certain time acquires power supply data of a set of main networks, calculates a synchronization instruction value a=1.2 at the current time according to the method (e.g. A3) described in any one of the table a, and multiplies the synchronization instruction value a as a correction coefficient by the acquired power supply data of the set of main networks to obtain a set of synchronized power supply data of the main networks.
In another preferred embodiment, the current power supply data deviation value is calculated according to the relation between the synchronization instruction value obtained through the test training in advance and the power supply data deviation value, and the main network power supply data after synchronization is obtained by compensating the main network power supply data according to the power supply data deviation value. In this embodiment, power supply data bias values corresponding to different synchronization instruction values (or a fuzzy function relation between a synchronization correction value and the power supply data bias values) are obtained in advance through sending and receiving test data multiple times, a synchronization device obtains power supply data of a group of main networks at a certain moment, a synchronization instruction value a=1.2 at the current moment is calculated according to a method (for example, A3) in any one of the table a, the synchronization instruction value a is substituted into a corresponding table or a fuzzy function relation between the synchronization correction value and the power supply data bias values to obtain the power supply data bias value at the current moment, and the corresponding power supply data bias values are compensated on the basis of the obtained power supply data of the group of main networks to obtain a group of synchronized main network power supply data.
In another preferred embodiment, the device further comprises a power supply parameter correction device; the power supply parameter correction device is used for correcting a power supply parameter value generated by a generator set in power supply equipment into a target parameter value. In this embodiment, the power supply parameter correction device includes a power supply parameter acquisition unit and a power supply parameter compensation unit, the power supply parameter correction device is installed in a power supply device, the power supply parameter acquisition unit is used for acquiring a power supply parameter value generated by a generator set, and the power supply parameter compensation unit operates a program to correct the power supply parameter value generated by the generator set in the power supply device to a target parameter value. The target parameter value is set according to the type of the grid and the characteristics of the grid. The program performs a method of correcting a power parameter value generated by a generator set in a power supply apparatus to a target parameter value, comprising the steps of:
acquiring a power parameter value generated by a generator set in power supply equipment, wherein the power parameter value comprises a voltage value, a frequency value and a phase value;
calculating a parameter dynamic change reference value according to the change amount of the voltage value of the power supply generated by the generator set in a certain time and/or the change amount of the frequency value in a certain time and/or the change amount of the phase value in a certain time;
And correcting the power supply parameter value generated by the generator set into a target parameter value according to the parameter dynamic change reference value.
In this embodiment, the power supply acquisition unit acquires (at a certain sampling time interval, for example, 10 ms) a plurality of voltage values, frequency values and phase values of the power supply generated by the generator set within a set time period (for example, 1 second), and sends the data to the power supply parameter compensation unit;
the parameter dynamic change reference value is calculated according to the change amount of the voltage value of the power supply generated by the generator set in a certain time and/or the change amount of the frequency value in a certain time and/or the change amount of the phase value in a certain time, and is: calculating a parameter dynamic change reference value according to the positive correlation relation between the change quantity of the voltage value in a certain time and the parameter dynamic change reference value, and according toThe method comprises the steps of calculating a parameter dynamic change reference value according to the positive correlation relation between the change amount of a frequency value in a certain time and a parameter dynamic change reference value, calculating a parameter dynamic change reference value according to the positive correlation relation between the change amount of a phase value in a certain time and the parameter dynamic change reference value, calculating a parameter dynamic change reference value according to the positive correlation relation between the change amount of a voltage value and a frequency value in a certain time and the parameter dynamic change reference value, calculating a parameter dynamic change reference value according to the positive correlation relation between the change amount of a frequency value and a phase value in a certain time and the parameter dynamic change reference value, calculating any one item of parameter dynamic change reference values according to the positive correlation relation between the change amount of a voltage value and a frequency value in a certain time and the change amount of a phase value in a certain time and the parameter dynamic change reference value, wherein the change amount of a power parameter value (including the voltage value, the frequency value and the phase value) in a certain time refers to the average value of parameter value of each adjacent sampling moment in a set time, the average value of parameter value of each adjacent sampling moment in a set time, the maximum value of parameter value of each adjacent sampling moment in a set time, and the maximum value of each adjacent sampling moment in a set time, and each set parameter value of each adjacent sampling value in a set time, and each set parameter value of variance of each parameter value. In this embodiment, a certain time is set to 1 second in advance, the variation of the voltage value and/or the frequency value and/or the phase value at adjacent sampling time is calculated, the variation of the voltage value and/or the frequency value and/or the phase value at a certain time is obtained according to the average value of the variation of a plurality of adjacent sampling time, the variation of the power parameter value (including the voltage value, the frequency value and the phase value) at a certain time is represented by a variable u, a parameter dynamic variation reference value is calculated according to the positive correlation between the variation of the voltage value and/or the frequency value and the power parameter dynamic variation reference value at a certain time, the parameter dynamic variation reference value is represented by a variable b, for example, a calculated parameter dynamic variation reference value b=r1·u, wherein r1 is a calculation coefficient obtained according to training of test data in advance, and the calculation coefficient represents the influence of the instability of the voltage value and/or the frequency value and/or the phase value The degree; or calculating parameter dynamic change reference value b=r2·u r3 ，r2、r3(r3>0) Is a calculation coefficient which is trained according to a plurality of test data in advance and represents the instability influence degree of the voltage value and/or the frequency value and/or the phase value.
The correction of the power parameter value generated by the generator set to the target parameter value according to the parameter dynamic change reference value adopts the existing power compensation technical scheme, calculates the power parameter value to be compensated according to the power parameter dynamic change reference value b, including a voltage value and/or a frequency value and/or a phase value, generates a compensation power according to the compensation power parameter value (voltage value, frequency value and phase value) at each moment, and superimposes the compensation power with the power generated by the original motor set so that the voltage value and/or the frequency value and/or the phase value of the superimposed power are the target parameter value (different target parameter values are set according to different power grid types and power grid characteristics, such as different target parameter values according to the characteristics of water power, wind power and thermal power).
In another preferred embodiment, the device further comprises a synchronization prediction device; the synchronization prediction device is used for predicting a time point when the power supply equipment generates a power supply and the main network power supply reaches a synchronization state. In this embodiment, the synchronization prediction apparatus may be disposed in a bypass access device or a power supply device, or may operate as an independent device, where the synchronization prediction apparatus includes a synchronization data acquisition unit and a data prediction unit, where the synchronization data acquisition unit is configured to acquire a parameter of a power supply device generating a power supply and a main network power supply parameter, and the data prediction unit operates a program for predicting a time point when the power supply device generating the power supply and the main network power supply reach a synchronization state. The program execution method predicts the time point when the power supply equipment generates the power supply and the main network power supply reach the synchronous state according to the main network power supply parameter and the power supply parameter, and comprises the following steps:
Calculating a frequency synchronization time point according to the frequency difference change rate of the power supply equipment generating power supply and the main network power supply in a set time period;
calculating an electrical deviation value according to the voltage difference and/or the deviation degree of the phase angle of the power supply and the main network power supply at the frequency synchronization time point and the set threshold range;
when the electric deviation value is in the set allowable range, predicting the time point when the power supply equipment generates the power supply and the main network power supply reaches the synchronous state as the frequency synchronization time point; when the electric deviation value exceeds the set allowable range, calculating the time point when the power supply equipment generates the power supply and the main network power supply reach the synchronous state according to the frequency difference change rate and/or the voltage difference change rate and/or the phase angle change rate of the power supply equipment generating the power supply and the main network power supply in the set time period.
Preferably, the calculating the frequency synchronization time point according to the frequency difference change rate of the power supply generating device and the main network power supply in the set time period includes the steps of:
acquiring the frequency difference between a power supply generated by power supply equipment and a main network power supply at each sampling moment in a set time period;
calculating the difference value between the frequency difference of each sampling moment and a preset frequency threshold value;
Calculating a difference change curve, namely a contemporaneous prediction curve, according to the difference value of each sampling moment;
and calculating a frequency synchronization time point according to an abscissa value corresponding to the intersection point of the synchronous prediction curve and the abscissa.
In this embodiment, the synchronous data acquisition unit acquires the frequency difference f between the power supply device and the main network power supply at each sampling time within a set period (for example, within 10 seconds from the current time) i I represents a sampling time sequence number;
calculate the frequency difference f at each sampling instant i Difference h from a threshold range (0-F) set in advance i ，h i ＝f i -F；
According to the difference h of each sampling time i Calculating a difference change curve, called a synchronous prediction curve, with the abscissa representing the sampling time sequence number value and the ordinate representing the difference h i The method comprises the steps of carrying out a first treatment on the surface of the In practical application, the grid connection is performed by continuously adjusting the output voltage and frequency of the generator set, and different difference values are obtained according to different generator adjusting amplitude and adjusting specificationsThe change curve is subjected to synchronous prediction based on the current difference change curve, so that the time point for achieving frequency synchronization under the current adjusting amplitude can be effectively predicted.
Calculating a frequency synchronization time point t according to an abscissa value corresponding to the intersection point of the synchronous prediction curve and the abscissa axis f 。
Taking a certain moment as a starting point, selecting a difference value h in the first 4 sampling moments i 1,0.7,0.5,0.35, respectively, to obtain a graph as shown in FIG. 2, the abscissa value corresponding to the intersection of the curve and the abscissa is t 6 I.e. frequency synchronisation time point t f ＝t 6 (sample time 6).
Preferably, the calculating the electrical deviation value according to the deviation degree of the voltage difference and/or the phase angle of the power supply generated by the power supply equipment and the main network power supply at the frequency synchronization time point from the set threshold range includes the steps of:
calculating the voltage difference and/or the phase angle of the power supply equipment at the frequency synchronization time point of the power supply and the main network power supply according to the relation of the frequency, the voltage and the phase of the power supply sine wave signal;
and calculating an electrical deviation value according to the deviation degree of the voltage difference and/or the phase angle of the power supply and the main network power supply at the frequency synchronization time point and the preset voltage difference/phase angle threshold range.
In this embodiment, the calculating the electrical deviation value according to the degree of deviation between the voltage difference and/or the phase angle of the power supply generated by the power supply device and the main network power supply at the frequency synchronization time point and the preset voltage difference/phase angle threshold range is: calculating an electrical deviation value from a positive correlation of a deviation value (difference from threshold range boundary value) or a deviation ratio (ratio of difference to threshold range) of a voltage difference between a power supply apparatus generating power source and a mains power source at a frequency synchronization time point and a preset voltage difference threshold range, and calculating an electrical deviation value from a positive correlation of a deviation value (difference from threshold range boundary value) or a deviation ratio (ratio of difference to threshold range) of a phase angle between a power supply apparatus generating power source and a mains power source at a frequency synchronization time point and a preset phase angle threshold range or a deviation ratio (ratio of difference to threshold range) and an electrical deviation value The positive correlation of the air deviation value is used for calculating any one of the electric deviation value, and the weighted sum or the positive correlation of the product of the deviation value (the difference between the difference and the threshold range) of the voltage difference between the power supply equipment and the main network power supply at the frequency synchronization time point and the preset voltage difference threshold range or the deviation ratio (the difference between the difference and the threshold range) of the deviation value (the ratio between the difference and the threshold range) of the phase angle between the power supply equipment and the main network power supply at the frequency synchronization time point and the preset phase angle threshold range or the deviation ratio (the difference between the difference and the threshold range) of the deviation value and the electric deviation value. For example, a deviation value of a voltage difference between a power supply source device generating a power supply and a main network power supply at a frequency synchronization time point and a voltage difference threshold value range set in advance is represented by a variable p, and an electric deviation value is represented by a variable c. In a preferred embodiment, the electrical deviation value c=g1·p is calculated, where g1 is a calculation coefficient trained on a plurality of test data in advance, the calculation coefficient representing the extent to which the voltage deviation affects the electrical deviation. In another preferred embodiment, the electrical deviation value c=g2·p is calculated g3 Wherein g2, g3 (g 3)>0) According to the calculation coefficient obtained through training of test data for a plurality of times in advance, the calculation coefficient represents the influence degree of voltage deviation on electric deviation.
Different electrical deviation tolerance ranges are set in advance according to different main network types and network characteristics, for example, the electrical deviation tolerance ranges are (-1, 1).
When the electrical deviation value c is within the electrical deviation tolerance range, i.e., -1<c<1, the time point when the power generated by the power supply equipment and the main network power supply are predicted to reach the synchronous state is taken as a frequency synchronization time point t f . At this time, the frequency synchronization time point is directly used as a predicted synchronization time point, and compared with a conventional prediction means in the electrical field, the computational complexity of prediction is reduced.
When the electrical deviation value c exceeds the electrical deviation allowable range, namely c is less than or equal to-1 or c is more than or equal to 1, calculating the time point when the power supply equipment generates the power and the main network power to reach the synchronous state according to the frequency difference change rate and/or the voltage difference change rate and/or the phase angle change rate of the power supply equipment generating the power and the main network power in the set time period, wherein the time point comprises the following steps:
calculating a frequency difference change curve and/or a voltage difference change curve and/or a phase difference change curve according to the frequency difference and/or the voltage difference and/or the phase angle of each sampling time within a set time period and the difference value of a set threshold range;
And calculating a frequency synchronization time point and/or a voltage synchronization time point and/or a phase synchronization time point according to the abscissa value corresponding to the intersection point of the frequency difference change curve and/or the voltage difference change curve and/or the phase difference change curve with the abscissa axis.
Comparing the frequency synchronization time point, the voltage synchronization time point and the phase synchronization time point and arranging the frequency synchronization time point, the voltage synchronization time point and the phase synchronization time point into a synchronous queue according to time sequence;
and taking the time point of the last position of the synchronous queue as the time point when the power supply equipment generates the power supply and the main network power supply to reach the synchronous state.
In this embodiment, the contemporaneous data acquisition unit acquires a frequency difference and/or a voltage difference and/or a phase angle at each sampling time within a set period of time; calculating the difference value between the frequency difference and/or the voltage difference and/or the phase angle of each sampling moment and the preset frequency difference and/or the preset voltage difference and/or the preset phase angle threshold range; and calculating a frequency difference change curve and/or a voltage difference change curve and/or a phase difference change curve according to the difference value of each sampling time, wherein an abscissa represents the serial number value of the sampling time, an ordinate represents the difference value, the intersection points of one or more change curves and the abscissa are arranged according to the coordinate axis sequence to form a synchronous queue, and the time point at the tail of the synchronous queue is the time point when the predicted power supply equipment generates a power supply and the main network power supply reaches the synchronous state.
The uninterrupted power supply system in the power supply protection area comprises power supply equipment, bypass access equipment, a line branch switch, a synchronizing device, a power supply parameter correcting device and a synchronization predicting device, wherein the system structure schematic diagram is shown in fig. 3.
A computer readable storage medium storing a computer program for electronic data exchange, wherein the computer program, when executed by a processor, causes a computer to perform any of the methods described above.
The flowchart of the uninterrupted power supply method in the power supply protection area according to the embodiment of the invention is shown in fig. 4, and is characterized by comprising the following steps:
before the main network is disconnected, a generator set of power supply equipment is started, and after the power supply parameter correction device corrects the power supply parameter value generated by the power supply generator set into a target parameter value according to the method, a voltage boosting device of the power supply equipment boosts the voltage and frequency of a power supply generated by the power supply equipment to be within a set threshold range with the voltage difference and the frequency difference of the power supply of the main network; after the synchronization device synchronizes the main network power supply data with the local power supply data according to the method, the synchronization prediction device predicts the time point when the power supply equipment generates the power supply and the main network power supply to reach the synchronization state according to the method, and the generator grid-connected switch of the power supply equipment is switched on at the time point;
When the main network is restored, the synchronization device synchronizes the main network power supply data with the local power supply data according to the method; the synchronization predicting device predicts the time point when the power supply equipment generates the power supply and the main network power supply reach the synchronization state according to the method, and the bypass switch in the bypass access equipment is switched on at the time point.
In this embodiment, taking a power main network in a certain area as an example, the connection modes between the devices are that 10KV shunt lines (for example, flexible cables with fast plug) are used to connect in an electrified mode, and three connection modes of a power supply device and a bypass access device are adopted: engineering cable connection, quick plug connector connection and elbow type cable plug connector connection. By starting the generator car, namely the generator set of the power supply equipment, checking the phase sequence on the low-voltage breaker busbar of the generator set, and switching the generator into an automatic state after the phase sequence is correct. The power supply parameter correction device corrects the power supply parameter value generated by the power supply generator set into a target parameter value according to the method. The voltage and frequency of the power supply generated by the power supply equipment are increased to be within a set threshold range by the voltage boosting device of the power supply equipment, the voltage and frequency difference of the power supply generated by the power supply equipment and the main network power supply are usually 400V low-voltage power supply with the frequency of 50Hz, and the voltage is required to be boosted to be about 10 kilovolts by the voltage boosting device of the power supply equipment. And after the synchronization device synchronizes the main network power supply data with the power supply generation power supply data, the synchronization prediction device predicts the time point when the power supply equipment generation power supply and the main network power supply reach the synchronization state according to the synchronized data, and the generator grid-connected switch of the power supply equipment is switched on at the time point (namely, the generator grid-connected switch of the power supply equipment is automatically closed), so that the power supply equipment is successfully electrified and is integrated into the 10 kilovolt power grid for operation. And finally, the line branch switch is disconnected, the main network is powered off (a group of ground wires are hung on the power grid side of the branch switch in engineering), and the power supply generated by the power supply equipment independently supplies power to the power protection area.
And after the power grid overhaul is finished, the power supply of the main grid needs to be restored seamlessly. The synchronization device synchronizes the power supply data of the main network with the power supply generating power supply data according to the method, and the synchronization prediction device predicts the time point when the power supply generating power supply device generates power supply and the power supply of the main network reach the synchronization state according to the method, and at the time point, a bypass switch in the bypass access device is switched on (namely, the bypass switch of the bypass access device is automatically switched on), and at the moment, the power supply generating power supply device generates power supply to be electrified and integrated into the main network. And then the line branch switch is turned on (the ground wire on the power grid side of the branch switch is removed), the main network power supply and the power supply equipment generate power to supply power to the power-saving area simultaneously, and finally the power supply equipment is turned off, the main network power supply is used for independently supplying power to the power-saving area, and the power supply seamless recovery of the main network for supplying power to the power-saving area by the power supply equipment is realized.
Of course, those skilled in the art will recognize that the above embodiments are merely illustrative of the present invention and not intended to be limiting, and that changes and modifications of the above embodiments are within the scope of the present invention.
Claims (7)
1. An uninterruptible power supply system in a power protection area, comprising:
the power supply equipment, the bypass access equipment and the line branch switch; the power supply equipment is used for generating a standby power supply; the bypass access equipment is used for electrifying and merging a power supply generated by the power supply equipment into a main network in a synchronous state; the line branch switch is used for switching on or switching off the power supply of the main network power supply to the power protection area;
the device also comprises a synchronous prediction device; the synchronization prediction device is used for predicting the time point when the power supply equipment generates a power supply and the main network power supply reaches a synchronization state; the method for predicting the time point when the power supply of the power supply equipment reaches the synchronous state with the power supply of the main network comprises the following steps: calculating a frequency synchronization time point according to the frequency difference change rate of the power supply equipment generating power supply and the main network power supply in a set time period; calculating an electrical deviation value according to the voltage difference and/or the deviation degree of the phase angle of the power supply and the main network power supply at the frequency synchronization time point and the set threshold range; when the electric deviation value is in the set allowable range, predicting the time point when the power supply equipment generates the power supply and the main network power supply reaches the synchronous state as the frequency synchronization time point; when the electric deviation value exceeds the set allowable range, calculating a time point when the power supply equipment generates a power supply and the main network power supply reach a synchronous state according to the frequency difference change rate and/or the voltage difference change rate and/or the phase angle change rate of the power supply equipment generating the power supply and the main network power supply in a set time period;
The calculating the frequency synchronization time point according to the frequency difference change rate of the power supply equipment generating power supply and the main network power supply in the set time period comprises the following steps: acquiring the frequency difference between a power supply generated by power supply equipment and a main network power supply at each sampling moment in a set time period; calculating the difference between the frequency difference of each sampling moment and the set frequency threshold value; calculating a difference change curve, namely a contemporaneous prediction curve, according to the difference value of each sampling moment; calculating a frequency synchronization time point according to an abscissa value corresponding to the intersection point of the contemporaneous prediction curve and the abscissa axis;
the calculating the time point that the power supply equipment generates the power supply and the main network power supply reach the synchronous state according to the frequency difference change rate and/or the voltage difference change rate and/or the phase angle change rate of the power supply equipment generating the power supply and the main network power supply in the set time period comprises the following steps: calculating a frequency difference change curve and/or a voltage difference change curve and/or a phase difference change curve according to the frequency difference and/or the voltage difference and/or the phase angle of each sampling time within a set time period and the difference value of a set threshold range; calculating a frequency synchronization time point and/or a voltage synchronization time point and/or a phase synchronization time point according to an abscissa value corresponding to the intersection point of the frequency difference change curve and/or the voltage difference change curve and/or the phase difference change curve with the abscissa axis; arranging a frequency synchronization time point, a voltage synchronization time point and a phase synchronization time point according to a time sequence to form a synchronous queue; and taking the time point of the last position of the synchronous queue as the time point when the power supply equipment generates the power supply and the main network power supply to reach the synchronous state.
2. The uninterruptible power supply system in a power-protected area according to claim 1, wherein the power supply equipment is composed of a generator set, a boosting device and a generator grid-connected switch; the bypass access equipment consists of a power grid side bypass switch and a generator cable connecting device; the synchronous state means that the voltage difference, the frequency difference and the phase angle between the power supply and the main network power supply generated by the power supply equipment are within a set threshold range.
3. The uninterruptible power supply system in a power conservation area of claim 1, further comprising a synchronization device; the synchronization device is used for synchronizing the power supply data of the main network with the power supply data generated by the power supply equipment; the step of synchronizing the main network power supply data with the power supply generating power supply data comprises the following steps:
acquiring transmission data between a main network and power supply equipment, wherein the transmission data comprises clock error, transmission link delay, transmission error rate and transmission data quantity;
calculating a time synchronization correction value according to clock differences and/or transmission link delays of the main network and the power supply equipment;
calculating a data synchronization correction value according to the transmission data quantity and/or the transmission error rate of the main network;
calculating a synchronous indication value according to the time synchronous correction value and/or the data synchronous correction value;
And synchronizing the power supply data of the main network according to the synchronization instruction value.
4. A uninterruptible power supply system in a power-saving area according to claim 3, wherein the synchronization of the main network power supply data according to the synchronization instruction value is any one of or a combination of calculating the synchronized main network power supply data according to a weighted sum or a product of the main network power supply data obtained at each sampling time and the synchronization instruction value at the time, calculating a current power supply data deviation value according to a corresponding relation between the synchronization instruction value obtained by the test and the power supply data deviation value, and compensating the main network power supply data according to the power supply data deviation value to obtain the synchronized main network power supply data.
5. The uninterruptible power supply system in the power-protected area according to claim 2, further comprising power supply parameter correction means; the power supply parameter correction device is used for correcting a power supply parameter value generated by a generator set in power supply equipment into a target parameter value; the target parameter value is set according to the type of the grid and the characteristics of the grid.
6. The uninterruptible power supply system in the power-protected area according to claim 5, wherein the correcting the power parameter value generated by the generator set in the power supply unit to the target parameter value includes the steps of:
Acquiring a power parameter value generated by a generator set in power supply equipment, wherein the power parameter value comprises a voltage value, a frequency value and a phase value;
calculating a parameter dynamic change reference value according to the change amount of the voltage value of the power supply generated by the generator set in a certain time and/or the change amount of the frequency value in a certain time and/or the change amount of the phase value in a certain time;
and correcting the power supply parameter value generated by the generator set into a target parameter value according to the parameter dynamic change reference value.
7. An uninterruptible power supply method in a power protection area is characterized by comprising the following steps:
before the main network is disconnected, a generator set of the power supply equipment is started, and after the power supply parameter value generated by the generator set is corrected to a target parameter value by the power supply correction device according to the method as claimed in claim 5, the voltage and frequency of the power supply generated by the power supply equipment are increased to be within the set threshold range by the voltage and frequency difference of the power supply equipment; after the synchronization device synchronizes the main network power supply data and the power supply generation power supply data according to the method of claim 3, the synchronization prediction device predicts the time point when the power supply generation power supply device and the main network power supply reach the synchronization state according to the method of claim 1, and the generator grid-connected switch of the power supply device is turned on at the time point;
When the main network is restored, the synchronization device synchronizes the main network power supply data with the power supply generating power supply data according to the method as claimed in claim 3; the synchronization predicting means predicts a point in time when the power supply device generates a power supply that is in a synchronization state with the main network power supply, at which point the bypass switch in the bypass access device is turned on, according to the method as claimed in claim 1.
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