CN113285462A - Intelligent voltage stabilizing device of power transmission line, control method, equipment and medium - Google Patents
Intelligent voltage stabilizing device of power transmission line, control method, equipment and medium Download PDFInfo
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 61
- 230000000087 stabilizing effect Effects 0.000 title claims abstract description 53
- 238000000034 method Methods 0.000 title claims abstract description 27
- 230000002457 bidirectional effect Effects 0.000 claims abstract description 87
- 239000003990 capacitor Substances 0.000 claims abstract description 32
- 239000003381 stabilizer Substances 0.000 claims abstract description 28
- 238000004146 energy storage Methods 0.000 claims description 33
- 239000013643 reference control Substances 0.000 claims description 20
- 230000014509 gene expression Effects 0.000 claims description 11
- 238000010586 diagram Methods 0.000 claims description 10
- 238000007599 discharging Methods 0.000 claims description 4
- 238000005259 measurement Methods 0.000 claims description 3
- 230000001276 controlling effect Effects 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 230000006641 stabilisation Effects 0.000 description 3
- 238000011105 stabilization Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000010248 power generation Methods 0.000 description 2
- 238000013468 resource allocation Methods 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000005097 cold rolling Methods 0.000 description 1
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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
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
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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
- H02J3/01—Arrangements for reducing harmonics or ripples
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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
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
- H02J3/16—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by adjustment of reactive power
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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
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
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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
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/48—Controlling the sharing of the in-phase component
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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
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/50—Controlling the sharing of the out-of-phase component
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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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
Abstract
The application discloses transmission line's intelligent voltage regulator and control method, equipment, medium, the device includes: the bidirectional voltage source type power converter comprises a bidirectional voltage source type power converter, a non-sensitive load, a first capacitor and an inductor; the first end of the bidirectional voltage source type power converter is connected with the first end of the inductor, the second end of the inductor is connected with the first end of the first capacitor, and the second end of the first capacitor is connected with the first end of the non-sensitive load; the second end of the bidirectional voltage source type power converter is connected with the second end of the first capacitor and the first end of the non-sensitive load; the intelligent voltage stabilizer is connected in parallel on the power transmission line; and the intelligent voltage stabilizing devices are controlled by the improved control method, so that the intelligent voltage stabilizing devices work coordinately. Therefore, the technical problems of large volume, high cost and incapability of coordinated work in the prior art are solved.
Description
Technical Field
The application relates to the technical field of electric power, in particular to an intelligent voltage stabilizing device of a power transmission line, a control method, equipment and a medium.
Background
With the continuous expansion of the scale of a power grid, the traditional energy supply is increasingly tense, the power consumption demand of a user is continuously improved, and on the power supply side, the penetration rate of discontinuous new energy such as distributed power generation, solar energy, wind energy and the like in the power grid is continuously increased; on the load side, the use of a large number of power electronic devices and high-power nonlinear loads, such as arc furnaces and cold rolling mills, and also large-capacity single-phase loads makes the voltage of a low-voltage distribution network unstable and the power supply quality uneven.
In order to improve voltage fluctuation, the traditional technology realizes instantaneous power supply and demand balance through power energy storage, but the economic cost and the functional bottleneck limit the scale development of the traditional technology. In the prior art, reactive power balance is realized through a reactive power compensator to stabilize voltage, but the reactive power compensation cannot be continuously adjusted, so that more harmonic waves can be generated, the device has larger volume and higher cost; further, the control system for controlling the reactive power compensator is high in cost, and particularly, since the reference voltage of a plurality of reactive power compensators (voltage stabilizing devices) in the control system is generally directly adopted as the rated voltage of the line, and each reactive power compensator operates independently and does not work in coordination.
Disclosure of Invention
The application provides an intelligent voltage stabilizing device of a power transmission line, a control method, equipment and a medium, which are used for solving the technical problems that the prior art is large in size, high in cost and incapable of working coordinately.
In view of this, the first aspect of the present application provides an intelligent voltage stabilizing apparatus for a power transmission line, the apparatus including:
the first end of the bidirectional voltage source type power converter is connected with the first end of the inductor, the second end of the inductor is connected with the first end of the first capacitor, and the second end of the first capacitor is connected with the first end of the non-sensitive load;
the second end of the bidirectional voltage source type power converter is connected with the second end of the first capacitor and the first end of the non-sensitive load;
the intelligent voltage stabilizer is connected in parallel on the power transmission line.
Optionally, the bidirectional voltage source power converter comprises: the bidirectional AC/DC converter, the bidirectional DC/DC converter, the control system, the second capacitor and the energy storage power supply;
the first end of the bidirectional AC/DC converter is connected with the first end of the inductor, and the second end of the bidirectional AC/DC converter is connected with the second end of the first capacitor and the first end of the insensitive load;
the bidirectional AC/DC converter, the bidirectional DC/DC converter and the energy storage power supply are sequentially connected in series, and the second capacitor is connected between the bidirectional AC/DC converter and the bidirectional DC/DC converter in parallel;
the control system is configured to: and controlling the bidirectional DC/DC converter and the bidirectional AC/DC control module to convert the voltage of the AC side during charging so that the converted direct-current voltage meets the requirement of charging the energy storage power supply, and converting the voltage of the energy storage power supply during discharging so that the energy storage power supply charges the power grid.
Optionally, the control system comprises: the bidirectional AC/DC control module, the bidirectional DC/DC control module and the main controller;
the bidirectional AC/DC control module is connected in parallel with the bidirectional AC/DC converter, and the bidirectional DC/DC control module is connected in parallel with the bidirectional DC/DC converter;
the bidirectional AC/DC control module is connected with the bidirectional DC/DC control module in series through the main controller;
the master controller is used for: coordinating operation between the bidirectional AC/DC control module and the bidirectional DC/DC control module.
Optionally, the energy storage power supply is: an energy storage DC power supply.
Optionally, the intelligent voltage stabilizer is connected in parallel with the sensitive load.
Optionally, the first capacitor and the inductor constitute a low-pass passive filter.
The second aspect of the present application provides a control method for an intelligent voltage stabilizing device of a power transmission line, which is applied to a power grid system formed by connecting the intelligent voltage stabilizing device provided by the first aspect in parallel to the power transmission line, and the method includes:
acquiring the measurement voltage of a common node of the power transmission line and the rated voltage of the power transmission line;
establishing a reference control voltage relational expression of the intelligent voltage stabilizer according to the measured voltage and the rated voltage based on a control block diagram of the intelligent voltage stabilizer;
setting a control error and a voltage amplitude modulation coefficient of the voltage relational expression, and calculating a reference control voltage of the intelligent voltage stabilizing device according to the reference control voltage relational expression;
and adding the reference control voltage into the corresponding intelligent voltage stabilizing device, so that each intelligent voltage stabilizing device works in a coordinated manner.
Optionally, the reference control voltage relation is:
vmx-emx＝vm *-MK+vmx-ref；
in the formula, vmxA measured voltage for a power line common node; e.g. of the typemxTo control errors; v. ofm *The rated voltage of the transmission line; m is a voltage amplitude modulation coefficient; k is a constant; v. ofmx-refIs a reference control voltage.
A third aspect of the present application provides a control apparatus for an intelligent voltage regulator of a power transmission line, the apparatus comprising a processor and a memory:
the memory is used for storing program codes and transmitting the program codes to the processor;
the processor is configured to execute the steps of the control method of the intelligent voltage stabilizing device of the power transmission line according to the instructions in the program code.
A fourth aspect of the present application provides a computer-readable storage medium for storing a program code for executing the method for controlling an intelligent voltage stabilizing apparatus of a power transmission line according to the second aspect.
The application provides transmission line's intelligent voltage regulator device includes: the bidirectional voltage source type power converter comprises a bidirectional voltage source type power converter, a non-sensitive load, a first capacitor and an inductor; the first end of the bidirectional voltage source type power converter is connected with the first end of the inductor, the second end of the inductor is connected with the first end of the first capacitor, and the second end of the first capacitor is connected with the first end of the non-sensitive load; the second end of the bidirectional voltage source type power converter is connected with the second end of the first capacitor and the first end of the non-sensitive load; the intelligent voltage stabilizer is connected in parallel on the power transmission line; and the intelligent voltage stabilizing devices are controlled by the improved control method, so that the intelligent voltage stabilizing devices work coordinately.
The utility model provides an intelligent voltage regulator of transmission line comprises two-way voltage source type power converter and non-sensitive load, need not the telecommunications assistance, and the device is small, and self cost and later maintenance cost are far less than large capacity electric energy storage equipment, and response speed is fast, but looks independent operation. Meanwhile, the power converter is a voltage source type power converter, and the energy storage unit in the power converter is utilized to enable the intelligent voltage stabilizing device to work in multiple modes, so that the reactive power and the active power of a power grid are compensated, the intelligent voltage stabilizing device can also serve as distributed energy storage equipment to buffer electric energy, the functions of voltage stabilization and energy storage can be achieved simultaneously, the voltage stabilization precision is high, and the low-pass passive filter formed by the first capacitor and the inductor can filter harmonic interference.
Furthermore, on the basis of the original intelligent voltage stabilizing controller, a new reference voltage is added, so that the voltage stabilizing device controls the voltage stabilizing device through an automatic reference voltage control method, a plurality of controllers on the same line can coordinate, the capacity resource allocation of the intelligent voltage stabilizing device is optimized, the cost is reduced, and a coordination control method is provided for large-scale distributed application of the intelligent voltage stabilizing device in a power grid; meanwhile, due to the coordinated and unified control of the automatic reference voltage of the intelligent voltage stabilizing devices, the non-sensitive loads in the intelligent voltage stabilizing devices can uniformly bear redundant load capacity (or uniform load shedding), so that the system can run more safely and stably. Therefore, the technical problems of large volume, high cost and incapability of coordinated work in the prior art are solved.
Drawings
Fig. 1 is a system architecture diagram of an intelligent voltage regulator for a power transmission line provided in an embodiment of the present application;
fig. 2 is a structural diagram of an intelligent voltage regulator for a power transmission line provided in an embodiment of the present application;
fig. 3 is a control block diagram of a control device of an intelligent voltage regulator for a power transmission line provided in an embodiment of the present application.
Detailed Description
The technical solutions of the present application will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
Referring to fig. 1, fig. 1 is a system architecture diagram of an intelligent voltage regulator for a power transmission line according to an embodiment of the present application.
The intelligent voltage regulator device of transmission line that this application embodiment provided includes: the bidirectional voltage source type power converter comprises a bidirectional voltage source type power converter, a non-sensitive load, a first capacitor and an inductor;
the first end of the bidirectional voltage source type power converter is connected with the first end of the inductor, the second end of the inductor is connected with the first end of the first capacitor, and the second end of the first capacitor is connected with the first end of the non-sensitive load; the second end of the bidirectional voltage source type power converter is connected with the second end of the first capacitor and the first end of the non-sensitive load; the intelligent voltage stabilizer is connected in parallel on the power transmission line.
Fig. 1 is a block diagram of a position of an intelligent voltage stabilizer in a power system including both an ac power source and new energy power generation. The intelligent voltage stabilizing device is formed by connecting a bidirectional voltage source type power converter and a load insensitive to voltage in series, remote communication assistance is not needed, the size of the device is small, the self cost and the later maintenance cost are far lower than those of large-capacity electric energy storage equipment, the response speed is high, and the device can be operated independently in a phase mode. The load sensitive to voltage variation is connected in parallel to the intelligent voltage stabilizer, wherein the main electrical quantities include a source impedance of an alternating current power supply, a line impedance of a power transmission line, and a voltage at a common node of a load end and a voltage on a non-sensitive load.
On a power transmission line, due to the existence of line impedance, at different distances from a power supply, the actual voltage of the power transmission line is not equal to the rated voltage of the power transmission line; meanwhile, due to the increase of the new energy grid-connected proportion of the power supply end and the existence of a large-scale nonlinear load at the load end, the voltage on the power transmission line can fluctuate within a certain range, the fluctuation of the voltage within a large range can seriously affect the stable operation of the whole power system, the intelligent voltage stabilizing device provided by the embodiment can automatically stabilize the voltage at different installation positions on the line, and meanwhile, the energy conversion between a power grid and the device can be realized by utilizing a bidirectional power converter.
Referring to fig. 2, fig. 2 is a structural diagram of an intelligent voltage regulator for a power transmission line according to an embodiment of the present disclosure.
Further, in an alternative embodiment, a bidirectional voltage source power converter includes: the bidirectional AC/DC converter, the bidirectional DC/DC converter, the control system, the second capacitor and the energy storage power supply;
the first end of the bidirectional AC/DC converter is connected with the first end of the inductor, and the second end of the bidirectional AC/DC converter is connected with the second end of the first capacitor and the first end of the insensitive load; the bidirectional AC/DC converter, the bidirectional DC/DC converter and the energy storage power supply are sequentially connected in series, and the second capacitor is connected between the bidirectional AC/DC converter and the bidirectional DC/DC converter in parallel; the control system is used for: the bidirectional DC/DC converter and the bidirectional AC/DC control module are controlled to convert the voltage of the AC side during charging, so that the converted direct-current voltage meets the requirement of charging the energy storage power supply, and the voltage of the energy storage power supply is converted during discharging, so that the energy storage power supply charges the power grid.
It should be noted that, in the power grid, the intelligent voltage stabilizer can be regarded as a distributed energy storage power supply and a controllable load, and the energy storage power supply at the direct current end adopts an energy storage direct current power supply, so that the system can work in multiple modes, and the exchange between active power and reactive power and the whole power grid can be realized at the same time; the bidirectional DC/DC converter is designed for protecting the energy storage battery, and during charging, the direct-current voltage rectified from the alternating-current end meets the voltage condition for charging the energy storage battery, so that the energy storage battery receives energy from a power grid; during discharging, the voltage output from the energy storage power supply end meets the inversion condition of the bidirectional inverter, so that energy is output to the power grid.
Further, in an optional embodiment, the control system comprises: the bidirectional AC/DC control module, the bidirectional DC/DC control module and the main controller;
the bidirectional AC/DC control module is connected in parallel with the bidirectional AC/DC converter, and the bidirectional DC/DC control module is connected in parallel with the bidirectional DC/DC converter; the bidirectional AC/DC control module is connected with the bidirectional DC/DC control module in series through the main controller; the master controller is used for: coordinating operation between the bidirectional AC/DC control module and the bidirectional DC/DC control module.
It should be noted that the bidirectional AC/DC control module and the bidirectional DC/DC control module of this embodiment are coordinately controlled by the same main controller. The control system has the characteristics that the voltage of the power grid can be stabilized at a given reference value without being interfered by external disturbance, and meanwhile, the existence of the direct-current energy storage power supply can also output active power to the power grid.
Further, in an optional implementation manner, the intelligent voltage stabilizing device of the embodiment is connected in parallel with the sensitive load. As shown in fig. 1.
Further, the first capacitor and the inductor constitute a low-pass passive filter. It should be noted that, in the present application, the basic circuit of the intelligent voltage stabilizer employs LC low-pass passive filtering, which can filter the interference of low-order harmonics.
The above is an embodiment of the intelligent voltage stabilizing device for the power transmission line provided in the embodiment of the present application, and the above is an embodiment of a control method of the intelligent voltage stabilizing device for the power transmission line provided in the embodiment of the present application.
Referring to fig. 3, fig. 3 is a control block diagram of a control device of an intelligent voltage regulator of a power transmission line according to an embodiment of the present application.
It should be noted that, in the conventional single-regulator controller design, the difference between the voltage at the off-supply terminal X and the (i.e. the rated line voltage) is directly made to form an error e, however, when a plurality of regulator controllers are simultaneously designed at different positions on a line, this method is not preferable, because the controllers can work independently without coordination, power and load are not distributed uniformly among the controllers, and resources are wasted, for example, on one line, one controller generates voltage support, the other controller generates voltage suppression, the two controllers work independently, this case can stably operate even when the capacity of the intelligent voltage stabilizer is sufficient, however, in actual operation, the capacity of the intelligent voltage stabilizer is limited due to cost reduction, and the stable operation of the working mode is influenced; therefore, the controllers need to be coordinated and uniformly controlled to cooperate with each other to exert a common force to balance active power and reactive power on a line, so that the capacity of each device can be fully utilized, and the load distribution on the non-sensitive load can be more uniform.
The control method of the application adds a new reference voltage v on the basis of the original intelligent voltage stabilizing controllermx-refAs shown in fig. 3, the reference voltage is a variable that varies depending on the installation position of the intelligent voltage stabilizer, and the relationship thereof is expressed by a reference control voltage relational expression. In the controller, vmxFor the measured voltage of the actual line common node, v* mRated for the line voltage, vmx-refFor the regulated common node reference voltage, the new error e is obtainedmxAfter the PI control loop, M (a result of proportional and integral operation on an error) is obtained and can be regarded as a modulation coefficient for adjusting the voltage amplitude in a pulse width modulation system, the positive polarity and the negative polarity of M represent the reactive characteristic of output power, and the value obtained by multiplying the modulation coefficient by a constant K is differentiated from the rated voltage of the line to obtain new reference control voltage at different intelligent voltage stabilizing device installation positions on the line.
Therefore, the present application provides the following control method of the intelligent voltage stabilizing apparatus.
The control method for the intelligent voltage stabilizing device of the power transmission line provided by the embodiment of the application is applied to a power grid system formed by connecting the intelligent voltage stabilizing device of any power transmission line in parallel with the power transmission line in the device embodiment, and comprises the following steps:
step 101, obtaining the measurement voltage of the common node of the transmission line and the rated voltage of the transmission line.
And 102, establishing a reference control voltage relational expression of the intelligent voltage stabilizer according to the measured voltage and the rated voltage based on a control block diagram of the intelligent voltage stabilizer.
Wherein, the reference control voltage relation is as follows:
vmx-emx＝vm *-MK+vmx-ref；
in the formula, vmxA measured voltage for a power line common node; e.g. of the typemxTo control errors; v. ofm *The rated voltage of the transmission line; m is a voltage amplitude modulation coefficient; k is a constant; v. ofmx-refIs a reference control voltage.
And 103, setting a control error and a voltage amplitude modulation coefficient of the voltage relational expression, and calculating the reference control voltage of the intelligent voltage stabilizer according to the reference control voltage relational expression.
And 104, adding the reference control voltage into the corresponding intelligent voltage stabilizing devices to enable the intelligent voltage stabilizing devices to work in a coordinated mode.
According to the control method of the intelligent voltage stabilizing device of the power transmission line, a new reference voltage is added on the basis of an original intelligent voltage stabilizing controller, so that the voltage stabilizing device is controlled by an automatic reference voltage control method, a plurality of controllers on the same line can coordinate, capacity resource allocation of the intelligent voltage stabilizing device is optimized, cost is reduced, and a coordination control method is provided for large-scale distributed application of the intelligent voltage stabilizing device in a power grid; meanwhile, due to the coordinated and unified control of the automatic reference voltage of the intelligent voltage stabilizing devices, the non-sensitive loads in the intelligent voltage stabilizing devices can uniformly bear redundant load capacity (or uniform load shedding), so that the system can run more safely and stably. Therefore, the technical problems of large volume, high cost and incapability of coordinated work in the prior art are solved.
Further, the present application also provides a control device of an intelligent voltage stabilization device of a power transmission line, which is characterized in that the device includes a processor and a memory:
the memory is used for storing program codes and transmitting the program codes to the processor;
the processor is used for executing the control method of the intelligent voltage stabilizing device of the power transmission line according to the instructions in the program codes.
Further, the present application also provides a computer-readable storage medium, wherein the computer-readable storage medium is used for storing a program code, and the program code is used for executing the control method of the intelligent voltage stabilizing apparatus for the power transmission line described above.
It should be understood that in the present application, "at least one" means one or more, "a plurality" means two or more. "and/or" for describing an association relationship of associated objects, indicating that there may be three relationships, e.g., "a and/or B" may indicate: only A, only B and both A and B are present, wherein A and B may be singular or plural. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship. "at least one of the following" or similar expressions refer to any combination of these items, including any combination of single item(s) or plural items. For example, at least one (one) of a, b, or c, may represent: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", wherein a, b, c may be single or plural.
Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.
Claims (10)
1. The utility model provides an intelligent voltage regulator device of transmission line which characterized in that includes: the bidirectional voltage source type power converter comprises a bidirectional voltage source type power converter, a non-sensitive load, a first capacitor and an inductor;
the first end of the bidirectional voltage source type power converter is connected with the first end of the inductor, the second end of the inductor is connected with the first end of the first capacitor, and the second end of the first capacitor is connected with the first end of the non-sensitive load;
the second end of the bidirectional voltage source type power converter is connected with the second end of the first capacitor and the first end of the non-sensitive load;
the intelligent voltage stabilizer is connected in parallel on the power transmission line.
2. The intelligent voltage stabilizer for transmission line of claim 1, wherein said bidirectional voltage source type power converter comprises: the bidirectional AC/DC converter, the bidirectional DC/DC converter, the control system, the second capacitor and the energy storage power supply;
the first end of the bidirectional AC/DC converter is connected with the first end of the inductor, and the second end of the bidirectional AC/DC converter is connected with the second end of the first capacitor and the first end of the insensitive load;
the bidirectional AC/DC converter, the bidirectional DC/DC converter and the energy storage power supply are sequentially connected in series, and the second capacitor is connected between the bidirectional AC/DC converter and the bidirectional DC/DC converter in parallel;
the control system is configured to: and controlling the bidirectional DC/DC converter and the bidirectional AC/DC control module to convert the voltage of the AC side during charging so that the converted direct-current voltage meets the requirement of charging the energy storage power supply, and converting the voltage of the energy storage power supply during discharging so that the energy storage power supply charges the power grid.
3. The intelligent voltage stabilizer for transmission line according to claim 2, wherein said control system comprises: the bidirectional AC/DC control module, the bidirectional DC/DC control module and the main controller;
the bidirectional AC/DC control module is connected in parallel with the bidirectional AC/DC converter, and the bidirectional DC/DC control module is connected in parallel with the bidirectional DC/DC converter;
the bidirectional AC/DC control module is connected with the bidirectional DC/DC control module in series through the main controller;
the master controller is used for: coordinating operation between the bidirectional AC/DC control module and the bidirectional DC/DC control module.
4. The intelligent voltage stabilizer for transmission lines of claim 2, wherein the energy storage power supply is: an energy storage DC power supply.
5. The intelligent voltage stabilizer for power transmission lines of claim 1, characterized in that the intelligent voltage stabilizer is connected in parallel with a sensitive load.
6. The intelligent voltage regulator of power transmission line of claim 1, wherein said first capacitor and said inductor constitute a low-pass passive filter.
7. A control method of intelligent voltage stabilizer of transmission line is applied to a power grid system formed by connecting the intelligent voltage stabilizer of any one of the transmission lines in parallel with the transmission line, and is characterized in that,
acquiring the measurement voltage of a common node of the power transmission line and the rated voltage of the power transmission line;
establishing a reference control voltage relational expression of the intelligent voltage stabilizer according to the measured voltage and the rated voltage based on a control block diagram of the intelligent voltage stabilizer;
setting a control error and a voltage amplitude modulation coefficient of the voltage relational expression, and calculating a reference control voltage of the intelligent voltage stabilizing device according to the reference control voltage relational expression;
and adding the reference control voltage into the corresponding intelligent voltage stabilizing device, so that each intelligent voltage stabilizing device works in a coordinated manner.
8. The control method of the intelligent voltage stabilizing device of the power transmission line according to claim 5, wherein the reference control voltage relation is as follows:
vmx-emx＝vm *-MK+vmx-ref；
in the formula, vmxA measured voltage for a power line common node; e.g. of the typemxTo control errors; v. ofm *The rated voltage of the transmission line; m is a voltage amplitude modulation coefficient; k is a constant; v. ofmx-refIs a reference control voltage.
9. A control device of an intelligent voltage stabilizer of a power transmission line, characterized in that the device comprises a processor and a memory:
the memory is used for storing program codes and transmitting the program codes to the processor;
the processor is used for executing the control method of the intelligent voltage stabilizing device of the power transmission line according to any one of claims 6 to 7 according to instructions in the program code.
10. A computer-readable storage medium for storing a program code for executing the method for controlling an intelligent voltage stabilizing apparatus of a power transmission line according to any one of claims 6 to 7.
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