CN117060457B - Energy storage system intelligent control system based on hybrid inverter - Google Patents
Energy storage system intelligent control system based on hybrid inverter Download PDFInfo
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- 238000004364 calculation method Methods 0.000 claims description 66
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- 238000006243 chemical reaction Methods 0.000 claims description 15
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Classifications
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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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
Abstract
The invention provides an intelligent control system of an energy storage system based on a hybrid inverter, which comprises a hybrid inverter terminal, an energy storage terminal, a power grid state detection terminal, a load state detection terminal and an intelligent control terminal; the hybrid inversion terminal is used for converting input direct-current energy into alternating-current energy, and storing the alternating-current energy in the energy storage terminal or releasing the alternating-current energy in a power grid and a load; the energy storage terminal is used for receiving the alternating-current energy from the hybrid inversion terminal and converting the alternating-current energy into chemical energy for storage; the power grid state detection terminal is used for detecting the state of the power grid and acquiring power grid state information; the load state detection terminal is used for carrying out state detection on the load and acquiring load state information; the intelligent control terminal is used for generating corresponding inversion control information according to the power grid state information and the load state information; the hybrid inversion terminal is used for selecting a corresponding inversion mode to work according to the inversion control information. The invention has the effect of improving the working stability of the energy storage system.
Description
Technical Field
The invention relates to the technical field of energy storage control systems, in particular to an intelligent control system of an energy storage system based on a hybrid inverter.
Background
Hybrid inverters are a type of power electronics device that converts direct current electrical energy to alternating current electrical energy while also enabling other functions, such as energy storage, grid interconnection, and power management. The hybrid inverter is widely used in renewable energy systems and micro-grid systems, and can realize efficient utilization and intelligent control of energy. An intelligent control system for an energy storage system is an automated system for managing and controlling energy storage devices. The method aims at optimizing the storage, release and distribution of energy through intelligent algorithms and strategies so as to improve the efficiency, reliability and service life of the energy storage system to the greatest extent.
Many intelligent control systems for energy storage systems have been developed, and through extensive searching and reference, the intelligent control systems for energy storage systems in the prior art are known as the intelligent control systems for energy storage systems disclosed in publication nos. CN110649710A, CN114552739A, CN116544936A, EP3865335A1, US20210245607A1 and JP2016000995a, and generally include: the system comprises an inversion terminal, an energy storage terminal, an analysis terminal and a control terminal; the inversion terminal is used for converting direct-current energy of the energy storage terminal into alternating-current energy, and the analysis terminal is used for analyzing according to the energy storage condition of the energy storage system; and the control terminal is used for carrying out energy storage and output control according to the analysis result. The inversion mode and the control mode of the intelligent control system of the energy storage system are single, so that the energy storage system has larger working risk in the working process, and the defect of reduced working stability of the energy storage system is caused.
Disclosure of Invention
The invention aims to provide an intelligent control system of an energy storage system based on a hybrid inverter aiming at the defects of the intelligent control system of the energy storage system.
The invention adopts the following technical scheme:
an intelligent control system of an energy storage system based on a hybrid inverter comprises a hybrid inverter terminal, an energy storage terminal, a power grid state detection terminal, a load state detection terminal and an intelligent control terminal; the hybrid inversion terminal is used for converting input direct-current energy into alternating-current energy, and storing the alternating-current energy in the energy storage terminal or releasing the alternating-current energy in a power grid and a load; the energy storage terminal is used for receiving alternating-current energy from the hybrid inversion terminal and converting the alternating-current energy into chemical energy for storage; the power grid state detection terminal is used for detecting the state of a power grid and acquiring power grid state information; the load state detection terminal is used for detecting the state of the load and acquiring load state information; the intelligent control terminal is used for generating corresponding inversion control information according to the power grid state information and the load state information; the hybrid inversion terminal is used for selecting a corresponding inversion mode to work according to the inversion control information;
the hybrid inversion terminal comprises a PWM inversion module, a multi-level inversion module and a mode selection module; the mode selection module is used for receiving and executing corresponding inversion control information; the PWM inversion module is used for converting direct current energy into high-frequency pulses, modulating the width of the high-frequency pulses and generating corresponding alternating current energy; the multi-level inversion module is used for converting direct-current energy into alternating-current energy and reducing harmonic content of output voltage by introducing a plurality of levels into the output voltage;
the intelligent control terminal comprises a state index calculation module and an inversion control information generation module; the state index calculation module is used for calculating a state index at a corresponding moment according to the power grid state information and the load state information; the inversion control information generation module is used for generating corresponding inversion control information according to the state indexes at the corresponding moments.
Optionally, the intelligent control terminal further comprises a security scoring module and a control start-stop module; the safety scoring module is used for calculating safety scores according to the working voltage, the working temperature and the load quantity of each device of the system; the control start-stop module is used for generating corresponding control start-stop information according to the security score; the control start-stop information is used for driving the state index calculation module to keep working or stop working.
Optionally, the safety scoring module comprises a system parameter safety score computing sub-module, an environment parameter safety score computing sub-module, a load parameter safety score computing sub-module and a score summarizing sub-module; the system parameter safety score calculating submodule is used for calculating the system parameter safety score according to the working voltage and the working temperature of each device of the system; the environment parameter safety score calculating submodule is used for calculating the environment parameter safety score according to the temperature, the humidity and the maintenance worker working condition of the environment where the system is located; the load parameter safety score calculation submodule is used for calculating corresponding load parameter safety scores according to the total load number and the load type of system access; the scoring summarizing submodule is used for summarizing the system parameter safety score, the environment parameter safety score and the load parameter safety score to generate a corresponding safety score;
when the system parameter safety score calculation submodule calculates, the following formula is satisfied:
；
wherein,representing a system parameter security score; />And->Respectively representing a first weight coefficient and a second weight coefficient, which are set by an administrator according to experience; />An operating temperature value indicating the highest operating temperature of all the devices of the system; />Representing the highest reference temperature value; />Representing the +.>The operating voltage values of the individual devices; />Representing the +.>The operating reference voltage values of the individual devices; />Representing the total number of devices of the system;
when the environment parameter safety score calculation submodule calculates, the following formula is satisfied:
；
wherein,representing an environmental parameter security score; />、/>And->Respectively representing different conversion coefficients, which are set by an administrator according to experience; />A humidity value representing the environment in which the system is located; />A temperature value representing the environment in which the system is located; />Representing the average work age of all maintenance workers in the environment where the system is located; />Representing the average maintenance project number of all maintenance workers in the environment of the system; />Indicating +.>Worker grades of individual maintenance workers; the worker grade is preset by an administrator according to the capability and the working age of workers; />Representing the total number of all maintenance workers;
when the load parameter safety score calculation submodule calculates, the following equation is satisfied:
；
wherein,representing a load parameter safety score; />Representing conversion coefficients, empirically set by an administrator; />The type number of the system access load is represented; />Representing the total number of system access loads;
when the score summary sub-module works, the following equation is satisfied:
；
wherein,representing a security score; when->When the state index calculation module is started, the control start-stop module generates control start-stop information for driving the state index calculation module to stop working; when->When the state index calculation module is started, the control start-stop module generates control start-stop information for driving the state index calculation module to keep working; />The start-stop determination threshold is empirically set by an administrator.
Optionally, the state index calculation module comprises an information data extraction sub-module and a state index calculation sub-module; the information data extraction submodule is used for extracting state index calculation data of power grid state information and load state information; the state index calculation data comprise power grid voltage, power grid fault frequency, power grid access user number, load power and load average operation duration; the state index calculation sub-module is used for calculating the state index according to the state index calculation data;
when the state index calculation sub-module calculates, the following equation is satisfied:
；
；
；
wherein,a state index representing the system; />Representing grid instability scores; />Representing a load instability score;and->Respectively representing a voltage difference conversion coefficient and a fault frequency difference conversion coefficient, which are set by an administrator according to experience; />Representing the average grid voltage of the power grid in a preset period; the preset period is defined byThe administrator sets according to experience; />Representing a reference grid voltage; />Representing the power grid fault frequency in a preset period; />Representing a reference grid fault frequency; />、/>And->Respectively representing different grading conversion coefficients, which are set by an administrator according to experience; />Representing a maximum load operating power value; />Indicating the total operating power of the system that has been connected to the load; />A working average duration value of the accessed load of the system is represented;
when (when)The inversion control information generation module generates inversion control information for representing the use of a PWM inversion mode; when->When the inversion control information generation module generates inversion control information for representing the use of a multilevel inversion mode; />The inversion mode switching threshold is set empirically by an administrator.
An intelligent control method of an energy storage system based on a hybrid inverter is applied to the intelligent control system of the energy storage system based on the hybrid inverter, and the intelligent control method of the energy storage system comprises the following steps:
s1, converting input direct-current energy into alternating-current energy, and storing the alternating-current energy in an energy storage terminal or releasing the alternating-current energy in a power grid and a load;
s2, receiving alternating-current energy from the hybrid inversion terminal and converting the alternating-current energy into chemical energy for storage;
s3, detecting the state of the power grid to obtain power grid state information;
s4, detecting the state of the load to obtain load state information;
s5, generating corresponding inversion control information according to the power grid state information and the load state information;
s6, selecting a corresponding inversion mode to work according to the inversion control information.
The beneficial effects obtained by the invention are as follows:
1. the arrangement of the hybrid inversion terminal, the energy storage terminal, the power grid state detection terminal, the load state detection terminal and the intelligent control terminal is beneficial to increasing inversion modes in a hybrid inversion mode, and enriching control modes in a power grid state detection and load state detection mode, so that intelligent control of the energy storage system is more accurate, and the stability of the working process of the energy storage system is improved;
2. the arrangement of the PWM inversion module, the multi-level inversion module and the mode selection module is beneficial to improving the stability of the inversion process in a selection mode of PWM inversion and multi-level inversion, and improving the accuracy of inversion mode selection in the mode selection module, so that the stability of the working process of the energy storage system is further improved;
3. the state index calculation module and the inversion control information generation module are arranged to be beneficial to improving the accuracy of the corresponding inversion control information by calculating the state index, so that the accuracy and the stability of intelligent control are improved, and the stability of the working process of the energy storage system is improved;
4. the safety scoring module and the control start-stop module are arranged to be beneficial to taking the safety score calculated in real time as a monitoring result, so that the accuracy and timeliness of control start-stop information are improved, the risk of faults of each device in the system is reduced, the system stability is improved, and the stability of the working process of the energy storage system is improved;
5. the system parameter safety score calculation sub-module, the environment parameter safety score calculation sub-module, the load parameter safety score calculation sub-module and the score summarization sub-module are arranged in combination with the system parameter safety score algorithm, the environment parameter safety score algorithm, the load parameter safety score algorithm and the safety score algorithm, so that the accuracy of safety score is improved, the accuracy of control start-stop information is further improved, and the stability of the working process of the energy storage system is further improved;
6. the information data extraction sub-module and the state index calculation sub-module are matched with a state index algorithm, so that the accuracy of the state index is improved, the accuracy of inversion control information is improved, and the stability of the working process of the energy storage system is greatly improved;
7. the preset period correction unit and the state index calculation unit are matched with a preset period duration correction algorithm, so that accuracy and adaptability of the preset period duration are improved, and accuracy of the state index and stability of the working process of the energy storage system are improved.
For a further understanding of the nature and the technical aspects of the present invention, reference should be made to the following detailed description of the invention and the accompanying drawings, which are provided for purposes of reference only and are not intended to limit the invention.
Drawings
FIG. 1 is a schematic diagram of the overall structure of the present invention;
FIG. 2 is a schematic diagram of a security scoring module according to the present invention;
FIG. 3 is a schematic diagram of a state index calculation module according to the present invention;
FIG. 4 is a schematic flow chart of a method for intelligent control of an energy storage system based on a hybrid inverter according to the present invention;
fig. 5 is a schematic structural diagram of a state index calculation submodule in the present invention.
Detailed Description
The following embodiments of the present invention are described in terms of specific examples, and those skilled in the art will appreciate the advantages and effects of the present invention from the disclosure herein. The invention is capable of other and different embodiments and its several details are capable of modification and variation in various respects, all without departing from the spirit of the present invention. The drawings of the present invention are merely schematic illustrations, and are not drawn to actual dimensions, and are stated in advance. The following embodiments will further illustrate the related art of the present invention in detail, but the disclosure is not intended to limit the scope of the present invention.
Embodiment one: the embodiment provides an intelligent control system of an energy storage system based on a hybrid inverter. Referring to fig. 1, an intelligent control system of an energy storage system based on a hybrid inverter includes a hybrid inverter terminal, an energy storage terminal, a power grid state detection terminal, a load state detection terminal and an intelligent control terminal; the hybrid inversion terminal is used for converting input direct-current energy into alternating-current energy, and storing the alternating-current energy in the energy storage terminal or releasing the alternating-current energy in a power grid and a load; the energy storage terminal is used for receiving alternating-current energy from the hybrid inversion terminal and converting the alternating-current energy into chemical energy for storage; the power grid state detection terminal is used for detecting the state of a power grid and acquiring power grid state information; the load state detection terminal is used for detecting the state of the load and acquiring load state information; the intelligent control terminal is used for generating corresponding inversion control information according to the power grid state information and the load state information; the hybrid inversion terminal is used for selecting a corresponding inversion mode to work according to the inversion control information;
the hybrid inversion terminal comprises a PWM inversion module, a multi-level inversion module and a mode selection module; the mode selection module is used for receiving and executing corresponding inversion control information; the PWM inversion module is used for converting direct current energy into high-frequency pulses, modulating the width of the high-frequency pulses and generating corresponding alternating current energy; the multi-level inversion module is used for converting direct-current energy into alternating-current energy and reducing harmonic content of output voltage by introducing a plurality of levels into the output voltage;
the intelligent control terminal comprises a state index calculation module and an inversion control information generation module; the state index calculation module is used for calculating a state index at a corresponding moment according to the power grid state information and the load state information; the inversion control information generation module is used for generating corresponding inversion control information according to the state indexes at the corresponding moments.
Optionally, the intelligent control terminal further comprises a security scoring module and a control start-stop module; the safety scoring module is used for calculating safety scores according to the working voltage, the working temperature and the load quantity of each device of the system; the control start-stop module is used for generating corresponding control start-stop information according to the security score; the control start-stop information is used for driving the state index calculation module to keep working or stop working.
Optionally, referring to fig. 2, the security scoring module includes a system parameter security score computing sub-module, an environment parameter security score computing sub-module, a load parameter security score computing sub-module, and a score summarizing sub-module; the system parameter safety score calculating submodule is used for calculating the system parameter safety score according to the working voltage and the working temperature of each device of the system; the environment parameter safety score calculating submodule is used for calculating the environment parameter safety score according to the temperature, the humidity and the maintenance worker working condition of the environment where the system is located; the load parameter safety score calculation submodule is used for calculating corresponding load parameter safety scores according to the total load number and the load type of system access; the scoring summarizing submodule is used for summarizing the system parameter safety score, the environment parameter safety score and the load parameter safety score to generate a corresponding safety score;
when the system parameter safety score calculation submodule calculates, the following formula is satisfied:
；
wherein,representing a system parameter security score; />And->Respectively representing a first weight coefficient and a second weight coefficient, which are set by an administrator according to experience; />An operating temperature value indicating the highest operating temperature of all the devices of the system; />Representing the highest reference temperature value; />Representing the +.>The operating voltage values of the individual devices; />Representing the +.>The operating reference voltage values of the individual devices; />Representing the total number of devices of the system;
when the environment parameter safety score calculation submodule calculates, the following formula is satisfied:
；
wherein,representing an environmental parameter security score; />、/>And->Respectively representing different conversion coefficients, which are set by an administrator according to experience; />A humidity value representing the environment in which the system is located; />A temperature value representing the environment in which the system is located; />Representing the average work age of all maintenance workers in the environment where the system is located; />Representing the average maintenance project number of all maintenance workers in the environment of the system; />Indicating +.>Worker grades of individual maintenance workers; the worker grade is preset by an administrator according to the capability and the working age of workers; />Representing the total number of all maintenance workers;
when the load parameter safety score calculation submodule calculates, the following equation is satisfied:
；
wherein,representing a load parameter safety score; />Representing conversion coefficients, empirically set by an administrator; />The type number of the system access load is represented; />Representing the total number of system access loads;
when the score summary sub-module works, the following equation is satisfied:
；
wherein,representing a security score; when->When the state index calculation module is started, the control start-stop module generates control start-stop information for driving the state index calculation module to stop working; when->When the state index calculation module is started, the control start-stop module generates control start-stop information for driving the state index calculation module to keep working; />The start-stop determination threshold is empirically set by an administrator.
Optionally, as shown in fig. 3, the state index calculation module includes an information data extraction sub-module and a state index calculation sub-module; the information data extraction submodule is used for extracting state index calculation data of power grid state information and load state information; the state index calculation data comprise power grid voltage, power grid fault frequency, power grid access user number, load power and load average operation duration; the state index calculation sub-module is used for calculating the state index according to the state index calculation data;
when the state index calculation sub-module calculates, the following equation is satisfied:
；
；
；
wherein,a state index representing the system; />Representing grid instability scores; />Representing a load instability score;and->Respectively representing a voltage difference conversion coefficient and a fault frequency difference conversion coefficient, which are set by an administrator according to experience; />Representing the average grid voltage of the power grid in a preset period; the preset period is set by an administrator according to experience；/>Representing a reference grid voltage; />Representing the power grid fault frequency in a preset period; />Representing a reference grid fault frequency; />、/>And->Respectively representing different grading conversion coefficients, which are set by an administrator according to experience; />Representing a maximum load operating power value; />Indicating the total operating power of the system that has been connected to the load; />A working average duration value of the accessed load of the system is represented;
when (when)The inversion control information generation module generates inversion control information for representing the use of a PWM inversion mode; when->When the inversion control information generation module generates inversion control information for representing the use of a multilevel inversion mode; />Representing the inverseThe mode switching threshold is empirically set by an administrator.
An intelligent control method of an energy storage system based on a hybrid inverter is applied to the intelligent control system of an energy storage system based on a hybrid inverter, and is shown in combination with fig. 4, and the intelligent control method of an energy storage system comprises the following steps:
s1, converting input direct-current energy into alternating-current energy, and storing the alternating-current energy in an energy storage terminal or releasing the alternating-current energy in a power grid and a load;
s2, receiving alternating-current energy from the hybrid inversion terminal and converting the alternating-current energy into chemical energy for storage;
s3, detecting the state of the power grid to obtain power grid state information;
s4, detecting the state of the load to obtain load state information;
s5, generating corresponding inversion control information according to the power grid state information and the load state information;
s6, selecting a corresponding inversion mode to work according to the inversion control information.
Embodiment two: the embodiment includes the whole content of the first embodiment, and provides an intelligent control system of an energy storage system based on a hybrid inverter, and referring to fig. 5, the state index calculation submodule includes a preset period checking unit and a state index calculation unit; the preset period correction unit is used for correcting the preset period according to the preset period input by the administrator and the system working condition; the state index calculation unit is used for calculating the state index according to the checked preset period and state index calculation data.
When the preset period checking unit works, the following formula is satisfied:
；
；
；
wherein,representing the preset period duration after the calibration; />Representing a preset period duration before collation; />Representing a periodic collation function; />Representing a collation index; />Representing a calibration reference time length value, which is empirically set by an administrator; />Representing an exponential transformation coefficient, empirically set by an administrator; />Representing the longest mode switching interval time value in one month on the system; />Indicating +.o within one month on the system>The number of inversion mode switching times in the day; />Indicating the number of days of the last month;to->Respectively represent different selection threshold values, which are set by an administrator according to experience。
The foregoing disclosure is only a preferred embodiment of the present invention and is not intended to limit the scope of the invention, so that all equivalent technical changes made by the application of the present invention and the accompanying drawings are included in the scope of the invention, and in addition, the elements in the invention can be updated with the technical development.
Claims (3)
1. The intelligent control system of the energy storage system based on the hybrid inverter is characterized by comprising a hybrid inverter terminal, an energy storage terminal, a power grid state detection terminal, a load state detection terminal and an intelligent control terminal; the hybrid inversion terminal is used for converting input direct-current energy into alternating-current energy, and storing the alternating-current energy in the energy storage terminal or releasing the alternating-current energy in a power grid and a load; the energy storage terminal is used for receiving alternating-current energy from the hybrid inversion terminal and converting the alternating-current energy into chemical energy for storage; the power grid state detection terminal is used for detecting the state of a power grid and acquiring power grid state information; the load state detection terminal is used for detecting the state of the load and acquiring load state information; the intelligent control terminal is used for generating corresponding inversion control information according to the power grid state information and the load state information; the hybrid inversion terminal is used for selecting a corresponding inversion mode to work according to the inversion control information;
the hybrid inversion terminal comprises a PWM inversion module, a multi-level inversion module and a mode selection module; the mode selection module is used for receiving and executing corresponding inversion control information; the PWM inversion module is used for converting direct current energy into high-frequency pulses, modulating the width of the high-frequency pulses and generating corresponding alternating current energy; the multi-level inversion module is used for converting direct-current energy into alternating-current energy and reducing harmonic content of output voltage by introducing a plurality of levels into the output voltage;
the intelligent control terminal comprises a state index calculation module and an inversion control information generation module; the state index calculation module is used for calculating a state index at a corresponding moment according to the power grid state information and the load state information; the inversion control information generation module is used for generating corresponding inversion control information according to the state indexes at the corresponding moments;
the intelligent control terminal also comprises a safety scoring module and a control start-stop module; the safety scoring module is used for calculating safety scores according to the working voltage, the working temperature and the load quantity of each device of the system; the control start-stop module is used for generating corresponding control start-stop information according to the security score; the control start-stop information is used for driving the state index calculation module to keep working or stop working;
the safety scoring module comprises a system parameter safety score computing sub-module, an environment parameter safety score computing sub-module, a load parameter safety score computing sub-module and a score summarizing sub-module; the system parameter safety score calculating submodule is used for calculating the system parameter safety score according to the working voltage and the working temperature of each device of the system; the environment parameter safety score calculating submodule is used for calculating the environment parameter safety score according to the temperature, the humidity and the maintenance worker working condition of the environment where the system is located; the load parameter safety score calculation submodule is used for calculating corresponding load parameter safety scores according to the total load number and the load type of system access; the scoring summarizing submodule is used for summarizing the system parameter safety score, the environment parameter safety score and the load parameter safety score to generate a corresponding safety score;
when the system parameter safety score calculation submodule calculates, the following formula is satisfied:
；
wherein,representing a system parameter security score; />And->Respectively representing a first weight coefficient and a second weight coefficient;an operating temperature value indicating the highest operating temperature of all the devices of the system; />Representing the highest reference temperature value; />Representing the +.>The operating voltage values of the individual devices; />Representing the +.>The operating reference voltage values of the individual devices; />Representing the total number of devices of the system;
when the environment parameter safety score calculation submodule calculates, the following formula is satisfied:
；
wherein,representing an environmental parameter security score; />、/>And->Respectively representing different conversion coefficients; />A humidity value representing the environment in which the system is located; />A temperature value representing the environment in which the system is located; />Representing the average work age of all maintenance workers in the environment where the system is located; />Representing the average maintenance project number of all maintenance workers in the environment of the system; />Indicating +.>Worker grades of individual maintenance workers; />Representing the total number of all maintenance workers;
when the load parameter safety score calculation submodule calculates, the following equation is satisfied:
；
wherein,representing a load parameter safety score; />Representing the conversion coefficient; />The type number of the system access load is represented;representing the total number of system access loads;
when the score summary sub-module works, the following equation is satisfied:
；
wherein,representing a security score; when->When the state index calculation module is started, the control start-stop module generates control start-stop information for driving the state index calculation module to stop working; when->When the state index calculation module is started, the control start-stop module generates control start-stop information for driving the state index calculation module to keep working; />Indicating a start-stop decision threshold.
2. The hybrid inverter-based energy storage system intelligent control system of claim 1, wherein the state index calculation module comprises an information data extraction sub-module and a state index calculation sub-module; the information data extraction submodule is used for extracting state index calculation data of power grid state information and load state information; the state index calculation data comprise power grid voltage, power grid fault frequency, power grid access user number, load power and load average operation duration; the state index calculation sub-module is used for calculating the state index according to the state index calculation data;
when the state index calculation sub-module calculates, the following equation is satisfied:
；
；
；
wherein,a state index representing the system; />Representing grid instability scores; />Representing a load instability score; />Andrespectively representing a voltage difference conversion coefficient and a fault frequency difference conversion coefficient; />Representing the average grid voltage of the power grid in a preset period; the preset period is set by an administrator according to experience; />Representing a reference grid voltage; />Representing the power grid fault frequency in a preset period; />Representing a reference grid fault frequency; />、/>And->Respectively representing different grading conversion coefficients;representing a maximum load operating power value; />Indicating the total operating power of the system that has been connected to the load; />A working average duration value of the accessed load of the system is represented;
when (when)The inversion control information generation module generates inversion control information for representing the use of a PWM inversion mode; when->When the inversion control information generation module generates inversion control information for representing the use of a multilevel inversion mode; />Representing the inversion mode switching threshold.
3. An intelligent control method of an energy storage system based on a hybrid inverter, which is applied to the intelligent control system of the energy storage system based on the hybrid inverter as claimed in claim 2, is characterized in that the intelligent control method of the energy storage system comprises the following steps:
s1, converting input direct-current energy into alternating-current energy, and storing the alternating-current energy in an energy storage terminal or releasing the alternating-current energy in a power grid and a load;
s2, receiving alternating-current energy from the hybrid inversion terminal and converting the alternating-current energy into chemical energy for storage;
s3, detecting the state of the power grid to obtain power grid state information;
s4, detecting the state of the load to obtain load state information;
s5, generating corresponding inversion control information according to the power grid state information and the load state information;
s6, selecting a corresponding inversion mode to work according to the inversion control information.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311317115.9A CN117060457B (en) | 2023-10-12 | 2023-10-12 | Energy storage system intelligent control system based on hybrid inverter |
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