CN-121769977-B - Energy storage system electric energy regulation and control method and system based on photovoltaic power station

CN121769977BCN 121769977 BCN121769977 BCN 121769977BCN-121769977-B

Abstract

The invention relates to the technical field of electric energy regulation, in particular to an energy storage system electric energy regulation method and an energy storage system electric energy regulation system based on a photovoltaic power station. According to the invention, the continuous change direction of the photovoltaic output power and the dynamic trend of the energy storage state of charge are periodically analyzed, a bidirectional trend matching logic is constructed, a key response period is extracted, a mapping relation between the period and an operation instruction is established on the basis, feedback is performed by combining a command to form a closed-loop identification result, synchronous tracking of photovoltaic output fluctuation and the evolution trend of the state of charge is realized, the adaptability of an energy storage system to the electric energy flowing state is enhanced, the accuracy and timeliness of a regulation strategy are improved, the response behavior and the energy distribution strategy of the energy storage equipment in a complex running state are optimized, and the running stability and the regulation efficiency of the energy storage system of the photovoltaic power station are ensured.

Inventors

DAI YUXING
WANG JUN
Ke Zipeng
ZHENG ZIJIE

Assignees

湖南大学

Dates

Publication Date: 20260508
Application Date: 20260304

Claims (10)

1. The energy storage system electric energy regulation and control method based on the photovoltaic power station is characterized by comprising the following steps of: S1, acquiring a current period value of instantaneous active power output by a photovoltaic power generation unit, reading the instantaneous active power of the previous period, counting the power difference value, judging the consistency of the change direction in the continuous period, and generating a photovoltaic output fluctuation trend record; s2, collecting a current period state of charge value in energy storage equipment of the photovoltaic power station, reading the state of charge value of the previous period, calculating a state of charge difference value, dividing a change type by comparing a dynamic response interval range of the charge waves, and generating an energy storage charge change trend record; S3, screening a combination type of which the power is increased and the charge ratio is in a continuous increasing interval according to the photovoltaic output fluctuation trend record and the energy storage charge change trend record, and performing response identification on the corresponding cycle number to generate energy storage response execution cycle data; S4, based on a number list in the energy storage response execution period data, establishing a charge and discharge operation instruction mapping corresponding to each period, recording the state of each command execution zone bit in a communication receipt, and generating an energy storage operation feedback identification result; and S5, according to the energy storage operation feedback identification result, summarizing an execution result corresponding to the period instruction, recording the change condition of the output power curve of the photovoltaic power generation unit and the change trend of the state of charge of the energy storage equipment, and outputting an electric energy regulation log of the energy storage system of the photovoltaic power station.
2. The method for regulating and controlling the electric energy of the energy storage system based on the photovoltaic power station according to claim 1, wherein in the dividing change type process, dividing is performed according to three directions of ascending, stabilizing and descending.
3. The method for regulating and controlling the electric energy of an energy storage system based on a photovoltaic power station according to claim 2, wherein the rising direction specifically means that the state of charge difference is more than one percent of the range of the dynamic response interval of the charge wave; the descending direction specifically means that the state of charge difference value is less than minus one percent of the range of the charge dynamic response interval; The stable direction specifically means that the state of charge difference value is located between plus or minus one percent of the range of the charge electric dynamic response interval.
4. The method for regulating and controlling the electric energy of the energy storage system based on the photovoltaic power station according to claim 1, wherein the photovoltaic output fluctuation trend record comprises a power fluctuation direction label, a fluctuation continuity state and a period number index, the energy storage charge change trend record comprises a charge state fluctuation direction, a fluctuation trend label and a trend change interval mark, the energy storage response execution period data comprises a power-charge trend combination type, a period matching response mark and a response period number list, the energy storage operation feedback identification result comprises an execution flag bit state, a command receipt mark and period execution feedback data, and the photovoltaic power station energy storage system electric energy regulation log comprises an output power curve change record, a charge state trend track and period regulation execution summary.
5. The method for regulating and controlling the electric energy of the energy storage system based on the photovoltaic power station according to claim 1, wherein the step of obtaining the photovoltaic output fluctuation trend record is as follows: s111, acquiring an instantaneous voltage value and an instantaneous current value output by a photovoltaic power generation unit, carrying out point-by-point product operation on the instantaneous voltage value and the instantaneous current value at corresponding moments by combining time resolution parameters in a current control period, executing integral processing on the time length in the current control period according to an operation result, and carrying out normalization calculation to generate instantaneous active power data of the period; S112, calculating a numerical value difference value based on the instantaneous active power data in the period and an instantaneous active power reference value recorded in the previous control period, monitoring symbol states of all power difference values in three continuous control periods, judging whether the symbol states of all power difference values are consistent or not, and recording a judging result to obtain continuous period power change direction characteristic data; and S113, classifying trends of the power difference change direction of the current control period according to the continuous period power change direction characteristic data, constructing a fluctuation trend time sequence, and generating a photovoltaic output fluctuation trend record.
6. The method for regulating and controlling the electric energy of the energy storage system based on the photovoltaic power station according to claim 1, wherein the step of obtaining the record of the change trend of the stored energy charge is as follows: S211, collecting a state of charge percentage value in a current control period in energy storage equipment of a photovoltaic power station, simultaneously reading the state of charge percentage value recorded in a previous control period, and executing numerical value difference calculation operation according to the state of charge percentage values in two periods to obtain energy storage state of charge difference data; s212, carrying out numerical interval positioning judgment on the state of charge difference value range according to the stored energy state of charge difference value data and combining with the state of charge dynamic response interval range, setting the ascending judgment lower limit to be positive one percent of the state of charge dynamic response interval, setting the descending judgment upper limit to be negative one percent of the state of charge dynamic response interval, and respectively dividing according to whether the state of charge difference value is greater than positive one percent, less than negative one percent or between the positive one percent and the negative one percent to obtain a state of charge change interval type label; And S213, based on the charge change interval type label, performing type matching mapping on the type corresponding to the current period charge state change trend, performing structural permutation and combination with a continuous period label sequence, and finishing permutation and combination results combined with timestamp information into a time sequence structure to acquire an energy storage charge change trend record.
7. The method for regulating and controlling electric energy of an energy storage system based on a photovoltaic power station according to claim 1, wherein the step of acquiring the cycle data of the energy storage response execution is: S311, according to the photovoltaic output fluctuation trend record and the energy storage charge change trend record, carrying out data alignment processing on the period number fields of the two types of trend records by combining with a time stamp parameter, and pairing the two types of trend data according to the period number as an index item to generate a trend record pairing sequence; S312, screening cycle combinations which simultaneously meet the conditions that the photovoltaic output trend is rising and the energy storage charging trend is rising according to the photovoltaic trend labels and the charging trend labels corresponding to the cycles in the trend record pairing sequence, recording corresponding cycle numbers, and obtaining a rising trend combination number list; S313, mapping the corresponding period number based on the ascending trend combination number list, giving an energy storage response state identification to the identification field, recording the data writing and state marking of the period response state, and obtaining the energy storage response execution period data.
8. The method for regulating and controlling the electric energy of the energy storage system based on the photovoltaic power station according to claim 1, wherein the step of obtaining the feedback recognition result of the energy storage operation is as follows: s411, establishing an index structure of a charging instruction, a discharging instruction, a pause instruction and a maintenance mode instruction which are in one-to-one correspondence with each cycle number based on a cycle number list in the energy storage response execution cycle data, mapping each cycle number with the operation type to be executed, and generating an energy storage operation instruction mapping table; s412, according to the instruction content of the operation type set in each period in the energy storage operation instruction mapping table, establishing a serial communication link, sequentially transmitting and writing the control instruction of the corresponding period into an issuing queue, and obtaining an energy storage control instruction issuing data frame set; s413, monitoring a communication receipt data packet and analyzing the flag bit state information of the communication receipt data packet aiming at each communication instruction corresponding to the energy storage control instruction issuing data frame set, classifying and integrating the execution flag states of the energy storage operation issuing instructions in each period, and obtaining an energy storage operation feedback identification result.
9. The method for regulating and controlling the electric energy of the energy storage system based on the photovoltaic power station according to claim 1, wherein the step of obtaining the electric energy regulation log of the energy storage system of the photovoltaic power station is as follows: s511, according to the status flag bits of each period instruction execution in the energy storage operation feedback identification result, the flag bits are searched one by one, the flag values are respectively aggregated to be the executed and unexecuted period numbers, the execution success rate of each type of control command is counted, and an energy storage instruction execution statistical matrix is generated; S512, executing a period number list of the completed instruction in the statistical matrix based on the energy storage instruction, advancing active power sequence data output by the photovoltaic power generation unit in a corresponding period, carrying out time serialization processing on a power curve, and constructing a change curve through power values of adjacent time points to obtain photovoltaic power output curve data; And S513, synchronously extracting the percentage value of the energy storage charge state along with the periodic change according to the periodic number and the instruction type label corresponding to the photovoltaic power output curve data and the energy storage instruction execution statistical matrix, and combining the three types of data into a unified structure according to the time sequence to establish an electric energy regulation log of the energy storage system of the photovoltaic power station.
10. An energy storage system electric energy regulation system based on a photovoltaic power station, characterized in that the system is used for realizing the energy storage system electric energy regulation method based on the photovoltaic power station according to any one of claims 1-9, and the system comprises: The power fluctuation extraction module is used for executing S1, namely acquiring the current period value of the instantaneous active power output by the photovoltaic power generation unit, reading the instantaneous active power of the previous period, counting the power difference value, judging the consistency of the change direction in the continuous period, and generating a photovoltaic output fluctuation trend record; The charge amplitude analysis module is used for executing S2, namely collecting the current period state of charge value in the photovoltaic power station energy storage equipment, reading the state of charge value of the previous period, calculating the state of charge difference value, dividing the change type for the dynamic response interval range of the compared charge wave, and generating an energy storage charge change trend record; The response period judging module is used for executing S3, screening the combination type of power rising and charge ratio in a continuous rising interval according to the photovoltaic output fluctuation trend record and the energy storage charge change trend record, and carrying out response identification on the corresponding period number to generate energy storage response executing period data; The regulation and control instruction generation module is used for executing S4, based on a number list in the energy storage response execution period data, establishing a charge and discharge operation instruction mapping corresponding to each period, recording the state of each command execution zone bit in a communication receipt, and generating an energy storage operation feedback identification result; And S5, according to the energy storage operation feedback identification result, summarizing an execution result corresponding to the periodic instruction, recording the change condition of the output power curve of the photovoltaic power generation unit and the change trend of the state of charge of the energy storage equipment, and outputting an electric energy regulation log of the energy storage system of the photovoltaic power station.

Description

Energy storage system electric energy regulation and control method and system based on photovoltaic power station Technical Field The invention relates to the technical field of electric energy regulation, in particular to an energy storage system electric energy regulation method and an energy storage system electric energy regulation system based on a photovoltaic power station. Background The technical field of electric energy regulation and control relates to a scheduling and control method in the processes of acquiring, converting, transmitting, storing and using electric energy, and the method comprises the contents of power grid operation management, electric energy quality optimization, load balance control, power system stability regulation and the like. The real-time monitoring and scheduling control of the electric energy flowing state are realized by constructing a multi-level regulation model, implementing a dynamic regulation mechanism and utilizing a prediction analysis means, so that the coordination and the safety of the operation of the electric power system are improved. In the regulation and control scene of the energy storage system, the electric energy regulation and control technology is particularly critical, and the sustainability and response flexibility of power supply are ensured by reasonably planning the charge and discharge state, the operation time sequence and the energy exchange path of the energy storage device. The traditional energy storage system electric energy regulation and control method mainly aims at the discharge power supply requirement of the energy storage device in the peak load period of the power grid and the charge energy absorption requirement of the valley load period, generally, the simple rule judgment is carried out by setting a fixed charge and discharge time period or a threshold value parameter set based on historical data and combining with a detection value of voltage and current, and a preset control instruction is adopted to carry out charge or discharge operation on the energy storage battery, or connection and disconnection of the energy storage device and the power grid are realized through a relay control loop, so that basic electric energy allocation operation is completed. The existing electric energy regulation and control technology mainly relies on a preset fixed charge and discharge time period or carries out electric energy regulation and control based on a historical parameter threshold value, lacks real-time sensing capability on the current electric power fluctuation state, cannot timely adjust a control strategy when encountering frequent changes of photovoltaic output or dynamic changes of the charge state of energy storage equipment, causes lag or frequent switching of charge and discharge operation, influences the timeliness and stability of response of an energy storage system, is only used as a passive monitoring means, does not carry out deep association judgment with trend changes, easily solves the problem of excessive or insufficient response of the energy storage equipment, and is biased to a static execution mode by regulation and control logic, lacks a feedback adjustment mechanism matched with the actual operation state, so that the self-adaptive regulation and control capability of the energy storage system under a complex operation scene is limited, and the coordination and response efficiency of the system are difficult to guarantee. Disclosure of Invention In order to solve the technical problems in the prior art, the embodiment of the invention provides an energy storage system electric energy regulation method based on a photovoltaic power station, which comprises the following steps: In order to achieve the purpose, the invention adopts the following technical scheme that the energy storage system electric energy regulation and control method based on the photovoltaic power station comprises the following steps: S1, acquiring a current period value of instantaneous active power output by a photovoltaic power generation unit, reading the instantaneous active power of the previous period, counting the power difference value, judging the consistency of the change direction in the continuous period, and generating a photovoltaic output fluctuation trend record; s2, collecting a current period state of charge value in energy storage equipment of the photovoltaic power station, reading the state of charge value of the previous period, calculating a state of charge difference value, dividing a change type by comparing a dynamic response interval range of the charge waves, and generating an energy storage charge change trend record; S3, screening a combination type of which the power is increased and the charge ratio is in a continuous increasing interval according to the photovoltaic output fluctuation trend record and the energy storage charge change trend record, and performing response identification on the corre