CN-121791411-B - Capacitor energy storage control method and system

CN121791411BCN 121791411 BCN121791411 BCN 121791411BCN-121791411-B

Abstract

The invention discloses a capacitor energy storage control method and a capacitor energy storage control system, which belong to the technical field of energy storage control and comprise the steps of phase change material residual heat preservation heat assessment, capacitor module emergency support energy calculation, capacitor module charge-discharge current adjustment, closed loop control and parameter iteration. According to the invention, through evaluating the residual heat preservation heat of the phase-change material, a key temperature boundary condition is provided for subsequent energy calculation, the heat preservation capacity of the phase-change material is deeply coupled with the electric performance of the capacitor, and then closed loop control and parameter iteration are combined to form a closed loop control chain of temperature, energy and current, so that cooperative control of each module is realized, the capacity of the system for coping with complex working conditions is improved, and long-term stable operation of the capacitor energy storage system is ensured.

Inventors

SONG YANZHAO
BAO HUANYU
Cong Wenzhang
ZHU XIAOMING
DING XIN
LIU SHUAI

Assignees

辽宁亿金电子有限公司

Dates

Publication Date: 20260508
Application Date: 20260309

Claims (9)

1. The capacitor energy storage control method is characterized by comprising the following steps of: The residual heat preservation heat of the phase-change material is evaluated, namely the quality, the latent heat, the real-time temperature, the environment real-time temperature and the melting temperature of the phase-change material are collected in real time, the heat preservation effect of the phase-change material on the capacitor module in the current environment is quantified, the residual heat preservation heat parameter is obtained, and the heat preservation capability of the phase-change material on the capacitor module at the current moment is evaluated; calculating the maximum emergency energy output by the capacitor module on the premise of ensuring heat preservation by combining the residual heat preservation heat parameter, the collected capacitor charge and discharge efficiency, the capacitor module real-time voltage and the rated voltage, and ensuring the power grid supporting capacity when the voltage is dropped; The charge and discharge current of the capacitor module is adjusted dynamically according to the emergency support energy of the capacitor module, the predicted duration of voltage sag, the real-time voltage of the capacitor module and the correction coefficient of the power grid voltage, so that the cooperative control of heat preservation and support is realized, and the temperature of the phase change material is influenced in a circulating way; And the closed loop control and parameter iteration are that the temperature of the phase change material is influenced by the adjustment of the charge and discharge current, the change of the temperature of the phase change material also influences the residual heat preservation heat of the phase change material, and further the emergency support energy and the adjustment of the charge and discharge current of the capacitor module are influenced, so that the loop linkage is formed, and the dynamic balance of the system between heat preservation and support is ensured.
2. The method for controlling energy storage of a capacitor according to claim 1, wherein the calculating of the residual heat of the phase change material comprises the following steps: Measuring the quality and latent heat of the phase-change material, directly collecting the real-time temperature of the phase-change material by using a temperature sensor, directly collecting the environment real-time temperature by using an environment temperature sensor, and measuring the melting temperature of the phase-change material; and calculating heat, namely calculating residual heat preservation heat by quantifying the difference value between the real-time temperature of the phase-change material and the real-time temperature of the environment and combining the melting temperature of the phase-change material, evaluating the heat preservation capacity of the phase-change material on the capacitor module, and outputting the calculation result to the emergency support energy calculation step of the capacitor module.
3. The method for controlling energy storage of capacitor according to claim 2, wherein the step of calculating the emergency support energy of the capacitor module comprises the following steps: The method comprises the steps of data acquisition, namely taking a calculation result of residual heat preservation heat of a phase change material as input, acquiring charging current and discharging current through a current sensor, calculating charging and discharging efficiency of a capacitor by combining charging and discharging time, directly acquiring real-time voltage of a capacitor module by utilizing a voltage sensor, and directly acquiring rated voltage of the capacitor module; and calculating energy, namely multiplying the residual heat preservation heat parameter by the charge and discharge efficiency of the capacitor, multiplying the residual heat preservation heat parameter by the ratio of the real-time voltage of the capacitor module to the rated voltage to obtain emergency support energy, and outputting the emergency support energy to a charge and discharge current adjustment step of the capacitor module.
4. The method for controlling energy storage of capacitor as set forth in claim 3, wherein said step of adjusting said charge and discharge currents of said capacitor module comprises: The parameter determination is carried out by taking the calculation result of the emergency support energy of the capacitor module as a basis, collecting the voltage slope of the power grid through a voltage sensor, obtaining the predicted duration of the voltage sag by combining with the fitting of historical data, directly collecting the real-time voltage of the capacitor module through the voltage sensor, collecting the real-time voltage of the power grid and the rated voltage of the power grid by combining with the voltage sensor, and calculating the voltage correction coefficient of the power grid; And (3) current adjustment calculation, namely obtaining a charge-discharge current adjustment value by combining the capacitor emergency support energy, the voltage sag prediction duration, the capacitor module real-time voltage and the grid voltage correction coefficient, and dynamically adjusting the charge-discharge current of the capacitor.
5. The method for capacitor energy storage control as set forth in claim 4, wherein said step of performing closed loop control and parameter iteration comprises: The charge and discharge current of the capacitor module is adjusted through the charge and discharge current adjustment value; the change of the charge-discharge current influences the temperature of the phase-change material through the Joule heat effect; feeding back the change of the temperature of the phase change material to a residual heat preservation heat assessment step, and updating the residual heat preservation heat parameter at the next moment; And repeatedly executing the steps of residual heat preservation heat assessment, emergency support energy calculation and charge-discharge current adjustment to form a closed-loop control chain.
6. The capacitor energy storage control system adopting the capacitor energy storage control method according to any one of claims 1-5 is characterized by comprising a phase change material heat calculation module, a capacitance emergency energy calculation module, a capacitance current adjustment calculation module and a circulation logic control module; The phase change material heat calculation module is configured to execute a phase change material residual heat preservation heat calculation step, collect relevant parameters, calculate effective heat preservation heat, judge whether the capacitor module can preserve heat, and output the result to the capacitor emergency energy calculation module; The capacitor emergency energy calculation module is configured to interact with the phase change material heat calculation module, calculate emergency support energy of the capacitor module based on a calculation result thereof and combining the capacitor charging and discharging efficiency, the real-time voltage and the rated voltage, and output the result to the capacitor current adjustment calculation module; the capacitor current adjustment calculation module is configured to receive the result of the capacitor emergency energy calculation module, dynamically adjust the capacitor charging and discharging current by combining the data of voltage sag prediction, real-time voltage and grid voltage correction coefficient, and output the result to the circulation logic control module; And the circulation logic control module is configured to influence the temperature of the phase-change material through the Joule heat effect according to the result of the capacitance current adjustment calculation module, form circulation feedback and ensure the dynamic balance of the system.
7. The capacitor energy storage control system of claim 6, wherein the phase change material heat calculation module comprises a data acquisition unit and a heat calculation unit: a data acquisition unit configured to acquire parameters of phase change material quality, latent heat, real-time temperature, ambient real-time temperature, and melting temperature; and the heat calculating unit is used for calculating the collected parameters, calculating the effective heat preservation heat of the phase change material and judging whether the heat is needed to be preheated and supplemented.
8. The capacitor energy storage control system of claim 7, wherein the capacitive emergency energy calculation module comprises a data acquisition unit and an energy calculation unit: the data acquisition unit is configured to acquire data of residual heat preservation heat of the phase change material, charging and discharging efficiency of the capacitor, real-time voltage and rated voltage of the capacitor module; The energy calculating unit is configured to calculate the acquired data, calculate emergency support energy of the capacitor module and output a calculation result to the capacitor current adjustment calculating module; The capacitance current adjustment calculation module is used for calculating a charge-discharge current adjustment value by combining the voltage sag prediction duration, the real-time voltage of the capacitance module and the grid voltage correction coefficient, dynamically adjusting the charge-discharge current of the capacitance, and outputting the result to the circulation logic control module.
9. The capacitor energy storage control system of claim 8 wherein the cycling logic control module comprises a temperature influencing unit and a cycling feedback unit: A temperature influencing unit configured to influence the phase change material temperature by joule heating effect according to the result of the capacitance current adjustment calculation module; And the circulating feedback unit feeds back the temperature change of the phase change material to the phase change material heat calculation module, and recalculates the residual heat preservation heat to form circulating linkage, thereby ensuring the dynamic balance and stable operation of the system.

Description

Capacitor energy storage control method and system Technical Field The invention relates to the technical field of energy storage control, in particular to a capacitor energy storage control method and system. Background A capacitor is an electronic element capable of storing electric charges, and is composed of two conductor plates and an insulating medium (dielectric medium) therebetween, and when voltages are applied to the two plates of the capacitor, equal amounts of electric charges are accumulated on the plates, respectively, so that an electric field is established in the dielectric medium, and electric energy is stored in the form of electric field energy. The temperature is one of key factors influencing the performance of the capacitor, the electrical performance of the capacitor can be obviously changed along with the change of the temperature in the operation process, the aging of a medium in the capacitor can be accelerated due to the fact that the temperature is too high, the service life of the capacitor is shortened, the charging and discharging efficiency of the capacitor can be reduced due to the fact that the temperature is too low, and the energy output capacity of the capacitor is influenced, so that the capacitor is ensured to work in a proper temperature range, and the capacitor is very important to maintain the stable performance and ensure the safe operation of a system. In the existing capacitor energy storage system, although temperature control measures are partly adopted, most of the capacitor energy storage system does not realize real-time monitoring and effective regulation and control of the temperature of the capacitor, the traditional method is based on simple control of a fixed temperature threshold value, the actual working condition of the capacitor is complex and changeable, the temperature is difficult to finely manage, the temperature fluctuation is large, the performance stability is influenced, the energy consumption and the operation cost are increased, meanwhile, the capacitor energy storage system is ensured to stably and efficiently operate, the capacitor module is obviously influenced by the temperature and the working condition of a power grid in actual use, the real-time accurate assessment of the heat preservation condition of the phase change material is not needed, the maximum emergency energy is difficult to predict, the problem of insufficient coordination of energy calculation and charge and discharge current adjustment exists, the energy distribution is unreasonable, the system is difficult to dynamically adjust, and the stability is poor under extremely complex working condition. Disclosure of Invention In order to solve the problems that the temperature is difficult to be finely managed and the real-time accurate evaluation of the heat preservation condition of the phase change material is lacking in the background technology and the performance stability is influenced, a capacitor energy storage control method and a capacitor energy storage control system are provided. The technical scheme mainly comprises a capacitor energy storage control method and a capacitor energy storage control system, wherein the capacitor energy storage control method comprises the following steps: The residual heat preservation heat of the phase-change material is evaluated, namely the quality, the latent heat, the real-time temperature, the environment real-time temperature and the melting temperature of the phase-change material are collected in real time, the heat preservation effect of the phase-change material on the capacitor module in the current environment is quantified, the residual heat preservation heat parameter is obtained, and the heat preservation capability of the phase-change material on the capacitor module at the current moment is evaluated; Calculating the maximum emergency energy which can be output by the capacitor module on the premise of ensuring heat preservation by combining the residual heat preservation heat parameter, the collected capacitor charge and discharge efficiency, the capacitor module real-time voltage and rated voltage, and ensuring the power grid supporting capacity when the voltage is dropped; The charge and discharge current of the capacitor module is adjusted dynamically according to the emergency support energy of the capacitor module, the predicted duration of voltage sag, the real-time voltage of the capacitor module and the correction coefficient of the power grid voltage, so that the cooperative control of heat preservation and support is realized, and the temperature of the phase change material is influenced in a circulating way; And the closed loop control and parameter iteration are that the temperature of the phase change material is influenced by the adjustment of the charge and discharge current, the change of the temperature of the phase change material also influences the residual heat preservation heat of the p