Looped network box energy storage system based on distributed control

Abstract

The invention discloses a ring main unit energy storage system based on distributed control, and belongs to the technical field of ring main unit energy storage, and the system comprises a ring main unit which is used for converting the electric energy in a battery pack into DC electric energy so as to achieve the response to a power grid, and converting the electric energy provided by the power grid into DC electric energy so as to enable the ring main unit to store energy; the battery pack is used for providing power for a power grid; and the controller is used for receiving an instruction signal from the power grid and controlling the converter of each ring main unit in a distributed manner according to the instruction signal of the power grid so as to realize optimal control of the power grid. The problems that distributed control cannot be carried out on the ring main unit, quick response cannot be carried out according to the requirements of a power grid, optimal control on the power grid cannot be achieved, and the use effect is poor in the prior art are solved. According to the invention, distributed control is carried out on the operation of the converter of each ring main unit, so that the work of the ring main units is coordinated and consistent, quick response can be carried out according to the demand of a power grid, optimal control on the power grid can be realized, and the use effect can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of ring grid box energy storage, and in particular to a ring grid box energy storage system based on distributed control. Background Art

[0002] Ring main box is a device used in power distribution system, usually installed between distribution transformer and distribution cabinet. It is a device used for tapping, distributing and protecting power system. It is mainly used to control and distribute current. Ring main box is usually used in urban power grid, industrial power and large buildings.

[0003] The ring main box can control and adjust the power system by controlling switches and protective devices, improving the stability and reliability of the power system. In short, the ring main box is an indispensable distribution equipment in the power system. It can realize the distribution, regulation, protection and control of electric energy, ensuring the normal operation and safe use of the power system.

[0004] When the existing ring network box is in use, it cannot perform effective distributed control on the ring network box, cannot respond quickly according to the needs of the power grid, and cannot achieve optimized control of the power grid, resulting in poor use effect. Summary of the invention

[0005] The purpose of the present invention is to provide a ring main box energy storage system based on distributed control, which can effectively perform distributed control on the ring main box, can quickly respond according to the needs of the power grid, can achieve optimized control of the power grid, can improve the use effect, and solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] The ring grid energy storage system based on distributed control includes:

[0008] The ring network box is used to convert the electric energy in the battery pack into DC electric energy to achieve the response to the power grid, and convert the electric energy provided by the power grid into DC electric energy so that the ring network box can store energy;

[0009] A battery pack, used to provide electric energy to the grid according to the command signal of the grid and to protect the batteries in the battery pack;

[0010] The controller is used to receive the command signal from the power grid and distribute the control of the converters of each ring network box according to the command signal of the power grid to achieve optimized control of the power grid.

[0011] Preferably, the ring network box comprises:

[0012] A converter, used for converting the electric energy in the battery pack into AC electric energy, and transmitting the AC electric energy to the power grid to achieve response to the power grid;

[0013] The power module is used for the converter to convert the electric energy provided by the power grid into DC electric energy and store the DC electric energy so that the ring network box can store energy.

[0014] Preferably, the battery pack is provided with a protection circuit module, and the protection circuit module is used to protect the batteries in the battery pack to prevent the batteries from being overcharged or over-discharged.

[0015] Preferably, the protection circuit module comprises:

[0016] A battery monitoring unit, used to monitor the charging and discharging process of the battery;

[0017] Based on sensors, the voltage and current of the battery charging and discharging process are monitored in real time and continuously collected to obtain real-time battery monitoring data;

[0018] An analysis and evaluation unit, used for analyzing and evaluating the charging and discharging process of the battery;

[0019] According to the circuit protection requirements in the battery pack, the battery monitoring threshold data is pre-set;

[0020] Based on the battery monitoring threshold data, the real-time battery monitoring data is compared and analyzed to evaluate the battery charging and discharging process, determine whether the battery is overcharged or over-discharged, and determine the battery monitoring analysis and evaluation results;

[0021] When the real-time battery monitoring data is within the battery monitoring threshold data range, the battery monitoring analysis and evaluation result is that the battery is not overcharged or over-discharged;

[0022] Among them, when the real-time battery monitoring data is not within the battery monitoring threshold data range, the battery monitoring analysis and evaluation result is that the battery is overcharged or over-discharged.

[0023] Preferably, the protection circuit module further includes:

[0024] A protection and control unit, used for protecting and controlling the batteries in the battery pack;

[0025] Obtain battery monitoring analysis and evaluation results;

[0026] Develop a battery pack protection and control plan based on battery monitoring, analysis and evaluation results;

[0027] Based on the battery pack protection and control solution, the batteries in the battery pack are protected and controlled;

[0028] When the battery is overcharged or over-discharged, the power supply is immediately cut off to avoid damage to the battery, and the battery pack is warned to promptly prompt management personnel to manage and maintain the battery pack.

[0029] Preferably, the controller comprises:

[0030] A command receiving unit, used for receiving a command signal from a power grid;

[0031] A response control unit, used to control the converters of each ring network box to achieve response to the power grid;

[0032] Obtaining a command signal of a power grid and analyzing the command signal of the power grid;

[0033] Based on the command signal of the power grid, the operation of the converters of each ring network box is controlled in a distributed manner, so that the work between the ring network boxes is coordinated and consistent, and a quick response is made according to the needs of the power grid to achieve optimized control of the power grid.

[0034] Preferably, controlling the converter of each ring network box to achieve response to the power grid includes:

[0035] When receiving the command signal from the power grid that the power supply needs to be increased, the controller controls the converters of each ring network box, converts the power of the battery pack into AC power through the converter, and transmits the AC power to the power grid, responding quickly according to the needs of the power grid;

[0036] When the command signal received from the power grid is to reduce the power supply, the controller controls the converter of each ring network box, converts the electric energy provided by the power grid into DC electric energy through the converter, and transmits the DC electric energy to the power module, so that the power module stores DC electric energy and the ring network box stores energy.

[0037] Preferably, the controller controls the converter of each ring network box to perform the following operations:

[0038] Based on the command signal of the power grid, the energy storage situation of each ring network box is detected to determine the energy storage result of each ring network box; when the energy storage situation of each ring network box cannot meet the needs of the power grid, the controller controls the operation of the converter of each ring network box to coordinate the work between the ring network boxes, convert the electric energy of the battery pack into AC power through the converter, and transmit the AC power to the power grid to respond quickly to the needs of the power grid.

[0039] Preferably, the controller controls the converter of each ring network box and also performs the following operations:

[0040] When the energy storage of each ring network box cannot meet the grid demand, the operation response time of the converter of each ring network box is monitored in real time;

[0041] According to the number of times that the energy storage situation of each ring network box cannot meet the grid demand, the operation response time of the converter of the ring network box is obtained each time the energy storage situation cannot meet the grid demand;

[0042] According to the operation response time of each converter, the operation response coefficient of the converter corresponding to the ring network box is obtained;

[0043] The operation response coefficient of the converter corresponding to the ring network box is obtained by the following formula:

[0044]

[0045] Where R represents the operating response coefficient of the converter corresponding to the ring network box; n represents the number of times the energy storage of the ring network box cannot meet the grid demand; T i represents the operation response time of the converter when the energy storage of the ring network box cannot meet the grid demand; T max Indicates the maximum allowable value of the preset converter operation response time; T c Indicates the preset reference value of the operation response time; T fmax Indicates that the energy storage of the n-time ring network box cannot meet the maximum value of the floating operation response time in the grid demand; T fmin Indicates that the energy storage of the n-th ring network box cannot meet the minimum floating value of the operation response time in the power grid demand; T b Indicates that the energy storage of the n-time ring network box cannot meet the standard deviation of the operation response time required by the power grid; T z Indicates that the energy storage of the n-th ring network box cannot meet the middle value of the operation response time required by the power grid;

[0046] Comparing the operation response coefficient of the converter corresponding to the ring network box with a preset response coefficient threshold;

[0047] When the operation response coefficient of the converter corresponding to the ring network box exceeds a preset response coefficient threshold, it is determined whether it is necessary to respond to an abnormal operation alarm of the ring network box.

[0048] Preferably, when the operation response coefficient of the converter corresponding to the ring network box exceeds a preset response coefficient threshold, it is determined whether it is necessary to respond to an abnormal operation alarm of the ring network box, including:

[0049] When the operation response coefficient of the converter corresponding to the ring network box exceeds a preset response coefficient threshold, the ring network box corresponding to the converter whose operation response coefficient exceeds the preset response coefficient threshold is used as a target ring network box;

[0050] Extracting a preset correlation coefficient between the target ring network box and other ring network boxes;

[0051] Compare the correlation coefficient between the target ring network box and other ring network boxes with a preset correlation coefficient threshold, and select the ring network box whose correlation coefficient with the target ring network box is not less than the preset correlation coefficient threshold as the observation ring network box;

[0052] Extracting the operation response coefficient corresponding to the observation ring network box;

[0053] Extracting the operation response coefficient corresponding to the target ring network box;

[0054] Obtaining a comprehensive operation response coefficient using the operation response coefficient corresponding to the observation ring network box and the operation response coefficient corresponding to the target ring network box;

[0055] The comprehensive operation response coefficient is obtained by the following formula:

[0056]

[0057] Among them, R c represents the comprehensive operation response coefficient; m represents the number of observation ring network boxes; R i G represents the operation response coefficient corresponding to the i-th observation ring network box; i represents the correlation coefficient corresponding to the ith observation ring network box; R x Indicates the operation response coefficient corresponding to the target ring network box; R b G represents the standard deviation of the operation response coefficient corresponding to m observation ring network boxes; b represents the standard deviation of the correlation coefficient corresponding to m observation ring network boxes; K represents the adjustment coefficient, and the adjustment coefficient is obtained by the following formula:

[0058]

[0059] Among them, K represents the adjustment coefficient; G max represents the maximum value of the correlation coefficient corresponding to m observation ring network boxes; R max It indicates the operation response coefficient of the observation ring network box corresponding to the maximum value of the correlation coefficient; R m G represents the maximum value of the operation response coefficient corresponding to m observation ring network boxes; m Indicates the correlation coefficient corresponding to the observation ring network box corresponding to the maximum value of the operation response coefficient; R x Indicates the operation response coefficient corresponding to the target ring network box;

[0060] comparing the comprehensive operation response coefficient with a preset comprehensive coefficient threshold;

[0061] When the comprehensive operation response coefficient exceeds a preset comprehensive coefficient threshold, it is determined that the transformer of the target ring network box has a response operation abnormality, and a response operation abnormality alarm is issued.

[0062] Compared with the prior art, the present invention has the following beneficial effects:

[0063] 1. The present invention provides electric energy to a power grid through a battery pack, and the battery pack is provided with a protection circuit module, the protection circuit module is used to protect the batteries in the battery pack to prevent the batteries from being overcharged or over-discharged, wherein the battery monitoring threshold data is pre-set according to the circuit protection requirements in the battery pack, and the battery monitoring real-time data is compared and analyzed based on the battery monitoring threshold data to evaluate the battery charging and discharging process, determine whether the battery is overcharged or over-discharged, determine the battery monitoring analysis and evaluation results, and formulate a battery pack protection control plan to protect and control the batteries in the battery pack. When the battery is overcharged or over-discharged, the power supply is immediately cut off to avoid damage to the battery, and an early warning alarm is issued for the battery pack to promptly prompt the management personnel to manage and maintain the battery pack.

[0064] 2. The present invention converts the electric energy in the battery pack into DC electric energy through the converter of the ring network box to achieve response to the power grid, and converts the electric energy provided by the power grid into DC electric energy to store energy in the ring network box, wherein the operation of the converters of each ring network box is distributedly controlled based on the command signal of the power grid, so that the work between the ring network boxes is coordinated and consistent, and a rapid response is made according to the needs of the power grid to achieve optimized control of the power grid. The ring network box can be effectively distributedly controlled, and a rapid response can be made according to the needs of the power grid to achieve optimized control of the power grid, thereby improving the use effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0065] Figure 1 It is a structural block diagram of the ring network box energy storage system based on distributed control of the present invention;

[0066] Figure 2 The present invention is a flow chart of controlling the converters of each ring network box to achieve the response to the power grid. DETAILED DESCRIPTION

[0067] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0068] In order to solve the problem that the existing ring network box cannot be effectively distributed controlled, cannot respond quickly according to the needs of the power grid, cannot achieve optimized control of the power grid, and leads to poor use effect, please refer to Figure 1-Figure 2 , this embodiment provides the following technical solutions:

[0069] A ring network box energy storage system based on distributed control includes: a ring network box, a battery pack and a controller.

[0070] It should be noted that each ring network box includes a power module and an inverter, which are used to convert the electrical energy in the battery pack into DC power. The controller is responsible for receiving command signals from the power grid and controlling the inverters of each ring network box to respond to the power grid. The battery pack is equipped with a protection circuit to prevent the battery from overcharging or over-discharging. Through the distributed control of the controller, the work of the ring network boxes can be coordinated and consistent, and can respond quickly according to the needs of the power grid to achieve optimized control of the power grid.

[0071] Specifically, the ring grid box is used to convert the electric energy in the battery pack into DC electric energy to achieve the response to the power grid, and convert the electric energy provided by the power grid into DC electric energy so that the ring grid box can store energy;

[0072] In this embodiment, the ring network box includes:

[0073] A converter, used for converting the electric energy in the battery pack into AC electric energy, and transmitting the AC electric energy to the power grid to achieve response to the power grid;

[0074] The power module is used for the converter to convert the electric energy provided by the power grid into DC electric energy and store the DC electric energy so that the ring network box can store energy.

[0075] It should be noted that the converter is an electrical device that changes the voltage, frequency, number of phases and other electrical quantities or characteristics of the power supply system. In addition to the main circuit (rectifier circuit, inverter circuit, AC conversion circuit and DC conversion circuit), the converter also needs a trigger circuit (or drive circuit) that controls the on and off of the power switch element and a control circuit that realizes the regulation and control of electric energy. The trigger circuit of the converter includes two parts: a pulse generator and a pulse output device. The former generates a pulse of a certain frequency, a certain width or a certain phase according to the requirements of the control signal; the latter amplifies the level of the pulse into a drive signal suitable for the power switch element in the converter.

[0076] The control circuit of the converter is divided into loop control circuit and closed-loop control circuit according to the control method. The former is mainly used in some special equipment with low requirements, and the latter has the function of automatic control and regulation, and is widely used in various working machinery; according to the nature of the control signal, it is divided into analog control circuit and digital control circuit. The most commonly used analog signals are DC voltage and current, which are convenient for electrical processing and conversion; digital signals are a set of information parameters with discontinuous changes in discrete values. Digital control has high precision, but the circuit is relatively complex and expensive. Therefore, the digital-analog hybrid control circuit is actually widely used.

[0077] Specifically, the battery pack is used to provide electric energy to the grid according to the command signal of the grid and to protect the batteries in the battery pack;

[0078] In this embodiment, the battery pack is provided with a protection circuit module, and the protection circuit module is used to protect the batteries in the battery pack to prevent the batteries from being overcharged or over-discharged.

[0079] In this embodiment, the protection circuit module includes:

[0080] A battery monitoring unit, used to monitor the charging and discharging process of the battery;

[0081] Based on sensors, the voltage and current of the battery charging and discharging process are monitored in real time and continuously collected to obtain real-time battery monitoring data;

[0082] It should be noted that the voltage condition of the battery during the charging and discharging process is monitored in real time and continuously collected through a voltage sensor to obtain battery monitoring voltage data; the current condition of the battery during the charging and discharging process is monitored in real time and continuously collected through a current sensor to obtain battery monitoring current data; wherein, the battery monitoring real-time data is determined based on the battery monitoring voltage data and the battery monitoring current data.

[0083] It should be noted that a voltage sensor refers to a sensor that can sense the voltage being measured and convert it into a usable output signal. In various automatic detection and control systems, it is often necessary to track and collect high-speed changing AC and DC voltage signals, and perform spectrum analysis on more complex voltage waveforms. Such signals may be strong electricity such as high voltage and high current, or they may be weak electricity with poor load capacity or signals with very small amplitude. In these cases, it is necessary to use suitable voltage sensors to collect voltage signals that cannot be directly measured or are not matched, so as to obtain standardized and electrically isolated voltage signals.

[0084] Among them, the function of the voltage sensor is to automatically detect the voltage, so that we can control and display the voltage during the battery charging and discharging process, and take automatic protection measures such as overvoltage and undervoltage when necessary.

[0085] It should be noted that the current sensor is a device that senses the information of the measured current. The small power supply equipment has integrated more and more new technologies, such as switching power supply, hard switch, soft switch, voltage regulation, linear feedback voltage regulation, magnetic amplifier technology, CNC voltage regulation, PWM, SPWM, electromagnetic compatibility, etc.; actual demand directly promotes the continuous development and progress of power supply technology. In order to automatically detect and display current, and have automatic protection functions and more advanced intelligent control when dangerous situations such as overcurrent and overvoltage occur, power supply technology with sensor detection, sensor sampling, and sensor protection has gradually become a trend, and sensors for detecting current or voltage have emerged and are gradually favored by power supply designers in my country.

[0086] Among them, current sensors can be mainly divided into: shunts, electromagnetic current transformers, electronic current transformers, etc. according to different measurement principles; electronic current transformers include Hall current sensors, Rogowski current sensors and AnyWay variable frequency power sensors specially used for variable frequency electrical quantity measurement; compared with electromagnetic current sensors, electronic current transformers have no ferromagnetic saturation, wide transmission bandwidth, small secondary load capacity, small size, light weight, and are the future development direction of current sensors.

[0087] An analysis and evaluation unit, used for analyzing and evaluating the charging and discharging process of the battery;

[0088] According to the circuit protection requirements in the battery pack, the battery monitoring threshold data is pre-set;

[0089] It should be noted that by setting the battery monitoring threshold data, it is convenient to conduct subsequent comparative analysis of the real-time battery monitoring data, evaluate the battery charging and discharging process, judge whether the battery is overcharged or over-discharged, and determine the battery monitoring analysis and evaluation results, so as to take timely protection measures to protect the batteries in the battery pack.

[0090] Based on the battery monitoring threshold data, the real-time battery monitoring data is compared and analyzed to evaluate the battery charging and discharging process, determine whether the battery is overcharged or over-discharged, and determine the battery monitoring analysis and evaluation results;

[0091] When the real-time battery monitoring data is within the battery monitoring threshold data range, the battery monitoring analysis and evaluation result is that the battery is not overcharged or over-discharged;

[0092] Among them, when the real-time battery monitoring data is not within the battery monitoring threshold data range, the battery monitoring analysis and evaluation result is that the battery is overcharged or over-discharged.

[0093] It should be noted that based on the battery monitoring threshold data, the battery monitoring real-time data is compared and analyzed, wherein the battery monitoring analysis and evaluation results are shown in Table 1:

[0094] Table 1: Battery monitoring analysis and evaluation results

[0095]

[0096]

[0097] It can be seen that when the real-time battery monitoring data is within the battery monitoring threshold data range, the battery is not overcharged or over-discharged; when the real-time battery monitoring data is not within the battery monitoring threshold data range, the battery is overcharged or over-discharged. By monitoring and judging the overcharge or over-discharge of the battery, timely protection measures can be taken to protect the batteries in the battery pack and prevent battery damage.

[0098] In this embodiment, the protection circuit module further includes:

[0099] A protection and control unit, used for protecting and controlling the batteries in the battery pack;

[0100] Obtain battery monitoring analysis and evaluation results;

[0101] Develop a battery pack protection and control plan based on battery monitoring, analysis and evaluation results;

[0102] Based on the battery pack protection and control solution, the batteries in the battery pack are protected and controlled;

[0103] When the battery is overcharged or over-discharged, the power supply is immediately cut off to avoid damage to the battery, and the battery pack is warned to promptly prompt management personnel to manage and maintain the battery pack.

[0104] It should be noted that based on the battery monitoring analysis and evaluation results, a battery pack protection and control plan is formulated to protect and control the batteries in the battery pack, which can protect the batteries in the battery pack and prevent battery damage.

[0105] Specifically, the controller is used to receive a command signal from the power grid, and to distribute control the converters of each ring network box according to the command signal of the power grid to achieve optimized control of the power grid.

[0106] In this embodiment, the controller includes:

[0107] A command receiving unit, used for receiving a command signal from a power grid;

[0108] It should be noted that when distributed control is performed on each ring network box, the command signal transmitted by the power grid is captured in real time, and the command signal from the power grid is received. According to the command signal from the power grid, distributed control and adjustment and optimization are performed on each ring network box to maximize the utilization of electric energy.

[0109] A response control unit, used to control the converters of each ring network box to achieve response to the power grid;

[0110] Obtaining a command signal of a power grid and analyzing the command signal of the power grid;

[0111] Based on the command signal of the power grid, the operation of the converters of each ring network box is controlled in a distributed manner, so that the work between the ring network boxes is coordinated and consistent, and a quick response is made according to the needs of the power grid to achieve optimized control of the power grid.

[0112] When the command signal received from the power grid indicates that the power supply needs to be increased, the controller controls the converters of each ring network box, converts the power of the battery pack into AC power through the converter, and transmits the AC power to the power grid, responding quickly according to the needs of the power grid;

[0113] Among them, when the command signal received from the power grid is to reduce the power supply, the controller controls the inverter of each ring network box, converts the electric energy provided by the power grid into DC electric energy through the inverter, and transmits the DC electric energy to the power module, so that the power module stores DC electric energy and the ring network box stores energy.

[0114] It should be noted that, according to the power grid command signal, the operation of the converter of each ring network box is distributedly controlled, wherein the operation of the converter of each ring network box is distributedly controlled as shown in Table 2:

[0115] Table 2: Distributed control of converter operation in each ring network box

[0116]

[0117] Therefore, when the command signal received from the power grid is to increase the power supply, the controller controls the inverter of each ring network box, converts the electric energy of the battery pack into AC power through the inverter, and transmits the AC power to the power grid, responding quickly according to the needs of the power grid; when the command signal received from the power grid is to reduce the power supply, the controller controls the inverter of each ring network box, converts the electric energy provided by the power grid into DC power through the inverter, and transmits the DC power to the power module, so that the power module stores DC power and the ring network box stores energy, so that the work between the ring network boxes can be coordinated and responded quickly according to the needs of the power grid, thereby realizing optimized control of the power grid.

[0118] Among them, based on the command signal of the power grid, the energy storage situation of each ring network box is detected to determine the energy storage result of each ring network box; when the energy storage situation of each ring network box cannot meet the needs of the power grid, the controller controls the operation of the inverter of each ring network box to make the work between the ring network boxes coordinated and consistent, and convert the electric energy of the battery pack into AC power through the inverter, and transmit the AC power to the power grid, so as to respond quickly to the needs of the power grid.

[0119] Specifically, the controller controls the converters of each ring network box and also performs the following operations:

[0120] When the energy storage of each ring network box cannot meet the grid demand, the operation response time of the converter of each ring network box is monitored in real time;

[0121] According to the number of times that the energy storage situation of each ring network box cannot meet the grid demand, the operation response time of the converter of the ring network box is obtained each time the energy storage situation cannot meet the grid demand;

[0122] According to the operation response time of each converter, the operation response coefficient of the converter corresponding to the ring network box is obtained;

[0123] The operation response coefficient of the converter corresponding to the ring network box is obtained by the following formula:

[0124]

[0125] Where R represents the operating response coefficient of the converter corresponding to the ring network box; n represents the number of times the energy storage of the ring network box cannot meet the grid demand; T i represents the operation response time of the converter when the energy storage of the ring network box cannot meet the grid demand; T max Indicates the maximum allowable value of the preset converter operation response time; T c Indicates the preset reference value of the operation response time; T fmax Indicates that the energy storage of the n-time ring network box cannot meet the maximum value of the floating operation response time in the grid demand; T fmin Indicates that the energy storage of the n-th ring network box cannot meet the minimum floating value of the operation response time in the power grid demand; T b Indicates that the energy storage of the n-time ring network box cannot meet the standard deviation of the operation response time required by the power grid; T z Indicates that the energy storage of the n-th ring network box cannot meet the middle value of the operation response time required by the power grid;

[0126] Comparing the operation response coefficient of the converter corresponding to the ring network box with a preset response coefficient threshold;

[0127] When the operation response coefficient of the converter corresponding to the ring network box exceeds a preset response coefficient threshold, it is determined whether it is necessary to respond to an abnormal operation alarm of the ring network box.

[0128] The technical effect of the above technical solution is: by real-time monitoring of the operation response time of the converter of each ring network box, the technical solution can quickly capture the moment when the energy storage situation cannot meet the power grid demand, so as to respond in time. This real-time monitoring capability ensures the stability and reliability of the power grid. By obtaining the operation response time of the converter each time the energy storage situation cannot meet the power grid demand and calculating the operation response coefficient, the technical solution can accurately evaluate the performance of the converter. When the operation response coefficient exceeds the preset response coefficient threshold, the system can automatically determine whether it is necessary to respond to the abnormal operation alarm, so as to warn of potential faults or performance degradation problems in advance. The technical solution takes into account multiple statistics of the operation response time (such as maximum value, minimum value, standard deviation, median value, etc.), so that the evaluation results are more comprehensive and accurate. At the same time, through the preset parameters such as the maximum allowable value of the converter operation response time and the reference value of the operation response time, the technical solution can be dynamically adjusted according to the changes in the power grid demand and converter performance, thereby improving the adaptability and flexibility of the system. By analyzing and comparing the converter operation response coefficient, the technical solution can timely discover potential faults or performance problems, so as to take corresponding measures to prevent or repair them. This helps reduce power outages or instability caused by equipment failures and improves the reliability and safety of the power grid. This technical solution provides detailed data support and decision-making basis for operation and maintenance personnel, making operation and maintenance work more scientific and efficient. By regularly analyzing the operation response coefficient of the converter, operation and maintenance personnel can promptly discover and solve equipment performance problems, optimize operation and maintenance strategies, and reduce operation and maintenance costs.

[0129] In summary, the technical effects of this technical solution in terms of performance indicators are mainly reflected in real-time monitoring and response capabilities, accurate assessment and early warning, dynamic adaptability, fault prevention and diagnosis, and optimized operation and maintenance management. These effects have jointly improved the stability and reliability of the power grid, reduced operation and maintenance costs, and provided a strong guarantee for the safe and efficient operation of the power system.

[0130] Specifically, when the operation response coefficient of the converter corresponding to the ring network box exceeds a preset response coefficient threshold, it is determined whether it is necessary to respond to an abnormal operation alarm of the ring network box, including:

[0131] When the operation response coefficient of the converter corresponding to the ring network box exceeds a preset response coefficient threshold, the ring network box corresponding to the converter whose operation response coefficient exceeds the preset response coefficient threshold is used as a target ring network box;

[0132] Extracting a preset correlation coefficient between the target ring network box and other ring network boxes;

[0133] Compare the correlation coefficient between the target ring network box and other ring network boxes with a preset correlation coefficient threshold, and select the ring network box whose correlation coefficient with the target ring network box is not less than the preset correlation coefficient threshold as the observation ring network box;

[0134] Extracting the operation response coefficient corresponding to the observation ring network box;

[0135] Extracting the operation response coefficient corresponding to the target ring network box;

[0136] Obtaining a comprehensive operation response coefficient using the operation response coefficient corresponding to the observation ring network box and the operation response coefficient corresponding to the target ring network box;

[0137] The comprehensive operation response coefficient is obtained by the following formula:

[0138]

[0139] Among them, R c represents the comprehensive operation response coefficient; m represents the number of observation ring network boxes; R i G represents the operation response coefficient corresponding to the i-th observation ring network box; i represents the correlation coefficient corresponding to the ith observation ring network box; R x Indicates the operation response coefficient corresponding to the target ring network box; R b G represents the standard deviation of the operation response coefficient corresponding to m observation ring network boxes; b represents the standard deviation of the correlation coefficient corresponding to m observation ring network boxes; K represents the adjustment coefficient, and the adjustment coefficient is obtained by the following formula:

[0140]

[0141] Among them, K represents the adjustment coefficient; G max represents the maximum value of the correlation coefficient corresponding to m observation ring network boxes; R max It indicates the operation response coefficient of the observation ring network box corresponding to the maximum value of the correlation coefficient; R m G represents the maximum value of the operation response coefficient corresponding to m observation ring network boxes; m Indicates the correlation coefficient corresponding to the observation ring network box corresponding to the maximum value of the operation response coefficient; R x Indicates the operation response coefficient corresponding to the target ring network box;

[0142] comparing the comprehensive operation response coefficient with a preset comprehensive coefficient threshold;

[0143] When the comprehensive operation response coefficient exceeds a preset comprehensive coefficient threshold, it is determined that the transformer of the target ring network box has a response operation abnormality, and a response operation abnormality alarm is issued.

[0144] The technical effect of the above technical solution is: by taking the ring network box whose operation response coefficient exceeds the preset threshold as the target ring network box and extracting the correlation coefficient between it and other ring network boxes, the technical solution can accurately locate the ring network box that may have problems and further analyze the ring network boxes associated with it. This correlation analysis helps to more comprehensively understand the background of the problem and the possible scope of impact. By calculating the comprehensive operation response coefficient, the technical solution can comprehensively consider the operating status of the target ring network box and its observation ring network box, so as to more accurately evaluate the operating status of the entire system. When the comprehensive operation response coefficient exceeds the preset threshold, the system can automatically trigger the response operation abnormality alarm and promptly remind the operation and maintenance personnel to handle it. The introduction of the adjustment coefficient makes the calculation of the comprehensive operation response coefficient more flexible and dynamic. By considering the relative size of the correlation coefficient and the operation response coefficient of the observation ring network box, the adjustment coefficient can be automatically adjusted to reflect the degree of influence of different observation ring network boxes on the operating status of the target ring network box. This dynamic adjustment capability improves the adaptability and accuracy of the technical solution. By analyzing the comprehensive operation response coefficient, the technical solution can predict whether the transformer of the target ring network box has the risk of abnormal response operation. This predictive capability helps operators take measures in advance to prevent potential failures, thereby avoiding or reducing power outages or instability events. The technical solution provides operators with detailed data support and decision-making basis. By combining the results of the operation response coefficient and the correlation analysis, operators can more accurately judge the severity of the problem and the possible scope of impact, thereby formulating a more scientific and efficient operation and maintenance strategy. Through real-time monitoring and comprehensive analysis of the operating status of the ring network box and its transformer, the technical solution can promptly discover and deal with potential problems, thereby improving the stability and reliability of the power grid. This is of great significance for ensuring the safe and efficient operation of the power system.

[0145] In summary, the technical effects of this technical solution in terms of performance indicators are mainly reflected in precise positioning and correlation analysis, comprehensive evaluation and early warning, dynamic adjustment and adaptability, fault prediction and prevention, optimization of operation and maintenance decisions, and improvement of grid stability and reliability. These effects jointly improve the operation and maintenance management level of the power system and provide a strong guarantee for the safe and efficient operation of the power grid.

[0146] In summary, the electric energy in the battery pack is converted into DC electric energy through the inverter of the ring network box to achieve response to the power grid, and the electric energy provided by the power grid is converted into DC electric energy to store energy in the ring network box. The inverter operation of each ring network box is distributedly controlled based on the command signal of the power grid, so that the work between the ring network boxes is coordinated and consistent, and the power grid can be quickly responded to according to the needs of the power grid to achieve optimized control of the power grid. The ring network box can be effectively distributedly controlled, can be quickly responded to according to the needs of the power grid, can achieve optimized control of the power grid, and can improve the use effect.

[0147] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0148] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. The ring network box energy storage system based on distributed control is characterized by: include: The ring network box is used to convert the electric energy in the battery pack into DC electric energy to achieve the response to the power grid, and convert the electric energy provided by the power grid into DC electric energy so that the ring network box can store energy; A battery pack, used to provide electric energy to the grid according to the command signal of the grid and to protect the batteries in the battery pack; The controller is used to receive the command signal from the power grid and distribute the control of the converters of each ring network box according to the command signal of the power grid to achieve optimized control of the power grid.

2. The distributed control-based ring network box energy storage system according to claim 1 is characterized in that: The ring network box comprises: A converter, used for converting the electric energy in the battery pack into AC electric energy, and transmitting the AC electric energy to the power grid to achieve response to the power grid; The power module is used for the converter to convert the electric energy provided by the power grid into DC electric energy and store the DC electric energy so that the ring network box can store energy.

3. The distributed control-based ring network box energy storage system according to claim 2 is characterized in that: The battery pack is provided with a protection circuit module, and the protection circuit module is used to protect the batteries in the battery pack.

4. The distributed control-based ring network box energy storage system according to claim 3 is characterized in that: The protection circuit module comprises: A battery monitoring unit, used to monitor the charging and discharging process of the battery; Based on sensors, the voltage and current of the battery charging and discharging process are monitored in real time and continuously collected to obtain real-time battery monitoring data; An analysis and evaluation unit, used for analyzing and evaluating the charging and discharging process of the battery; According to the circuit protection requirements in the battery pack, the battery monitoring threshold data is pre-set; Based on the battery monitoring threshold data, the real-time battery monitoring data is compared and analyzed to evaluate the battery charging and discharging process, determine whether the battery is overcharged or over-discharged, and determine the battery monitoring analysis and evaluation results; When the real-time battery monitoring data is within the battery monitoring threshold data range, the battery monitoring analysis and evaluation result is that the battery is not overcharged or over-discharged; Among them, when the real-time battery monitoring data is not within the battery monitoring threshold data range, the battery monitoring analysis and evaluation result is that the battery is overcharged or over-discharged.

5. The distributed control-based ring network box energy storage system according to claim 4 is characterized in that: The protection circuit module further includes: A protection control unit, used for protecting and controlling the batteries in the battery pack; Obtain battery monitoring analysis and evaluation results; Develop a battery pack protection and control plan based on battery monitoring, analysis and evaluation results; Based on the battery pack protection and control solution, the batteries in the battery pack are protected and controlled; When the battery is overcharged or over-discharged, the power supply is immediately cut off to avoid damage to the battery, and the battery pack is warned to promptly prompt management personnel to manage and maintain the battery pack.

6. The distributed control-based ring network box energy storage system according to claim 5 is characterized in that: The controller comprises: A command receiving unit, used for receiving a command signal from a power grid; A response control unit, used to control the converters of each ring network box to achieve response to the power grid; Obtaining a command signal of a power grid and analyzing the command signal of the power grid; Based on the command signal of the power grid, the converter operation of each ring network box is controlled in a distributed manner, so that the work between the ring network boxes is coordinated and consistent, and a quick response is made according to the needs of the power grid to achieve optimized control of the power grid.

7. The distributed control-based ring network box energy storage system according to claim 6 is characterized in that: Control the converters of each ring network box to achieve the response to the power grid, including: When receiving the command signal from the power grid that the power supply needs to be increased, the controller controls the converters of each ring network box, converts the power of the battery pack into AC power through the converter, and transmits the AC power to the power grid, responding quickly according to the needs of the power grid; When the command signal received from the power grid is to reduce the power supply, the controller controls the converter of each ring network box, converts the electric energy provided by the power grid into DC electric energy through the converter, and transmits the DC electric energy to the power module, so that the power module stores DC electric energy and the ring network box stores energy.

8. The distributed control-based ring network box energy storage system according to claim 7, characterized in that: The controller controls the converters of each ring network box and performs the following operations: Based on the command signal of the power grid, the energy storage situation of each ring network box is detected to determine the energy storage result of each ring network box; when the energy storage situation of each ring network box cannot meet the needs of the power grid, the controller controls the operation of the converter of each ring network box to coordinate the work between the ring network boxes, convert the electric energy of the battery pack into AC power through the converter, and transmit the AC power to the power grid to respond quickly to the needs of the power grid.

9. The distributed control-based ring network box energy storage system according to claim 8, characterized in that: The controller controls the converters of each ring network box and also performs the following operations: When the energy storage of each ring network box cannot meet the grid demand, the operation response time of the converter of each ring network box is monitored in real time; According to the number of times that the energy storage situation of each ring network box cannot meet the grid demand, the operation response time of the converter of the ring network box is obtained each time when the energy storage situation cannot meet the grid demand; According to the operation response time of each converter, the operation response coefficient of the converter corresponding to the ring network box is obtained; The operation response coefficient of the converter corresponding to the ring network box is obtained by the following formula: Where R represents the operating response coefficient of the converter corresponding to the ring network box; n represents the number of times the energy storage of the ring network box cannot meet the grid demand; T i represents the operation response time of the converter when the energy storage of the ring network box cannot meet the grid demand; T max Indicates the maximum allowable value of the preset converter operation response time; T c Indicates the preset reference value of the operation response time; T fmax Indicates that the energy storage of the n-time ring network box cannot meet the maximum value of the floating operation response time in the grid demand; T fmin Indicates that the energy storage of the n-th ring network box cannot meet the minimum floating value of the operation response time in the power grid demand; T b Indicates that the energy storage of the n-time ring network box cannot meet the standard deviation of the operation response time required by the power grid; T z Indicates that the energy storage of the n-th ring network box cannot meet the middle value of the operation response time required by the power grid; Comparing the operation response coefficient of the converter corresponding to the ring network box with a preset response coefficient threshold; When the operation response coefficient of the converter corresponding to the ring network box exceeds a preset response coefficient threshold, it is determined whether it is necessary to respond to an abnormal operation alarm of the ring network box.

10. The distributed control-based ring network box energy storage system according to claim 9, characterized in that: When the operation response coefficient of the converter corresponding to the ring network box exceeds a preset response coefficient threshold, it is determined whether it is necessary to respond to an abnormal operation alarm of the ring network box, including: When the operation response coefficient of the converter corresponding to the ring network box exceeds a preset response coefficient threshold, the ring network box corresponding to the converter whose operation response coefficient exceeds the preset response coefficient threshold is used as a target ring network box; Extracting a preset correlation coefficient between the target ring network box and other ring network boxes; Compare the correlation coefficient between the target ring network box and other ring network boxes with a preset correlation coefficient threshold, and select the ring network box whose correlation coefficient with the target ring network box is not less than the preset correlation coefficient threshold as the observation ring network box; Extracting the operation response coefficient corresponding to the observation ring network box; Extracting the operation response coefficient corresponding to the target ring network box; Obtaining a comprehensive operation response coefficient using the operation response coefficient corresponding to the observation ring network box and the operation response coefficient corresponding to the target ring network box; The comprehensive operation response coefficient is obtained by the following formula: Among them, R c represents the comprehensive operation response coefficient; m represents the number of observation ring network boxes; R i G represents the operation response coefficient corresponding to the i-th observation ring network box; i represents the correlation coefficient corresponding to the ith observation ring network box; R x Indicates the operation response coefficient corresponding to the target ring network box; R b G represents the standard deviation of the operation response coefficient corresponding to m observation ring network boxes; b represents the standard deviation of the correlation coefficient corresponding to m observation ring network boxes; K represents the adjustment coefficient, and the adjustment coefficient is obtained by the following formula: Among them, K represents the adjustment coefficient; G max represents the maximum value of the correlation coefficient corresponding to m observation ring network boxes; R max It indicates the operation response coefficient of the observation ring network box corresponding to the maximum value of the correlation coefficient; R m G represents the maximum value of the operation response coefficient corresponding to m observation ring network boxes; m Indicates the correlation coefficient corresponding to the observation ring network box corresponding to the maximum value of the operation response coefficient; R x Indicates the operation response coefficient corresponding to the target ring network box; comparing the comprehensive operation response coefficient with a preset comprehensive coefficient threshold; When the comprehensive operation response coefficient exceeds a preset comprehensive coefficient threshold, it is determined that the transformer of the target ring network box has a response operation abnormality, and a response operation abnormality alarm is issued.

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