Sagomean intelligent power supply system based on wind-solar-diesel storage

Abstract

The invention relates to the technical field of energy storage systems, and discloses a wind-solar-diesel-storage-based Sagomean intelligent power supply system, which comprises a battery module, a heat management module, a connection management module and an intelligent regulation and control module, wherein the battery module is composed of N battery units which are arranged in a grid shape, and each battery unit comprises an energy storage battery; the battery module is used for storing electric energy of wind and light power generation and supplying power to a load; the heat management module is used for performing temperature monitoring and temperature regulation and control on the energy storage battery; the connection management module is used for controlling circuit connection of the energy storage battery, monitoring state parameters of the energy storage battery and carrying out fault detection on the energy storage battery; the intelligent regulation and control module is used for carrying out discharge strategy planning on the battery module; the overall performance of the energy storage power supply system in the wind-solar-diesel storage mode is improved, and a more stable, efficient and safer scheme is provided for effective utilization of renewable energy sources.

Description

Technical Field

[0001] The present invention relates to the technical field of energy storage systems, and in particular to a Shagohuang intelligent power supply system based on wind, solar, and diesel storage. Background Art

[0002] Traditional energy storage power sources have limitations in environmental adaptability and intelligent regulation. Especially under the extreme climatic conditions in the Shagohuang area, battery performance will decline, making it difficult for the power system to operate stably off the grid. Existing power supply systems used in Shagohuang areas usually adopt a relatively simple discharge strategy, which cannot fully utilize the state differences of different battery cells, resulting in limited overall system performance. Traditional energy storage systems mostly rely on manual intervention or simple automatic control systems, lack intelligent regulation capabilities, and are difficult to adapt to the complex and changing power supply and demand environment.

[0003] For example, a Chinese patent with authorization announcement number CN115800311B discloses an island wind, solar, diesel and storage power supply system and its control method. The island wind, solar, diesel and storage power supply system includes an energy management unit, a coordination controller, a distributed energy storage wind power generation unit, a distributed energy storage photovoltaic power generation unit, a centralized energy storage unit, and a diesel power generation unit. A step-by-step power output control method is proposed for power deviations of different amplitudes; based on the different component characteristics of the energy difference in the distributed energy storage system, a variety of charging and discharging mode switching methods for energy storage batteries are proposed. The technical solution of this invention can effectively smooth out the fluctuations in wind turbine / photovoltaic output power and AC bus voltage frequency, reduce the transient stress of the primary frequency modulation current of the centralized energy storage unit on the AC side, and the probability of overcurrent faults, thereby improving the stability of the entire power supply system, the utilization rate of renewable energy, and the service life of the energy storage battery.

[0004] For example, the patent application with publication number CN106602541A discloses a wind, solar, diesel and storage independent power supply coordination control system for communication base stations, including a wind turbine, a photovoltaic power generation array, a battery pack, a diesel generator set, a communication base station load, a microgrid monitoring system, a digital signal processor, an AC load and a controllable load. The power output end of the wind turbine is connected to the AC power input end of the first AC / DC converter, the DC power output end of the first AC / DC converter is connected to the input end of the first DC / DC converter, the power output end of the photovoltaic power generation array is connected to the input end of the second DC / DC converter, and the power output end of the diesel generator set is connected to the AC power input end of the second AC / DC converter. The invention targets the randomness and intermittency of natural resources such as wind and solar power and the load changes of communication base stations, and meets the continuous and stable power supply needs of communication base stations through coordinated control between wind and solar power generation units, energy storage devices and diesel engines.

[0005] The above patents all have the problem raised by this background technology: they cannot fully utilize the state differences of different battery cells, resulting in limited overall system performance.

[0006] The information disclosed in this background technology section is only intended to enhance the understanding of the overall background of the invention and should not be regarded as an acknowledgement or any form of suggestion that the information constitutes the prior art already known to ordinary technicians in this field. Summary of the invention

[0007] The technical problem to be solved by the present invention is to overcome the defects of the prior art and provide a Shagohuang intelligent power supply system based on wind, solar, diesel and storage to improve the overall performance of the energy storage power supply system in the wind, solar, diesel and storage mode. To solve the above technical problems, the present invention provides the following technical solutions:

[0008] A wind, solar, and diesel storage-based Shagohuang intelligent power system includes a battery module, a thermal management module, a connection management module, and an intelligent control module; wherein:

[0009] The battery module is composed of N battery cells, which are arranged in a grid shape, and each battery cell includes an energy storage battery; the battery module is used to store the electric energy generated by wind and solar power, and to supply power to the load;

[0010] The thermal management module is used to monitor and control the temperature of the energy storage battery;

[0011] The connection management module is used to control the circuit connection of each energy storage battery, monitor the state parameters of each energy storage battery, and perform fault detection on each energy storage battery based on temperature and state parameters;

[0012] The intelligent control module plans the discharge strategy for the battery module based on the temperature and state parameters of each energy storage battery.

[0013] As a preferred solution of the wind, solar, and diesel storage-based Shagohuang intelligent power supply system of the present invention, the thermal management module includes a temperature detection unit and a temperature control unit; wherein the temperature detection unit is configured with temperature sensors dispersed in each battery cell, which is used to detect the temperature of the energy storage battery in each battery cell in real time; the temperature control unit is configured with a foam extruded board, a heat sink, a fan, and a resistance heater, which is used to control the temperature of the energy storage battery in each battery cell, as follows:

[0014] The battery module is placed in the box, and the foam extruded board is arranged on the inner side of the box to insulate the battery module from the outside; the heat sink is installed on the surface of each energy storage battery, and the fan is placed inside the box, and the fan and the heat sink dissipate heat and cool the energy storage battery; each battery unit is equipped with a resistance heater to preheat the energy storage battery; the temperature detection unit is equipped with a first temperature control threshold and a second temperature control threshold. If the average temperature of all energy storage batteries is higher than the first temperature control threshold, the fan is started to cool the energy storage battery; if the average temperature of all energy storage batteries is lower than the second temperature control threshold, the resistance heater is started to preheat the energy storage battery.

[0015] As a preferred solution of the wind-solar-diesel-storage based Shagohuang intelligent power supply system of the present invention, wherein: the connection management module includes a battery status unit and a fault detection unit;

[0016] The battery status unit is used to collect the status parameters of each energy storage battery; the status parameters include SOC, SOH, internal resistance, number of cycles, and temperature;

[0017] The fault detection unit is configured with a normal threshold interval for each state parameter, and is used to perform fault detection on each energy storage battery; the fault detection unit receives and records each state parameter of each energy storage battery collected by the battery state unit, and determines whether each state parameter of each energy storage battery is within the corresponding normal threshold interval; if at least one state parameter of any energy storage battery is not within the corresponding normal threshold interval, the energy storage battery has a fault.

[0018] As a preferred solution of the Shagohuang intelligent power supply system based on wind, solar and diesel storage described in the present invention, the battery status unit is also used to detect the charging current and discharging current of each energy storage battery, and the fault detection unit is also configured with a charging current threshold and a discharging current threshold; if the charging current of any energy storage battery is higher than the charging current threshold or the discharging current is higher than the discharging current threshold, the energy storage battery is faulty.

[0019] As a preferred solution of the wind, solar, and diesel storage-based Shagohuang intelligent power supply system of the present invention, the battery status unit is also used to continuously detect the terminal voltage data of each energy storage battery and transmit it to the fault detection unit; the fault detection unit is also configured with a terminal voltage processing strategy and a fault detection strategy based on terminal voltage; the terminal voltage processing strategy is to organize the terminal voltage data of each energy storage battery into a terminal voltage sequence of each energy storage battery in chronological order; the fault detection strategy based on terminal voltage is specifically as follows:

[0020] The terminal voltage fluctuation index of each energy storage battery is calculated. If the terminal voltage fluctuation index is greater than a preset threshold, the energy storage battery is faulty. Otherwise, the energy storage battery is not faulty. The calculation formula of the terminal voltage fluctuation index is as follows:

[0021] ;

[0022] Wherein, f represents the terminal voltage fluctuation index of any energy storage battery; represents the fluctuation rate of the i-th terminal voltage of the energy storage battery; the value range of i is 2, 3, ..., n, where n is the sequence length of the terminal voltage sequence; represents the average value of n-1 terminal voltage fluctuation rates; the calculation formula of the terminal voltage fluctuation rate is as follows:

[0023] ;

[0024] in, Represents the i-th terminal voltage data in the terminal voltage sequence of the energy storage battery, Represents the i-1th terminal voltage data in the terminal voltage sequence of the energy storage battery.

[0025] As a preferred solution of the Shagohuang intelligent power supply system based on wind, solar and diesel storage described in the present invention, wherein: the connection management module also includes a connection control unit, which is used to control the circuit connection of each energy storage battery, and is used to control the charging switch and the discharging switch of each energy storage battery; when the fault detection unit detects that at least one energy storage battery has a fault, it sends a fault isolation instruction to the connection control unit, sends fault information to the intelligent control module, and sends a heat dissipation instruction to the temperature control unit; the connection control unit parses the fault isolation instruction, obtains the number of the faulty battery and isolates the faulty energy storage battery, disconnects the faulty battery from other batteries and the faulty battery from the charging circuit and the discharging circuit; the temperature control unit responds to the heat dissipation instruction, detects the working status of the fan, and if the fan is not started, starts the fan to dissipate heat for the battery module.

[0026] As a preferred solution of the Shagohuang intelligent power system based on wind, solar, and diesel storage described in the present invention, the intelligent control module includes a discharge strategy unit for planning the discharge strategy of the battery module, and the method is as follows:

[0027] Receive the status parameters of each energy storage battery collected by the battery status unit, and calculate the status index of each energy storage battery. The formula is as follows:

[0028] ;

[0029] Wherein, H represents the status index of any energy storage battery; R represents the internal resistance of the energy storage battery; Indicates the number of cycles of the energy storage battery; T indicates the temperature of the energy storage battery, Indicates the reference operating temperature of the energy storage battery; is the weight coefficient;

[0030] The discharge strategy unit is configured with a first state threshold and a second state threshold; the energy storage batteries whose state index is higher than the first state threshold are divided into a first battery group; the energy storage batteries whose state index is not higher than the first state threshold and higher than the second state threshold are divided into a second battery group; the energy storage batteries whose state index is not higher than the second state threshold are divided into a discarded battery group;

[0031] Performing a balance test on each energy storage battery in the first battery group; assigning energy storage batteries that fail the balance test to the second battery group;

[0032] A balance test is performed on the second battery group, and energy storage batteries that fail the balance test are classified into a discarded battery group.

[0033] As a preferred solution of the Shagohuang intelligent power supply system based on wind, solar, diesel and storage described in the present invention, the balance detection is specifically as follows:

[0034] The mean and standard deviation of each state parameter of each energy storage battery in the battery pack undergoing balance detection are calculated. If each state parameter of any energy storage battery satisfies the balance judgment formula, the energy storage battery passes the balance detection; otherwise, the energy storage battery fails the balance detection; the balance judgment formula is as follows:

[0035] ;

[0036] in, represents the jth state parameter of any energy storage battery; the value range of j is 1, 2, ..., m, m is the number of types of state parameters, and the value is 5; represents the mean value of the jth state parameter of all energy storage batteries in the battery pack; Represents the standard deviation of the jth state parameter of all energy storage batteries in the battery pack; Represents the balance coefficient of the jth state parameter of any energy storage battery.

[0037] As a preferred solution of the Shagohuang intelligent power supply system based on wind, solar, and diesel storage described in the present invention, wherein: the intelligent control module also includes a discharge control unit, which is used to control the battery module to start and end discharging; the method is as follows: real-time monitoring of the total power of wind and solar power generation and the load demand power; when the total power of wind and solar power generation is less than the load demand power, the discharge control unit sends a start discharge instruction to the discharge strategy unit, and the discharge strategy unit responds to the start discharge instruction and plans a discharge strategy; the discharge control unit parses the discharge strategy and sends a control instruction to the connection control unit, and the connection control unit controls the connection between the energy storage battery and the power supply bus based on the control instruction, and controls the energy storage battery to start and end discharging.

[0038] As a preferred solution of the wind-solar-diesel-storage based Shagohuang intelligent power supply system of the present invention, when the discharge control unit completes the analysis of the discharge strategy, the control instruction sent to the connection control unit is as follows: connect the energy storage battery of the first battery group to the power supply bus, disconnect the energy storage battery other than the first battery group from the power supply bus, and control the energy storage battery of the first battery group to start discharging;

[0039] The discharge control unit is configured with a discharge threshold; during the discharge process of the battery module, the discharge control unit receives the SOC of each energy storage battery sent by the battery status unit in real time. When the average SOC of the first battery group is lower than the discharge threshold, the discharge control unit sends the following control instructions to the connection control unit: the energy storage battery of the first battery group ends discharging, and the connection between the energy storage battery of the first battery group and the power supply bus is disconnected; the energy storage battery of the second battery group is connected to the power supply bus, and the energy storage battery of the second battery group is controlled to start discharging;

[0040] When the average SOC of the second battery pack is lower than the discharge threshold, the discharge control unit sends the following control instruction to the connection control unit: the energy storage battery of the second battery pack ends discharging, and the energy storage battery of the second battery pack is disconnected from the power supply bus.

[0041] Compared with the prior art, the beneficial effects achieved by the present invention are as follows:

[0042] The innovative use of multi-layer foam extruded boards and decentralized automated thermal management systems effectively solves the temperature control problem of the battery pack in the extreme environment of the Shago Desert, and improves the environmental adaptability of the system. Through precise temperature monitoring and regulation, the battery module is ensured to be within the optimal operating temperature range, effectively avoiding battery performance degradation and even safety accidents caused by excessively high or low temperatures. Fault detection and isolation at the battery cell level are achieved, which can quickly locate faulty batteries and take isolation measures to ensure the normal operation of the rest of the system and reduce the risk of overall system failure.

[0043] The system performs graded discharge according to the battery status parameters, giving priority to battery packs in good condition for discharge, thereby improving the energy efficiency of the system. Through balance detection, the internal state of the battery packs involved in the discharge is ensured to be consistent, avoiding the overall performance degradation caused by differences in the status of individual batteries, thereby extending the service life of the battery pack. Combined with battery status parameters and temperature information, the discharge strategy is automatically planned, reducing the need for manual intervention and improving the intelligence and response speed of the power supply system in the Shagohuang area. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. Among them:

[0045] Figure 1 A schematic diagram of the structure of the Shagohuang intelligent power supply system based on wind, solar, and diesel storage provided by the present invention;

[0046] Figure 2 A flow chart of the terminal voltage processing strategy provided by the present invention;

[0047] Figure 3 A flow chart of a method for planning a discharge strategy provided by the present invention;

[0048] Figure 4 This is a working principle diagram of the Shagohuang intelligent power supply system based on wind, solar, and diesel storage provided by the present invention. DETAILED DESCRIPTION

[0049] The technical solution of the present invention is described in detail below through the accompanying drawings and specific embodiments. It should be understood that the embodiments of the present invention and the specific features in the embodiments are detailed descriptions of the technical solution of the present invention, rather than limitations on the technical solution of the present invention. The embodiments of the present invention and the technical features in the embodiments may be combined with each other unless there is a conflict.

[0050] This embodiment introduces a wind, solar, and diesel storage-based Shagohuang intelligent power system. Figure 1 The system includes a battery module, a thermal management module, a connection management module, and an intelligent control module; wherein:

[0051] The battery module is composed of N battery cells, which are arranged in a grid shape, and each battery cell includes an energy storage battery; the battery module is used to store the electric energy generated by wind and solar power, and to supply power to the load;

[0052] Each battery unit can independently transmit the DC power of its energy storage battery to the power supply bus. The power supply bus collects the DC power of all the battery units connected to it and supplies power to the load.

[0053] The thermal management module is used to monitor and control the temperature of the energy storage battery; it includes a temperature detection unit and a temperature control unit; wherein the temperature detection unit is configured with temperature sensors dispersed in each battery cell, and is used to detect the temperature of the energy storage battery in each battery cell in real time; the temperature control unit is configured with a foam extruded plate, a heat sink, a fan, and a resistance heater, and is used to control the temperature of the energy storage battery in each battery cell, as follows:

[0054] The battery module is placed in the box; the box is used to store the battery module; the foam extruded board is arranged on the inner side of the box to insulate the battery module from the outside; the heat sink is installed on the surface of each energy storage battery, and the fan is placed inside the box, and the fan and the heat sink dissipate heat and cool the energy storage battery; each battery unit is equipped with a resistance heater to preheat the energy storage battery; the temperature detection unit is equipped with a first temperature control threshold and a second temperature control threshold. If the average temperature of all energy storage batteries is higher than the first temperature control threshold, the fan is started to cool the energy storage battery; if the average temperature of all energy storage batteries is lower than the second temperature control threshold, the resistance heater is started to preheat the energy storage battery.

[0055] The optimal operating temperature range of the battery is usually between 20 and 30 degrees Celsius. The use of multi-layer foam extrusion panels to maintain a stable temperature inside the battery module can prevent the impact of external temperature changes on battery performance. Heat sinks are usually made of materials with good thermal conductivity, such as aluminum or copper. The heat sink is directly installed on the surface of the energy storage battery to improve the heat dissipation efficiency of the energy storage battery by increasing the surface area. The fan accelerates the air flow to help the heat sink dissipate heat faster, which can cool down overheated energy storage batteries. The resistance heater heats the energy storage battery through the heat generated by the resistance element. In a low temperature environment, it can ensure that the battery will not be damaged when starting. Through the above configuration, the thermal management module can realize decentralized thermal management of each battery cell, automatically monitor and adjust the temperature of the energy storage battery, and ensure that the energy storage battery operates within the optimal temperature range.

[0056] The connection management module is used to control the circuit connection of each energy storage battery, monitor the state parameters of each energy storage battery, and perform fault detection on each energy storage battery based on temperature and state parameters; it includes a battery state unit, a fault detection unit, and a connection control unit;

[0057] The battery status unit is used to collect the status parameters of each energy storage battery; the status parameters include SOC, SOH, internal resistance, number of cycles, and temperature. Among them, the temperature is collected by the temperature detection unit, and the battery status unit is responsible for collecting other status parameters except temperature.

[0058] SOC indicates the percentage of the remaining charge in a battery as a percentage of its total capacity. By monitoring SOC, you can understand when the energy storage battery needs to be charged or discharged, and avoid safety issues caused by overcharging or over-discharging. SOH describes the ratio of the current performance of the battery to the performance of a new battery, which can help predict the remaining service life of the battery. A high SOH indicates that the energy storage battery is performing well, while a low SOH means that the energy storage battery may need maintenance or replacement. Internal resistance is a measure of the internal resistance of a battery, which affects the power output capability and thermal performance of the battery. As the battery ages, the internal resistance generally increases. By monitoring the changes in internal resistance, the degree of aging and potential failure risks of the energy storage battery can be assessed. The number of cycles refers to the number of times the battery is charged from full to empty and then full again. Generally speaking, the performance of an energy storage battery will drop significantly after the number of cycles exceeds a certain number.

[0059] The fault detection unit is configured with a normal threshold interval for each state parameter, and is used to perform fault detection on each energy storage battery; the fault detection unit receives and records each state parameter of each energy storage battery collected by the battery state unit, and determines whether each state parameter of each energy storage battery is within the corresponding normal threshold interval; if at least one state parameter of any energy storage battery is not within the corresponding normal threshold interval, the energy storage battery has a fault.

[0060] The battery status unit is also used to detect the charging current and discharging current of each energy storage battery, and the fault detection unit is also configured with a charging current threshold and a discharging current threshold; if the charging current of any energy storage battery is higher than the charging current threshold or the discharging current is higher than the discharging current threshold, the energy storage battery is faulty;

[0061] The battery status unit is also used to continuously detect the terminal voltage data of each energy storage battery and transmit it to the fault detection unit; the fault detection unit is also configured with a terminal voltage processing strategy and a fault detection strategy based on the terminal voltage; the terminal voltage processing strategy is as follows Figure 2 As shown, the details are as follows:

[0062] S1: Continuously record the terminal voltage data of each energy storage battery;

[0063] S2: Data cleaning of the terminal voltage data of each energy storage battery, including missing value filling, outlier detection and replacement;

[0064] S3: Arrange the terminal voltage data of each energy storage battery into a time series in chronological order as a terminal voltage series of each energy storage battery;

[0065] The fault detection strategy based on terminal voltage is as follows:

[0066] The terminal voltage fluctuation index of each energy storage battery is calculated. If the terminal voltage fluctuation index is greater than a preset threshold, the energy storage battery is faulty. Otherwise, the energy storage battery is not faulty. The calculation formula of the terminal voltage fluctuation index is as follows:

[0067] ;

[0068] Wherein, f represents the terminal voltage fluctuation index of any energy storage battery; represents the fluctuation rate of the i-th terminal voltage of the energy storage battery; the value range of i is 2, 3, ..., n, where n is the sequence length of the terminal voltage sequence; represents the average value of n-1 terminal voltage fluctuation rates; the calculation formula of the terminal voltage fluctuation rate is as follows:

[0069] ;

[0070] in, Represents the i-th terminal voltage data in the terminal voltage sequence of the energy storage battery, Represents the i-1th terminal voltage data in the terminal voltage sequence of the energy storage battery. As charging and discharging proceed, the terminal voltage of the energy storage battery changes relatively smoothly under normal circumstances. If the energy storage battery fails, the terminal voltage may fluctuate abnormally. The terminal voltage processing strategy and the fault detection strategy based on terminal voltage configured by the fault detection unit can detect abnormal fluctuations in the terminal voltage of each energy storage battery, thereby performing fault judgment based on the terminal voltage.

[0071] The connection control unit is used to control the circuit connection of each energy storage battery, and to control the charging switch and discharging switch of each energy storage battery; when the fault detection unit detects that at least one energy storage battery is faulty, it sends a fault isolation instruction to the connection control unit, sends fault information to the intelligent control module, and sends a heat dissipation instruction to the temperature control unit; the connection control unit parses the fault isolation instruction, obtains the number of the faulty battery, and performs fault isolation on the faulty energy storage battery, disconnects the faulty battery from other batteries and the faulty battery from the charging circuit and the discharging circuit; the temperature control unit responds to the heat dissipation instruction, detects the working status of the fan, and if the fan is not started, starts the fan to dissipate heat for the battery module. Through fault detection and fault isolation, when one or several energy storage batteries fail, the system can cut off their connection with the outside world, ensuring the stability of the system.

[0072] The intelligent control module performs discharge strategy planning for the battery module based on the temperature and state parameters of each energy storage battery, and includes a discharge control unit and a discharge strategy unit;

[0073] The discharge strategy unit is used to plan the discharge strategy of the battery module; the method refers to Figure 3 , as follows:

[0074] Receive the status parameters of each energy storage battery collected by the battery status unit, and calculate the status index of each energy storage battery. The formula is as follows:

[0075] ;

[0076] Wherein, H represents the status index of any energy storage battery; R represents the internal resistance of the energy storage battery; Indicates the number of cycles of the energy storage battery; T indicates the temperature of the energy storage battery, Indicates the reference operating temperature of the energy storage battery, that is, the optimal operating temperature of the energy storage battery; is the weight coefficient; and It is set by technicians in this field based on actual needs; SOC and SOH are generally percentages. When calculating the status index, the percentage is converted to a decimal, and the dimensions of internal resistance and temperature are not involved in the calculation.

[0077] The discharge strategy unit is configured with a first state threshold and a second state threshold; the energy storage batteries whose state index is higher than the first state threshold are divided into the first battery group; the energy storage batteries whose state index is not higher than the first state threshold and higher than the second state threshold are divided into the second battery group; the energy storage batteries whose state index is not higher than the second state threshold are divided into the abandoned battery group; when the battery module is needed to power the load, the first battery group with a better state is discharged first, and when the power of the first battery group is low, the second battery group with a general state is switched to discharge; the energy storage batteries in the abandoned battery group are in a poor state and do not participate in the discharge to prevent malfunctions. In this way, the energy storage batteries in good state can be used to power the load first, ensuring the stability and safety of the discharge.

[0078] Perform a balance test on each energy storage battery in the first battery group; and divide the energy storage batteries that fail the balance test into the second battery group; the balance test is specifically as follows:

[0079] The mean and standard deviation of each state parameter of each energy storage battery in the battery pack undergoing balance detection are calculated. If each state parameter of any energy storage battery satisfies the balance judgment formula, the energy storage battery passes the balance detection; otherwise, the energy storage battery fails the balance detection; the balance judgment formula is as follows:

[0080] ;

[0081] in, represents the jth state parameter of any energy storage battery; the value range of j is 1, 2, ..., m, m is the number of types of state parameters, and the value is 5; represents the mean value of the jth state parameter of all energy storage batteries in the battery pack; Represents the standard deviation of the jth state parameter of all energy storage batteries in the battery pack; The balance coefficient representing the j-th state parameter of any energy storage battery is set by technicians in this field based on actual needs.

[0082] A balance test is performed on the second battery group, and energy storage batteries that fail the balance test are classified into a discarded battery group.

[0083] The status index is calculated comprehensively by 5 status parameters. Although it can reflect the status of each energy storage battery to a large extent, there may be a situation where the status index of a certain energy storage battery is close to that of other batteries in the same group, but one or more of its status parameters are quite different from other batteries in the same group. This kind of battery is an unbalanced battery in the battery pack. When the energy storage batteries in the battery pack are discharged at the same time, the unbalanced battery may be unbalanced with other batteries due to the imbalance of status parameters, resulting in unstable power supply to the load by the battery pack. Therefore, the first battery pack that is discharged first is first tested for balance to find possible unbalanced batteries. However, since the unbalanced batteries in the first battery pack are in a better overall state, they are not directly classified as abandoned batteries, but are classified as spare discharge batteries in the second battery pack. Then, the second battery pack is tested for balance and the unbalanced batteries are discarded.

[0084] The discharge strategy unit is configured with the number and location information of each energy storage battery; if the fault information sent by the fault detection unit is received, the fault information is parsed to obtain the number and location information of the faulty battery, and the faulty battery and the energy storage battery adjacent to the faulty battery are classified into the abandoned battery group. The N battery cells of the battery module are arranged in a grid shape, and each energy storage battery can be regarded as a grid in the grid. The location information is the position of each energy storage battery in the grid. The energy storage batteries in the grid adjacent to the grid where the faulty battery is located are regarded as energy storage batteries adjacent to the faulty battery.

[0085] The discharge control unit is used to control the battery module to start discharging and end discharging; the method is as follows: real-time monitoring of the total power of wind and solar power generation and the load demand power; when the total power of wind and solar power generation is less than the load demand power, the discharge control unit sends a start discharge instruction to the discharge strategy unit, and the discharge strategy unit responds to the start discharge instruction and plans the discharge strategy; the discharge control unit parses the discharge strategy and sends a control instruction to the connection control unit, and the connection control unit controls the connection between the energy storage battery and the power supply bus based on the control instruction, and controls the energy storage battery to start discharging and end discharging;

[0086] When the discharge control unit completes parsing the discharge strategy, the control instruction sent to the connection control unit is as follows: connect the energy storage battery of the first battery group to the power supply bus, disconnect the energy storage battery other than the first battery group from the power supply bus, and control the energy storage battery of the first battery group to start discharging;

[0087] The discharge control unit is configured with a discharge threshold; during the discharge process of the battery module, the discharge control unit receives the SOC of each energy storage battery sent by the battery status unit in real time. When the average SOC of the first battery group is lower than the discharge threshold, the discharge control unit sends the following control instructions to the connection control unit: the energy storage battery of the first battery group ends discharging, and the connection between the energy storage battery of the first battery group and the power supply bus is disconnected; the energy storage battery of the second battery group is connected to the power supply bus, and the energy storage battery of the second battery group is controlled to start discharging;

[0088] When the average SOC of the second battery group is lower than the discharge threshold, the discharge control unit sends the following control instruction to the connection control unit: the energy storage battery of the second battery group ends discharging, and the energy storage battery of the second battery group is disconnected from the power supply bus. Figure 4 shown.

[0089] By setting the discharge threshold, when the battery module power drops to a certain level, the discharge is stopped to avoid over-discharge of the energy storage battery and extend the service life of the energy storage battery. When the total wind and solar power generation power is higher than the load demand power, the wind and solar power generation power is stored in the battery module; when the total wind and solar power generation power is lower than the load demand power and the battery module power is insufficient, the diesel generator is started to supply power to the load to maximize the use efficiency of clean energy.

[0090] The embodiments of the present invention are described above in conjunction with the accompanying drawings, but the present invention is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present invention, ordinary technicians in this field can also make many forms without departing from the purpose and scope of protection of the present invention, which are all within the protection of the present invention.

Claims

1. A wind, solar, and diesel-storage based Shagohuang intelligent power supply system, characterized by: It includes battery module, thermal management module, connection management module and intelligent control module; among which: The battery module is composed of N battery cells, which are arranged in a grid shape, and each battery cell includes an energy storage battery; the battery module is used to store the electric energy generated by wind and solar power, and to supply power to the load; The thermal management module is used to monitor and control the temperature of the energy storage battery; The connection management module is used to control the circuit connection of each energy storage battery, monitor the state parameters of each energy storage battery, and perform fault detection on each energy storage battery based on temperature and state parameters; The intelligent control module plans the discharge strategy for the battery module based on the temperature and state parameters of each energy storage battery.

2. The wind, solar, and diesel storage-based Shagohuang intelligent power supply system according to claim 1, characterized in that: The thermal management module includes a temperature detection unit and a temperature control unit; wherein the temperature detection unit is configured with temperature sensors dispersed in each battery cell, for real-time detection of the temperature of the energy storage battery in each battery cell; the temperature control unit is configured with a foam extruded plate, a heat sink, a fan, and a resistance heater, for temperature control of the energy storage battery in each battery cell, as follows: The battery module is placed in the box, and the foam extruded board is arranged on the inner side of the box to insulate the battery module from the outside; the heat sink is installed on the surface of each energy storage battery, and the fan is placed inside the box, and the fan and the heat sink dissipate heat and cool the energy storage battery; each battery unit is equipped with a resistance heater to preheat the energy storage battery; the temperature detection unit is equipped with a first temperature control threshold and a second temperature control threshold. If the average temperature of all energy storage batteries is higher than the first temperature control threshold, the fan is started to cool the energy storage battery; if the average temperature of all energy storage batteries is lower than the second temperature control threshold, the resistance heater is started to preheat the energy storage battery.

3. The wind, solar, and diesel storage-based Shagohuang intelligent power supply system according to claim 1, characterized in that: The connection management module includes a battery status unit and a fault detection unit; The battery status unit is used to collect the status parameters of each energy storage battery; the status parameters include SOC, SOH, internal resistance, number of cycles, and temperature; The fault detection unit is configured with a normal threshold interval for each state parameter, and is used to perform fault detection on each energy storage battery; the fault detection unit receives and records each state parameter of each energy storage battery collected by the battery state unit, and determines whether each state parameter of each energy storage battery is within the corresponding normal threshold interval; if at least one state parameter of any energy storage battery is not within the corresponding normal threshold interval, the energy storage battery has a fault.

4. The wind, solar, and diesel storage-based Shagohuang intelligent power supply system as claimed in claim 3, characterized in that: The battery status unit is also used to detect the charging current and discharging current of each energy storage battery, and the fault detection unit is also configured with a charging current threshold and a discharging current threshold; if the charging current of any energy storage battery is higher than the charging current threshold or the discharging current is higher than the discharging current threshold, the energy storage battery is faulty.

5. The wind, solar, and diesel storage-based Shagohuang intelligent power supply system as claimed in claim 4, characterized in that: The battery status unit is also used to continuously detect the terminal voltage data of each energy storage battery and transmit it to the fault detection unit; the fault detection unit is also configured with a terminal voltage processing strategy and a fault detection strategy based on the terminal voltage; the terminal voltage processing strategy is to sort the terminal voltage data of each energy storage battery into a terminal voltage sequence of each energy storage battery in chronological order; the fault detection strategy based on the terminal voltage is specifically as follows: The terminal voltage fluctuation index of each energy storage battery is calculated. If the terminal voltage fluctuation index is greater than a preset threshold, the energy storage battery is faulty. Otherwise, the energy storage battery is not faulty. The calculation formula of the terminal voltage fluctuation index is as follows: ； Wherein, f represents the terminal voltage fluctuation index of any energy storage battery; represents the fluctuation rate of the i-th terminal voltage of the energy storage battery; the value range of i is 2, 3, ..., n, where n is the sequence length of the terminal voltage sequence; represents the average value of n-1 terminal voltage fluctuation rates; the calculation formula of the terminal voltage fluctuation rate is as follows: ； in, Represents the i-th terminal voltage data in the terminal voltage sequence of the energy storage battery, Represents the i-1th terminal voltage data in the terminal voltage sequence of the energy storage battery.

6. The wind, solar, and diesel storage-based Shagohuang intelligent power supply system as claimed in claim 5, characterized in that: The connection management module also includes a connection control unit, which is used to control the circuit connection of each energy storage battery and to control the charging switch and the discharging switch of each energy storage battery; when the fault detection unit detects that at least one energy storage battery has a fault, it sends a fault isolation instruction to the connection control unit, sends fault information to the intelligent control module, and sends a heat dissipation instruction to the temperature control unit; The connection control unit parses the fault isolation instruction, obtains the number of the faulty battery and isolates the faulty energy storage battery, disconnects the faulty battery from other batteries and the faulty battery from the charging circuit and the discharging circuit; the temperature control unit responds to the heat dissipation instruction, detects the working status of the fan, and if the fan is not started, starts the fan to dissipate heat for the battery module.

7. The wind, solar, and diesel storage-based Shagohuang intelligent power supply system according to claim 6, characterized in that: The intelligent control module includes a discharge strategy unit, which is used to plan the discharge strategy of the battery module. The method is as follows: Receive the status parameters of each energy storage battery collected by the battery status unit, and calculate the status index of each energy storage battery. The formula is as follows: ； Wherein, H represents the status index of any energy storage battery; R represents the internal resistance of the energy storage battery; Indicates the number of cycles of the energy storage battery; T indicates the temperature of the energy storage battery, Indicates the reference operating temperature of the energy storage battery; is the weight coefficient; The discharge strategy unit is configured with a first state threshold and a second state threshold; the energy storage batteries whose state index is higher than the first state threshold are divided into a first battery group; the energy storage batteries whose state index is not higher than the first state threshold and higher than the second state threshold are divided into a second battery group; the energy storage batteries whose state index is not higher than the second state threshold are divided into a discarded battery group; Performing a balance test on each energy storage battery in the first battery group; assigning energy storage batteries that fail the balance test to the second battery group; A balance test is performed on the second battery group, and energy storage batteries that fail the balance test are classified into a discarded battery group.

8. The wind, solar, and diesel storage-based Shagohuang intelligent power supply system as claimed in claim 7, characterized in that: The balance test is as follows: The mean and standard deviation of each state parameter of each energy storage battery in the battery pack undergoing balance detection are calculated. If each state parameter of any energy storage battery satisfies the balance judgment formula, the energy storage battery passes the balance detection; otherwise, the energy storage battery fails the balance detection; the balance judgment formula is as follows: ； in, represents the jth state parameter of any energy storage battery; the value range of j is 1, 2, ..., m, m is the number of types of state parameters, and the value is 5; represents the mean value of the jth state parameter of all energy storage batteries in the battery pack; Represents the standard deviation of the jth state parameter of all energy storage batteries in the battery pack; Represents the balance coefficient of the jth state parameter of any energy storage battery.

9. The wind, solar, and diesel storage-based Shagohuang intelligent power supply system as claimed in claim 7, characterized in that: The intelligent control module also includes a discharge control unit, which is used to control the battery module to start and end discharging; the method is as follows: real-time monitoring of the total power of wind and solar power generation and the load demand power; when the total power of wind and solar power generation is less than the load demand power, the discharge control unit sends a start discharge instruction to the discharge strategy unit, and the discharge strategy unit responds to the start discharge instruction and plans a discharge strategy; the discharge control unit parses the discharge strategy and sends a control instruction to the connection control unit, and the connection control unit controls the connection between the energy storage battery and the power supply bus based on the control instruction, and controls the energy storage battery to start and end discharging.

10. The wind, solar, and diesel storage-based Shagohuang intelligent power supply system as claimed in claim 9, characterized in that: When the discharge control unit completes parsing the discharge strategy, the control instruction sent to the connection control unit is as follows: connect the energy storage battery of the first battery group to the power supply bus, disconnect the energy storage battery other than the first battery group from the power supply bus, and control the energy storage battery of the first battery group to start discharging; The discharge control unit is configured with a discharge threshold; during the discharge process of the battery module, the discharge control unit receives the SOC of each energy storage battery sent by the battery status unit in real time. When the average SOC of the first battery group is lower than the discharge threshold, the discharge control unit sends the following control instructions to the connection control unit: the energy storage battery of the first battery group ends discharging, and the connection between the energy storage battery of the first battery group and the power supply bus is disconnected; the energy storage battery of the second battery group is connected to the power supply bus, and the energy storage battery of the second battery group is controlled to start discharging; When the average SOC of the second battery pack is lower than the discharge threshold, the discharge control unit sends the following control instruction to the connection control unit: the energy storage battery of the second battery pack ends discharging, and the energy storage battery of the second battery pack is disconnected from the power supply bus.

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