Thermal power plant storage battery system supporting multiple working modes and control method thereof

Abstract

The invention discloses a thermal power plant storage battery system supporting multiple working modes and a control method thereof, and the system comprises a power transmission subsystem which comprises a first storage battery, a second storage battery, a bidirectional inverter, an AC bus, and a thermal power plant external power grid; wherein the first storage battery and the second storage battery are respectively connected with an external power grid of a thermal power plant through a bidirectional inverter and an alternating current bus; and the signal transmission subsystem comprises a communication center, a data storage module, a data processing module, a storage battery state monitoring module and a power transmission module. The health state of the storage battery is monitored in real time through the storage battery state monitoring module, the working parameters of the storage battery are dynamically adjusted through intelligent diagnosis and optimization strategies, the service life of the storage battery is prolonged, and the overall stability and safety of the system are ensured. The comprehensive performance and reliability of the thermal power plant in power grid frequency modulation, security power supply and black start are improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of power system design and control, and in particular relates to a thermal power plant battery system supporting multiple working modes and a control method thereof. Background Art

[0002] In the field of power systems, with the large-scale grid connection of new energy sources such as wind and solar energy, grid frequency regulation faces more stringent requirements. The intermittent and unpredictable nature of new energy sources poses a challenge to the stability of the power grid. In order to meet this challenge, traditional thermal power units are widely used in grid frequency regulation, but due to their slow frequency regulation response speed and low accuracy, they often cannot meet the needs of modern power grids for fast and accurate frequency regulation. Therefore, seeking more efficient frequency regulation technology has become the key to the development of power systems.

[0003] Although thermal power units play an important role in the power grid, their limitations in frequency regulation are gradually becoming apparent. The frequency regulation response time of thermal power units is long and the regulation accuracy is limited, which makes them unable to cope with the rapid changes in the power grid frequency. In addition, the frequency regulation efficiency of thermal power units is low and it is difficult to adapt to the high requirements of the power grid for frequency regulation speed and accuracy. In thermal power plants, although battery systems are used as a safety power supply to ensure critical backup support when the main power supply fails, and as a black start power supply to quickly restore power supply in the event of a complete power outage, these functions have not yet been effectively integrated with the frequency regulation needs of thermal power units. Summary of the invention

[0004] To solve the above technical problems, the present invention proposes a thermal power plant battery system supporting multiple working modes and a control method thereof, and improves the efficiency and response speed of power grid frequency modulation by designing and managing battery systems with multiple working modes in a thermal power plant.

[0005] To achieve the above objectives, in a first aspect, the present invention provides a thermal power plant battery system supporting multiple working modes, comprising:

[0006] The power transmission subsystem includes: a first storage battery, a second storage battery, a bidirectional inverter, an AC bus, and a power grid outside the thermal power plant; wherein the first storage battery and the second storage battery are connected to the power grid outside the thermal power plant through the bidirectional inverter and the AC bus, respectively;

[0007] Signal transmission subsystem, including: communication center, data storage module, data processing module, battery status monitoring module, power transmission module;

[0008] Among them, the first battery is monitored by the battery status monitoring module to obtain monitoring information, and the monitoring information is transmitted to the data storage module. The monitoring information in the data storage module is processed by the data processing module to obtain the working status of the first battery; if the working status is normal, the first working mode is executed on the external power grid through the communication center; if the working status is abnormal, the first battery is isolated through the communication center, and the second working mode is executed through the second battery; if the second battery is used as the power source of the third working mode, the power supply situation in the factory is monitored in real time through the power transmission module.

[0009] Preferably, the first working mode is a frequency regulation mode of the external power grid;

[0010] The first working mode is a frequency regulation mode when the second storage battery is used as a safety power supply;

[0011] The third working mode is a mode in which the second storage battery supplies power to key equipment in the thermal power plant.

[0012] Preferably, the battery status monitoring module includes an acoustic emission sensor, a fiber Bragg grating sensor, an electrochemical impedance spectroscopy sensor, a multi-band infrared imaging sensor and a gas sensor array.

[0013] Preferably, the power transmission module includes a temperature sensor, a resistance sensor and a vibration sensor.

[0014] In a second aspect, the present invention further provides a control method for a thermal power plant battery system supporting multiple working modes, comprising the following steps:

[0015] After receiving the frequency modulation demand signal through the communication center, detecting the working state of the first storage battery;

[0016] Determining, by a data processing module, whether the working state of the first storage battery supports frequency modulation;

[0017] If frequency modulation is supported, the first working mode is used to modulate the frequency of the external power grid;

[0018] If a battery failure occurs in a thermal power plant, the second working mode is used to adjust the frequency of the external power grid;

[0019] If a power outage occurs in the thermal power plant, the third working mode will be used to supply power.

[0020] Preferably, using the first working mode to modulate the frequency of the external power grid includes:

[0021] S1: Set the frequency modulation dead zone of the first battery to , detect whether the grid frequency deviation |Δf| exceeds the frequency regulation dead zone; when |Δf|< When |Δf|> When the first battery is enabled to perform frequency modulation, step S2 is executed;

[0022] S2: Detect whether the grid frequency deviation Δf is greater than zero; if Δf>0, proceed to step S3; if Δf<0, proceed to step S6;

[0023] S3: Settings is the threshold for switching between primary frequency modulation and secondary frequency modulation; when Δf>0, check whether Δf exceeds f3; if Δf>f3, execute step S4; if Δf<f3, execute step S5;

[0024] S4: When Δf> When the frequency deviation Δf and the frequency change rate d(Δf) / dt are used, the MPC prediction model is used to predict the future frequency change trend and calculate the optimal power output adjustment path to restore the frequency to the critical value. within the scope of

[0025] S5: When Δf< When the frequency is high, a hierarchical control strategy is used to adjust the power in a short time through the fast response layer to suppress the frequency fluctuation, and the power is dispatched in a long time through the optimization layer to gradually adjust the output of the first battery to ensure that the frequency is restored to the regulation range;

[0026] S6: When Δf<0, check whether Δf is lower than - ; If Δf<- , execute step S7; if Δf>- , execute step S8;

[0027] S7: When Δf<- When the frequency is restored to the critical value, the optimal power distribution control is adopted to calculate the optimal output ratio of each frequency modulation unit according to the current frequency deviation Δf and the remaining power of the first battery. within the scope of

[0028] S8: Based on whether the remaining power of the first storage battery is lower than , using a hierarchical control strategy to perform step-by-step power adjustments to ensure that the frequency is restored to the regulation range;

[0029] S9: When d(Δf) / dt is greater than zero, the frequency deviation change rate is adjusted and superimposed on the energy storage active control loop through the MPC prediction model to ensure stable frequency recovery; when d(Δf) / dt is less than zero, the system frequency is restored through the fast response layer of the hierarchical control strategy;

[0030] S10: If the SOC value is less than When the SOC value is greater than When the frequency deviation Δf is adjusted to within the dead zone, the frequency modulation stability of the system is maintained by using the optimization layer of the hierarchical control strategy.

[0031] In a third aspect, the present invention further discloses a computer device, comprising a memory, a processor, and a computer program stored in the memory, wherein the processor executes the computer program to implement the steps of the method described in the second aspect.

[0032] In a fourth aspect, the present invention further discloses a computer-readable storage medium having a computer program stored thereon, which implements the steps of the method described in the second aspect when executed by a processor.

[0033] In a fifth aspect, the present invention further discloses a computer program product, including a computer program, which implements the steps of the method described in the second aspect when executed by a processor.

[0034] Compared with the prior art, the present invention has the following advantages and technical effects:

[0035] The present invention provides a thermal power plant battery system supporting multiple working modes, comprising: a power transmission subsystem, comprising: a first battery, a second battery, a bidirectional inverter, an AC bus, and a power grid outside the thermal power plant; wherein the first battery and the second battery are connected to the power grid outside the thermal power plant through the bidirectional inverter and the AC bus, respectively; a signal transmission subsystem, comprising: a communication center, a data storage module, a data processing module, a battery status monitoring module, and a power transmission module; wherein the first battery is monitored by the battery status monitoring module to obtain monitoring information, and the monitoring information is transmitted to the data storage module, and the monitoring information in the data storage module is processed by the data processing module to obtain the working state of the first battery; if the working state is normal, the first working mode is executed on the external power grid through the communication center; if the working state is abnormal, the first battery is isolated through the communication center, and the second working mode is executed through the second battery; if the second battery is used as the power source of the third working mode, the power supply in the plant area is monitored in real time through the power transmission module.

[0036] The present invention monitors the health status of the battery in real time through the battery status monitoring module, and dynamically adjusts the working parameters of the battery through intelligent diagnosis and optimization strategies, thereby extending the battery life and ensuring the overall stability and safety of the system. When a failure occurs in the battery system, it automatically switches to the safety power supply mode, and activates the second battery to continue to ensure the stable operation of the power grid. When a large-scale power failure occurs in a thermal power plant, the system enters the third working mode, and gradually restores the normal operation of the thermal power plant by giving priority to powering key equipment. The present invention improves the comprehensive performance and reliability of thermal power plants in power grid frequency modulation, safety power supply and black start. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The drawings constituting a part of the present application are used to provide a further understanding of the present application. The illustrative embodiments and descriptions of the present application are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0038] Figure 1 A schematic diagram of the system structure of an embodiment of the present invention;

[0039] Figure 2 The figure is a flow chart of a control method according to an embodiment of the present invention. DETAILED DESCRIPTION

[0040] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0041] It should be noted that the steps shown in the flowcharts of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and that, although a logical order is shown in the flowcharts, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0042] Embodiment 1

[0043] This embodiment provides a thermal power plant battery system supporting multiple working modes, including:

[0044] The power transmission subsystem includes: a first storage battery, a second storage battery, a bidirectional inverter, an AC bus, and a power grid outside the thermal power plant; wherein the first storage battery and the second storage battery are connected to the power grid outside the thermal power plant through the bidirectional inverter and the AC bus, respectively;

[0045] Signal transmission subsystem, including: communication center, data storage module, data processing module, battery status monitoring module, power transmission module;

[0046] Among them, the first battery is monitored by the battery status monitoring module to obtain monitoring information, and the monitoring information is transmitted to the data storage module. The monitoring information in the data storage module is processed by the data processing module to obtain the working status of the first battery; if the working status is normal, the first working mode is executed on the external power grid through the communication center; if the working status is abnormal, the first battery is isolated through the communication center, and the second working mode is executed through the second battery; if the second battery is used as the power source of the third working mode, the power supply situation in the factory is monitored in real time through the power transmission module.

[0047] Specifically, Figure 1 As shown, the dotted line is the signal transmission line; the solid line is the power transmission line. The communication center controls the first battery to adjust the frequency by transmitting signals, and monitors the battery status through the data processing module and the data storage module. All batteries are connected to the AC bus of the thermal power plant through a bidirectional inverter, thereby realizing the frequency regulation function of the external power grid; the sensor array in the battery status monitoring module will collect data and send it to the communication center. Once the working state of the first battery is detected to be abnormal, the first battery will be isolated and the second battery will be used as a safety power supply to ensure the frequency regulation function. In addition to being a safety power supply, the second battery is also used as a power source in the black start mode. The power supply in the plant area is monitored in real time through the power transmission module between it and the plant area.

[0048] In this embodiment, the system judgment logic is as follows: after receiving the signal of frequency modulation demand, the system sends the signal to the battery status monitoring module through the communication center, and the battery status monitoring module and the data processing module judge the current state of the battery. If the current state of the first battery is normal, the first working mode is enabled; if the battery status monitoring module alarms or determines that the current state of the battery is faulty, the second working mode is enabled; if a large-scale power failure occurs in the factory area, the power transmission module switches the power line to the security power supply and enables the third working mode. The second working mode and the third working mode are abnormal states, and the first working mode is normal.

[0049] If the system is not in an abnormal state such as the second working mode and the third working mode, the first working mode is enabled according to the judgment logic to adjust the power system frequency.

[0050] (1) First working mode:

[0051] S1: FM dead zone setting and frequency deviation detection;

[0052] First, the frequency regulation dead zone value of the battery system needs to be set as a variable , and monitor the actual frequency of the power grid in real time. By calculating the absolute value of the frequency deviation |Δf|, it is determined whether it exceeds the set frequency regulation dead zone range. When |Δf| is less than When |Δf| exceeds When the power is on, the battery system is started to perform a frequency regulation, and the subsequent step S2 is executed.

[0053] In the first working mode Set to 0.03Hz.

[0054] S2: frequency deviation direction judgment;

[0055] In this step, the system determines the positive or negative value of the detected frequency deviation Δf. If Δf is a positive value, it means that the current frequency is higher than the rated value, and then the process goes to step S3; if Δf is a negative value, it means that the frequency is lower than the rated value, and then the process goes directly to step S6.

[0056] S3: Determination of the primary and secondary frequency modulation switching threshold;

[0057] When the frequency deviation Δf is positive, the switching threshold between primary frequency modulation and secondary frequency modulation needs to be set. When Δf is greater than When , execute step S4; if Δf is less than , then continue to step S5.

[0058] In the first working mode Set to 0.04Hz

[0059] S4: Power output regulation based on model predictive control;

[0060] When the frequency deviation Δf exceeds the set switching threshold The system uses the Model Predictive Control (MPC) method to adjust the power output of the battery. MPC predicts the frequency change trend at future moments and calculates an optimal power output adjustment path in advance to ensure that the frequency can quickly recover to the critical value. The method uses the real-time frequency deviation Δf and its change rate d(Δf) / dt to predict the future frequency deviation and dynamically adjust the battery output to achieve rapid frequency recovery.

[0061] S5: Application of hierarchical control strategy;

[0062] When the frequency deviation Δf is positive but does not exceed When the frequency deviation is When the frequency is within the range but has not yet fully recovered, the fast response layer is responsible for short-term power adjustment to quickly suppress frequency fluctuations; while the optimization layer gradually adjusts the battery output through power scheduling over a longer time frame to ensure that the frequency remains stable while recovering to the regulation range.

[0063] S6: Processing of negative frequency deviation;

[0064] When the frequency deviation Δf is negative, the switching threshold between primary frequency modulation and secondary frequency modulation also needs to be set. When Δf is less than - In the case of, execute step S7; if Δf is - to 0, continue to execute step S8.

[0065] S7: Implementation of optimal power allocation control;

[0066] When the frequency deviation Δf is lower than In the case of , the system uses the optimal power distribution control strategy for regulation. By optimizing the power distribution between the battery output and other power generation units, the frequency recovery time is minimized. This control strategy calculates the optimal output ratio of each frequency regulation unit based on the current frequency deviation Δf and the remaining battery power SOC to ensure that the frequency is restored to the critical value within the range.

[0067] S8: step-by-step power adjustment of hierarchical control strategy;

[0068] If the frequency deviation Δf is in - and 0, the system makes a judgment based on the remaining battery power SOC. When the frequency reaches the upper limit, the system uses a hierarchical control strategy to gradually adjust the power output to ensure that the frequency can be stably restored to the regulation range.

[0069] In the first working mode Set to 0.4.

[0070] S9: Adjustment of frequency deviation change rate;

[0071] When the frequency deviation change rate d(Δf) / dt is positive, the system superimposes the adjusted frequency deviation change rate into the active control loop of the energy storage system through the MPC prediction model to ensure stable frequency recovery; when d(Δf) / dt is negative, the system accelerates the frequency recovery process through the fast response layer in the hierarchical control strategy.

[0072] S10: Power optimization adjustment based on battery status;

[0073] In the last step, when the SOC value is lower than When the SOC value exceeds , the optimization layer in the hierarchical control strategy is used to adjust the frequency deviation Δf to within the frequency modulation dead zone to ensure the frequency modulation stability of the system.

[0074] In the first working mode Set to 0.7.

[0075] (2) Second working mode:

[0076] When the battery system is unable to continue to perform normal frequency regulation tasks due to a fault, the system will automatically switch to the safety power mode. In this mode, the system's primary task is to isolate the faulty battery and quickly switch to the backup safety battery module to continue to provide frequency regulation support for the power grid. The design goal is to ensure that the power grid can still maintain stable operation during a battery failure, while minimizing the impact of the fault expansion on the entire system.

[0077] like Figure 2 As shown in the figure, the system first relies on a multi-sensor integrated state monitoring module to continuously monitor the health status of the battery. The battery state monitoring module contains acoustic emission sensors, fiber Bragg grating sensors, electrochemical impedance spectroscopy analysis sensors, multi-band infrared imaging sensors, and gas sensor arrays. After collecting real-time data, the communication module transmits the data to the data processing module and storage module for data processing and storage. While the system covers traditional detection methods such as sensor arrays, it also introduces advanced adaptive monitoring technology and dynamic model prediction models based on artificial intelligence. The model can predict possible failure risks based on historical operating data and real-time monitoring data, and provide early warnings before failures occur.

[0078] In the second working mode, the acoustic emission sensor has a measurement range of 0.1-2MHz, a sensitivity of 75dB@1kHz, a resolution of 1dB, and an operating temperature of -20°C-85°C.

[0079] In the second working mode, the measurement range of the fiber Bragg grating sensor is -40°C-120°C, 0-1000µε, the sensitivity is 10pm / °C, 1pm / µε, the resolution is 0.01°C, 0.1µε, the working temperature is -40°C-120°C, and the wavelength range is 1510-1590nm.

[0080] In the second working mode, the frequency range of the electrochemical impedance spectroscopy analysis equipment is 10µHz-10MHz, the impedance range is 1mΩ-10MΩ, the accuracy is ±0.1%, and the working temperature is 0°C-50°C.

[0081] In the second working mode, the wavelength range of the multi-band infrared imaging technology equipment is 3-5µm (medium wave infrared) and 8-14µm (long wave infrared), the resolution is 640x480 pixels, the sensitivity is <50mK@30°C, the frame rate is 60Hz, and the operating temperature is 20°C-60°C.

[0082] In the second working mode, the gas sensor array can detect gases such as H2, CO2, CO, CH4, O2, etc., with a sensitivity of 1ppm, a response time of <15s, and an operating temperature of 20°C-50°C.

[0083] In the second working mode, the communication module transmission rate is 1Mbps, the communication mode is wireless (Wi-Fi, ZigBee) or wired (Ethernet, RS485), and the working temperature is 0°C-85°C.

[0084] In the second working mode, the edge computing unit processor is Quad-core ARM Cortex-A53, the memory is 4GB RAM, the storage is 64GB eMMC, and the operating system is Linux-based OS.

[0085] When a signal of a possible battery failure is detected, the system will immediately execute the fault isolation procedure. This process is quickly transmitted to the communication center through a high-speed data communication network. After receiving the fault signal, the control communication center will quickly command the battery isolation operation and notify the second battery system to prepare to take over the frequency regulation task of the power grid.

[0086] When the faulty battery is isolated, the system automatically activates the backup safety battery module. The safety battery module uses a built-in intelligent scheduling algorithm to dynamically adjust the output power according to the current grid frequency requirements, load changes, and the capacity of the second battery to ensure the stability of the grid frequency.

[0087] In order to improve the response speed of the switching process, the system is designed with a fast switching mechanism, that is, when the battery isolation signal is triggered, the second battery will start with the preset minimum power output, and then gradually increase to the required power level. This mechanism not only reduces the impact on the power grid during the switching process, but also restores the frequency regulation function in the shortest time. In addition, the system also introduces a load priority management function to allocate the output power of the security battery according to the importance and urgency of the load, thereby ensuring the continuous operation of critical loads under limited battery capacity.

[0088] After the security battery module takes over, the system will enter the fault management stage. In this stage, the faulty battery (first battery) will be transferred to a dedicated maintenance module for further inspection and repair. The system will use remote diagnostic technology and a cloud-based collaborative analysis platform to conduct a detailed analysis of the faulty battery, identify the cause of the fault, and develop a repair plan. In this way, the system can not only quickly restore the operating status of the faulty battery, but also improve the accuracy of future fault prediction and management through data accumulation and analysis.

[0089] After the fault is repaired and the battery is confirmed to be back to normal operation, the system will gradually transfer the frequency regulation task back to the first battery, and the security battery module will return to standby mode, waiting for the next possible emergency task. This process is managed by the dynamic balance control module in the system to ensure that there will be no fluctuations in the grid frequency during the battery switching process.

[0090] Finally, the system will perform optimization and strategy adjustments. Through data analysis of the entire fault handling process, the system will continuously optimize the fault detection algorithm and battery management strategy. Especially during the battery repair process, the system will use fault data and environmental parameters to recalibrate the fault prediction model to improve future response speed and accuracy. At the same time, the system will also evaluate the use of the second battery and adjust the charging and discharging strategy of the security battery according to the actual situation to ensure that it is always in the best condition.

[0091] This mode ensures that the power grid can continue to operate stably in the event of a failure in the first battery system through efficient fault detection and isolation, intelligent security battery management, and refined fault handling and strategy optimization.

[0092] (3) The third working mode:

[0093] Black start mode is a strategy designed to deal with emergencies caused by large-scale power failures within a thermal power plant. Black start mode is activated when the power system of a thermal power plant encounters a serious failure, resulting in a regular power outage, or even inability to restore power with external power. In this case, the system will prioritize the power supply of key equipment and important systems based on the pre-set priorities of different systems to ensure that the entire thermal power plant can gradually resume normal operation. The core goal of this mode is to maintain the normal operation of key equipment through the second battery and stably support the entire black start process until external power supply is restored.

[0094] When a large-scale power failure occurs in a thermal power plant, the system first relies on the power transmission module to monitor the power transmission status of each key point in real time. The power transmission module integrates a variety of advanced sensors, such as temperature sensors for wires and transformers, equipment deformation sensors, vibration sensors, leakage current sensors, and dielectric loss factor sensors. These sensors can collect data such as temperature, current, voltage, vibration, etc. of equipment and lines in real time, ensuring that the system can quickly capture any potential fault signals.

[0095] In the third working mode, the measuring range of the wire and transformer temperature sensor is -40°C-150°C, the sensitivity is 0.1°C, the accuracy is ±0.5°C, and the response time is <5 seconds.

[0096] In the third working mode, the measurement range of the equipment deformation sensor model is 0-5mm, the accuracy is ±0.01mm, the response time is <1 second, and the working temperature is 0°C-85°C.

[0097] In the third working mode, the vibration sensor has a measurement range of 0-50g, a frequency range of 1Hz-10kHz, an accuracy of ±0.02g, a sensitivity of 100mV / g, and an operating temperature of -40°C-105°C.

[0098] In the third working mode, the leakage current sensor has a measurement range of 0-500mA, a sensitivity of 1mA, an accuracy of ±0.5%, a response time of <10ms, and an operating temperature of 0°C-70°C.

[0099] In the third working mode, the dielectric loss factor sensor has a measurement range of 0-10%, an accuracy of ±0.05%, an operating temperature of 0°C-80°C, and a response time of <2 seconds.

[0100] In the third working mode, the communication module transmission rate is 1.5Mbps, the communication mode is wireless (Wi-Fi, LoRa) or wired (Ethernet, RS485), and the working temperature is 0°C-85°C.

[0101] In the third working mode, the data processing module processor is Quad-core ARM Cortex-A55, the memory is 8GB RAM, the storage is 128GB SSD, and the operating system is Linux-based OS.

[0102] When the sensor detects abnormal data, the data will be transmitted to the data processing module through the high-speed communication module. In the data processing module, the multimodal data will first be classified, integrated, and preliminarily calculated so that the system can identify the nature and severity of the abnormal signal in the shortest time. For example, when the temperature sensor detects that the temperature change rate exceeds the preset threshold, the system will generate a preliminary over-temperature warning signal; if the temperature continues to rise above the second temperature threshold, the system will trigger a higher level of over-temperature alarm signal, which can give the outside world time to activate the relevant response mechanism to prevent further damage to the equipment.

[0103] The first temperature threshold in the third working mode Set to 75°C, the second temperature threshold Set to 90°C, leakage current warning threshold Set to 30mA,

[0104] After completing the initial anomaly detection, the system enters the equipment health status assessment phase. The data processing module will comprehensively analyze the data provided by various sensors, including the resistance value change of the leakage current sensor, the value of the dielectric loss factor sensor, and the vibration amplitude of the vibration sensor. Through the comprehensive analysis of these data, the system can determine whether the equipment has serious insulation degradation, mechanical failure or other potential electrical problems.

[0105] The dielectric loss factor safety threshold in the third working mode Set to 0.05, the primary vibration threshold Set to 2g, secondary vibration threshold Set to 5g, insulation resistance drop threshold Set to 1 MΩ.

[0106] If the system detects that the insulation layer of the equipment may be aged or damaged, or the vibration amplitude reaches the standard of the early warning signal, the data processing module will automatically generate a relevant fault alarm and start the fault isolation procedure. This procedure includes isolating equipment that may cause a larger-scale fault and adjusting the power supply path of the backup power supply to ensure that critical systems can still obtain continuous power supply.

[0107] After confirming that there is a serious power failure in the thermal power plant and that it may endanger the stability of the entire power system, the system will officially activate the black start mode. The core of the black start mode is to sort the priorities of various systems in the plant and provide priority power supply to key systems based on this sorting.

[0108] During this process, the system will intelligently dispatch limited backup power sources and dynamically adjust the power supply sequence and power distribution of each key system according to the actual load demand and the importance of the equipment. For example, it will first ensure that the communication center, cooling system, and key communication and monitoring equipment can obtain sufficient power to maintain their normal operation.

[0109] During the execution of the black start mode, the system will continuously monitor various key indicators in the thermal power plant, including the balance of power loads, the power output of the backup power supply, and the operating status of each key system. When the system detects that the external power supply has been restored, or confirms that the fault has been properly handled and the power system can operate stably, the black start mode will gradually exit to ensure that all systems can gradually return to normal power supply status. After that, the backup power supply will be gradually shut down and enter standby mode, waiting for the next possible emergency call.

[0110] The third working mode uses a multi-level, multi-step fault detection and response mechanism. The black start mode can not only ensure that the thermal power plant can still maintain the operation of key equipment when encountering a serious power failure, but also quickly return to normal after power supply is restored, providing strong protection for the safety and stability of the entire plant.

[0111] Beneficial effects of this embodiment:

[0112] The main innovative content of the thermal power plant battery system supporting multiple working modes proposed in this embodiment is that it has made a functional breakthrough in the application of the second battery. Compared with the traditional thermal power plant backup power supply which usually only has the basic power supply function, this embodiment designs the second battery as a multifunctional backup power supply, which can not only quickly take over the frequency regulation task when the first battery fails to ensure the stable operation of the power grid, but also serve as the power source for key equipment in the black start mode to provide priority power supply for important systems in the thermal power plant. By introducing real-time status monitoring, intelligent diagnosis and optimized scheduling, this design not only significantly improves the comprehensive performance of the backup battery, but also expands its function from a single emergency power supply to the core link of dynamically participating in frequency regulation and power restoration, making up for the deficiency of the single function of the traditional thermal power plant battery and enhancing the reliability and adaptability of the system.

[0113] Embodiment 2

[0114] This embodiment also provides a control method for a thermal power plant battery system supporting multiple working modes, comprising the following steps:

[0115] After receiving the frequency modulation demand signal through the communication center, detecting the working state of the first storage battery;

[0116] Determining, by a data processing module, whether the working state of the first storage battery supports frequency modulation;

[0117] If frequency modulation is supported, the first working mode is used to modulate the frequency of the external power grid;

[0118] If a battery failure occurs in a thermal power plant, the second working mode is used to adjust the frequency of the external power grid;

[0119] If a power outage occurs in the thermal power plant, the third working mode will be used to supply power.

[0120] The control method of a thermal power plant battery system supporting multiple working modes provided in this embodiment has all the advantages of the thermal power plant battery system supporting multiple working modes provided in the first embodiment.

[0121] Embodiment 3

[0122] This embodiment further discloses a computer device, including a memory, a processor, and a computer program stored in the memory, wherein the processor executes the computer program to implement the steps of the method described in the second embodiment.

[0123] Embodiment 4

[0124] This embodiment further discloses a computer-readable storage medium on which a computer program is stored. When the computer program is executed by a processor, the steps of the method described in the second embodiment are implemented.

[0125] Embodiment 5

[0126] This embodiment also discloses a computer program product, including a computer program, which implements the steps of the method described in the second embodiment when executed by a processor.

[0127] The above are only preferred specific implementations of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A thermal power plant battery system supporting multiple working modes, characterized in that: include: The power transmission subsystem includes: a first storage battery, a second storage battery, a bidirectional inverter, an AC bus, and a power grid outside the thermal power plant; wherein the first storage battery and the second storage battery are connected to the power grid outside the thermal power plant through the bidirectional inverter and the AC bus, respectively; Signal transmission subsystem, including: communication center, data storage module, data processing module, battery status monitoring module, power transmission module; Among them, the first battery is monitored by the battery status monitoring module to obtain monitoring information, and the monitoring information is transmitted to the data storage module. The monitoring information in the data storage module is processed by the data processing module to obtain the working status of the first battery; if the working status is normal, the first working mode is executed on the external power grid through the communication center; if the working status is abnormal, the first battery is isolated through the communication center, and the second working mode is executed through the second battery; if the second battery is used as the power source of the third working mode, the power supply situation in the factory is monitored in real time through the power transmission module.

2. The system according to claim 1, characterized in that The first working mode is a frequency regulation mode of the external power grid; The first working mode is a frequency regulation mode when the second storage battery is used as a safety power supply; The third working mode is a mode in which the second storage battery supplies power to key equipment in the thermal power plant.

3. The system according to claim 1, characterized in that The battery status monitoring module includes an acoustic emission sensor, a fiber Bragg grating sensor, an electrochemical impedance spectroscopy analysis sensor, a multi-band infrared imaging sensor and a gas sensor array.

4. The system according to claim 1, characterized in that The power transmission module includes a temperature sensor, a resistance sensor and a vibration sensor.

5. A control method for a thermal power plant battery system supporting multiple working modes as claimed in any one of claims 1 to 4, characterized in that: The following steps are involved: After receiving the frequency modulation demand signal through the communication center, detecting the working state of the first storage battery; Determining, by a data processing module, whether the working state of the first storage battery supports frequency modulation; If frequency modulation is supported, the first working mode is used to modulate the frequency of the external power grid; If a battery failure occurs in a thermal power plant, the second working mode is used to adjust the frequency of the external power grid; If a power outage occurs in the thermal power plant, the third working mode will be used to supply power.

6. The control method according to claim 5, characterized in that: The first working mode is used to adjust the frequency of the external power grid, including: S1: Set the frequency modulation dead zone of the first battery to , detect whether the grid frequency deviation |Δf| exceeds the frequency regulation dead zone; when |Δf|< When |Δf|> When the first battery is enabled to perform frequency modulation, step S2 is executed; S2: Detect whether the grid frequency deviation Δf is greater than zero; if Δf>0, proceed to step S3; if Δf<0, proceed to step S6; S3: Settings is the threshold for switching between primary frequency modulation and secondary frequency modulation; when Δf>0, check whether Δf exceeds f3; if Δf>f3, execute step S4; if Δf<f3, execute step S5; S4: When Δf> When the frequency deviation Δf and the frequency change rate d(Δf) / dt are used, the MPC prediction model is used to predict the future frequency change trend and calculate the optimal power output adjustment path to restore the frequency to the critical value. within the scope of S5: When Δf< When the frequency is high, a hierarchical control strategy is used to adjust the power in a short time through the fast response layer to suppress the frequency fluctuation, and the power is dispatched in a long time through the optimization layer to gradually adjust the output of the first battery to ensure that the frequency is restored to the regulation range; S6: When Δf<0, check whether Δf is lower than - ; If Δf<- , execute step S7; if Δf>- , execute step S8; S7: When Δf<- When the frequency is restored to the critical value, the optimal power distribution control is adopted to calculate the optimal output ratio of each frequency modulation unit according to the current frequency deviation Δf and the remaining power of the first battery. within the scope of S8: Based on whether the remaining power of the first storage battery is lower than , using a hierarchical control strategy to perform step-by-step power adjustments to ensure that the frequency is restored to the regulation range; S9: When d(Δf) / dt is greater than zero, the frequency deviation change rate is adjusted and superimposed on the energy storage active control loop through the MPC prediction model to ensure stable frequency recovery; when d(Δf) / dt is less than zero, the system frequency is restored through the fast response layer of the hierarchical control strategy; S10: If the SOC value is less than When the SOC value is greater than When the frequency deviation Δf is adjusted to within the dead zone, the frequency modulation stability of the system is maintained by using the optimization layer of the hierarchical control strategy.

7. A computer device comprising a memory, a processor and a computer program stored in the memory, characterized in that: The processor executes the computer program to implement the steps of the method of claim 5.

8. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method according to claim 5 are implemented.

9. A computer program product, comprising a computer program, characterized in that When the computer program is executed by a processor, the steps of the method according to claim 5 are implemented.

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