Thermal power generating unit and electric energy storage coordinated frequency modulation automatic control system and control method

Abstract

The invention relates to the technical field of automatic control, in particular to a thermal power generating unit and electric energy storage collaborative frequency modulation automatic control system and a control method. The control system comprises a data acquisition module, an energy storage load data processing assembly, a power grid frequency data processing assembly, an energy storage primary frequency modulation input judgment assembly and a frequency modulation instruction generation and cooperative control assembly. The data acquisition module acquires various key data through a plurality of transmitters. And the energy storage load data processing assembly adjusts an energy storage signal to guarantee safe operation. And the power grid frequency data processing component calculates frequency deviation and converts signals. And the energy storage primary frequency modulation input judgment component makes judgment according to the related signals. And the frequency modulation instruction generation and cooperative control assembly generates an instruction through an adder to control the thermal power generating unit and the energy storage system. All the components work cooperatively, stability and reliability of power grid frequency modulation are effectively improved, and safe operation of a power grid is guaranteed.

Description

Technical Field

[0001] The present invention relates to the field of automatic control technology, and in particular to an automatic control system and control method for coordinated frequency regulation of a thermal power unit and electric energy storage. Background Art

[0002] The core goal of grid frequency regulation is to suppress small load disturbances across the entire grid through rapid response mechanisms and maintain system frequency stability. In the process of building new power systems, the large-scale integration of intermittent renewable energy sources such as wind power and photovoltaics, coupled with the deepening development of ultra-high voltage AC / DC hybrid transmission, has led to significant uncertainty in power generation fluctuations, power interactions on the transmission side, and load characteristics on the power consumption side. This has posed a severe challenge to the real-time balance control of active power in interconnected power grids.

[0003] The current power grid's primary frequency regulation system is still primarily supported by thermal and hydropower units. Although wind power, photovoltaics, and energy storage systems are gradually gaining frequency regulation capabilities, they are limited by technological development and operational mechanisms, making it difficult to fully realize their frequency regulation efficiency. As the proportion of renewable energy installed capacity in the power grid continues to rise, the proportion of traditional thermal power units participating in frequency regulation has declined significantly. Among them, wind power and photovoltaics, whose output is constrained by natural conditions such as sunlight and wind speed, exhibit significant intermittent, fluctuating, and unpredictable characteristics. In the absence of effective control measures, they are forced to implement power curtailment operations, resulting in reduced clean energy utilization efficiency. Thermal power units, however, are limited by the physical characteristics of the equipment and suffer from slow ramp rates (minute-level response), insufficient load regulation accuracy, and increased equipment wear caused by frequent changes in operating conditions. These problems make it difficult for them to meet the power grid's requirements for frequency regulation response speed and regulation accuracy.

[0004] Under complex operating conditions such as the widening of system peak-to-valley differences and power oscillations caused by multiple DC feeds, the existing frequency regulation resources have significant shortcomings in response timeliness, regulation accuracy, and operational stability. It is urgent to improve the grid frequency regulation performance through technological innovation. Summary of the Invention

[0005] In order to solve the above technical problems, the present invention provides a thermal power unit and electric energy storage coordinated frequency regulation automatic control system and control method, which improves and optimizes the control strategy. The coordinated participation of thermal power units and energy storage systems in control is an important strategy for improving the stability and regulation efficiency of power grid frequency. The thermal power unit and electric energy storage coordinated frequency regulation automatic control system includes: a data acquisition module, an energy storage load data processing component, a power grid frequency data processing component, an energy storage primary frequency regulation input judgment component, and a frequency regulation instruction generation and coordinated control component; wherein,

[0006] The data acquisition module includes a first parameter transmitter, a second parameter transmitter, a third parameter transmitter and a fourth parameter transmitter. The first parameter transmitter obtains energy storage load data, the second parameter transmitter obtains grid frequency data, the third parameter transmitter obtains energy storage primary frequency regulation input data, and the fourth parameter transmitter obtains thermal power unit primary frequency regulation instructions.

[0007] The energy storage load data processing component includes a first rate generator, a second rate generator, a safe operation constraint module and a first signal selection module. The output end of the first parameter transmitter is connected to the input ends of the first rate generator, the second rate generator, the safe operation constraint module and the first signal selection module. The output end of the safe operation constraint module controls the connection to the on-off port of the first signal selection module. The output ends of the first rate generator and the second rate generator are connected to the input end of the first signal selection module.

[0008] The power grid frequency data processing component includes a power grid target frequency setting module, a subtractor, a frequency deviation constraint module, a signal amplitude conversion module and a second signal selection module, the second parameter transmitter and the power grid target frequency setting module are connected to the input end of the subtractor, the output end of the subtractor is connected to the input end of the frequency deviation constraint module, and the output end of the frequency deviation constraint module is controlled to connect to the on-off port of the second signal selection module; the input end of the signal amplitude conversion module is connected to the output end of the first signal selection module, and the output end of the signal amplitude conversion module and the output end of the first signal selection module are connected to the input end of the second signal selection module;

[0009] The energy storage primary frequency modulation input judgment component includes a zero-value signal reference module and a third signal selection module, the third parameter transmitter controls the on-off port connected to the third signal selection module, and the output ends of the zero-value signal reference module and the second signal selection module are connected to the input end of the third signal selection module;

[0010] The frequency modulation instruction generation and coordinated control component includes an adder, the input end of the adder is connected to the output end of the fourth parameter transmitter and the third signal selection module, and the output end of the adder is connected to the thermal power unit controller and the energy storage system controller.

[0011] In one embodiment of the present invention, the safe operation constraint module includes an upper limit constraint module, a lower limit constraint module and a logic processing module, the input ends of the upper limit constraint module and the lower limit constraint module are connected to the output end of the first parameter transmitter, the output ends of the upper limit constraint module and the lower limit constraint module are connected to the input end of the logic processing module, and the output end of the logic processing module is connected to the on-off port of the first signal selection module.

[0012] In one embodiment of the present invention, the logic processing module is an AND module.

[0013] In one embodiment of the present invention, the upper limit value of the upper limit constraint module is 8MW, and the lower limit value of the lower limit constraint module is 3MW.

[0014] In one embodiment of the present invention, the signal amplitude conversion module includes a signal inversion module and a multiplier, the output end of the signal inversion module and the first signal selection module are connected to the input end of the multiplier, and the output end of the multiplier is connected to the input end of the second signal selection module.

[0015] In one embodiment of the present invention, the setting value of the signal inversion module is -1.

[0016] In one embodiment of the present invention, the target value of the power grid target frequency setting module is 50 Hz.

[0017] In one embodiment of the present invention, the lower limit value of the frequency deviation constraint module is -0.03 Hz.

[0018] In one embodiment of the present invention, when the input value of the first rate generator changes, the output value gradually changes to the input value within a range of 20% per second; when the input value of the second rate generator changes, the output value gradually changes to the input value within a range of 10% per second.

[0019] Based on the same inventive concept, the present invention also provides a method for automatically controlling the coordinated frequency regulation of a thermal power generation unit and an electric energy storage device, which is implemented by the aforementioned automatic control system for coordinated frequency regulation of a thermal power generation unit and an electric energy storage device. The method comprises the following steps:

[0020] S1: Acquire energy storage load data, adjust the signal rate of the energy storage load data, and output the energy storage load data after the signal rate adjustment within the safe operation range of the system;

[0021] S2: Obtaining the actual operating frequency and the target operating frequency of the power grid, and performing calculations based on the actual operating frequency and the target operating frequency to obtain a frequency deviation signal;

[0022] S3: Setting a lower limit constraint value of the frequency deviation signal, and determining whether the frequency deviation signal is less than the lower limit constraint value:

[0023] If so, replacing the frequency deviation signal with the lower limit constraint value, and setting a first signal selection condition according to the replaced frequency deviation signal;

[0024] If not, output the frequency deviation signal and set the first signal selection condition according to the frequency deviation signal;

[0025] S4: performing signal inversion processing on the energy storage load data after the signal rate adjustment to obtain inverted energy storage load data, and selecting one of the energy storage load data after the signal rate adjustment and the inverted energy storage load data as output according to the first signal selection condition;

[0026] S5: Obtaining the energy storage system's primary frequency modulation input data, setting a second signal selection condition based on the energy storage system's primary frequency modulation input data, and determining whether the energy storage system has been put into primary frequency modulation based on the second signal selection condition:

[0027] If not, output a zero value signal;

[0028] If so, output the signal selection result obtained by S4;

[0029] S6: Obtain a primary frequency modulation command signal of the thermal power unit, add the primary frequency modulation command signal of the thermal power unit and the signal selection result obtained in S5 to generate a final frequency modulation command;

[0030] S7: Based on the final frequency regulation instruction, coordinated closed-loop control of the thermal power unit and the energy storage system is achieved.

[0031] The above technical solution of the present invention has the following advantages over the prior art:

[0032] This invention achieves coordinated frequency regulation between thermal power units and energy storage systems, optimizing control strategies. It effectively compensates for the slow response and limited ramp rate of thermal power units, improving grid frequency stability and regulation efficiency. This approach does not affect the units' response logic to automatic generation control (AGC), ensuring efficient frequency regulation and maintaining stable grid operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to make the content of the present invention more clearly understood, the present invention is further described in detail below based on specific embodiments of the present invention in conjunction with the accompanying drawings, wherein:

[0034] Figure 1 This is a schematic structural diagram of a thermal power unit and electric energy storage coordinated frequency regulation automatic control system provided in an embodiment of the present invention;

[0035] Figure 2 This is a schematic diagram of the specific structure of a thermal power unit and electric energy storage coordinated frequency regulation automatic control system provided in an embodiment of the present invention;

[0036] Figure 3 This is a flow chart of an automatic frequency regulation control method for a thermal power unit and electric energy storage system provided in an embodiment of the present invention;

[0037] Description of the accompanying drawings in the specification: 10, data acquisition module; 101, first parameter transmitter; 102, second parameter transmitter; 103, third parameter transmitter; 104, fourth parameter transmitter;

[0038] 20. Energy storage load data processing component; 201. First rate generator; 202. Second rate generator; 203. Safe operation constraint module; 2031. Upper limit constraint module; 2032. Lower limit constraint module; 2033. Logic processing module; 204. First signal selection module;

[0039] 30. Grid frequency data processing component; 301. Grid target frequency setting module; 302. Subtractor; 303. Frequency deviation constraint module; 304. Signal amplitude conversion module; 3041. Signal inversion module; 3042. Multiplier; 305. Second signal selection module;

[0040] 40. Energy storage primary frequency modulation input judgment component; 401. Zero value signal reference module; 402. Third signal selection module;

[0041] 50. Frequency modulation instruction generation and coordinated control component; 501. Adder. DETAILED DESCRIPTION

[0042] The present invention will be further described below with reference to the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it. However, the embodiments are not intended to limit the present invention.

[0043] Example 1:

[0044] Integrating large-capacity energy storage systems into thermal power units to achieve coordinated frequency regulation has become a key solution to breaking through the current technical bottlenecks in power system frequency regulation. With their millisecond-level response speeds and high-precision power regulation, energy storage systems can efficiently handle the dynamic load regulation required for thermal power unit frequency regulation, effectively compensating for the inherent shortcomings of thermal power units, such as slow frequency response speed and low regulation accuracy.

[0045] Based on statistical analysis of the frequency regulation characteristics of the power grid's automatic generation control (AGC), conventional frequency regulation command amplitudes typically account for 3% to 4% of the rated capacity of thermal power units. Based on this, allocating energy storage capacity in proportion to the power generation capacity can create a highly efficient and coordinated frequency regulation model. This model can significantly reduce the frequency of frequent load changes in thermal power units and mitigate fatigue wear on critical equipment caused by severe fluctuations in thermal and mechanical stress. By optimizing the operating conditions of thermal power units, the economic efficiency and reliability of unit operation can be effectively improved, providing a strong guarantee for the safe and stable operation of the power system.

[0046] Based on this, see Figure 1 and Figure 2 The present invention provides a thermal power unit and electric energy storage coordinated frequency regulation automatic control system comprising: a data acquisition module 10, an energy storage load data processing component 20, a grid frequency data processing component 30, an energy storage primary frequency regulation input judgment component 40, and a frequency regulation instruction generation and coordinated control component 50; wherein,

[0047] The data acquisition module 10 includes a first parameter transmitter 101, a second parameter transmitter 102, a third parameter transmitter 103 and a fourth parameter transmitter 104. The first parameter transmitter 101 obtains energy storage load data, the second parameter transmitter 102 obtains grid frequency data, the third parameter transmitter 103 obtains energy storage primary frequency regulation input data, and the fourth parameter transmitter 104 obtains thermal power unit primary frequency regulation instructions.

[0048] The energy storage load data processing component 20 includes a first rate generator 201, a second rate generator 202, a safe operation constraint module 203 and a first signal selection module 204. The output end of the first parameter transmitter 101 is connected to the input ends of the first rate generator 201, the second rate generator 202, the safe operation constraint module 203 and the first signal selection module 204. The output end of the safe operation constraint module 203 controls the connection to the on-off port of the first signal selection module 204. The output ends of the first rate generator 201 and the second rate generator 202 are connected to the input end of the first signal selection module 204.

[0049] The grid frequency data processing component 30 includes a grid target frequency setting module 301, a subtractor 302, a frequency deviation constraint module 303, a signal amplitude conversion module 304 and a second signal selection module 305. The second parameter transmitter 102 and the grid target frequency setting module 301 are connected to the input end of the subtractor 302, the output end of the subtractor 302 is connected to the input end of the frequency deviation constraint module 303, and the output end of the frequency deviation constraint module 303 controls the on-off port connected to the second signal selection module 305; the input end of the signal amplitude conversion module 305 is connected to the output end of the first signal selection module 204, and the output end of the signal amplitude conversion module 305 and the output end of the first signal selection module 204 are connected to the input end of the second signal selection module 305;

[0050] The energy storage primary frequency modulation input judgment component 40 includes a zero-value signal reference module 401 and a third signal selection module 402. The third parameter transmitter 103 controls the on-off port connected to the third signal selection module 402. The output end of the zero-value signal reference module 401 and the second signal selection module 305 is connected to the input end of the third signal selection module 402.

[0051] The frequency modulation instruction generation and coordinated control component 50 includes an adder 501, the input end of the adder 501 is connected to the output end of the fourth parameter transmitter 104 and the third signal selection module 402, and the output end of the adder 501 is connected to the thermal power unit controller and the energy storage system controller.

[0052] As can be seen from the above technical solution, the present invention accurately obtains key data such as energy storage load and grid frequency through the data acquisition module 10, intelligently processes and analyzes it through the energy storage load data processing component 20 and the grid frequency data processing component 30, and flexibly decides it in combination with the energy storage primary frequency regulation input judgment component 40. Finally, the frequency regulation instruction generation and collaborative control component 50 integrates and outputs instructions, thereby achieving efficient collaboration between thermal power units and electric energy storage. It has the advantages of accurate data acquisition, intelligent processing, flexible decision-making, and efficient collaboration, which can effectively improve the stability and reliability of grid frequency regulation and ensure the safe operation of the grid.

[0053] Furthermore, the safe operation constraint module 203 includes an upper limit constraint module 2031, a lower limit constraint module 2032 and a logic processing module 2033. The input ends of the upper limit constraint module 2031 and the lower limit constraint module 2032 are connected to the output end of the first parameter transmitter 101, the output ends of the upper limit constraint module 2031 and the lower limit constraint module 2032 are connected to the input end of the logic processing module 2033, and the output end of the logic processing module 2033 is connected to the on-off port of the first signal selection module 204.

[0054] In this embodiment, the upper limit value of the upper limit constraint module 2031 is set to 8MW, and the lower limit value of the lower limit constraint module 2032 is set to 3MW. The logic processing module 2033 is preferably an AND module.

[0055] Specifically, when the received energy storage load data of the first rate generator 201 changes, its output value will gradually change to the input value at a rate of 20% per second, thereby achieving a fast and smooth transition of the signal. This feature is suitable for application scenarios where the energy storage system needs to respond quickly. When the energy storage load data of the second rate generator 202 changes, the output value gradually approaches the input value at a rate of 10% per second, which can provide a relatively slow signal change rate to adapt to working conditions that do not require high adjustment speed. The purpose of this setting is to prevent sudden changes in the power of the energy storage system, ensure that the output changes of the energy storage system are more stable, and reduce the impact on the power grid.

[0056] In this embodiment, the first parameter transmitter 101 obtains energy storage load data, including the charge and discharge power of the energy storage device, and can reflect the current real-time state of electric energy storage or release of the energy storage system in real time.

[0057] The upper limit constraint module 2031 imposes an upper limit on the energy storage load data obtained by the first parameter transmitter 101. Once the data exceeds 8MW, it outputs 8MW, thereby effectively preventing overcharging of the energy storage system. The lower limit constraint module 2032 imposes a lower limit on the energy storage load data obtained by the first parameter transmitter 101. When the data is less than 3MW, it outputs 3MW, thereby preventing over-discharging of the energy storage system.

[0058] The logic processing module 2033 receives the output signals from the upper limit constraint module 2031 and the lower limit constraint module 2032 and performs a logical AND operation. Only when both signals meet the requirements, that is, when the energy storage load data is within the range of 3MW to 8MW, will the logic processing module 2033 output a valid signal, thereby controlling the activation of the first signal selection module 204. Once activated, the first signal selection module 204 selects and outputs the output signals from the first rate generator 201 and the second rate generator 202 based on the response requirements of the energy storage device.

[0059] In this embodiment, in the grid frequency data processing component 30, the target value of the grid target frequency setting module 301 is 50 Hz, which is an important benchmark for measuring grid frequency stability. The lower limit value of the frequency deviation constraint module 303 is -0.03 Hz, which is used to constrain grid frequency deviation to ensure that grid frequency fluctuations remain within a safe and controllable range.

[0060] Specifically, the subtractor 302 subtracts the grid frequency data obtained by the second parameter transmitter 102 from the target value of the grid target frequency setting module 301 to calculate a grid frequency deviation signal. The frequency deviation signal can intuitively and accurately reflect the degree of deviation of the grid frequency from the target value, providing a key basis for subsequent frequency regulation operations.

[0061] The frequency deviation constraint module 303 imposes a lower limit on the frequency deviation signal output by the subtractor 302. During grid operation, excessively large negative deviations may cause the system to overregulate. This overregulation may not only negatively impact grid stability but also trigger a series of potential safety hazards. The lower limit imposed by the frequency deviation constraint module 303 effectively prevents negative deviations from exceeding the safety threshold of -0.03 Hz, thereby ensuring reliable operation of the grid system in a stable frequency environment and avoiding the adverse consequences of overregulation.

[0062] Furthermore, the signal amplitude conversion module 304 includes a signal inversion module 3041 and a multiplier 3042. The output of the signal inversion module 3041 and the first signal selection module 204 are connected to the input of the multiplier 3042, and the output of the multiplier 3042 is connected to the input of the second signal selection module 305. The setting value of the signal inversion module 3041 is -1.

[0063] The output signal of the first signal selection module 204 is multiplied by the set value -1 of the signal inversion module 3041 to achieve signal direction inversion or amplitude adjustment, flexibly adapting to various frequency modulation control strategies. In the frequency modulation system, the direction of the signal represents the trend of the regulation.

[0064] The second signal selection module 305 is used as a key component of the system output link, which can output a positive signal or a negative signal according to the actual operating state of the power grid. When a positive signal is output, in the logic setting of the frequency regulation system, this means that the system will increase the power output. This operation is usually to cope with the situation where the grid frequency drops, and by increasing the power output, the grid frequency is restored to a stable target value range. On the contrary, when the frequency state of the grid changes, such as a trend of increasing frequency, the adjustment direction needs to be changed, and the second signal selection module 305 will output a negative signal. The output of the negative signal enables the system to respond to fluctuations in the grid frequency in a timely manner and take measures to reduce power output, thereby effectively suppressing the excessive increase in the grid frequency, maintaining the stable operation of the grid frequency, and ensuring the reliability and safety of the entire power system.

[0065] In the energy storage primary frequency modulation activation judgment component 40, the activation of the third signal selection module 402 is controlled according to the energy storage primary frequency modulation activation data obtained by the third parameter transmitter. The third signal selection module 402 determines whether to output the zero-value signal set by the zero-value signal reference module 401 or the output signal of the second signal selection module 305 according to whether the energy storage system is activated for primary frequency modulation.

[0066] When the energy storage system is not participating in primary frequency regulation, the third signal selection module 402 outputs a zero value. This effectively prevents redundant signals from interfering with subsequent control links, such as adder 501, the thermal power unit controller, and the energy storage system actuators, when the energy storage system is not participating in frequency regulation. This prevents system malfunctions caused by invalid signal inputs, thus ensuring the stability and reliability of the entire control system.

[0067] When the energy storage system is engaged in primary frequency regulation, the third signal selection module 402, based on a logical judgment algorithm, immediately switches its output path, using the output signal of the second signal selection module 305 as its output. This signal is then incorporated into the subsequent generation of coordinated frequency regulation instructions between the thermal power generation units and the energy storage system. This allows the energy storage system, leveraging its rapid charging and discharging characteristics, to respond to grid frequency changes in real time, precisely adjusting power output, and efficiently collaborating with the thermal power generation units to achieve stable control of the grid frequency, thereby improving the overall frequency regulation performance and reliability of the power system.

[0068] Furthermore, in the frequency modulation command generation and coordinated control component 50, the adder 501, serving as the core arithmetic unit, employs a fully differential amplifier circuit design to perform a superposition operation on the energy storage regulation signal output by the third signal selection module 402 and the primary frequency modulation command for the thermal power unit collected by the fourth parameter transmitter 104. This process optimizes and integrates the power commands through a weighted distribution algorithm, generating a final frequency modulation command that includes the coordinated regulation parameters for the thermal power unit and the energy storage system, achieving the organic integration of the two frequency modulation resources.

[0069] At the collaborative control implementation level, the distributed control system (DCS) first transmits the generated frequency modulation instructions to the energy storage system controller via the Modbus TCP / IP protocol. Based on the model predictive control (MPC) algorithm, the controller controls the pulse width modulation (PWM) signal of the energy storage converter (PCS) according to the difference between the command target load and the real-time load of the unit to achieve precise regulation of the charging and discharging power of the energy storage system. During the regulation process, the controller collects parameters such as current, voltage, and SOC (state of charge) of the energy storage system in real time, and dynamically optimizes the regulation strategy through an adaptive PID control algorithm to ensure the accuracy and timeliness of the regulation. At the same time, the real-time output data of the energy storage system is transmitted back to the unit control system via the OPC UA protocol, forming a closed-loop control loop, which supports the unit's real-time monitoring and evaluation of the energy storage regulation effect.

[0070] The Automatic Generation Control (AGC) system collects real-time active power data from thermal power units and energy storage systems through a high-speed data acquisition and processing module. After denoising the data using the Kalman filter algorithm, the combined power information is uploaded to the power grid dispatching center through the SCADA system, providing accurate data support for the grid's real-time power balance calculations and dispatching decisions.

[0071] After receiving frequency modulation commands from the DCS, the energy storage battery management system (BMS) uses state estimation algorithms (such as the extended Kalman filter (EKF)) to adjust the energy storage system's charge and discharge loads in real time. By controlling the battery pack's series-parallel switching and balancing circuits, the system rapidly reduces the deviation between actual output and target values while ensuring safe battery operation. The system continuously monitors key parameters such as battery temperature, voltage, and internal resistance, optimizing the charge and discharge strategy through fuzzy control algorithms until the combined output of the thermal power unit and energy storage system reaches the frequency modulation target, completing the frequency modulation task.

[0072] After the frequency regulation task is completed, the energy storage control unit initiates a battery recovery program, employing a constant current-constant voltage (CC-CV) charging strategy and active balancing technology to restore the energy storage device's batteries to their rated operating state. The entire control process interacts with the AGC system via an isolated communication interface. Priority queuing and conflict detection mechanisms ensure no interference with the unit's existing AGC response logic, maintaining grid stability and reliability.

[0073] Example 2:

[0074] Based on the same inventive concept as that of the first embodiment, the present invention also provides a method for automatically controlling the frequency regulation of a thermal power plant and an electric energy storage system, which is realized by the automatic frequency regulation control system of the thermal power plant and the electric energy storage system described in the first embodiment. Figure 3 As shown, the automatic control method for coordinated frequency regulation of thermal power generation units and electric energy storage includes the following steps:

[0075] S1: Acquire energy storage load data through the first parameter transmitter 101, adjust the signal rate of the energy storage load data through the first rate generator 201 and the second rate generator 202, and output the energy storage load data after the signal rate adjustment within the system safe operation range established by the safe operation constraint module 203;

[0076] S2: The actual operating frequency of the power grid is obtained through the second parameter transmitter 102, and the target operating frequency of the power grid is set to 50 Hz using the power grid target frequency setting module 301. The subtractor 302 calculates according to the actual operating frequency of the power grid and the target operating frequency of the power grid to obtain a frequency deviation signal;

[0077] S3: The frequency deviation constraint module 303 sets a lower limit constraint value (-0.03 Hz) of the frequency deviation signal, and determines whether the frequency deviation signal is less than the lower limit constraint value:

[0078] If so, replacing the frequency deviation signal with the lower limit constraint value, and setting a first signal selection condition according to the replaced frequency deviation signal;

[0079] If not, output the frequency deviation signal and set the first signal selection condition according to the frequency deviation signal;

[0080] S4: The signal amplitude conversion module 304 performs signal inversion processing on the energy storage load data after the signal rate adjustment to obtain inverted energy storage load data. The second signal selection module 305 selects one of the energy storage load data after the signal rate adjustment and the inverted energy storage load data as output according to the first signal selection condition.

[0081] S5: The primary frequency modulation input data of the energy storage system is obtained through the third parameter transmitter 103, and a second signal selection condition is set according to the primary frequency modulation input data of the energy storage system. The third signal selection module 402 determines whether the energy storage system is in the primary frequency modulation input according to the second signal selection condition:

[0082] If not, output the zero-value signal set by the zero-value signal reference module 401;

[0083] If so, output the signal selection result obtained by S4;

[0084] S6: Obtain the primary frequency modulation command signal of the thermal power unit through the fourth parameter transmitter 104, and the adder 501 adds the primary frequency modulation command signal of the thermal power unit and the signal selection result obtained in S5 to generate a final frequency modulation command;

[0085] S7: Based on the final frequency regulation instruction, coordinated closed-loop control of the thermal power unit and the energy storage system is achieved.

[0086] Those skilled in the art will appreciate that the embodiments of the present application can be provided as methods, systems, or computer program products. Therefore, the present application can adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application can adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage, CD-ROM, optical storage, etc.) that contain computer-usable program code.

[0087] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the steps in the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0088] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0089] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0090] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will appreciate that other variations or modifications can be made based on the above description. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.

Claims

1. A thermal power unit and electric energy storage coordinated frequency regulation automatic control system, characterized in that: include: A data acquisition module, comprising a first parameter transmitter, a second parameter transmitter, a third parameter transmitter, and a fourth parameter transmitter. The first parameter transmitter acquires energy storage load data, the second parameter transmitter acquires grid frequency data, the third parameter transmitter acquires energy storage primary frequency regulation input data, and the fourth parameter transmitter acquires thermal power unit primary frequency regulation instructions. An energy storage load data processing component, the energy storage load data processing component includes a first rate generator, a second rate generator, a safe operation constraint module and a first signal selection module, the output end of the first parameter transmitter is connected to the input end of the first rate generator, the second rate generator, the safe operation constraint module and the first signal selection module, the output end of the safe operation constraint module controls the connection to the on-off port of the first signal selection module, and the output ends of the first rate generator and the second rate generator are connected to the input end of the first signal selection module; A power grid frequency data processing component, the power grid frequency data processing component includes a power grid target frequency setting module, a subtractor, a frequency deviation constraint module, a signal amplitude conversion module and a second signal selection module, the second parameter transmitter and the power grid target frequency setting module are connected to the input end of the subtractor, the output end of the subtractor is connected to the input end of the frequency deviation constraint module, and the output end of the frequency deviation constraint module controls the on / off port connected to the second signal selection module; the input end of the signal amplitude conversion module is connected to the output end of the first signal selection module, and the output end of the signal amplitude conversion module and the output end of the first signal selection module are connected to the input end of the second signal selection module; An energy storage primary frequency modulation input judgment component, the energy storage primary frequency modulation input judgment component includes a zero-value signal reference module and a third signal selection module, the third parameter transmitter controls the on-off port connected to the third signal selection module, and the output ends of the zero-value signal reference module and the second signal selection module are connected to the input end of the third signal selection module; And a frequency modulation instruction generation and collaborative control component, the frequency modulation instruction generation and collaborative control component includes an adder, the input end of the adder is connected to the output end of the fourth parameter transmitter and the third signal selection module, and the output end of the adder is connected to the thermal power unit controller and the energy storage system controller.

2. The automatic frequency regulation control system for thermal power generation units and electric energy storage according to claim 1 is characterized in that: The safe operation constraint module includes an upper limit constraint module, a lower limit constraint module and a logic processing module. The input ends of the upper limit constraint module and the lower limit constraint module are connected to the output end of the first parameter transmitter, the output ends of the upper limit constraint module and the lower limit constraint module are connected to the input end of the logic processing module, and the output end of the logic processing module is connected to the on-off port of the first signal selection module.

3. The automatic frequency regulation control system for thermal power generation units and electric energy storage according to claim 2 is characterized in that: The logic processing module is an AND module.

4. The automatic frequency regulation control system for thermal power generation units and electric energy storage according to claim 2 is characterized in that: The upper limit value of the upper limit constraint module is 8MW, and the lower limit value of the lower limit constraint module is 3MW.

5. The automatic frequency regulation control system for thermal power generation units and electric energy storage according to claim 1 is characterized in that: The signal amplitude conversion module includes a signal inversion module and a multiplier. The output ends of the signal inversion module and the first signal selection module are connected to the input end of the multiplier. The output end of the multiplier is connected to the input end of the second signal selection module.

6. The automatic frequency regulation control system for thermal power generation units and electric energy storage according to claim 5 is characterized in that: The setting value of the signal inversion module is -1.

7. The automatic frequency regulation control system for thermal power generation units and electric energy storage according to claim 1 is characterized in that: The target value of the power grid target frequency setting module is 50 Hz.

8. The automatic frequency regulation control system for thermal power generation units and electric energy storage according to claim 1 is characterized in that: The lower limit value of the frequency deviation constraint module is -0.03 Hz.

9. The automatic frequency regulation control system for thermal power generation units and electric energy storage according to claim 1 is characterized in that: When the input value of the first rate generator changes, the output value gradually changes to the input value within a range of 20% of the range in 1 second; when the input value of the second rate generator changes, the output value gradually changes to the input value within a range of 10% of the range in 1 second.

10. A method for automatic frequency regulation control of a thermal power unit and electric energy storage, characterized in that: The method is implemented by the automatic control system for coordinated frequency regulation of a thermal power generation unit and an electric energy storage system according to any one of claims 1 to 9, wherein the automatic control method for coordinated frequency regulation of a thermal power generation unit and an electric energy storage system comprises the following steps: S1: Acquire energy storage load data, adjust the signal rate of the energy storage load data, and output the energy storage load data after the signal rate adjustment within the safe operation range of the system; S2: Obtaining the actual operating frequency and the target operating frequency of the power grid, and performing calculations based on the actual operating frequency and the target operating frequency to obtain a frequency deviation signal; S3: Setting a lower limit constraint value of the frequency deviation signal, and determining whether the frequency deviation signal is less than the lower limit constraint value: If so, replacing the frequency deviation signal with the lower limit constraint value, and setting a first signal selection condition according to the replaced frequency deviation signal; If not, output the frequency deviation signal and set the first signal selection condition according to the frequency deviation signal; S4: performing signal inversion processing on the energy storage load data after the signal rate adjustment to obtain inverted energy storage load data, and selecting one of the energy storage load data after the signal rate adjustment and the inverted energy storage load data as output according to the first signal selection condition; S5: Obtaining the energy storage system's primary frequency modulation input data, setting a second signal selection condition based on the energy storage system's primary frequency modulation input data, and determining whether the energy storage system has been put into primary frequency modulation based on the second signal selection condition: If not, output a zero value signal; If so, output the signal selection result obtained by S4; S6: Obtain a primary frequency modulation command signal of the thermal power unit, add the primary frequency modulation command signal of the thermal power unit and the signal selection result obtained in S5 to generate a final frequency modulation command; S7: Based on the final frequency regulation instruction, coordinated closed-loop control of the thermal power unit and the energy storage system is achieved.

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