Intelligent thermal storage combined frequency modulation control system and method based on multi-mode switching

Abstract

The present application relates to the technical field of energy storage auxiliary frequency modulation of thermal power generating units, and particularly relates to an intelligent thermal energy storage combined frequency modulation control system and method based on multi-mode switching. The system comprises a remote device, an intelligent thermal energy storage collaborative control system, a thermal power generating unit and an energy storage system. The remote device sends an automatic generation control instruction to the intelligent thermal energy storage collaborative control system and the thermal power generating unit. According to different mode selection methods, the intelligent thermal energy storage collaborative control system obtains an energy storage power instruction by using an internally designed functional module and adjusts the output of the energy storage system. The thermal power generating unit obtains a unit load instruction by using an internally designed functional module and adjusts the output of the thermal power generating unit. The combined output of the energy storage system and the thermal power generating unit responds to the automatic generation control instruction, realizes deep coupling and efficient control of the thermal energy storage system, relieves the pressure of long-term frequent and rapid frequency modulation of the thermal power generating unit, reduces the risk of over-temperature of the boiler water wall, improves the comprehensive economy and safety of the thermal energy storage system, and maximizes the combined frequency modulation capacity of the thermal energy storage system.

Description

Technical Field

[0001] This invention relates to the field of frequency regulation technology for energy storage-assisted thermal power units, and in particular to an intelligent thermal power-storage joint frequency regulation control system and method based on multi-mode switching. Background Technology

[0002] In the context of the new power system era, the proportion of new energy sources is increasing year by year, while the proportion of traditional frequency regulation power sources is gradually declining. Coal-fired power units are facing functional transformation, gradually shifting from conventional main power sources to basic security and system regulation power sources. Due to the intermittent and fluctuating characteristics of new energy output, the frequency fluctuation characteristics and regulation of the system are becoming more complex, and the power grid has higher requirements for the response delay and ramp-up rate of frequency regulation power sources. The power electronic power regulation device of energy storage system can control its nonlinear output, and has the characteristics of fast response, precise control and bidirectional output. It can almost instantly track power commands and is gradually being widely used in the field of power system frequency regulation.

[0003] In China, most energy storage-assisted frequency regulation modes are implemented with the main generator's AGC (Automatic Generation Control) frequency regulation and energy storage frequency regulation operating independently. Energy storage provides a backup based on the difference between the actual power generated by the main generator and the AGC commands, without considering how to efficiently couple the two to achieve optimal performance. The control system design does not consider the effective coordination between the unit's AGC regulation capabilities and the energy storage regulation capabilities. Energy storage simply plays a "backup" role. There should be an optimal mode between the main generator's own frequency regulation function and energy storage frequency regulation. This optimal mode should achieve the highest efficiency, economy, or safety. Thermal power plants can choose the appropriate mode based on their frequency regulation needs, minimizing the regulation pressure on key equipment for rapid frequency regulation while meeting frequency regulation requirements, reducing the risk of boiler water-cooled wall overheating, and maximizing efficiency.

[0004] Therefore, there is an urgent need to develop an intelligent thermal power and energy storage joint frequency regulation control method and system based on multi-mode switching, so as to give full play to the efficient coupling regulation capability of thermal power and energy storage, effectively solve the problem of conventional energy storage-assisted frequency regulation "bottoming out" single coordinated operation, alleviate the pressure of long-term frequent and rapid frequency regulation of thermal power units, reduce the risk of boiler water-cooled wall overheating, efficiently and flexibly give full play to the regulation characteristics of thermal power units and energy storage systems, and maximize the joint frequency regulation capability of thermal power and energy storage systems. Summary of the Invention

[0005] This invention provides an intelligent thermal energy storage joint frequency regulation control system and method based on multi-mode switching, in order to solve the problem that the existing energy storage-assisted frequency regulation modes are basically independent of the main unit AGC frequency regulation and the energy storage frequency regulation, without considering how to deeply couple the two to give full play to the efficient regulation capability of thermal energy storage.

[0006] A first aspect of this invention provides an intelligent thermal power-storage joint frequency regulation control system based on multi-mode switching, comprising: a remote control unit, an intelligent thermal power-storage joint control system, a thermal power unit, and an energy storage system. The remote control unit is connected to both the intelligent thermal power-storage joint control system and the thermal power unit, and is used to send automatic power generation control commands to both the intelligent thermal power-storage joint control system and the thermal power unit. The intelligent thermal power-storage joint control system comprises: a first acquisition module, used to acquire the automatic power generation control command, the operating information of the thermal power unit, and the operating information of the energy storage system; an optimization command generation module, the input of which is connected to the first acquisition module, used to generate an energy storage optimization command based on the automatic power generation control command and the actual power output of the thermal power unit; a first rate limiting module, the input of which is connected to the output of the optimization command generation module, used to determine a target frequency regulation mode and adjust the rate of change of the energy storage power command according to the target frequency regulation mode; and an energy storage power command generation module, the input of which is connected to the output of the first rate limiting module, used to obtain a target energy storage power command limited by the energy storage optimization rate and send it to the energy storage system for execution.

[0007] Optionally, the intelligent thermal energy storage coordinated control system further includes: an adder and a function generator, wherein the input terminal of the adder is connected to the output terminal of the first acquisition module, the output terminal of the adder is connected to the input terminal of the function generator, and the output terminal of the function generator is connected to the input terminal of the optimization instruction generation module. The adder calculates the difference between the received automatic power generation control instruction and the actual power generated by the unit, and inputs the difference to the function generator. The function generator generates an energy storage optimization instruction for discharging the energy storage system when it detects that the difference is greater than 1, generates an energy storage optimization instruction for charging the energy storage system when it detects that the difference is less than -1, and outputs a prohibition on charging and discharging instruction when it detects that the difference is in the range of -1 to 1.

[0008] Optionally, the energy storage power command generation module includes: a first detection module, configured to output a discharge command when the detected energy storage optimization command is greater than 0, and to output a charging command when the detected energy storage optimization command is less than 0; a second detection module, connected to the state of charge (SOC) of the energy storage system, configured to detect whether the SOC of the energy storage system is higher than a first preset value and lower than a preset lower SOC limit, and to output a discharge prohibition command when the detected SOC of the energy storage system is higher than the first preset value and lower than the preset lower SOC limit; configured to detect whether the SOC of the energy storage system is higher than a preset upper SOC value and lower than a second preset value, and to output a charging prohibition command when the detected SOC of the energy storage system is higher than the preset upper SOC value and lower than the second preset value; and an OR gate module, the first detection module... The output terminals of both the first detection module and the second detection module are connected to the input terminal of the OR gate module. The OR gate module is used to generate an energy storage power command or a charge / discharge prohibition command without rate limiting by the first rate limiting module, based on the output commands of the first detection module and the second detection module. A first analog quantity switcher, with its input terminal connected to the output terminal of the OR gate module, is used to receive the output of the OR gate module and determine the energy storage optimization command or the value of the first analog quantity generator based on the output result of the OR gate module as the output value of the first analog quantity switcher. This output value is the energy storage power command without rate limiting by the first rate limiting module, and this value is sent to the first rate limiting module. After passing through the target energy storage optimization rate limiting, the target energy storage power command is obtained.

[0009] Optionally, the first detection module includes: a first detection unit, configured to detect whether the energy storage optimization command is lower than 0, and output the charging command when the energy storage optimization command is detected to be lower than 0; and a second detection unit, configured to detect whether the energy storage optimization command is higher than 0, and output the discharging command when the energy storage optimization command is detected to be higher than 0.

[0010] Optionally, the second detection module includes: a third detection unit, configured to output a discharge prohibition command when the state of charge of the energy storage system is detected to be higher than the first preset value and lower than the preset lower limit of SOC; and a fourth detection unit, configured to output a charging prohibition command when the state of charge of the energy storage system is detected to be higher than the preset upper limit of SOC and lower than the second preset value, wherein the first preset value is 0% and the second preset value is 100%.

[0011] Optionally, the first rate limiting module includes: a second to a fifth analog switch, wherein, when the target frequency modulation mode is the basic frequency modulation mode, the second analog switch is used to acquire the charge / discharge rate of the energy storage system and the basic frequency modulation mode in the energy storage power command, and adjust the charge / discharge rate in the energy storage power command to a first energy storage optimized rate according to the basic frequency modulation mode; when the target frequency modulation mode is a fast response mode, a third analog switch is used to acquire the charge / discharge rate of the energy storage system and the fast response mode, the third analog switch is used to acquire the charge / discharge rate of the energy storage system in the energy storage power command, and adjust the charge / discharge rate in the energy storage power command to a second energy storage optimized rate according to the fast response mode; when the target frequency modulation mode is a safe frequency modulation mode, a fourth analog switch is used to acquire the charge / discharge rate of the energy storage system in the energy storage power command. The fourth analog quantity switcher is used to adjust the charge / discharge rate in the energy storage power command to the third energy storage optimization rate based on the boiler water-cooled wall temperature and the safe frequency regulation mode. When the target frequency regulation mode is the deep regulation auxiliary mode, the fifth analog quantity switcher is used to acquire the charge / discharge rate of the energy storage system, the deep regulation auxiliary mode, the predicted value of the automatic power generation control command, the actual power generation of the thermal power unit, the state of charge of the energy storage system, and the energy storage optimization command in the energy storage power command, and adjust the charge / discharge rate in the energy storage power command to the fourth energy storage optimization rate based on the deep regulation auxiliary mode, the predicted value of the automatic power generation control command, the actual power generation of the thermal power unit, the state of charge of the energy storage system, and the energy storage optimization command.

[0012] Optionally, the first rate limiting module further includes: a third detection module, configured to send an adjustment command to the fourth analog switch when the target frequency regulation mode is a safe frequency regulation mode and the boiler water-cooled wall temperature is higher than a third preset value, causing the fourth analog switch to adjust the charge / discharge rate in the energy storage power command to a third energy storage optimization rate; and a fourth detection module, configured to send an adjustment command to the fifth analog switch when the target frequency regulation mode is a deep regulation auxiliary mode, and the predicted value of the automatic power generation control command is less than a preset unit deep peak load setting, the current actual power generation of the thermal power unit is greater than the preset unit deep peak load setting, the current state of charge of the energy storage system is greater than a preset lower limit of SOC, and the energy storage optimization command is less than 0, causing the fifth analog switch to adjust the charge / discharge rate in the energy storage power command to a fourth energy storage optimization rate.

[0013] Optionally, the thermal power unit includes: a second acquisition module for acquiring automatic generation control commands and a target unit optimized rate; a limiting module for limiting the upper and lower limits of the automatic generation control commands; a second rate limiting module for determining a target frequency regulation mode, and limiting the rate of the automatic generation control commands with upper and lower limits according to the automatic generation control commands and the target frequency regulation mode at the target unit optimized rate to obtain a target unit load command, and outputting it to the unit load command module; and a unit load command module for outputting the target unit load command to the thermal power unit.

[0014] Optionally, the second rate limiting module includes: a sixth to a ninth analog switch, wherein, when the target frequency regulation mode is the basic frequency regulation mode, the sixth analog switch is used to acquire the automatic generation control command rate and the basic frequency regulation mode, and adjust the automatic generation control command rate to the first unit optimized rate according to the basic frequency regulation mode; when the target frequency regulation mode is the fast response mode, the seventh analog switch is used to acquire the automatic generation control command rate and the fast response mode, and adjust the automatic generation control command rate to the second unit optimized rate according to the fast response mode; when the target frequency regulation mode is the safe frequency regulation mode, the eighth analog switch is used to acquire the automatic generation control command rate and the safe frequency regulation mode, and adjust the automatic generation control command rate to the third unit optimized rate according to the safe frequency regulation mode; when the target frequency regulation mode is the deep frequency regulation auxiliary mode, the ninth analog switch is used to acquire the automatic generation control command rate and the deep frequency regulation auxiliary mode, and adjust the automatic generation control command rate to the fourth unit optimized rate according to the deep frequency regulation auxiliary mode.

[0015] A second aspect of the present invention provides a smart thermal power-storage joint frequency regulation control method based on multi-mode switching, employing the aforementioned smart thermal power-storage joint frequency regulation control system with multi-mode switching. The method includes: receiving an automatic power generation control command and determining a target frequency regulation mode; determining a target energy storage power command limited by a target energy storage optimization rate and a target unit load command limited by a target unit optimization rate based on the automatic power generation control command and the target frequency regulation mode; controlling the energy storage system to adjust its energy storage output based on the target energy storage power command, and controlling the thermal power unit to adjust its output based on the target unit load command; the combined output of the energy storage system and the thermal power unit responds to the automatic power generation control command.

[0016] In the above embodiments, an automatic power generation control command is sent to the intelligent thermal power-storage coordinated control system and the thermal power unit using a remote control device. The first acquisition module of the intelligent thermal power-storage coordinated control system acquires the automatic power generation control command, the operating information of the thermal power unit, and the operating information of the energy storage system. An optimization command generation module is used to generate an energy storage optimization command based on the automatic power generation control command and the actual power output of the thermal power unit. A first rate limiting module determines the target frequency regulation mode and adjusts the energy storage power command according to the target energy storage optimization rate based on the target frequency regulation mode. An energy storage power command generation module generates a target energy storage power command, enabling the energy storage system to adjust its energy storage output according to the target energy storage power command. A second acquisition module of the thermal power unit acquires the automatic power generation control command and the target unit optimization rate. A limiting module limits the upper and lower limits of the automatic power generation control command. A second rate limiting module determines the target frequency regulation mode and adjusts the automatic power generation control command rate to the target unit optimization rate according to the target frequency regulation mode. A unit load command module enables the thermal power unit to adjust its output according to the target unit load command. The combined output of the energy storage system and the thermal power unit responds to the automatic power generation control command. This solves the problem that existing energy storage-assisted frequency regulation modes are basically independent of main unit AGC frequency regulation and energy storage frequency regulation, without considering how to deeply couple the two to give full play to the efficient regulation capabilities of thermal power and energy storage. It alleviates the pressure of long-term, frequent and rapid frequency regulation of thermal power units, reduces the risk of boiler water-cooled wall overheating, and efficiently and flexibly gives full play to the regulation characteristics of thermal power units and energy storage systems, maximizing the joint frequency regulation capability of thermal power and energy storage systems.

[0017] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0018] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, wherein:

[0019] Figure 1 A flowchart of an intelligent thermal power and energy storage combined frequency regulation control system based on multi-mode switching according to an embodiment of the present invention;

[0020] Figure 2 A flowchart of a frequency modulation control method for an intelligent fire and energy storage coordinated control system according to an embodiment of the present invention;

[0021] Figure 3 A flowchart of a frequency regulation control method for a thermal power unit according to an embodiment of the present invention;

[0022] Figure 4 This is a schematic diagram of combined fire and energy storage power generation according to an embodiment of the present invention;

[0023] Figure 5 This is a schematic diagram of an scalable intelligent fire-storage combined frequency regulation control system architecture according to an embodiment of the present invention;

[0024] Figure 6 This is an example diagram of a smart thermal energy storage joint frequency regulation control method based on multi-mode switching according to an embodiment of the present invention. Detailed Implementation

[0025] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0026] The following describes an embodiment of the intelligent thermal power and energy storage joint frequency regulation control system and method based on multi-mode switching, with reference to the accompanying drawings. Addressing the issue mentioned in the background art, existing operational energy storage-assisted frequency regulation modes are generally characterized by independent AGC frequency regulation of the main unit and energy storage frequency regulation, failing to consider how to deeply couple them to maximize the efficient regulation capabilities of thermal power and energy storage. This invention provides an intelligent thermal power and energy storage joint frequency regulation control system based on multi-mode switching. In this system, a remote control device sends automatic power generation control commands to the intelligent thermal power and energy storage joint control system and the thermal power unit. The first acquisition module of the intelligent thermal power and energy storage joint control system acquires the automatic power generation control commands, the operating information of the thermal power unit, and the operating information of the energy storage system. An optimization command generation module generates energy storage optimization commands based on the automatic power generation control commands and the actual power output of the thermal power unit. A first rate... The limiting module determines the target frequency regulation mode and adjusts the energy storage power command to the target energy storage optimization rate according to the target frequency regulation mode. The energy storage power command generation module enables the energy storage system to adjust its energy storage output according to the target energy storage power command. The second acquisition module of the thermal power unit acquires the automatic generation control command and the automatic generation control command optimization rate, and the limiting module limits the upper and lower limits of the automatic generation control command. The second rate limiting module determines the target frequency regulation mode and adjusts the automatic generation control command rate to the target unit optimization rate according to the target frequency regulation mode. The unit load command module enables the thermal power unit to adjust its output according to the target unit load command, and the combined output of the energy storage system and the thermal power unit responds to the automatic generation control command. This solves the problem that existing energy storage-assisted frequency regulation modes are basically independent of the main unit AGC frequency regulation and energy storage frequency regulation, without considering how to deeply couple them to maximize the efficient regulation capabilities of thermal power and energy storage. It alleviates the pressure of long-term, frequent, and rapid frequency regulation of thermal power units, reduces the risk of boiler water-cooled wall overheating, and efficiently and flexibly utilizes the regulation characteristics of thermal power units and energy storage systems, maximizing the combined frequency regulation capability of the thermal power and energy storage system.

[0027] Specifically, Figure 1This is a schematic diagram of an intelligent thermal energy storage combined frequency regulation control system based on multi-mode switching, provided in an embodiment of the present invention.

[0028] like Figure 1 As shown, the intelligent thermal-storage joint frequency regulation control system 10 based on multi-mode switching includes: a remote control device 100, an intelligent thermal-storage collaborative control system 200, a thermal power unit 300, and an energy storage system 400. The remote control device 100 is connected to the intelligent thermal-storage collaborative control system 200 and the thermal power unit 300 respectively, and is used to send automatic power generation control commands to the intelligent thermal-storage collaborative control system 200 and the thermal power unit 300, while receiving thermal-storage operation information and unit operation information.

[0029] The intelligent thermal power-storage coordinated control system 200 includes: a first acquisition module 201, used to acquire automatic power generation control commands, operating information of the thermal power unit 300, and operating information of the energy storage system 400; an optimization command generation module 202, whose input is connected to the first acquisition module 201, used to generate energy storage optimization commands based on the automatic power generation control commands and the actual power output of the thermal power unit 300; a first rate limiting module 203, whose input is connected to the output of the optimization command generation module 202, used to determine the target frequency regulation mode and adjust the rate of change of the energy storage power command according to the target frequency regulation mode; and an energy storage power command generation module 204, whose input is connected to the output of the first rate limiting module 203, used to obtain the energy storage power command after optimization rate limiting, and whose output is connected to the energy storage system 400, so that the energy storage system 400 adjusts its energy storage output according to the target energy storage power command.

[0030] Specifically, this invention develops an intelligent thermal power energy storage collaborative control system 200 (ITECCS) that is independent of the thermal power unit 300 (DCS, Distributed Control System) and the energy storage system 400.

[0031] The automatic power generation control command is sent to the intelligent thermal power-storage coordinated control system 200 and the thermal power unit 300 via the remote control device 100. The intelligent thermal power-storage coordinated control system 200 obtains the unit operation information from the thermal power unit 300, including the actual power generation, unit load change rate, boiler water-cooled wall temperature and other analog quantities required for automatic adjustment, as well as the switch signals required for AGC activation / deactivation and ITECCS system activation / deactivation. The system then sends the generated automatic power generation control command optimized rate and energy storage system operation information to the thermal power unit 300, including the optimized load change rate, actual energy storage power generation, energy storage activation / deactivation status and other key analog quantities and switch signals.

[0032] ITECCS obtains energy storage operation information from the energy storage system 400, including key analog and digital signals such as energy storage status, chargeable / dischargeable power, and actual energy storage power, and sends the generated energy storage power command to the energy storage system 400.

[0033] Operators can select any of the four modes to operate according to their needs. When the dispatch AGC command changes, the intelligent thermal power-storage coordinated control system 200 and the thermal power unit 300 respond and perform calculations simultaneously, automatically adjusting the output of the thermal power unit 300 and the energy storage system 400. The remote control device 100 receives the unit operation information sent by the thermal power unit 300 and the thermal power-storage operation information sent by the intelligent thermal power-storage coordinated control system 200, and sends the combined thermal power-storage power to the dispatch center to complete the response to the AGC command.

[0034] Optionally, in some embodiments, the intelligent thermal energy storage coordinated control system 200 further includes an adder and a function generator. The input terminal of the adder is connected to the output terminal of the first acquisition module 201, the output terminal of the adder is connected to the input terminal of the function generator, and the output terminal of the function generator is connected to the input terminal of the optimization instruction generation module 202. The adder calculates the difference between the received automatic power generation control instruction and the actual power generated by the unit, and inputs the difference to the function generator. When the function generator detects a difference greater than 1, it generates an energy storage optimization instruction for discharging the energy storage system 400. When it detects a difference less than -1, it generates an energy storage optimization instruction for charging the energy storage system 400. When it detects a difference between -1 and 1, it outputs a prohibition instruction for charging and discharging. It should be noted that 1 here represents the adjustment dead zone, which is to avoid frequent adjustments of the energy storage system 400 and affect the lifespan of the energy storage system 400. This value can be flexibly adjusted according to the on-site commissioning situation.

[0035] Specifically, the intelligent thermal energy storage coordinated control system 200 takes the received scheduling AGC command and the actual generated power of the unit by adding them together, and then uses a piecewise linear function generator to generate an energy storage optimization command, which is used as the N-terminal input of the first analog switcher.

[0036] Scheduling AGC instructions Compared with the actual power output of the unit The difference obtained by subtraction is ,Right now ,when >1. Unit load increases; when, When reducing the load on a unit with a capacity of <-1, the main function of the piecewise linear function generator is to set a dead zone for regulation, so as to avoid frequent adjustments of the energy storage system and affect its service life.

[0037] After passing through the piecewise function generator, energy storage optimization instructions are generated. ,when >0, the unit increases load, generating an energy storage optimization command for the energy storage system to discharge 400; when <0, the unit reduces load, generating an energy storage optimization command for 400 charging of the energy storage system; when When the value equals 0, the unit load is stable and the actual generated power tracks the AGC command. At this time, the energy storage system 400 neither charges nor discharges.

[0038] Optionally, in some embodiments, the energy storage power command generation module 204 includes: a first detection module, configured to output a discharge command when an energy storage optimization command is detected to be greater than 0, and to output a charging command when an energy storage optimization command is detected to be less than 0; and a second detection module, connected to the state of charge (SOC) of the energy storage system 400, configured to detect whether the SOC of the energy storage system 400 is higher than a first preset value and lower than a preset lower SOC limit, and to output a discharge prohibition command when the SOC of the energy storage system 400 is detected to be higher than the first preset value and lower than the preset lower SOC limit, and to detect whether the SOC of the energy storage system 400 is higher than a preset upper SOC value and lower than a second preset value, and to output a discharge prohibition command when the SOC of the energy storage system 400 is detected to be higher than the preset upper SOC value and lower than the second preset value. The system generates a charging prohibition command; an OR gate module, the outputs of the first detection module and the second detection module are both connected to the input of the OR gate module, the OR gate module is used to generate an energy storage power command or a charging / discharging prohibition command without rate limiting by the first rate limiting module 203, based on the output commands of the first detection module and the second detection module; a first analog quantity switcher, the input of the first analog quantity switcher is connected to the output of the OR gate module, is used to receive the output of the OR gate module, and determine the energy storage optimization command or the value of the first analog quantity generator based on the output result of the OR gate module as the output value of the first analog quantity switcher, and send the output value to the first rate limiting module 203, and after rate limiting optimization, send it to the energy storage power command generation module 204, thereby obtaining the energy storage power command.

[0039] Optionally, in some embodiments, the first detection module includes: a first detection unit, configured to detect whether the energy storage optimization command is lower than 0, and output a charging command when the energy storage optimization command is detected to be lower than 0; and a second detection unit, configured to detect whether the energy storage optimization command is higher than 0, and output a discharging command when the energy storage optimization command is detected to be higher than 0.

[0040] Optionally, in some embodiments, the second detection module includes: a third detection unit, configured to output a discharge prohibition command when the state of charge of the energy storage system 400 is detected to be higher than a first preset value and lower than a preset lower limit of SOC; and a fourth detection unit, configured to output a charging prohibition command when the state of charge of the energy storage system 400 is detected to be higher than a preset upper limit of SOC and lower than a second preset value, wherein the first preset value is 0% and the second preset value is 100%.

[0041] The Y-terminal input of the first analog switch is the first analog generator, and the N-terminal input is the energy storage optimization command. The value of the analog generator is 0. This primarily achieves the following: when the energy storage SOC is in a low-charge state, the energy storage system is prohibited from discharging; when the energy storage SOC is in a high-charge state, the energy storage system is prohibited from charging. Prohibiting discharging or charging is achieved by setting the output of the first analog switch to 0.

[0042] Based on the lower limit (set in the first detection unit) and upper limit (set in the second detection unit) of the energy storage optimization command, and the lower limit (set in the third detection unit) and upper limit (set in the fourth detection unit) of the state of charge of the energy storage system 400, the value of the digital input terminal of the first analog quantity switch is determined, thereby determining which of the two analog inputs, N and Y, will be used as the output.

[0043] like Figure 2 As shown, the selection and judgment loop of the first analog switch includes a first detection unit, a second detection unit, a third detection unit, and a fourth detection unit. The inputs of the first and second detection units are connected to energy storage optimization commands, while the third and fourth detection units are connected to the energy storage system's SOC signal. The output of the third detection unit is connected to the input of the first AND gate, the output of the fourth detection unit is connected to the input of the second AND gate, the outputs of the first and second AND gates are connected to the input of the third AND gate, the outputs of the second detection unit and the first AND gate are connected to the input of the fourth AND gate, the outputs of the third and fourth AND gates are connected to the input of an OR gate module, and the output of the OR gate module is connected to the selection input of the first analog switch.

[0044] The first detection module mainly determines whether the energy storage optimization command is higher or lower than 0. If the first detection unit detects that the energy storage optimization command is higher than 0, the energy storage system needs to be discharged; if the second detection unit detects that the energy storage optimization command is lower than 0, the energy storage system needs to be charged.

[0045] The third detection unit is mainly responsible for determining whether the SOC of the energy storage system is at a low level. Specifically, it determines whether 0% (i.e., the first preset value) < the SOC of the energy storage system < the low SOC protection lower limit provided by the energy storage manufacturer (i.e., the preset lower limit of SOC). When the SOC of the energy storage system is within this range, the energy storage system is prohibited from discharging.

[0046] Therefore, when 0% (i.e., the first preset value) < energy storage system SOC < energy storage manufacturer's low power protection lower limit value (i.e., the preset SOC lower limit value), and the energy storage optimization command is greater than 0, the first analog quantity switch output is 0, that is, the energy storage discharge prohibition command is output.

[0047] The fourth detection unit is mainly responsible for determining whether the SOC of the energy storage system is at a high level. Specifically, if the SOC protection upper limit provided by the energy storage manufacturer (the preset SOC upper limit) is less than the SOC of the energy storage system and less than 100% (i.e., the second preset value), the energy storage system is prohibited from charging when the SOC is within this range.

[0048] Therefore, when the energy storage manufacturer provides a high SOC protection upper limit (the preset SOC upper limit) < energy storage system SOC < 100% (i.e., the second preset value), and the energy storage optimization command is less than 0, the first analog switch outputs 0, that is, it outputs an energy storage system charging prohibition command.

[0049] When the energy storage SOC is within a suitable range, i.e., the lower limit of low SOC protection provided by the energy storage manufacturer < the energy storage system SOC < the upper limit of high SOC protection provided by the energy storage manufacturer, the energy storage power command... =Energy Storage Optimization Command The first analog switch outputs an energy storage power command that is not subject to energy storage optimization rate limitation, and the energy storage system can participate in regulation.

[0050] When the OR gate module outputs a signal of 1, the first analog switch selects the value of the first analog generator as its output, that is, the first analog switch outputs 0, which means that the SOC of the energy storage system is too high or too low. At this time, the energy storage system is prohibited from charging or discharging. When the OR gate module outputs a signal of 0, the first analog switch outputs an energy storage power command that is not limited by the energy storage optimization rate, indicating that the SOC of the energy storage system is within a suitable range.

[0051] Specifically, when the output of the first detection unit is 1 (i.e., the optimization instruction of the energy storage system 400 is less than 0, requiring the energy storage system 400 to charge), and the SOC range of the energy storage system is: the upper limit of SOC high power protection provided by the energy storage manufacturer < SOC < 100%, then the output of the second AND gate is 1, the output of the third AND gate is 1, and the output of the OR gate module is 1.

[0052] When the output of the second detection unit is 1 (i.e., the energy storage system 400 optimization command is greater than 0, requiring the energy storage system 400 to discharge), and the SOC range of the energy storage system is: 0% < SOC < the lower limit value of SOC protection provided by the energy storage manufacturer, the output of the first AND gate is 1, the output of the fourth AND gate is 1, that is, the output of the OR gate module is 1.

[0053] In either of the above two scenarios, if the condition is not met (i.e., the OR gate module output is 0), the first analog switcher outputs the target energy storage power command without energy storage optimization rate limitation, and the energy storage system 400 can participate in the regulation. If the OR gate module output is 1, the first analog switcher outputs a prohibition charge / discharge command and sends the prohibition charge / discharge command to the first rate limitation module 203.

[0054] The energy storage power command without energy storage optimization rate limitation passes through the first rate limitation module 203 and enters the energy storage power command generation module 204 to obtain the target energy storage power command after energy storage optimization rate limitation, and sends it to the energy storage system 400. The energy storage system 400 adjusts the energy storage output according to the energy storage power command to obtain the actual energy storage power.

[0055] Optionally, in some embodiments, the first rate limiting module 203 includes: a second to a fifth analog switch, wherein, when the target frequency modulation mode is the basic frequency modulation mode, the second analog switch is used to acquire the charge / discharge rate of the energy storage system 400 and the basic frequency modulation mode in the energy storage power command, and adjust the charge / discharge rate in the energy storage power command to a first energy storage optimized rate according to the basic frequency modulation mode; when the target frequency modulation mode is a fast response mode, the third analog switch is used to acquire the charge / discharge rate of the energy storage system 400 and the fast response mode, and the third analog switch is used to acquire the charge / discharge rate of the energy storage system 400 in the energy storage power command, and adjust the charge / discharge rate in the energy storage power command to a second energy storage optimized rate according to the fast response mode; when the target frequency modulation mode is a safe frequency modulation mode, the fourth analog switch is used to acquire the charge / discharge rate of the energy storage system 400 in the energy storage power command. The fourth analog switcher is used to adjust the charge and discharge rate in the energy storage power command to the third energy storage optimization rate based on the boiler water-cooled wall temperature and the safe frequency regulation mode. When the target frequency regulation mode is the deep regulation auxiliary mode, the fifth analog switcher is used to acquire the charge and discharge rate of the energy storage system 400, the deep regulation auxiliary mode, the predicted value of the automatic generation control command, the actual power generation of the thermal power unit 300, the state of charge of the energy storage system 400, and the energy storage optimization command in the energy storage power command, and adjust the charge and discharge rate in the energy storage power command to the fourth energy storage optimization rate based on the deep regulation auxiliary mode, the predicted value of the automatic generation control command, the actual power generation of the thermal power unit 300, the state of charge of the energy storage system 400, and the energy storage optimization command.

[0056] The first rate limiting module 203 is used to determine the target frequency regulation mode and adjust the energy storage power command according to the target energy storage optimization rate based on the target frequency regulation mode, so that the energy storage system 400 adjusts the energy storage output according to the target energy storage power command after the energy storage optimization rate is limited.

[0057] Specifically, the first rate limiting module 203 checks and processes the energy storage power command that has not been subject to energy storage optimization rate limiting according to the given rate limits (including the rising rate setting value and the falling rate setting value) and then outputs the command.

[0058] The rise rate setting value / fall rate setting value of the first rate limiting module 203 is determined by the selection input terminals of the second analog switch, the third analog switch, the fourth analog switch, and the fifth analog switch.

[0059] Specifically, such as Figure 2 As shown, the N terminal of the second analog switch is connected to the charge / discharge rate of the energy storage system, and the Y terminal is connected to the first energy storage optimization rate. Connect the input terminal to the basic frequency modulation mode;

[0060] The N terminal of the third analog switch is connected to the output terminal of the second analog switch, and the Y terminal is connected to the second energy storage optimization rate. Connect the input terminal to the fast response mode;

[0061] The N terminal of the fourth analog switch is connected to the output terminal of the third analog switch, and the Y terminal is connected to the third energy storage optimization rate. The input terminal is connected to the safety frequency modulation mode and the upper limit of the boiler water-cooled wall temperature. The boiler water-cooled wall is connected to the input of the fifth detection unit. The output of the fifth detection unit and the safety frequency modulation mode are respectively connected to the input of the fifth AND gate. The output of the fifth AND gate is connected to the selection input terminal of the fourth analog quantity switcher.

[0062] The N terminal of the fifth analog switch is connected to the output terminal of the fourth analog switch, and the Y terminal is connected to the fourth energy storage optimization rate. The input selection terminal is determined by the deep adjustment auxiliary mode, the predicted value of the scheduling AGC command, the actual power generated by the unit, the SOC of the energy storage system, and the energy storage optimization command. The output of the fifth analog quantity selection switch is connected to the rise rate setpoint / fall rate setpoint input of the first rate limiting module 203.

[0063] When the basic frequency regulation mode is activated, the second analog switch on the ITECCS side selects the first energy storage optimization rate. As the rate of change of energy storage power command without energy storage optimization rate limitation, the first energy storage optimization rate is utilized. The charging and discharging rates of the energy storage power command are adjusted, and the energy storage power command without energy storage optimization rate limitation is checked and processed through the rise rate setpoint / fall rate setpoint in the first rate limiting module 203 to obtain the target energy storage power command and send it to the energy storage system to obtain the actual energy storage power. In this mode, the first energy storage optimization rate The design principle is to be lower than the charging and discharging rate of the energy storage system. , where the rate The charge / discharge rate limit designed for the energy storage system itself.

[0064] When the fast response mode is activated, the third analog switch on the ITECCS side selects the second energy storage optimization rate. As the rate of change of energy storage power command without energy storage optimization rate limitation, the second energy storage optimization rate is utilized. The charging and discharging rates of the energy storage power command are adjusted, and the energy storage power command without energy storage optimization rate limitation is checked and processed through the rise rate setpoint / fall rate setpoint in the first rate limiting module 203 to obtain the target energy storage power command and send it to the energy storage system to obtain the actual energy storage power. In this mode, the second energy storage optimization rate The design principle is to maximize the rate of change that can be implemented.

[0065] When the safe frequency regulation mode is activated, and the fifth detection unit detects that the boiler water-cooled wall temperature exceeds the high-limit alarm value (this value can be adjusted according to the actual situation of each thermal power unit), the fourth analog quantity switch on the ITECCS side selects the third energy storage optimization rate. As the rate of change of energy storage power command without energy storage optimization rate limitation, and utilizing the third energy storage optimization rate The charging and discharging rates of the energy storage power command are adjusted, and the energy storage power command without energy storage optimization rate limitation is checked and processed through the rise rate setpoint / fall rate setpoint in the first rate limiting module 203 to obtain the target energy storage power command and send it to the energy storage system to obtain the actual energy storage power. In this mode, the third energy storage optimization rate The range of values ​​can be and between.

[0066] When the deep-tuning auxiliary mode is engaged and other judgment conditions are met, the fifth analog switch on the ITECCS side selects the fourth energy storage optimization rate. As the rate of change of energy storage power command without energy storage optimization rate limitation, and utilizing the fourth energy storage optimization rate The charging and discharging rates of the energy storage power command are adjusted, and the energy storage power command without energy storage optimization rate limitation is checked and processed through the rise rate setpoint / fall rate setpoint in the first rate limiting module 203 to obtain the target energy storage power command and send it to the energy storage system to obtain the actual energy storage power. In this mode, the fourth energy storage optimization rate The principle for determining the value is to ensure that the overall rate of the joint frequency modulation system meets the scheduling requirements during the deep peak shaving phase, and that it is less than [a certain value]. The aim is to reduce the charging rate and maximize the SOC margin of the energy storage system, thereby increasing the charging time of the energy storage system during the deep commissioning phase of the unit and indirectly extending the deep commissioning time of the thermal power unit 300.

[0067] Optionally, in some embodiments, the first rate limiting module 203 further includes: a third detection module, configured to send an adjustment command to a fourth analog switch when the target frequency regulation mode is a safe frequency regulation mode and the boiler water-cooled wall temperature is higher than a third preset value, so that the fourth analog switch adjusts the charge and discharge rate in the energy storage power command to the third energy storage optimization rate; and a fourth detection module, configured to send an adjustment command to a fifth analog switch when the target frequency regulation mode is a deep regulation auxiliary mode, and the predicted value of the automatic generation control command is less than the preset unit deep peak load setting, the current actual power generation of the thermal power unit 300 is greater than the preset unit deep peak load setting, the current state of charge of the energy storage system 400 is greater than the preset SOC lower limit, and the energy storage optimization command is less than 0, so that the fifth analog switch adjusts the charge and discharge rate in the energy storage power command to the fourth energy storage optimization rate.

[0068] It is understandable that in the deep adjustment auxiliary mode, the selection input of the fifth analog quantity switch is jointly determined by the deep adjustment auxiliary mode, the predicted value of the dispatch AGC command, the actual generated power of the unit, the SOC of the energy storage system, and the energy storage optimization command. Among them, the third detection module set by the first rate limiting module includes the fifth detection unit, and the fourth detection module includes the sixth, seventh, eighth, and ninth detection units.

[0069] The fifth detection unit is responsible for determining the temperature of the boiler water-cooled wall. When the boiler water-cooled wall temperature exceeds the high limit alarm value (this value can be adjusted according to the actual situation of each thermal power unit), the fifth detection unit outputs a value of 1.

[0070] The sixth detection unit is used to determine the trend of AGC commands in the future. When it is predicted that the future AGC command will be less than the unit's deep peak load setting, the output value of the sixth detection unit will be 1.

[0071] The seventh detection unit is mainly responsible for determining whether the actual power generated by the unit is greater than the deep peak load setting of the unit. When it is greater, the output value of the seventh detection unit is 1.

[0072] The eighth detection unit mainly determines whether the current SOC of the energy storage system 400 is higher than the low power protection lower limit of the SOC of the energy storage system 400. If it is higher, the eighth detection unit outputs 1.

[0073] The ninth detection unit mainly determines whether the energy storage optimization command causes the energy storage system to charge at 400. That is, if the energy storage optimization command is less than 0, the output of the ninth detection unit is 1.

[0074] The predicted value of the dispatch AGC command is connected to the input of the sixth detection unit; the actual generated power of the unit is connected to the input of the seventh detection unit; the SOC of the energy storage system is connected to the input of the eighth detection unit; the energy storage optimization command is connected to the input of the ninth detection unit; the outputs of the deep adjustment auxiliary mode and the sixth, seventh, eighth, and ninth detection units are respectively connected to the input of the sixth AND gate; the output of the sixth AND gate is connected to the selection input of the fifth analog selector. When the output of the sixth AND gate is 1, the fifth analog selector selects... As an output; when the output of the sixth AND gate is 0, the fifth analog selector selects another rate of the N-terminal input as the output.

[0075] Among them, the setting value in the sixth detection unit in the deep peak load shaving auxiliary mode can be set according to the deep peak load limit of each unit; the setting value in the seventh detection unit is in principle the same as the setting value in the sixth detection unit; the setting value in the eighth detection unit can refer to the lower limit of the SOC protection of the energy storage system, and it is recommended to be slightly higher than the lower limit in the third detection unit; the setting value of the ninth detection unit is 0, which is used to determine the charging status of the energy storage system.

[0076] The thermal power unit 300 includes: a second acquisition module 301, used to acquire automatic power generation control commands and target unit optimized rates; a limiting module 302, used to limit the automatic power generation control commands to a preset adjustable range; a second rate limiting module 303, used to determine the target frequency regulation mode and limit the rate of the automatic power generation control commands that have been limited by upper and lower limits according to the target unit optimized rates, to obtain the target unit load commands, and output them to the unit load command module 304; the unit load command module 304 is used to output the target unit load commands to the thermal power unit 300, so that the thermal power unit 300 operates according to the target unit load commands.

[0077] On the 300 side of the thermal power unit, such as Figure 3 As shown, the DCS receives the automatic generation control command from the dispatcher and uses the limiting module 302 to limit the upper and lower limits of the automatic generation control command to avoid exceeding the adjustable range of the unit's AGC mode.

[0078] The second rate limiting module 303 further adjusts the automatic power generation control command rate to the target unit's optimized rate according to the automatic power generation control command and the target frequency regulation mode. After the second rate limit module 303 checks and processes the data according to the target unit's optimized rate, the target unit load command is generated as the set value for the main control of the air, coal, water and steam turbine of the thermal power unit 300. After execution by the thermal power unit 300 control system, the actual power generation of the thermal power unit 300 is obtained.

[0079] Optionally, in some embodiments, the second rate limiting module 303 includes: a sixth to a ninth analog switch, wherein, when the target frequency regulation mode is the basic frequency regulation mode, the sixth analog switch is used to acquire the automatic generation control command rate and the basic frequency regulation mode, and adjust the automatic generation control command rate to the first unit optimized rate according to the basic frequency regulation mode; when the target frequency regulation mode is the fast response mode, the seventh analog switch is used to acquire the automatic generation control command rate and the fast response mode, and adjust the automatic generation control command rate to the second unit optimized rate according to the fast response mode; when the target frequency regulation mode is the safe frequency regulation mode, the eighth analog switch is used to acquire the automatic generation control command rate and the safe frequency regulation mode, and adjust the automatic generation control command rate to the third unit optimized rate according to the safe frequency regulation mode; when the target frequency regulation mode is the deep frequency regulation auxiliary mode, the ninth analog switch is used to acquire the automatic generation control command rate and the deep frequency regulation auxiliary mode, and adjust the automatic generation control command rate to the fourth unit optimized rate according to the deep frequency regulation auxiliary mode.

[0080] The second rate limiting module 303 checks and processes the AGC instructions that have been limited by the upper and lower values ​​according to the given optimized rate (including the rise rate setpoint (VRlimit) and the fall rate setpoint (VLlimit)) and then outputs the results.

[0081] The rise rate setting value / fall rate setting value of the second rate limiting module 303 is determined by the selection input terminals of the sixth analog switch, the seventh analog switch, the eighth analog switch, and the ninth analog switch.

[0082] The N terminal of the sixth analog switch and the AGC command rate Connected, the Y-end is optimized with the first unit's speed. Connect the input terminal to the basic frequency modulation mode; connect the N terminal of the seventh analog switch to the output terminal of the sixth analog switch, and connect the Y terminal to the second unit's optimized rate. Connect the input terminal to the fast response mode; connect the N terminal of the eighth analog switch to the output terminal of the seventh analog switch, and connect the Y terminal to the third unit's optimized rate. Connect the input terminal to the safe frequency modulation mode; connect the N terminal of the ninth analog switch to the output terminal of the eighth analog switch, and connect the Y terminal to the fourth unit's optimized rate. The input terminal is connected to the deep adjustment auxiliary mode, and the output of the ninth analog quantity selection switch is connected to the rise / fall rate setpoint input of the second rate limiting module 303.

[0083] Specifically, when energy storage assists in frequency regulation of thermal power units, the frequency regulation method on the thermal power unit side is as follows:

[0084] When the basic frequency regulation mode is activated, the sixth analog switch on the thermal power unit side selects the optimized rate of the first unit. As the rate of change of AGC commands, the rate of automatic generation control commands is adjusted to the first unit's optimized rate. The first unit's optimized rate As the set value for the rise / fall rate of the second rate limiting module 303, the AGC command that has passed the upper and lower limit limits is checked and processed to obtain the target unit load command and send it to the thermal power unit to obtain the actual generating power of the thermal power unit. In this mode, the first unit's optimized rate... The design principle can be less than the maximum load change rate that a thermal power unit can perform.

[0085] When the fast response mode is activated, the seventh analog quantity switch on the thermal power unit side selects the second unit's optimized rate under the fast response mode. As the rate of change of AGC commands, the automatic generation control command rate is adjusted to the second unit's optimized rate. The second unit's optimized rate As the set value for the rise / fall rate of the second rate limiting module, the AGC commands that have passed the upper and lower limits are checked and processed to obtain the target unit load command and send it to the thermal power unit to obtain the actual generating power of the thermal power unit. In this mode, the second unit's optimized rate To maximize the achievable variable load rate, thereby maximizing the variable load rate of the joint frequency regulation system.

[0086] When the safe frequency regulation mode is activated, the eighth analog quantity switch on the thermal power unit side selects the third unit's optimized rate under the safe frequency regulation mode. As the rate of change of AGC commands, the rate of automatic generation control commands is adjusted to the optimized rate of the third unit. The third unit's optimized rate As the set value for the rise / fall rate of the second rate limiting module, the AGC commands that have passed the upper and lower limits are checked and processed to obtain the target unit load command and send it to the thermal power unit to obtain the actual generating power of the thermal power unit. In this mode, the third unit's optimized rate The value can be lower than the normal operating rate, that is < Appropriately increase , reduce The aim is to reduce the regulation rate of thermal power units, thereby reducing the risk of boiler water-cooled wall overheating and ensuring the load response rate of the joint frequency regulation system.

[0087] When the deep adjustment auxiliary mode is activated, the ninth analog quantity switch on the thermal power unit side selects the fourth unit's optimized rate under the deep adjustment auxiliary mode. As the rate of change of AGC commands, the automatic generation control command rate is adjusted to the optimized rate of the fourth unit. The fourth unit's optimized rate As the set value for the rise / fall rate of the second rate limiting module, the AGC commands that have passed the upper and lower limits are checked and processed to obtain the target unit load command and send it to the thermal power unit to obtain the actual generating power of the thermal power unit. In this mode, the fourth unit's optimized rate The value can be set according to the rate that the unit can execute during the deep peak shaving phase.

[0088] The combined power output of the thermal power unit (300 kW) and the energy storage system (400 kW) is calculated by summing the two values ​​to obtain the combined thermal and energy storage power. This combined power output is then transmitted to the dispatch center via the remote control device (TDC) 100. Figure 4 As shown.

[0089] The parameters in this embodiment of the invention have the following meanings: Scheduling AGC instruction: Actual generating power of the unit: Unit load command: Energy storage system charge / discharge rate: Actual power output of the energy storage system: Combined thermal power generation: AGC command rate for thermal power units: Energy storage optimization instructions: Energy storage power command: First energy storage optimization rate under basic frequency regulation mode: Optimized rate of the first unit under basic frequency regulation mode: Second energy storage optimization rate in fast response mode: ; Optimized rate of the second unit in fast response mode: Third energy storage optimization rate under safe frequency regulation mode: ; Optimized rate of the third unit under safe frequency regulation mode: Fourth energy storage optimization rate in deep-tuning auxiliary mode: ; Optimized rate of the fourth unit under deep adjustment auxiliary mode: .

[0090] Among them, the charge and discharge rate of the above-mentioned energy storage system The AGC command rate of the thermal power unit is set by the energy storage system 400. Set by the operator; First energy storage optimization rate Optimized rate of the first unit Second energy storage optimization rate Optimization rate of the second unit Third energy storage optimization rate Optimization rate of the third unit Fourth energy storage optimization rate Optimization rate of the fourth unit Based on the characteristics of four modes—basic frequency regulation mode, fast response mode, safe frequency regulation mode, and deep frequency regulation auxiliary mode—and the system characteristics of the energy storage system 400 and the thermal power unit 300, the ITECCS system sets the speed. ,rate ,rate ,rate The data is transmitted to thermal power unit 300 for calculation via communication.

[0091] It should be noted that the basic frequency regulation mode refers to the joint frequency regulation of thermal power units and energy storage systems according to their own regulation characteristics and their conventional set rates to achieve response to dispatch AGC commands; the fast response mode refers to fully mobilizing the variable load regulation capabilities of the units themselves and the energy storage systems to maximize the response rate of the combined thermal power and energy storage power to AGC commands, achieving the fastest response to grid load dispatch targets; the safe frequency regulation mode refers to achieving deep coupling of the joint frequency regulation of the thermal power and energy storage systems and response to AGC commands, with the constraint of improving the operational safety of thermal power unit equipment and reducing the risk of boiler tube wall overheating during the rapid frequency regulation of the units; and the deep regulation auxiliary mode refers to making full use of the energy storage capacity advantage to assist thermal power units in reducing the peak shaving depth, extending the deep peak shaving duration, and improving the regulation performance of the joint frequency regulation system to a certain extent, meeting the response requirements of dispatch AGC commands during the deep regulation stage.

[0092] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0093] Example 1:

[0094] like Figure 2 As shown, on the ITECCS side, ITECCS will receive the scheduling AGC instructions. and the actual power generation of the unit The difference is calculated using an adder, and then the energy storage optimization command is generated using a piecewise linear function generator, namely:

[0095] The deviation between the dispatch AGC command and the actual generated power of the unit is = ,when The unit increases its load; when The unit reduces its load. The main function of the piecewise linear function generator is to set the adjustment dead zone to avoid frequent adjustments by the energy storage system, which would affect the service life of the energy storage system.

[0096] After passing through the piecewise function generator, energy storage optimization instructions are generated. ,when When the unit increases load, the energy storage system discharges; When the unit reduces its load, the energy storage system charges; When the value equals 0, the unit load is stable and the actual generated power tracks the AGC command. At this time, the energy storage system neither charges nor discharges.

[0097] Energy storage optimization instructions The N-terminal input of the first analog switch is the first analog generator, and the Y-terminal input of the first analog switch is the first analog generator, which is set to 0. The output of the first analog switch is the energy storage power command without energy storage optimization rate limitation.

[0098] Based on the lower and upper limits of the energy storage optimization command and the lower and upper limits of the energy storage system's SOC, the value of the digital input terminal of the first analog quantity switch is determined, thereby determining which of the two analog inputs, N and Y, will be used as the output.

[0099] The overall design concept of the selection and judgment loop of the first analog switch is as follows: the energy storage power command is limited by the SOC state of the energy storage system, and its purpose is to protect the performance of the energy storage system. When the energy storage system is at the lower limit of SOC protection (low charge) or the upper limit of protection (high charge), the energy storage system is prohibited from discharging or charging, that is, the energy storage power command... =0; When the energy storage SOC is in the normal range, i.e., the lower limit of SOC protection < SOC < the upper limit of SOC protection, the energy storage power command is 0. =Energy Storage Optimization Command .

[0100] The first detection unit in the first detection module sets a first lower limit design value of 0, and the second detection unit sets a first upper limit design value of 0. The purpose is to determine the energy storage optimization command. The sign of the signal determines whether the system needs to be discharged or charged.

[0101] The SOC (State of Charge) range for energy storage is generally 0%-100%. Therefore, the second lower limit design value set in the third detection unit is the lower limit value of SOC low power protection provided by the energy storage manufacturer, and the second upper limit design value in the third detection unit is equal to 0%. The third lower limit design value in the fourth detection unit is 100%, and the third upper limit design value in the fourth detection unit is equal to the upper limit value of SOC high power protection provided by the energy storage manufacturer.

[0102] Therefore, when the OR gate module outputs a signal of 0, the first analog switch selects the energy storage optimization command as its output, i.e., the energy storage power command. =Energy Storage Optimization Command When the OR gate module outputs a signal of 1, the first analog switch selects the value of the first analog generator as its output, i.e., the energy storage power command. =0, meaning the energy storage system neither discharges nor charges.

[0103] Energy storage power commands without energy storage optimization rate limiting are processed by the first rate limiting module 203 at a given rate. The system checks and processes energy storage power commands that are not subject to energy storage optimization rate limits, obtains the target energy storage power command, and sends it to the energy storage system, ultimately obtaining the actual energy storage power.

[0104] Based on the DCS of thermal power units, such as Figure 3 As shown, the DCS receives the scheduling AGC instruction. It also limits the upper and lower limits of AGC commands, and uses the second rate limiting module 303 to set the rate according to the given AGC command. (i.e., the target unit optimized rate) The AGC commands, after being limited by upper and lower limits, are checked and processed to obtain the target unit load command, which serves as the setpoint for the thermal power unit's air, coal, water, and turbine main control, ultimately yielding the actual generating power of the thermal power unit. AGC command rate Set values ​​for thermal power unit operators.

[0105] The further design principles and structure of the above scheme are as follows: Figure 4 The sum of the actual generated power of thermal power units and the actual generated power of energy storage systems is taken as the combined thermal-storage power: , respond to scheduling AGC commands.

[0106] In summary, the multi-mode switching intelligent thermal power and energy storage joint frequency regulation control method designed in this invention is specifically as follows:

[0107] When the basic frequency regulation mode is activated, the second analog switch on the ITECCS side selects the first energy storage optimization rate. The rate of change of the energy storage power command is used as the basis for determining the target energy storage power command after optimization and rate limiting, which is then sent to the energy storage system to obtain the actual energy storage power. The sixth analog quantity switch on the thermal power unit side selects the first unit's optimized rate under the basic frequency regulation mode. The rate of change of the AGC command is used to send the target unit load command after optimization rate limiting to the thermal power unit, thus obtaining the actual generating power of the thermal power unit. In this mode, the first energy storage optimization rate The design principle is less than the rate. The first unit's optimized rate The design principle can be less than the maximum load change rate that a thermal power unit can perform.

[0108] When the fast response mode is activated, the third analog switch on the ITECCS side selects the second energy storage optimization rate. The rate of change of the energy storage power command is used as the basis for determining the target energy storage power command after optimization and rate limiting, which is then sent to the energy storage system to obtain the actual energy storage power. The seventh analog quantity switch on the thermal power unit side selects the second unit's optimized rate in fast response mode. The rate of change of the AGC command is used to send the target unit load command after optimization rate limiting to the thermal power unit, thus obtaining the actual generating power of the thermal power unit. In this mode, the second energy storage optimization rate The design principle is based on the maximum feasible rate of change, and the second unit's optimized rate. To maximize the load change rate of the unit, thereby maximizing the load change rate of the combined frequency regulation system.

[0109] When the safe frequency regulation mode is activated and the boiler water-cooled wall temperature exceeds the high-limit alarm value (this value can be adjusted according to the actual situation of each thermal power unit), the fourth analog switch on the ITECCS side selects the third energy storage optimization rate. The rate of change of the energy storage power command is used as the basis for determining the target energy storage power command after optimization and rate limiting, which is then sent to the energy storage system to obtain the actual energy storage power. The eighth analog switch on the thermal power unit side selects the third unit's optimized rate under safe frequency regulation mode. The rate of change of the AGC command is used to send the target unit load command after optimization rate limiting to the thermal power unit, thus obtaining the actual generating power of the thermal power unit. In this mode, the third energy storage optimization rate The range of values ​​can be and Between, the third unit's optimized rate The value can be lower than the normal operating rate, that is < Appropriately increase , reduce The aim is to reduce the regulation rate of thermal power units, thereby reducing the risk of boiler water-cooled wall overheating and ensuring the load response rate of the joint frequency regulation system.

[0110] When the deep-tuning auxiliary mode is engaged and other judgment conditions are met, the fifth analog switch on the ITECCS side selects the fourth energy storage optimization rate. The rate of change of the energy storage power command is used as the basis for determining the target energy storage power command after optimization and rate limiting, which is then sent to the energy storage system to obtain the actual energy storage power. The ninth analog quantity switch on the thermal power unit side selects the fourth unit's optimized rate under deep adjustment auxiliary mode. The rate of change of the AGC command is used to send the target unit load command after optimization rate limiting to the thermal power unit, thus obtaining the actual generating power of the thermal power unit. In this mode, the fourth energy storage optimization rate The principle for determining the value is to ensure that the overall rate of the joint frequency modulation system meets the scheduling requirements during the deep peak shaving phase, and that it is less than [a certain value]. The fourth unit's optimized rate The value can be set according to the rate that the unit can execute during the deep peak shaving phase. The purpose is to maximize the SOC margin of the energy storage system, so that the charging time of the energy storage system can be increased during the deep shaving phase of the unit, thereby indirectly extending the deep shaving duration of the thermal power unit.

[0111] Example 2:

[0112] like Figure 5 As shown, Figure 5 This is a schematic diagram of an expandable intelligent thermal power and energy storage joint frequency regulation control system architecture in an embodiment of the present invention, based on a multi-mode switching intelligent thermal power and energy storage joint frequency regulation control method and system. It extends the system functionality of Embodiment 1, and its system communication architecture includes:

[0113] The dispatching AGC commands are sent to the DCS and ITECCS of the thermal power units via remote control devices. ITECCS obtains unit operating information from the DCS of thermal power unit 1, DCS of thermal power unit 2, ..., and nDCS of thermal power unit, including analog signals required for automatic adjustment such as actual power generation, unit load change rate, and boiler water-cooled wall temperature, as well as switch signals required for AGC activation / deactivation and ITECCS system activation / deactivation. It then sends the optimized rate of the automatic generation control commands for each unit and the energy storage system operating information to the DCS of thermal power unit 1, DCS of thermal power unit 2, ..., and nDCS of thermal power unit, including key analog signals such as optimized load change rates, actual power generation of energy storage, and energy storage activation status. Key analog and digital signals: The ITECCS obtains energy storage operation information from the energy storage system, including key analog and digital signals such as energy storage status, chargeable / dischargeable power, and actual energy storage output. It then sends the generated energy storage power command to the energy storage system EMS. When the dispatch AGC command changes, the ITECCS and the thermal power unit 1DCS, thermal power unit 2DCS, ..., thermal power unit nDCS respond and perform calculations simultaneously, automatically adjusting the output of the thermal power unit and the energy storage system. The remote control unit receives the unit operation information sent by the thermal power unit 1DCS, thermal power unit 2DCS, ..., thermal power unit nDCS and the thermal power-storage operation information sent by the ITECCS, and sends the combined thermal power-storage power to the dispatch center to complete the response to the AGC command of each unit.

[0114] In this embodiment, the selection of the number of thermal power units needs to be combined with the configuration capacity of the energy storage system. That is, in the first embodiment, all energy storage units assist one thermal power unit in frequency regulation. In this embodiment, the energy storage system can be divided into 1 set, 2 sets, ..., n sets to assist thermal power unit 1, thermal power unit 2, ..., thermal power unit n in frequency regulation according to the actual situation.

[0115] This embodiment focuses on a smart thermal and energy storage combined frequency regulation control method based on multi-mode switching and the system's expandability. Regardless of how many units are expanded, the design principle of the main control strategy is the same as in Embodiment 1, and all are integrated in ITECCS.

[0116] The technical solutions of the present invention are not limited to the above embodiments. All technical solutions obtained by equivalent substitution fall within the scope of protection claimed by the present invention.

[0117] According to the intelligent thermal-storage joint frequency regulation control system based on multi-mode switching proposed in this embodiment of the invention, an automatic power generation control command is sent to the intelligent thermal-storage joint control system and the thermal power unit via a remote control device. The first acquisition module of the intelligent thermal-storage joint control system acquires the automatic power generation control command, the operating information of the thermal power unit, and the operating information of the energy storage system. An optimization command generation module generates energy storage optimization commands based on the automatic power generation control command and the actual power output of the thermal power unit. A first rate limiting module determines the target frequency regulation mode and adjusts the energy storage power command according to the target energy storage optimization rate based on the target frequency regulation mode. An energy storage power command generation module enables the energy storage system to adjust its energy storage output according to the target energy storage power command. A second acquisition module of the thermal power unit acquires the automatic power generation control command and the automatic power generation control command optimization rate, and a limiting module limits the upper and lower limits of the automatic power generation control command. A second rate limiting module determines the target frequency regulation mode and adjusts the automatic power generation control command rate to the target unit optimization rate according to the target frequency regulation mode. A unit load command module enables the thermal power unit to adjust its output according to the target unit load command. The combined output of the energy storage system and the thermal power unit responds to the automatic power generation control command. This solves the problem that existing energy storage-assisted frequency regulation modes are basically independent of main unit AGC frequency regulation and energy storage frequency regulation, without considering how to deeply couple the two to give full play to the efficient regulation capabilities of thermal power and energy storage. It alleviates the pressure of long-term, frequent and rapid frequency regulation of thermal power units, reduces the risk of boiler water-cooled wall overheating, and efficiently and flexibly gives full play to the regulation characteristics of thermal power units and energy storage systems, maximizing the joint frequency regulation capability of thermal power and energy storage systems.

[0118] Next, referring to the accompanying drawings, we describe the intelligent fire-storage joint frequency regulation control method based on multi-mode switching proposed in the embodiments of the present invention.

[0119] Figure 6 This is a block diagram of an intelligent fire-storage joint frequency regulation control method based on multi-mode switching according to an embodiment of the present invention.

[0120] like Figure 6 As shown, the intelligent thermal power and energy storage joint frequency regulation control method based on multi-mode switching adopts the aforementioned intelligent thermal power and energy storage joint frequency regulation control system based on multi-mode switching. The method includes the following steps:

[0121] In step S601, an automatic power generation control command is received, and the target frequency regulation mode is determined.

[0122] In step S602, based on the automatic generation control command, the target frequency regulation mode, and the SOC state of the energy storage system, the energy storage optimization command, the target energy storage optimization rate, and the target unit optimization rate of the thermal power unit are determined, thereby obtaining the target energy storage power command and the target unit load command.

[0123] In step S603, the control energy storage system adjusts its output based on the target energy storage power command, and controls the thermal power unit to operate according to the target unit load command, so as to realize the rapid response of the combined thermal and energy storage output to the automatic power generation control command.

[0124] It should be noted that the foregoing explanation of the embodiment of the intelligent thermal energy storage joint frequency regulation control system based on multi-mode switching also applies to the intelligent thermal energy storage joint frequency regulation control method based on multi-mode switching in this embodiment, and will not be repeated here.

[0125] The intelligent thermal power-storage joint frequency regulation control method based on multi-mode switching proposed in this invention receives automatic generation control commands and determines the target frequency regulation mode. Based on the automatic generation control commands, the target frequency regulation mode, and the SOC state of the energy storage system, it determines the energy storage optimization command, the target energy storage optimization rate, and the target unit optimization rate of the thermal power unit, thereby obtaining the target energy storage power command and the target unit load command. It controls the energy storage system to adjust its output based on the target energy storage power command and controls the thermal power unit to operate according to the target unit load command, achieving a rapid response of the combined thermal power-storage output to the automatic generation control commands. Therefore, it can efficiently and flexibly utilize the regulation characteristics of the thermal power unit and the energy storage system, maximizing the combined frequency regulation capability of the thermal power-storage system.

[0126] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0127] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "N" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0128] Any process or method description in the flowchart or otherwise herein can be understood as representing a module, segment, or portion of code comprising one or more N executable instructions for implementing custom logic functions or processes, and the scope of preferred embodiments of the invention includes additional implementations in which functions may be performed not in the order shown or discussed, including substantially simultaneously or in reverse order depending on the functions involved, as should be understood by those skilled in the art to which embodiments of the invention pertain.

[0129] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequential list of executable instructions for implementing logical functions, and can be specifically implemented in any computer program product for use by, or in conjunction with, an instruction execution system, apparatus, or device (such as a computer-based system, a processor-included system, or other system that can fetch and execute instructions from, an instruction execution system, apparatus, or device). For the purposes of this specification, "computer program product" can be any means that can contain, store, communicate, propagate, or transmit a program for use by, or in conjunction with, an instruction execution system, apparatus, or device. More specific examples of computer program products (a non-exhaustive list) include the following: an electrical connection having one or N wires (electronic device), a portable computer disk drive (magnetic device), random access memory (RAM), read-only memory (ROM), erasable and editable read-only memory (EPROM or flash memory), fiber optic device, and portable optical disc read-only memory (CDROM). Furthermore, the computer program product can even be paper or other suitable medium on which the program can be printed, because the program can be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, interpreting, or otherwise processing as necessary, and then stored in a computer memory.

[0130] It should be understood that various parts of the present invention can be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the N steps or methods can be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware as in another embodiment, it can be implemented using any of the following techniques known in the art, or a combination thereof: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0131] Those skilled in the art will understand that all or part of the steps of the methods in the above embodiments can be implemented by a program instructing related hardware. The program can be stored in a computer program product, and when executed, the program includes one or a combination of the steps of the method embodiments.

[0132] Furthermore, the functional units in the various embodiments of the present invention can be integrated into a processing module, or each unit can exist physically separately, or two or more units can be integrated into a module. The integrated module can be implemented in hardware or as a software functional module. If the integrated module is implemented as a software functional module and sold or used as an independent product, it can also be stored in a computer program product.

[0133] The computer program product mentioned above can be a read-only memory, a disk, or an optical disk, etc. Although embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

Claims

1. A smart thermal power and energy storage combined frequency regulation control system based on multi-mode switching, characterized in that, The system includes a remote control unit, an intelligent thermal power generation and energy storage coordinated control system, a thermal power unit, and an energy storage system. The remote control unit is connected to both the intelligent thermal power generation and energy storage coordinated control system and the thermal power unit, and is used to send automatic power generation control commands to both systems. The intelligent thermal power generation and energy storage coordinated control system includes: The first acquisition module is used to acquire automatic power generation control commands, the operating information of the thermal power unit and the operating information of the energy storage system; An optimization instruction generation module is provided, the input of which is connected to the first acquisition module, and is used to generate energy storage optimization instructions based on the automatic power generation control instructions and the actual power generation of the thermal power unit. The first rate limiting module, whose input is connected to the output of the optimization instruction generation module and whose output is connected to the energy storage power instruction generation module, is used to determine the target frequency regulation mode and then determine the target energy storage optimization rate corresponding to the target frequency regulation mode. An energy storage power command generation module, wherein the input end of the energy storage power command generation module is connected to the output end of the first rate limiting module, is used to adjust the energy storage power command according to the target frequency regulation mode and the target energy storage optimization rate to obtain the target energy storage power command after being limited by the target energy storage optimization rate. The first rate limiting module includes: a second analog switch to a fifth analog switch, wherein, When the target frequency modulation mode is the basic frequency modulation mode, the second analog switcher obtains the charging and discharging rate of the energy storage system and the basic frequency modulation mode in the energy storage power command, and adjusts the charging and discharging rate of the energy storage system in the energy storage power command that has not been limited by the first rate limiting module to the first energy storage optimized rate according to the basic frequency modulation mode. The first energy storage optimized rate is less than the charging and discharging rate of the energy storage system. When the target frequency modulation mode is the fast response mode, the third analog switcher acquires the charging and discharging rate and fast response mode of the energy storage system, and adjusts the charging and discharging rate of the energy storage system in the energy storage power command that has not been limited by the first rate limiting module to the second energy storage optimization rate according to the fast response mode. The second energy storage optimization rate is the preset maximum executable change rate. When the target frequency regulation mode is the safe frequency regulation mode, the fourth analog quantity switcher obtains the charging and discharging rate of the energy storage system, the boiler water-cooled wall temperature, and the safe frequency regulation mode in the energy storage power command. The fourth analog quantity switcher adjusts the charging and discharging rate of the energy storage system in the energy storage power command that has not been limited by the first rate limiting module to the third energy storage optimization rate according to the boiler water-cooled wall temperature and the safe frequency regulation mode. The third energy storage optimization rate is between the first energy storage optimization rate and the second energy storage optimization rate. When the target frequency regulation mode is the deep regulation assisted mode, the fifth analog quantity switch acquires the charging and discharging rate of the energy storage system, the deep regulation assisted mode, the predicted value of the automatic generation control command, the actual power generation of the thermal power unit, the state of charge of the energy storage system, and the energy storage optimization command from the energy storage power command. Based on the deep regulation assisted mode, the predicted value of the automatic generation control command, the actual power generation of the thermal power unit, the state of charge of the energy storage system, and the energy storage optimization command, the charging and discharging rate of the energy storage system in the energy storage power command that has not been rate-limited by the first rate limiting module is adjusted to the fourth energy storage optimization rate, whereby the fourth energy storage optimization rate is less than the first energy storage optimization rate.

2. The intelligent thermal power and energy storage combined frequency regulation control system based on multi-mode switching according to claim 1, characterized in that, The intelligent fire and storage coordinated control system further includes: an adder and a function generator, wherein: The input of the adder is connected to the output of the first acquisition module, the output of the adder is connected to the input of the function generator, and the output of the function generator is connected to the input of the optimization instruction generation module. The adder calculates the difference between the received automatic power generation control command and the actual power generated by the unit, and inputs the difference to the function generator. When the function generator detects that the difference is greater than 1, it generates an energy storage optimization command for discharging the energy storage system. When it detects that the difference is less than -1, it generates an energy storage optimization command for charging the energy storage system. When it detects that the difference is in the range of -1 to 1, it outputs a command to prohibit charging and discharging.

3. The intelligent thermal power and energy storage combined frequency regulation control system based on multi-mode switching according to claim 2, characterized in that, The energy storage power command generation module includes: The first detection module is used to output a discharge command when the energy storage optimization command is detected to be greater than 0, and to output a charging command when the energy storage optimization command is detected to be less than 0. The second detection module is connected to the state of charge (SOC) of the energy storage system. It is used to detect whether the SOC of the energy storage system is higher than a first preset value and lower than a preset lower SOC limit. When the SOC of the energy storage system is detected to be higher than the first preset value and lower than the preset lower SOC limit, it outputs a discharge prohibition command. It is also used to detect whether the SOC of the energy storage system is higher than a preset upper SOC value and lower than a second preset value. When the SOC of the energy storage system is detected to be higher than the preset upper SOC value and lower than the second preset value, it outputs a charging prohibition command. The OR gate module is used to generate an energy storage power command or a charge / discharge prohibition command that is not rate-limited by the first rate limiting module, based on the output commands of the first detection module and the second detection module. The first analog quantity switcher has its input terminal connected to the output terminal of the OR gate module. It is used to receive the output of the OR gate module and determine the energy storage optimization command or the value of the first analog quantity generator based on the output result of the OR gate module as the output value of the first analog quantity switcher. The output value is the energy storage power command that has not been rate-limited by the first rate limiting module. The energy storage power command that has not been rate-limited by the first rate limiting module is sent to the first rate limiting module. The target energy storage power command is obtained after being rate-limited by the target energy storage optimization module.

4. The intelligent thermal power and energy storage combined frequency regulation control system based on multi-mode switching according to claim 3, characterized in that, The first detection module includes: The first detection unit is used to detect whether the energy storage optimization command is lower than 0, and output the charging command when the energy storage optimization command is detected to be lower than 0. The second detection unit is used to detect whether the energy storage optimization command is higher than 0, and outputs the discharge command when the energy storage optimization command is detected to be higher than 0.

5. The intelligent thermal power and energy storage combined frequency regulation control system based on multi-mode switching according to claim 3, characterized in that, The second detection module includes: The third detection unit is used to output a discharge prohibition command when the state of charge of the energy storage system is detected to be higher than the first preset value and lower than the preset SOC lower limit value. The fourth detection unit is used to output a charging prohibition command when the state of charge of the energy storage system is detected to be higher than the preset SOC upper limit and lower than the second preset value.

6. The intelligent thermal power and energy storage combined frequency regulation control system based on multi-mode switching according to claim 1, characterized in that, The first rate limiting module further includes: The third detection module is used to send an adjustment command to the fourth analog quantity switch when the target frequency modulation mode is a safe frequency modulation mode and the boiler water-cooled wall temperature is higher than the third preset value, so that the fourth analog quantity switch adjusts the charging and discharging rate in the energy storage power command that has not been limited by the rate of the first rate limiting module to the third energy storage optimization rate. The fourth detection module is used to send an adjustment command to the fifth analog quantity switch when the target frequency regulation mode is deep regulation auxiliary mode, and the predicted value of the automatic power generation control command is less than the preset unit deep peak load setting, the current actual power generation of the thermal power unit is greater than the preset unit deep peak load setting, the current state of charge of the energy storage system is greater than the preset lower limit of SOC, and the energy storage optimization command is less than 0, so that the fifth analog quantity switch adjusts the charging and discharging rate in the energy storage power command that has not been limited by the rate limit of the first rate limit module to the fourth energy storage optimization rate.

7. The intelligent thermal power and energy storage combined frequency regulation control system based on multi-mode switching according to claim 1, characterized in that, The thermal power unit includes: The second acquisition module is used to acquire automatic generation control commands and the target unit's optimized rate. A limiting module is used to limit the upper and lower limits of the automatic power generation control command; The second rate limiting module is used to determine the target frequency regulation mode, and to limit the rate of the automatic generation control command after upper and lower limit restrictions according to the target unit optimized rate based on the automatic generation control command and the target frequency regulation mode, so as to obtain the target unit load command and output it to the unit load command module. The unit load command module is used to output the target unit load command to the thermal power unit.

8. The intelligent thermal power and energy storage combined frequency regulation control system based on multi-mode switching according to claim 7, characterized in that, The second rate limiting module includes: The sixth to the ninth analog switch, among which, When the target frequency regulation mode is the basic frequency regulation mode, the sixth analog quantity switch is used to acquire the automatic generation control command rate and the basic frequency regulation mode, and adjust the automatic generation control command rate to the first unit optimized rate according to the basic frequency regulation mode. When the target frequency regulation mode is the fast response mode, the seventh analog switch is used to acquire the automatic generation control command rate and the fast response mode, and adjust the automatic generation control command rate to the second unit optimization rate according to the fast response mode. When the target frequency regulation mode is the safe frequency regulation mode, the eighth analog quantity switch is used to acquire the automatic generation control command rate and the safe frequency regulation mode, and adjust the automatic generation control command rate to the third unit's optimized rate according to the safe frequency regulation mode. When the target frequency regulation mode is the deep adjustment auxiliary mode, the ninth analog quantity switch is used to obtain the automatic generation control command rate and the deep adjustment auxiliary mode, and adjust the automatic generation control command rate to the fourth unit optimization rate according to the deep adjustment auxiliary mode.

9. A multi-mode switching intelligent thermal power and energy storage joint frequency regulation control method, characterized in that, The method employs the intelligent thermal power and energy storage joint frequency regulation control system based on multi-mode switching as described in any one of claims 1-8, wherein the method includes: Receive automatic power generation control commands and determine the target frequency regulation mode; Based on the automatic generation control command, the target frequency regulation mode, and the SOC status of the energy storage system, the energy storage optimization command, the target energy storage optimization rate, and the target unit optimization rate of the thermal power unit are determined, and the target energy storage power command and the target unit load command are obtained. The control system adjusts the output of the energy storage system based on the target energy storage power command, and controls the operation of the thermal power unit according to the target unit load command, so as to realize the rapid response of the combined thermal and energy storage output to the automatic power generation control command.

Images