Power response optimization method and system of energy storage system under high-power load fluctuation

Abstract

The present application relates to the technical field of energy storage system control, and particularly relates to a power response optimization method and system of an energy storage system under large-power load fluctuation. The method comprises the following steps: monitoring a working state signal of at least one auxiliary device associated with a large-power load in real time, judging whether the auxiliary device enters a preparation starting stage based on the working state signal; when it is judged that the auxiliary device enters the preparation starting stage, generating and sending a first early warning control instruction to a converter, the converter responding to the first early warning control instruction and performing a first parameter preset operation, monitoring a main loop starting signal associated with the large-power load in real time, and when the main loop starting signal is monitored, generating and sending a second control instruction to the converter, the converter responding to the second control instruction. The response of the energy storage is changed from passive feedback to advanced feedforward, the power response time is greatly shortened, the voltage drop and frequency fluctuation of the energy storage system are effectively inhibited, and the adaptability of the system to the impact load is improved.

Description

Technical Field

[0001] This invention relates to the field of energy storage system control technology, specifically to a method and system for optimizing the power response of an energy storage system under high-power load fluctuations. Background Technology

[0002] In industrial settings such as mines, steel rolling mills, and ports, high-power impact loads such as ball mills, crushers, and cranes are widely present. The start-up and operation of such loads can cause severe power fluctuations and voltage drops in energy storage systems, seriously threatening the normal operation of other sensitive equipment on the same busbar, and may even lead to system instability.

[0003] Voltage source converters (PCS) for energy storage systems (energy storage converters with voltage source characteristics) are considered an effective means of solving this problem, as they can provide rapid power and voltage support for energy storage systems. However, the response of traditional PCS is based on real-time feedback of parameters such as voltage and frequency of the energy storage system. This passive response mode has inherent detection, calculation, and control delays (typically tens to hundreds of milliseconds), and often falls short when facing millisecond-level impacts from megawatt-level loads, offering limited support and failing to completely eliminate voltage sags.

[0004] In existing technologies, some solutions attempt to pre-schedule energy storage output by predicting load curves, but these are mostly based on long-term or medium-term predictions using historical data, which cannot accurately respond to random or planned single large load startup events. Therefore, there is an urgent need for a technical solution that can detect the intention of high-power load startup earlier and more accurately, and enable the energy storage system to respond quickly and proactively. Summary of the Invention

[0005] This invention aims to overcome the problem of delayed response to high-power load impacts in existing energy storage systems. Therefore, One of the objectives of this invention is to provide a power response optimization method for energy storage systems under high-power load fluctuations. This method achieves early warning and parameter preset by monitoring the status of the load auxiliary system, significantly shortening the power response time of the energy storage system and thus more effectively suppressing voltage fluctuations in the energy storage system.

[0006] The second objective of this invention is to provide a power response optimization system for energy storage systems under high power load fluctuations.

[0007] A third objective of this invention is to provide a computer-readable storage medium.

[0008] A fourth objective of this invention is to provide an electronic device.

[0009] One of the technical solutions adopted by this invention to achieve its objective is: a power response optimization method for an energy storage system under high-power load fluctuations, applied to an energy storage power station including a converter, the method comprising: Real-time monitoring of the operating status signal of at least one auxiliary device associated with a high-power load; based on the operating status signal, determining whether the auxiliary device has entered the preparation start-up phase; When it is determined that the auxiliary equipment has entered the preparation start-up stage, a first early warning control command is generated and sent to the converter. The converter responds to the first early warning control command and performs a first parameter preset operation. The first parameter preset operation includes: preset power output increment according to the predicted impact power of the high-power load, and adjust control parameters to enter a fast response preparation state. The system monitors at least one main circuit start signal associated with the high-power load in real time. When the main circuit start signal is detected, a second control command is generated and sent to the converter. The converter responds to the second control command and outputs supporting power to cope with the start-up impact of the high-power load based on the preset power output increment and control parameters in the first parameter preset operation.

[0010] Preferably, the operating status signal includes at least one of the following: the opening and closing status signal of the auxiliary equipment power circuit contactor and / or the operating status output signal of the auxiliary equipment frequency converter, and the active power value or current value of the auxiliary equipment. Determining whether the auxiliary equipment has entered the preparation for startup stage specifically includes: when the contactor of the auxiliary equipment power circuit is detected to be closed and / or the inverter of the auxiliary equipment is detected to be running, and the active power value or current value of the auxiliary equipment is detected to reach a preset threshold, then the auxiliary equipment is determined to have entered the preparation for startup stage.

[0011] Preferably, the main circuit start signal includes at least one of the following: the opening / closing status signal of the main circuit contactor and / or the operating status output signal of the main circuit frequency converter, and the active power value or current value consumed by the high-power load equipment.

[0012] When the main circuit contactor closing signal and / or the main circuit inverter operating status signal are detected to be running, and the active power or current value consumed by the high-power load device is detected to reach a preset threshold, it is determined that the high-power load device has entered the startup phase.

[0013] Preferably, the first early warning control command and the second control command are sent from the main control equipment of the energy storage power station to the converter via a wired industrial Ethernet or a wireless LoRa communication network.

[0014] Preferably, adjusting the control parameters to enter the fast response preparation state specifically includes: reducing the virtual droop coefficient of the converter and / or increasing the virtual inertia time constant of the converter.

[0015] Preferably, the method further includes: monitoring the operating status signal of the auxiliary equipment after the high-power load is started; when it is determined based on the operating status signal that the auxiliary equipment has been turned off, generating and sending a recovery command to the converter; the converter responds to the recovery command and restores the control parameters to the initial values ​​before the first parameter preset operation was executed.

[0016] The second technical solution adopted by the present invention to achieve the objective is: a power response optimization system for an energy storage system under high power load fluctuations, used to implement the method described above, the system comprising: A status monitoring module is configured to monitor in real time the operating status signal of at least one auxiliary device associated with a high-power load, and at least one main circuit start signal associated with the high-power load. The early warning judgment module is configured to determine whether the auxiliary equipment has entered the preparation start-up stage based on the working status signal of the auxiliary equipment. The main control device is communicatively connected to the status monitoring module and is configured to generate a first early warning control command based on the judgment result and a second control command based on the main circuit start signal. The converter is communicatively connected to the main control device and is configured to perform a first parameter preset operation in response to the first early warning control command and to output supporting power in response to the second control command.

[0017] Preferably, the status monitoring module includes a digital input unit for acquiring contactor signals of auxiliary equipment, an interface unit for acquiring inverter status signals of auxiliary equipment, an analog input unit or power transmitter for acquiring power or current values ​​of auxiliary equipment, a digital input unit for acquiring contactor signals of the main circuit, an interface unit for acquiring inverter status signals of the main circuit, and an analog input unit or power transmitter for acquiring power or current values ​​of the main circuit. The main control device communicates with the converter via an industrial Ethernet switch or a LoRa gateway.

[0018] The third objective of this invention is achieved by a computer-readable storage medium storing a computer program thereon, which, when executed by a processor, implements the method described thereon.

[0019] The fourth objective of this invention is achieved by the following technical solution: an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, it implements the method described above.

[0020] The core concept of this invention is that the startup of a high-power load (such as a high-voltage motor) is usually not an instantaneous action, but a sequential process comprising a "preparation phase" and a "startup phase." During the preparation phase, auxiliary equipment (such as lubrication pumps, cooling fans, hydraulic stations, etc.) starts up first. This invention gains valuable preparation time for the energy storage system by capturing this earlier "precursor signal" of auxiliary equipment startup.

[0021] The specific methods and steps include: First, monitor the operating status signals of auxiliary equipment associated with high-power loads in real time, such as contactor status, inverter output status, and active power.

[0022] Secondly, these signals are used to determine whether the auxiliary equipment has entered the preparation stage for startup. For example, this can be determined when the contactor closes and the equipment power reaches a certain threshold.

[0023] Then, once the auxiliary equipment is detected to be activated, an early warning signal is immediately sent to the main control equipment of the energy storage power station via communication methods such as Ethernet and LoRa.

[0024] The main control equipment then sends the first warning control command to the PCS. Upon receiving the command, the PCS does not immediately output full power, but instead performs the "first parameter preset operation": based on the predicted magnitude of the high-power load impact, it presets a power output increment; at the same time, and crucially, it adjusts its control parameters, such as reducing the virtual droop coefficient to enhance voltage support stiffness and increasing the virtual inertia time constant to improve system inertia, so that the PCS enters a "rapid response ready state".

[0025] Next, continue to monitor the main circuit start signal of the high-power load itself (such as the main motor high-voltage circuit breaker closing signal or the main circuit frequency converter status signal).

[0026] Upon receiving the main start signal, the main control device issues a second control command. At this point, the PCS, already in standby mode, can output support power based on a preset value with almost no delay using feedforward control, precisely offsetting the load start-up impact.

[0027] Finally, when the load is running stably or the system stops or the auxiliary equipment is turned off, the system can automatically restore the PCS parameters to their original state.

[0028] Compared with the prior art, the present invention has the following significant advantages: Extreme response speed: The response trigger point of the energy storage system is advanced from "load has started" to "load will start". Through parameter preset and feedforward control, the power support delay is shortened from hundreds of milliseconds to milliseconds, achieving near "zero delay" resistance to impact loads.

[0029] Precise support effect: Based on the understanding of specific load characteristics, a more suitable power output and better control parameters can be preset, so that the support strength and dynamic characteristics are more in line with actual needs, avoiding over-compensation or under-compensation.

[0030] System intelligence and self-adaptation: The method forms an intelligent closed loop of "monitoring-early warning-pre-setting-triggering", which transforms the energy storage system from a passive "bodyguard" to an active "steward", significantly improving the autonomous capability and operational quality of the energy storage system. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the power response optimization system of the energy storage system under high power load fluctuations according to the present invention. Figure 2 This is a flowchart illustrating the power response optimization method for energy storage systems under high-power load fluctuations according to the present invention. In the diagram: 101-High-power load, 102-Auxiliary equipment, 103-Status monitoring module, 104-Early warning and judgment module, 105-Main control equipment, 106-PCS, 107-Power grid / bus. Detailed Implementation

[0032] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0033] Example 1 In a first aspect, this embodiment discloses a power response optimization method for an energy storage system under high-power load fluctuations, applied to an energy storage power station including a converter, the method comprising: Step 1: Monitor the operating status signal of at least one auxiliary device associated with the high-power load in real time, and determine whether the auxiliary device has entered the preparation start-up stage based on the operating status signal; Step 2: When it is determined that the auxiliary equipment has entered the preparation start-up stage, a first early warning control command is generated and sent to the converter. The converter responds to the first early warning control command and executes a first parameter preset operation. The first parameter preset operation includes: preset the power output increment according to the predicted impact power of the high-power load, and adjust the control parameters to enter the fast response preparation state.

[0034] Step 3: Monitor at least one main circuit start signal associated with the high-power load in real time. When the main circuit start signal is detected, generate and send a second control command to the converter. The converter responds to the second control command and outputs supporting power to cope with the start-up impact of the high-power load based on the preset power output increment and control parameters in the first parameter preset operation.

[0035] In step 1, the operating status signal includes at least one of the following: the opening and closing status signal of the auxiliary equipment power circuit contactor and / or the operating status output signal of the auxiliary equipment frequency converter, and the active power value or current value of the auxiliary equipment.

[0036] In step 1, determining whether the auxiliary equipment has entered the preparation for startup stage specifically includes: when the contactor of the auxiliary equipment power circuit is detected to be closed and / or the inverter of the auxiliary equipment is detected to be running, and the active power value or current value of the auxiliary equipment is detected to reach a preset threshold, then the auxiliary equipment is determined to have entered the preparation for startup stage.

[0037] In step 3, the main circuit start signal includes at least one of the following: the opening and closing status signal of the main circuit contactor and / or the operating status output signal of the main circuit frequency converter, and the active power value or current value consumed by the high-power load equipment.

[0038] When the main circuit contactor closing signal and / or the main circuit inverter operating status signal are detected to be running, and the active power or current value consumed by the high-power load device is detected to reach a preset threshold, it is determined that the high-power load device has entered the startup phase.

[0039] In step 2, the first early warning control command and the second control command are sent from the main control equipment of the energy storage power station to the converter via a wired industrial Ethernet or wireless LoRa communication network.

[0040] The adjustment of control parameters to enter the fast response preparation state specifically includes: reducing the virtual droop coefficient of the converter, and / or increasing the virtual inertia time constant of the converter.

[0041] The method further includes step 4: after the high-power load is started, monitor the working status signal of the auxiliary equipment; when it is determined based on the working status signal that the auxiliary equipment has been turned off, generate and send a recovery command to the converter; the converter responds to the recovery command and restores the control parameters to the initial values ​​before the first parameter preset operation was executed.

[0042] Secondly, this embodiment discloses a power response optimization system for an energy storage system under high-power load fluctuations, used to implement the method described above, the system comprising: A status monitoring module is configured to monitor in real time the operating status signal of at least one auxiliary device associated with a high-power load, and at least one main circuit start signal associated with the high-power load. The early warning judgment module is configured to determine whether the auxiliary equipment has entered the preparation start-up stage based on the working status signal of the auxiliary equipment. The main control device is communicatively connected to the status monitoring module and is configured to generate a first early warning control command based on the judgment result and a second control command based on the main circuit start signal. The converter is communicatively connected to the main control device and is configured to perform a first parameter preset operation in response to the first early warning control command and to output supporting power in response to the second control command.

[0043] The status monitoring module includes a digital input unit for acquiring contactor signals of auxiliary equipment, an interface unit for acquiring inverter status signals of auxiliary equipment, an analog input unit or power transmitter for acquiring power or current values ​​of auxiliary equipment, a digital input unit for acquiring contactor signals of the main circuit, an interface unit for acquiring inverter status signals of the main circuit, and an analog input unit or power transmitter for acquiring power or current values ​​of the main circuit. The main control device communicates with the converter via an industrial Ethernet switch or a LoRa gateway.

[0044] Thirdly, this embodiment discloses a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the method described thereon.

[0045] Fourthly, this embodiment discloses an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the method described above.

[0046] Example 2 like Figure 1 As shown, the system architecture of this invention includes: a high-power load 101 (such as the main motor of a ball mill) and its key auxiliary equipment 102 (such as a high-pressure thin oil station). A status monitoring module 103 collects contactor signals, inverter status, and power signals from the auxiliary equipment 102 in real time, and simultaneously collects the closing signal of the main circuit breaker of the high-power load 101. These signals are sent to an early warning judgment module 104 for analysis. A main control device 105 (such as an energy management system for an energy storage power station) receives the output of the early warning judgment module 104 and the main circuit breaker signal, and generates corresponding control commands, which are then sent to the PCS 106 via a communication network. The PCS 106 is connected to a common bus 107, providing support for the energy storage system.

[0047] Example 3 like Figure 2 As shown, the optimization method flow of the present invention is as follows: Step S101: Continuously monitor the status signals of auxiliary equipment.

[0048] Step S102: Determine if the "ready to start" conditions are met. For example, the lubricating oil pump contactor is closed and its operating power is greater than the no-load power threshold (e.g., 20% of the rated power). If met, proceed to step S203; otherwise, continue monitoring.

[0049] Step S103: The main control device 105 sends a first early warning control command to PCS106 via the Modbus TCP protocol and industrial Ethernet. This command includes a preset power value ΔP (set based on historical data or load nameplate) and parameter adjustment commands.

[0050] Step S104: After receiving the command, PCS106 adjusts its virtual droop coefficient from K1 to a smaller K2, adjusts its virtual inertia time constant from T1 to a larger T2, and uses ΔP as an internal feedforward command buffer. At this time, the PCS output power remains unchanged, but the dynamic characteristics have changed.

[0051] Step S105: Parallel monitoring of the status of the main circuit breaker for high-power loads.

[0052] Step S106: Determine if the main circuit breaker is closed. Once a closing signal is detected, proceed immediately to step S207.

[0053] Step S107: The main control device 105 sends a second control command (or only a trigger signal).

[0054] Step S108: PCS106 immediately releases the buffered power feedforward command ΔP and, combined with real-time voltage / frequency closed-loop regulation, outputs supporting power in a very short time (<10ms). Because the parameters have been pre-optimized, its dynamic response is smoother.

[0055] Step S109: After the load start-up process is completed, the auxiliary equipment power is monitored to drop to zero or the contactor is disconnected.

[0056] Step S110: The master control device 105 sends a recovery command, PCS106 restores the droop coefficient and inertia constant to K1 and T1, clears the feedforward command, and waits for the next task.

[0057] The method of this invention includes: real-time monitoring of the operating status of auxiliary equipment for high-power loads; determining whether the auxiliary equipment has entered the preparation stage for startup based on signals such as contactor closure and power reaching a threshold; immediately notifying the energy storage master controller to adjust parameters such as droop coefficient and inertia constant in advance and preset power output commands, entering a rapid response preparation state; when the main circuit of the high-power load is detected to have actually started, the PCS immediately outputs supporting power based on the preset commands. This invention, by capturing the "precursor signals" of load startup, transforms the energy storage response from passive feedback to proactive feedforward, greatly shortening the power response time, effectively suppressing voltage dips and frequency fluctuations in the energy storage system, and improving the system's adaptability to impulsive loads.

[0058] The above embodiments are only used to illustrate the technical concept of the present invention and are not intended to limit the scope of protection of the present invention. Various modifications and improvements made by those skilled in the art to the system architecture, communication methods, judgment thresholds, adjustment parameters, etc., without departing from the spirit and essence of the present invention, should all fall within the scope of protection of the present invention.

Claims

1. A method for optimizing the power response of an energy storage system under high-power load fluctuations, characterized in that, Applied to an energy storage power station including a converter, the method includes: Real-time monitoring of the operating status signal of at least one auxiliary device associated with a high-power load; based on the operating status signal, determining whether the auxiliary device has entered the preparation start-up phase; When it is determined that the auxiliary equipment has entered the preparation start-up stage, a first early warning control command is generated and sent to the converter. The converter responds to the first early warning control command and performs a first parameter preset operation. The first parameter preset operation includes: preset power output increment according to the predicted impact power of the high-power load, and adjust control parameters to enter a fast response preparation state. The system monitors at least one main circuit start signal associated with the high-power load in real time. When the main circuit start signal is detected, a second control command is generated and sent to the converter. The converter responds to the second control command and outputs supporting power to cope with the start-up impact of the high-power load based on the preset power output increment and control parameters in the first parameter preset operation.

2. The power response optimization method for energy storage systems under high-power load fluctuations according to claim 1, characterized in that, The operating status signal includes at least one of the following: the opening and closing status signal of the auxiliary equipment power circuit contactor and / or the operating status output signal of the auxiliary equipment frequency converter, as well as the active power value or current value of the auxiliary equipment. Determining whether the auxiliary equipment has entered the preparation for startup stage specifically includes: when the contactor of the auxiliary equipment power circuit is detected to be closed and / or the inverter of the auxiliary equipment is detected to be running, and the active power value or current value of the auxiliary equipment is detected to reach a preset threshold, then the auxiliary equipment is determined to have entered the preparation for startup stage.

3. The power response optimization method for an energy storage system under high-power load fluctuations according to claim 1, characterized in that, The main circuit start signal includes at least one of the following: the opening and closing status signal of the main circuit contactor and / or the operating status output signal of the main circuit frequency converter, as well as the active power value or current value consumed by the high-power load equipment.

4. The power response optimization method for an energy storage system under high-power load fluctuations according to claim 1, characterized in that, The first early warning control command and the second control command are sent from the main control equipment of the energy storage power station to the converter via a wired industrial Ethernet or wireless LoRa communication network.

5. The power response optimization method for an energy storage system under high-power load fluctuations according to claim 1, characterized in that, The adjustment of control parameters to enter the fast response preparation state specifically includes: reducing the virtual droop coefficient of the converter, and / or increasing the virtual inertia time constant of the converter.

6. The power response optimization method for an energy storage system under high-power load fluctuations according to claim 1, characterized in that, The method further includes: after the high-power load is started, monitoring the working status signal of the auxiliary equipment; when it is determined based on the working status signal that the auxiliary equipment has been turned off, generating and sending a recovery command to the converter; the converter responds to the recovery command and restores the control parameters to the initial values ​​before the first parameter preset operation was executed.

7. A power response optimization system for an energy storage system under high-power load fluctuations, used to implement the method according to any one of claims 1-6, characterized in that, The system includes: A status monitoring module is configured to monitor in real time the operating status signal of at least one auxiliary device associated with a high-power load, and at least one main circuit start signal associated with the high-power load. The early warning judgment module is configured to determine whether the auxiliary equipment has entered the preparation start-up stage based on the working status signal of the auxiliary equipment. The main control device is communicatively connected to the status monitoring module and is configured to generate a first early warning control command based on the judgment result and a second control command based on the main circuit start signal. The converter is communicatively connected to the main control device and is configured to perform a first parameter preset operation in response to the first early warning control command and to output supporting power in response to the second control command.

8. The power response optimization system for an energy storage system under high-power load fluctuations according to claim 7, characterized in that, The status monitoring module includes a digital input unit for acquiring contactor signals of auxiliary equipment, an interface unit for acquiring inverter status signals of auxiliary equipment, an analog input unit or power transmitter for acquiring power or current values ​​of auxiliary equipment, a digital input unit for acquiring contactor signals of the main circuit, an interface unit for acquiring inverter status signals of the main circuit, and an analog input unit or power transmitter for acquiring power or current values ​​of the main circuit. The main control device communicates with the converter via an industrial Ethernet switch or a LoRa gateway.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by a processor, it implements the method as described in any one of claims 1-6.

10. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, it implements the method as described in any one of claims 1-6.

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