Method for realizing fast power response and new energy power station

Abstract

The application discloses a method and a new energy power station for realizing fast power response, solves the problems of poor economy and low reliability of dynamic reactive power compensation resources meeting 30ms dynamic reactive power compensation response time in the prior art, and the method is applied to a plant station end power control device in the new energy power station and comprises the following steps: determining a total station reactive power target value and / or a total station active power target value of the power station; determining second power control instructions readable by each photovoltaic inverter or energy storage converter in the power station based on the total station reactive power target value and / or the total station active power target value; and delivering the second power control instructions to each photovoltaic inverter or energy storage converter indicated by address identification information carried in the second power control instructions through an Ethernet network and / or a field bus network to each subarray controller or subarray communication equipment, so that each photovoltaic inverter or energy storage converter performs fast power response based on the second power control instructions.

Description

Technical Field

[0001] This application relates to the field of new energy power generation control, and in particular to a method for achieving fast power response and a new energy power plant. Background Technology

[0002] Photovoltaic inverters in photovoltaic power plants or energy storage converters in energy storage power plants can output both active power to maintain grid frequency stability and reactive power to maintain grid voltage stability. For example, when voltage disturbances occur in the grid, photovoltaic power plants or energy storage power plants can quickly coordinate and control reactive power to participate in grid voltage regulation, playing a significant role in the safe and stable operation of the grid.

[0003] Currently, reactive power is often coordinated and controlled quickly through reactive power compensation devices. Considering that the national standard requires that the dynamic reactive power compensation response time of the reactive power compensation device should not exceed 30 milliseconds, only static var generators (SVG) can meet the relevant requirements well. Therefore, many power grids in my country have listed SVG as an essential device for grid connection of new energy sources and have mandated that each power station be equipped with it.

[0004] However, SVG has problems such as high initial investment cost, high power consumption and high operation and maintenance costs. Therefore, finding a dynamic reactive power compensation resource that can meet the national standard of 30 milliseconds dynamic reactive power compensation response time, is economical and reliable has become an important development direction for the industry. Summary of the Invention

[0005] This application provides a method for achieving fast power response and a new energy power plant, in order to solve the problems of poor economic efficiency and low reliability of dynamic reactive power compensation resources that meet the national standard of 30 milliseconds dynamic reactive power compensation response time in the prior art.

[0006] In a first aspect, embodiments of this application provide a method for achieving fast power response, applied to a power control device at the plant end of a new energy power plant. The power plant includes at least two subarrays, each subarray including a power control command processing and forwarding device and at least three power control command execution devices. The method includes:

[0007] Based on the first power control command issued by the superior system or the voltage and current analog signals of the grid connection point of the power station at the current moment, determine the target value of reactive power and / or the target value of active power of the power station.

[0008] Based on the total reactive power target value and / or the total active power target value of the entire station, a second power control instruction readable by each power control instruction execution device in each subarray of the power station is determined; wherein, the second power control instruction is used to indicate the power target value of each power control instruction execution device when the total reactive power target value and / or the total active power target value of the entire station is reached;

[0009] The second power control command is transmitted to each power control command execution device through the power control command processing and forwarding device in each subarray of the power plant, so that each power control command execution device can perform a power response based on the second power control command.

[0010] Based on the above technical solution, fast communication between the power control device at the plant end and the target power control command execution device is realized. Compared with TCP communication between the power control device at the plant end and the target power control command execution device, which requires at least 10 milliseconds for encoding and decoding between the two communication points and the entire transmission process, the power control command processing and forwarding device needs to go through two handshakes, which takes 20 milliseconds. In this embodiment, the power control device at the plant end directly reaches the target power control command execution device. That is, the power control command processing and forwarding device only realizes network pass-through without handshake, which only takes 10 milliseconds. This retains the technical feasibility of achieving a 30-millisecond reactive power response based on the power control command execution device.

[0011] In one possible design, based on the first power control command issued by the superior system or the collected analog voltage signal at the grid connection point of the power station at the current moment, the target value of the total reactive power of the power station is determined, including:

[0012] If the first power control command issued by the superior system includes a target value for the reactive power of the entire station, then the target value for the reactive power of the entire power station is determined based on the first power control command; or,

[0013] The analog voltage signal at the grid connection point of the power station at the current moment is collected, and the analog voltage signal at the current moment of the grid connection point is processed based on the voltage instantaneous amplitude calculation algorithm to determine the voltage instantaneous amplitude at the current moment of the grid connection point.

[0014] Based on the instantaneous voltage amplitude at the current grid connection point, the target value of reactive power for the entire power station is determined.

[0015] Based on the above technical solution, rapid acquisition and calculation of the instantaneous voltage amplitude at the grid connection point of the power plant is achieved. Taking 2-3 sampling points as an example, based on the analog voltage signal at the grid connection point of the power plant collected by the power control device at the plant end, the analog voltage signal at the grid connection point of the power plant is processed based on the instantaneous voltage amplitude calculation algorithm to determine the instantaneous voltage amplitude at the grid connection point of the power plant, which only takes 2-3 milliseconds. Compared with the conventional method of determining the instantaneous voltage amplitude at the grid connection point of the power plant based on a third-party electricity meter, which takes at least 20 milliseconds to calculate the voltage amplitude and then transmits it via serial port, this method is much more efficient. The transmission of the result to the power control device at the power plant end takes 500 milliseconds or even longer. Alternatively, the power control device 100 at the power plant end may only collect the analog voltage signal at the current moment of the power plant's grid connection point. However, processing the analog voltage signal at the current moment of the power plant's grid connection point based on the conventional Fourier calculation algorithm to determine the instantaneous voltage amplitude at the current moment of the power plant's grid connection point usually takes one cycle, i.e., 20 milliseconds. The embodiment of this application only takes 2 to 3 milliseconds, leaving about 27 milliseconds of space for subsequent links, thus preserving the technical feasibility of achieving a 30-millisecond reactive power response based on the power control command execution device.

[0016] In one possible design, based on the first power control command issued by the superior system or the collected analog voltage and current signals at the grid connection point of the power station at the current moment, the target value of the total active power of the power station is determined, including:

[0017] If the first power control command issued by the superior system includes a target value for the total active power of the entire station, then the target value for the total active power of the power station is determined based on the first power control command; or,

[0018] The analog voltage and current signals at the grid connection point of the power station at the current moment are collected. The analog voltage and current signals at the grid connection point at the current moment are processed based on the instantaneous amplitude calculation algorithm to determine the instantaneous active power and instantaneous voltage amplitude at the grid connection point at the current moment. Based on the instantaneous voltage amplitude, the frequency value is determined.

[0019] Based on the instantaneous active power at the current moment and the frequency value, the target value of the total active power of the power station is determined.

[0020] In one possible design, the power target values ​​of each power control command execution device are the absolute value of the power target, the proportional value of the power target, the absolute value of the change, or the proportional value of the change. The proportional value of the power target is the ratio between the absolute value of the power target and the rated power of the power control command execution device. The absolute value of the change is the absolute difference between the absolute value of the power target and the power of the power control command execution device at the current moment. The proportional value of the change is the ratio between the absolute value of the change and the rated power of the power control command execution device.

[0021] In one possible design, the second power control instruction carries address identification information of each power control instruction execution device. The address identification information includes any one or more combinations of Internet Protocol (IP) address, unicast Media Access Control (MAC) address, multicast or broadcast MAC address, and a string corresponding to the target power control instruction execution device.

[0022] In one possible design, the second power control command is transmitted to each power control command execution device through a power control command processing and forwarding device in each subarray of the power plant, including:

[0023] The second power control command is sent to the power control command processing and forwarding devices in each subarray of the power plant, so that the power control command processing and forwarding devices can directly send the second power control command to the target power control command execution device in the subarray corresponding to the power control command processing and forwarding device through the communication network chip; wherein, the target power control command execution device is the power control command execution device indicated by the address identification information carried in the second power control command.

[0024] In one possible design, the power control command processing and forwarding device includes a subarray controller or a subarray communication device;

[0025] The subarray controller is a device installed in the subarray and paired with the step-up transformer in the subarray. The subarray controller is any one or more of the following: subarray data acquisition device, multi-in-one intelligent transformer substation measurement and control device, communication management device, or protocol conversion device.

[0026] The subarray communication device is any one or more of the following: network switch, gateway, fiber optic repeater, bus repeater, or bus expansion device.

[0027] The power control command execution device includes a photovoltaic inverter or an energy storage converter.

[0028] In one possible design, the power control device at the plant end communicates with each power control command execution device via Ethernet network and / or fieldbus network.

[0029] The Ethernet network communication is either GOOSE communication for general-purpose substation events or UDP communication.

[0030] The fieldbus network communication can be any one of Controller Area Network (CAN) communication, Ethernet control automation technology (EtherCat) communication, or open-source real-time communication technology (Ethernet Powerlink).

[0031] Based on the above technical solution, rapid communication between the power control device at the plant end and the target power control command execution device is realized. In this embodiment, the power control device at the plant end directly communicates with the target power control command execution device. That is, the power control command processing and forwarding device only realizes network pass-through without handshaking. Furthermore, the power control device at the plant end and the target power control command execution device communicate via GOOSE, UDP, or fieldbus network to minimize network packet assembly and depacketization time, improve timeliness, and achieve rapid communication between the power control device at the plant end and the target power control command execution device within 5 milliseconds. This preserves the technical feasibility of achieving a 30-millisecond reactive power response based on the power control command execution device.

[0032] In one possible design, before determining the target values ​​for the total reactive power and / or the total active power of the power station, the following steps are also included:

[0033] The analog voltage signal at the grid connection point of the power station at the current moment is collected. The analog voltage signal at the current moment of the grid connection point is processed based on the voltage instantaneous amplitude calculation algorithm to determine the voltage instantaneous amplitude at the current moment of the grid connection point. Based on the voltage instantaneous amplitude, the frequency value is determined.

[0034] Based on the instantaneous voltage amplitude and frequency value at the current moment of the grid connection point, determine the total reactive power and / or total active power of the power station at the current moment.

[0035] Determine whether the total reactive power and / or total active power of the power station at the current moment are outside the preset range.

[0036] Secondly, this application also provides a new energy power plant, including a power control device at the plant end and at least two subarrays, wherein the subarrays include a power control command processing and forwarding device and at least three power control command execution devices;

[0037] The power control device at the power plant end is used to determine the target value of reactive power and / or the target value of active power of the power plant based on the first power control command issued by the upper-level system or the voltage and current analog signals of the grid connection point of the power plant at the current moment.

[0038] The power control device at the power plant end is further configured to determine, based on the total reactive power target value and / or the total active power target value, a second power control instruction readable by each power control instruction execution device in each subarray of the power plant, and to issue the second power control instruction to the power control instruction processing and forwarding device in each subarray of the power plant; wherein, the second power control instruction is used to indicate the power target value of each power control instruction execution device when the total reactive power target value and / or the total active power target value of the power plant is reached;

[0039] The power control command processing and forwarding device in each subarray of the power plant is used to pass the second power control command through to each power control command execution device.

[0040] Each power control command execution device is used to perform a power response based on the second power control command.

[0041] In one possible design, when the power control device at the power plant end determines the target value of the total reactive power of the power plant based on the first power control command issued by the upper-level system or the collected analog voltage signal at the grid connection point of the power plant, it is specifically used for:

[0042] If the first power control command issued by the superior system includes a target value for the reactive power of the entire station, then the target value for the reactive power of the entire power station is determined based on the first power control command; or,

[0043] The analog voltage signal at the grid connection point of the power station at the current moment is collected, and the analog voltage signal at the current moment of the grid connection point is processed based on the voltage instantaneous amplitude calculation algorithm to determine the voltage instantaneous amplitude at the current moment of the grid connection point.

[0044] Based on the instantaneous voltage amplitude at the current grid connection point, the target value of reactive power for the entire power station is determined.

[0045] In one possible design, when the power control device at the power plant end determines the target value of the total active power of the power plant based on the first power control command issued by the upper-level system or the collected analog voltage and current signals at the grid connection point of the power plant, it is specifically used for:

[0046] If the first power control command issued by the superior system includes a target value for the total active power of the entire station, then the target value for the total active power of the power station is determined based on the first power control command; or,

[0047] The analog voltage and current signals at the grid connection point of the power station at the current moment are collected. The analog voltage and current signals at the grid connection point at the current moment are processed based on the instantaneous amplitude calculation algorithm to determine the instantaneous active power and instantaneous voltage amplitude at the grid connection point at the current moment. Based on the instantaneous voltage amplitude, the frequency value is determined.

[0048] Based on the instantaneous active power at the current moment and the frequency value, the target value of the total active power of the power station is determined.

[0049] In one possible design, the power target values ​​of each power control command execution device are the absolute value of the power target, the proportional value of the power target, the absolute value of the change, or the proportional value of the change. The proportional value of the power target is the ratio between the absolute value of the power target and the rated power of the power control command execution device. The absolute value of the change is the absolute difference between the absolute value of the power target and the power of the power control command execution device at the current moment. The proportional value of the change is the ratio between the absolute value of the change and the rated power of the power control command execution device.

[0050] In one possible design, the second power control instruction carries address identification information of each power control instruction execution device. The address identification information includes any one or more combinations of Internet Protocol (IP) address, unicast Media Access Control (MAC) address, multicast or broadcast MAC address, and a string corresponding to the target power control instruction execution device.

[0051] In one possible design, when the power control command processing and forwarding device in each subarray of the power plant transparently transmits the second power control command to each power control command execution device, it is specifically used for:

[0052] The power control command processing and forwarding device in each subarray of the power plant directly sends the second power control command to the target power control command execution device in the subarray corresponding to the power control command processing and forwarding device through the communication network chip; wherein, the target power control command execution device is the power control command execution device indicated by the address identification information carried in the second power control command.

[0053] In one possible design, the power control command processing and forwarding device includes a subarray controller or a subarray communication device;

[0054] The subarray controller is a device installed in the subarray and paired with the step-up transformer in the subarray. The subarray controller includes any one or more of the following: subarray data acquisition device, multi-in-one intelligent transformer substation measurement and control device, communication management device, or protocol conversion device.

[0055] The subarray communication device is any one or more of the following: network switch, gateway, fiber optic repeater, bus repeater, or bus expansion device.

[0056] The power control command execution device includes a photovoltaic inverter or an energy storage converter.

[0057] In one possible design, the power control device at the plant end communicates with each power control command execution device via Ethernet network and / or fieldbus network.

[0058] The Ethernet network communication is either GOOSE communication for general-purpose substation events or UDP communication.

[0059] The fieldbus network communication can be any one of Controller Area Network (CAN) communication, Ethernet control automation technology (EtherCat) communication, or open-source real-time communication technology (Ethernet Powerlink).

[0060] In one possible design, the power control device at the plant end is also used for:

[0061] The analog voltage signal at the grid connection point of the power station at the current moment is collected. The analog voltage signal at the current moment of the grid connection point is processed based on the voltage instantaneous amplitude calculation algorithm to determine the voltage instantaneous amplitude at the current moment of the grid connection point. Based on the voltage instantaneous amplitude, the frequency value is determined.

[0062] Based on the instantaneous voltage amplitude and frequency value at the current moment of the grid connection point, determine the total reactive power and / or total active power of the power station at the current moment.

[0063] Determine whether the total reactive power and / or total active power of the power station at the current moment are outside the preset range.

[0064] Thirdly, this application also provides an apparatus for achieving fast power response, applied to a power control device at the plant end in a new energy power plant. The power plant includes at least two subarrays, each subarray including a power control instruction processing and forwarding device and at least three power control instruction execution devices. The apparatus for achieving fast power response may include: at least one processor; and a memory and a communication interface communicatively connected to the at least one processor. The memory stores instructions executable by the at least one processor, and the at least one processor performs the functions described in the first aspect or any possible design method of the first aspect by executing the instructions stored in the memory.

[0065] Fourthly, this application also provides a computer storage medium including computer instructions that, when executed on a computer, cause the computer to perform the methods described in the first aspect or any possible design of the first aspect.

[0066] Fifthly, this application also provides a computer program product that, when run on a computer, causes the computer to perform the methods described in the first aspect or any possible design of the first aspect. Attached Figure Description

[0067] Figure 1 This application provides a schematic diagram of the structure of a system for achieving fast power response in a power plant, as illustrated in an embodiment of the present application.

[0068] Figure 2 A schematic diagram of another system for achieving fast power response in a power plant, provided in an embodiment of this application;

[0069] Figure 3 This is a schematic diagram of the structure of another system for realizing fast power response in a power plant, provided in an embodiment of this application.

[0070] Figure 4 This application provides a schematic diagram of the structure of a new energy power station.

[0071] Figure 5 A flowchart illustrating a method for achieving fast power response provided in an embodiment of this application;

[0072] Figure 6a A schematic diagram illustrating how a power control device at a power plant end transmits power control commands to various photovoltaic inverters or energy storage converters, as provided in an embodiment of this application.

[0073] Figure 6b A schematic diagram showing another power control device for power plants provided in this application, which transmits power control commands to each photovoltaic inverter or energy storage converter.

[0074] Figure 6c A schematic diagram illustrating how a power control device at the plant end transmits power control commands to each photovoltaic inverter or energy storage converter, as provided in an embodiment of this application.

[0075] Figure 7 This is a schematic diagram of another new energy power station provided in an embodiment of this application;

[0076] Figure 8 This is a schematic diagram of a device for achieving fast power response, provided in an embodiment of this application. Detailed Implementation

[0077] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings.

[0078] To facilitate understanding of the embodiments of this application, the technical terms involved in the embodiments of this application will be explained below.

[0079] I. Active power and reactive power

[0080] The power output of the power grid consists of two parts: active power and reactive power. Active power directly consumes electrical energy and converts it into mechanical, thermal, chemical, or acoustic energy. This energy is used to do work. Reactive power does not consume electrical energy but converts it into another form of energy. This energy is a necessary condition for electrical equipment to do work, and it can be periodically converted with electrical energy in the power grid. This energy is used to do work. Examples of reactive power include the electrical energy used by electromagnetic components to establish a magnetic field and the electrical energy used by capacitor components to establish an electric field.

[0081] II. Reactive Power Compensation

[0082] Reactive power compensation, or reactive power adjustment for short, is a technology used in power supply systems to improve the power factor of the power grid, reduce losses in power transformers and transmission lines, increase power supply efficiency, and improve the power supply environment. Therefore, reactive power compensation devices occupy an indispensable and crucial position in power supply systems. Proper selection of reactive power compensation devices can reduce grid losses and improve grid quality; conversely, improper selection or use of reactive power compensation devices may cause voltage fluctuations in the power supply system, increase grid losses, and reduce grid quality.

[0083] Currently, reactive power compensation devices mainly include the following types: static var generators (SVG), static var compensators (SVC), magnetically controlled reactors (MCR), thyristor-controlled reactors (TCR), and thyristor-switched capacitors (TSC). Considering that national standards require the dynamic reactive power compensation response time of these devices to be no greater than 30 milliseconds, among the aforementioned devices, only SVG can adequately meet this requirement. Therefore, many regional power grids in my country have designated SVG as an essential device for new energy grid connection, mandating its installation in all power plants.

[0084] III. Static Var Generator (SVG)

[0085] SVG, also known as a high-voltage dynamic reactive power compensation generator or static synchronous compensator, refers to a device that uses a freely commutated power semiconductor bridge converter for dynamic reactive power compensation. SVG is currently the best solution in the field of reactive power control. For example, domestic reactive power compensation devices basically use capacitors for reactive power compensation, with a power factor after compensation generally around 0.8-0.9. Furthermore, the fastest domestic reactive power compensation device to complete one compensation cycle takes at least 200 milliseconds. In contrast, SVG uses power modules for reactive power compensation, with a power factor after compensation generally above 0.98, and SVG can complete one compensation cycle in 5-20 milliseconds.

[0086] Since photovoltaic inverters and energy storage converters, which are also insulated gate bipolar transistor (IGBT) devices like SVG, also have the function of outputting inductive and capacitive reactive power, the reactive power response of the power station can be entirely undertaken by SVG, or jointly undertaken by SVG and photovoltaic inverter or energy storage converter, when the dynamic reactive power compensation response time of the reactive power compensation device does not need to be greater than 30 milliseconds.

[0087] For example, such as Figure 1The diagram shown is a structural schematic of a system for realizing rapid power response in a power plant according to an embodiment of this application. The system includes a dispatching master station, a motion device, a power control device at the plant end, a station-level switch, an SVG, a ring network switch, and multiple subarrays. The system comprises several subsystems: a dispatch master station (SCH), a higher-level system for the power plant, and a remote monitoring station. The SCH receives, analyzes, and processes information transmitted from remote control units (RTUs). RTUs, located at the power plant level, receive power control commands from the SCH and control equipment operation. They also transmit analyzed and processed information from the power plant level to the SCH. A plant-level power control unit (SCU) receives power control commands from the SCH or generates its own locally, and transmits these commands to the subarrays, enabling the photovoltaic inverters within the subarrays to respond to power based on the commands. An SVG (Static Var Generator) is located at the power plant level and responds to reactive power under the control of a moving device or the plant-level power control unit. Station-level switches and ring network switches provide electrical signal paths between any two network nodes connected to the switch, such as between the moving device and the SVG, between the plant-level power control unit and the SVG, and between the plant-level power control unit and the subarray. The reactive power response of the power station in this system is entirely handled by the SVG. The photovoltaic inverters in the sub-arrays of the power station only undertake the active power response function and do not participate in reactive power regulation. In this case, although the SVG can meet the requirement that the dynamic reactive power compensation response time of the reactive power compensation device is no more than 30 milliseconds, the SVG has problems such as high initial construction investment cost, high power consumption and high operation and maintenance costs.

[0088] For example, such as Figure 2The diagram shown is a structural schematic of another system for realizing rapid power response in a power plant, provided in an embodiment of this application. The system includes a dispatch master station, a motion device, a power control device at the plant end, a station-level switch, an SVG, a ring network switch, and multiple subarrays. The system comprises several subsystems: a dispatch master station (SCH), a higher-level system for the power plant, and a remote monitoring station. The SCH receives, analyzes, and processes information transmitted from remote control units (RTUs). RTUs, located at the power plant level, receive power control commands from the SCH and control equipment operation. They also transmit analyzed and processed information from the power plant level to the SCH. A plant-level power control unit (SCU) receives power control commands from the SCH or generates its own locally, and transmits these commands to the subarrays, enabling the photovoltaic inverters within the subarrays to respond based on the commands. An SVG (Static Var Generator) is located at the power plant level and responds to reactive power under the control of a moving device or the plant-level power control unit. Station-level switches and ring network switches provide electrical signal paths between any two network nodes connected to the switch, such as between a moving device and an SVG, a moving device and a subarray, a plant-level power control unit and an SVG, and a plant-level power control unit and a subarray. The reactive power response of the power station in this system is jointly undertaken by the SVG and the photovoltaic inverter. Specifically, when a voltage disturbance occurs in the power grid, the power station first uses the SVG to perform rapid reactive power coordination control and participate in grid voltage regulation. After the reactive power response of the power station stabilizes, the power station then dispatches the reactive power of the photovoltaic inverter or energy storage converter to slowly replace the reactive power of the SVG in a time cycle of several seconds or even tens of seconds, so that the SVG maintains a certain reactive power capacity to meet the needs of the next rapid reactive power response. In this case, although the SVG can meet the requirement that the dynamic reactive power compensation response time of the reactive power compensation device is no more than 30 milliseconds, the SVG has problems such as high initial construction investment cost, high power consumption, and high operation and maintenance costs. Furthermore, since photovoltaic inverters or energy storage converters usually communicate based on serial ports, and a small number of centralized photovoltaic inverters or energy storage converters communicate based on network ports, the time taken from the power station issuing a reactive power dispatch command to the photovoltaic inverter or energy storage converter completing the response execution may be several seconds to tens of seconds or even longer.

[0089] For example, such as Figure 3The diagram shown is a structural schematic of another system for realizing rapid power response in a power plant, provided in an embodiment of this application. The system includes a dispatching master station, a motion device, a power control device at the plant end, an electricity meter, a station-level switch, a ring network switch, and multiple subarrays. The system comprises several subsystems: a dispatch master station (the higher-level system of the power plant), a dispatch master station (the station-level system), a dispatch master station (the station-level system), a dispatch master station (the station-level system), a dispatch master station (the station-level system), a dispatch master station (the station-level system), a dispatch master station (the station-level system), a dispatch master station (the station-level system), a dispatch master station (the station-level system), a power control device (the substation ... and a power control device (the substation-level system). The reactive power response of the power plant in this system is entirely handled by the photovoltaic inverters or energy storage converters. Specifically, when a voltage disturbance occurs in the grid, the power control device at the plant end can receive a power control command from the upper-level system containing the target reactive power value for the entire plant. Alternatively, it can calculate the target reactive power value for the entire plant based on the voltage at the grid connection point collected by the electricity meter, decompose the target reactive power value for the entire plant into the target reactive power values ​​for each subarray, and transmit the data via Transmission Control Protocol (TCP) or Internet Protocol (IP). The IP protocol sends power control commands containing the reactive power target values ​​of each subarray to the data acquisition devices of each subarray. The data acquisition devices of each subarray then decompose the reactive power target values ​​of each subarray into reactive power target values ​​of each photovoltaic inverter or energy storage converter, so that each photovoltaic inverter or energy storage converter outputs the corresponding reactive power to participate in grid voltage regulation. In this case, photovoltaic inverters or energy storage converters usually communicate based on serial ports, while a small number of centralized photovoltaic inverters or energy storage converters communicate based on Ethernet ports. As a result, the time taken from the power station issuing the reactive power dispatch command to the photovoltaic inverter or energy storage converter responding and completing the execution may be several seconds to tens of seconds or even longer.

[0090] Therefore, current methods for rapid reactive power coordination and control using SVG (Static Var Generator) suffer from high initial investment costs, high power consumption, and high operation and maintenance expenses. Furthermore, current communication and control technologies for rapid reactive power coordination and control via photovoltaic inverters or energy storage converters cannot meet the requirement that the dynamic reactive power compensation response time of the reactive power compensation device should not exceed 30 milliseconds. Therefore, finding a dynamic reactive power compensation resource that meets the national standard's 30-millisecond dynamic reactive power compensation response time, is economical, and highly reliable has become an important development direction for the industry.

[0091] Therefore, the method for achieving fast power response provided in this application not only meets the requirement in the national standard that the dynamic reactive power compensation response time of the reactive power compensation device should not exceed 30 milliseconds, but also has good economic efficiency and high reliability.

[0092] It should be understood that the embodiments of this application can be applied to a new energy power station, which can be a photovoltaic power station, an energy storage power station, a photovoltaic-energy storage power station, or a hybrid power station including other new energy methods (such as wind power). The embodiments of this application do not specifically limit this. For ease of explanation, the embodiments of this application take a photovoltaic power station or an energy storage power station as an example. The new energy power station includes a power control device at the plant end and at least two subarrays. Each subarray includes a subarray controller, a subarray communication device, and at least three photovoltaic inverters or energy storage converters. The power control device at the plant end is used to issue power control commands to the photovoltaic inverters or energy storage converters so that the photovoltaic inverters or energy storage converters can respond to power based on the power control commands (i.e., implement the method of the embodiments of this application).

[0093] The power control device at the plant end can be a power plant controller (PPC), a power generator controller (PGC), a new energy frequency regulation or voltage regulation device, an automatic generation control (AGC) or automatic voltage control (AVC) system, a supervisory control and data acquisition (SCADA) system, or other systems that can coordinate and control the power of the entire plant. This application does not specifically limit this.

[0094] The subarray communication device in each subarray is a subarray device with only communication function. The subarray communication device can be any one or more of the following: network switch, gateway, fiber optic repeater, bus repeater, or bus expansion device. This application embodiment does not make specific limitations on this. The subarray controller is a subarray device with communication and control functions that is matched with the step-up transformer in the subarray. The subarray controller can be any one or more of the following: subarray data acquisition device, multi-in-one intelligent transformer substation measurement and control device, communication management device, or protocol conversion device. This application embodiment does not make specific limitations on this.

[0095] The photovoltaic inverter or energy storage converter can be a string photovoltaic inverter or energy storage converter, or a centralized photovoltaic inverter or energy storage converter, or a distributed photovoltaic inverter or energy storage converter, or a bidirectional photovoltaic inverter or energy storage converter. This application does not specifically limit this type of inverter or energy storage converter.

[0096] For example, such as Figure 4 The diagram shown is a structural schematic of a new energy power station according to an embodiment of this application. The new energy power station includes a power control device 100 at the plant end, and may also include multiple subarrays. Each subarray includes a subarray controller, a subarray communication device, and at least three photovoltaic inverters or energy storage converters. Figure 4 Three subarrays are illustrated in the example: subarray 200, subarray 300, and subarray 400. Subarray 200 includes a subarray controller 201, a subarray communication device 202, a photovoltaic inverter or energy storage converter 203, a photovoltaic inverter or energy storage converter 204, and a photovoltaic inverter or energy storage converter 205. Figure 4 The dashed line indicates that the subarray communication device 202 is optional for subarray 200. Subarray 300 includes a subarray controller 301, a subarray communication device 302, a photovoltaic inverter or energy storage converter 303, a photovoltaic inverter or energy storage converter 304, and a photovoltaic inverter or energy storage converter 305, wherein... Figure 4 The dashed line indicates that the subarray communication device 302 is optional for subarray 300. Subarray 400 includes a subarray controller 401, a subarray communication device 402, a photovoltaic inverter or energy storage converter 403, a photovoltaic inverter or energy storage converter 404, and a photovoltaic inverter or energy storage converter 405, wherein... Figure 4 The dashed line indicates that subarray communication device 402 is optional for subarray 400. In such cases... Figure 4In the new energy power plant architecture shown, only the photovoltaic inverter or energy storage converter 203, photovoltaic inverter or energy storage converter 204, photovoltaic inverter or energy storage converter 205, photovoltaic inverter or energy storage converter 303, photovoltaic inverter or energy storage converter 304, photovoltaic inverter or energy storage converter 305, photovoltaic inverter or energy storage converter 403, photovoltaic inverter or energy storage converter 404, and photovoltaic inverter or energy storage converter 405 are string photovoltaic inverters or energy storage converters as examples. The embodiments of this application do not limit the specific form of the photovoltaic inverters or energy storage converters included in the new energy power plant.

[0097] The above describes the new energy power plant provided by the embodiments of this application. Next, with reference to the accompanying drawings, we will describe the method for achieving fast power response provided by the embodiments of this application.

[0098] It should be understood that the terms "first" and "second" in the embodiments of this application 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. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature. "At least one" means one or more, and "more" means two or more. "And / or" describes the relationship between related objects, indicating that three relationships may exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone, where A and B can be singular or plural. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. "At least one of the following" or similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one of a, b, or c can represent: a, b, c, a and b, a and c, b and c, or a and b and c.

[0099] like Figure 5 The diagram shown is a flowchart illustrating a method for achieving fast power response according to an embodiment of this application. This method for achieving fast power response can be applied to the above-mentioned... Figure 4 The shown or the Figure 4 A new energy power plant with a similar functional structure. The specific process of this method to achieve fast power response is described below.

[0100] S501. Based on the first power control command issued by the superior system or the collected analog voltage and current signals at the grid connection point of the power station at the current moment, determine the target value of the total reactive power and / or the target value of the total active power of the power station.

[0101] In some embodiments, the power control device 100 at the power plant end can determine the target value of reactive power and / or the target value of active power of the entire power plant based on the first power control command after receiving the first power control command issued by the upper-level system.

[0102] For example, if the first power control instruction issued by the superior system to the power control device 100 at the plant includes a target value for reactive power of the entire plant, then the target value for reactive power of the entire plant is determined based on the first power control instruction; if the first power control instruction issued by the superior system to the power control device 100 at the plant includes a target value for active power of the entire plant, then the target value for active power of the entire plant is determined based on the first power control instruction; if the first power control instruction issued by the superior system to the power control device 100 at the plant includes both a target value for reactive power and a target value for active power of the entire plant, then the target values ​​for reactive power and active power of the entire plant are determined based on the first power control instruction.

[0103] In other embodiments, the power control device 100 at the power station can also determine the target value of reactive power and / or the target value of active power of the power station based on the analog voltage and current signals at the current moment of the power station's grid connection point after acquiring the analog voltage and current signals at the current moment of the power station's grid connection point through a power transformer (PT) and a current transformer (CT). The sampling frequency of the analog voltage and current signals at the current moment of the power station's grid connection point should be no less than 1200Hz. The number of sampling points can be one or more. This application embodiment does not make a specific limitation on this, but to improve reliability, this application embodiment takes 2 to 3 sampling points as an example.

[0104] For example, after acquiring the analog voltage signal of the power plant's grid connection point at the current moment through a PT, the power plant power control device 100 can first process the analog voltage signal of the power plant's grid connection point at the current moment based on a voltage instantaneous amplitude calculation algorithm to determine the voltage instantaneous amplitude of the power plant's grid connection point at the current moment. The calculation frequency for calculating the voltage instantaneous amplitude of the power plant's grid connection point at the current moment must be no less than 1200Hz. The voltage instantaneous amplitude calculation algorithm can be the αβ transformation method based on a 90° delay of single-phase voltage to construct two-phase voltage, or the dq0 transformation method based on instantaneous reactive power theory. This application embodiment does not specifically limit this. For example, the analog voltage signal of the power plant's grid connection point at the current moment is processed to obtain the three-phase voltage instantaneous amplitude collected at the same time section. The three-phase coordinates are transformed into two-phase coordinates through the αβ transformation method, so that the voltage instantaneous amplitude U of the power plant's grid connection point at the current moment can be directly determined without time integration and accumulation calculation. Then, based on the instantaneous voltage amplitude at the current moment of the power station's grid connection point, the target value of the power station's total reactive power is determined. For example, the target value of the power station's total reactive power Q is determined based on the instantaneous voltage amplitude U at the current moment of the power station's grid connection point using the QU curve or related empirical formulas.

[0105] It should be noted that, in this embodiment of the application, in order to prevent the influence of impact interference, it is necessary to obtain multiple continuous instantaneous voltage amplitude sampling points, such as 2 to 3 consecutive instantaneous voltage amplitude sampling points, calculate the average value of multiple instantaneous voltage amplitude calculation points, remove points among multiple instantaneous voltage amplitude sampling points whose deviation from the average value exceeds a preset range (e.g., 5% to 10%), and determine the weighted average value of the remaining points in a manner that the closer the time is to the current time, the higher the weight coefficient. This weighted average value is used as the instantaneous voltage amplitude of the power station's grid connection point at the current time.

[0106] It should be noted that, in the embodiments of this application, when processing the analog voltage signal at the current moment of the power station's grid connection point based on the voltage instantaneous amplitude calculation algorithm to determine the voltage instantaneous amplitude at the current moment of the power station's grid connection point, the voltage instantaneous amplitude at the current moment of the power station's grid connection point can also be determined simultaneously based on the half-cycle Fourier calculation algorithm and the full-cycle Fourier calculation algorithm. This allows for the output of the voltage instantaneous amplitude at the current moment of the power station's grid connection point determined by different calculation algorithms when voltage changes, thereby reducing the calculation error of the voltage instantaneous amplitude.

[0107] Based on the above technical solution, the instantaneous voltage amplitude at the grid connection point of a power plant is rapidly acquired and calculated. Taking 2-3 sampling points as an example, based on the analog voltage signal at the grid connection point of the power plant automatically collected by the power control device 100 at the plant end, the analog voltage signal at the grid connection point is processed using the instantaneous voltage amplitude calculation algorithm to determine the instantaneous voltage amplitude at the grid connection point of the power plant. This process takes only 2-3 milliseconds. Compared to the conventional method of determining the instantaneous voltage amplitude at the grid connection point of a power plant based on a third-party electricity meter, which requires at least 20 milliseconds for the electricity meter to calculate the voltage amplitude and then transmit the signal via serial port... Transmitting the results to the power control device at the power plant can take 500 milliseconds or even longer. Alternatively, the power control device 100 at the power plant may only collect the analog voltage signal at the current grid connection point of the power plant. However, processing the analog voltage signal at the current grid connection point of the power plant based on the conventional Fourier calculation algorithm to determine the instantaneous voltage amplitude at the current grid connection point of the power plant usually takes one cycle, i.e., 20 milliseconds. The embodiment of this application only takes 2 to 3 milliseconds, leaving about 27 milliseconds of space for subsequent links, thus preserving the technical feasibility of achieving a 30-millisecond reactive power response based on photovoltaic inverters or energy storage converters.

[0108] For example, the power control device 100 at the power plant end can also process the analog voltage and current signals at the current moment of the grid connection point based on the instantaneous amplitude calculation algorithm to determine the instantaneous active power at the current moment of the grid connection point, and determine the target value of the total active power of the power plant based on the instantaneous active power and frequency value at the current moment.

[0109] It should be noted that, in this embodiment, the power control device 100 at the power plant end can also, before determining the target value of the total reactive power and / or the target value of the total active power of the power plant, collect the analog voltage signal at the current moment of the power plant's grid connection point, process the analog voltage signal at the current moment of the grid connection point based on the voltage instantaneous amplitude calculation algorithm, and determine the instantaneous voltage amplitude at the current moment of the grid connection point. Then, based on the instantaneous voltage amplitude and frequency value at the current moment of the grid connection point, the total reactive power and / or the total active power of the power plant at the current moment are determined, and it is determined whether the total reactive power and / or the total active power of the power plant at the current moment are within a preset range. If not, the target value of the total reactive power and / or the target value of the total active power of the power plant are determined.

[0110] S502. Based on the target values ​​of reactive power and / or active power of the entire station, determine the second power control command that can be read by each photovoltaic inverter or energy storage converter in the power station.

[0111] In some embodiments, after the power control device 100 at the power plant end determines the target value of reactive power and / or the target value of active power for the entire power plant, it can determine a second power control command readable by each photovoltaic inverter or energy storage converter in the power plant based on the target value of reactive power and / or the target value of active power for the entire power plant. The second power control command is used to indicate the power target value of each photovoltaic inverter or energy storage converter when the target value of reactive power and / or the target value of active power for the entire power plant is reached. The second power control command carries the address identification information of each photovoltaic inverter or energy storage converter. After the power control device 100 at the power plant end sends the second power control command to the subarray controller or subarray communication device in the power plant, the subarray controller or subarray communication device in the power plant can determine the target photovoltaic inverter or target energy storage converter according to the address identification information carried in the second power control command, and then send the second power control command to the target photovoltaic inverter or target energy storage converter in the subarray corresponding to the subarray controller or subarray communication device.

[0112] It should be noted that, in the embodiments of this application, the power target value of each photovoltaic inverter or energy storage converter can be an absolute power target value, a power target percentage value, an absolute value of change, or a percentage of change. This application does not impose specific limitations on these. The power target percentage value is the ratio between the absolute power target value and the rated power of the photovoltaic inverter or energy storage converter. For example, if the absolute power target value of a photovoltaic inverter is 80 kW and its rated power is 100 kW, then the power target percentage value of the photovoltaic inverter is 80%. The absolute value of change is the absolute difference between the absolute power target value and the current power of the photovoltaic inverter or energy storage converter. For example, if the absolute power target value of a photovoltaic inverter is 80 kW and its current power is 60 kW, then the absolute value of the change in power for the photovoltaic inverter is 20 kW. The percentage change is the ratio between the absolute value of the change and the rated power of the photovoltaic inverter or energy storage converter. For example, if the absolute value of the change for a photovoltaic inverter is 20 kW and the rated power of the photovoltaic inverter is 100 kW, then the percentage change for the photovoltaic inverter is 20%.

[0113] It should be noted that, in the embodiments of this application, the address identification information of each photovoltaic inverter or energy storage converter carried in the second power control command may include any one or more combinations of IP address, unicast media access control address (MAC address), multicast or broadcast MAC address, and string corresponding to the target photovoltaic inverter or target energy storage converter. The embodiments of this application do not impose specific limitations on this.

[0114] For example, after determining the total reactive power target value of the power station, the power control device 100 can distribute the total reactive power target value to each photovoltaic inverter or energy storage converter in the power station in two modes: average distribution or differentiated distribution according to the reactive power output capacity of each photovoltaic inverter or energy storage converter. For example, taking the average distribution of the total reactive power target value to each photovoltaic inverter or energy storage converter in the power station as an example, where the power target value of each photovoltaic inverter or energy storage converter is a proportion of the power target value, to achieve the total reactive power target value of 30MW, assuming the total capacity of the power station is 100MW, and the rated power of each photovoltaic inverter or energy storage converter is 100kW, and there are a total of 1000 photovoltaic inverters or energy storage converters in the power station... Figure 4 The nine photovoltaic inverters or energy storage converters in this system are only a part of the total photovoltaic inverters or energy storage converters in the entire station. Figure 4 If the nine photovoltaic inverters or energy storage converters in the subarray need to achieve a total reactive power target of 270kW, then the power control device 100 at the plant end can determine that the reactive power target values ​​for photovoltaic inverters or energy storage converters 203, 204, and 205 in subarray 200 are all 30%, the reactive power target values ​​for photovoltaic inverters or energy storage converters 303, 304, and 305 in subarray 300 are all 30%, and the reactive power target values ​​for photovoltaic inverters or energy storage converters 403, 404, and 405 in subarray 400 are all 30%. Based on the above allocation results, a second power control command readable by each photovoltaic inverter or energy storage converter in the power station is determined. This second power control command is used to instruct photovoltaic inverters or energy storage converters 203, 204, 205, 303, 304, 305, 403, 404, and 405, as well as photovoltaic inverters or energy storage converters 404 and 405, to perform their respective functions. The reactive power target value of the inverter or energy storage converter 405 is 30%. The second power control command will carry the address identification information of the photovoltaic inverter or energy storage converter 203, photovoltaic inverter or energy storage converter 204, photovoltaic inverter or energy storage converter 205, photovoltaic inverter or energy storage converter 303, photovoltaic inverter or energy storage converter 304, photovoltaic inverter or energy storage converter 305, photovoltaic inverter or energy storage converter 403, photovoltaic inverter or energy storage converter 404, and photovoltaic inverter or energy storage converter 405.

[0115] S503. The second power control command is transmitted to each photovoltaic inverter or energy storage converter through the subarray controller or subarray communication equipment in the power station, so that each photovoltaic inverter or energy storage converter can respond to power based on the second power control command.

[0116] In some embodiments, after the power control device 100 at the power plant end determines a second power control command readable by each photovoltaic inverter or energy storage converter in the power plant (e.g., photovoltaic inverter or energy storage converter 203 in subarray 200, photovoltaic inverter or energy storage converter 303, photovoltaic inverter or energy storage converter 304, and photovoltaic inverter or energy storage converter 305 in subarray 300, and photovoltaic inverter or energy storage converter 403 in subarray 400), the second power control command can be transmitted to the photovoltaic inverter or energy storage converter in each subarray through the subarray controller or subarray communication device in the power plant (e.g., subarray controller 201 or subarray communication device 202 in subarray 200, subarray controller 301 or subarray communication device 302 in subarray 300, and subarray controller 401 or subarray communication device 402 in subarray 400), so that the photovoltaic inverter or energy storage converter in each subarray can respond to power based on the second power control command.

[0117] It should be noted that, in this embodiment of the application, after the power control device 100 at the power plant end sends the second power control command to the subarray controller or subarray communication device in the power plant, the subarray controller or subarray communication device will not process and decompose the second power control command through the central processing unit (CPU), but will directly send the second power control command to the target photovoltaic inverter or target energy storage converter in the subarray corresponding to the subarray controller or subarray communication device through the communication network chip. The target photovoltaic inverter or target energy storage converter is the photovoltaic inverter or energy storage converter indicated by the address identification information carried in the second power control command.

[0118] For example, when the subarray controller 201 or subarray communication device 202 in subarray 200 receives a second power control command issued by the power control device 100 at the plant end, it can determine the target photovoltaic inverter or target energy storage converter within subarray 200 based on the address identification information carried in the second power control command. For instance, if the second power control command carries photovoltaic inverter or energy storage converter 203, photovoltaic inverter or energy storage converter 303, photovoltaic inverter or energy storage converter 304, photovoltaic inverter or energy storage converter 305, etc. If the address identification information of the photovoltaic inverter or energy storage converter 403 is obtained, the subarray controller 201 or the subarray communication device 202 can determine the target photovoltaic inverter or target energy storage converter in the subarray 200 as the photovoltaic inverter or energy storage converter 203 according to the second power control command. The subarray controller 201 or the subarray communication device 202 will not process and decompose the second power control command through the CPU, but will directly send the second power control command to the photovoltaic inverter or energy storage converter 203 in the subarray 200 through the communication network chip.

[0119] It should be noted that, in this embodiment, the power control device 100 at the plant end can communicate with each photovoltaic inverter or energy storage converter via Ethernet network, fieldbus network, or a combination of both. Ethernet network communication can be generic object-oriented substation event (GOOSE) communication or user datagram protocol (UDP) communication. Fieldbus network communication can be controller area network (CAN) communication, EtherCat, Ethernet Powerlink, or process field bus-decentralized periphery (Profibus-DP) communication. This embodiment does not impose specific limitations on these methods.

[0120] For example, such as Figure 6a The diagram shows a power control device at the plant level transmitting power control commands to each photovoltaic inverter or energy storage converter according to an embodiment of this application. The power control device at the plant level communicates with each subarray controller or subarray communication device, and each subarray controller or subarray communication device communicates with the target photovoltaic inverter or target energy storage converter in the corresponding subarray via Ethernet network. The Ethernet network communication is either GOOSE communication or UDP communication.

[0121] For example, such as Figure 6b The diagram illustrates another power control device at the power plant end provided in this application, which transmits power control commands to each photovoltaic inverter or energy storage converter. When the power plant capacity is small and the total number of photovoltaic inverters or energy storage converters is also small, a fieldbus network can be directly established between the power control device at the power plant end and each photovoltaic inverter or energy storage converter for communication. The fieldbus network communication is controller area network (CAN) communication or Ethernet control automation technology (EtherCat) or open-source real-time communication technology (EthernetPowerlink).

[0122] For example, such as Figure 6c The diagram illustrates another type of power control device provided in this application, which transmits power control commands to each photovoltaic inverter or energy storage converter. The power control device communicates with each subarray controller or subarray communication device via Ethernet network, such as GOOSE or UDP. Each subarray controller or subarray communication device communicates with the target photovoltaic inverter or target energy storage converter within the corresponding subarray via fieldbus network, such as CAN, EtherCat, or Ethernet Powerlink.

[0123] Based on the above technical solution, rapid communication between the power control device 100 at the plant end and the target photovoltaic inverter or energy storage converter is realized. Although the communication route is from the power control device 100 at the plant end to the subarray controller or subarray communication device, and then from the subarray controller or subarray communication device to the target photovoltaic inverter or energy storage converter, since the subarray controller or subarray communication device only realizes network pass-through and does not make any changes to the power control command, logically, the power control device 100 at the plant end directly sends the power control command to the target photovoltaic inverter or energy storage converter via the network. That is, the power control device 100 at the plant end directly reaches the target photovoltaic inverter or energy storage converter. Compared to conventional power control devices at power plants and target photovoltaic inverters or energy storage converters, where TCP communication between the two communication points and the entire transmission process takes at least 10 milliseconds, the process from the power control device at the power plant to the subarray controller or subarray communication device, and then from the subarray controller or subarray communication device to the target photovoltaic inverter or energy storage converter, requires two handshakes, which takes 20 milliseconds. Alternatively, if the power control device at the power plant directly reaches the target photovoltaic inverter or energy storage converter, meaning the subarray controller or subarray communication device only performs network pass-through without a handshake, it still takes 10 milliseconds. In this embodiment, the power control device 100 at the power plant end communicates with the target photovoltaic inverter or energy storage converter via GOOSE, UDP, or fieldbus network communication to minimize network packet assembly and depacketization time, improve timeliness, and achieve rapid communication within 5 milliseconds between the power control device at the power plant end and the target photovoltaic inverter or energy storage converter. This preserves the technical feasibility of achieving a 30-millisecond reactive power response based on the photovoltaic inverter or energy storage converter.

[0124] The above embodiments can be used individually or in combination to achieve different technical effects.

[0125] The methods provided in the embodiments of this application above are described from the perspective of the power control device at the plant end in a power plant as the executing entity. To implement the functions of the methods provided in the embodiments of this application above, the power control device at the plant end in a power plant may include hardware structures and / or software modules, implementing the above functions in the form of hardware structures, software modules, or a combination of hardware structures and software modules. Whether a particular function is executed in the form of hardware structures, software modules, or a combination of hardware structures and software modules depends on the specific application and design constraints of the technical solution.

[0126] Based on the same technical concept, this application also provides a new energy power station 700, which includes components for performing the above-described... Figures 5-6c The method described includes a power control device, a power control command processing and forwarding device, and a power control command execution device at the plant end. For example, see [link to example]. Figure 7The device 700 may include: a power control device 701 at the plant end and at least two subarrays 702, each subarray 702 including a power control command processing and forwarding device 703 and at least three power control command execution devices 704;

[0127] The power control device 701 at the power plant end is used to determine the target value of reactive power and / or the target value of active power of the power plant 700 based on the first power control command issued by the upper-level system or the voltage and current analog signals of the grid connection point of the power plant 700 at the current moment.

[0128] The power control device 701 at the power plant is further configured to determine, based on the total reactive power target value and / or the total active power target value, a second power control instruction readable by each power control instruction execution device 704 in the power plant 700, and to send the second power control instruction to the power control instruction processing and forwarding device 703 in the power plant 700; wherein, the second power control instruction is used to indicate the power target value of each power control instruction execution device 704 when the total reactive power target value and / or the total active power target value is reached;

[0129] The power control command processing and forwarding device 703 in the power plant 700 is used to transmit the second power control command to each power control command execution device 704.

[0130] Each power control command execution device 704 is used to perform a power response based on the second power control command.

[0131] In one possible design, when the power control device 701 at the power plant end determines the target value of the total reactive power of the power plant 700 based on the first power control command issued by the upper-level system or the collected analog voltage signal at the grid connection point of the power plant 700 at the current moment, it is specifically used for:

[0132] If the first power control command issued by the superior system includes a target value for the reactive power of the entire station, then based on the first power control command, the target value for the reactive power of the entire power station 700 is determined; or,

[0133] The analog voltage signal at the grid connection point of the power station 700 at the current moment is collected, and the analog voltage signal at the current moment of the grid connection point is processed based on the voltage instantaneous amplitude calculation algorithm to determine the voltage instantaneous amplitude at the current moment of the grid connection point.

[0134] Based on the instantaneous voltage amplitude at the current grid connection point, the target reactive power value for the entire power station 700 is determined.

[0135] In one possible design, when the power control device 701 at the power plant end determines the target value of the total active power of the power plant 700 based on the first power control command issued by the upper-level system or the collected analog voltage and current signals at the grid connection point of the power plant 700, it is specifically used for:

[0136] If the first power control command issued by the superior system includes a target value for the total active power of the entire station, then based on the first power control command, the target value for the total active power of the power station 700 is determined; or...

[0137] The analog voltage and current signals at the grid connection point of the power station 700 at the current moment are collected. The analog voltage and current signals at the current moment of the grid connection point are processed based on the instantaneous amplitude calculation algorithm to determine the instantaneous active power and instantaneous voltage amplitude at the current moment of the grid connection point. Based on the instantaneous voltage amplitude, the frequency value is determined.

[0138] Based on the instantaneous active power at the current moment and the frequency value, the target value of the total active power of the power station 700 is determined.

[0139] In one possible design, the power target values ​​of each power control command execution device 704 are absolute power target values, proportional power target values, absolute change values, or proportional change values. The proportional power target value is the ratio between the absolute power target value and the rated power of the power control command execution device 704. The absolute change value is the absolute difference between the absolute power target value and the power of the power control command execution device 704 at the current moment. The proportional change value is the ratio between the absolute change value and the rated power of the power control command execution device 704.

[0140] In one possible design, the second power control instruction carries address identification information of each power control instruction execution device 704. The address identification information includes any one or more combinations of Internet Protocol (IP) address, unicast Media Access Control (MAC) address, multicast or broadcast MAC address, and a string corresponding to the target power control instruction execution device 704.

[0141] In one possible design, when the power control command processing and forwarding device 703 in the power plant 700 transmits the second power control command to each power control command execution device 704, it is specifically used for:

[0142] The power control command processing and forwarding device 703 in the power plant 700 directly sends the second power control command to the target power control command execution device 704 in the subarray 702 corresponding to the power control command processing and forwarding device 703 through the communication network chip; wherein, the target power control command execution device 704 is the power control command execution device 704 indicated by the address identification information carried in the second power control command.

[0143] In one possible design, the power control command processing and forwarding device 703 includes a subarray controller or a subarray communication device;

[0144] The subarray controller is a device installed in the subarray 702 and matched with the step-up transformer in the subarray 702. The subarray controller includes any one or more of the following: subarray data acquisition device, multi-in-one intelligent transformer substation measurement and control device, communication management device, or protocol conversion device.

[0145] The subarray communication device is any one or more of the following: network switch, gateway, fiber optic repeater, bus repeater, or bus expansion device.

[0146] The power control command execution device 704 includes a photovoltaic inverter or an energy storage converter.

[0147] In one possible design, the power control device 701 at the plant end communicates with each power control command execution device 704 via Ethernet network and / or fieldbus network.

[0148] The Ethernet network communication is either GOOSE communication for general-purpose substation events or UDP communication.

[0149] The fieldbus network communication can be any one of Controller Area Network (CAN) communication, Ethernet control automation technology (EtherCat) communication, or open-source real-time communication technology (Ethernet Powerlink).

[0150] In one possible design, the power control device 701 at the power plant end is also used for:

[0151] The analog voltage signal at the grid connection point of the power station 700 at the current moment is collected. The analog voltage signal at the current moment of the grid connection point is processed based on the voltage instantaneous amplitude calculation algorithm to determine the voltage instantaneous amplitude at the current moment of the grid connection point. Based on the voltage instantaneous amplitude, the frequency value is determined.

[0152] Based on the instantaneous voltage amplitude and frequency value at the current moment of the grid connection point, determine the total reactive power and / or total active power of the power station 700 at the current moment;

[0153] Determine whether the total reactive power and / or total active power of the power station 700 at the current moment are outside the preset range.

[0154] Based on the same technical concept, embodiments of this application also provide a device 800 for achieving fast power response. This device 800 may be a new energy power plant including a plant-side power control device and at least two subarrays, wherein each subarray includes a power control command forwarding device and at least three power control command execution devices, or it may be the plant-side power control device within the new energy power plant. For example, see [link to example]. Figure 8 The device 800 may include:

[0155] At least one processor 801, and a communication interface 803 communicatively connected to the at least one processor 801, wherein the at least one processor 801 causes the device 800 to perform operations by executing instructions stored in a memory 802. Figures 5-6c The method shown.

[0156] Optionally, the memory 802 is located outside the device 800.

[0157] Optionally, the device 800 includes a memory 802 communicatively connected to the at least one processor 801, the memory 802 storing instructions executable by the at least one processor 801. (See appendix) Figure 8 The dashed line indicates that memory 802 is optional for device 800.

[0158] The processor 801 and the memory 802 can be coupled through an interface circuit or integrated together; no restriction is imposed here.

[0159] This application embodiment does not limit the specific connection medium between the processor 801, memory 802, and communication interface 803. This application embodiment... Figure 8 The processor 801, memory 802, and communication interface 803 are connected via a bus 804. Figure 8 The connections between other components are shown in bold and are for illustrative purposes only, not as limiting information. The bus can be divided into address bus, data bus, control bus, etc. For ease of illustration, Figure 8 The bus is represented by a single thick line, but this does not mean that there is only one bus or one type of bus.

[0160] It should be understood that the processor mentioned in the embodiments of this application can be implemented in hardware or software. When implemented in hardware, the processor can be a logic circuit, integrated circuit, etc. When implemented in software, the processor can be a general-purpose processor, implemented by reading software code stored in memory.

[0161] For example, the processor can be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor can be a microprocessor or any conventional processor.

[0162] It should be understood that the memory mentioned in the embodiments of this application can be volatile memory or non-volatile memory, or may include both volatile and non-volatile memory. Non-volatile memory can be read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), or flash memory. Volatile memory can be random access memory (RAM), which is used as an external cache. By way of example, but not limitation, many forms of RAM are available, such as static random access memory (SRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory (SDRAM), double data rate synchronous dynamic random access memory (DDR SDRAM), enhanced synchronous dynamic random access memory (ESDRAM), synchronous linked dynamic random access memory (SLDRAM), and direct rambus RAM (DR RAM).

[0163] It should be noted that when the processor is a general-purpose processor, DSP, ASIC, FPGA, or other programmable logic device, discrete gate or transistor logic device, or discrete hardware component, the memory (storage module) can be integrated into the processor.

[0164] It should be noted that the memories described herein are intended to include, but are not limited to, these and any other suitable types of memories.

[0165] Based on the same technical concept, embodiments of this application also provide a computer storage medium, including a program or instructions, which, when executed on a computer, cause... Figures 5-6c The method shown was executed.

[0166] Based on the same technical concept, embodiments of this application also provide a chip, which is coupled to a memory for reading and executing program instructions stored in the memory, such that... Figures 5-6c The method shown was executed.

[0167] Based on the same technical concept, embodiments of this application also provide a computer program product, including instructions that, when executed on a computer, cause... Figures 5-6c The method shown was executed.

[0168] It should be understood that all relevant content of each step involved in the above method embodiments can be referenced from the functional description of the corresponding functional module, and will not be repeated here.

[0169] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0170] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to this application. It should be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart illustrations. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0171] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0172] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0173] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the scope of protection of this application. Therefore, if such modifications and variations fall within the scope of the claims of this application and their equivalents, this application also intends to include such modifications and variations.

Claims

1. A method for achieving fast power response, characterized in that, A power control device for power plants in new energy power plants, wherein the power plant includes at least two subarrays, each subarray includes a power control command processing and forwarding device and at least three power control command execution devices, and the method includes: Based on the first power control command issued by the superior system or the voltage and current analog signals of the grid connection point of the power station at the current moment, determine the target value of reactive power and / or the target value of active power of the power station. Based on the total reactive power target value and / or the total active power target value of the entire station, a second power control instruction readable by each power control instruction execution device in each subarray of the power station is determined; wherein, the second power control instruction is used to indicate the power target value of each power control instruction execution device when the total reactive power target value and / or the total active power target value of the entire station is reached; The second power control command is transmitted to each power control command execution device through the power control command processing and forwarding device in each subarray of the power plant, so that each power control command execution device can perform a power response based on the second power control command.

2. The method as described in claim 1, characterized in that, Based on the first power control command issued by the superior system or the collected analog voltage signal at the grid connection point of the power station at the current moment, the target value of the total reactive power of the power station is determined, including: If the first power control command issued by the superior system includes a target value for the reactive power of the entire station, then the target value for the reactive power of the entire power station is determined based on the first power control command; or, The analog voltage signal at the grid connection point of the power station at the current moment is collected. The analog voltage signal at the grid connection point at the current moment is processed based on the voltage instantaneous amplitude calculation algorithm to determine the voltage instantaneous amplitude at the grid connection point at the current moment. Based on the voltage instantaneous amplitude at the grid connection point at the current moment, the target value of reactive power of the entire power station is determined.

3. The method as described in claim 1, characterized in that, Based on the first power control command issued by the superior system or the collected analog voltage and current signals at the grid connection point of the power station at the current moment, the target value of the total active power of the power station is determined, including: If the first power control command issued by the superior system includes a target value for the total active power of the entire station, then the target value for the total active power of the power station is determined based on the first power control command; or, The analog voltage and current signals at the grid connection point of the power station are collected at the current moment. The analog voltage and current signals at the current moment of the grid connection point are processed based on the instantaneous amplitude calculation algorithm to determine the instantaneous active power and instantaneous voltage amplitude at the current moment of the grid connection point. Based on the instantaneous voltage amplitude, the frequency value is determined. Based on the instantaneous active power at the current moment and the frequency value, the target value of the total active power of the power station is determined.

4. The method as described in claim 1, characterized in that, The power target values ​​of each power control command execution device are absolute power target values, proportional power target values, absolute values ​​of change, or proportional values ​​of change. The proportional power target value is the ratio between the absolute power target value and the rated power of the power control command execution device. The absolute value of change is the absolute difference between the absolute power target value and the power of the power control command execution device at the current moment. The proportional value of change is the ratio between the absolute value of change and the rated power of the power control command execution device.

5. The method as described in claim 1 or 4, characterized in that, The second power control instruction carries the address identification information of each power control instruction execution device. The address identification information includes any one or more combinations of Internet Protocol (IP) address, unicast media access control (MAC) address, multicast or broadcast MAC address, and a string corresponding to the target power control instruction execution device.

6. The method according to any one of claims 1 to 5, characterized in that, The second power control command is transmitted to each power control command execution device through the power control command processing and forwarding device in each subarray of the power plant, including: The second power control command is sent to the power control command processing and forwarding devices in each subarray of the power plant, so that the power control command processing and forwarding devices can directly send the second power control command to the target power control command execution device in the subarray corresponding to the power control command processing and forwarding device through the communication network chip; wherein, the target power control command execution device is the power control command execution device indicated by the address identification information carried in the second power control command.

7. The method according to any one of claims 1 to 6, characterized in that, The power control command processing and forwarding device includes a subarray controller or a subarray communication device. The subarray controller is a device installed in the subarray and paired with the step-up transformer in the subarray. The subarray controller is any one or more of the following: subarray data acquisition device, multi-in-one intelligent transformer substation measurement and control device, communication management device, or protocol conversion device. The subarray communication device is any one or more of the following: network switch, gateway, fiber optic repeater, bus repeater, or bus expansion device. The power control command execution device includes a photovoltaic inverter or an energy storage converter.

8. The method according to any one of claims 1 to 7, characterized in that, The power control device at the plant end communicates with each power control command execution device via Ethernet network and / or fieldbus network. The Ethernet network communication is either GOOSE communication for general-purpose substation events or UDP communication. The fieldbus network communication can be any one of Controller Area Network (CAN) communication, Ethernet control automation technology (EtherCat) communication, or open-source real-time communication technology (Ethernet Powerlink).

9. The method according to any one of claims 1 to 8, characterized in that, Before determining the target values ​​for the total reactive power and / or the total active power of the power plant, the process also includes: The analog voltage signal at the grid connection point of the power station at the current moment is collected. The analog voltage signal at the current moment of the grid connection point is processed based on the voltage instantaneous amplitude calculation algorithm to determine the voltage instantaneous amplitude at the current moment of the grid connection point. Based on the voltage instantaneous amplitude, the frequency value is determined. Based on the instantaneous voltage amplitude and frequency value at the current moment of the grid connection point, determine the total reactive power and / or total active power of the power station at the current moment. Determine whether the total reactive power and / or total active power of the power station at the current moment are outside the preset range.

10. A new energy power station, characterized in that, It includes a power control device at the plant end and at least two subarrays, wherein the subarrays include a power control command processing and forwarding device and at least three power control command execution devices; The power control device at the power plant end is used to determine the target value of reactive power and / or the target value of active power of the power plant based on the first power control command issued by the upper-level system or the voltage and current analog signals of the grid connection point of the power plant at the current moment. The power control device at the power plant end is further configured to determine, based on the total reactive power target value and / or the total active power target value, a second power control instruction readable by each power control instruction execution device in each subarray of the power plant, and to issue the second power control instruction to the power control instruction processing and forwarding device in each subarray of the power plant; wherein, the second power control instruction is used to indicate the power target value of each power control instruction execution device when the total reactive power target value and / or the total active power target value of the power plant is reached; The power control command processing and forwarding device in each subarray of the power plant is used to pass the second power control command through to each power control command execution device. Each power control command execution device is used to perform a power response based on the second power control command.

11. The power plant as described in claim 10, characterized in that, When the power control device at the power plant end determines the target value of the total reactive power of the power plant based on the first power control command issued by the upper-level system or the collected analog voltage signal at the grid connection point of the power plant, it is specifically used for: If the first power control instruction issued by the superior system contains a target value for reactive power of the entire station, then the target value for reactive power of the entire power station is determined based on the first power control instruction. or, The analog voltage signal at the grid connection point of the power station at the current moment is collected, and the analog voltage signal at the current moment of the grid connection point is processed based on the voltage instantaneous amplitude calculation algorithm to determine the voltage instantaneous amplitude at the current moment of the grid connection point. Based on the instantaneous voltage amplitude at the current grid connection point, the target value of reactive power for the entire power station is determined.

12. The power plant as described in claim 10, characterized in that, When the power control device at the power plant end determines the target value of the total active power of the power plant based on the first power control command issued by the upper-level system or the collected analog voltage and current signals at the grid connection point of the power plant, it is specifically used for: If the first power control instruction issued by the superior system contains a target value for the active power of the entire station, then the target value for the active power of the entire station is determined based on the first power control instruction. or, The analog voltage and current signals at the grid connection point of the power station at the current moment are collected. The analog voltage and current signals at the grid connection point at the current moment are processed based on the instantaneous amplitude calculation algorithm to determine the instantaneous active power and instantaneous voltage amplitude at the grid connection point at the current moment. Based on the instantaneous voltage amplitude, the frequency value is determined. Based on the instantaneous active power at the current moment and the frequency value, the target value of the total active power of the power station is determined.

13. The power plant as described in claim 10, characterized in that, The power target values ​​of each power control command execution device are absolute power target values, proportional power target values, absolute values ​​of change, or proportional values ​​of change. The proportional power target value is the ratio between the absolute power target value and the rated power of the power control command execution device. The absolute value of change is the absolute difference between the absolute power target value and the power of the power control command execution device at the current moment. The proportional value of change is the ratio between the absolute value of change and the rated power of the power control command execution device.

14. The power plant as described in claim 10 or 13, characterized in that, The second power control instruction carries the address identification information of each power control instruction execution device. The address identification information includes any one or more combinations of Internet Protocol (IP) address, unicast media access control (MAC) address, multicast or broadcast MAC address, and a string corresponding to the target power control instruction execution device.

15. The power plant as described in any one of claims 10 to 14, characterized in that, When the power control command processing and forwarding device in each subarray of the power plant transmits the second power control command to each power control command execution device, it is specifically used for: The power control command processing and forwarding device in each subarray of the power plant directly sends the second power control command to the target power control command execution device in the subarray corresponding to the power control command processing and forwarding device through the communication network chip; wherein, the target power control command execution device is the power control command execution device indicated by the address identification information carried in the second power control command.

16. The power plant as described in any one of claims 10 to 15, characterized in that, The power control command processing and forwarding device includes a subarray controller or a subarray communication device. The subarray controller is a device installed in the subarray and paired with the step-up transformer in the subarray. The subarray controller is any one or more of the following: subarray data acquisition device, multi-in-one intelligent transformer substation measurement and control device, communication management device, or protocol conversion device. The subarray communication device is any one or more of the following: network switch, gateway, fiber optic repeater, bus repeater, or bus expansion device. The power control command execution device includes a photovoltaic inverter or an energy storage converter.

17. The power plant as described in any one of claims 10 to 16, characterized in that, The power control device at the plant end communicates with each power control command execution device via Ethernet network and / or fieldbus network. The Ethernet network communication is any one of the following: GOOSE communication for general-purpose substation events or UDP communication; the fieldbus network communication is any one of the following: CAN communication for controller area networks, EtherCat communication for Ethernet control automation technology, or Ethernet Powerlink communication for open-source real-time communication technology.

18. The power plant as described in any one of claims 10 to 17, characterized in that, The power control device at the plant end is also used for: The analog voltage signal at the grid connection point of the power station at the current moment is collected. The analog voltage signal at the current moment of the grid connection point is processed based on the voltage instantaneous amplitude calculation algorithm to determine the voltage instantaneous amplitude at the current moment of the grid connection point. Based on the voltage instantaneous amplitude, the frequency value is determined. Based on the instantaneous voltage amplitude and frequency value at the current moment of the grid connection point, determine the total reactive power and / or total active power of the power station at the current moment. Determine whether the total reactive power and / or total active power of the power station at the current moment are outside the preset range.

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