Dynamic reactive power compensation capacity configuration method, device and equipment for new energy power transmission systems

Abstract

This application relates to a method, apparatus, and equipment for configuring dynamic reactive power compensation capacity in a renewable energy power transmission system. The method includes obtaining the reactive power demand increment and total reactive power demand of the renewable energy power transmission system; obtaining the capacitor compensation recovery coefficient for reactive power compensation under fault conditions based on the total reactive power demand of the renewable energy power transmission system; calculating the fault recovery reactive power based on the capacitor compensation recovery coefficient and the reactive power calculation formula; and determining the dynamic reactive power compensation capacity based on the reactive power demand increment and the fault recovery reactive power. This method obtains the reactive power demand increment and fault recovery reactive power under power changes and fault conditions, and determines the required dynamic reactive power compensation capacity for the renewable energy power transmission system based on these parameters, thereby ensuring the stable operation of the renewable energy power transmission system.

Description

Technical Field

[0001] This application relates to the field of new energy power system technology, and in particular to a method, apparatus and equipment for configuring dynamic reactive power compensation capacity in a new energy power transmission system. Background Technology

[0002] Existing photovoltaic and wind power generation plants do not generate reactive power during normal operation and have poor voltage regulation capabilities. Dynamic reactive power compensation devices, however, respond quickly, regulate voltage under steady-state power system conditions, and provide reactive power support to the power system after short-circuit faults, enhancing power system stability. To ensure the safe and stable operation of renewable energy generation systems after power fluctuations or short-circuit faults, dynamic reactive power compensation devices such as SVG and synchronous condensers are typically installed at renewable energy power plants.

[0003] Determining the dynamic reactive power compensation capacity scientifically and rationally has become a crucial task in the planning and design phase of renewable energy power transmission systems. Currently, the reactive power balance method can calculate the total reactive power compensation capacity demand of the power system under steady-state conditions. However, the total reactive power compensation demand obtained by the reactive power balance method cannot distinguish between static and dynamic reactive power compensation capacity demand. Current methods for determining dynamic reactive power capacity demand typically allocate it as a fixed proportion of the total capacity of renewable energy power plants, a method that is crude and lacks scientific rigor.

[0004] Dynamic reactive power compensation devices in new energy power transmission systems can support system voltage by outputting reactive power under both steady-state and fault conditions. Therefore, the capacity of the dynamic reactive power compensation device can be divided into two parts to meet the needs under steady-state and transient conditions respectively. Summary of the Invention

[0005] This application provides a method, apparatus, and equipment for configuring dynamic reactive power compensation capacity in a new energy power transmission system, which addresses the technical problem that the demand for dynamic reactive power compensation devices in existing new energy power systems is not reasonably configured according to the system's needs.

[0006] To achieve the above objectives, the embodiments of this application provide the following technical solutions:

[0007] A method for configuring dynamic reactive power compensation capacity in a new energy power transmission system includes the following steps:

[0008] Based on the renewable energy power transmission system, the incremental reactive power demand and the total reactive power demand under the rated power steady-state condition are obtained, and the capacitor compensation recovery coefficient of the renewable energy power transmission system for reactive power compensation under fault conditions is obtained based on the total reactive power demand.

[0009] Based on the capacitor compensation recovery coefficient and the reactive power calculation formula, the fault recovery reactive power of the new energy power transmission system under fault conditions is obtained; the dynamic reactive power compensation capacity is determined based on the reactive power demand increment and the fault recovery reactive power.

[0010] Preferably, the dynamic reactive power compensation capacity configuration method of the new energy power transmission system includes: allocating the dynamic reactive power compensation capacity based on steady-state reactive power capacity and transient reactive power capacity.

[0011] Preferably, the dynamic reactive power compensation capacity configuration method for the new energy power transmission system includes: verifying the new energy power transmission system with allocated dynamic reactive power compensation capacity according to power change conditions and transient fault conditions, and the verification content includes:

[0012] The operation of the first system and the second system is controlled according to the power change to obtain the first voltage information, which includes the first voltage corresponding to the first system and the second voltage corresponding to the second system.

[0013] Controlling the operation of the first system and the second system according to the transient fault condition, obtaining the second voltage information, the second voltage information includes the third voltage corresponding to the first system and the fourth voltage corresponding to the second system;

[0014] The dynamic reactive power compensation capacity of the new energy power transmission system is adjusted according to the first voltage information or the second voltage information.

[0015] The first system is a new energy power transmission system that uses parallel capacitors for reactive power compensation, and the second system is a new energy power transmission system that has been allocated the dynamic reactive power compensation capacity for reactive power compensation.

[0016] Preferably, adjusting the dynamic reactive power compensation capacity of the new energy power transmission system based on the first voltage information includes:

[0017] If both the first voltage and the second voltage are within the normal voltage range of their respective systems, then the dynamic reactive power compensation capacity of the second system is redundant, thus reducing the dynamic reactive power compensation capacity of the second system.

[0018] If the first voltage is lower than the normal voltage range of the first system and the first system is in a voltage instability state, and the second voltage is within the normal voltage range of the second system, then the dynamic reactive power compensation capacity of the second system meets the reactive power compensation requirements.

[0019] If the second voltage is lower than the normal voltage range of the second system and the second system is in a voltage instability state, then increase the dynamic reactive power compensation capacity of the second system.

[0020] Preferably, adjusting the dynamic reactive power compensation capacity of the new energy power transmission system according to the second voltage information includes:

[0021] If both the third voltage and the fourth voltage recover to the normal voltage of the system, then the dynamic reactive power compensation capacity of the second system is redundant, thus reducing the dynamic reactive power compensation capacity of the second system.

[0022] If the third voltage cannot be restored to the normal voltage of the first system, and the fourth voltage is restored to the normal voltage of the second system, then the dynamic reactive power compensation capacity of the second system meets the reactive power compensation requirements.

[0023] If the fourth voltage cannot be restored to the normal voltage of the second system, then the dynamic reactive power compensation capacity of the second system is increased.

[0024] Preferably, the reactive power calculation formula is: Q2≈m 2 *Q L -k 2 *Q B -k 2 *Q c In the formula, m is the current recovery coefficient of the capacitor compensation recovery coefficient, k is the voltage recovery coefficient of the capacitor compensation recovery coefficient, and Q... L Q represents the reactive power loss of a new energy power transmission system at rated power. B Q represents the line charging power of a new energy power transmission system at rated power. c Q1 represents the capacitor compensation capacity for the total reactive power demand, k < 1, and Q2 represents the reactive power for fault recovery.

[0025] Preferably, the dynamic reactive power compensation capacity configuration method of the new energy power transmission system includes: taking the capacity that meets the reactive power demand of the new energy power transmission system under power fluctuation as the steady-state reactive power capacity, and taking the difference between the dynamic reactive power compensation capacity and the steady-state reactive power capacity as the transient reactive power capacity; performing dynamic reactive power compensation on the new energy power transmission system according to the allocated steady-state reactive power capacity and transient reactive power capacity; wherein, the transient reactive power capacity meets the reactive power demand of the new energy power transmission system under fault conditions.

[0026] This application also provides a dynamic reactive power compensation capacity configuration device for a new energy power transmission system, comprising: a data acquisition module and a calculation module;

[0027] The data acquisition module is used to acquire the reactive power demand increment and the total reactive power demand under the rated power steady-state condition of the new energy power transmission system, and to acquire the capacitor compensation recovery coefficient of the new energy power transmission system for reactive power compensation under fault conditions based on the total reactive power demand.

[0028] The calculation module is used to calculate, based on the capacitor compensation recovery coefficient and the reactive power calculation formula, the fault recovery reactive power of the new energy power transmission system under fault conditions; and to determine the dynamic reactive power compensation capacity based on the reactive power demand increment and the fault recovery reactive power.

[0029] The reactive power calculation formula is: Q2≈m 2 *Q L -k 2 *Q B -k 2 *Q c In the formula, m is the current recovery coefficient of the capacitor compensation recovery coefficient, k is the voltage recovery coefficient of the capacitor compensation recovery coefficient, and Q... L Q represents the reactive power loss of a new energy power transmission system at rated power. B Q represents the line charging power of a new energy power transmission system at rated power. c Q1 represents the capacitor compensation capacity for the total reactive power demand, k < 1, and Q2 represents the reactive power for fault recovery.

[0030] Preferably, the dynamic reactive power compensation capacity configuration device of the new energy power transmission system includes a verification module and a capacity allocation module. The capacity allocation module is used to allocate the dynamic reactive power compensation capacity based on steady-state reactive power capacity and transient reactive power capacity. The verification module is used to verify the new energy power transmission system with allocated dynamic reactive power compensation capacity according to power change conditions and transient fault conditions. The verification module includes a first information acquisition submodule, a second information acquisition submodule, and a verification adjustment submodule.

[0031] The first information acquisition submodule is used to control the operation of the first system and the second system according to the power change and obtain the first voltage information, which includes a first voltage corresponding to the first system and a second voltage corresponding to the second system.

[0032] The second information acquisition submodule is used to control the operation of the first system and the second system according to the transient fault condition and obtain the second voltage information, which includes a third voltage corresponding to the first system and a fourth voltage corresponding to the second system.

[0033] The verification and adjustment submodule is used to adjust the dynamic reactive power compensation capacity of the new energy power transmission system according to the first voltage information or the second voltage information.

[0034] The first system is a new energy power transmission system that uses parallel capacitors for reactive power compensation, and the second system is a new energy power transmission system that has been allocated the dynamic reactive power compensation capacity for reactive power compensation.

[0035] Preferably, the verification and adjustment submodule is further configured to: if both the first voltage and the second voltage are within the normal voltage range of their respective systems, then the dynamic reactive power compensation capacity of the second system is redundant, and the dynamic reactive power compensation capacity of the second system is reduced; if the first voltage is lower than the normal voltage range of the first system and the first system is in a voltage unstable state, and the second voltage is within the normal voltage range of the second system, then the dynamic reactive power compensation capacity of the second system meets the reactive power compensation requirements; if the second voltage is lower than the normal voltage range of the second system and the second system is in a voltage unstable state, then the dynamic reactive power compensation capacity of the second system is increased; if both the third voltage and the fourth voltage recover to the normal voltage of their respective systems, then the dynamic reactive power compensation capacity of the second system is redundant, and the dynamic reactive power compensation capacity of the second system is reduced; if the third voltage cannot recover to the normal voltage of the first system, and the fourth voltage recovers to the normal voltage of the second system, then the dynamic reactive power compensation capacity of the second system meets the reactive power compensation requirements; if the fourth voltage cannot recover to the normal voltage of the second system, then the dynamic reactive power compensation capacity of the second system is increased.

[0036] This application also provides a terminal device, including a processor and a memory;

[0037] The memory is used to store program code and transmit the program code to the processor;

[0038] The processor is used to execute the dynamic reactive power compensation capacity configuration method of the new energy power transmission system described above, according to the instructions in the program code.

[0039] As can be seen from the above technical solutions, the embodiments of this application have the following advantages: The method, device, and equipment for configuring dynamic reactive power compensation capacity of the new energy power transmission system include obtaining the reactive power demand increment and the total reactive power demand under the rated power steady-state condition of the new energy power transmission system, and obtaining the capacitor compensation recovery coefficient for reactive power compensation under fault conditions based on the total reactive power demand of the new energy power transmission system; calculating the fault recovery reactive power of the new energy power transmission system under fault conditions based on the capacitor compensation recovery coefficient and the reactive power calculation formula; and determining the dynamic reactive power compensation capacity based on the reactive power demand increment and the fault recovery reactive power. This method for configuring dynamic reactive power compensation capacity of the new energy power transmission system obtains the reactive power demand increment and the fault recovery reactive power under power changes and fault conditions, and determines the dynamic reactive power compensation capacity that the new energy power transmission system needs to configure based on the reactive power demand increment and the fault recovery reactive power, thereby determining the dynamic reactive power compensation capacity that needs to be configured for the new energy power transmission system, ensuring the stable operation of the new energy power transmission system, and solving the technical problem that the demand of the existing dynamic reactive power compensation device of the new energy power system is not reasonably configured according to the system demand. Attached Figure Description

[0040] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0041] Figure 1 This is a flowchart illustrating the steps of the dynamic reactive power compensation capacity configuration method for the new energy power transmission system described in this application embodiment;

[0042] Figure 2 This is a framework diagram of the new energy power transmission system in the dynamic reactive power compensation capacity configuration method of the new energy power transmission system described in the embodiments of this application;

[0043] Figure 3 This is a framework diagram of the dynamic reactive power compensation capacity configuration device for a new energy power transmission system according to an embodiment of this application. Detailed Implementation

[0044] To make the inventive objectives, features, and advantages of this application more apparent and understandable, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described below are only some embodiments of this application, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0045] This application provides a method, apparatus, and equipment for configuring dynamic reactive power compensation capacity in a new energy power transmission system. It calculates the reactive power of the new energy power transmission system to determine the dynamic reactive power compensation capacity that the system needs to configure, thereby solving the technical problem that the demand for dynamic reactive power compensation devices in existing new energy power systems is not reasonably configured according to the system's needs.

[0046] Example 1:

[0047] Figure 1 This is a flowchart illustrating the steps of the dynamic reactive power compensation capacity configuration method for the new energy power transmission system described in this application embodiment. Figure 2 This is a framework diagram of the new energy power transmission system in the dynamic reactive power compensation capacity configuration method of the new energy power transmission system described in the embodiments of this application.

[0048] like Figure 1 As shown in the figure, this application provides a method for configuring dynamic reactive power compensation capacity in a new energy power transmission system, including the following steps:

[0049] S1. Obtain the reactive power demand increment and the total reactive power demand under the rated power steady-state condition based on the new energy power transmission system, and obtain the capacitor compensation recovery coefficient of the new energy power transmission system for reactive power compensation under fault conditions based on the total reactive power demand.

[0050] It should be noted that in step S1, the first step is to obtain the reactive power demand increment and the total reactive power demand; the second step is to simulate fault conditions in the power system simulation model based on the total reactive power demand to obtain the capacitor compensation recovery coefficient. In this embodiment, as... Figure 2 As shown, the new energy power transmission system includes a receiving-end system and a photovoltaic power station connected to the receiving-end system via an AC line. The photovoltaic power station is equipped with reactive power compensation and dynamic reactive power compensation via parallel capacitors.

[0051] In this embodiment, the reactive power demand increment is obtained by performing reactive power balance calculations on the new energy power transmission system after a sudden power fluctuation. The incremental reactive power demand is calculated under typical power fluctuation conditions, where the power system power will suddenly continue to increase.

[0052] It should be noted that incremental reactive power can be understood as follows: if the reactive power required by the renewable energy transmission system is Qa at a power level Pa, according to reactive power balance calculation, and the power changes to reach a power level Pb, the reactive power Qb is obtained using the same reactive power balance calculation. The incremental reactive power is then ΔQ = Qb - Qa. In this embodiment, reactive power balance calculation is a well-established technique in the field of power systems and is not limited here.

[0053] In this embodiment, the total reactive power demand Q1 is based on the reactive power loss Q of the renewable energy transmission system under rated power. L The line charging power Q of the new energy power transmission system under rated power B The result is obtained through calculation, i.e., Q1=Q L -Q B .

[0054] It should be noted that the total reactive power demand Q1 includes the capacitor compensation capacity Q. C and dynamic reactive power compensation capacity Q S .

[0055] In this embodiment, the capacitor compensation recovery coefficient is obtained based on the scenario where the total reactive power demand Q1 required by the new energy power transmission system is entirely compensated by capacitors. Fault conditions are simulated in the power system simulation model to obtain the fault voltage and fault current before and after the fault, as well as the recovery voltage and recovery current after the fault for each photovoltaic power station. The voltage recovery coefficient of the capacitor compensation recovery coefficient is obtained by comparing the fault voltage and the recovery voltage. The current recovery coefficient of the capacitor compensation recovery coefficient is obtained by comparing the fault current and the recovery current.

[0056] It should be noted that the capacitor compensation recovery coefficient refers to the recovery of voltage and current before and after a fault in the renewable energy power transmission system, i.e., how many times the voltage and current recover to their pre-fault levels after the fault. The fault condition generally refers to a three-phase short-circuit N-1 fault in the renewable energy power transmission system. Electromagnetic transient simulation is preferred for power system simulation models, but electromechanical transient simulation can also be used.

[0057] S2. Based on the capacitor compensation recovery coefficient and the reactive power calculation formula, the fault recovery reactive power of the new energy power transmission system under fault conditions is obtained; the dynamic reactive power compensation capacity is determined based on the reactive power demand increment and the fault recovery reactive power.

[0058] It should be noted that in step S2, the first step is to calculate the reactive power for fault recovery, and the second step is to calculate the dynamic reactive power compensation capacity. In this embodiment, the dynamic reactive power compensation capacity is obtained by adding the reactive power demand increment to the reactive power for fault recovery.

[0059] Furthermore, the reactive power calculation formula is: Q²≈m 2 *Q L -k 2 *Q B -k 2 *Q c In the formula, m is the current recovery coefficient of the capacitor compensation recovery coefficient, k is the voltage recovery coefficient of the capacitor compensation recovery coefficient, and Q... L Q represents the reactive power loss of a new energy power transmission system at rated power. B Q represents the line charging power of a new energy power transmission system at rated power. c The capacitor compensation capacity is k<1, where k is the total reactive power demand and Q2 is the reactive power for fault recovery. Here, k and m are both non-zero natural numbers.

[0060] It should be noted that the calculated reactive power recovery Q2 is based on the total reactive power demand Q1, with adjustments made to Q1 based on the actual voltage and current after the fault. This yields the remaining reactive power deficit after the fault, specifically the reactive power recovery Q2 (after deducting capacitor compensation k). 2 *Q c ).

[0061] This application provides a method for configuring dynamic reactive power compensation capacity in a renewable energy power transmission system. The method includes obtaining the reactive power demand increment and the total reactive power demand under rated power steady-state conditions based on the renewable energy power transmission system; obtaining the capacitor compensation recovery coefficient for reactive power compensation under fault conditions based on the total reactive power demand of the renewable energy power transmission system; calculating the fault recovery reactive power of the renewable energy power transmission system under fault conditions based on the capacitor compensation recovery coefficient and the reactive power calculation formula; and determining the dynamic reactive power compensation capacity based on the reactive power demand increment and fault recovery reactive power. This method for configuring dynamic reactive power compensation capacity in a renewable energy power transmission system obtains the reactive power demand increment and fault recovery reactive power under power changes and fault conditions, and determines the required dynamic reactive power compensation capacity based on these parameters. This ensures the stable operation of the renewable energy power transmission system and solves the technical problem that the demand for dynamic reactive power compensation devices in existing renewable energy power systems is not rationally configured according to the system's needs.

[0062] In one embodiment of this application, the dynamic reactive power compensation capacity configuration method of the new energy power transmission system includes: allocating dynamic reactive power compensation capacity based on steady-state reactive power capacity and transient reactive power capacity.

[0063] It should be noted that in this step, the dynamic reactive power compensation capacity obtained in step S2 is reasonably allocated according to the steady-state reactive power capacity and the transient reactive power capacity, so that the new energy power transmission system can perform reactive power compensation according to the allocated dynamic reactive power compensation capacity, thereby ensuring the stable operation of the new energy power transmission system and avoiding resource waste.

[0064] Furthermore, the dynamic reactive power compensation capacity configuration method for the new energy power transmission system includes allocating the dynamic reactive power compensation capacity as follows: the capacity that meets the reactive power demand of the new energy power transmission system under power fluctuation is taken as the steady-state reactive power capacity, and the difference between the dynamic reactive power compensation capacity and the steady-state reactive power capacity is taken as the transient reactive power capacity; dynamic reactive power compensation is performed on the new energy power transmission system according to the allocated steady-state reactive power capacity and transient reactive power capacity; wherein, the transient reactive power capacity meets the reactive power demand of the new energy power transmission system under fault conditions.

[0065] It should be noted that steady-state reactive power capacity refers to the reactive power compensation of a renewable energy transmission system under steady-state operating conditions. Dynamic reactive power compensation prevents voltage instability caused by insufficient reactive power due to the inability of the parallel capacitors in the photovoltaic power station to switch on and off in time after a sudden power fluctuation. For example, when the power of the renewable energy transmission system is 0.9*Pmax, ±10% of Pmax can be considered as the steady-state reactive power capacity. The steady-state reactive power capacity can also be used as the upper limit of the reactive power output of the renewable energy transmission system under steady-state operating conditions. Here, Pmax is the static stability limit power of the renewable energy transmission system. Transient reactive power capacity can also be called the reserved residual capacity of dynamic reactive power compensation capacity. Transient reactive power capacity needs to meet the reactive power requirements of the renewable energy transmission system during power recovery after a short-circuit fault.

[0066] In this embodiment, the dynamic reactive power compensation capacity configuration method of the new energy power transmission system allocates the dynamic reactive power compensation capacity to prioritize meeting the reactive power demand after the power fluctuation and fault of the new energy power transmission system. After the new energy power transmission system with the allocated dynamic reactive power compensation capacity enters steady-state operation, the capacitor should be put into operation first for reactive power compensation, so that the output of the dynamic reactive power compensation device is reduced and sufficient capacity is reserved.

[0067] The dynamic reactive power compensation capacity configuration method for this new energy power transmission system includes: verifying the new energy power transmission system with allocated dynamic reactive power compensation capacity according to power change conditions and transient fault conditions, and the verification content includes:

[0068] The operation of the first system and the second system is controlled according to the power change to obtain the first voltage information, which includes the first voltage corresponding to the first system and the second voltage corresponding to the second system.

[0069] The operation of the first and second systems is controlled according to the transient fault condition to obtain the second voltage information, which includes the third voltage corresponding to the first system and the fourth voltage corresponding to the second system.

[0070] Adjust the dynamic reactive power compensation capacity of the new energy power transmission system according to the first voltage information or the second voltage information.

[0071] The first system is a new energy power transmission system that uses parallel capacitors for reactive power compensation, and the second system is a new energy power transmission system that uses the allocated dynamic reactive power compensation capacity for reactive power compensation.

[0072] It should be noted that the allocated steady-state reactive power capacity and transient reactive power capacity are verified using power change and transient fault conditions, respectively, to check whether the allocated steady-state and transient reactive power capacity can meet the dynamic reactive power compensation requirements of the renewable energy transmission system. In this embodiment, the power change condition refers to: on the power system simulation model, setting two parameters—power step increases of 0.9*Pmax and 0.08Pmax—for simulation operation to obtain the first voltage information of the renewable energy transmission system and whether the voltage is in a stable state. The transient fault condition refers to: on the power system simulation model, setting the parameter of a three-phase short-circuit fault in the renewable energy transmission system for simulation operation to obtain the second voltage information of the renewable energy transmission system and whether the voltage is in a stable state.

[0073] Furthermore, adjusting the dynamic reactive power compensation capacity of the new energy power transmission system based on the first voltage information includes:

[0074] If both the first voltage and the second voltage are within the normal voltage range of the system, then the dynamic reactive power compensation capacity of the second system is redundant, thus reducing the dynamic reactive power compensation capacity of the second system.

[0075] If the first voltage is lower than the normal voltage range of the first system and the first system is in a voltage instability state, and the second voltage is within the normal voltage range of the second system, then the dynamic reactive power compensation capacity of the second system meets the reactive power compensation requirements.

[0076] If the second voltage is lower than the normal voltage range of the second system and the second system is in a voltage instability state, then increase the dynamic reactive power compensation capacity of the second system.

[0077] Furthermore, adjusting the dynamic reactive power compensation capacity of the new energy power transmission system based on the second voltage information includes:

[0078] If the third and fourth voltages both recover to the normal voltage of their respective systems, then the dynamic reactive power compensation capacity of the second system is redundant, thus reducing the dynamic reactive power compensation capacity of the second system.

[0079] If the third voltage cannot be restored to the normal voltage of the first system, and the fourth voltage is restored to the normal voltage of the second system, then the dynamic reactive power compensation capacity of the second system meets the reactive power compensation requirements.

[0080] If the fourth voltage cannot be restored to the normal voltage of the second system, then the dynamic reactive power compensation capacity of the second system should be increased.

[0081] Example 2:

[0082] Figure 3 This is a flowchart illustrating the framework of the dynamic reactive power compensation capacity configuration device for the new energy power transmission system described in this application embodiment.

[0083] like Figure 3 As shown in the figure, this application embodiment provides a dynamic reactive power compensation capacity configuration device for a new energy power transmission system, including: a data acquisition module 10 and a calculation module 20;

[0084] The data acquisition module 10 is used to acquire the reactive power demand increment and the total reactive power demand under the rated power steady-state condition of the new energy power transmission system, and to acquire the capacitor compensation recovery coefficient of the new energy power transmission system for reactive power compensation under fault conditions based on the total reactive power demand.

[0085] Calculation module 20 is used to calculate the fault recovery reactive power of the new energy power transmission system under fault conditions based on the capacitor compensation recovery coefficient and the reactive power calculation formula; and to determine the dynamic reactive power compensation capacity based on the reactive power demand increment and the fault recovery reactive power.

[0086] The reactive power calculation formula is: Q2≈m 2 *Q L -k 2 *Q B -k 2 *Q c In the formula, m is the current recovery coefficient of the capacitor compensation recovery coefficient, k is the voltage recovery coefficient of the capacitor compensation recovery coefficient, and Q... L Q represents the reactive power loss of a new energy power transmission system at rated power. B Q represents the line charging power of a new energy power transmission system at rated power. c Q1 represents the capacitor compensation capacity for the total reactive power demand, k < 1, and Q2 represents the reactive power for fault recovery.

[0087] In this embodiment, the dynamic reactive power compensation capacity configuration device for the new energy power transmission system includes a capacity allocation module 30 and a verification module 40. The capacity allocation module 30 is used to allocate dynamic reactive power compensation capacity based on steady-state reactive power capacity and transient reactive power capacity. The verification module 40 is used to verify the new energy power transmission system with allocated dynamic reactive power compensation capacity according to power change conditions and transient fault conditions. The verification module includes a first information acquisition submodule, a second information acquisition submodule, and a verification adjustment submodule.

[0088] The first information acquisition submodule is used to control the operation of the first system and the second system according to the power change and to obtain the first voltage information, which includes the first voltage corresponding to the first system and the second voltage corresponding to the second system.

[0089] The second information acquisition submodule is used to control the operation of the first system and the second system according to the transient fault condition and obtain the second voltage information, which includes the third voltage corresponding to the first system and the fourth voltage corresponding to the second system.

[0090] The verification and adjustment submodule is used to adjust the dynamic reactive power compensation capacity of the new energy power transmission system according to the first voltage information or the second voltage information.

[0091] The first system is a new energy power transmission system that uses parallel capacitors for reactive power compensation, and the second system is a new energy power transmission system that uses allocated dynamic reactive power compensation capacity for reactive power compensation.

[0092] In this embodiment, the verification and adjustment submodule is further configured to: if the first voltage and the second voltage are both within the normal voltage range of the system, then the dynamic reactive power compensation capacity of the second system is redundant, and the dynamic reactive power compensation capacity of the second system is reduced; if the first voltage is lower than the normal voltage range of the first system and the first system is in a voltage unstable state, and the second voltage is within the normal voltage range of the second system, then the dynamic reactive power compensation capacity of the second system meets the reactive power compensation requirements; if the second voltage is lower than the normal voltage range of the second system and the second system is in a voltage unstable state, then the dynamic reactive power compensation capacity of the second system is increased; if the third voltage and the fourth voltage both recover to the normal voltage of the system, then the dynamic reactive power compensation capacity of the second system is redundant, and the dynamic reactive power compensation capacity of the second system is reduced; if the third voltage cannot recover to the normal voltage of the first system, and the fourth voltage recovers to the normal voltage of the second system, then the dynamic reactive power compensation capacity of the second system meets the reactive power compensation requirements; if the fourth voltage cannot recover to the normal voltage of the second system, then the dynamic reactive power compensation capacity of the second system is increased.

[0093] It should be noted that the modules in the device of Embodiment 2 correspond to the steps in the method of Embodiment 1. The content of the dynamic reactive power compensation capacity configuration method of the new energy power transmission system has been described in detail in Embodiment 1, and the content of the modules in the device will not be described in detail in this Embodiment 2.

[0094] Example 3:

[0095] This application provides a terminal device, including a processor and a memory;

[0096] Memory is used to store program code and transfer the program code to the processor;

[0097] The processor is used to execute the dynamic reactive power compensation capacity configuration method of the new energy power transmission system according to the instructions in the program code.

[0098] It should be noted that the processor is used to execute the steps in the above-described embodiment of a dynamic reactive power compensation capacity configuration method for a new energy power transmission system according to the instructions in the program code. Alternatively, when the processor executes the computer program, it implements the functions of each module / unit in the above-described system / device embodiments.

[0099] For example, a computer program can be divided into one or more modules / units, one or more of which are stored in memory and executed by a processor to complete this application. One or more modules / units can be a series of computer program instruction segments capable of performing a specific function, which describe the execution process of the computer program in a terminal device.

[0100] Terminal devices can be computing devices such as desktop computers, laptops, handheld computers, and cloud servers. Terminal devices may include, but are not limited to, processors and memory. Those skilled in the art will understand that this does not constitute a limitation on the terminal device, which may include more or fewer components than illustrated, or combinations of certain components, or different components. For example, a terminal device may also include input / output devices, network access devices, buses, etc.

[0101] The processor referred to 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.

[0102] Memory can be an internal storage unit of a terminal device, such as a hard drive or RAM. Memory can also be an external storage device, such as a plug-in hard drive, SmartMedia Card (SMC), Secure Digital (SD) card, or Flash Card. Furthermore, memory can include both internal and external storage units. Memory is used to store computer programs and other programs and data required by the terminal device. Memory can also be used to temporarily store data that has been output or will be output.

[0103] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0104] In the several embodiments provided in this application, it should be understood that the disclosed systems, apparatuses, and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection between apparatuses or units through some interfaces, and may be electrical, mechanical, or other forms.

[0105] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0106] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0107] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0108] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A method for configuring dynamic reactive power compensation capacity in a new energy power transmission system, characterized in that, Includes the following steps: Based on the renewable energy power transmission system, the incremental reactive power demand and the total reactive power demand under the rated power steady-state condition are obtained, and the capacitor compensation recovery coefficient of the renewable energy power transmission system for reactive power compensation under fault conditions is obtained based on the total reactive power demand. Based on the capacitor compensation recovery coefficient and the reactive power calculation formula, the fault recovery reactive power of the new energy power transmission system under fault conditions is obtained. The dynamic reactive power compensation capacity is determined based on the reactive power demand increment and the fault recovery reactive power. The reactive power calculation formula is: Q2≈m 2 *Q L -k 2 *Q B -k 2 *Q c In the formula, m is the current recovery coefficient of the capacitor compensation recovery coefficient, k is the voltage recovery coefficient of the capacitor compensation recovery coefficient, and Q... L Q represents the reactive power loss of a new energy power transmission system at rated power. B Q represents the line charging power of a new energy power transmission system at rated power. c Q1 represents the capacitor compensation capacity for the total reactive power demand, k < 1, and Q2 represents the reactive power for fault recovery.

2. The dynamic reactive power compensation capacity configuration method for a new energy power transmission system according to claim 1, characterized in that, include: The dynamic reactive power compensation capacity is allocated based on steady-state reactive power capacity and transient reactive power capacity.

3. The dynamic reactive power compensation capacity configuration method for a new energy power transmission system according to claim 2, characterized in that, include: The new energy power transmission system with allocated dynamic reactive power compensation capacity is verified according to power change conditions and transient fault conditions. The verification content includes: The operation of the first system and the second system is controlled according to the power change to obtain the first voltage information, which includes the first voltage corresponding to the first system and the second voltage corresponding to the second system. Controlling the operation of the first system and the second system according to the transient fault condition, obtaining the second voltage information, the second voltage information includes the third voltage corresponding to the first system and the fourth voltage corresponding to the second system; The dynamic reactive power compensation capacity of the new energy power transmission system is adjusted according to the first voltage information or the second voltage information. Wherein, the first system is a new energy power transmission system that uses parallel capacitors for reactive power compensation, and the second system is a new energy power transmission system that has been allocated the dynamic reactive power compensation capacity for reactive power compensation; the power change condition refers to simulating the operation of the new energy power transmission system with power step increases of 0.9*Pmax and 0.08Pmax respectively on the power system simulation model; the transient fault condition refers to simulating the operation of the new energy power transmission system with a three-phase short-circuit fault on the power system simulation model; Pmax is the static stability limit power of the new energy power transmission system.

4. The dynamic reactive power compensation capacity configuration method for a new energy power transmission system according to claim 3, characterized in that, Adjusting the dynamic reactive power compensation capacity of the new energy power transmission system based on the first voltage information includes: If both the first voltage and the second voltage are within the normal voltage range of their respective systems, then the dynamic reactive power compensation capacity of the second system is redundant, thus reducing the dynamic reactive power compensation capacity of the second system. If the first voltage is lower than the normal voltage range of the first system and the first system is in a voltage instability state, and the second voltage is within the normal voltage range of the second system, then the dynamic reactive power compensation capacity of the second system meets the reactive power compensation requirements. If the second voltage is lower than the normal voltage range of the second system and the second system is in a voltage instability state, then increase the dynamic reactive power compensation capacity of the second system.

5. The dynamic reactive power compensation capacity configuration method for a new energy power transmission system according to claim 3, characterized in that, Adjusting the dynamic reactive power compensation capacity of the new energy power transmission system based on the second voltage information includes: If both the third voltage and the fourth voltage recover to the normal voltage of the system, then the dynamic reactive power compensation capacity of the second system is redundant, thus reducing the dynamic reactive power compensation capacity of the second system. If the third voltage cannot be restored to the normal voltage of the first system, and the fourth voltage is restored to the normal voltage of the second system, then the dynamic reactive power compensation capacity of the second system meets the reactive power compensation requirements. If the fourth voltage cannot be restored to the normal voltage of the second system, then the dynamic reactive power compensation capacity of the second system is increased.

6. The dynamic reactive power compensation capacity configuration method for a new energy power transmission system according to claim 2, characterized in that, include: The capacity that meets the reactive power demand of the new energy power transmission system under power fluctuation is defined as the steady-state reactive power capacity, and the difference between the dynamic reactive power compensation capacity and the steady-state reactive power capacity is defined as the transient reactive power capacity. Dynamic reactive power compensation is performed on the renewable energy power transmission system based on the allocated steady-state reactive power capacity and transient reactive power capacity; wherein, the transient reactive power capacity meets the reactive power requirements of the renewable energy power transmission system under fault conditions.

7. A dynamic reactive power compensation capacity configuration device for a new energy power transmission system, characterized in that, include: Data acquisition module and calculation module; The data acquisition module is used to acquire the reactive power demand increment and the total reactive power demand under the rated power steady-state condition of the new energy power transmission system, and to acquire the capacitor compensation recovery coefficient of the new energy power transmission system for reactive power compensation under fault conditions based on the total reactive power demand. The calculation module is used to calculate, based on the capacitor compensation recovery coefficient and the reactive power calculation formula, the fault recovery reactive power of the new energy power transmission system under fault conditions. The dynamic reactive power compensation capacity is determined based on the reactive power demand increment and the fault recovery reactive power. The reactive power calculation formula is: Q2≈m 2 *Q L -k 2 *Q B -k 2 *Q c In the formula, m is the current recovery coefficient of the capacitor compensation recovery coefficient, k is the voltage recovery coefficient of the capacitor compensation recovery coefficient, and Q... L Q represents the reactive power loss of a new energy power transmission system at rated power. B Q represents the line charging power of a new energy power transmission system at rated power. c Q1 represents the capacitor compensation capacity for the total reactive power demand, k < 1, and Q2 represents the reactive power for fault recovery.

8. The dynamic reactive power compensation capacity configuration device for a new energy power transmission system according to claim 7, characterized in that, It includes a capacity allocation module and a verification module. The capacity allocation module is used to allocate the dynamic reactive power compensation capacity based on steady-state reactive power capacity and transient reactive power capacity. The verification module is used to verify the new energy power transmission system with the allocated dynamic reactive power compensation capacity according to power change conditions and transient fault conditions. The verification module includes a first information acquisition submodule, a second information acquisition submodule, and a verification adjustment submodule. The first information acquisition submodule is used to control the operation of the first system and the second system according to the power change and obtain the first voltage information, which includes a first voltage corresponding to the first system and a second voltage corresponding to the second system. The second information acquisition submodule is used to control the operation of the first system and the second system according to the transient fault condition and obtain the second voltage information, which includes a third voltage corresponding to the first system and a fourth voltage corresponding to the second system. The verification and adjustment submodule is used to adjust the dynamic reactive power compensation capacity of the new energy power transmission system according to the first voltage information or the second voltage information. Wherein, the first system is a new energy power transmission system that uses parallel capacitors for reactive power compensation, and the second system is a new energy power transmission system that has been allocated the dynamic reactive power compensation capacity for reactive power compensation; the power change condition refers to simulating the operation of the new energy power transmission system with power step increases of 0.9*Pmax and 0.08Pmax respectively on the power system simulation model; the transient fault condition refers to simulating the operation of the new energy power transmission system with a three-phase short-circuit fault on the power system simulation model; Pmax is the static stability limit power of the new energy power transmission system; The verification and adjustment submodule is further configured to: if both the first voltage and the second voltage are within the normal voltage range of their respective systems, then the dynamic reactive power compensation capacity of the second system is redundant, and the dynamic reactive power compensation capacity of the second system is reduced; if the first voltage is below the normal voltage range of the first system and the first system is in a voltage unstable state, and the second voltage is within the normal voltage range of the second system, then the dynamic reactive power compensation capacity of the second system meets the reactive power compensation requirements; if the second voltage is below the normal voltage range of the second system and the second system is in a voltage unstable state, then the dynamic reactive power compensation capacity of the second system is increased; if both the third voltage and the fourth voltage recover to the normal voltage of their respective systems, then the dynamic reactive power compensation capacity of the second system is redundant, and the dynamic reactive power compensation capacity of the second system is reduced; if the third voltage cannot recover to the normal voltage of the first system, and the fourth voltage recovers to the normal voltage of the second system, then the dynamic reactive power compensation capacity of the second system meets the reactive power compensation requirements; if the fourth voltage cannot recover to the normal voltage of the second system, then the dynamic reactive power compensation capacity of the second system is increased.

9. A terminal device, characterized in that, Including the processor and memory; The memory is used to store program code and transmit the program code to the processor; The processor is configured to execute the dynamic reactive power compensation capacity configuration method for the new energy power transmission system as described in any one of claims 1-6, according to the instructions in the program code.

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