Reactive power compensation equipment transient modeling method, device, equipment and readable storage medium

Abstract

The present application provides a method, apparatus, equipment and readable storage medium for transient modeling of reactive compensation equipment. The reactive compensation equipment can be connected to an AC power grid according to a preset circuit model. The controlled current source in the preset circuit model can be calculated through relevant parameters, thereby improving the numerical stability of the electromechanical transient simulation of the reactive compensation equipment. At the same time, the current output by the reactive compensation equipment at this time can be calculated according to the voltage reference value on the valve side of the reactive compensation equipment and the actual value of the control node voltage of the reactive compensation equipment, and the current output by the reactive compensation equipment can be judged and processed as being out of limit, ensuring that the switching device of the reactive compensation equipment does not over-current and does not cause damage to the reactive compensation equipment. The reactive compensation equipment can be effectively protected and the service life of the reactive compensation equipment can be increased.

Description

Technical Field

[0001] The present application relates to the field of direct current transmission technology, and in particular to a method, apparatus, device and readable storage medium for transient modeling of reactive compensation equipment. Background Art

[0002] A static synchronous compensator (STATCOM) is a dynamic reactive power compensation device based on a voltage source converter. It uses a self-commutated power semiconductor bridge converter to generate and absorb reactive power. The dynamic reactive power compensation device consists of an AC link and a DC link. The AC link, which is connected to the power system, first converts the system's AC power into DC through a converter and stores it in an energy storage device on the DC side. Simultaneously, the DC side voltage and current are converted to AC voltage and current through the converter and then transmitted to the power system.

[0003] Currently, static synchronous compensators (STATCOMs) are generally used in large AC power grids. By installing STATCOMs at selected sites, they regulate system voltage by emitting or absorbing reactive power, achieving voltage support. In large AC power grids, system voltage support is relatively strong, and STATCOMs only partially regulate system voltage. Modeling and simulation using pure current source injection offers good accuracy. However, if STATCOMs are used in large-scale renewable energy power generation bases without conventional power sources such as hydropower or thermal power, the AC power grid's voltage support capability is weak. Continuing to use the current source injection model can easily cause numerical oscillations in simulations. Simulation results indicate that STATCOMs fail to provide voltage support and instead easily cause system voltage oscillations. Therefore, the electromechanical transient simulation model of reactive power compensation equipment using current source injection is not suitable for simulating reactive power compensation equipment in large-scale renewable energy bases. Summary of the Invention

[0004] The present application aims to solve at least one of the above-mentioned technical defects. In view of this, the present application provides a transient modeling method, device, equipment and readable storage medium for reactive compensation equipment, which is used to solve the technical defect in the prior art that the existing electromechanical transient simulation model of reactive compensation equipment cannot be applied to simulation experiments of reactive compensation equipment in large-scale new energy base scenarios.

[0005] A transient modeling method for reactive power compensation equipment, comprising:

[0006] Connecting the target reactive power compensation device to the AC power grid according to a preset circuit model, wherein the preset circuit model includes a controlled current source;

[0007] Calculating an output current reference value of the target reactive power compensation device;

[0008] Calculating a voltage reference value on the valve side of the target reactive power compensation device according to an output current reference value of the target reactive power compensation device and a preset control node voltage reference value, wherein the preset control node voltage reference value is the control node voltage reference value of the target reactive power compensation device;

[0009] Calculating an actual output current value of the target reactive power compensation device according to a voltage reference value on the valve side of the target reactive power compensation device and an actual value of the control node voltage;

[0010] Determining whether an actual output current value of the target reactive power compensation device exceeds a preset first threshold;

[0011] If the actual output current value of the target reactive power compensation device exceeds the preset first threshold value, setting the actual output current value of the target reactive power compensation device to the preset first threshold value to obtain the actual output current value of the target reactive power compensation device that meets the limit requirement;

[0012] If the actual output current value of the target reactive power compensation device does not exceed the preset first threshold, the actual output current value of the target reactive power compensation device is used as the actual output current value of the target reactive power compensation device that meets the limit requirement;

[0013] Calculating a voltage reference value on the valve side of the target reactive power compensation device according to the actual output current value of the target reactive power compensation device that meets the limit requirement and the actual voltage value of the control node;

[0014] Calculating the current value of the controlled current source according to the voltage reference value of the valve side of the target reactive power compensation device;

[0015] The voltage of each node of the AC power grid is calculated according to the current value of the controlled current source.

[0016] Preferably, the method further comprises:

[0017] Determining whether an actual output current value of the target reactive power compensation device is less than or equal to a preset second threshold;

[0018] If the actual output current value of the target reactive compensation device is less than or equal to the preset second threshold, the actual output current value of the target reactive compensation device is set to the preset second threshold to obtain the actual output current value of the target reactive compensation device that meets the limiting requirement.

[0019] Preferably, a calculation formula for calculating the valve-side voltage reference value of the target reactive power compensation device according to the output current reference value of the target reactive power compensation device and a preset control node voltage reference value includes:

[0020] Uref ∠θ=U sref ∠θ+(I sref *X)∠θ

[0021] U ref Indicates the voltage reference value on the valve side of the target reactive power compensation device;

[0022] θ represents the actual value of the phase angle of the control node voltage of the target reactive power compensation device;

[0023] U sref Indicates the control node voltage reference value of the target reactive power compensation device;

[0024] I sref Indicates the output current reference value of the target reactive power compensation equipment;

[0025] X represents the reactance of the grid-connected transformer.

[0026] Preferably, a calculation formula for calculating the actual output current value of the target reactive power compensation device according to the voltage reference value of the valve side of the target reactive power compensation device and the actual value of the control node voltage includes:

[0027]

[0028] I s Indicates the actual output current value of the target reactive power compensation device;

[0029] U ref Indicates the actual voltage value of the target reactive power compensation device control node;

[0030] U s Indicates the actual voltage value of the target reactive power compensation device control node;

[0031] X represents the reactance of the grid-connected transformer.

[0032] Preferably, the preset first threshold is set with reference to the maximum current limit value of the switching device of the target reactive power compensation equipment;

[0033] The preset second threshold is set with reference to the minimum current limit value of the switching component of the target reactive power compensation device.

[0034] Preferably, a calculation formula for calculating the voltage reference value on the valve side of the target reactive power compensation device according to the actual output current value of the target reactive power compensation device that meets the limit requirement and the actual value of the control node voltage includes:

[0035] U' ref ∠θ=U s ∠θ+(I s *X)∠θ

[0036] in,

[0037] U' ref Indicates the voltage reference value of the valve side of the target reactive power compensation device after correction;

[0038] θ represents the actual value of the phase angle of the control node voltage of the target reactive power compensation device;

[0039] U s Indicates the actual value of the control node voltage of the target reactive power compensation device;

[0040] I s Indicates the actual current value output by the target reactive power compensation device;

[0041] X represents the reactance of the grid-connected transformer.

[0042] Preferably, the calculation formula for calculating the current value of the controlled current source according to the voltage reference value of the valve side of the target reactive power compensation device includes:

[0043]

[0044] in,

[0045] I qeq Indicates the current value of the controlled current source;

[0046] U' ref Indicates the voltage reference value of the valve side of the target reactive power compensation device after correction;

[0047] X represents the reactance of the grid-connected transformer.

[0048] A transient modeling device for reactive power compensation equipment, comprising:

[0049] a connecting unit, configured to connect a target reactive power compensation device to an AC power grid according to a preset circuit model, wherein the preset circuit model includes a controlled current source;

[0050] A first calculation unit, configured to calculate an output current reference value of the target reactive power compensation device;

[0051] a second calculation unit, configured to calculate a valve-side voltage reference value of the target reactive power compensation device according to an output current reference value of the target reactive power compensation device and a preset control node voltage reference value, wherein the preset control node voltage reference value is the control node voltage reference value of the target reactive power compensation device;

[0052] a third calculation unit, configured to calculate an actual output current value of the target reactive power compensation device according to a voltage reference value on a valve side of the target reactive power compensation device and an actual value of the control node voltage;

[0053] A first judging unit, configured to judge whether an actual output current value of the target reactive power compensation device exceeds a preset first threshold;

[0054] a fourth calculating unit, configured to, when the execution result of the first judging unit determines that the actual output current value of the target reactive power compensation device exceeds the preset threshold, set the actual output current value of the target reactive power compensation device to the preset first threshold value, so as to obtain the actual output current value of the target reactive power compensation device that meets the limit requirement;

[0055] a fifth calculating unit, configured to, when the execution result of the first judging unit determines that the actual output current value of the target reactive power compensation device does not exceed the preset threshold, use the actual output current value of the target reactive power compensation device as the actual output current value of the target reactive power compensation device that meets the limit requirement;

[0056] a sixth calculation unit, configured to calculate a voltage reference value on the valve side of the target reactive power compensation device according to the actual output current value of the target reactive power compensation device that meets the limit requirement and the actual value of the control node voltage;

[0057] a seventh calculation unit, configured to calculate a current value of the controlled current source according to a voltage reference value of a valve side of the target reactive power compensation device;

[0058] An eighth calculation unit is configured to calculate the voltage of each node of the AC power grid according to the current value of the controlled current source.

[0059] A reactive compensation equipment transient modeling device includes: one or more processors, and a memory;

[0060] The memory stores computer-readable instructions, and when the computer-readable instructions are executed by the one or more processors, the steps of the transient modeling method for reactive compensation equipment as described in any one of the above introductions are implemented.

[0061] A readable storage medium stores computer-readable instructions, which, when executed by one or more processors, enable the one or more processors to implement the steps of the transient modeling method for reactive compensation equipment as described in any of the above introductions.

[0062] It can be seen from the technical solutions introduced above that when it is necessary to conduct modeling and simulation research on the application of reactive compensation equipment in large-scale new energy base scenarios, the method provided in the embodiment of the present application can connect the target reactive compensation equipment to the AC power grid according to a preset circuit model, wherein the preset circuit model includes a controlled current source; the preset circuit model is used to connect the target reactive compensation equipment to the AC power grid according to the preset circuit model, and the current value of the controlled current source can be determined by calculating relevant parameters, which can effectively improve the numerical stability of the electromechanical transient simulation of the reactive compensation equipment. After the target reactive compensation device is connected to the AC power grid, the output current reference value of the target reactive compensation device can be calculated; after determining the output current reference value of the target reactive compensation device, the voltage reference value of the valve side of the target reactive compensation device can be further calculated based on the output current reference value of the target reactive compensation device and the preset control node voltage reference value, wherein the preset control node voltage reference value is the control node voltage reference value of the target reactive compensation device; in the process of calculating the voltage reference value of the valve side of the target reactive compensation device based on the output current reference value of the target reactive compensation device and the preset control node voltage reference value, only the output reactive current of the target reactive compensation device is considered, which can ensure that the voltage phase angle value of the valve side of the target reactive compensation device is the same as the control node voltage phase angle of the reactive compensation device.

[0063] At the same time, the actual output current value of the target reactive compensation device can also be calculated based on the voltage reference value on the valve side of the target reactive compensation device and the actual value of the control node voltage; since the switching device of the target reactive compensation device has a current limit value, if the actual output current value of the target reactive compensation device exceeds the current limit value of the switching device of the target reactive compensation device, it may cause damage to the switching device of the target reactive compensation device. Therefore, after determining the actual output current value of the target reactive compensation device, it can be further judged whether the actual output current value of the target reactive compensation device exceeds the preset first threshold value; if the actual output current value of the target reactive compensation device exceeds the preset first threshold value, the actual output current value of the target reactive compensation device can be set to the preset first threshold value, thereby obtaining the value that meets the limit value. the actual output current value of the target reactive compensation device that meets the amplitude limiting requirement; if the actual output current value of the target reactive compensation device does not exceed the preset first threshold value, the actual output current value of the target reactive compensation device can be used as the actual output current value of the target reactive compensation device that meets the amplitude limiting requirement; after determining the actual output current value of the target reactive compensation device that meets the amplitude limiting requirement, the voltage reference value of the valve side of the target reactive compensation device can be further calculated based on the actual output current value of the target reactive compensation device that meets the amplitude limiting requirement and the actual value of the control node voltage; and then the current value of the controlled current source is calculated based on the voltage reference value of the valve side of the target reactive compensation device. After determining the current value of the controlled current source, the voltage of each node of the AC power grid can be calculated based on the current value of the controlled current source.

[0064] The method provided in the embodiment of the present application can connect the reactive compensation equipment to the AC power grid according to a preset circuit model, and the controlled current source in the preset circuit model can be calculated through relevant parameters, thereby improving the numerical stability of the electromechanical transient simulation of the reactive compensation equipment. At the same time, the current output by the reactive compensation equipment at this time can be calculated based on the voltage reference value on the valve side of the reactive compensation equipment and the actual value of the control node voltage of the reactive compensation equipment, and the current output by the reactive compensation equipment can be judged and processed as being out of limit, ensuring that the switching devices of the reactive compensation equipment do not over-current and will not cause damage to the reactive compensation equipment. The reactive compensation equipment can be effectively protected and the service life of the reactive compensation equipment can be increased. At the same time, the voltage of each node of the AC power grid can be calculated based on the current value of the controlled current source, thereby ensuring the stability of the voltage of each node of the AC power grid. BRIEF DESCRIPTION OF THE DRAWINGS

[0065] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0066] Figure 1 This is a flow chart of a method for implementing transient modeling of reactive compensation equipment according to an embodiment of the present application;

[0067] Figure 2 A schematic diagram of a reactive power compensation device connected to an AC power grid via a dedicated transformer according to an embodiment of the present application;

[0068] Figure 3 This is a schematic diagram of a connection of a reactive power compensation device as a current source connected to an AC power grid according to an embodiment of the present application;

[0069] Figure 4 A schematic diagram showing the principle of a current source calculation model for a reactive power compensation device according to an embodiment of the present application;

[0070] Figure 5 This is a schematic structural diagram of a transient modeling device for reactive compensation equipment according to an embodiment of the present application;

[0071] Figure 6 This is a hardware structure block diagram of a transient modeling device for reactive compensation equipment disclosed in an embodiment of the present application. DETAILED DESCRIPTION

[0072] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0073] In practical applications, a static synchronous compensator (STATCOM) is a dynamic reactive power compensation device based on a voltage source converter (VSC). It uses a self-commutated power semiconductor bridge converter to generate and absorb reactive power. A dynamic reactive power compensation device generally consists of an AC link and a DC link. The AC link, connected to the power system, first converts the system's AC power into DC through a converter and stores it in an energy storage device on the DC side. Simultaneously, the DC side voltage and current are converted to AC voltage and current through the converter and then transmitted to the power system.

[0074] In view of the fact that most of the current transient modeling schemes for reactive compensation equipment are difficult to adapt to complex and changeable business needs, the applicant has studied a transient modeling scheme for reactive compensation equipment. This scheme can connect the reactive compensation equipment to the AC power grid according to a preset circuit model, and the controlled current source in the preset circuit model can be calculated through relevant parameters, thereby improving the numerical stability of the electromechanical transient simulation of the reactive compensation equipment. At the same time, the current output by the reactive compensation equipment at this time can be calculated based on the voltage reference value on the valve side of the reactive compensation equipment and the actual value of the control node voltage of the reactive compensation equipment, and the current output by the reactive compensation equipment can be judged and processed if it exceeds the limit, ensuring that the switching devices of the reactive compensation equipment do not over-current and will not cause damage to the reactive compensation equipment. It can effectively protect the reactive compensation equipment and improve the service life of the reactive compensation equipment. At the same time, the voltage of each node of the AC power grid can be calculated based on the current value of the controlled current source, thereby ensuring the stability of the voltage of each node of the AC power grid.

[0075] The methods provided in the embodiments of the present application can be used in a variety of general-purpose or specialized computing device environments or configurations, such as personal computers, server computers, handheld or portable devices, tablet devices, multi-processor devices, and distributed computing environments including any of the above.

[0076] An embodiment of the present application provides a transient modeling method for reactive compensation equipment. The method can be applied to various simulation systems and can also be applied to various computer terminals or smart terminals. The execution subject can be a processor or server of the computer terminal or smart terminal.

[0077] The following combination Figure 1 、 Figure 2 、 Figure 3 and Figure 4 , introduces the process of the transient modeling method of reactive compensation equipment given in the embodiment of the present application, as follows Figure 1 As shown, the process can include the following steps:

[0078] Step S101 : connecting a target reactive power compensation device to an AC power grid according to a preset circuit model, wherein the preset circuit model includes a controlled current source.

[0079] Specifically, in actual application, the dynamic reactive power compensation device can use a transformer to generate and absorb reactive power.

[0080] Reactive power compensation equipment is generally connected to the power grid through a dedicated transformer. The connection form is as follows: Figure 2 shown. Figure 2 A schematic diagram illustrating the connection of a reactive power compensation device to an AC power grid via a dedicated transformer is provided.

[0081] Figure 2 middle,

[0082] R can represent the resistance of the grid-connected transformer of the reactive compensation equipment;

[0083] X can represent the reactance of the grid-connected transformer of the reactive compensation equipment;

[0084] Q can represent the reactive power output by the reactive compensation equipment;

[0085] The AC power supply on the right is the system equivalent power supply.

[0086] The function of reactive power compensation equipment is to provide dynamic reactive power support for the connected system, and to achieve reactive power regulation by adjusting the reactive current output by the reactive power compensation equipment.

[0087] In the electromechanical transient simulation of reactive power compensation equipment, the reactive power compensation equipment is generally treated as a current source model, which is as follows Figure 3 shown.

[0088] Figure 3 This diagram illustrates a connection diagram of a reactive power compensation device as a current source connected to an AC power grid.

[0089] Figure 3 middle,

[0090] I can represent the injected current phasor of the current source;

[0091] I q It can represent the output current value of the reactive power compensation equipment.

[0092] Since the reactive power compensation device only outputs reactive power, the current phase angle output by the reactive power compensation device is 90 degrees different from the voltage phase angle, and the current output by the reactive power compensation device only has a q-axis component.

[0093] Therefore, when it is necessary to conduct modeling and simulation research on the application of reactive compensation equipment in large-scale new energy base scenarios, the target reactive compensation equipment can be connected to the AC power grid according to a preset circuit model, so that the relevant parameters of the reactive compensation equipment can be set according to the relevant parameters of the AC power grid.

[0094] The preset circuit model may include a controlled current source.

[0095] The reactive power compensation device may be connected to the AC power grid by adopting an equivalent circuit model.

[0096] Wherein, the equivalent circuit model may include a controlled current source;

[0097] The reactive power compensation device can be simulated into an equivalent circuit, and the equivalent circuit can be connected to the AC power grid. The equivalent circuit includes a controlled current source, and the current of the controlled current source can be set with reference to the voltage reference value on the valve side of the target reactive power compensation device.

[0098] For example, the reactive power compensation device may be connected to the AC power grid using a Norton equivalent circuit or a Thevenin equivalent circuit.

[0099] The Norton equivalent circuit or the Thevenin equivalent circuit may include a controlled current source.

[0100] The essence of the Norton equivalent circuit is to equate the two-terminal network to a generator with internal resistance. That is, any two-terminal network can be represented by a generator with internal resistance after equivalent transformation, which is equivalent to the calculation of physical quantities outside the two-terminal network.

[0101] For the Norton equivalent circuit, the network at both ends is equivalent to a controllable current source in parallel with an internal resistor; the calculation of the voltage and current of the external circuit is completely equivalent.

[0102] It's worth noting that the equivalent circuit refers to the equivalence outside the network, not within it. Secondly, short-circuiting or disconnecting the external load simplifies the structure of the equivalent circuit, and thus the calculation. Therefore, using the Norton equivalent circuit to connect the flexible DC transmission system to the AC grid simplifies the calculation of parameters related to the reactive power compensation device and the AC grid.

[0103] In addition, since the equivalent circuit is generally composed of a controlled current source and a reactance in parallel, the reactance can be the reactance of the grid-connected transformer, and the controlled current source can be obtained through calculation, it can help improve the numerical stability of the electromechanical transient simulation of the reactive compensation equipment.

[0104] Step S102: Calculate an output current reference value of the target reactive power compensation device.

[0105] Specifically, from the above introduction, it can be seen that when it is necessary to conduct modeling and simulation research on the application of reactive compensation equipment in large-scale new energy base scenarios, the method provided in the embodiment of the present application can connect the target reactive compensation equipment to the AC power grid according to a preset circuit model, wherein the preset circuit model includes a controlled current source. After the target reactive compensation equipment is connected to the AC power grid according to the preset circuit model, it is necessary to set the relevant parameters of the reactive compensation equipment, thereby allowing the relevant parameters of the reactive compensation equipment to be set according to the relevant parameters of the AC power grid.

[0106] For example, an output current reference value of the target reactive power compensation device may be calculated, so that relevant parameters of the target reactive power compensation device may be set according to the output current reference value of the target reactive power compensation device.

[0107] From the above introduction, it can be seen that the method provided in the embodiment of the present application can connect the target reactive compensation device to the AC power grid according to a preset circuit model. In the preset circuit model, the control target of the target reactive compensation device is to keep the voltage amplitude of the control node constant. Therefore, in the process of calculating the output current reference value of the target reactive compensation device, the deviation between the control node voltage reference value of the target reactive compensation device and the actual value of the control node voltage of the target reactive compensation device can be used as an input signal, thereby obtaining the output current reference value of the target reactive compensation device.

[0108] For example, you can refer to Figure 4 The output current reference value of the target reactive compensation device is calculated by using the principle diagram of the current source calculation model of the reactive compensation device shown.

[0109] The input of the calculation model is the difference between the target value and the actual value of the control node voltage of the reactive compensation device. The obtained difference is calculated through the lead-lag link, PI controller, limit link and feedback link to obtain the output current reference value of the reactive compensation device.

[0110] like Figure 4 As shown:

[0111] V can represent the actual value of the control node voltage of the reactive compensation device;

[0112] V ref It can represent the target voltage value of the control node of the reactive compensation equipment;

[0113] T1 can represent the voltage measurement time constant;

[0114] T2, T3, T4, and T5 can represent the time constants of the lead-lag links;

[0115] K p It can express the proportional coefficient of the proportional link;

[0116] T p It can represent the integral time constant of the proportional link;

[0117] K i It can represent the proportional coefficient of the integral link;

[0118] Max and Min can represent the maximum and minimum values ​​of the control signal;

[0119] T s is the output delay time constant;

[0120] K D is the proportional coefficient of the feedback link.

[0121] Determining the output current reference value of the target reactive power compensation device can help calculate the valve-side voltage reference value of the target reactive power compensation device based on the output current reference value of the target reactive power compensation device and a preset control node voltage reference value.

[0122] Step S103, calculating the voltage reference value of the valve side of the target reactive compensation device based on the output current reference value of the target reactive compensation device and the preset control node voltage reference value, wherein the preset control node voltage reference value is the control node voltage reference value of the target reactive compensation device.

[0123] Specifically, from the above introduction, it can be seen that the method provided in the embodiment of the present application can determine the output current reference value of the target reactive compensation device. After determining the output current reference value of the target reactive compensation device, the voltage reference value of the valve side of the target reactive compensation device can be calculated based on the output current reference value of the target reactive compensation device and the preset control node voltage reference value.

[0124] The preset control node voltage reference value may be a control node voltage reference value of the target reactive power compensation device.

[0125] In actual application, since the reactive compensation device generally only outputs reactive current, it can be determined that the current phase angle of the reactive compensation device is 90 degrees different from the voltage phase angle. Therefore, it can be determined that the phase angle of the voltage on the valve side of the reactive compensation device is the same as the phase angle of the control node voltage of the reactive compensation device.

[0126] The calculation formula for calculating the valve-side voltage reference value of the target reactive power compensation device according to the output current reference value of the target reactive power compensation device and the preset control node voltage reference value may include the following:

[0127] U ref ∠θ=U sref ∠θ+(I sref *X)∠θ

[0128] U ref It can represent the voltage reference value on the valve side of the target reactive power compensation equipment;

[0129] θ can represent the actual value of the phase angle of the control node voltage of the target reactive power compensation device;

[0130] U sref It can represent the control node voltage reference value of the target reactive power compensation device;

[0131] I sref It can represent the output current reference value of the target reactive power compensation equipment;

[0132] X can represent the reactance of the grid-connected transformer.

[0133] From the above analysis, it can be seen that when the output current reference value of the target reactive compensation device is positive, the voltage amplitude on the valve side of the target reactive compensation device is greater than the voltage amplitude of the control node of the target reactive compensation device. At this time, the target reactive compensation device can emit reactive power. Conversely, when the output current reference value of the target reactive compensation device is negative, the voltage amplitude on the valve side of the target reactive compensation device is less than the voltage amplitude of the control node of the target reactive compensation device. At this time, the target reactive compensation device can absorb reactive power.

[0134] Step S104 : calculating the actual output current value of the target reactive power compensation device according to the voltage reference value at the valve side of the target reactive power compensation device and the actual value of the control node voltage.

[0135] Specifically, after the target reactive power compensation device is connected to the AC power grid, in addition to determining the voltage reference value on the valve side of the target reactive power compensation device, the actual output current value of the target reactive power compensation device also needs to be determined.

[0136] Therefore, while determining the voltage reference value on the valve side of the target reactive power compensation device, the actual output current value of the target reactive power compensation device can also be further calculated.

[0137] From the above Figure 4 As can be seen from the schematic diagram of the calculation model principle, the actual value of the output current of the target reactive power compensation device is related to the control node voltage reference value of the target reactive power compensation device and the actual value of the control node voltage.

[0138] Therefore, the actual value of the output current of the target reactive power compensation device can be calculated according to the voltage reference value on the valve side of the target reactive power compensation device and the actual value of the control node voltage.

[0139] The calculation formula for calculating the actual output current value of the target reactive power compensation device according to the voltage reference value of the valve side of the target reactive power compensation device and the actual value of the control node voltage may include the following:

[0140]

[0141] I s It can indicate the actual output current value of the target reactive power compensation equipment;

[0142] U refIt can represent the actual voltage value of the target reactive power compensation device control node;

[0143] U s It can represent the actual voltage value of the control node of the target reactive power compensation device;

[0144] X can represent the reactance of the grid-connected transformer.

[0145] Determining the actual output current value of the target reactive power compensation device helps to judge whether overcurrent damage will be caused to the switching device of the reactive power compensation device based on the actual output current value of the target reactive power compensation device.

[0146] Step S105 , determining whether the actual output current value of the target reactive power compensation device exceeds a preset first threshold.

[0147] Specifically, it can be seen from the above introduction that the method provided in the embodiment of the present application can determine the actual value of the output current of the target reactive power compensation device.

[0148] In actual application, since the current of the switching device of the reactive compensation equipment has a maximum limit, the actual value of the output current of the target reactive compensation equipment has a maximum limit. If the actual value of the output current of the target reactive compensation equipment exceeds the maximum limit, the switching device of the target reactive compensation equipment may be damaged.

[0149] Therefore, after determining the actual output current value of the target reactive power compensation device, it is necessary to perform a limit-exceeding judgment on the actual output current value of the target reactive power compensation device.

[0150] Therefore, after determining the actual output current value of the target reactive power compensation device, it can be determined whether the actual output current value of the target reactive power compensation device exceeds a preset first threshold.

[0151] The preset first threshold may be set with reference to the maximum value of the current of the switching device of the target reactive power compensation device.

[0152] For example, the preset first threshold may be set to the maximum value of the current of the switching device of the target reactive power compensation device.

[0153] If the actual output current value of the target reactive compensation device exceeds the maximum current value of the switching device of the target reactive compensation device, it means that the actual output current value of the target reactive compensation device may cause damage to the switching components of the target reactive compensation device, and the actual output current value of the target reactive compensation device needs to be reset.

[0154] Therefore, if the actual output current value of the target reactive power compensation device exceeds the preset first threshold, step S106 may be executed.

[0155] If the actual value of the output current of the target reactive compensation device does not exceed the maximum value of the current of the switching device of the target reactive compensation device, it means that the actual value of the output current of the target reactive compensation device will not cause damage to the switching components of the target reactive compensation device, and there is no need to reset the actual value of the output current of the target reactive compensation device.

[0156] Therefore, if the actual output current value of the target reactive power compensation device does not exceed the preset first threshold, step S107 may be executed.

[0157] By judging whether the actual value of the output current of the target reactive compensation device exceeds the limit, it can maximize the guarantee that the actual value of the output current of the target reactive compensation device will not cause overcurrent damage to the switching components of the target reactive compensation device, and can also effectively improve the numerical stability of the electromechanical transient simulation of the reactive compensation device.

[0158] Step S106 : setting the actual output current value of the target reactive power compensation device to the preset first threshold value, and obtaining the actual output current value of the target reactive power compensation device that meets the limit requirement.

[0159] Specifically, it can be seen from the above introduction that the method provided in the embodiment of the present application can determine whether the actual value of the output current of the target reactive power compensation device exceeds a preset threshold.

[0160] Therefore, if the actual output current value of the target reactive compensation device exceeds the preset threshold value, it means that the actual output current value of the target reactive compensation device exceeds the maximum current of the switching device of the target reactive compensation device. The actual output current value of the target reactive compensation device may cause damage to the switching components of the target reactive compensation device, and the actual output current value of the target reactive compensation device needs to be reset. The actual output current value of the target reactive compensation device can be set to the preset first threshold value to obtain the actual output current value of the target reactive compensation device that meets the limiting requirements.

[0161] Step S107 : Using the actual output current value of the target reactive power compensation device as the actual output current value of the target reactive power compensation device that meets the amplitude limiting requirement.

[0162] Specifically, it can be seen from the above introduction that the method provided in the embodiment of the present application can determine whether the actual value of the output current of the target reactive power compensation device exceeds a preset threshold.

[0163] Therefore, if the actual output current value of the target reactive compensation device does not exceed the preset threshold value, it means that the actual output current value of the target reactive compensation device does not exceed the maximum current of the switching device of the target reactive compensation device, then the actual output current value of the target reactive compensation device will not cause damage to the switching components of the target reactive compensation device, and there is no need to reset the actual output current value of the target reactive compensation device. The actual output current value of the target reactive compensation device can be used as the actual output current value of the target reactive compensation device that meets the limiting requirements.

[0164] Step S108 : calculating a valve-side voltage reference value of the target reactive power compensation device according to the actual output current value of the target reactive power compensation device that meets the amplitude limiting requirement and the actual voltage value of the control node.

[0165] Specifically, as can be seen from the above description, the method provided in the embodiment of the present application can group the actual output current value of the target reactive power compensation device that meets the limit requirement. The actual output current value of the target reactive power compensation device that meets the limit requirement will not cause overcurrent damage to the switching components of the target reactive power compensation device.

[0166] The voltage reference value on the valve side of the target reactive compensation device can be set with reference to the actual output current value of the target reactive compensation device that meets the limiting requirements and the actual value of the control node voltage. Therefore, after determining the actual output current value of the target reactive compensation device that meets the limiting requirements, the voltage reference value on the valve side of the target reactive compensation device can be calculated based on the actual output current value of the target reactive compensation device that meets the limiting requirements and the actual value of the control node voltage.

[0167] The calculation formula for calculating the voltage reference value on the valve side of the target reactive power compensation device according to the actual output current value of the target reactive power compensation device that meets the limit requirement and the actual value of the control node voltage may include the following:

[0168] U' ref ∠θ=U s ∠θ+(I s *X)∠θ

[0169] in,

[0170] U' ref It can represent the voltage reference value of the valve side of the target reactive power compensation device after correction;

[0171] θ can represent the actual value of the phase angle of the control node voltage of the target reactive power compensation device;

[0172] U sIt can represent the actual value of the control node voltage of the target reactive power compensation device;

[0173] I s It can indicate the actual current value output by the target reactive power compensation equipment;

[0174] X can represent the reactance of the grid-connected transformer.

[0175] The voltage reference value on the valve side of the target reactive compensation device is determined to meet the device requirement of the target reactive compensation device based on the actual output current value of the target reactive compensation device that meets the limit requirement.

[0176] Step S109 : calculating the current value of the controlled current source according to the voltage reference value of the valve side of the target reactive power compensation device.

[0177] Specifically, as can be seen from the above description, the method provided in the embodiment of the present application can determine the voltage reference value of the valve side of the target reactive power compensation device. The target reactive power compensation device is connected to the AC power grid in the form of an equivalent circuit, such as Figure 3 As shown, the equivalent circuit generally includes a controlled current source.

[0178] The current of the controlled current source can be set with reference to the voltage reference value on the valve side of the target reactive compensation device. Therefore, after determining the voltage reference value on the valve side of the target reactive compensation device, the current value of the controlled current source can be calculated based on the voltage reference value on the valve side of the target reactive compensation device.

[0179] The calculation formula for calculating the current value of the controlled current source according to the voltage reference value of the valve side of the target reactive power compensation device may include the following:

[0180]

[0181] in,

[0182] I qeq Can represent the current value of the controlled current source;

[0183] U' ref It can represent the voltage reference value of the valve side of the target reactive power compensation device after correction;

[0184] X can represent the reactance of the grid-connected transformer.

[0185] Step S110 : calculating the voltage of each node of the AC power grid according to the current value of the controlled current source.

[0186] Specifically, in actual application, the target reactive power compensation device is connected to the AC power grid according to the preset circuit model.

[0187] Therefore, after determining the current value of the controlled current source, the method provided in the embodiment of the present application can also calculate the voltages at various nodes of the AC power grid based on the current value of the controlled current source. The current value of the controlled current source can be obtained by calculation. Therefore, using the current value of the controlled current source to calculate the voltages at various nodes of the AC power grid can effectively improve the numerical stability of transient modeling of reactive power compensation equipment.

[0188] From the technical solution introduced above, it can be seen that when it is necessary to conduct simulation experiments on the application of reactive compensation equipment in large-scale new energy base scenarios, the method provided in the embodiment of the present application can connect the reactive compensation equipment to the AC power grid according to a preset circuit model, and the controlled current source in the preset circuit model can be calculated through relevant parameters, thereby improving the numerical stability of the electromechanical transient simulation of the reactive compensation equipment. At the same time, the current output by the reactive compensation equipment at this time can be calculated based on the voltage reference value on the valve side of the reactive compensation equipment and the actual value of the control node voltage of the reactive compensation equipment, and the current output by the reactive compensation equipment can be judged and processed to ensure that the switching devices of the reactive compensation equipment do not over-current and will not cause damage to the reactive compensation equipment. The reactive compensation equipment can be effectively protected and the service life of the reactive compensation equipment can be improved. At the same time, the voltage of each node of the AC power grid can be calculated based on the current value of the controlled current source, thereby ensuring the stability of the voltage of each node of the AC power grid.

[0189] Furthermore, in actual application, when the actual output current value of the target reactive power compensation device is less than or equal to the minimum output current limit value of the target reactive power compensation device, the processing procedure for obtaining the actual output current value of the target reactive power compensation device that meets the limit condition will be different. The following describes the process, which may include the following steps:

[0190] Step S201: Determine whether the actual output current value of the target reactive power compensation device is less than or equal to a preset second threshold.

[0191] Specifically, in actual application, the actual output current value of the target reactive power compensation device may be less than or equal to the minimum output current limit value of the target reactive power compensation device.

[0192] When the actual output current value of the target reactive compensation device is less than or equal to the minimum output current limit value of the target reactive compensation device, the actual output current value of the target reactive compensation device may damage the target reactive compensation device. Therefore, it is necessary to determine whether the target reactive compensation device is less than or equal to the minimum output current limit value of the target reactive compensation device.

[0193] Therefore, after determining the actual output current value of the target reactive power compensation device, it is necessary to further determine whether the actual output current value of the target reactive power compensation device is less than or equal to a preset second threshold.

[0194] The preset second threshold value may be set with reference to a minimum output current limit value of the target reactive power compensation device.

[0195] For example, the preset second threshold value may be set to a minimum output current limit value of the target reactive power compensation device.

[0196] If it is determined that the actual output current value of the target reactive compensation device is less than or equal to the preset second threshold, it means that the actual output current value of the target reactive compensation device may cause damage to the target reactive compensation device. Therefore, the actual output current value of the target reactive compensation device needs to be set, so that step S202 can be executed.

[0197] Step S202 : setting the actual output current value of the target reactive power compensation device to the preset second threshold value, and obtaining the actual output current value of the target reactive power compensation device that meets the limit requirement.

[0198] Specifically, in actual application, the maximum limit value of the output current of the reactive compensation device is generally set to a positive number, while the minimum limit value of the output current of the reactive compensation device is generally set to a negative number. The existence of maximum and minimum limit values ​​for the output current of the reactive compensation device indicates that the output current of the reactive compensation device cannot be less than or equal to the minimum limit value, nor can it exceed the maximum limit value. If the output current of the reactive compensation device is less than or equal to the minimum limit value, or exceeds the maximum limit value, it may cause overcurrent damage to the reactive compensation device.

[0199] Therefore, when it is determined that the actual value of the output current of the target reactive compensation device is less than or equal to the preset second threshold, it means that the actual value of the output current of the target reactive compensation device may cause damage to the target reactive compensation device. Therefore, it is necessary to set the actual value of the output current of the target reactive compensation device. The actual value of the output current of the target reactive compensation device can be set to the preset second threshold to obtain the actual value of the output current of the target reactive compensation device that meets the limiting requirements.

[0200] It can be seen from the technical solution introduced above that when determining whether the actual value of the output current of the target reactive compensation device is less than or equal to the minimum limit value of the output current of the target reactive compensation device, the method provided in the embodiment of the present application can set the actual value of the output current of the target reactive compensation device to the minimum limit value of the output current of the target reactive compensation device, thereby obtaining the actual value of the output current of the target reactive compensation device that meets the limiting requirements.

[0201] The following describes a transient modeling device for reactive compensation equipment provided in an embodiment of the present application. The transient modeling device for reactive compensation equipment described below and the transient modeling method for reactive compensation equipment described above can be referred to in correspondence with each other.

[0202] See also Figure 5 , Figure 5 This is a schematic structural diagram of a transient modeling device for reactive compensation equipment disclosed in an embodiment of the present application.

[0203] like Figure 5 As shown, the reactive compensation equipment transient modeling device may include:

[0204] A connecting unit 101 is configured to connect a target reactive power compensation device to an AC power grid according to a preset circuit model, wherein the preset circuit model includes a controlled current source;

[0205] A first calculation unit 102 is configured to calculate an output current reference value of the target reactive power compensation device;

[0206] a second calculating unit 103, configured to calculate a valve-side voltage reference value of the target reactive power compensation device according to an output current reference value of the target reactive power compensation device and a preset control node voltage reference value, wherein the preset control node voltage reference value is the control node voltage reference value of the target reactive power compensation device;

[0207] A third calculation unit 104 is configured to calculate an actual output current value of the target reactive power compensation device according to a voltage reference value at a valve side of the target reactive power compensation device and an actual value of the control node voltage;

[0208] The first judging unit 105 is configured to judge whether the actual output current value of the target reactive power compensation device exceeds a preset first threshold;

[0209] a fourth calculating unit 106 configured to, when the execution result of the first determining unit 105 determines that the actual output current value of the target reactive power compensation device exceeds the preset threshold, set the actual output current value of the target reactive power compensation device to the preset first threshold value, thereby obtaining the actual output current value of the target reactive power compensation device that meets the limit requirement;

[0210] a fifth calculating unit 107, configured to, when the execution result of the first determining unit 105 determines that the actual output current value of the target reactive power compensation device does not exceed the preset threshold, use the actual output current value of the target reactive power compensation device as the actual output current value of the target reactive power compensation device that meets the limit requirement;

[0211] a sixth calculation unit 108, configured to calculate a valve-side voltage reference value of the target reactive power compensation device according to the actual output current value of the target reactive power compensation device that meets the limit requirement and the actual value of the control node voltage;

[0212] The seventh calculation unit 109 is configured to calculate the current value of the controlled current source according to the voltage reference value of the valve side of the target reactive power compensation device.

[0213] The eighth calculation unit 110 is configured to calculate the voltage of each node of the AC power grid according to the current value of the controlled current source.

[0214] It can be seen from the technical solution introduced above that when it is necessary to conduct modeling and simulation research on the application of reactive compensation equipment in large-scale new energy base scenarios, the device provided in the embodiment of the present application can use the connection unit 101 to connect the target reactive compensation equipment to the AC power grid according to a preset circuit model, wherein the preset circuit model includes a controlled current source; the preset circuit model is used to connect the target reactive compensation equipment to the AC power grid according to the preset circuit model, and the current value of the controlled current source can be determined by calculating relevant parameters, which can effectively improve the numerical stability of the electromechanical transient simulation of the reactive compensation equipment. After the target reactive compensation device is connected to the AC power grid, the first calculation unit 102 can be used to calculate the output current reference value of the target reactive compensation device; after determining the output current reference value of the target reactive compensation device, the second calculation unit 103 can be further used to calculate the voltage reference value of the valve side of the target reactive compensation device based on the output current reference value of the target reactive compensation device and the preset control node voltage reference value, wherein the preset control node voltage reference value is the control node voltage reference value of the target reactive compensation device; in the process of calculating the voltage reference value of the valve side of the target reactive compensation device based on the output current reference value of the target reactive compensation device and the preset control node voltage reference value, only the output reactive current of the target reactive compensation device is considered, which can ensure that the voltage phase angle value of the valve side of the target reactive compensation device is the same as the control node voltage phase angle of the reactive compensation device.

[0215] At the same time, the third calculation unit 104 can also be used to calculate the actual value of the output current of the target reactive compensation device based on the voltage reference value on the valve side of the target reactive compensation device and the actual value of the control node voltage; since the switching device of the target reactive compensation device has a current limit value, if the actual value of the output current of the target reactive compensation device exceeds the current limit value of the switching device of the target reactive compensation device, it may cause damage to the switching device of the target reactive compensation device. Therefore, after determining the actual value of the output current of the target reactive compensation device, the first judgment unit 105 can be further used to judge whether the actual value of the output current of the target reactive compensation device exceeds the preset first threshold; if the actual value of the output current of the target reactive compensation device exceeds the preset first threshold, the fourth calculation unit 106 can be used to set the actual value of the output current of the target reactive compensation device to the preset first threshold, thereby obtaining the actual value that meets the limiting requirement. The actual output current value of the target reactive compensation device; if the actual output current value of the target reactive compensation device does not exceed the preset first threshold value, the fifth calculation unit 107 can be used to take the actual output current value of the target reactive compensation device as the actual output current value of the target reactive compensation device that meets the limiting requirement; after determining the actual output current value of the target reactive compensation device that meets the limiting requirement, the sixth calculation unit 108 can be further used to calculate the voltage reference value of the valve side of the target reactive compensation device based on the actual output current value of the target reactive compensation device that meets the limiting requirement and the actual value of the control node voltage; and then the seventh calculation unit 109 can be used to calculate the current value of the controlled current source based on the voltage reference value of the valve side of the target reactive compensation device. After determining the current value of the controlled current source, the eighth calculation unit 110 can be used to calculate the voltage of each node of the AC power grid based on the current value of the controlled current source.

[0216] The device provided in the embodiment of the present application can connect the reactive compensation equipment to the AC power grid according to a preset circuit model, and the controlled current source in the preset circuit model can be calculated through relevant parameters, thereby improving the numerical stability of the electromechanical transient simulation of the reactive compensation equipment. At the same time, the current output by the reactive compensation equipment at this time can be calculated based on the voltage reference value on the valve side of the reactive compensation equipment and the actual value of the control node voltage of the reactive compensation equipment, and the current output by the reactive compensation equipment can be judged and processed as being out of limit, ensuring that the switching devices of the reactive compensation equipment do not over-current and will not cause damage to the reactive compensation equipment. The reactive compensation equipment can be effectively protected and the service life of the reactive compensation equipment can be increased. At the same time, the voltage of each node of the AC power grid can be calculated based on the current value of the controlled current source, thereby ensuring the stability of the voltage of each node of the AC power grid.

[0217] Further optionally, the device may also include:

[0218] A second judging unit, configured to judge whether the actual output current value of the target reactive power compensation device is less than or equal to a preset second threshold;

[0219] A setting unit is used to set the actual output current value of the target reactive compensation device to the preset second threshold value when the execution result of the second judgment unit determines that the actual output current value of the target reactive compensation device is less than or equal to the preset second threshold value, so as to obtain the actual output current value of the target reactive compensation device that meets the limiting requirement.

[0220] Further optionally, the calculation formula for calculating the valve-side voltage reference value of the target reactive power compensation device in the second calculation unit 103 based on the output current reference value of the target reactive power compensation device and the preset control node voltage reference value may include:

[0221] U ref ∠θ=U sref ∠θ+(I sref *X)∠θ

[0222] U ref It can represent the voltage reference value on the valve side of the target reactive power compensation equipment;

[0223] θ can represent the actual value of the phase angle of the control node voltage of the target reactive power compensation device;

[0224] U sref It can represent the control node voltage reference value of the target reactive power compensation device;

[0225] I sref It can represent the output current reference value of the target reactive power compensation equipment;

[0226] X can represent the reactance of the grid-connected transformer.

[0227] Further optionally, the preset first threshold may be set with reference to a maximum current limit value of a switching device of the target reactive power compensation device.

[0228] Further optionally, the calculation formula for calculating the actual output current value of the target reactive power compensation device based on the voltage reference value of the valve side of the target reactive power compensation device and the actual value of the control node voltage in the third calculation unit 104 may include:

[0229]

[0230] I s It can indicate the actual output current value of the target reactive power compensation equipment;

[0231] U ref It can represent the actual voltage value of the target reactive power compensation device control node;

[0232] U s It can represent the voltage reference value of the control node of the target reactive power compensation equipment;

[0233] X can represent the reactance of the grid-connected transformer.

[0234] Further optionally, the sixth calculation unit 108 calculates a calculation formula for the valve-side voltage reference value of the target reactive power compensation device based on the actual output current value of the target reactive power compensation device that meets the limit requirement and the actual value of the control node voltage, which may include:

[0235] U' ref ∠θ=U s ∠θ+(I s *X)∠θ

[0236] in,

[0237] U' ref It can represent the voltage reference value of the valve side of the target reactive power compensation device after correction;

[0238] θ can represent the actual value of the phase angle of the control node voltage of the target reactive power compensation device;

[0239] U s It can represent the actual value of the control node voltage of the target reactive power compensation device;

[0240] I s It can indicate the actual current value output by the target reactive power compensation equipment;

[0241] X can represent the reactance of the grid-connected transformer.

[0242] Further optionally, the calculation formula for calculating the current value of the controlled current source according to the voltage reference value of the valve side of the target reactive power compensation device in the seventh calculation unit 109 may include:

[0243]

[0244] in,

[0245] I qeq Can represent the current value of the controlled current source;

[0246] U' ref It can represent the voltage reference value of the valve side of the target reactive power compensation device after correction;

[0247] X can represent the reactance of the grid-connected transformer. The specific processing flow of each unit included in the above-mentioned transient modeling device for reactive compensation equipment can be referred to the relevant introduction of the transient modeling method for reactive compensation equipment above, and will not be repeated here.

[0248] The transient modeling device for reactive power compensation equipment provided in the embodiment of the present application can be applied to transient modeling devices for reactive power compensation equipment, such as terminals: mobile phones, computers, etc. Optionally, Figure 6 The hardware structure diagram of the transient modeling equipment of reactive compensation equipment is shown. Figure 6 The hardware structure of the reactive compensation device transient modeling device may include: at least one processor 1, at least one communication interface 2, at least one memory 3 and at least one communication bus 4.

[0249] In an embodiment of the present application, the number of processor 1 , communication interface 2 , memory 3 , and communication bus 4 is at least one, and the processor 1 , communication interface 2 , and memory 3 communicate with each other through the communication bus 4 .

[0250] The processor 1 may be a central processing unit (CPU), or an application-specific integrated circuit (ASIC), or one or more integrated circuits configured to implement the embodiments of the present application;

[0251] The memory 3 may include a high-speed RAM memory, and may also include a non-volatile memory, such as at least one disk memory;

[0252] The memory stores a program, and the processor can call the program stored in the memory, wherein the program is used to implement each processing flow in the aforementioned transient modeling solution for terminal reactive power compensation equipment.

[0253] An embodiment of the present application also provides a readable storage medium, which can store a program suitable for execution by a processor, and the program is used to: implement various processing flows of the aforementioned terminal in the transient modeling scheme of reactive compensation equipment.

[0254] Finally, it should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article, or device comprising the element.

[0255] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0256] The above description of the disclosed embodiments is intended to enable those skilled in the art to implement or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. The various embodiments may be combined with one another. Therefore, the present application is not limited to the embodiments shown herein, but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A transient modeling method for reactive power compensation equipment, characterized in that: include: Connecting the target reactive power compensation device to the AC power grid according to a preset circuit model, wherein the preset circuit model includes a controlled current source; Calculating an output current reference value of the target reactive power compensation device; According to the output current reference value of the target reactive power compensation device and the preset control node voltage reference value, the voltage reference value of the valve side of the target reactive power compensation device is calculated, and the calculation formula includes: U ref ∠θ=U sref ∠θ+(I sref *X)∠θ U ref represents the voltage reference value of the valve side of the target reactive power compensation device, θ represents the actual value of the phase angle of the control node voltage of the target reactive power compensation device, U sref Indicates the control node voltage reference value of the target reactive power compensation device, I sref represents the output current reference value of the target reactive power compensation device, and X represents the reactance of the grid-connected transformer; wherein the preset control node voltage reference value is the control node voltage reference value of the target reactive power compensation device; Calculating the actual value of the output current of the target reactive power compensation device according to the voltage reference value of the valve side of the target reactive power compensation device and the actual value of the control node voltage; Determine whether the actual output current value of the target reactive power compensation device exceeds a preset first threshold value; the preset first threshold value is set with reference to the maximum limit value of the current of the switch device of the target reactive power compensation device; If the actual output current value of the target reactive power compensation device exceeds the preset first threshold value, the actual output current value of the target reactive power compensation device is set to the preset first threshold value to obtain the actual output current value of the target reactive power compensation device that meets the amplitude limiting requirement; If the actual output current value of the target reactive power compensation device does not exceed the preset first threshold value, the actual output current value of the target reactive power compensation device is used as the actual output current value of the target reactive power compensation device that meets the amplitude limiting requirement; According to the actual value of the output current of the target reactive power compensation device that meets the limit requirement and the actual value of the control node voltage, the voltage reference value of the valve side of the target reactive power compensation device is calculated, and the calculation formula includes: U' ref ∠θ=U s ∠θ+(I s *X)∠θ Among them, U' ref represents the voltage reference value of the valve side of the target reactive power compensation device after correction, θ represents the actual value of the phase angle of the control node voltage of the target reactive power compensation device, U s Indicates the actual value of the control node voltage of the target reactive power compensation device, I s represents the actual current value output by the target reactive power compensation device, and X represents the reactance of the grid-connected transformer; Calculating the current value of the controlled current source according to the voltage reference value of the valve side of the target reactive power compensation device; The voltage of each node of the AC power grid is calculated according to the current value of the controlled current source.

2. The method according to claim 1, characterized in that The method further includes: Determining whether the actual output current value of the target reactive power compensation device is less than or equal to a preset second threshold; If the actual output current value of the target reactive compensation device is less than or equal to the preset second threshold, the actual output current value of the target reactive compensation device is set to the preset second threshold to obtain the actual output current value of the target reactive compensation device that meets the limiting requirement.

3. The method according to claim 1, characterized in that The calculation formula for calculating the actual value of the output current of the target reactive power compensation device according to the voltage reference value of the valve side of the target reactive power compensation device and the actual value of the control node voltage includes: I s Indicates the actual value of the output current of the target reactive power compensation device; U ref Indicates the actual voltage value of the target reactive power compensation device control node; U s Indicates the actual value of the voltage at the control node of the target reactive power compensation device; X represents the reactance of the grid-connected transformer.

4. The method according to claim 2, characterized in that: The preset second threshold is set with reference to the minimum current limit value of the switching component of the target reactive power compensation device.

5. The method according to any one of claims 1 to 4, characterized in that The calculation formula for calculating the current value of the controlled current source according to the voltage reference value of the valve side of the target reactive power compensation device includes: in, I qeq Represents the current value of the controlled current source; U' ref Indicates the voltage reference value of the valve side of the target reactive power compensation device after correction; X represents the reactance of the grid-connected transformer.

6. A transient modeling device for reactive power compensation equipment, characterized in that: include: A connecting unit, used to connect the target reactive power compensation device to the AC power grid according to a preset circuit model, wherein the preset circuit model includes a controlled current source; A first calculation unit, used for calculating an output current reference value of the target reactive power compensation device; The second calculation unit is used to calculate the voltage reference value of the valve side of the target reactive power compensation device according to the output current reference value of the target reactive power compensation device and the preset control node voltage reference value, and the calculation formula includes: U ref ∠θ=U sref ∠θ+(I sref *X)∠θ U ref represents the voltage reference value of the valve side of the target reactive power compensation device, θ represents the actual value of the phase angle of the control node voltage of the target reactive power compensation device, U sref Indicates the control node voltage reference value of the target reactive power compensation device, I sref represents the output current reference value of the target reactive power compensation device, and X represents the reactance of the grid-connected transformer; wherein the preset control node voltage reference value is the control node voltage reference value of the target reactive power compensation device; A third calculation unit, configured to calculate an actual value of an output current of the target reactive power compensation device according to a voltage reference value of a valve side of the target reactive power compensation device and an actual value of a voltage at the control node; A first judgment unit is used to judge whether the actual value of the output current of the target reactive power compensation device exceeds a preset first threshold value; the preset first threshold value is set with reference to the maximum limit value of the current of the switch device of the target reactive power compensation device; a fourth calculation unit, configured to, when the execution result of the first judgment unit determines that the actual output current value of the target reactive power compensation device exceeds a preset threshold value, set the actual output current value of the target reactive power compensation device to the preset first threshold value, so as to obtain the actual output current value of the target reactive power compensation device that meets the limit requirement; a fifth calculation unit, configured to use the actual output current value of the target reactive power compensation device as the actual output current value of the target reactive power compensation device that meets the limit requirement when the execution result of the first judgment unit determines that the actual output current value of the target reactive power compensation device does not exceed a preset threshold value; The sixth calculation unit is used to calculate the voltage reference value of the valve side of the target reactive power compensation device according to the actual value of the output current of the target reactive power compensation device that meets the limit requirement and the actual value of the control node voltage, and the calculation formula includes: U' ref ∠θ=U s ∠θ+(I s *X)∠θ Among them, U' ref represents the voltage reference value of the valve side of the target reactive power compensation device after correction, θ represents the actual value of the phase angle of the control node voltage of the target reactive power compensation device, U s Indicates the actual value of the control node voltage of the target reactive power compensation device, I s represents the actual current value output by the target reactive power compensation device, and X represents the reactance of the grid-connected transformer; a seventh calculation unit, configured to calculate a current value of the controlled current source according to a voltage reference value of a valve side of the target reactive power compensation device; An eighth calculation unit is used to calculate the voltage of each node of the AC power grid according to the current value of the controlled current source.

7. A transient modeling device for reactive power compensation equipment, characterized in that: include: one or more processors, and memory; The memory stores computer-readable instructions, and when the computer-readable instructions are executed by the one or more processors, the steps of the method for transient modeling of reactive compensation equipment according to any one of claims 1 to 5 are implemented.

8. A readable storage medium, characterized in that: The readable storage medium stores computer-readable instructions, and when the computer-readable instructions are executed by one or more processors, the one or more processors implement the steps of the transient modeling method for reactive compensation equipment as described in any one of claims 1 to 5.

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