High voltage ride-through characteristics simulation system based on dynamic reactive power compensation device

Abstract

The present application provides a high voltage ride-through characteristic simulation system based on a dynamic reactive power compensation device, the system comprising: a high voltage ride-through trigger circuit, receiving a positive sequence signal and a negative sequence signal of a terminal voltage output by a dynamic reactive power compensation device, and generating a high voltage ride-through trigger signal according to the positive sequence signal and the negative sequence signal; a high voltage ride-through current command output circuit, receiving a reference value of reactive current at the moment of high ride-through, a reference value of conventionally controlled reactive current, a terminal voltage signal output by the dynamic reactive power compensation device, and the high voltage ride-through trigger signal, and generating a command value of reactive current according to the reference value of reactive current at the moment of high ride-through, a reference value of conventionally controlled reactive current, the terminal voltage signal, and the high voltage ride-through trigger signal. The present application can simulate the electromagnetic transient characteristics of a dynamic reactive power compensation device under high voltage ride-through conditions.

Description

Technical Field

[0001] The present application relates to the field of power supply equipment characteristic simulation, and specifically to a high voltage ride-through characteristic simulation system based on a dynamic reactive power compensation device. Background Art

[0002] With the development of power systems, people's requirements for the grid connection of renewable energy power stations are increasing, and the requirements for equipping renewable energy power stations with dynamic reactive power compensation devices are also increasing. In this context, obtaining the electromagnetic transient model of the dynamic reactive power compensation device has become an important task in the field of power system simulation.

[0003] The high voltage ride-through capability of the dynamic VAR compensation device is of great significance to the voltage stability and frequency stability of the power system. Therefore, modeling the electromagnetic transient characteristics of the dynamic VAR compensation device under high voltage ride-through conditions is a very critical task.

[0004] In the prior art, when modeling the high voltage ride-through characteristics of a dynamic reactive power compensation device, it is generally achieved by collecting the input voltage and output current of the dynamic reactive power compensation device. Specifically, the external characteristics such as the input voltage and output current of the dynamic reactive power compensation device in the historical time period are first counted, and then the mathematical relationship between the input voltage and the output current is fitted based on these external characteristics, and finally the high voltage ride-through characteristics of the dynamic reactive power compensation device are simulated based on the mathematical relationship. However, the simulation accuracy of this method is poor, and it is still unable to simulate the electromagnetic transient characteristics of the dynamic reactive power compensation device under the high voltage ride-through situation. Summary of the invention

[0005] In response to the problems in the prior art, the present application provides a high voltage ride-through characteristic simulation system based on a dynamic reactive power compensation device, which can simulate the electromagnetic transient characteristics of the dynamic reactive power compensation device under high voltage ride-through conditions.

[0006] In order to solve the above technical problems, this application provides the following technical solutions:

[0007] The present application provides a high voltage ride-through characteristic simulation system based on a dynamic reactive power compensation device, comprising:

[0008] A high voltage ride through trigger circuit receives a positive sequence signal and a negative sequence signal of a terminal voltage output by a dynamic reactive power compensation device, and generates a high voltage ride through trigger signal according to the positive sequence signal and the negative sequence signal;

[0009] The high-penetration current command output circuit receives a reference value of reactive current at the high-penetration moment, a reference value of conventionally controlled reactive current, a terminal voltage signal output by the dynamic reactive compensation device, and the high-penetration trigger signal, and generates a command value of reactive current according to the reference value of reactive current at the high-penetration moment, the reference value of conventionally controlled reactive current, the terminal voltage signal, and the high-penetration trigger signal.

[0010] Furthermore, the high voltage ride through trigger circuit comprises:

[0011] A first adder, receiving the positive sequence signal and the negative sequence signal, and generating a first addition signal according to the positive sequence signal and the negative sequence signal;

[0012] A hysteresis circuit receives the first addition signal and generates a hysteresis signal according to a preset threshold value of the hysteresis circuit and the first addition signal;

[0013] A sampling and holding circuit receives a first clock signal and the hysteresis signal, and generates a sampling signal according to the first clock signal and the hysteresis signal;

[0014] A second adder, receiving a second clock signal and the sampling signal, and generating a second addition signal according to the second clock signal and the sampling signal;

[0015] a first signal selection circuit, receiving the hysteresis signal and the second addition signal, and outputting a first selection signal according to the hysteresis signal, the second addition signal and a threshold value of a preset first signal selection circuit; the first selection signal is a 0 signal or the second addition signal;

[0016] a second signal selection circuit, receiving the first selection signal, and outputting a second selection signal according to the first selection signal and a preset threshold value of the second signal selection circuit; the second selection signal is a 0 signal or a 1 signal;

[0017] The first multiplier receives the second selection signal and the hysteresis signal, and generates the high voltage ride-through trigger signal according to the second selection signal and the hysteresis signal.

[0018] Furthermore, the high penetration current instruction output circuit includes:

[0019] a first mode output circuit, receiving the reference value of the reactive current at the high voltage ride-through moment, the terminal voltage signal and the high voltage ride-through trigger signal, and generating a first mode current command signal according to the reference value of the reactive current at the high voltage ride-through moment, the terminal voltage signal, the high voltage ride-through trigger signal, a preset reactive voltage calculation standard value and a reactive current calculation ratio;

[0020] a second mode output circuit, receiving the reference value of the conventional reactive current control and the high voltage ride through trigger signal, and generating a second mode current command signal according to the reference value of the conventional reactive current control and the high voltage ride through trigger signal;

[0021] The output mode selection circuit receives a high-throughput mode switching signal, the first mode current command signal, and the second mode current command signal, and generates a command value of a reactive current according to the high-throughput mode switching signal, the first mode current command signal, and the second mode current command signal.

[0022] Furthermore, the first mode output circuit includes:

[0023] a third adder, receiving the terminal voltage signal and the reactive voltage calculation standard value, and generating a third addition signal according to the terminal voltage signal and the reactive voltage calculation standard value;

[0024] a second multiplier, receiving the reactive current calculation ratio and the third addition signal, and generating a second multiplication signal according to the reactive current calculation ratio and the third addition signal;

[0025] a third multiplier, receiving the second multiplication signal and the high voltage ride through trigger signal, and generating a third multiplication signal according to the second multiplication signal and the high voltage ride through trigger signal;

[0026] The fourth adder receives the reference value of the reactive current at the high-breakthrough moment and the third multiplication signal, and generates the first mode current command signal according to the reference value of the reactive current at the high-breakthrough moment and the third multiplication signal.

[0027] Furthermore, the second mode output circuit includes:

[0028] The third signal selection circuit receives the reference value of the conventional controlled reactive current and the high voltage ride-through trigger signal, and generates the second mode current command signal according to the reference value of the conventional controlled reactive current, the high voltage ride-through trigger signal and a preset threshold value of the third signal selection circuit.

[0029] Furthermore, the output mode selection circuit includes:

[0030] a fourth signal selection circuit, receiving the high-throughput mode switching signal, the first mode current command signal, and the second mode current command signal, and generating a third selection signal according to the high-throughput mode switching signal, the first mode current command signal, the second mode current command signal, and a preset threshold value of the fourth selection circuit;

[0031] The fifth signal selection circuit receives the third selection signal, the reference value of the conventionally controlled reactive current and the high-throughput trigger signal, and generates the command value of the reactive current according to the third selection signal, the reference value of the conventionally controlled reactive current and the high-throughput trigger signal.

[0032] Further, the hysteresis circuit is specifically used to compare the first addition signal with the preset threshold value of the hysteresis circuit;

[0033] If the first added signal is greater than or equal to the threshold value of the preset hysteresis circuit, output a 1 signal;

[0034] If the first added signal is smaller than the preset threshold value of the hysteresis circuit, a 0 signal is output.

[0035] Further, when the hysteresis signal changes from a 0 signal to a 1 signal, the sampling and holding circuit outputs the first clock signal as the hysteresis signal.

[0036] Further, when the hysteresis signal is a 1 signal, the first signal selection circuit outputs the second addition signal as the first selection signal; when the hysteresis signal is a 0 signal, the first signal selection circuit outputs a 0 signal as the first selection signal.

[0037] Further, when the first selection signal is the second addition signal and the second addition signal is greater than or equal to a threshold value of the second signal selection circuit, the second signal selection circuit outputs a 1 signal as the second selection signal; when the first selection signal is a 0 signal, the second signal selection circuit outputs a 0 signal as the second selection signal.

[0038] Further, when the high-throughput trigger signal is 1, the third signal selection circuit outputs the rated current of the dynamic reactive compensation device as the second mode current command signal; when the high-throughput trigger signal is less than 1, the third signal selection circuit outputs the reference value of the conventional control reactive current as the second mode current command signal.

[0039] Further, when the high-throughput mode switching signal is 1, the fourth signal selection circuit outputs the first mode current command signal as the third selection signal; when the high-throughput mode switching signal is 0, the fourth signal selection circuit outputs the second mode current command signal as the third selection signal.

[0040] Further, when the high-through trigger signal is 1, the fifth signal selection circuit outputs the third selection signal as the command value of the reactive current; when the high-through trigger signal is 0, the fifth signal selection circuit outputs the reference value of the conventionally controlled reactive current as the command value of the reactive current.

[0041] In response to the problems in the prior art, the high voltage ride-through characteristic simulation system based on the dynamic reactive compensation device provided in the present application can simulate the electromagnetic transient characteristics of the dynamic reactive compensation device under high voltage ride-through conditions, and can be used to analyze the reactive characteristics of the dynamic reactive compensation device when a high voltage fault occurs in the power system, and guide the reactive current output of the dynamic reactive compensation device when a high voltage fault occurs in the power system, which has positive significance for ensuring the voltage stability and frequency stability of the power system. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0043] Figure 1 This is an application scenario diagram of a high voltage ride-through characteristic simulation system based on a dynamic reactive power compensation device in an embodiment of the present application;

[0044] Figure 2 This is a structural diagram of a high voltage ride-through characteristic simulation system based on a dynamic reactive power compensation device in an embodiment of the present application;

[0045] Figure 3 This is a structural diagram of a high voltage ride through trigger circuit in an embodiment of the present application;

[0046] Figure 4 It is a simulation schematic diagram in the embodiment of the present application. DETAILED DESCRIPTION

[0047] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0048] See also Figure 1In order to simulate the electromagnetic transient characteristics of a dynamic reactive power compensation device under a high voltage ride-through condition, the present application provides a high voltage ride-through characteristic simulation system based on a dynamic reactive power compensation device.

[0049] It is understandable that when a high voltage fault occurs in the power system, the generator set may suffer from voltage oscillation and frequency oscillation, affecting the normal operation of the generator set. In order to alleviate the above oscillation, it is usually necessary to equip the generator set with a dynamic reactive power compensation device. The dynamic reactive power compensation device can output dynamically changing reactive current to effectively improve the power factor and output of the generator set, improve the power quality, reduce line loss, and achieve the purpose of energy saving and consumption reduction.

[0050] However, in actual applications, the reactive current output by the dynamic reactive compensation device cannot completely offset the impact of voltage oscillation and frequency oscillation on the power factor and output of the generator set, because considering various environmental factors, the reactive current output by the dynamic reactive compensation device cannot change in real time following the voltage oscillation and frequency oscillation. Sometimes the reactive current output by the dynamic reactive compensation device is too large, and the compensation is excessive, resulting in a waste of electric energy; sometimes the reactive current output by the dynamic reactive compensation device is too small to offset the impact of the oscillation.

[0051] To this end, the present application intends to simulate the electromagnetic transient characteristics of the dynamic reactive compensation device under high voltage crossing conditions, so as to determine the size of the reactive current that the dynamic reactive compensation device needs to output when a high voltage fault occurs in the power generation system, and then guide the dynamic reactive compensation device to output a reactive current of appropriate size under the action of a controlled power supply.

[0052] It should be noted that the dynamic reactive power compensation device in the embodiment of the present application has a high voltage ride through capability. The so-called high voltage ride through capability refers to the ability of the power equipment to continue to operate without disconnecting from the power grid when its terminal voltage rises to a certain value, and even to provide a certain amount of reactive power to the power grid to help the power grid restore voltage.

[0053] Based on the above application scenario, see Figure 1 The input end of the high voltage ride-through characteristic simulation system based on the dynamic reactive compensation device provided in the present application can be connected to the voltage output end of the dynamic reactive compensation device to receive the terminal voltage signal output by the dynamic reactive compensation device; the output end of the system can be connected to the controlled power supply end of the dynamic reactive compensation device so that the reactive compensation device can output a reactive current of appropriate size under the action of the controlled power supply.

[0054] Specifically, see Figure 2The high voltage ride-through characteristic simulation system based on the dynamic reactive power compensation device provided in the present application includes: a high voltage ride-through trigger circuit and a high voltage ride-through current command output circuit.

[0055] Among them, the high voltage ride-through trigger circuit receives the positive sequence signal Vabc_B690_Mag and the negative sequence signal Vabc_B690_Mag_Neg of the terminal voltage output by the dynamic reactive power compensation device, and generates a high ride-through trigger signal according to the positive sequence signal Vabc_B690_Mag and the negative sequence signal Vabc_B690_Mag_Neg. The high ride-through current command output circuit receives the reference value of the reactive current at the high ride-through moment, the reference value of the conventionally controlled reactive current, the terminal voltage signal and the high ride-through trigger signal output by the dynamic reactive power compensation device, and generates a command value of the reactive current according to the reference value of the reactive current at the high ride-through moment, the reference value of the conventionally controlled reactive current, the terminal voltage signal and the high ride-through trigger signal. Finally, the dynamic reactive power compensation device can output a reactive current equal to the command value of the reactive current according to the reactive current command value under the action of the controlled power supply.

[0056] From the above description, it can be seen that the high voltage ride-through characteristic simulation system based on the dynamic reactive compensation device provided in the present application can simulate the electromagnetic transient characteristics of the dynamic reactive compensation device under high voltage ride-through conditions, and can be used to analyze the reactive characteristics of the dynamic reactive compensation device when a high voltage fault occurs in the power system, and guide the reactive current output of the dynamic reactive compensation device when a high voltage fault occurs in the power system, which has positive significance for ensuring the voltage stability and frequency stability of the power system.

[0057] In one embodiment, see Figure 3 The high voltage ride-through trigger circuit includes: an adder 1, a hysteresis circuit 2, a clock 3, a sample and hold circuit 3, an adder 4, a signal selection circuit 5, a signal selection circuit 6, a multiplier 7, a clock 8 and a clock 9.

[0058] Wherein, the adder 1 receives the terminal voltage positive sequence signal Vabc_B690_Mag and the terminal voltage negative sequence signal Vabc_B690_Mag_Neg of the dynamic reactive power compensation device, and generates a first addition signal according to the positive sequence signal Vabc_B690_Mag and the negative sequence signal Vabc_B690_Mag_Neg; the hysteresis circuit 2 receives the first addition signal, and generates a hysteresis signal according to the preset threshold value of the hysteresis circuit 2 and the first addition signal; the sampling and holding circuit 3 receives the first clock signal generated by the clock 8, and generates a sampling signal according to the first clock signal and the hysteresis signal; the adder 4 receives the sampling signal and the clock The second clock signal generated by the sampling device 9 is received, and a second addition signal is generated according to the second clock signal and the sampling signal; the signal selection circuit 5 receives the hysteresis signal and the second addition signal, and outputs a first selection signal (0 signal or second addition signal) according to the hysteresis signal, the second addition signal and a threshold value of the preset signal selection circuit 5; the signal selection circuit 6 receives the first selection signal, and outputs a second selection signal (0 signal or 1 signal) according to the first selection signal and a threshold value of the preset signal selection circuit 6; the multiplier 7 receives the second selection signal and the hysteresis signal, and generates a high voltage ride-through trigger signal HVRT_dur according to the second selection signal and the hysteresis signal.

[0059] Specifically, the working principle of the high voltage ride-through trigger circuit is as follows:

[0060] First, the terminal voltage positive sequence signal Vabc_B690_Mag and the terminal voltage negative sequence signal Vabc_B690_Mag_Neg of the dynamic reactive power compensation device are input to the adder 1, and the adder 1 adds the terminal voltage positive sequence signal Vabc_B690_Mag and the terminal voltage negative sequence signal Vabc_B690_Mag_Neg to generate a first addition signal. It should be noted that this addition operation is an addition with positive and negative signs, rather than an absolute value addition.

[0061] Then, the first addition signal is input to the hysteresis circuit 2, and the first addition signal is compared with the enable threshold value of the hysteresis circuit 2; if the first addition signal is greater than or equal to the enable threshold value, the hysteresis circuit 2 outputs a 1 signal; otherwise, the hysteresis circuit 2 outputs a 0 signal. In one embodiment of the present application, the enable threshold value is 1.1×690V, but the present application is not limited thereto. In practical applications, a reset threshold value of the hysteresis circuit 2 can also be set. The hysteresis circuit 2 can compare the magnitude relationship between the first addition signal and the reset threshold value, so that when the first addition signal is lower than the reset threshold value, the hysteresis circuit 2 outputs a 0 signal. Generally, the enable threshold value can be higher than the reset threshold value. In one embodiment of the present application, the reset threshold value is 1.0×690V, but the present application is not limited thereto.

[0062] Finally, if the hysteresis circuit 2 outputs a 1 signal, the sampling and holding circuit 3 can be triggered to output the first clock signal generated by the clock 8 as a sampling signal; at this time, the adder 4 receives the second clock signal generated by the clock 9, and subtracts the first clock signal from the second clock signal to obtain a second addition signal. Among them, the second addition signal can be understood as the duration of the high voltage ride-through state. When the time is greater than the threshold value of the signal selection circuit 6, the signal selection circuit 6 outputs a 1 signal as the second selection signal; otherwise, the signal selection circuit 6 outputs a 0 signal as the second selection signal. The multiplier 7 receives the second selection signal and the hysteresis signal; when the second selection signal and the hysteresis signal are both 1 signals, the multiplier 7 outputs a 1 signal as a high voltage ride-through trigger signal HVRT_dur, that is, triggering the high voltage ride-through, and obtaining a high wear flag; when either the second selection signal or the hysteresis signal is a 0 signal, the multiplier 7 outputs a 0 signal as a high voltage ride-through trigger signal HVRT_dur, that is, not triggering the high voltage ride-through.

[0063] It should be noted that in one embodiment of the present application, the threshold value of the signal selection circuit 6 is 0.005s, but the present application is not limited thereto. It should also be noted that the signal selection circuit 5 outputs the second addition signal as the first selection signal only when it receives a 1 signal as the hysteresis signal; otherwise, it outputs a 0 signal as the first selection signal.

[0064] It can be seen from the above description that the high voltage ride through characteristic simulation system based on the dynamic reactive power compensation device provided in the present application can trigger the high voltage ride through by using the high voltage ride through trigger circuit.

[0065] In one embodiment, see Figure 3 The high-throughput current instruction output circuit includes: a first mode output circuit, a second mode output circuit and an output mode selection circuit.

[0066] Among them, the first mode output circuit receives the reference value IqrefSVGHVRT of the reactive current at the high-voltage moment, the terminal voltage signal Vabc_Bstatcom_Mag and the high-voltage ride-through trigger signal HVRT_dur, and generates the first mode current command signal according to the reference value IqrefSVGHVRT of the reactive current at the high-voltage moment, the terminal voltage signal Vabc_Bstatcom_Mag, the high-voltage ride-through trigger signal HVRT_dur, the preset reactive voltage calculation standard value and the reactive current calculation ratio; the second mode output circuit receives the reference value IqrefSVG of the conventional control reactive current and the high-voltage ride-through trigger signal HVRT_dur, and generates the second mode current command signal according to the reference value IqrefSVG of the conventional control reactive current and the high-voltage ride-through trigger signal HVRT_dur; the output mode selection circuit receives the high-voltage mode switching signal, the first mode current command signal and the second mode current command signal, and generates the command value of the reactive current according to the high-voltage mode switching signal, the first mode current command signal and the second mode current command signal.

[0067] It can be seen from the above description that the high voltage ride-through characteristic simulation system based on the dynamic reactive power compensation device provided in the present application can generate a reactive current command value by using a high voltage ride-through current command output circuit.

[0068] In one embodiment, see Figure 3 The first mode output circuit includes: an adder 10, a multiplier 11, a multiplier 12 and an adder 13.

[0069] Among them, the adder 10 receives the terminal voltage signal Vabc_Bstatcom_Mag and the reactive voltage calculation standard value, and generates a third addition signal according to the terminal voltage signal Vabc_Bstatcom_Mag and the reactive voltage calculation standard value; the multiplier 11 receives the reactive current calculation ratio and the third addition signal, and generates a second multiplication signal according to the reactive current calculation ratio and the third addition signal; the multiplier 12 receives the second multiplication signal and the high voltage ride-through trigger signal HVRT_dur, and generates a third multiplication signal according to the second multiplication signal and the high voltage ride-through trigger signal HVRT_dur; the adder 13 receives the reference value IqrefSVGHVRT of the reactive current at the high voltage ride-through moment and the third multiplication signal, and generates a first mode current command signal according to the reference value IqrefSVGHVRT of the reactive current at the high voltage ride-through moment and the third multiplication signal.

[0070] Specifically, the working principle of the first mode output circuit is as follows:

[0071] First, the adder 10 subtracts the reactive voltage calculation standard value from the terminal voltage signal Vabc_Bstatcom_Mag to generate a third addition signal; wherein the reactive voltage calculation standard value is a preset value, which can be set to 1.1×690V in the embodiment of the present application, but the present application is not limited thereto.

[0072] Then, the multiplier 11 multiplies the reactive current calculation ratio by the third addition signal to generate a second multiplication signal; wherein the reactive current calculation ratio is a preset value, which can be set to 1.5 in the embodiment of the present application, but the present application is not limited thereto. The multiplier 12 receives the second multiplication signal and the high voltage ride-through trigger signal HVRT_dur, and generates a third multiplication signal according to the second multiplication signal and the high voltage ride-through trigger signal HVRT_dur; this step can be understood as, when the high voltage ride-through trigger signal HVRT_dur is a 1 signal, the multiplier 12 outputs the second multiplication signal as the third multiplication signal.

[0073] Finally, the adder 13 adds the reference value IqrefSVGHVRT of the reactive current at the high voltage ride-through moment to the third multiplication signal to generate a first mode current command signal; wherein the reference value IqrefSVGHVRT of the reactive current at the high voltage ride-through moment is the reactive current output by the dynamic reactive compensation device at the moment of entering the high voltage ride-through.

[0074] It can be seen from the above description that the high voltage ride-through characteristic simulation system based on the dynamic reactive power compensation device provided in the present application can generate a first mode current command signal by using a first mode output circuit.

[0075] In one embodiment, see Figure 3 , the second mode output circuit is the signal selection circuit 14.

[0076] Specifically, the signal selection circuit 14 receives the conventional reactive current control reference value IqrefSVG and the high voltage ride through trigger signal HVRT_dur, and generates the second mode current command signal according to the conventional reactive current control reference value IqrefSVG, the high voltage ride through trigger signal HVRT_dur and a preset threshold value of the signal selection circuit 14 .

[0077] Specifically, the working principle of the second mode output circuit is as follows:

[0078] When the high voltage ride-through trigger signal HVRT_dur is a 1 signal, the signal selection circuit 14 outputs the rated current of the dynamic reactive power compensation device as the second mode current command signal; when the high voltage ride-through trigger signal HVRT_dur is a 0 signal, the signal selection circuit 14 outputs the reference value IqrefSVG of the conventional control reactive current as the second mode current command signal. The reference value IqrefSVG of the conventional control reactive current refers to the reactive current value output by the dynamic reactive power compensation device under the conventional control state, and the value can change in real time.

[0079] It can be seen from the above description that the high voltage ride-through characteristic simulation system based on the dynamic reactive power compensation device provided in the present application can generate a second mode current command signal by using the second mode output circuit.

[0080] In one embodiment, see Figure 3 The output mode selection circuit includes: a signal selection circuit 15 and a signal selection circuit 16.

[0081] Among them, the signal selection circuit 15 receives the high-throughput mode switching signal, the first mode current command signal and the second mode current command signal, and generates a third selection signal according to the high-throughput mode switching signal, the first mode current command signal, the second mode current command signal and the threshold value of the preset fourth selection circuit; the signal selection circuit 16 receives the third selection signal, the reference value IqrefSVG of the conventional control reactive current and the high-throughput trigger signal, and generates the command value of the reactive current according to the third selection signal, the reference value IqrefSVG of the conventional control reactive current and the high-throughput trigger signal. Among them, the high-throughput mode switching signal can be a 0 signal or a 1 signal, which can be preset according to actual needs.

[0082] Specifically, the working principle of the output mode selection circuit is as follows:

[0083] First, when the high-throughput mode switching signal is a 1 signal, the signal selection circuit 15 outputs the first mode current command signal as the third selection signal; when the high-throughput mode switching signal is a 0 signal, the signal selection circuit 15 outputs the second mode current command signal as the third selection signal.

[0084] Then, the signal selection circuit 16 receives the third selection signal, the reference value IqrefSVG for conventionally controlling the reactive current, and the high-throughput trigger signal; when the high-throughput trigger signal is a 1 signal, the signal selection circuit 16 outputs the third selection signal as the command value of the reactive current; when the high-throughput trigger signal is a 0 signal, the signal selection circuit 16 outputs the reference value IqrefSVG for conventionally controlling the reactive current as the command value of the reactive current.

[0085] It can be seen from the above description that the high voltage ride-through characteristic simulation system based on the dynamic reactive power compensation device provided in the present application can generate a command value of reactive current by using the output mode selection circuit.

[0086] In one embodiment, the hysteresis circuit 2 is specifically used to compare the first addition signal with a preset threshold value of the hysteresis circuit 2; if the first addition signal is greater than or equal to the preset threshold value of the hysteresis circuit 2, a 1 signal is output; if the first addition signal is less than the preset threshold value of the hysteresis circuit 2, a 0 signal is output.

[0087] In one embodiment, when the hysteresis signal changes from a 0 signal to a 1 signal, the sampling and holding circuit 3 outputs the first clock signal as the hysteresis signal.

[0088] In one embodiment, when the hysteresis signal is a 1 signal, the signal selection circuit 5 outputs the second addition signal as the first selection signal; when the hysteresis signal is a 0 signal, the signal selection circuit 5 outputs a 0 signal as the first selection signal.

[0089] In one embodiment, when the first selection signal is the second addition signal and the second addition signal is greater than or equal to the threshold value of the signal selection circuit 6, the signal selection circuit 6 outputs a 1 signal as the second selection signal; when the first selection signal is a 0 signal, the signal selection circuit 6 outputs a 0 signal as the second selection signal.

[0090] In one embodiment, when the high-throughput trigger signal is 1, the signal selection circuit 14 outputs the rated current of the dynamic reactive compensation device as the second mode current command signal; when the high-throughput trigger signal is less than 1, the signal selection circuit 14 outputs the reference value IqrefSVG of the conventional control reactive current as the second mode current command signal.

[0091] In one embodiment, when the high-throughput mode switching signal is 1, the signal selection circuit 15 outputs the first mode current command signal as the third selection signal; when the high-throughput mode switching signal is 0, the signal selection circuit 15 outputs the second mode current command signal as the third selection signal.

[0092] In one embodiment, when the high-through trigger signal is 1, the signal selection circuit 16 outputs the third selection signal as the command value of the reactive current; when the high-through trigger signal is 0, the signal selection circuit 16 outputs the reference value IqrefSVG of the conventional control of the reactive current as the command value of the reactive current.

[0093] In order to illustrate the usability of the system provided by the present application, the output reactive current command value IqrefSVG given by the system provided by the present application is input into the electromagnetic transient simulation system of the infinite power grid (which can be a simulation system built using the Simulink visual simulation tool), and at the same time, a simulation model of the dynamic reactive compensation device is constructed using a visual simulation tool such as Simulink. The simulation model of the dynamic reactive compensation device is constructed according to Figure 1 The connection relationship shown is connected to the electromagnetic transient simulation system.

[0094] A high voltage test is carried out in the electromagnetic transient simulation system, and the command value IqrefSVG of the reactive current generated by the system provided by the present application is input into the simulation model of the dynamic reactive compensation device in the electromagnetic transient simulation system. The simulation model of the dynamic reactive compensation device can output a reactive current of appropriate magnitude under the control of the command value IqrefSVG of the reactive current.

[0095] The reactive current output by the simulation model of the dynamic reactive power compensation device under the control of the reactive current command value IqrefSVG is compared with the actual test results obtained by the RT-Lab test based on the actual controller (see the comparison results). Figure 4 As shown), it can be seen that the high voltage ride-through characteristic simulation system based on the dynamic reactive power compensation device provided by the present application can reproduce the characteristics of the RT-Lab physical controller, and then reproduce the active power characteristics of the high voltage ride-through process of the actual dynamic reactive power compensation device controller. The system provided by the present application is available.

[0096] Each embodiment in this specification is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the embodiment of the device implementation method, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment.

[0097] The above is a description of a specific embodiment of the specification. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recorded in the claims can be performed in an order different from that in the embodiments and still achieve the desired results. In addition, the processes depicted in the drawings do not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0098] Although the present specification embodiment provides the method operation steps as described in the embodiment or flow chart, more or less operation steps may be included based on conventional or non-creative means. The order of steps listed in the embodiment is only one way in the order of execution of many steps, and does not represent a unique execution order. The term "include", "comprise" or any other variant thereof is intended to cover non-exclusive inclusion, so that the process, method, product or equipment including a series of elements not only includes those elements, but also includes other elements not clearly listed, or also includes elements inherent to such process, method, product or equipment. In the absence of more restrictions, it is not excluded that there are other identical or equivalent elements in the process, method, product or equipment including the elements.

[0099] Each embodiment in this specification is described in a progressive manner, and the same and similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment. In the description of this specification, the description of the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiment of this specification. In this specification, the schematic representation of the above terms does not necessarily target the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, in the absence of contradiction, a person skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0100] The above is only an example of the embodiment of the present specification and is not intended to limit the embodiment of the present specification. For those skilled in the art, the embodiment of the present specification may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the embodiment of the present specification shall be included in the scope of the claims of the embodiment of the present specification.

Claims

1. A high voltage ride-through characteristics simulation system based on a dynamic reactive power compensation device, characterized in that: include: A high voltage ride through trigger circuit receives a positive sequence signal and a negative sequence signal of a terminal voltage output by a dynamic reactive power compensation device, and generates a high voltage ride through trigger signal according to the positive sequence signal and the negative sequence signal; A high-throughput current command output circuit receives a reference value of reactive current at a high-throughput moment, a reference value of conventionally controlled reactive current, a terminal voltage signal output by the dynamic reactive compensation device, and the high-throughput trigger signal, and generates a command value of reactive current according to the reference value of reactive current at a high-throughput moment, the reference value of conventionally controlled reactive current, the terminal voltage signal, and the high-throughput trigger signal; Wherein, the high voltage ride through trigger circuit comprises: A first adder, receiving the positive sequence signal and the negative sequence signal, and generating a first addition signal according to the positive sequence signal and the negative sequence signal; A hysteresis circuit receives the first addition signal and generates a hysteresis signal according to a preset threshold value of the hysteresis circuit and the first addition signal; A sampling and holding circuit receives a first clock signal and the hysteresis signal, and generates a sampling signal according to the first clock signal and the hysteresis signal; A second adder, receiving a second clock signal and the sampling signal, and generating a second addition signal according to the second clock signal and the sampling signal; a first signal selection circuit, receiving the hysteresis signal and the second addition signal, and outputting a first selection signal according to the hysteresis signal, the second addition signal and a threshold value of a preset first signal selection circuit; the first selection signal is a 0 signal or the second addition signal; a second signal selection circuit, receiving the first selection signal, and outputting a second selection signal according to the first selection signal and a preset threshold value of the second signal selection circuit; the second selection signal is a 0 signal or a 1 signal; The first multiplier receives the second selection signal and the hysteresis signal, and generates a high voltage ride-through trigger signal according to the second selection signal and the hysteresis signal.

2. The high voltage ride-through characteristics simulation system based on a dynamic reactive power compensation device according to claim 1 is characterized in that: The high penetration current instruction output circuit comprises: a first mode output circuit, receiving the reference value of the reactive current at the high voltage ride-through moment, the terminal voltage signal and the high voltage ride-through trigger signal, and generating a first mode current command signal according to the reference value of the reactive current at the high voltage ride-through moment, the terminal voltage signal, the high voltage ride-through trigger signal, a preset reactive voltage calculation standard value and a reactive current calculation ratio; a second mode output circuit, receiving the reference value of the conventional reactive current control and the high voltage ride through trigger signal, and generating a second mode current command signal according to the reference value of the conventional reactive current control and the high voltage ride through trigger signal; The output mode selection circuit receives a high-throughput mode switching signal, the first mode current command signal, and the second mode current command signal, and generates a command value of a reactive current according to the high-throughput mode switching signal, the first mode current command signal, and the second mode current command signal.

3. The high voltage ride-through characteristics simulation system based on a dynamic reactive power compensation device according to claim 2 is characterized in that: The first mode output circuit comprises: a third adder, receiving the terminal voltage signal and the reactive voltage calculation standard value, and generating a third addition signal according to the terminal voltage signal and the reactive voltage calculation standard value; a second multiplier, receiving the reactive current calculation ratio and the third addition signal, and generating a second multiplication signal according to the reactive current calculation ratio and the third addition signal; a third multiplier, receiving the second multiplication signal and the high voltage ride through trigger signal, and generating a third multiplication signal according to the second multiplication signal and the high voltage ride through trigger signal; The fourth adder receives the reference value of the reactive current at the high-breakthrough moment and the third multiplication signal, and generates the first mode current command signal according to the reference value of the reactive current at the high-breakthrough moment and the third multiplication signal.

4. The high voltage ride-through characteristics simulation system based on a dynamic reactive power compensation device according to claim 2 is characterized in that: The second mode output circuit is: The third signal selection circuit receives the reference value of the conventional controlled reactive current and the high voltage ride-through trigger signal, and generates the second mode current command signal according to the reference value of the conventional controlled reactive current, the high voltage ride-through trigger signal and a preset threshold value of the third signal selection circuit.

5. The high voltage ride-through characteristics simulation system based on a dynamic reactive power compensation device according to claim 2 is characterized in that: The output mode selection circuit comprises: a fourth signal selection circuit, receiving the high-throughput mode switching signal, the first mode current command signal, and the second mode current command signal, and generating a third selection signal according to the high-throughput mode switching signal, the first mode current command signal, the second mode current command signal, and a preset threshold value of the fourth selection circuit; The fifth signal selection circuit receives the third selection signal, the reference value of the conventionally controlled reactive current and the high-throughput trigger signal, and generates the command value of the reactive current according to the third selection signal, the reference value of the conventionally controlled reactive current and the high-throughput trigger signal.

6. The high voltage ride-through characteristics simulation system based on a dynamic reactive power compensation device according to claim 1, characterized in that: The hysteresis circuit is specifically used to compare the first addition signal with the preset threshold value of the hysteresis circuit; If the first added signal is greater than or equal to the threshold value of the preset hysteresis circuit, output a 1 signal; If the first added signal is smaller than the preset threshold value of the hysteresis circuit, a 0 signal is output.

7. The high voltage ride-through characteristics simulation system based on a dynamic reactive power compensation device according to claim 1, characterized in that: When the hysteresis signal changes from a 0 signal to a 1 signal, the sampling and holding circuit outputs the first clock signal as the hysteresis signal.

8. The high voltage ride-through characteristics simulation system based on a dynamic reactive power compensation device according to claim 1, characterized in that: When the hysteresis signal is a 1 signal, the first signal selection circuit outputs the second addition signal as the first selection signal; when the hysteresis signal is a 0 signal, the first signal selection circuit outputs a 0 signal as the first selection signal.

9. The high voltage ride-through characteristics simulation system based on a dynamic reactive power compensation device according to claim 1, characterized in that: When the first selection signal is the second addition signal and the second addition signal is greater than or equal to a threshold value of the second signal selection circuit, the second signal selection circuit outputs a 1 signal as the second selection signal; when the first selection signal is a 0 signal, the second signal selection circuit outputs a 0 signal as the second selection signal.

10. The high voltage ride-through characteristics simulation system based on a dynamic reactive power compensation device according to claim 4, characterized in that: When the high-through trigger signal is 1, the third signal selection circuit outputs the rated current of the dynamic reactive compensation device as the second mode current command signal; when the high-through trigger signal is less than 1, the third signal selection circuit outputs the reference value of the conventional control reactive current as the second mode current command signal.

11. The high voltage ride-through characteristics simulation system based on a dynamic reactive power compensation device according to claim 5, characterized in that: When the high-throughput mode switching signal is 1, the fourth signal selection circuit outputs the first mode current command signal as the third selection signal; when the high-throughput mode switching signal is 0, the fourth signal selection circuit outputs the second mode current command signal as the third selection signal.

12. The high voltage ride-through characteristics simulation system based on a dynamic reactive power compensation device according to claim 5, characterized in that: When the high-through trigger signal is 1, the fifth signal selection circuit outputs the third selection signal as the command value of the reactive current; when the high-through trigger signal is 0, the fifth signal selection circuit outputs the reference value of the conventional controlled reactive current as the command value of the reactive current.

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