CN112269087A - High-low voltage ride through capability detection system of reactive power compensation device - Google Patents
High-low voltage ride through capability detection system of reactive power compensation device Download PDFInfo
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Abstract
The invention is suitable for the technical field of voltage ride through performance detection, and provides a high and low voltage ride through capability detection system of a reactive power compensation device, which comprises the following components: the device comprises a fault simulation module and a data recording and analyzing module, wherein the fault simulation module is connected with the reactive power compensation device to be tested, and the data recording and analyzing module is respectively connected with the fault simulation module and the reactive power compensation device to be tested. The fault simulation module generates a secondary voltage simulation signal and sends the secondary voltage simulation signal to the reactive power compensation device to be tested; the reactive power compensation device to be detected outputs corresponding secondary reactive current according to the secondary voltage analog signal, the data recording and analyzing module collects the secondary voltage analog signal and the secondary reactive current, and the high-low voltage ride through capability of the reactive power compensation device to be detected is detected according to the secondary reactive current and the secondary voltage analog signal. The invention can avoid detecting the high-low voltage ride through capability of the reactive power compensation device to be detected at the high-voltage side and improve the safety.
Description
Technical Field
The invention belongs to the technical field of voltage ride through performance detection, and particularly relates to a high and low voltage ride through capability detection system of a reactive power compensation device.
Background
With the development of social economy, new energy resources such as photovoltaic energy, wind power and the like with the characteristics of cleanness, high efficiency and reproducibility occupy larger and larger proportions in energy consumption structures. For a power grid including new energy power generation, the grid-connected new energy unit is required to have high and low voltage ride through capability, so that the problem that when the power grid fails, the new energy unit is disconnected in a passive protection mode, the recovery difficulty of the whole power grid system is increased, and even the power grid is broken down is solved.
The high-low voltage ride through means that when the voltage of a grid-connected point of a new energy source unit rises or falls, the new energy source unit can be kept in grid connection for a period of time, even a certain reactive power is provided for a power grid, and the power grid is supported to recover until the power grid recovers to be normal, so that the high-low voltage ride through is realized.
The reactive power compensation device is an important device for maintaining stable operation of a power grid including new energy power generation, and can generate reverse reactive current with the same magnitude required in the power grid so as to realize reactive power compensation and keep the voltage of the power grid stable. Therefore, the reactive power compensation device should have the same high-low voltage ride through capability as the new energy source unit.
At present, the detection of the high and low voltage ride through capability of the reactive power compensation device is generally completed by adopting a large-scale high and low voltage ride through detection system, the large-scale high and low voltage ride through detection system has large volume and difficult transportation, detection test development needs to be carried out on a 35kV or 10kV high-voltage side, the problems of difficult wiring, large safety risk and long detection time exist, and the detection system for the high and low voltage ride through capability of the reactive power compensation device is urgently needed to overcome the problems.
Disclosure of Invention
In view of this, the embodiment of the present invention provides a high-low voltage ride through capability detection system for a reactive power compensation device, so as to solve the problems that the high-low voltage ride through capability detection system for the reactive power compensation device in the prior art is large in size, difficult in wiring for carrying out a detection test on a high voltage side, and high in safety risk.
A first aspect of an embodiment of the present invention provides a high-low voltage ride through capability detection system for a reactive power compensation device, including: the fault simulation module and the data recording and analyzing module;
one end of the fault simulation module is connected with a grid-connected point secondary voltage acquisition end of the reactive power compensation device to be tested, the other end of the fault simulation module is connected with one end of the data recording and analyzing module, and the other end of the data recording and analyzing module is connected with a secondary current output end of the reactive power compensation device to be tested;
the fault simulation module generates a secondary voltage simulation signal and sends the secondary voltage simulation signal to the reactive power compensation device to be tested; the reactive power compensation device to be tested outputs corresponding secondary reactive current according to the secondary voltage analog signal; and the data recording and analyzing module acquires the secondary voltage analog signal and the secondary reactive current and detects the high-low voltage ride through capability of the reactive compensation device to be detected according to the secondary reactive current and the secondary voltage analog signal.
Optionally, the secondary voltage analog signal includes a step-down analog signal; the voltage reduction analog signal is a signal which is generated by the fault analog module and has a reduced voltage value in a certain time period;
the detecting the high-low voltage ride through capability of the reactive power compensation device to be detected according to the secondary reactive current and the secondary voltage analog signal comprises the following steps:
and detecting the low voltage ride through capability of the reactive power compensation device to be detected based on the duration of the secondary reactive current corresponding to the voltage reduction analog signal and the duration of the voltage reduction analog signal.
Optionally, the step-down analog signal includes a plurality of first analog signals; the reduction amplitude of the voltage value of each first analog signal is different.
Optionally, the secondary voltage analog signal includes a boost analog signal; the boosting analog signal is a signal generated by the fault analog module and having a voltage value increased within a certain time period;
the detecting the high-low voltage ride through capability of the reactive power compensation device to be detected according to the secondary reactive current and the secondary voltage analog signal comprises the following steps:
and detecting the high voltage ride through capability of the reactive power compensation device to be detected based on the duration of the secondary reactive current corresponding to the boosting analog signal and the duration of the boosting analog signal.
Optionally, the boost analog signal includes a plurality of second analog signals; the rising amplitudes of the voltage values of the second analog signals are different.
Optionally, the fault simulation module is a voltage disturbance generation device; the data recording and analyzing module is a data recording analyzer.
Optionally, the voltage disturbance generating device is a three-phase four-wire output voltage disturbance generating device.
Optionally, the voltage output range of the voltage disturbance generating device with three-phase four-wire output is greater than 0V to 135V;
the voltage output error of the three-phase four-wire output voltage disturbance generating device is less than or equal to 0.1%;
the phase output range of the voltage disturbance generating device with three-phase four-wire output is 0-360 degrees;
the phase output error of the voltage disturbance generating device with three-phase four-wire output is less than or equal to 0.1 degree.
Optionally, the sampling frequency of the data recording analyzer is greater than or equal to 20 kHz.
Optionally, the bandwidth of the data recording analyzer is greater than or equal to 2.5 kHz.
Compared with the prior art, the embodiment of the invention has the following beneficial effects: one end of the fault simulation module is connected with a grid-connected point secondary voltage acquisition end of the reactive power compensation device to be detected, the other end of the fault simulation module is connected with one end of the data recording and analyzing module, the other end of the data recording and analyzing module is connected with a secondary current output end of the reactive power compensation device to be detected, a secondary voltage simulation signal is generated by the fault simulation module, the secondary voltage simulation signal and the secondary reactive current output by the reactive power compensation device to be detected are acquired by the data recording and analyzing module, and then the high and low voltage ride through capability of the reactive power compensation device to be detected can be detected according to the secondary reactive current and the secondary voltage simulation signal. The safety of the high-low voltage ride through capability detection work of the reactive power compensation device is improved.
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In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
Fig. 1 is a wiring diagram of a reactive power compensation device and a power grid including a new energy station in the prior art provided by an embodiment of the present invention;
fig. 2 is a wiring diagram of a high-low voltage ride through capability detection system of a reactive power compensation device provided by an embodiment of the invention;
FIG. 3 is a schematic illustration of low voltage ride through requirements for a wind farm provided by an embodiment of the present invention;
FIG. 4 is a schematic diagram of data analysis of a grid-connected point secondary voltage reduced to 20V in a wind power plant according to an embodiment of the invention;
FIG. 5 is a schematic diagram of data analysis of a grid-connected point secondary voltage reduced to 40V in a wind power plant according to an embodiment of the invention;
FIG. 6 is a schematic diagram of data analysis of a grid-connected point secondary voltage reduced to 60V in a wind power plant according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of data analysis of a grid-connected point secondary voltage reduced to 80V in a wind power plant according to an embodiment of the invention;
FIG. 8 is a schematic diagram of data analysis of a grid-connected point secondary voltage reduced to 90V in a wind power plant according to an embodiment of the present invention;
FIG. 9 is a schematic diagram of the low voltage ride through requirements of a photovoltaic power plant provided by an embodiment of the present invention;
FIG. 10 is a schematic diagram of data analysis of a grid-connected point secondary voltage increased to 105V in a wind power plant according to an embodiment of the invention;
FIG. 11 is a schematic diagram of data analysis of a grid-connected point secondary voltage increased to 109V in a wind power plant according to an embodiment of the invention;
FIG. 12 is a schematic diagram of data analysis of a grid-connected point secondary voltage increased to 111V in a wind farm provided by the embodiment of the invention.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular system structures, techniques, etc. in order to provide a thorough understanding of the embodiments of the invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.
In order to explain the technical means of the present invention, the following description will be given by way of specific examples.
As shown in fig. 1, a voltage transformer (PT) is a special transformer that converts a high voltage into a lower voltage according to a predetermined ratio. A Current Transformer (CT) is an electrical device that converts a large current into a small current in a prescribed ratio.
In the prior art, a reactive power compensation device is connected to a power grid including a new energy station through a PT1 and a CT1 on a main transformer 35kV side and a PT2 and a CT2 on a main transformer 110kV side, wherein the reactive power compensation device can collect a grid-connected point secondary voltage and a grid-connected point secondary current of the power grid including the new energy station according to the PT2 and the CT2, and judge a reactive current required to be provided according to the grid-connected point secondary voltage and the grid-connected point secondary current collected by the PT2 and the CT 2. After the reactive power compensation device provides reactive current for a power grid comprising a new energy station, the output primary reactive current can be converted into secondary reactive current through the CT1, and then the secondary reactive current output by the reactive power compensation device is acquired.
The accuracy of PT1, CT1, PT2 and CT2 can be not less than 0.2 level, so that the grid-connected point secondary voltage and the grid-connected point secondary current can be acquired and converted accurately.
For example, the reactive power compensation device may be a Static Var Generator (SVG), which is also called a high-voltage dynamic reactive power compensation Generator, or a Static synchronous compensator, in which a self-phase-changing bridge circuit is connected to a power grid through a reactor or directly in parallel, so as to adjust the phase and amplitude of the output voltage at the ac side of the bridge circuit, or directly control the current at the ac side thereof, so that the circuit absorbs or emits reactive power meeting the requirement, thereby achieving the purpose of dynamic reactive power compensation. SVG is the best solution in the field of reactive power control at present. Compared with the traditional phase modulators, capacitor reactors, traditional Static Var Compensators (SVCs) mainly represented by Thyristor Controlled Reactors (TCRs) and other modes, the SVG has incomparable advantages. Therefore, the SVG is widely applied to new energy stations, not only overcomes the problems of high maintenance cost and slow response speed of the early traditional reactive power compensation device, but also can realize continuous regulation of reactive power, and has the functions of inhibiting voltage unbalance, current harmonic waves and the like.
Referring to fig. 2, the system for detecting the high-low voltage ride through capability of the reactive power compensation device according to the embodiment of the present invention includes: the device comprises a fault simulation module and a data recording and analyzing module.
One end of the fault simulation module is connected with a grid-connected point secondary voltage acquisition end C of the reactive power compensation device to be detected, the other end of the fault simulation module is connected with one end of the data recording and analyzing module, and the other end of the data recording and analyzing module is connected with a secondary current output end A of the reactive power compensation device to be detected.
The fault simulation module generates a secondary voltage simulation signal and sends the secondary voltage simulation signal to the reactive power compensation device to be tested; the reactive power compensation device to be tested outputs corresponding secondary reactive current according to the secondary voltage analog signal; and the data recording and analyzing module acquires a secondary voltage analog signal and a secondary reactive current and detects the high-low voltage ride through capability of the reactive compensation device to be detected according to the secondary reactive current and the secondary voltage analog signal.
In the embodiment of the invention, when the reactive power compensation device to be tested actually works, the reactive current output by the reactive power compensation device to be tested is adjusted through the grid-connected point secondary voltage output by the PT2 acquired by the grid-connected point secondary voltage acquisition terminal C, so that a secondary voltage analog signal is generated through the fault analog module to simulate the increase or decrease of the grid-connected point secondary voltage, and then the secondary reactive current output by the reactive power compensation device to be tested is acquired through the data recording and analyzing module, so that the corresponding high-low voltage ride-through capability of the reactive power compensation device to be tested when the grid-connected point secondary voltage increases or decreases can be judged. According to the embodiment of the invention, one end of the fault simulation module is connected with the grid-connected point secondary voltage acquisition end of the reactive power compensation device to be detected, the other end of the fault simulation module is connected with one end of the data recording and analyzing module, the other end of the data recording and analyzing module is connected with the secondary current output end of the reactive power compensation device to be detected, a secondary voltage simulation signal is generated by the fault simulation module to simulate the increase or decrease of the secondary voltage of the grid-connected point, and then the high-low voltage ride through capability of the reactive power compensation device to be detected is detected according to the corresponding secondary reactive current when the secondary voltage of the grid-connected point is increased or decreased, so that the high-low voltage ride through capability of the reactive power compensation device to be detected on the high-voltage side can be avoided, the wiring mode of the high-low voltage ride through.
Optionally, the secondary voltage analog signal may include a buck analog signal. The voltage reduction analog signal is a signal generated by the fault analog module and the voltage value of which is reduced in a certain time period.
Wherein, detect reactive power compensator's that awaits measuring high-low voltage ride through ability according to secondary reactive current and secondary voltage analog signal, can include: and detecting the low voltage ride through capability of the reactive power compensation device to be detected based on the duration of the secondary reactive current corresponding to the voltage reduction analog signal and the duration of the voltage reduction analog signal.
Optionally, the step-down analog signal may include a plurality of first analog signals; the reduction amplitude of the voltage value of each first analog signal is different.
For example, the new energy farm may include a wind farm, and based on the low voltage ride through requirement of the wind farm shown in fig. 3, signals that the grid-connected point secondary voltage is reduced to 20V, 40V, 60V, 80V, and 90V may be generated by the fault simulation module, that is, the first analog signals are signals of 20V, 40V, 60V, 80V, and 90V, where the fault simulation module may simulate a single-phase grid-connected point secondary voltage reduction in the wind farm, and may also simulate a three-phase grid-connected point secondary voltage reduction in the wind farm, and correspondingly, according to the low voltage ride through requirement of the wind farm, the duration of each first analog signal may be determined to be 0.625s, 1.02s, 1.41s, 1.80s, and 2.00 s. Referring to fig. 4 to 8, Uab is a primary voltage of a grid-connected point, and may be obtained by transformation ratio conversion of a first analog signal 20V, 40V, 60V, 80V, or 90V and PT2, U0 is a reference voltage 0.000kV, 7.6716kV represents a voltage value represented by each vertical cell, IA2 represents a primary reactive current output by the reactive compensation device to be tested, and may be obtained by transformation ratio conversion of a secondary reactive current corresponding to the first analog signal and CT1, IA0 is a reference current 0.000A, 5.2777a, 4.2221a, or 3.3777a represents a current value represented by each vertical cell. When the duration of the IA2 is longer than that of the corresponding first analog signal, the low voltage ride through capability of the reactive power compensation device to be tested in the wind power plant meets the requirement, otherwise, the requirement is not met.
For example, the new energy plant may also include a photovoltaic power station, and based on the low voltage ride through requirement of the photovoltaic power station shown in fig. 9, signals that the grid-connected point secondary voltage is reduced to 0V, 20V, 40V, 60V, 80V, and 90V may be generated by the fault simulation module, that is, the first analog signals are signals of 0V, 20V, 40V, 60V, 80V, and 90V, and similarly, the fault simulation module may simulate a single-phase grid-connected point secondary voltage reduction in the photovoltaic power station, and may also simulate a three-phase grid-connected point secondary voltage reduction in the photovoltaic power station, and correspondingly, according to the low voltage ride through requirement of the photovoltaic power station, the duration of each first analog signal may be determined to be 0.15s, 0.625s, 1.02s, 1.41s, 1.80s, and 2.00 s. The method comprises the steps that each first analog signal, the duration time of each first analog signal, the secondary reactive current corresponding to each first analog signal and the duration time of the secondary reactive current corresponding to each first analog signal are recorded through a data recording and analyzing module, the first analog signals are converted into grid-connected point primary voltage through the transformation ratio of PT2 and the transformation ratio of CT1, the secondary reactive current corresponding to the first analog signals is converted into primary reactive current, when the duration time of the primary reactive current is longer than the duration time of the corresponding first analog signal, the low voltage ride through capability of a reactive compensation device to be tested in the photovoltaic power station meets requirements, and otherwise, the low voltage ride through capability of the reactive compensation device to be tested in the photovoltaic power station does not meet the requirements.
Optionally, the secondary voltage analog signal may comprise a boost analog signal. The boost analog signal is a signal generated by the fault analog module and the voltage value of which is increased within a certain time.
Wherein, detect reactive power compensator's that awaits measuring high-low voltage ride through ability according to secondary reactive current and secondary voltage analog signal, can include: and detecting the high voltage ride through capability of the reactive power compensation device to be detected based on the duration of the secondary reactive current corresponding to the boosting analog signal and the duration of the boosting analog signal.
Optionally, the boosted analog signal may include a plurality of second analog signals; the rising amplitudes of the voltage values of the second analog signals are different.
For example, according to the high voltage ride through requirement of the wind farm, signals of secondary voltage increase of grid-connected points to 105V and 109V may be generated by the fault simulation module, that is, the second analog signals are signals of 105V and 109V, similarly, the fault simulation module may simulate the secondary voltage increase of single-phase grid-connected points in the wind farm, and may also simulate the secondary voltage increase of three-phase grid-connected points in the wind farm, and correspondingly, according to the high voltage ride through requirement of the wind farm, the duration of each second analog signal may be determined to be 1800s and 1800 s. Referring to fig. 10 and 11, similarly, Uab is a primary voltage of a grid-connected point, and can be obtained by conversion of a second analog signal of 105V or 109V and transformation ratio of PT2, U0 is reference voltage of 0.000kV, 4.9098kV and 3.9278kV represent voltage values represented by each vertical cell, IA2 represents a primary reactive current output by the reactive compensation device to be tested, and can be obtained by conversion of a secondary reactive current corresponding to the second analog signal and transformation ratio of CT1, IA0 is reference current of 0.000A, and 4.2221a represents current values represented by each vertical cell. And when the duration of the IA2 is longer than that of the corresponding second analog signal, the high voltage ride through capability of the reactive power compensation device to be tested in the wind power plant meets the requirement, otherwise, the requirement is not met.
For example, according to the high voltage ride through requirement of the wind farm, a signal that the secondary voltage of the grid-connected point is increased to 111V, that is, a second analog signal is a 111V signal, may be generated by the fault simulation module, where the fault simulation module may simulate the increase of the secondary voltage of the single-phase grid-connected point in the wind farm, or may simulate the increase of the secondary voltage of the three-phase grid-connected point in the wind farm, and correspondingly, according to the high voltage ride through requirement of the wind farm, the duration of the second analog signal may be determined to be 10 s. Referring to fig. 12, similarly, Uab is a primary voltage of a grid-connected point, and may be obtained by transformation ratio conversion of second analog signals 111V and PT2, U0 is a reference voltage 0.000kV, 4.9098kV represents a voltage value represented by each vertical cell, IA2 represents a primary reactive current output by the reactive compensation device to be tested, and may be obtained by transformation ratio conversion of a secondary reactive current corresponding to the second analog signal and CT1, IA0 is a reference current 0.000A, and 3.3777a represents a current value represented by each vertical cell. When the secondary voltage of the grid-connected point in the wind power plant rises to 111V, the reactive power compensation device to be tested in the wind power plant is allowed to stop running immediately.
For example, according to the high voltage ride through requirement of the photovoltaic power station, signals of secondary voltage increase of grid-connected points to 109V, 115V, and 125V may be generated by the fault simulation module, that is, the second analog signals are signals of 109V, 115V, and 125V, similarly, the fault simulation module may simulate the secondary voltage increase of single-phase grid-connected points in the photovoltaic power station, and may also simulate the secondary voltage increase of three-phase grid-connected points in the photovoltaic power station, and correspondingly, according to the high voltage ride through requirement of the photovoltaic power station, the duration of each second analog signal may be determined to be 20s, 10s, and 0.5 s. And recording each second analog signal, the duration of each second analog signal, the secondary reactive current corresponding to each second analog signal and the duration of the secondary reactive current corresponding to each second analog signal through a data recording and analyzing module, converting the second analog signals into a grid-connected point primary voltage through the transformation ratio of PT2 and the transformation ratio of CT1, converting the secondary reactive current corresponding to the second analog signals into a primary reactive current, and when the duration of the primary reactive current is longer than the duration of the corresponding second analog signal, the high-voltage ride-through capability of the reactive compensation device to be tested in the photovoltaic power station meets the requirement, otherwise, the high-voltage ride-through capability of the reactive compensation device to be tested in the photovoltaic power station does not meet the requirement.
Illustratively, according to the high voltage ride-through requirement of the photovoltaic power station, a signal that the secondary voltage of the grid-connected point is increased to 131V, that is, the second analog signal is a signal of 131V, may be generated by the fault simulation module, where the fault simulation module may simulate the secondary voltage increase of a single-phase grid-connected point in the photovoltaic power station, and may also simulate the secondary voltage increase of a three-phase grid-connected point in the photovoltaic power station, and correspondingly, according to the high voltage ride-through requirement of the photovoltaic power station, the duration of the second analog signal may be determined to be 0.2 s. The data recording and analyzing module records the second analog signal, the duration of the second analog signal, the secondary reactive current corresponding to the second analog signal and the duration of the secondary reactive current corresponding to the second analog signal, the second analog signal is converted into a primary voltage of a grid-connected point through the transformation ratio of PT2 and the transformation ratio of CT1, the secondary reactive current corresponding to the second analog signal is converted into a primary reactive current, and when the secondary voltage of the grid-connected point in the photovoltaic power station is increased to 131V, the reactive compensation device to be tested in the photovoltaic power station is allowed to stop running immediately.
Optionally, the fault simulation module may be a voltage disturbance generation device, and the voltage disturbance generation device may be a three-phase four-wire output voltage disturbance generation device.
The voltage output range of the voltage disturbance generating device with three-phase four-wire output can be wider than 0V-135V; the voltage output error of the three-phase four-wire output voltage disturbance generation device can be less than or equal to 0.1%; the phase output range of the voltage disturbance generating device with three-phase four-wire output can be 0-360 degrees; the phase output error of the voltage disturbance generating device with three-phase four-wire output can be less than or equal to 0.1 degrees, the signal generating cycle of the voltage disturbance generating device with three-phase four-wire output can not exceed 100ms, and voltage curve editing can be carried out.
Optionally, the data recording and analyzing module may be a data recording analyzer.
The sampling frequency of the data recording analyzer can be greater than or equal to 20kHz, and the bandwidth of the data recording analyzer can be greater than or equal to 2.5 kHz.
The high and low voltage ride through capability detection system of the reactive power compensation device is connected with a grid-connected point secondary voltage acquisition end of the reactive power compensation device to be detected through one end of the fault simulation module, the other end of the fault simulation module is connected with one end of the data recording and analyzing module, the other end of the data recording and analyzing module is connected with a secondary current output end of the reactive power compensation device to be detected, the fault simulation module is utilized to generate a plurality of first analog signals and a plurality of second analog signals to simulate the rise or fall of the secondary voltage of the grid-connected point, and then the high and low voltage ride through capability of the reactive power compensation device to be detected is detected according to the corresponding secondary reactive current when the secondary voltage of the grid-connected point rises or falls, so that the high and low voltage ride through capability of the reactive power compensation device to be detected on a high voltage side can be avoided, the wiring mode of the high and low voltage ride through capability detection, the problems that a high-voltage ride-through capability detection system of a traditional reactive power compensation device is large in size, difficult to transport and long in detection time are solved.
In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and reference may be made to the related descriptions of other embodiments for parts that are not described or illustrated in a certain embodiment.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.
Claims (10)
1. A high and low voltage ride through capability detection system of a reactive power compensation device is characterized by comprising: the fault simulation module and the data recording and analyzing module;
one end of the fault simulation module is connected with a grid-connected point secondary voltage acquisition end of the reactive power compensation device to be tested, the other end of the fault simulation module is connected with one end of the data recording and analyzing module, and the other end of the data recording and analyzing module is connected with a secondary current output end of the reactive power compensation device to be tested;
the fault simulation module generates a secondary voltage simulation signal and sends the secondary voltage simulation signal to the reactive power compensation device to be tested; the reactive power compensation device to be tested outputs corresponding secondary reactive current according to the secondary voltage analog signal; and the data recording and analyzing module acquires the secondary voltage analog signal and the secondary reactive current and detects the high-low voltage ride through capability of the reactive compensation device to be detected according to the secondary reactive current and the secondary voltage analog signal.
2. The reactive power compensation device high-low voltage ride through capability detection system of claim 1, wherein the secondary voltage analog signal comprises a buck analog signal; the voltage reduction analog signal is a signal which is generated by the fault analog module and has a reduced voltage value in a certain time period;
the detecting the high-low voltage ride through capability of the reactive power compensation device to be detected according to the secondary reactive current and the secondary voltage analog signal comprises the following steps:
and detecting the low voltage ride through capability of the reactive power compensation device to be detected based on the duration of the secondary reactive current corresponding to the voltage reduction analog signal and the duration of the voltage reduction analog signal.
3. The reactive power compensation device high and low voltage ride through capability detection system of claim 2, wherein the step-down analog signal comprises a plurality of first analog signals, and the step-down amplitude of the voltage value of each first analog signal is different.
4. The reactive power compensation device high and low voltage ride through capability detection system of claim 1, wherein the secondary voltage analog signal comprises a boost analog signal; the boosting analog signal is a signal generated by the fault analog module and having a voltage value increased within a certain time period;
the detecting the high-low voltage ride through capability of the reactive power compensation device to be detected according to the secondary reactive current and the secondary voltage analog signal comprises the following steps:
and detecting the high voltage ride through capability of the reactive power compensation device to be detected based on the duration of the secondary reactive current corresponding to the boosting analog signal and the duration of the boosting analog signal.
5. The high-low voltage ride through detection system of a reactive power compensation device of claim 4, wherein the boost analog signal comprises a plurality of second analog signals; the rising amplitudes of the voltage values of the second analog signals are different.
6. The high-low voltage ride-through capability detection system of the reactive power compensation device of any one of claims 1 to 5, wherein the fault simulation module is a voltage disturbance generation device; the data recording and analyzing module is a data recording analyzer.
7. The high and low voltage ride through capability detection system of a reactive power compensation device of claim 6, wherein the voltage disturbance generation device is a three-phase four-wire output voltage disturbance generation device.
8. The high and low voltage ride through capability detection system of the reactive power compensation device of claim 7,
the voltage output range of the voltage disturbance generating device with three-phase four-wire output is more than 0V-135V;
the voltage output error of the three-phase four-wire output voltage disturbance generating device is less than or equal to 0.1%;
the phase output range of the voltage disturbance generating device with three-phase four-wire output is 0-360 degrees;
the phase output error of the voltage disturbance generating device with three-phase four-wire output is less than or equal to 0.1 degree.
9. The high and low voltage ride through detection system of a reactive power compensation device of claim 6, wherein the sampling frequency of the data recording analyzer is greater than or equal to 20 kHz.
10. The reactive power compensation apparatus high and low voltage ride through capability detection system of claim 9, wherein the bandwidth of the data recording analyzer is greater than or equal to 2.5 kHz.
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