CN103033700B - Detecting device of responding wave form of dynamic reactive power compensation equipment and detecting method of the same - Google Patents

Abstract

The invention discloses a response waveform test method of a dynamic reactive power compensation device, which solves the problem of distortion of first-hand sampling information in the test of the response time of the dynamic reactive power compensation device existing in the existing measuring device. Including the busbar (1), dynamic reactive power compensation device (7) and wave recorder (12), a circuit breaker (3) is set between the busbar (1) and the first collector line (2), the first collector Phase A of the secondary side of the line current transformer (4), phase A of the secondary side of the second current collector line current transformer (6), phase A of the secondary side of the current transformer (8) connected to the reactive power compensation device and the secondary side A phase of the transformer low-voltage side current transformer (10) are electrically connected with the current waveform input terminal of the wave recorder (12), and the secondary side A phase of the voltage transformer (11) is connected with the wave recorder (12) ) is electrically connected to the voltage waveform input terminal. The invention has accurate test and is suitable for being used on the grid site.

Description

Test method for response waveform of dynamic reactive power compensation device

technical field

The invention relates to a detection device and a detection method for the response waveform of a dynamic reactive power compensation device connected to a power grid to a disturbance source.

Background technique

After the large-scale connection of wind farms to the power grid, the application of a large number of power electronic devices has caused new problems to the power grid, especially the large-scale off-grid of wind power, which will have a serious impact on the power grid. In order to ensure the safe and stable operation of the system. New requirements are put forward for the response time of dynamic reactive power compensation devices in wind farms. According to the relevant requirements, the response time of the dynamic reactive power compensation device in the wind farm should be within 30 milliseconds, which requires effective and real testing of the response time of the dynamic reactive power compensation device The device is evaluated. The existing test method relies on the dynamic var compensation device to send pulses to simulate the disturbance, which cannot simulate the real situation of the disturbance source. In addition, the existing test device cannot fully detect the linkage of each part of the dynamic var compensation device. The response waveform leads to the distortion of the first-hand sampling information of the test of the response time of the dynamic var compensation device.

Contents of the invention

The invention provides a dynamic reactive power compensation device response waveform detection device and a testing method, which solves the problem in the prior art that the first-hand sampling information is distorted in the test of the response time of the dynamic reactive power compensation device.

The present invention solves the above problems through the following solutions:

A dynamic reactive power compensation device response waveform detection device, including a busbar, a dynamic reactive power compensation device and a wave recorder, the busbar is electrically connected with a first collector line, a second collector circuit, a transformer, a dynamic reactive power device and voltage transformer, a circuit breaker is arranged between the bus bar and the first collector line, a first collector circuit current transformer is arranged on the first collector circuit, and the secondary side of the first collector circuit current transformer Phase A is electrically connected to the first current waveform input terminal of the wave recorder, and a second collector line current transformer is arranged on the second collector line, and the secondary side A phase of the second collector line current transformer is connected to the wave recorder The second current waveform input terminal of the transformer is electrically connected, and a reactive power compensation device is connected to the line current transformer on the connection line between the bus bar and the dynamic reactive power compensation device, and the reactive power compensation device is connected to the secondary side of the line current transformer. Phase A is electrically connected to the third current waveform input terminal of the oscilloscope, and the transformer is provided with a transformer low-voltage side current transformer, and the secondary side A phase of the transformer low-voltage side current transformer is connected to the fourth current waveform input terminal of the oscilloscope. The terminals are electrically connected, and the secondary side A phase of the voltage transformer is electrically connected with the voltage waveform input terminal of the oscilloscope.

The four voltage waveform input terminals of the oscilloscope are connected in parallel.

A method for detecting a response waveform of a dynamic reactive power compensation device, comprising the following steps:

The first step is to select the collector line with the largest load as the first collector line, and then select another collector line in normal operation as the second collector line;

In the second step, a circuit breaker is installed between the bus bar and the first collector line, a first collector circuit current transformer is installed on the first collector circuit, and the secondary side A phase of the first collector circuit current transformer is It is electrically connected with the first current waveform input terminal of the oscilloscope, and a second collector line current transformer is arranged on the second collector line, and the secondary side A phase of the second collector line current transformer is connected to the oscilloscope. The second current waveform input terminal is electrically connected, and the reactive power compensation device is connected to the line current transformer on the connection line between the bus bar and the dynamic reactive power compensation device, and the reactive power compensation device is connected to the secondary side A phase of the line current transformer. It is electrically connected to the third current waveform input terminal of the oscilloscope, and a current transformer on the low-voltage side of the transformer is installed on the transformer, and the secondary side A phase of the current transformer on the low-voltage side of the transformer is electrically connected to the fourth current waveform input terminal of the oscilloscope. To connect, install a voltage transformer on the bus, and electrically connect the phase A of the secondary side of the voltage transformer to the voltage waveform input terminal of the oscilloscope;

The third step is to set the wave recorder according to the sudden change of current when the circuit breaker on the first collector line is disconnected, and set the wave recording time to 100 milliseconds;

The fourth step is to cut off the first collector line with a circuit breaker, start timing from the time of cutting off, start the wave recorder after 2-3 minutes, and complete the sampling of the response current waveform and response voltage waveform.

The invention has the advantages of making use of active power disturbances to cause voltage and current reactive power fluctuations, simulating real system reactive power disturbances, and directly measuring the dynamic reactive power compensation device, the linked response waveforms of the inductive part and the capacitive part, and the test is accurate and reliable, especially Suitable for use on the grid site.

Description of drawings

FIG. 1 is a schematic structural diagram of a detection circuit of the present invention.

Detailed ways

A dynamic reactive power compensation device response waveform detection device, comprising a bus 1, a dynamic reactive power compensation device 7 and a wave recorder 12, the bus 1 is electrically connected to a first collector line 2, a second collector circuit 5, A transformer 9, a dynamic reactive power compensation device 7 and a voltage transformer 11, a circuit breaker 3 is arranged between the bus bar 1 and the first collector line 2, and a current mutual inductance of the first collector circuit is arranged on the first collector circuit 2 device 4, the secondary side A phase of the first collector line current transformer 4 is electrically connected to the first current waveform input terminal of the wave recorder 12, and the second collector line current transformer is provided on the second collector line 5 6, the secondary side A phase of the second collector line current transformer 6 is electrically connected to the second current waveform input terminal of the wave recorder 12, and is set on the connecting line between the bus bar 1 and the dynamic reactive power compensation device 7 There is a reactive power compensation device connected to the line current transformer (8), the secondary side A phase of the reactive power compensation device connected to the line current transformer 8 is electrically connected to the third current waveform input terminal of the wave recorder 12, and is set on the transformer 9 There is a transformer low-voltage side current transformer 10, the secondary side A phase of the transformer low voltage side current transformer 10 is electrically connected to the fourth current waveform input terminal of the wave recorder 12, and the secondary side A phase of the voltage transformer 11 is connected to the wave recorder The voltage waveform input terminal of the device 12 is electrically connected.

The four voltage waveform input terminals of the oscilloscope 12 are connected in parallel.

A method for testing the response waveform of a dynamic reactive power compensation device, comprising the following steps:

The first step is to select the collector line with the largest load as the first collector line 2, and the rated capacity of the first collector line 2 is required to be more than 80%, and then select another collector line in normal operation as the second collector line 5;

In the second step, a circuit breaker 3 is arranged between the bus bar 1 and the first collector circuit 2, and a first collector circuit current transformer 4 is arranged on the first collector circuit 2, and the first collector circuit current transformer Phase A of the secondary side of 4 is electrically connected to the first current waveform input terminal of the wave recorder 12, and a second collector line current transformer 6 is arranged on the second collector line 5, and the second collector line current transformer Phase A of the secondary side of 6 is electrically connected to the second current waveform input terminal of the wave recorder 12, and a reactive power compensation device is connected to the line current transformer 8 on the connection between the bus bar 1 and the dynamic reactive power compensation device 7, The reactive power compensation device is connected to the secondary side A phase of the line current transformer 8 and the third current waveform input terminal of the wave recorder 12 is electrically connected, and the transformer low-voltage side current transformer 10 is set on the transformer 9, and the transformer low-voltage side current The secondary side A phase of the transformer 10 is electrically connected to the fourth current waveform input terminal of the wave recorder 12, and the voltage transformer 11 is arranged on the bus bar 1, and the secondary side A phase of the voltage transformer 11 is connected to the wave recorder 12 The voltage waveform input terminal is electrically connected;

The 3rd step, set wave recorder 12 according to the mutation amount of current when the current passage where the first collector line 2 is located is disconnected by circuit breaker 3, and set the wave recording time as 100 milliseconds;

The fourth step is to cut off the first collector line 2 with the circuit breaker 3, start timing from the time of cutting off, start the wave recorder 12 after 2-3 minutes, and complete the sampling of the response current waveform and the response voltage waveform.

The voltage phase difference and current phase difference selected to be connected to the oscilloscope 12 must be consistent, which is convenient for phase comparison and power calculation.

After checking that the wiring is correct, according to the disconnected first collector line 2, the outgoing line of the dynamic reactive power compensation device 7, the current of the second collector line 5 in normal operation, the low-voltage side current of the transformer 9 and the connected voltage transformation ratio Set up the wave recorder 12 .

The device and method are based on a conventional power quality testing instrument or a fault recording instrument, the wiring form is simple, and the test result is intuitive and accurate.

Claims (1)

1. A dynamic reactive power compensation device response waveform test method, comprising the following steps: The first step is to select the current collector line with the largest load as the first current collector line (2), and then select another normal operating current collector line as the second current collector line (5); Step 2: Install a circuit breaker (3) between the busbar (1) and the first collector line (2), and install a first collector line current transformer (4) on the first collector line (2) , connect the secondary side A phase of the current transformer (4) of the first collector line to the first current waveform input terminal of the wave recorder (12), and set the second collector on the second collector line (5) The electric line current transformer (6), electrically connects the secondary side A phase of the second collector line current transformer (6) to the second current waveform input terminal of the wave recorder (12), and connects the busbar (1) and The reactive power compensation device is connected to the line current transformer (8) on the connection between the dynamic reactive power compensation devices (7), and the reactive power compensation device is connected to the secondary side A phase of the line current transformer (8) and the wave recording The third current waveform input terminal of the transformer (12) is electrically connected, and the transformer (9) is provided with a current transformer (10) on the low-voltage side of the transformer, and the secondary side A phase of the transformer (10) on the low-voltage side current transformer (10) is connected to the wave recording The fourth current waveform input terminal of the transformer (12) is electrically connected, and a voltage transformer (11) is installed on the busbar (1), and the secondary side A phase of the voltage transformer (11) is connected to the voltage of the wave recorder (12). The waveform input terminal is electrically connected; The third step is to set the wave recorder (12) according to the sudden change of current when the circuit breaker (3) on the first collector line (2) is disconnected, and set the wave recording time to 100 milliseconds; Step 4: Use the circuit breaker (3) to cut off the first collector line (2), start timing from the time of cutting off, start the wave recorder (12) after 2-3 minutes, and complete the sampling of the response current waveform and response voltage waveform .