CN103558471A - Method for measuring response time of straightly-hung type dynamic reactive generating devices with unified time scales - Google Patents

Abstract

The invention discloses a method for measuring the response time of straightly-hung type dynamic reactive generating devices with unified time scales. The problem that in the prior art, the response time of straightly-hung type dynamic reactive generating devices cannot be accurately measured is solved. The method includes the steps of selecting a current collection circuit with the largest load to serve as a first current collection circuit, enabling a breaker to be arranged between a low-voltage side bus and the first current collection circuit, operating the breaker to cut off the first current collection circuit, and completing sampling on response current waveforms and response voltage waveforms; in a computer, using a dispersed data effective value calculating tool to build a response time calculating model, setting the calculating time to be 800 milliseconds, generating smooth response process voltage and current effective value curves, and obtaining the accurate response time of the straightly-hung type dynamic reactive generating devices. The high-and-low-voltage side voltage and current waveforms of the straightly-hung type dynamic reactive generating devices can be measured, the measured data are accurate and reliable, and the method is particularly suitable for power grid sites.

Description

Measuring method of response time of direct-mounted dynamic var generator with unified time scale

technical field

The invention relates to a device and method for measuring the response time of a dynamic reactive power generation device connected in a power grid to system voltage disturbances.

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 disconnection 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 the wind farm dynamic reactive power generator. According to the relevant requirements, the response time of the direct-mounted dynamic var generator in the wind farm should be within 30 milliseconds, which requires an effective and true measurement of the response time of the direct-mounted dynamic var The performance of the direct-mounted dynamic var generator in the wind farm is evaluated. The existing measurement method relies on the direct-mounted dynamic var generator to send pulses to simulate the disturbance, which cannot reflect the real situation of the disturbance source, and cannot fully detect the linkage response of each part of the direct-mounted dynamic var generator. waveform, resulting in inaccurate measurement of the response time, which in turn leads to loss of authenticity in the performance evaluation of the direct-mounted dynamic var generator.

Contents of the invention

The invention provides a method for measuring the response time of a direct-mounted dynamic reactive power generating device with a unified time scale, which solves the problem of inaccurate measurement of the response time of the direct-mounted dynamic reactive power generating device in the prior art.

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

A device for measuring the response time of a direct-mounted dynamic reactive power generator with a unified time scale, including a high-voltage side bus, a low-voltage side bus, a direct-mounted dynamic reactive power generator and a waveform recorder, which are electrically connected to the high-voltage side bus. The transformer and the voltage transformer on the high-voltage side are electrically connected to the first collector line, the second collector line, the direct-mounted dynamic reactive power generating device and the voltage transformer on the low-voltage side respectively on the busbar on the low-voltage side. A circuit breaker is arranged between the collector lines, a first collector circuit current transformer is arranged on the first collector circuit, and the secondary side A phase of the first collector circuit current transformer is connected to the second current of the waveform recorder. The waveform input terminal is electrically connected, 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 electrically connected to the third current waveform input terminal of the waveform recorder , on the connection between the busbar and the direct-mounted dynamic reactive power generating device, a reactive power generating device is connected to the line current transformer, and the reactive power generating device is connected to the secondary side A phase of the line current transformer and the waveform recorder. The fourth current waveform input terminal is electrically connected, the transformer is provided with a current transformer on the high voltage side of the transformer, the secondary side A phase of the transformer high voltage side current transformer is electrically connected to the first current waveform input terminal of the waveform recorder, and the high voltage side voltage Phase A of the secondary side of the transformer is electrically connected to the first voltage waveform input terminal of the waveform recorder, and phase A of the secondary side of the voltage transformer on the low-voltage side is connected to the second, third, and fourth voltage waveform input terminals of the waveform recorder electrical connection.

The second, third and fourth voltage waveform input terminals of the waveform recorder are connected in parallel.

A method for measuring the response time of a direct-mounted dynamic var generating device with a unified time scale, 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 set between the low-voltage side busbar and the first collector line, and the first collector line current transformer is installed on the first collector line, and the secondary side of the first collector line current transformer is Phase A is electrically connected to the second current waveform input terminal of the waveform recorder, and a second collector line current transformer is installed on the second collector line, and the secondary side A phase of the second collector line current transformer is connected to the waveform recorder. The third current waveform input terminal of the instrument is electrically connected, and the reactive power generating device is connected to the line current transformer on the connection between the low-voltage side busbar and the direct-mounted dynamic reactive power generating device, and the reactive power generating device is connected to the line current mutual inductance Phase A of the secondary side of the transformer is electrically connected to the fourth current waveform input terminal of the waveform recorder, and a current transformer on the high voltage side of the transformer is installed on the transformer, and the phase A of the secondary side of the current transformer on the high voltage side of the transformer is connected to the waveform recorder. The first current waveform input terminal is electrically connected, and a high-voltage side voltage transformer is installed on the high-voltage side busbar, and the secondary side A phase of the high-voltage side voltage transformer is electrically connected to the first voltage waveform input terminal of the waveform recorder. A voltage transformer on the low-voltage side is installed on the bus, and the secondary side A phase of the voltage transformer on the low-voltage side is electrically connected to the second, third, and fourth voltage waveform input terminals of the waveform recorder. The wiring method described in this step ensures that each The waveforms of the measuring points are unified under the same time scale;

The third step is to set the waveform recorder according to the sudden change of the current when the circuit breaker on the first collector line is disconnected, and set the wave recording time to 800 milliseconds, and start the waveform recorder;

The fourth step is to operate the circuit breaker to cut off the first collector line. Start timing from the cut-off time, download the waveform recorder data after three minutes, and complete the sampling of the response current waveform and response voltage waveform;

The fifth step is to use the waveform analysis software to analyze the downloaded voltage and current waveform sampling data. Export and edit the sampling waveform in the form of discrete points, finally form an ASCII format data file, and import it into the computer;

Step 6. In the computer, use the "discrete data calculation effective value tool" to build a response time calculation model, set the calculation time to 800 milliseconds, and generate a smooth response process voltage and current effective value curve;

Step 7: Scale the effective value curve, take the system voltage exceeding the voltage qualified range as the response starting point, and take the output current of the direct-mounted dynamic reactive power generator reaching 90% of the target value as the response end point to obtain accurate direct Response time of hanging dynamic var generator.

The invention has the advantages of using active power disturbance to cause voltage and current reactive power fluctuations, simulating real system voltage disturbance, and can directly measure the direct-mounted dynamic reactive power generating device, collector line and high and low voltage sides of the transformer under the unified time scale The voltage and current waveforms, the test data are accurate and reliable, especially suitable for use on the grid site.

Description of drawings

Fig. 1 is the structural representation of detection circuit of the present invention;

Fig. 2 is a schematic diagram of the sampling data export file of the present invention;

Fig. 3 is a schematic diagram of a response time calculation model of the present invention;

Fig. 4 is a schematic diagram of the response time scale of the present invention.

Detailed ways

A device for measuring the response time of a direct-mounted dynamic reactive power generator with a unified time scale, including a high-voltage side bus 1, a low-voltage side bus 2, a direct-mounted dynamic reactive power generator 3 and a waveform recorder 4. The high-voltage side bus 1 A transformer 5 and a voltage transformer 6 on the high-voltage side are electrically connected to it, and a first collector line 7, a second collector line 8, a direct-mounted dynamic reactive power generator 3 and a low-voltage busbar 2 are electrically connected to the busbar 2 on the low-voltage side. side voltage transformer 9, a circuit breaker 10 is arranged between the low-voltage side bus 2 and the first collector line 7, a first collector circuit current transformer 11 is arranged on the first collector circuit 7, and the first collector circuit The secondary side A phase of the line current transformer 11 is electrically connected to the second current waveform input terminal of the waveform recorder 4, and a second current collector line current transformer 12 is arranged on the second collector circuit 8, and the second collector circuit current transformer 12 is arranged on the second collector circuit 8. The secondary side A phase of the line current transformer 12 is electrically connected to the third current waveform input terminal of the waveform recorder 4, and the connection line between the low-voltage side bus 2 and the direct-mounted dynamic var generator 3 is provided with or without The power generating device is connected to the line current transformer 13, and the reactive power generating device is connected to the secondary side A phase of the line current transformer 13 and is electrically connected to the fourth current waveform input terminal of the waveform recorder 4. The current transformer 14, the secondary side A phase of the transformer high voltage side current transformer 14 is electrically connected to the first current waveform input terminal of the waveform recorder 4, the secondary side A phase of the high voltage side voltage transformer 6 is connected to the waveform recorder 4 The first voltage waveform input terminal of the low voltage side voltage transformer 9 is electrically connected to the second, third and fourth voltage waveform input terminals of the waveform recorder 4 .

The second, third and fourth voltage waveform input terminals of the waveform recorder 4 are connected in parallel.

A method for measuring the response time of a vertically-mounted dynamic var generator with a unified time scale, comprising the following steps:

The first step is to select the collector line with the largest load as the first collector line 7, the active power of the first collector line 7 is required to be greater than 80% of the rated power, and then select another collector line in normal operation as the second collector line electrical line 8;

In the second step, a circuit breaker 10 is arranged between the low-voltage side busbar 2 and the first collector line 7, and a first collector circuit current transformer 11 is arranged on the first collector circuit 7 to convert the first collector circuit current The secondary side A phase of the transformer 11 is electrically connected to the second current waveform input terminal of the waveform recorder 4, and the second collector circuit current transformer 12 is arranged on the second collector circuit 8 to convert the second collector circuit current Phase A of the secondary side of the transformer 12 is electrically connected to the third current waveform input terminal of the waveform recorder 4, and a reactive power generating device is installed on the connection between the low-voltage side bus 2 and the direct-mounted dynamic reactive power generating device 3 Connect the line current transformer 13, electrically connect the secondary side A phase of the reactive power generator connected to the line current transformer 13 with the fourth current waveform input terminal of the waveform recorder 4, and set the transformer 5 on the high voltage side current transformer 14. Electrically connect the secondary side A phase of the high voltage side current transformer 14 of the transformer with the first current waveform input terminal of the waveform recorder 4, set the high voltage side voltage transformer 6 on the high voltage side bus bar 1, and connect the high voltage side voltage mutual inductor Phase A of the secondary side of the device 6 is electrically connected to the first voltage waveform input terminal of the waveform recorder 4, and a low-voltage side voltage transformer 9 is arranged on the bus bar 2 of the low-voltage side, and the phase A of the secondary side of the voltage transformer 9 of the low-voltage side It is electrically connected to the second, third, and fourth voltage waveform input terminals of the waveform recorder 4, and the wiring method described in this step ensures that the waveforms of each measuring point are unified under the same time scale;

The 3rd step, set waveform recorder 4 according to the sudden change of current when the circuit breaker 10 on the first collector line 7 is disconnected, and set the recording time as 800 milliseconds, start waveform recorder 4;

The fourth step is to operate the circuit breaker 10 to cut off the first collector line 7 . Start timing from the cut-off time, download the waveform recorder 4 data after three minutes, and complete the sampling of the response current waveform and response voltage waveform;

The fifth step is to use the waveform analysis software to analyze the downloaded voltage and current waveform sampling data. Export and edit the sampling waveform in the form of discrete points, finally form an ASCII format data file, and import it into the computer;

Step 6. In the computer, use the "discrete data calculation effective value tool" to build a response time calculation model, set the calculation time to 800 milliseconds, and generate a smooth response process voltage effective value curve 15 and current effective value curve 16;

The seventh step is to scale the voltage RMS curve 15 and the current RMS curve 16, take the system voltage exceeding the voltage qualified range as the response starting point 17, and use the direct-mounted dynamic reactive power generator to reach 90% of the target value. In order to respond to the end point 18, the precise response time of the direct-mounted dynamic var generator is obtained.

The device and method are based on a conventional waveform recorder and power system simulation software, with simple wiring forms and analysis methods, intuitive and accurate test results, and strong portability.

Claims (1)

1. A method for measuring the response time of a direct-mounted dynamic var generating device with unified time scale, comprising the following steps: The first step is to select the collector line with the largest load as the first collector circuit (7). The active power requirement of the first collector circuit (7) is greater than 80% of the rated power, and then select another collector circuit in normal operation. is the second collector line (8); In the second step, a circuit breaker (10) is installed between the low-voltage side busbar (2) and the first collector line (7), and a first collector line current transformer ( 11), electrically connect the secondary side A phase of the current transformer (11) of the first collector line to the second current waveform input terminal of the waveform recorder (4), and set the second current waveform input terminal on the second collector line (8) The second collector line current transformer (12), electrically connects the secondary side A phase of the second collector line current transformer (12) to the third current waveform input terminal of the waveform recorder (4), and connects it to the low-voltage side bus (2) Set the reactive power generating device connected to the line current transformer (13) on the connection between the direct-mounted dynamic reactive power generating device (3), and connect the reactive power generating device to the second terminal of the line current transformer (13). Phase A of the secondary side is electrically connected to the fourth current waveform input terminal of the waveform recorder (4), and a current transformer (14) on the high voltage side of the transformer is installed on the transformer (5). Phase A of the secondary side is electrically connected to the first current waveform input terminal of the waveform recorder (4), and a high-voltage side voltage transformer (6) is installed on the high-voltage side busbar (1), and the secondary side of the high-voltage side voltage transformer (6) The side A phase is electrically connected to the first voltage waveform input terminal of the waveform recorder (4), and the low-voltage side voltage transformer (9) is installed on the low-voltage side busbar (2), and the secondary voltage transformer (9) of the low-voltage side The side A phase is electrically connected to the second, third, and fourth voltage waveform input terminals of the waveform recorder (4), and the wiring method described in this step ensures that the waveforms of each measuring point are unified under the same time scale; The third step is to set the waveform recorder (4) according to the sudden change of current when the circuit breaker (10) on the first collector line (7) is disconnected, and set the recording time to 800 milliseconds, start the waveform recorder (4 ); Step 4: Operate the circuit breaker (10) to cut off the first current collector line (7), start timing from the time of cutting off, download the data of the waveform recorder (4) after three minutes, and complete the response current waveform and response voltage waveform sampling; Step 5. Use the waveform analysis software to analyze the downloaded voltage and current waveform sampling data; export and edit the sampling waveform in the form of discrete points, and finally form an ASCII format data file, and import it into the computer; Step 6. In the computer, use the "discrete data calculation effective value tool" to build a response time calculation model, set the calculation time to 800 milliseconds, and generate a smooth response process voltage effective value curve (15) and current effective value curve (16 ); Step 7: Scale the voltage RMS curve (15) and the current RMS curve (16), take the system voltage exceeding the voltage qualified range as the response starting point (17), and output the current with the direct-mounted dynamic reactive power generator Reaching 90% of the target value is the response end point (18), and the precise response time of the direct-mounted dynamic var generator is obtained.

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