Voltage fault ride-through test method for static var generator

A static reactive power and voltage fault technology, applied in the field of power electronics, can solve the problems of high cost and difficulty in increasing the capacity of the power grid fault simulation test device.

Inactive Publication Date: 2019-11-05
SHENZHEN HOPEWIND ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is that, aiming at the problem that it is relatively difficult to increase the capacity of the power grid fault simulation test device and the cost is high, a method of static The reactive power generator voltage fault ride-through t...

Method used

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  • Voltage fault ride-through test method for static var generator
  • Voltage fault ride-through test method for static var generator
  • Voltage fault ride-through test method for static var generator

Examples

Experimental program
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Effect test

example 1

[0033] In this example (such as image 3 As shown), the capacity of the static var generator under test is 10kV / 10Mvar, the capacity of the power grid fault simulation test device is 10kV / 6MVA, the capacity of the grid disturbance generator is smaller than the capacity of the static var generator under test, and the capacity of the power grid fault generator under test When the reactive support current output during the voltage fault ride-through period is greater than the rated current of the grid fault simulation test device, according to the voltage fault ride-through test requirements, it will inevitably cause the grid disturbance generator to over-current and shut down, and the test work cannot be carried out. For example, when the voltage drops to When the rated voltage is 20%, the output reactive current of the grid disturbance generating device is 1.75 times of the rated current. Can adopt the testing method that the present invention proposes now, specifically compris...

example 2

[0044] In this example (such as Figure 4 As shown), the capacity of the static var generator under test is 35kV / 28Mvar, the capacity of the power grid disturbance generating device is 35kV / 10MVA, and the capacity of the power grid disturbance generating device is smaller than the capacity of the measured static var power generator. According to the normal test requirements, the power grid disturbance generating device The capacity must be shut down due to overcurrent, which makes the test work unable to be carried out. Can adopt the testing method that the present invention proposes now, specifically comprise following link:

[0045] Provide a test static var generator, such as 35kV / 20Mvar.

[0046] Connect the static var generator under test and the static var generator under test in parallel to the output terminal of the power grid disturbance generating device.

[0047] Install voltage and current sensors at the output of the power grid disturbance generator to detect Vp...

example 3

[0087] In this example (such as Figure 5As shown), the capacity of the static var generator under test is 35kV / 10Mvar, and the impedance divider device is used to simulate the power grid fault. The capacity of the impedance divider device is 35kV / 6MVA. According to the normal test requirements, the impedance voltage divider will be shut down due to an overcurrent fault, resulting in the inability to carry out the test work. Can adopt the testing method that the present invention proposes now, specifically comprise following link:

[0088] Provide a test static var generator, such as 10kV / 15Mvar, through a 10kV / 35kV 10MV step-up transformer to boost its terminal voltage to 35kV.

[0089] Connect the static var generator to be tested and the static var generator to be tested in parallel to the output end of the impedance divider.

[0090] Install voltage and current sensors at the output of the impedance divider to detect Vpcc0 and Ipcc0; set a current sensor at the input of ...

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Abstract

The invention relates to a voltage fault ride-through test method for a static var generator. The method specifically includes at least one static var generator for accompanying testing, the static var generators for accompanying testing and a to-be-tested static var generator are connected with the output end of a grid fault simulation test device in parallel, the reactive supporting current characteristics of the static var generators for accompanying testing under voltage fault ride-through are reversed, the reactive current output by the to-be-tested static var generators is offset partially or completely, so that the total current output by the grid fault simulation test device does not exceed the rated current of the grid fault simulation test device, and thus the purpose of reducingthe capacity requirement of the grid fault simulation test device and reducing the cost of a voltage fault ride-through test is achieved.

Description

technical field [0001] The present application relates to the technical field of power electronics, in particular to a static var generator voltage fault ride-through test method. Background technique [0002] Static var generators, as important equipment in new energy power stations, also need to meet the relevant grid-connected technical requirements and standards of new energy units. Among them, the uninterrupted operation of the static var generator and the support performance of the grid under low-voltage and high-voltage faults in the grid are important functional characteristics that the static var generator needs to possess. In order to confirm whether the response characteristics of the static var generator meet the standard under the low voltage and high voltage faults of the grid, it is necessary to conduct a formal test on the static var generator. [0003] Like wind turbines and photovoltaic power generation units, the test of low-voltage and high-voltage fault...

Claims

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Application Information

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IPC IPC(8): G01R31/00
CPCG01R31/00
Inventor 周党生龚李伟
Owner SHENZHEN HOPEWIND ELECTRIC CO LTD
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