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A factory full-load test method for large-capacity svg

A test method and large-capacity technology, applied in the power grid field, can solve the problems of high cost and limited utilization of the test platform, and achieve the effects of small footprint, simple structure and low cost

Active Publication Date: 2021-03-16
STATE GRID HUNAN ELECTRIC POWER +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method needs to configure the reactive power equipment with the same capacity as the tested SVG in the factory area. When the SVG capacity is small, the SVG products of other items can be used as the reactive power device due to the small capacity of the equipment under test or other items in the factory. , is still easy to realize; but if the SVG capacity reaches 100 megavar, because the number of such SVG projects is small, it may take several years to produce a set of devices, and it is difficult to find another SVG for power hedging. If the aforementioned hedging test platform is built for this device alone, the cost of the test platform is too high, and the utilization rate is also very limited

Method used

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  • A factory full-load test method for large-capacity svg
  • A factory full-load test method for large-capacity svg
  • A factory full-load test method for large-capacity svg

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Embodiment approach 1

[0024] First, the present embodiment discloses a method for testing full SVG large capacity, comprising: the SVG wherein the two phases short-circuited in series with the third line and the two-phase network, and then to be phase independent control SVG. The two phases are short-circuited configured to output constant current mode, and is a capacitive, an inductive power to achieve a two-phase short-circuiting between the hedge and without external current output, and connected to the internal short between two phases SVG load circuit corresponding to full rated current; At the same time, the third phase is configured to output a constant voltage mode, and the third phase output voltage is equal to the line voltage and outlets ports are shorted and the two-phase rated voltage vector phase difference.

[0025] To facilitate those skilled in the art to fully understand the present embodiment and the method of the above-described configuration architecture, described in further detai...

Embodiment approach 2

[0045] SVG typical power cells each phase DC bus voltage from the active current regulation components, its hardware wiring test with Embodiment 1, but different voltage and current control. This is because SVG valve power loss due to the switching process during operation, the device is turned on factors such as pressure drop inevitably produce active consumption, if we follow image 3 The voltage-current vector relationship regulation, and ports due to the current identically zero, so that the respective phases valve SVG absorption from the grid is not active, and the two-phase AB manifold due to its own power loss will hardly be unable to maintain a stable DC voltage.

[0046] At this time, SVG voltage and current of each phase of the valve may be controlled as follows: ①C valve phase power to a constant voltage output mode, the amplitude of the output voltage equal to the rated phase voltage and phase lag of the AC line voltage of approximately 150 °, thus the relationship betw...

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Abstract

The invention discloses a high capacity SVG factory full load test method comprising the following steps: short circuiting two phases of a complete set of SVG three-phase output ports, and enabling the short circuited two-phase and another phase to respectively connect with two phases of a power grid corresponding to a rated line voltage; controlling currents of short circuit two-phase branches tobe one capacitive and one inductance for alternate power hedging, and controlling the output voltage of the third phase to be equal to a vector difference between a grid connected point port line voltage and short circuited two-phase rated phase voltage; examining the full load power of the short circuited two-phase under a rated voltage and rated current. The method can carry out split-phase exam tests of the SVG under the rated voltage and rated current when the SVG output capacity is far smaller than a rated capacity, and no extra accompany equipment is needed, thus realizing large capacity SVG factory full load test under a limited factory power supply capacity; a test platform corresponding to the method is simple in structure and low in cost; the SVG test method is efficient and economic.

Description

Technical field [0001] The present invention relates to the technical field grid, particularly relates to a test method for SVG. Background technique [0002] With the rapid development of new energy power generation and UHV transmission technology, the demand for power system dynamic reactive compensation devices become increasingly urgent. Having a fast dynamic reactive power compensation capabilities of various types of reactive devices, static synchronous generator (Static Var Generator, SVG) by having a fast response time, small grid harmonics widespread concern. [0003] The basic principle is to SVG self-commutated bridge circuit directly or through a reactor in parallel in the power line, appropriately adjusting the phase and amplitude of the AC side of the bridge circuit output voltage, or directly control the alternating current side, it is possible that the circuit reactive current absorbed or emitted to meet the requirements to achieve the purpose of dynamic reactive ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/00
CPCG01R31/00
Inventor 陆佳政黄清军李波谭艳军毛新果朱思国朱远
Owner STATE GRID HUNAN ELECTRIC POWER
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