Parallel pair-pushing test method of high-power power electronic converter and main loop

Abstract

The invention provides a parallel pair-pushing test method of a high-power power electronic converter and a main loop. The main loop is formed by connecting 2n converter units to be tested through a common direct current generatrix, wherein n is not less than 1; each converter unit to be tested comprises an alternating current side filter, a converter and a direct current generatrix capacitor group; one end of the alternating current side filter is connected with a three-phase grid, and the other end of the alternating current side filter is connected with an alternating current side of the converter; a direct current side of the converter is connected with the direct current generatrix capacitor group; and all converter units to be tested are connected in parallel with the direct current generatrix capacitor group through one end of a grid side of the alternating current side filter. According to the method, n converter units to be tested are controlled to operate as rectifiers, and the other n converter units to be tested are controlled to operate as inverters, high-power test on the converter under the condition of the limited grid capacity of a lab is realized by controlling a d-axis current given value of an inverter unit, and the aim of testing the performance such as temperature rise, efficiency and noise of the high-power power electronic converter is fulfilled.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular, to a parallel push test method and a main circuit of a high-power power electronic converter. Background technique [0002] In recent years, with the rapid development of high-power power electronics technology, more and more devices and equipment have been put into practical operation, such as flexible AC transmission and distribution system (FACTS), high voltage direct current transmission (HVDC), static reactive power compensation (STATCOM), Source power filter (APF), high-voltage inverter, various new energy grid-connected devices, etc. The operation practice shows that these devices can improve the flexibility of power grid operation control, power grid operation stability and power quality level without changing the grid structure of the power grid, and can effectively reduce the energy consumption of users. The national energy conservation and emission reduction p...

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Problems solved by technology

[0004] Literature (Zhang Yongxin, Yang Xijun, Jiang Jianguo. Research on the mutual-feed-to-drag test platform of permanent magnet synchronous motors [J]. Motor and Control Applications, 2010, 32 (2): 47-52.) proposed a shared DC bus servo Drive-PMSM mutual feed-to-drag test platform is used for performance testing of servo drives or permanent magnet synchronous motors. This method can use low-power power supplies to test higher-power transmission systems without the need for power supply expansion and transformation , and because the two sets of servo drive-PMSM systems share the DC bus and are connected coaxially, the energy is fed back inside the two, and the energy consumed by the entire system is the total loss of each part, which greatly improves the energy utilization rate, but this method requires two Three-phase AC motors with the same power are connected coaxially. This structure is somewhat redundant in the application where only the performance test of the high-power power electronic converter itself is required, and it increases the system loss.

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