Control method for drag test of power units of high voltage static reactive power compensation device

Abstract

The invention discloses a control method for a drag test of power units of a high voltage static reactive power compensation device. The method comprises the following steps of: (1) controlling a power unit A in the drag test; (2) controlling the power unit B in the drag test; and (3) reducing triple frequency harmonic content in the current. The control method has the beneficial effects that 1) the operation is simple, corresponding current can be output by setting different reactive currents, and the amplitude and the phase position of the output voltage are not needed to be repeatedly adjusted manually; 2) the cost is reduced; under the same current higher harmonic, a back-to-back structure needs two electric reactors, but the method only needs an electric reactor, and the capacity of the electric reactor of the method is half of that of the back-to-back structure; and 3) the triple frequency harmonic content in the current can be effectively reduced, and the current waveform can be improved.

Description

Technical field: [0001] The invention relates to a control method for a power unit towing test, in particular to a control method for a power unit towing test of a high-voltage static var compensation device, which is suitable for controlling the power of a high-voltage static var compensation device and a high-voltage frequency converter. The unit is tested for rated operating conditions. Background technique: [0002] In order to effectively verify whether the control, protection, temperature rise, electromagnetic compatibility, electrical parameter selection, installation, and connection process of the power unit meet the design requirements under the rated working condition, the power unit needs to conduct an operation test under the rated operating condition. [0003] The control system of the Chinese patent SVG link back-to-back complementary test device (application number 201120230665.3, application date is July 2, 2011, and announcement date is March 14, 2012) discl...

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Problems solved by technology

[0007] 3) The power unit of the H-bridge structure can increase the switching frequency of the output voltage to twice the switching frequency of the IGBT by inverting the modulated wave, thereby reducing the high-order harmonic components in the current, while the voltage across the reactor in the existing method The switching frequency is the switching frequency of the IGBT, which leads to a large increase in the high-order harmonic content in the current

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