svg power unit self-test method

Abstract

The invention discloses an SVG power unit self-detection method. The SVG power unit self-detection method comprises the steps that a sequence switching signal is sent to an SVG power unit, and mid-point voltage of an H-bridge circuit of the SVG power unit is detected; whether the detected voltage is consistent with the voltage corresponding to the sequence switching signal or not is judged; if it is judged that the detected voltage is consistent with the voltage corresponding to the sequence switching signal, it is determined that components and parts of the SVG power unit are normal, otherwise, it is determined that the SVG power unit breaks down. By means of the technical scheme, the method is suitable for open circuiting or short circuiting of power parts of the SVG power unit or fault detection of a driving circuit of the SVG power unit in a high-voltage state, and the application range is enlarged.

Description

technical field [0001] The invention relates to the technical field of electric power detection, in particular to a method for self-inspection of an SVG power unit. Background technique [0002] In the prior art, a large amount of reactive power is required for the stable operation of the power system. In order to ensure the power quality, reactive power compensation is an important and effective method. High-voltage SVG (Static Var Generator, Static Var Generator) is mainly used in high-voltage, high-power transmission and distribution occasions. Its main function is to compensate the reactive power at the load end to improve the power factor at the load end, reduce the capacity of electrical equipment, and reduce the Minimize the active power loss of the transmission line, balance the three-phase power and maintain the voltage stability of the power system. [0003] Some of the existing SVG power units on the market cannot be self-inspected before operation, and the damag...

AI Technical Summary

Problems solved by technology

[0003] Some of the existing SVG power units on the market cannot be self-inspected before operation, and the damage to the circuit or components of the SVG power unit cannot be judged, which may easily lead to instability of the power system

Some of them only detect the open circuit of the power device IGBT (Insulated Gate Bipolar Transistor, insulated gate bipolar transistor), and it is difficult to preventively detect the open circuit, short circuit and gate drive failure of the power device IGBT before high voltage operation

There is also a part of the open circuit detection of the power device IGBT, which can realize the detection of the power device during operation, mainly through software algorithms, but the algorithm is relatively complicated, and can only be used in three-phase four-wire three-bridge-arm three-electric Open circuit detection is realized on products with a flat topology structure, and the scope of application is narrow

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