A chained svg device with automatic restart function on failure

Abstract

A chain type SVG device with a fault automatic restart function is provided. The chain type SVG device comprises a main controller module, an SVG power module with an H-bridge circuit, a main switch, a first fault detection module, a troubleshooting module and a state confirmation module; the first fault detection module is used for performing fault detection on the operation state of a power grid and an SVG device; when the main controller module detects that the first fault detection module is abnormal, the main controller module sends locking signals for switching off the H-bridge circuit to the SVG power module and drives the troubleshooting module to be put into operation, until the first fault detection module becomes normal; and when the main controller module detects that the first fault detection module becomes normal, the main controller module sends locking releasing signals for switching on the H-bridge circuit to the SVG power module. According to the chain type SVG device with the fault automatic restart function of the invention adopted, the SVG device can automatically restart after a fault occurs, and the whole restart process is very fast without manual processing required.

Description

technical field [0001] The invention relates to a chained SVG device, in particular to a chained SVG device with a fault automatic restart function. Background technique [0002] Chained SVG device (static var generator) is a dynamic reactive power compensation device applied to 3kV-35kV voltage level, which has the advantages of small output harmonics, low operating loss, high modularity and fast response speed, etc. At present, it is widely used in wind power, coal mine, metallurgy and power grid and other fields, and has gradually replaced SVC device as the preferred technical solution of the latest generation of high-voltage dynamic reactive power compensation device. Existing chained SVG devices generally include a main switch, an SVG power module, and a main controller, among which the SVG power module is composed of multiple H-bridge power units, and the main controller adjusts the H by controlling the drive board in the H-bridge power unit. The phase and amplitude o...

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Problems solved by technology

[0003] However, since the chained SVG device integrates a large number of electronic chips and microprocessors, it is vulnerable to electromagnetic interference generated by high voltage and high current, and it may cause false alarms and shutdowns

Moreover, fluctuations, flicker and even short-term voltage loss caused by the joint action of power supply and load during the operation of the grid are unavoidable. Once the main controller of the existing chained SVG device detects the SVG device or the grid, such as the SVG device In abnormal conditions such as overcurrent, unbalance, grid overvoltage, undervoltage, frequency and unbalance exceeding the range, the main controller will send the main switch opening signal to drive the main switch to disconnect.

When the main switch is disconnected, the SVG device is disconnected from the power grid, and the SVG device must rely on human operation again, so there is still a lack of research on the technical solution for rapid and automatic restart of the SVG device after failure

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