Multi-link SVG power module and bypass control method thereof

Abstract

The invention discloses a multi-link SVG power module, which comprises an SVG power module and a bypass switch. The SVG power module is formed by connecting a plurality of H-bridge inversion units in series, and the main contact of the bypass switch is connected with the output end of the SVG power module in parallel; only one H-bridge inversion unit in the SVG power module is connected with a closing coil of the bypass switch; when any H-bridge inversion unit of the multi-link SVG power module has a fault, a controller of the whole set of SVG device controls an H-bridge inversion unit connected with a closing coil of the bypass switch in the fault SVG power module to control the bypass switch to act, so that the whole multi-link SVG power module is bypassed; and according to the multi-link SVG power module, bypass control is carried out on the H-bridge inversion units through the bypass switch, a bypass control loop is greatly simplified, the cost is saved, operation of the SVG device can be rapidly recovered after bypass is carried out on the fault H-bridge inversion unit, and the loss is reduced.

Description

Technical field: [0001] The invention relates to the technical field of static var generators, in particular to a multi-chain SVG power module and a bypass control method thereof. Background technique: [0002] Static Var Generator (Static Var Generator SVG) is an inverter compensation device that uses fully-controlled power electronic devices as switching devices. There are positive implications for power system stability and power transfer capability. [0003] In the SVG system, the cascaded H-bridge structure is usually used. When a power unit module fails, in order to ensure that the fault does not expand further, wave sealing must be performed first. However, the faulty module is not disconnected from the main circuit at this time, and the It will charge the capacitor in the module, and eventually cause the capacitor to be damaged or even explode. Therefore, it is necessary to cut the faulty module from the main circuit through bypass measures to ensure the normal ope...

AI Technical Summary

Problems solved by technology

[0004] Bypassing the faulty module through the bypass switch is the most commonly used bypass method in engineering at present. Once the control system detects that the power unit is faulty, it will immediately issue an instruction to activate the bypass switch, remove the faulty module in time, and adjust the control system to send The modulation command ensures the system to resume work quickly; in the actual SVG equipment, each bypass switch needs to be controlled, the control loop is complicated, and it is easy to interfere with each other

Images