Bypass isolation device for cascade type converter system, cascade type converter system and control method

Abstract

The invention discloses a bypass isolation device for a cascade type converter system, a cascade type converter system and control method. The bypass isolation device comprises a first input end, a second input end, a first output end, a second output end and a control end. The conductive connection between the first input end and the second input end is in off state, the first input end and the first output end, the second input end and the second output end are respectively in conductive connection state, and the control end receives control signals. According to control information receivedby the control end, a conductive connection is formed between the first input end and the second input end, after the conductive connection is formed, the conductive connection between the first input end and the first output end and / or between the second input end and the second output end is disconnected, and after the conductive connection is disconnected, the output lines of the first outputand the second output are completely disconnected and form a visible breakpoint. The bypass isolation device for cascade type converter system, cascade type converter system and control method can perform on-line maintenance of a converter module by means of the bypass isolation device.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a bypass isolation device for a cascaded converter system, a cascaded converter system and a control method. Background technique [0002] The converter modules in the cascaded converter system are often equipped with a bypass module. When the converter module fails, the system will control the bypass module to bypass the associated converter module to realize the bypass function of the converter module. In the absence of one-stage or multi-stage converter modules, the system can still operate reliably within a certain range by properly adjusting the control strategy, and the converter modules can be replaced and repaired after shutting down at an appropriate time. [0003] However, in the absence of one-stage or multi-stage converter modules, the cascaded converter system needs to derate or overload the converter modules, which will easily lead to failure of new conver...

AI Technical Summary

Problems solved by technology

[0004] The present invention provides a bypass isolation device for a cascaded converter system, a cascaded converter system and a control method to solve the problem that the converter module can only be operated when the cascaded system is shut down in the existing solution. The problem of lost downtime due to maintenance

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