Mechanical self-oscillation DC circuit breaker and parameter determination method and device

Abstract

The invention provides a mechanical self-oscillation DC circuit breaker and a parameter determination method and device. The mechanical self-oscillation DC circuit breaker comprises a control module;a mechanical switch branch, an oscillation branch and an absorption branch, which are connected in parallel. The circuit breaker employs fewer devices, so the size is small, and the manufacturing costis low. Parameters determined by the method comprise the action time of the control module, the response action time of a mechanical switch in the mechanical switch branch, and the value ranges of anoscillation capacitor C and an oscillation inductor L in the oscillation branch, thereby providing a reliable way for the selection of parameters of a mechanical DC circuit breaker. Meanwhile, the influence of different RLC parameters of the oscillation branch on the on-off process of the circuit breaker is compared and analyzed based on the on-off characteristics of the mechanical self-oscillation DC circuit breaker, and therefore, the parameters of the oscillation branch are optimized; the influence rule of different on-off time sequences of the mechanical self-oscillation DC circuit breaker on DC on-off is analyzed, so that the optimal matching time sequence of the mechanical switch branch and the oscillation branch during fault current on-off is determined.

Description

technical field [0001] The invention relates to a mechanical direct current circuit breaker, in particular to a mechanical self-excited oscillation direct current circuit breaker, a parameter determination method and a device. Background technique [0002] The DC circuit breaker is an important equipment for the flexible conversion of the operation mode and the breaking of the fault current in the DC transmission system. At present, the processing method for the short-circuit fault in the DC transmission system is as follows: firstly, the converter station is blocked, and then the AC circuit breaker is switched off by the operating mechanism, thereby isolating the short-circuit fault. This treatment method will cause a short-term outage of the AC system, which is not conducive to the reliability of the power supply of the grid. Therefore, the DC circuit breaker is the bottleneck that limits the scale and capacity expansion of the DC transmission system. Therefore, the desig...

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Problems solved by technology

[0008] In order to overcome the disadvantages of mechanical switch contacts in the prior art that are easily damaged, large in size, high in cost, and unfavorable for parameter selection of mechanical DC circuit breakers, the present invention provides a mechanical self-excited oscillation DC circuit breaker, parameter determination The method and device, the mechanical self-excited oscillation type DC circuit breaker includes a mechanical switch branch, an oscillation branch, an absorption branch and a control module, adopts fewer devices, is small in size and low in cost, and obtains a mechanical self-excited oscillation type DC circuit breaker. The parameters of the circuit breaker include the action time of the control module, the response time of the mechanical switch in the mechanical switch branch, the value range of the oscillation capacitor C and the oscillation inductance L in the oscillation branch, which provide reliable parameters for the selection of mechanical DC circuit breaker parameters. way

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