Self-energized control method for novel high-voltage direct-current circuit breaker

Abstract

The invention discloses a self-energized control method for a novel high-voltage direct-current circuit breaker. The method comprises the following steps of firstly, employing a topological structure of the novel high-voltage direct-current circuit breaker, then, aiming at three modes of starting energy charging, steady-state operation and fault processing, analyzing the overall action characteristic and control strategy of the circuit breaker, and calculating the energy complementing period of the direct-current circuit breaker, and finally, establishing a typical example system for simulation research, and verifying the effectiveness and feasibility of the circuit breaker topology and the control strategy thereof. The load transfer switch and the main circuit breaker directly take energy through the sub-module capacitors, external power supply is not needed, the problems of insulation and voltage resistance which are difficult to solve in engineering are avoided, the design and manufacturing difficulty is reduced, and application of the circuit breaker topology in a high-voltage direct-current power grid is facilitated; through the control strategy designed by the invention, the capacitor voltage of the EHBSM can fluctuate within a manually set threshold value, so that the stability of energy is ensured, and the influence on the power supply reliability of the driving circuit caused by the violent fluctuation of the capacitor voltage is prevented.

Description

technical field [0001] The invention relates to a novel self-supply energy control method of a high-voltage direct current circuit breaker, which belongs to the technical field of circuit breaker control. Background technique [0002] Large-scale new energy grid connection through DC grid is the development trend of the future power system Compared with the traditional AC grid, the damping of the DC grid is relatively low, its faults develop faster, and it is more difficult to control and protect. [0003] At present, the research programs of high-voltage DC circuit breakers mainly focus on three types, namely, traditional mechanical circuit breakers based on conventional switches, solid-state circuit breakers based on pure power electronic devices, and hybrid circuit breakers based on the combination of the two. Among them, the hybrid high-voltage DC circuit breaker combines the advantages of the first two types of circuit breakers. It has both low on-state loss and fast br...

AI Technical Summary

Problems solved by technology

However, since the circuit breaker needs to be connected in series in the DC line, and the DC voltage level is relatively high, high requirements are placed on the insulation and withstand voltage of the external power supply circuit. This defect greatly limits the application of DC circuit breakers in the high-voltage technical field. application

Images