Abstract
AC/DC hybrid power system has become an important distribution system for high-proportion distributed renewable energy consumption and multi-energy supply. Among the DC-side fault overvoltage, the inter-electrode fault overvoltage is the most harmful to the system. In order to analyze the principle of overvoltage generation, this paper establishes a mathematical model for AC/DC hybrid power system, and researches the mechanism of inter-electrode fault overvoltage generation on the DC side of the system, and builds a Matlab/Simulink simulation model so that gets the simulation analysis results of lOkV DC and ±375V DC side in the system. The research shows that the system high-frequency mathematical model relation which obtained according to the mathematical mode is belongs to the coupled nonlinear time-varying system. The DC-side overvoltage development can be divided into three stages: after happening of the fault until the converter station is locked, after the converter station is locked until the fault is removed, after removal of the fault until the converter station is unlocked. Through modeling and simulation, it is verified that the development process of overvoltage is consistent with the theoretical analysis. According to the research conclusion, the method of ‘arrester + parallel resistance + grounding device’ is proposed to protect the DC side overvoltage of the system.
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