Abstract
In the case of live working in the distribution network, a live method of live working that satisfies the requirements for personal safety and power supply reliability needs to be studied, because of the serious safety accidents caused by misuse and weak safety awareness. Based on the analysis of singlephase buck symmetrical operation characteristics, a new method of zero-potential live working of distribution network based on injection current is proposed. By injecting current into the neutral point, the zero-sequence voltage is regulated so that the neutral point voltage is equal to the value of the operating phase line voltage drop minus the operating phase power supply voltage, ensuring that the operating point voltage is zero. Based on the principle of current fast-break protection and time-limited overcurrent protection, it is analyzed that the zero-potential uninterruptible operation method of the distribution network will not affect the distribution network protection. Finally, the system model is established based on the MATLAB. The simulation verifies the feasibility of the method by the operating phase voltage curve and the correctness of the protection impact analysis by comparing the non-working phase current curve with the protection setting.
Highlights
With the rapid development of China's power grid and the continuous improvement of power supply reliability requirements[1], the research and standardization work of the live working technology has become a new development and breakthrough[2]
Reference [10] proved that the charging operation under bypass conditions is safe; Reference [11] introduced the method of implementing protective grounding for bypass flexible cable in integrated unpowered operation of 10kV distribution network; Three mobile power operation methods for mobile power generation vehicles, load transfer vehicles and EPS emergency power supply vehicles were introduced in [12]
A new method based on injection current for zero-potential live working of distribution network is proposed
Summary
With the rapid development of China's power grid and the continuous improvement of power supply reliability requirements[1], the research and standardization work of the live working technology has become a new development and breakthrough[2]. Live working as an important means to improve power supply reliability and service quality has received increasing attention. It was of great practical significance for the study of the methods and their impact on distribution network protection[5,6]. A new method based on injection current for zero-potential live working of distribution network is proposed. The zero-sequence current injection method was studied, and the zero-potential uninterrupted power removal method and implementation strategy were proposed, based on the zero-potential theory and technology of the operating point. The simulation software MATLAB is used to verify the feasibility of the proposed method and the correctness of the impact analysis
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