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 zero potential characteristics of the operating point, a new method based on injection current for zero-potential uninterrupted operation in distribution network is proposed. The Floyd algorithm is used to calculate the shortest electrical distance from the live working point to the substation, and the capacitance value of the ground is measured by the resonant grounding system, and the current value injected further to the neutral point is calculated. By regulating the zero-sequence voltage, the neutral point voltage is equal to the difference between the operating phase line voltage drop and the operating phase power supply voltage, ensuring that the operating point voltage is zero. Finally, based on the PSCAD simulation software, the system model is established. The simulation verifies the feasibility of the proposed method by comparing the voltage curves of the working phase.
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 [11,12] 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 [13,14]
It can be seen from the figure that after the current injection, the C-phase voltage becomes 0, which verifies the feasibility of the zero-potential uninterrupted operation method of the proposed distribution network
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 on distribution network protection [5,6]. Based on the zero-potential theory and Journal of Electrical and Electronic Engineering 2019; 7(6): 163-169 technology of the operating point, this paper studies the zero-sequence current to control the phase voltage of the operating point to zero, and proposes a zero-potential non-blackout method. The feasibility of the proposed method is verified by simulation software PSCAD
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