Journal of Shandong University(Engineering Science) ›› 2021, Vol. 51 ›› Issue (5): 107-113.doi: 10.6040/j.issn.1672-3961.0.2020.110

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Intelligent commutation system of distribution network based on differential evolution algorithm

Yunlong ZHAO(),Renfei CHE*(),Jiahui CHEN   

  1. School of Electrical Engineering, Shandong University, Jinan 250061, Shandong, China
  • Received:2020-04-15 Online:2021-10-20 Published:2021-09-29
  • Contact: Renfei CHE E-mail:zyl2019@mail.sdu.edu.cn;cherenfei@sdu.edu.cn

Abstract:

The application of three-phase intelligent commutation switch was an effective measure to solve the problem of three-phase load imbalance in low-voltage distribution network. Based on the commutation process of the three-phase intelligent commutation switch, an intelligent commutation system of the distribution network was proposed, which took the differential evolution algorithm as the core and the mixed solid-state switch as the foundation. Aiming at the unbalance degree of three-phase current and the action times of commutation switch, differential evolution algorithm was used to optimize the commutation strategy. The optimal commutation strategy was obtained through initialization, mutation, crossover and selection operation, which improved the real-time and accuracy of the system. In this paper, through the combination of magnetic holding relay and IGBT based solid-state switch, a fast switching method using hybrid solid-state switch was proposed, which the commutation switch showed the characteristics of low power consumption and strong current passing ability, and improved the reliability of the system. The feasibility of the algorithm and switch in fast switching and im-proving the power quality of the commutation process was verified by practical test.

Key words: three-phase imbalance, three-phase intelligent commutation switch, differential evolution algorithm, greedy algorithm, commutation strategy

CLC Number: 

  • TM7

Fig.1

Hardware circuit diagram of commutation actuator"

Fig.2

Schematic diagram of commutation process from phase A to phase B"

Fig.3

Control circuit diagram of phase commutation actuator (phase A)"

Table 1

Current data detected by commutation switch in station area"

换相开关编号 所测有效电流/A 换相前所在相别 换相后所在相别
1 20.79 A相 B相
2 34.44 A相 C相
3 29.56 B相 B相
4 33.28 A相 A相
5 20.25 C相 A相
6 11.23 C相 C相
7 18.55 A相 A相
8 6.45 C相 C相
9 25.78 B相 C相
10 11.54 B相 B相
11 20.45 C相 C相
12 10.57 A相 A相
13 20.55 B相 A相
14 13.46 C相 B相
15 5.67 C相 C相
16 28.89 B相 B相

Fig.4

Comparison of the generation process of initial value"

Fig.5

Optimization of objective function value ε"

Fig.6

Optimization of objective function value H"

Fig.7

Current waveform of hardware commutation"

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