• CSCD核心库收录期刊
  • 中文核心期刊
  • 中国科技核心期刊

ELECTRIC POWER CONSTRUCTION ›› 2022, Vol. 43 ›› Issue (10): 147-157.doi: 10.12204/j.issn.1000-7229.2022.10.014

• New Energy Power Generation • Previous Articles     Next Articles

Optimal Scheduling Method for Distributed Photovoltaic Generation in Distribution Network Considering Power Quality Improvement

ZHANG Min, ZHI Huiqiang, ZHANG Shifeng, FAN Rui(), LI Ran, WANG Jinhao   

  1. Electric Power Research Institute of State Grid Shanxi Electric Power Company, Taiyuan 030001, China
  • Received:2022-03-31 Online:2022-10-01 Published:2022-09-29
  • Contact: FAN Rui E-mail:fanrui1321607@163.com


Aiming at the problems of voltage violation, harmonic distortion and three-phase imbalance in distribution network, this paper studies the optimal scheduling model and its solution algorithm of distributed photovoltaic generation in distribution network from the perspective of comprehensively improving power quality. Firstly, the control scheme of reactive power, harmonic current and unbalanced power compensation of the grid-connected inverter of distributed photovoltaic generation is analyzed. On this basis, taking the three-phase power and harmonic current output of schedulable distributed photovoltaic generation as control variables, combined with the three-phase fundamental and harmonic power flow equations of distribution network, an optimal power flow model considering the improvement of power quality is established. Then, a two-stage optimization algorithm with alternating iteration of power flow calculation and optimization calculation is proposed to reduce the variables of the nonconvex nonlinear optimal power flow model and convert it into a convex quadratic constrained quadratic programming model, so as to achieve efficient solution. Finally, a case study is carried out on a 162-node three-phase distribution network. The results show that, after the scheduling of distributed photovoltaic generation according to the solution of optimal power flow model, the problems of harmonic distortion, three-phase imbalance and voltage violation of distribution network have been effectively improved, and the computational efficiency of the two-stage optimization algorithm also meets the distribution network scheduling requirements, which verifies the effectiveness of the proposed optimal scheduling method for distributed photovoltaic generation in improving the power quality of distribution network.

Key words: distribution network, power quality, distributed photovoltaic generation, optimal scheduling

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