Optimal Power Flow for Hybrid AC/DC Grid With Power Electronic Transformer

被引：0
|
作者：
Geng Q. [1 ]
Hu Y. [1 ]
He J. [2 ]
Zhou Y. [3 ]
Zhao W. [3 ]
机构：
[1] Institute of Electronic Information and Electrical Engineering, Shanghai Jiao Tong University, Minhang District, Shanghai
[2] Dongguan Power Supply Bureau, Guangdong Power Grid Limited Liability Company, Dongguan, 523000, Guangdong Province
[3] Electric Power Research Institute of Guangdong Power Grid Co., Ltd., Guangzhou, 510080, Guangdong Province
来源：
Dianwang Jishu/Power System Technology | 2019年 / 43卷 / 09期
关键词：
Hybrid AC/DC grids; OPF; Power electronic transformer; Semi-definite programming;
D O I：
10.13335/j.1000-3673.pst.2018.2944
中图分类号：
学科分类号：
摘要：
Development of power electronic technology and application of DC power and DC load promote transformation of AC power grid to hybrid AC/DC power grid. The optimal power flow (OPF) of traditional AC grid can determine the safe and economic operation state of the grid. Existence of nonlinear power flow equation makes the OPF problem belong to nonlinear and non-convex optimization category. In the hybrid AC/DC grids with power electronic transformers (PETs), the operational constraints of PETs further increase non-convexity. This paper focuses on addressing non-convexity of the OPF problem in hybrid grids. The objective function of the OPF problem in hybrid grids is to minimize generation cost and the loss of lines and power electronic transformers. The constraints include power balance constraints of each node in the hybrid grids, voltage amplitude constraints, power constraints of each branch, and operational constraints of power electronics transformers. In this paper, convex relaxation technique is used to transform the OPF problem into a semi-definite programming (SDP) problem, and the sufficient conditions for zero relaxation gap are derived to obtain global optimal solution. The simulation on extended IEEE 33 test system with PETs proves that the sufficient condition of zero relaxation gap is applicable to actual hybrid AC/DC power grid, and the global optimal solution can be obtained. © 2019, Power System Technology Press. All right reserved.
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页码：3288 / 3296
页数：8
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