耿琪;胡炎;何建宗;周永言;赵伟;

• 1:上海交通大学电子信息与电气工程学院
• 2:广东电网有限责任公司东莞供电局
• 3:广东电网有限责任公司电力科学研究院

摘要(Abstract)：

电力电子技术的发展以及直流电源和直流负荷的应用,促使交流电网向交直流混合电网转变。传统交流电网最优潮流(OPF)问题可以确定电网的安全经济运行状态,非线性潮流方程的存在使得OPF问题属于非线性非凸优化问题的范畴。在融合电力电子变压器(PET)的交直流混合电网中,PET的运行约束进一步增加了交直流混合电网OPF问题的非凸性。将重点解决交直流混合电网OPF问题的非凸性。交直流混合电网OPF问题的目标函数为最小化发电成本以及线路和电力电子变压器的损耗,约束条件包括交直流电网中各节点功率平衡约束,电压幅值约束,各支路功率约束以及和电力电子变压器相关的运行约束。使用凸松弛技术将OPF问题转化为半定规划(SDP)问题,并推导得出零松弛间隙的充分条件,以获得全局最优解。在含PET的扩展IEEE 33测试系统上进行仿真,证明了零松弛间隙的充分条件适用于实际交直流混合电网,并且可以获得全局最优解。

关键词(KeyWords)： 交直流混合电网;电力电子变压器;最优潮流;半定规划

Abstract:

Keywords:

基金项目(Foundation): 国家重点研发计划资助项目(2017YFB0903202)~~

作者(Author): 耿琪;胡炎;何建宗;周永言;赵伟;

Email:

DOI: 10.13335/j.1000-3673.pst.2018.2944

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