考虑静态安全约束的含MMC-HVDC交直流混合系统最优潮流计算方法

A Novel Approach on Security-Constrained Optimal Power Flow for Hybrid AC/DC Grids Based on MMC-HVDC

提出了含模块化多电平换流器(modular multi-level converter,MMC)的柔性直流交直流混合系统最优潮流模型,考虑了换流器损耗及系统静态安全约束集,采用内点法求解电网中发电机组及柔性直流换流站的功率、电压最优控制值,从而达到整体电网优化的目的。另外,还结合实际物理电网的特点,提出了最优潮流计算过程中电网静态安全约束的实用化处理方法,并根据静态安全校核结果对优化模型约束条件进行修正。最后,通过测试算例及实际电网算例验证了上述方法的有效性。

This paper presents an optimal power flow（OPF） model for meshed AC/DC networks based on modular multi-level converter. OPF problem is formulated to minimize total network loss of whole AC/DC grids by adjusting generators and modular multi-level converters with N-1 constraints involved. A practical method is proposed to deal with N-1 static security-constraints with OPF. Case studies of IEEE testing cases and a practical network are carried out with results demonstrating effectiveness of the approach.