VSC-HVDC线路接入点选址及容量优化配置方法

Method of access point selection and capacity optimal configuration for VSC-HVDC line

提出了一种新的交直流混合网络中柔性直流输电系统(VSC-HVDC)线路接入点选择和容量配置方法。在综合考虑多个典型过载工况的基础上,设计了一种综合灵敏度因子,用于评估所有可能的VSC-HVDC线路接入点,从而筛选出合适的接入点构成候选方案集。针对各候选方案在不同工况下分别建立相应的多目标优化模型,该模型以直流注入功率为决策变量,兼顾线路过载指标和容量成本。此外,还定义和引入了相关评估指标以衡量不同候选方案下所得的结果,从而确定了最优方案。通过对新英格兰标准系统进行仿真,仿真结果表明所提方法能够改善电网N-1故障下的过载问题并尽可能降低直流容量成本。

A new method of access point selection and capacity optimal configuration for VSC-HVDC line is proposed.With the consideration of multiple typical overload operation conditions,a comprehensive sensitivity factor is designed to evaluate all possible access points for VSC-HVDC line,so as to select the appropriate access points to form a set of candidate schemes.Taking the DC injected power as the decision variable and considering the line overload index and the capacity cost,the corresponding multi-objective optimization model is established for each candidate scheme under different operation conditions.In addition,related evaluation indexes are defined and introduced to measure the results under different candidate schemes,so as to determine the optimal scheme.Through the simulation of New England standard system,the simulative results show that the proposed method can effectively mitigate the overload problem under the N-1 contingency and reduce the DC capacity cost as much as possible.