基于VSC的交直流混合中压配电网功率–电压协调控制  

Power-Voltage Coordinated Control in Hybrid AC/DC Medium Voltage Distribution Networks Based on VSC

作　　者：张璐[1] 唐巍[1] 梁军[2] 李根[2] 蔡永翔 

机构地区：[1]中国农业大学信息与电气工程学院,北京市海地区100083 [2]卡迪夫大学工程学院

出　　处：《中国电机工程学报》2016年第22期6067-6075,共9页Proceedings of the CSEE

基　　金：国家自然科学基金项目(51377162);国家电网公司科技项目(PD71-13-031)~~

摘　　要：针对城市配电网负荷密度高、电网增容空间有限及缺乏适应大规模可再生能源接入的灵活调节手段的现状,该文对交直流混合中压配电网结构及其功率控制策略进行研究。提出了将2条交流线路改造为交直流混合配电网的方案,给出了相应电压源换流器(voltage source converter,VSC)的结构及其调节方式,基于该方案提出了一种功率–电压协调控制方法用以消纳高渗透率分布式电源。根据节点电压将配电网运行分为正常和风险两种状态,在不同状态下建立了换流器功率控制的数学优化模型。在正常状态下以降低损耗为目标,在风险状态下以调压为目标,实现电网的经济安全运行。采用具有精英保留策略、自适应交叉率和变异率的改进遗传算法求解。通过算例仿真验证了所提方法的有效性,仿真结果表明:该方法能够充分利用换流器的功率调节能力提高分布式电源的消纳能力,抑制分布式电源的波动使节点电压保持平稳。同时,分析了正常状态与风险状态电压临界值对控制效果的影响。There are limited spaces for the fast increasing, highly concentrated loads in urban distribution networks. Voltage control is another challenge with integration of large number of distributed generation（DG） due to limited flexible control methods. This paper proposed to convert some AC lines to DC ones, and interconnected them with voltage source converter（VSC）, so that node voltages can be adjusted through power control of VSC, based on which DG can be further accommodated. Different structures of VSC and its ability of power control were analyzed. Two operation states were divided, which are normal state and risk state, based on node voltage in distribution networks. Two optimal models were developed for each state in order to optimize active and reactive power of VSC. Losses were minimized in the normal state, while voltage deviations were minimized in the risk state. The efficiency and flexibility of the proposed method are verified in case study. The penetration of DG was increased based on power control of VSC, which optimized voltage profile. Node voltages can also be kept stable when a sudden change of DG output happens. The influences of normal state range on optimal results were analyzed.

关 键 词：交直流混合配电网 分布式电源 直流配网 电压源换流器 功率–电压控制 

分 类 号：TM71[电气工程—电力系统及自动化]