考虑线路电阻影响的MMC-MTDC自适应下垂控制  

An adaptive droop control method considering the influence of line resistance for MMC-MTDC

作　　者：王少林 王刚 陈琦 王晓磊 王海龙 杨金成 刘鸿鹏 WANG Shaolin;WANG Gang;CHEN Qi;WANG Xiaolei;WANG Hailong;YANG Jincheng;LIU Hongpeng(Department of Power Marketing,State Grid Xinjiang Electric Power Co.,Ltd.,Urumqi 830001,China;School of Electrical Engineering,Northeast Electric Power University,Jilin 132012,China;Digital Physical Hybrid Simulation Laboratory for Intelligent Energy and Energy Efficiency Services,Urumqi 830001,China)

机构地区：[1]国网新疆电力有限公司营销服务中心(资金集约中心、计量中心),新疆乌鲁木齐830001 [2]东北电力大学电气工程学院,吉林吉林132012 [3]智慧用能及能效服务数字物理混合仿真实验室,新疆乌鲁木齐830001

出　　处：《电力系统保护与控制》2022年第10期40-47,共8页Power System Protection and Control

基　　金：国家自然科学基金项目资助(52077030);国网新疆电力有限公司科技项目资助“面向用户侧多端智能用电场景下的多能互动研究”(5230YX20001B)。

摘　　要：下垂控制因其对通信的要求不高、可靠性高而在多端柔性直流输电中广泛应用。但是传统的下垂控制中下垂系数固定,尤其在系统功率波动较大时,容易导致换流站过载,并且直流线路上的电阻还会影响下垂控制换流站的有功功率分配。针对此类问题,提出了一种考虑线路电阻影响的自适应下垂控制。首先,分析在下垂控制下的多端柔性直流输电系统等效电路,推导出考虑线路电阻影响的下垂系数整定方法。然后在整定方法中用换流站的功率裕度比取代固定的功率分配比例系数,实现下垂系数的自适应调节。最后在PLECS上搭建仿真模型,对不同工况进行仿真,验证了所提控制策略的有效性。Because of low demand on communication and its high reliability,droop control is widely used in multi-terminal high voltage direct current systems.However,in traditional droop control,the droop coefficient is fixed.When the power fluctuates greatly,it is easy for this to lead to overload of the converter station,and the DC line resistance will affect the active power-sharing of the converter.To prevent this,an adaptive droop control method considering the influence of line resistance is proposed.First,the equivalent circuit of multi-terminal high voltage direct current under droop control is analyzed,and the droop coefficient setting method considering the influence of line resistance is deduced.Then the fixed power ratio is replaced by the power margin ratio of the converter station in the setting method to realize the adaptive adjustment of the droop coefficient.Finally,a simulation model is built on PLECS to simulate different working conditions,and the effectiveness of the proposed control strategy is verified.

关 键 词：多端柔性直流输电 线路电阻 有功功率分配 功率裕度 自适应下垂控制 

分 类 号：TM721.1[电气工程—电力系统及自动化]