摘要
在受端交流侧发生故障时,现有依赖耗能装置的基于模块化多电平换流器的多端柔性直流(modular multilevel converter based multi-terminal direct current,MMC-MTDC)输电系统,其盈余功率处理方案存在经济性差和能量浪费等问题。为充分发挥MMC-MTDC系统自有盈余功率消纳能力,减少对耗能装置的依赖,文中提出一种基于主从能量控制的多站极间交互消纳策略。首先,建立相应的MMC-MTDC控制模型,并对其通过能量控制实现盈余功率消纳的可行性进行分析。随后,引入MMC三维度模型,实现换流站各极能量解耦控制,并通过构建的MMC-MTDC系统简化模型,对各类型换流站开展主动能量控制设计。在此基础上,类比主从控制思想,构建适用于不同受端站极交流故障及两类盈余功率情况的主从能量时序控制逻辑,以实现各站极之间的能量裕度协调利用。最后,在PSCAD/EMTDC平台搭建MMC-MTDC系统仿真模型进行实验验证。仿真结果表明,所提控制策略能够在不依赖耗能装置的前提下,有效协调多站极之间的能量控制,适应多种盈余功率故障情况,成功实现故障穿越。
Modular multilevel converter based multi-terminal direct current(MMC-MTDC)systems rely on energy-dissipating devices to handle surplus power caused by AC-side faults at the receiving-end,which suffers from poor economic efficiency and significant energy waste.To fully exploit the inherent surplus power absorption capability of MMC-MTDC systems and reduce dependence on energy-dissipating devices.A master-slave energy coordination strategy is proposed for interactive power absorption among multiple converter stations.Firstly,an MMC-MTDC control model is established,and the feasibility of surplus power absorption through energy-based control is analyzed.Subsequently,a three-dimensional energy model of the MMC is introduced to achieve decoupled energy control for each pole of the converter stations.Based on a simplified MMCMTDC system model,active energy control schemes are designed for different types of converter stations.Furthermore,inspired by the master-slave control concept,a timing-based energy coordination logic is developed to address various AC-side fault scenarios at different receiving-end stations and two categories of surplus power levels,thereby enabling coordinated utilization of available energy margins across multiple converter stations.Finally,a MMC-MTDC system is implemented in PSCAD/EMTDC for simulation validation.Results demonstrate that the proposed strategy effectively coordinates multiple converter stations energy control without requiring energy-dissipating devices.The strategy can adapt to diverse surplus power conditions and successfully achieve fault ride-through.
作者
王骆
王宁
张倩茅
秦梁栋
张建坡
吴云锐
WANG Luo;WANG Ning;ZHANG Qianmao;QIN Liangdong;ZHANG Jianpo;WU Yunrui(Economic Research Institute of State Grid Hebei Electric Power Co.,Ltd.,Shijiazhuang 050022,China;Department of Electrical Engineering,North China Electric Power University,Baoding 071003,China)
出处
《电力工程技术》
北大核心
2026年第1期93-105,共13页
Electric Power Engineering Technology
基金
国网河北省电力有限公司科技项目“考虑受端电网承载力的直流输电容量规划技术研究”(SGTYHT/23-JS-001)资助
