基于MMC的多端柔性直流输电系统控制策略研究
摘要：多端柔性直流输电系统比传统两端系统供电更加可靠,其控制系统相对也更加复杂。为弥补现有直流电压裕度控制及直流电压下垂控制的缺陷,设计了一种混合控制策略,该策略同时运用多端系统站间与站内混合控制方案进行配置,在站内电压裕度阶段引入倾斜特性,抑制了暂态过程中直流电压的过冲击;且避免了系统发生扰动时多个换流站功率同时变化。最后在PSCAD/EMTDC中构建了五端MMC-MTDC仿真模型,对3种控制方式下系统暂稳态特性进行仿真,仿真结果表明,所设计的混合控制系统具有良好的暂稳态特性,进一步增加了多端系统协调控制的灵活性和有效性。
Abstract:The multi-terminal flexible DC system is more reliable than traditional two-terminal system in power supplying, and the control system is more complicated relatively. To make up the defects of voltage margin control and voltage droop control, a hybrid control strategy is designed in this paper. The multi-terminal system converter station between stations and hybrid control scheme applied in station for configuration are used in this strategy, and the transient overvoltage of DC voltage is suppressed during transient process by introducing droop control at the phase of voltage margin in station, which avoids power synchronous changes in multiple-converter stations when disturbance occurs in system. In the end, a five-terminal MMC-MTDC simulation model is built in PSCAD/EMTDC, and the transient characteristics of three kinds of controls are simulated. The results show that the designed hybrid control system has good transient characteristics, and increases the multi-terminal system flexibility and effectiveness of coordinated control.
标题：基于MMC的多端柔性直流输电系统控制策略研究
英文标题：Research on Control Strategy of Multi-terminal HVDC Based on MMC
作者：宋平岗, 罗 剑, 游小辉, 吴继珍, 章 伟,
关键词：多端柔性直流输电, MMC, 直流电压控制, 电压混合控制, 电压裕度控制,
发表日期：2017-02-09
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