摘要
直流潮流控制器作为柔性直流输电系统的关键设备之一,实现其多端口输出能有效提高装置的潮流控制范围与能力。针对现有直流潮流控制器应用的局限性,该文基于电容线间能量交换的思想提出一种新型多端口直流潮流控制器。其拓扑结构简单,且避免了传统多端口直流潮流控制器对输电系统定直流电压站直流输出电压调节的依赖,增强了系统可靠性。同时,其采用模块化设计,易于实现后期的端口拓展与系统冗余。首先通过对现有方案的对比分析提出控制器拓扑结构并阐述其工作原理;然后,基于脉宽调制设计包含不同控制模式的通用控制策略,并详细分析不同控制模式下系统各状态变量之间的关系;最后,在基于RT-lab的实时模型在环仿真测试系统中搭建五端柔性直流输电系统模型,对所提控制器的性能与控制策略进行多种工况下的验证。
DC power flow controller(DCPFC) is one of the key equipment of flexible DC transmission system.Realizing DCPFC multi-port output can effectively improve the power flow control range and capability of DCPFC. For the application limitations of the existing DCPFCs, a new multi-port DCPFC based on capacitance energy exchange between lines was proposed. Its topology is simple, and avoids the dependence on the voltage regulation at the DC outside of the main converter station in the transmission system, which enhances the reliability of the system. Besides, it uses the standard modular design, which is easy to achieve the port expansion and system redundancy. Firstly, the topology and working principles of the controller were analyzed by comparing the existing solutions. Then, a general control strategy including different control modes was designed based on pulse width modulation, and the relationships between system state variables under different control modes were analyzed in detail. Finally, the performance of the proposed DCPFC and control strategy were verified in a real time model in loop(MIL) simulation test system based on RT-lab.
引文
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