电磁环网中无功环流的分析与控制

电磁环网是在电网发展过程中产生和消亡的一种特殊的网架结构。多年来，对电磁环网的研究多以安全控制为目标，分析其是否开环运行，而对电磁环网合环运行的功率控制研究较少，对其无功功率控制的研究更为少见。文章针对电磁环网中出现的无功环流问题，分析了其产生机理和控制措施，并将研究成果用于指导西北电网刘家峡—炳灵330/ 220 kV电磁环网无功环流的控制中。研究表明，对电磁环网中的无功环流进行控制可显著降低网损，提高电网经济效益。该研究有望对我国750 kV和特高压电网发展过程中形成的电磁环网的安全、经济运行起到一定的指导作用。

Analysis and Control of Reactive Circular Power Flow in Looped Electromagnetically Coupled Power Networks

The looped electromagnetically coupled power network that appears and dies out during the development of power grids is a particular form of network configuration. Throughout the years, the security and control of looped electromagnetically coupled power network are taken as main research objectives and whether it is operated in open-looped mode is analyzed, whereas the power flow control under the looped operation of looped electromagnetically coupled power network is seldom researched, especially the control of reactive power. For the reactive circular power flow in looped operation of looped electromagnetically coupled power network, its procreant mechanism and control strategy are analyzed and the research results are applied in the control of reactive circular power flow in looped electromagnetically coupled 330 kV and 220 kV power network from Liujiaxia to Bingling in Northwest China power grid. Research results show that the control of reactive circular power flow in looped electromagnetically coupled network can evidently decrease the network loss and improve economic effect of power grid. It’s hopeful that the research is useful to the security and economy of the coming looped electromagnetically coupled power networks of 750 kV and EHV power grid in China.