潮流追踪算法比较研究

Research on comparison of power flow tracing methods

对已提出的潮流追踪算法进行了比较研究 ,明确了在采用有功 /无功解耦追踪的方式下 ,由于有功或无功有向图不能同时提供用于损耗分摊的有功和无功功率分布信息 ,所以无法进行准确的潮流追踪 ;提出了功率损耗向量图的作法 ,并以此为工具揭示了利用追踪电流来进行潮流追踪的方法存在的问题 ,仿真算例验证了所提出的观点 ;通过分析 ,明确了在有功功率通路与无功功率通路不同的运行方式下 ,即使采用考虑有功、无功相互影响的损耗分摊原则 ,也无法准确地直接确定功率归属 ,而迭代追踪的方式是解决该问题的一个有效途径 .

The power flow tracing methods existing are compared. It is clarified that the power flow can't be traced exactly since the information of active and reactive flow used to allocate power losses can't be offered in directed active or reactive power flow graph simultaneously. The power loss vector diagram is proposed and used as a tool to investigate the real and imaginary currents tracing method. Results show that in some cases the loss allocating results by current tracing method are not reasonable. Simulations verify this phenomenon. It is also clarified that even if the loss allocating rule which considers the interaction between active and reactive power is used, the power flow can't be exactly traced directly when active power flow path is different from that of reactive power flow. The proposed iterative method can solve the problem.