利用电流的实部与虚部分量进行复功率追踪

输电设备利用份额问题不仅与系统的有功功率有关，而且与系统的无功功率有关。提出了一种基于电流的实部与虚部分量进行复功率全面追踪的方法。在潮流求解的基础上，将系统中所有的发电机注入功率、负荷功率和接地支路的注入功率均转换成电流的实部与虚部分量，然后根据电流在支路中不变的特点分别对电流的实部与虚部进行追踪，求出各源点电流在支路电流中所占的份额，最后再合成为相应的复功率分量，并通过向支路复功率方向投影的方式确定出各源点复功率的利用份额，这样克服了电网中由于有功及无功功率的耦合而难以分别对其进行追踪的问题，其特点是计算结果与平衡点的选择无关且计算过程简单。算例表明该方法可以简洁有效地给出电源点或负荷点的复功率在各支路复功率中所占的份额，并与单纯的有功功率追踪结果进行了对比。

COMPLEX POWER FLOW TRACING VIA REAL AND IMAGINARY CURRENT COMPONENTS

In a competitive environment, the transmission equipment usage and loss allocation problems must be answered clearly. These problems are concerned with not only active power but also reactive power. In this paper, a new power flow tracing method based on real and imaginary current components is proposed. Starting with a power flow solution, all power injections including ground branches are translated into real and imaginary currents to avoid the problems arising from the nonlinear coupling between active and reactive powers caused by losses. Then the currents are traced separately according to the property of current keeping unchanged in a branch. Finally, the current contributions can be translated into contributions of complex power of every source to every branch through projecting the complex power components along the direction of the total complex power of that branch. The merit of the proposed method is that the calculation results are independent with the choice of relax bus. The case study is performed on IEEE 24-bus RTS, the comparison between pure active power tracing and complex power tracing is given to illustrate the necessary of complex power tracing.