解耦－补偿牛顿型三相潮流

DECOUPLING COMPENSATION NEWTON TYPE THREE PHASE LOAD FLOW

首次将三相潮流计算中三相约束条件转化为单相正序约束条件，不仅简化了分析，而且为直接采用单相潮流算法铺平了道路。将性能良好的牛顿－拉夫逊法、Ｐ－Ｑ分解法与电力网元件的三相解耦或三相解耦－补偿模型结合，形成了性能优良的解耦－补偿牛顿型三相潮流算法——即解耦－补偿牛顿－拉夫逊法和解耦－补偿Ｐ－Ｑ分解法。提出的三相潮流算法不仅适合于不对称三相电力系统正常运行方式的分析，而且也适合于不对称三相电力系统非正常运行方式，如稳态单相断线或开路的分析。算例表明，两种方法具有良好的收敛特性和快速的计算速度，且非常适于并行计算。

In this paper, with the incorporation of decoupling-compensation unbalanced network modelsand the transformation of three-phase bus specifications into positive single-phase bus specifications withany conventional single-phase load flow model , two novel decoupling-compensation Newton type three-phase load flow algorithms are proposed , which make use of special characteristics of power system net-works to achieve computational efficiency. These algorithms have sound convergence characteristics, needless storage requirements and take less CPU time. The algorithms presented in this paper are not only suit-able for normal unbalanced three-phase load flow analysis but also for abnormal unbalanced three-phaseload flow analysis. In addition to their speed on sequential computers, the algorithms are also suitable forparallel processing, witch is very promising for both on-line and off-line large scale unbalanced three-phase load flow analysis. It is worthwhile to mention that the algorithms proposed can also be extended tounbalanced three-phase harmonic load flow study.