互联电力系统可靠性的改进优先分解模拟算法

An Improved Preferential Decomposition-simulation Algorithm for Interconnected Power Systems Reliability Evaluation

针对大型互联电力系统可靠性评估,提出一种改进的优先分解模拟算法,该算法由分解和模拟过程组成。针对现有文献在分解阶段的不足,该算法定义了最小不停电容量并提出了最小不停电容量的更精确的求解方法;将电力不足区域分为受援充足区域和受援不足区域2种类型,修改了受援不足区域的受援方式;提出了一个可提高区域电力不足期望值的求解速度的优化措施。应用该算法对4、6、8区域互联系统进行计算,将其计算结果与同时分解模拟法和优先分解模拟法进行比较,证明该算法可以提高计算的速度和精度。

Aimed at interconnected power systems reliability evaluation, an improved preferential decomposition -simulation algorithm which consisted of decomposition phase and simulation phase was proposed. In order to make up the disadvantage in decomposition phase depicted in the existing literatures, this paper defined the concept of minimal no loss capacity （MNLC） and proposed a new method to calculate it. In this paper, the power deficiency region was classified into adequately assisted region （AAR） and inadequately assisted region （IAR）, and the manner of receiving assistance of IAR was modified. The paper also introduced an optimization measure which reduced the time of calculating area loss of load expectation （LOLE）. The proposed algorithm was tested in four, six and eight areas interconnected system, the calculation results were compared with simultaneous decomposition- simulation method and preferential decomposition-simulation method. Comparison results show that the new algorithm improves the accuracy and speed.