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Distributed Reactive Power Optimization Computing in Multi-area Power Systems Using Ward Equivalent

机译：使用沃德当量的多区域电力系统中的分布式无功优化计算

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This paper presents a new decomposition and coordination algorithm based on Ward equivalent to solve distributed reactive-power optimization problem in multi-area power system. At first, multi-area interconnected power system is partitioned into master and slaver areas, boundary buses are defined as different bus types respectively corresponding to different areas, and hence the transfer method of phase angles from master area to slaver areas is determined. Secondly the initial value of equivalent injection power is obtained according to power-flow calculation at basic operating state. Then computational efficiency of the equivalent admittance matrix of external network due to change of transformer ratios is highly enhanced during optimization process by means of the inverse matrix modification lemma, and also the equivalent accuracy of external network is improved greatly. Moreover a kind of external coordination strategy which is suitable for reactive-power optimization calculation is introduced and better coordination effects with less coordination communications are obtained. Finally testing results on 538-bus practical systems is used to validate the correctness and effectiveness of the proposed algorithm in comparison with the centralized optimization method.
机译：本文介绍了基于沃德相当于解决多区电力系统分布式无功功率优化问题的新分解与协调算法。首先，多区域互连电力系统被划分为主和奴隶区域，边界总线被定义为分别对应于不同区域的不同总线类型，因此确定了从主区域到奴隶区域的相位角的转移方法。其次，根据基本操作状态的电流计算获得等效喷射功率的初始值。然后，由于变压器比的变化，在通过逆矩阵修改引理期间，由于变压器比的变化而导致的等效导通矩阵的计算效率高度增强，并且还大大提高了外部网络的等效精度。此外，介绍了一种适用于无功功率优化计算的外部协调策略，并获得了更好的协调通信的协调效果。最后测试结果538总线实际系统用于验证所提出的算法的正确性和有效性与集中式优化方法相比。

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