基于诺顿等值的多区域系统无功优化分解协调算法

A Norton Equivalence Based Decomposition and Coordination Algorithm of Reactive Power Optimization for Multi-Regional Power Grid

采用节点分裂法将电力系统按照实际地理位置进行区域分解。通过对外部系统进行诺顿等值,实现各个区域无功优化的独立计算,即内层迭代计算。引入了一套简单有效的协调机制修正边界节点的等值注入功率和电压,即外层迭代计算,最终实现大系统无功优化分解与协调计算,提高了计算效率。文中所提算法增加了各区域间优化计算的独立性,降低了区域间数据交换量,便于实施分布式计算。以236节点系统和某2212节点实际系统为例,通过与集中优化算法的比较验证了所提算法的有效性。

The region decomposition of power system according to its actual geographical position is performed by bus-tearing method. By mean of Norton equivalence of external power systems, the independent calculation of reactive power optimization for each region, namely the internal iteration, is implemented. For this purpose, a set of simple and valid coordination mechanism, i.e., the external iteration, is led in to modify the equivalent power and voltage injected into boundary bus, thus the decomposition and coordination calculation of reactive power optimization in large-scale power grid can be realized and the calculation efficiency is improved. The proposed algorithm can enhance the independency of optimization calculation among regions and reduce the data exchange among regions, so that the distributed computation is convenient to execute. Taking a 236-bus system and certain 2212-bus system for calculation examples and comparing the obtained results with that by concentrated optimization algorithm, the effectiveness of the proposed algorithm is validated.