基于EMS的分布式地县电网AVC控制策略

针对地、县电网垂直耦合紧密，县网规模较小，提出一种新型分布式地县电网AVC控制策略。该策略基于EMS地县一体化自动化系统，首先在地调、县调自动化系统中分别部署AVC应用，地调和县调的AVC可运行在联调、解列两种模式下。其次建立分布式AVC系统优化控制模型，并对优化目标函数引入计算因子，使得该模型同时适用于地调AVC和县调AVC，简化了计算算法。最后现场运行效果表明，该策略可实现从整个地区电网的角度进行区域电网无功优化，进一步提高地调、县调电压合格率。

Research on control strategy of distributed AVC for district grids based on EMS

In view of power supply connection between the regional grids and smaller county grids, a novel distributed AVC system for district power networks is proposed. Firstly, a two-level AVC system is set up in the region and county power dispatch centers separately based on the integrated EMS both for regional wide and county wide grids. In this way, the two-level AVC system can run in the global mode or in the independent mode. Then the distributed AVC optimal control model is established, and the calculation factor is introduced in the objective function of the system, with which the calculation algorithm can be simplified. The optimal control model would be applied to the region and county AVC system at the same time. At last, the application in Wuhu grid shows that the system optimizes reactive power flow from the perspective of the whole region and improves the voltage qualification of the regional and county grids.