考虑降低暂态电压失稳风险的动态无功优化配置方法

A dynamic VAR optimal configuration method for reducing the risk of transient voltage instability

为了降低系统动态负荷尤其是电动机负荷比重越来越大带来的电网暂态电压失稳风险,提出了一种考虑降低暂态电压失稳风险的动态无功优化配置方法。综合考虑动态无功补偿装置的安装地点和容量,使得系统暂态电压失稳的风险最小和动态无功补偿的成本最小。该方法首先通过暂态电压失稳风险指标和灵敏度指标确定关键故障集合、动态无功补偿的候选节点,然后将各个动态无功补偿装置的容量作为变量引入烟花优化算法中求解。为了减少优化过程的时间,在优化算法中增加了一个火花筛选的环节。IEEE39节点算例仿真结果表明,该方法与仅考虑动态无功补偿装置地点的优化方法相比,在相同的无功补偿成本下能更好地降低暂态电压失稳风险。

To reduce the risk of transient voltage instability caused by the dynamic load of the system, especially the increase of the proportion of the motor load, a dynamic reactive power optimal configuration method is proposed. In order to obtain the smallest risk of transient voltage instability and the smallest dynamic reactive compensation cost, the algorithm takes the dynamic reactive compensation device capacity and installation position into overall plan mad consideration. The critical fault set and the candidate buses of dynamic reactive power compensation are determined by the transient voltage instability risk index and sensitivity index. The capacity of each dynamic reactive power compensation device as variables into the fireworks optimization algorithm to solve. A spark screening link is added in the optimization algorithm for reducing the optimization process time. The simulation results of IEEE39-bus system show that the proposed method can better reduce the transient voltage instability risk under the same reactive power compensation cost compared with the optimization method only considering the dynamic reactive power compensation device installation position. This work is supported by National Natural Science Foundation of China （No. 51507116）.