区间不确定集鲁棒优化的含风电系统无功电压控制

针对风力发电需要吸收电网大量无功而影响系统无功分布和电压水平的问题,研究在满足系统运行约束的条件下,考虑接入风电场节点无功功率与风电场出口无功、风电场补偿容量关系,以网损最小、提高系统节点电压水平为目标函数。首次引入鲁棒优化方法,视风速为随机变量,以区间不确定集表示风速的不确定性,运用对偶定理将模型转化为确定性的线性规划问题并进行求解,建立了含风电场的电力系统电压无功控制模型,并求得全局最优解。以风电场接入IEEE30节点系统进行仿真计算,并对风速波动下的情况进行比较分析,随机的风速被有效量化,网损减少,电压水平提高,验证了该方法的有效性及其工程实用性。

Reactive Voltage Control Containing Wind-Power System of the Interval Uncertainty Set Robsut Optimization

The character of reactive power in wind power integrated system affects active power losses and voltage level of the whole system. Considering the relationship among reactive power absorbed by wind farm, wind reactive power output and reactive compensation capacity, minimizing power losses and improving voltage level taken as the objective. As a random variable, the uncertainty of the wind speed is demonstrated in an interval uncertainty set for transforming the uncertain constraints into the certain form. The duality theorem is utilized to simplify the model to be general linear programming ones. The reactive power/ voltage control model included Robust Optimization （RO） is proposed firstly. IEEE30 - node system is utilized to test the model and method. The results show that the random wind speed is quantitated effectively, power losses are reduced, and even the voltage of entire system can be restricted within regular range. The reactive power optimization method with RO is simple, feasible and significant.