基于降阶雅可比矩阵的并网风电场局部静态电压支撑能力评估

提出一种基于降阶雅可比矩阵的并网风电场无功/电压支撑能力评估方法。该方法选择研究区域内的部分节点为注入节点,通过雅可比矩阵降阶的方法消去系统中的其他节点,得到仅包含研究区域节点的部分节点降阶雅可比矩阵,进而求得接入点电压关于本地无功功率和风电场无功功率变化的灵敏度,并得出风电场对接入局部区域的电压支撑能力指标。同时,通过相关灵敏度的比较还可以选择风电场接入电网的无功补偿点和确定无功补偿容量。实际系统算例结果表明该方法是准确可行的,并具有良好的适应性。

Reduced Jacobian Matrix Based Method to Assess Local Static Reactive Power/Voltage Supporting Ability of Interconnected Wind Farm

Based on the reduced Jacobian matrix, a method to assess the reactive power/voltage supporting ability of interconnected wind farm is proposed. In this method, partial nodes in the studied region are chosen as "injection node" and by means of reduction of Jacobian matrix all of other nodes of the system are eliminated, thus a partial nodes reduced Jacobian matrix is obtained, and then the sensitivity of interconnecting point of wind farm to the variation of both local reactive power and wind farm reactive power can be solved, thus the voltage supporting ability index of wind farm to the partial region where it is interconnected is acquired. Meanwhile, by means of comparing relevant sensitivities, the position to install reactive power compensator for the interconnection of wind farm with power grid can be chosen and the reactive power compensation capacity can also be determined. Calculation results of practical power grid show that the proposed method is feasible and possesses good adaptability.