基于电压自动控制的智能电网自愈策略

Self-Healing Strategy of Smart Grid Based on Voltage Automatic Control

自愈能力是智能电网的重要特征和标志,而电压与无功控制是智能电网主要自愈功能之一。当电网运行工况发生变化时,需要与当前运行方式相匹配的新的电压控制策略来实现电网电压的安全自愈。在已有的无功优化算法基础上,根据电压灵敏度得到各节点电压变化量,以各节点电压与电压期望值方差的最小值为目标函数,采用动态规划法求解控制设备的动作顺序,从而得到电压自动控制策略。IEEE-30节点系统算例分析结果表明,所提方法正确有效,不仅能够实现电压在电网自愈过程中的平稳过渡,而且保证了较大的稳定裕度。

Self-healing ability is an important characteristics and sign of smart grid, and voltage and reactive power control is one of main self-healing function of smart grid. When operating condition of power grid changes, it is necessary to implement the security and self-healing of grid voltage by new voltage control strategy that is matching with current operation mode. Based on existing reactive power optimization algorithm, according to voltage sensitivity the voltage variations at nodes is obtained, and taking the minimum variance between nodal voltages and voltage expectation values as objective function the action sequence of control devices is solved by dynamic programming. Simulation results of IEEE 30-bus system show that the proposed method is correct and effective, by which not only the smooth transition of voltage during self-healing process can be implemented, but also a wider voltage stability margin can be ensured.