光伏、风机等分布式电源的大量接入引起的网损增加和电压越限给配电网的安全经济运行带来了新的挑战。为此，文中提出一种配电网无功功率的分散控制策略，每个分布式电源仅根据自身所在节点的同步相量测量数据以及周边负荷节点广播的电压越限警报信息调节无功功率输出，在避免负荷节点出现电压越界的同时最小化系统有功网损。该方法根据配电网的线性化模型，利用分布式电源所在节点的电压相量估计全网有功网损对本地无功输出的灵敏度，从而通过本地无功控制最小化有功网损。文中还给出了分布式电源对负荷节点进行电压支撑的最优策略，以最小的有功网损代价修复负荷节点的低电压问题。相比既有的基于反馈控制的分布式无功控制策略，文中方法利用本地控制即可实现网损的最小化，因此不需要分布式电源之间的互相通信; 分布式电源接收到负荷节点的低电压警报后，通过一次调节即可修复低电压，因此无需长时间监测负荷节点的电压。

The increase of system loss and voltage out-off-limit caused by the massive access of distributed power sources such as photovoltaic and wind turbine bring new challenges to the secure and economical operation of distri-bution networks． This study put forward a decentralized reactive power control strategy for distribution systems to address this problem．According to the strategy，each distributed generator only regulate the reactive power accord-ing to the local synchronous phasor measurement data and the low-voltage alarm broadcasted by the surrounding load buses to minimize the total active power loss and maintain nodal voltages in the system． The proposed strategy estimates the sensitivity of the system loss with aspect to local reactive injection according to the linearized distribu-tion network model using the local voltage phasor measurement． Then it minimizes the total active loss with local re-active power control． The optimal voltage support strategy for load buses by distributed generators is presented to re-pair the low-voltage of load buses with the minimum power loss cost． As compared with the existing distributed re-active power regulation strategy based on feedback control，the proposed strategy can minimize the system loss with local reactive power control，so there is no communication requirement between distributed generators． After receiv-ing the low-voltage alarm of the load buses，the low-voltage can be maintained by only one regulation，so there is no need to monitor the load node's voltage for a long time．