基于同步相量测量的配电网孤岛多源协同控制方法

有功-相角下垂控制避免了将频率作为下垂量所引起的频率偏差问题,但同时导致了系统有功功率在分布式电源(distributed generations,DGs)之间难以精确分配。基于有功相角下垂控制,提出了一种基于微型同步相量测量的有功补偿控制方法。该控制方法根据量测的公共母线上电压相角信息,调节各个DG的相角参考值趋于一致,最终可以使所有DG的有功出力根据其下垂系数精确分配。为提升配电网孤岛系统的动态性能,对系统进行了小信号动态建模以对系统进行动态性能分析。此外,基于小信号模型,建立了补偿控制参数优化模型,可求解出使系统动态性能最优的控制参数。最后通过基于PSCAD/EMTDC平台的时域仿真结果验证了所提方法的有效性。

Multi-source Coordinated Control Method Based on PMU for Islanded Distribution Network

Angle droop control can avoid frequency deviation caused by frequency droop, but it causes inaccurate active power sharing among distributed generations(DGs). Based on the angle droop control, this paper presents a compensation method based on micro phasor measurement unit(μPMU). The control method adjusts the phase angle reference values of each DG unit according to the measured voltage phase angle information on the common bus such that the active power output of all the DGs can be accurately shared according to droop coefficient. To improve the dynamic performance of islanded distribution network, a small-signal dynamic model is developed and corresponding stability analysis is presented. In addition, based on the small-signal dynamic model, the control parameter selection problem is formulated as an optimization problem. Finally, simulation results in PSCAD/EMTDC platform are provided to validate feasibility of the proposed control method.