微电网并网运行时的电压稳定控制

Voltage Stability Control of Grid-Connected Microgrid

研究微电网内的扰动源以及电压波动的关联因素。分析微电网内各种功率输出设备的特性,提出微电网电压控制设备类型的选择原则。根据配电调度是否对微电网与配电网的交换功率存在约束,分别提出有交换功率约束和无交换功率约束2种条件下微电网电压的控制策略。研究微电网内可能存在的可控静止无功补偿装置在微电网电压稳定控制中的作用以及参与电压控制的策略。建立并网运行的微电网模型,通过数字仿真的方法对2种条件下大、小扰动对微电网电压的影响进行辅助分析,并且验证了控制策略的有效性。提出配电网发生稳定问题时,微电网在服从于配电网稳定控制策略下的控制措施和调节原则。

The relation factor of disturbance sources and voltage fluctuation in microgrid was studied, the characteristics of power output devices were analyzed, and the selection principle of the type of voltage control equipment was proposed. According to whether the distribution scheduling has constraint on the exchange power between microgrid and distribution network, this paper proposed two voltage control strategies respectively for the microgrid with exchanging power constraint or without exchanging power constraint. Then, the effect of controlled static reactive compensation device on the voltage stability control in microgrid was studied, as well as its participation in voltage control strategy. The model of grid-connected microgrid was established. The influences of large and small disturbance on microgrid voltage under two conditions were analyzed through digital simulation method, and the effectiveness of the control strategy was verified. Finally, this paper proposed the control measure and regulation principle for the microgrid that was subject to the stability control strategy of distribution network, when the stability problem of distribution network occurred.