基于主动配电网运行特性的电压质量评估

Power Quality Evaluation in Active Distribution Network Based on Its Operation Characteristics

主动配电网(active distribution network,ADN)在元件故障时可以主动组网隔离故障,实现部分持续供电。基于这一主动运行特性,计及主动配电网的多运行状态,提出了主动配电网的电压质量评估方法。首先对元件的状态持续时间抽样得到系统的状态与持续时间序列,并对系统各运行状态进行拓扑辨识和导纳参数辨识;然后对分布式电源的出力和负荷采用拉丁超立方抽样,孤岛模式下计及功率平衡原则执行储能和负荷的协调控制,得到分布式电源、储能和负荷的功率;最后对各运行状态进行概率潮流计算,对电压幅值结果进行统计分析,并用提出的节点电压偏差风险和孤岛节点失电率指标进行电压质量评估。将所提方法应用到基于RBTS-Bus2的主动配电网测试系统中,验证了所提方法的有效性。

When faults occur in active distribution network（ADN）,the isolation of malfunctions can ensure continuous power supply for un-faulted region.Based on these active operation characteristics,this paper proposes an power quality evaluation method for ADN with considering the multi operation states of ADN.Firstly,the state duration of components is sampled,a sequence of the system state and duration can be further obtained,and the topology and parameter identification of network in each state are implemented.Then Latin hypercube sampling is adopted for loads and the distributed generation outputs,and the coordinated control between energy storage and loads is implemented considering the principle of power balance in the island mode,so that the power of the distributed generation,energy storage and loads can be obtained.Finally,we calculate the probabilistic power flow under each running state,statistically analyze the voltage amplitude results,and use the proposed indexes of voltage deviation risk and island node outage probability to evaluate the voltage quality.The application in the ADN test system based on RBTS-Bus2 proves the efficiencies of the proposed method.