倪泽宇,季亮,施佳斌,陶小杰,曹喆.基于PQMS电压信息的有源配电网故障定位方法[J].电测与仪表,2020,57(14):51-56. Ni Zeyu,Ji Liang,Shi Jiabin,Tao Xiaojie,Cao Zhe.Fault location method in active distribution network based on voltage information of PQMS[J].Electrical Measurement & Instrumentation,2020,57(14):51-56.
Fault location method in active distribution network based on voltage information of PQMS
通过建立逆变型分布式电源(Inverter Interfaced Distributed Generation, IIDG)在低电压穿越控制下的(Low Voltage Ride Through, LVRT)故障输出模型,利用电能质量检测装置(PQMS)的电压信息,建立故障定位评估函数,提出了一种含逆变型DG配电网的故障定位新方法。论文首先研究了逆变型DG的低压穿越控制策略,建立逆变型DG的故障特征模型,分析对称及非对称故障条件下输出特性。然后利用含逆变型DG的配电网模型,分析不同故障条件下的故障特征。通过分析故障分量网络,建立节点电压关于故障距离与过渡电阻的方程,通过改进的粒子群算法求解精确故障距离。该方法考虑了故障条件下DG输出特性对于配电网故障定位的影响,利用故障网络的节点电压分布函数,解决了低电压穿越运行下的逆变型DG有源配电网故障定位问题。最后,在DigSilent软件中构建了带有逆变型DG的IEEE33配电网仿真系统,验证所提方法的有效性与准确性。
In this paper, by establishing the Low Voltage Ride Through (LVRT) fault output model of Inverter Interfaced Distributed Generation (IIDG), the voltage information of the power quality detection device (PQMS) is used to establish the fault. Based on the location evaluation function, a new fault location method for inverter-type DG distribution network is proposed. Firstly, the paper studies the low-voltage ride-through control strategy of inverter DG, establishes the fault characterization model of inverter DG, and analyzes the output characteristics under symmetrical and asymmetrical fault conditions. Then use the distribution network model with inverter type DG to analyze the fault characteristics under different fault conditions. By analyzing the fault component network, the equation of the node voltage with respect to the fault distance and the transition resistance is established, and the precise fault distance is solved by the improved particle swarm optimization algorithm. The method considers the influence of DG output characteristics on fault location of distribution network under fault conditions. Using the voltage information of PQMS, it solves the fault location problem of inverter DG active distribution network under low voltage ride through operation. Finally, an IEEE33 distribution network simulation system with inverter DG is built in DigSilent software to verify the effectiveness and accuracy of the proposed method.