Analysis on the distribution network with distributed generators under phase-to-phase short-circuit faults

作者：Wu, Zhengrong; Wang, Gang^*; Li, Haifeng; Pan, Guoqing; Gao, Xiang

来源：Proceedings of the CSEE, 2013, 33(1): 130-136.

• 10kV distribution network
• Built in
• Common source
• Control schemes
• Distributed generators
• Equivalent model
• Fault analysis
• Fault characteristics
• Fault ride-through
• Negative sequence voltage
• Point of common coupling
• Positive voltage
• Precise method
• Sequence control
• Short-circuit fault
• Unsymmetrical faults
• Voltage control current sources
• Voltage source converters

The fault current of the distributed generators(DG) with voltage source converter (VSC) is determined by its control scheme. However, the traditional equivalent model for DGs didn't distinguish the DGs from common source. Thus, the effect of control scheme was neglected and this caused significant limitations on fault analysis of distribution network with DGs, especially in the case of unsymmetrical fault analysis. For this reason, this paper analyzed the control scheme and fault characteristics under phase-to-phase short-circuit faults, then put forward a voltage control current source equivalent model for DGs under positive sequence control. Based on this, the equations between the positive, negative sequence voltages of the point of common coupling (PCC) and DGs'currents were built. The solving equations for the positive voltage of PCC were built under different phase-to-phase short-circuits. Thus, the precise method for fault analysis under phase-to-phase short-circuit faults was obtained. A 10kV distribution network case was built in DIgSILENT and the proposed method was verified to be correct.

• 出版日期2013-1-5
• 单位华南理工大学