Impact on Power Quality of Photovoltaic Systems on Distribution Networks

摘要

This paper presents a comprehensive power quality analysis of the impact of high penetration rates of photovoltaic generation on distribution networks. A PV generator with two-stage converter and the control system involved in generating the PWM switching signals is developed in an electromagnetic transient simulation program based on a PSCAD/EMTDC platform. The IEEE 34-node distribution feeder, which incorporates voltage regulators, is used to investigate the proliferation of PV systems on a distribution network. The effects on voltage profiles, voltage unbalance, harmonics, as well as on the operation of tap position on voltage regulators are analysed. Results indicate that reverse active and reactive power flows may appear at the transformer substation of the distribution feeder, whereas the power factor may change from lagging to leading. Further, harmonic injection and voltage unbalance remain below guidelines limits.