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The introduction of Feed in Tariff (FiT) by Malaysian Government in December 2011 has resulted in the increasing number of distributed generators (DG) connected to the existing radial low voltage (LV) distribution network. It is important to investigate the technical issues caused by anticipated amount of DG, in order to ensure the safety, reliability, and efficiency of the power system. The paper describes a simulation work based on a commercial and residential LV distribution network in the state of Selangor. Both centrally and non-centrally planned distributed generators are studied to investigate the positive and negative impacts of DG connected to the LV distribution network. The voltage unbalance factor in LV distribution network with different penetration level of DG is studied. In addition, the LV network with DGs is also used to minimize the network power losses. The power factor and the voltage unbalance factor at point of coupling are studied. Finally, this simulation work is extended to assess how the cable length from substation to the point of coupling affects the voltage unbalance in the network.

Impacts of Centrally and Non-centrally Planned Distributed Generation on Low Voltage Distribution Network