This paper describes the power system study required by Malaysian Sustainable Energy Development Authority (SEDA) prior to the Distributed Generation (DG) interconnection. A number of DG interconnection guideline and document are described. A case study is used to demonstrate the procedure of steady state analysis. Load flow analysis under steady state conditions and short circuit analysis are discussed. Lastly, the simulation results are presented.
One of the major concerns for the interconnection of distributed generation (DG) to distribution network is the technical issues associated from the connection. In the conventional distribution network, the power flow is uni-directional, from centralizes power plants to transmission and then to distribution before it supplied to the customer. However, with the anticipated amount of DG connected at distribution network, power flow is no longer uni-directional. Due to this fact, it is crucial to perform power system study to ensure the system stability is not deteriorating. This paper discusses the dynamic analysis to examine the electromechanical transient responses of the DG unit under various system faults and contingency situations. This contents presented in this paper can facilitate DG developers, consultants, contractor and utility engineer in planning for the new connection of DG to the distribution network.
This paper presents a guideline of determining impedance of transformer when conducting system study for renewable energy interconnection. The method can be used when there is lack of information on the transformer’s technical details. Simulation examples are presented to demonstrate the effect of impedance on the losses and short circuit current. The guidelines introduce in this paper will increase reliability and accuracy of the system study conducted by engineer and researchers in assessing the possible impact renewable energy integration.
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