The ever increasing share of renewable energy sources (RERs) in the today’s scenario, the power grids are suffering from poor power quality due to the intermittent nature of wind and solar based power generating units. The led to extensive research in the field of power quality especially in voltage and frequency regulations Distributed generation involving RERs has become more popular in recent years due to technological advancement and has been started increasingly used in industry. It has become more important to understand the integration of these systems through PE interface with the existing electric power systems networks. At the same time, high frequency switching of Power Electronic interface has caused major Power Quality concerns, which has been tackled with the help of Custom power devices interfaces that has allowed DG to offers various benefits like ability to provide ancillary services, increased energy efficiency, increased functionality through improved power quality and voltage/VAR support, improved electrical system reliability by reducing the fault contributions, and flexibility in operations with various other DE sources. DG also allows the customer to have a choice while it reduces the overall interconnection costs. This paper focuses on widespread use of DG through various Renewable Energy Sources, Power Quality issues associated with the use of Power Electronic interface and use of various Custom Power Devices to improve Power Quality. It particularly evaluates the role of UPQC-DG in various modes of DG in following PQ standards.
Ancillary services, Frequency response, Emulating inertia, Primary frequency control, Wind turbines
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