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- 저자 : E. Muljadi (검색결과 2 건)
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J. Kim,E. Muljadi 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5
Growing penetration level of power converterbased renewable sources (PCBRSs), which are promising to replace rotating system inertia, will bring a gap in frequency response of a power system. The frequency response of future systems might be considerably dynamic. Thus, the variability of the power output from these technologies has expanded the need for increased power system flexibility; fortunately, PCBRSs and energy storages are capable of providing flexible ancillary services on the frequency response. This paper proposes a dynamic transmission control (DTC) of PCBRSs with energy storages for short-term frequency support. The DTC is a conceptual upper-level controller that coordinates the outputs of PCBRSs based on the system frequency and dynamic capabilities of the PCBRSs. Thus, the DTC enables a group of the PCBRSs to provide harmonious collective output as a virtual synchronous power plant, which is more flexible than the conventional power plants.
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Flicker Mitigation for a Grid-Connected Tidal and River Power Generator Using the BESS
S. Seo,J. Kim,E. Muljadi,S. Meor-Danial,M. Worthington,R. Wills 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5
In the grid-connected tidal and river power generation, the water turbulence and the grid condition can induce the fluctuating output power. This power fluctuation may cause a power quality issue such as flicker, or voltage fluctuations, during the continuous operation. Hence, it is important to assess flicker emission and to mitigate flicker in order to solve this power quality issue. This paper proposes a Battery Energy Storage System (BESS) installed between the power converters of the tidal and river power system in order to mitigate flickers in different grid conditions. The BESS smooths the active power fluctuations and reduces flicker even from the weak grid with the low impedance angle in the distribution network. The feasibility of the proposed BESS system has been tested using a simplified simulation model with interconnected inverters developed in the validated simulation tool of PSCAD/EMTDC, and the obtained results from the case studies are presented.
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