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고품질 전력공급을 위한 독립형 마이크로그리드의 전압제어 해석
조종민,이학주,신창훈,차한주,Jo, Jongmin,Lee, Hakju,Shin, Chang-hoon,Cha, Hanju 한국전력공사 2016 KEPCO Journal on electric power and energy Vol.2 No.2
This paper analyzes voltage control method in order to supply high-quality power for stand-alone microgrid. Stand-alone microgrid is composed of battery bank, stand-alone PCS and controllable loads. The main role of stand-alone PCS is to supply high-quality power to loads as main source by using stable voltage method regardless of load conditions. In particularly, output voltage of stand-alone PCS gets severely unbalanced voltage under unbalanced loads. Fundamental positive and negative sequences are transformed by two coordinates transformation which are rotated in each opposite direction, respectively. Each fundamental d-q voltage is regulated by each fundamental PI control. In addition, low-order harmonics are compensated through resonant controllers. Performance of stand-alone microgrid is tested for feasibility, and it is verified that output voltage of THD is improved to 1% from 2.2% under 50 kW balanced load, and is improved to 1.1% from 2.6% under 50 kW unbalanced load.
조종민(Jongmin Jo),이우종(Wujong Lee),이일용(Ilyong Lee),맹창엽(Changyeop Maeng),김동섭(Dongsub Kim),조성수(Seongsoo Cho) 대한전기학회 2021 전기학회논문지 Vol.70 No.3
This paper studies and proposes some algorithm for voltage regulation of distributed energy resource in distribution system from a electric power corporate point of view. In a recent situation, as the level of connection of distributed energy resource to the distribution system increases, the voltage excess problem is frequently occurring. Therefore, electric power corporate need a way to solve the voltage excess problem. In this paper, KEPCO propose a voltage regulation control algorithm for the photovoltaic inverter that can improve the renewable capacity of the low-voltage system. This paper examines a method to improve the capacity of renewable energy of the power system, where it increases the power generation utilization rate of renewable power owners comparing and evaluating the voltage regulation effect of the extra-high-voltage and low-voltage systems by controlling the reactive power of the solar inverter. In particular, a voltage regulation control algorithm of the solar inverter was proposed in order to improve the voltage control effect of the low voltage system, and the effect was evaluated and analyzed in the low voltage system model.