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전기저장장치를 이용한 태양광전원이 연계된 배전계통 수용성향상 방안에 관한 연구
남양현(Yang-Hyun Nam),최성식(Sung-Sik Choi),강민관(Min-Kwan Kang),이후동(Hu-Dong Lee),박지현(Ji-Hyun Park),노대석(Dae-Seok Rho) 대한전기학회 2018 전기학회논문지 Vol.67 No.8
If large-scale PV systems are continuously interconnected to distribution system, customer voltages could violate the allowable voltage limit(220±13V) according to reverse power flow of PV system. In order to solve these problems, this paper proposes flexible adoption evaluation algorithm of PV system in distribution system which estimates proper introduction capacity and location of ESS(energy storage system) for keeping customer voltages within allowable voltage limit based on various operating scenarios related with connecting point and capacity of PV system. And also this paper proposes modeling of ESS, SVR(step voltage regulator) and PV system using PSCAD/EMTDC S/W and analyzes characteristics of customer voltages and the adoption ability of PV system in distribution system. From the simulation results, it is confirmed that proposed algorithm is useful for large-scale adoption of PV system in distribution system to maintain customer voltages within allowable voltage limit.
전력회사와 발전사업자 측면에서 도서지역용 마이크로그리드의 경제성평가 알고리즘
남양현(Yang-Hyum Nam),이후동(Hoo-Dong Lee),김유림(Yu-Rim Kim),마리토(Ferrira Marito),김미영(Mi-Young Kim),노대석(Dae-Seok Rho) 대한전기학회 2017 전기학회논문지 Vol.66 No.7
Recently, regulation on carbon emissions has been strengthened according to the new climate change convention (COP21) held in Paris, and then Korea has decided to reduce CO2 emissions by 37% until 2030. As one of countermeasures, the government has energetically performed demonstration projects of island micro-grid including solar power, wind power and energy storage system. However, in order to smoothly introduce island micro-grid, it is a critical issue to carry out the economic evaluation for power utility aspect and independent power producer aspect. Therefore, this paper proposes economic evaluation algorithms of island micro-grid which are based on the present worth method, considering cost and benefit factors in the aspect of both sides. Firstly, in case of power utility this paper proposes algorithm to estimate a period of return on investment according to the introduction capacity of distributed generators replacing diesel generator. And also, in case of independent power producer, this paper proposes evaluation algorithm to estimate weighting factor of SMP and benefit rate based on break-even point related with cost and benefit. From a case study result on real island micro-grid model, it is confirmed that proposed algorithms are useful and practical for the economic evaluation of island micro-grid.