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태양광 발전시스템의 전력 생산 증대를 위한 Double Band 제어 방식의 적용 및 검증
최종용(Jong-Yong Choi),이현재(Hyun-Jae Lee),박대전(Dae-Jeon Park),손진근(Jin-Geun Shon) 대한전기학회 2023 전기학회논문지 P Vol.72P No.2
In this paper, we propose a double band control method for increasing power production in a solar power generation system. The double band control method aims to increase power production in the solar power generation system by supplementing various problems of the existing P&O control method. MPPT control is performed so that the solar power generation system can always produce maximum power. Among various MPPT control methods, the most used P&O control method is a method of following MPP by comparing previous voltage and power values with current voltage and power values. A disadvantage of this P&O control method is that power loss occurs according to a voltage reference change value. As a countermeasure against this, the power loss can be minimized by not implementing MPPT by adding the voltage reference change value after finding the MPP point using the double band control method. In addition, to verify this, it was verified through simulation using one PV panel and one flyback converter. Comparative analysis was conducted to obtain the amount of power that can be produced from PV panels under various solar radiation conditions. In addition, a comparative analysis was conducted to obtain the amount of electricity that can be produced from the PV panel when the amount of solar radiation changes. As a result, it was found that the power production increased when the double band control method was used rather than the P&O control method.
태양광 발전 시스템의 MPPT 제어 성능 개선을 위한 추종 안티-와인드업 기법의 적용 및 분석
최종용(Jong-Yong Choi),장한상(Han-Sang Jang),박시효(Si-Hyo Park),손진근(Jin-Geun Son) 대한전기학회 2021 대한전기학회 학술대회 논문집 Vol.2021 No.11
본 논문에서는 태양광 발전 시스템의 MPPT 제어 성능개선을 위해 안티-와인드업 기법을 적용하였을 때의 그 효과를 비교 및 분석하였다. 태양광 발전 시스템의 전력 생산 효율을 높이기 위해서는 PV 패널이 항상 최대전력을 생산할 수 있도록 MPPT(Maximum Power Point Tracking) 제어를 수행해야한다. 이때 전압 레퍼런스가 지속적으로 변화하며 측정된 전압이 변화하는 레퍼런스를 추적하는 성능에 따라 태양광 발전 시스템의 효율이 변화될 수 있다. 이에 따라 본 논문에서는 추종 안티-와인드업 기법을 PI제어기에 적용하여 MPPT 제어의 성능을 개선을 하고자 하였다. MPPT에 추종 안티-와인드업 기법을 적용한 결과 적용하지 않았을 때 보다 전압 제어 성능이 향상된 것을 확인할 수 있었다.
철도차량 보조전원장치의 전압 제어 안정성 증대를 위한 Anti-windup 기법의 적용 및 비교 분석
최종용(Jong-Yong Choi),이수길(Su-Gil Lee),이준희(June-Hee Lee),이현재(Hyun-Jae Lee),손진근(Jin-Geun Shon) 대한전기학회 2021 전기학회논문지 P Vol.70 No.4
In this paper, Application and Comparative Analysis of Anti-windup Method for Improving the Stability of Voltage Control of Auxiliary Power Supplies in Railway System. Because it is easy to design, and the structure is simple, there is a problem in the widely used PI controller to occur. Various problems occur, such as response time delay and overshoot due to integrator windup caused by the accumulation of errors in the integral controller. To improve this, various anti-windup methods have been studied. Among the representative Anti-windup methods, it was checked whether various problems caused by integrator windup could be solved through the conditional integral Anti-windup method and the tracking Anti-windup method and the error control Anti-windup. After confirming through PSIM simulation before hardware experiment, DC power conversion system was designed and improvements were confirmed.
역률 및 고조파 보상을 위한 하이브리드 능동전력필터(HAPF)의 개선된 파라미터 설계 방안
박종욱(Jong-wook Park),이현재(Hyun-jae Lee),최종용(Jong-yong Choi),손진근(Jin-geun Shon) 대한전기학회 2022 전기학회논문지 P Vol.71 No.2
Recently, with the increase of the 4th industrial revolution and electric vehicle infrastructure, the supply of power conversion devices has increased, and accordingly, the amount of reactive power and harmonics flowing into the grid has increased. If the parameter of the passive filter part of the hybrid active power filter for decreasing the THD is not properly designed to match the system, efficiency degradation due to control error and overcompensation of reactive power may occur, leading power factor. In order to properly design the capacity of the passive filter of the hybrid active power filter, this paper proposes a capacity selection method that considers harmonics and reactive power at the same time. The performance when considering the passive filter as the proposed method was compared through simulation. As a result, THD was minimized and the target power factor could be reached.
RIE 표면 텍스쳐링 모양에 따른 결정질 실리콘 태양전지의 영향
박인규,윤명수,현덕환,진법종,최종용,김정식,강형동,권기청,Park, In-Gyu,Yun, Myoung-Soo,Hyun, Deoc-Hwan,Jin, Beop-Jong,Choi, Jong-Yong,Kim, Joung-Sik,Kang, Hyoung-Dong,Kwon, Gi-Chung 한국진공학회 2010 Applied Science and Convergence Technology Vol.19 No.4
다결정 실리콘 웨이퍼 표면에 대면적 reactive ion etching (RIE) 장비로 표면 텍스쳐를 형성한 뒤 태양전지를 제작하였다. 웨이퍼 표면에 텍스쳐를 형성하는 것은 광학적 손실을 줄이기 위해 일반적으로 사용되는 방법으로 alkaline etching이 사용된다. 그러나 다결정 실리콘 태양전지의 경우 재료의 결정 방향에 따라 식각되는 alkaline etching은 텍스쳐링의 모양을 제어할 수 없어 효과적이지 못하다. 이와 달리 플라즈마 식각방법을 사용하면 표면 텍스쳐의 모양을 효과적으로 제어하여 조금 더 낮은 반사율을 얻을 수 있다. 하지만 텍스쳐 모양 조절로 얻은 낮은 반사율이 항상 높은 변환효율을 얻을 수 있는 것은 아니다. 본 연구에서는 대면적 RIE 공정 조건별로 얻은 태양전지 표면 텍스쳐의 모양에 따라 각각의 반사율과 양자효율 및 변환효율이 미치는 영향을 살펴보았다. We fabricated a plasma texturing for multi-crystalline silicon cells using reactive ion etching (RIE). Multi-crystalline Si cells have not benefited from the cost-effective wet-chemical texturing processes that reduce front surface reflectance on single-crystal wafers. Elimination of plasma damage has been achieved while keeping front reflectance to extremely low levels. We will discuss reflectance, quantum efficiency and conversion efficiency for multi-crystalline Si solar cell by each RIE process conditions.