• 한국기후변화학회지
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• 제6권2호
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• pp.105-111
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• 2015

With PV market extension, Operation & Maintenance (O&M) went on the floor as an effective method so solve the reduction phenomenon of Performance Ratio (PR) of PV power plant and as a new business model of photovoltaic industry. This study chose institutionalization of O&M to vitalize domestic photovoltaic industry improving level of photovoltaic technology and dominate the market in advance. The result of analyzing advanced researches and domestic cases indicates that O&M is essential of operating PV power plant, therefore, now is the time for a systematic approach to establish O&M policy.

• Current Photovoltaic Research
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• 제9권2호
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• pp.36-44
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• 2021

To endorse the reliability and durability of the solar photovoltaic (PV) device several tests were conducted before exposing to the outdoor field in a non-ideal condition. The PV module has high probability that intend to perform adequately for 30 years under operating conditions. To evaluate the long term performance of the PV module in diversified terrestrial conditions, one should use the outdoor performance data. However, no one wants to wait for 25 years to determine the module reliability. The accelerating stress tests performing in the laboratory by mimicking different field conditions are thus important to understand the performance of a PV module. In this review, we will discuss briefly about different accelerating stress types, levels and prioritization that are used to evaluate the PV module reliability and durability before using them in real field.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2006년도 제37회 하계학술대회 논문집 A
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• pp.537-538
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• 2006

태양광 발전시스템의 성능평가 및 분석을 위하여 실증단지 및 시범사업으로 설치 운영하고 있으며, 주택용 3KW 계통연계형 태양광 발전시스템도 10만호 보급사업의 일환으로 추진 중에 있다. 본 논문에서는 이와 같이 추진 중인 3KW 태양광 발전시스템의 기본구성과 설치된 PV시스템의 각종 구성요소 기기 특히 계통연계형 인버터에 대하여 알아보며, 실증시험을 위하여 설치된 모니터링 시스템에서 수집된 데이터를 토대로 PV시스템의 성능을 위한 운전 특성을 분석하였다.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2008년도 추계학술대회 논문집
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• pp.209-211
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• 2008

일반적으로 3상 계통연계형 PV 시스템용 PCS는 2-레벨 인버터 회로를 채용하고 AC 출력 선전류의 제어를 통하여 PV-array의 DC 출력을 계통측으로 발전시키는 형태로 구성된다. 이러한 전력변환 회로는 스위치 회로의 한 암에서 고장 시 시스템의 정상적인 발전이 어려운 단점을 가진다. 본 연구에서는 이러한 단점을 개선하기 위해 모듈형 3상 계통연계 태양광 발전 시스템용 PCS 및 제어방법을 제안하고 시뮬레이션을 통해 타당성을 검증한다.

• Journal of Advanced Marine Engineering and Technology
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• 제29권5호
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• pp.579-586
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• 2005

Recently, it has demanded to the wireless monitoring system in stand-alone PV power generation system. We propose the multiplex monitoring method using RF unit of low-price. RF unit consists of RF modem and communication controller. It is also able to use by repeater to communicate long distance. In this paper. two algorithms were programmed by CCS-C and C++ for multiplex monitoring method, The algorithm of choosing unit was used 'select and poll method' and the course assignment algorithm was embodied with 'Bellman-Ford algorithm'. The good result was achieved in the actual test without communication-data lose. The proposed method will be applied such as monitoring system of PV light on the wayside, monitoring system of unmanned lighthouse, monitoring system of refrigeration container on vessel and so on. It can be applied in the field that various ocean energy system.

• 한국수소및신에너지학회논문집
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• 제29권4호
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• pp.363-369
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• 2018

This paper considers the alternative way to mitigate cost for REC instead of Photovoltaic (PV) panels with Energy Storage System (ESS). This study starts from an economic analysis of a 1 megawatt PV system without ESS. Several assumptions have been applied in consideration of the current domestic situation. Based on this result, the economic efficiency of PV with ESS improved. However, the reliance on government subsidies was very high. The alternative way to cover the fluctuation power from renewable energy was reviewed with economical and technical way. In case the natural gas engine applied to PV, the IRR and Levelized Cost of Electricity (LCOE) can be improved without ESS. And if small amount of additional REC, the IRR can be improved up to investment level.

• 한국태양에너지학회 논문집
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• 제29권2호
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• pp.70-75
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• 2009

In this experiment, we did sampling 6 kinds of photovoltaic modules and analyzed the discrepancy of measurement results between l laboratory and 4 PV makers to have performance repeatability at Standard Test Condition(STC) condition. From the KIER's results, Korea's standard test laboratory, other laboratory showed -10% measurement variation. The causes came from correction of reference cell, test condition and the state of skill. Form the comparison test, we analyzed the problems. But three PV maker reduced measurement variation, other one PV maker and one test laboratory didn't improve the problems of correction of reference cell, test condition and the state of skill. Also, High Efficiency Module had a big discrepancy of -10.0$\sim$-6.2% among 3 laboratories which have a less than 10msec light pulse duration time. This made low spectrum response speed so the Fill Factor decreased maximum output power under 10msec light pulse duration time

• 전력전자학회논문지
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• 제16권6호
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• pp.618-626
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• 2011

태양전지는 미래에너지를 위한 중요한 신재생에너지원이다. 본 논문에서는 태양광 발전 (PV PCS)를 위한 2단구성 DC/DC컨버터와 동작제어를 제안한다. 넓은 입력전압 제어범위를 갖는 제안된 DC/DC컨버터는 1차 병렬 2차 직렬로 연결된 Two Tank LLC공진컨버터와 Interleaved 승압 컨버터로 구성되어있고, 태양광모듈 전압범위에 따라 하나의 시스템 또는 두 개의 시스템으로 동작시켜 전체 평균효율을 증가시키는 방법을 제안한다. 제안된 컨버터에 대한 동작특성에 대해 분석, 서술되어 있으며, 2.2kW급 시제품 제작 및 실험을 통하여 적용 가능함을 보였다.

• 한국태양에너지학회 논문집
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• 제27권1호
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• pp.39-45
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• 2007

In this paper, we analyzed the elements of measurement uncertainty on electrical performance test which are the most important things in photovoltaic module performance test. Repeating the performance test by 6 men, the measurement uncertainty could be calculated. In this experiment, Solar Simulator (A-Class pulse type) used for domestic certificate test of PV module is Pasan IIIb (Balval, Switzerland). The possible elements of the measurement uncertain that could effect electrical performance test of PV module are reference cell, spectrum correction, error from measurement repetition, test condition, stability and uniformity of artificial solar simulator. To find the measurement uncertainty, 6 men repeated the test by 10 times. And the results were that numerical average value was 124.44W and measurement uncertainty was $124.44W{\pm}0.36W$ with 95% confidence level for 125W PV module(KD-5125).

• 신재생에너지
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• 제8권3호
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• pp.14-22
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• 2012

Performance of photovoltaic (PV) generator systems relies on its operating conditions. Maximum power extracted from PV generators depends strongly on solar irradiation, load impedance, and ambient temperature. A most maximum power point tracking (MPPT) algorithm is based on a perturb and observe method and an incremental conductance method. It is well known the latter is better in terms of dynamics and tracking characteristics under condition of rapidly changing solar irradiation. However, in case of digital implementation, the latter has some error for determining a maximum power point. This paper presents a PID based MPPT algorithm for such PV systems. We use neural network technique for determining PID parameters by online learning approach. And we construct a boost converter to regulate the output voltage from PV generator system. Computer simulation is carried out to evaluate the proposed MPPT method and we accomplish comparative study with a perturb and observe based MPPT method to prove its superiority.