• Title/Summary/Keyword: MPP+

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Optimization technique of POS MPPT operational characteristics for grid-connected PV generation system (계통 연계형 태양광발전시스템을 위한 POS MPPT 운전특성 최적화 기법)

  • Park, Sang-Soo;Kim, Sang-Yong;Jang, Seong-Jae;Kim, Gyeong-Hun;Seo, Hyo-Ryong;Park, Min-Won;Yu, In-Keun
    • Proceedings of the KIEE Conference
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    • 2009.07a
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    • pp.1064_1065
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    • 2009
  • PV (Photovoltaic) power generation system has been widely studied as a clean and renewable power source. Tracking the MPP (maximum power point) of a PV array is usually an essential part of a PV system. This paper describes POS (Photovoltaic Output Sensorless) MPPT method and optimization technique of its operational characteristics for grid-connected PV generation system. A DC-DC converter has been used to step-up the PV voltage and DC-AC converter has been used for connecting the system to the grid. Optimization technique has been implemented to optimize the current and voltage controller gain parameters and duty ratio increment of DC-DC converter. Simulation results reveal that the proposed control has better response.

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Absorption Characteristics of Micro-perforated Panel Absorber According to High Incident Pressure Magnitude and Variation of Geometric Parameters (높은 입사 음압 및 설계 인자의 변화에 따른 미세 천공판 흡음 기구의 흡음 특성)

  • Park, Soon-Hong;Seo, Sang-Hyun
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.21 no.11
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    • pp.1059-1066
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    • 2011
  • The micro-perforated panel absorber(MPPA) is one of promising noise control elements because of its applicability to extreme environments where general porous materials cannot be used. Since the MPPA is inherently non-porous sound absorber, it can be a good candidate of acoustic protection system of a space launcher. The overall sound pressure level inside payload fairings of commercial launch vehicles is so high(around 140 dB OASPL) that the conventional linear impedance model cannot be directly applied to the design of the acoustic protection systems. In this paper an acoustic impedance models of a micro-perforated panel absorber at high sound pressure environment were reviewed and the use of the impedance on the practical design of MPPAs was addressed. The variation of absorption characteristics of MPPA was discussed according to the design parameters, e.g., perforation ratio, the minute hole diameter, the thickness of MPP and the incident sound pressure level.

Flyback Inverter Using Voltage Sensorless MPPT for Photovoltaic AC Modules

  • Ryu, Dong-Kyun;Choi, Bong-Yeon;Lee, Soon-Ryung;Kim, Young-Ho;Won, Chung-Yuen
    • Journal of Power Electronics
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    • v.14 no.6
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    • pp.1293-1302
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    • 2014
  • A flyback inverter using voltage sensorless maximum power point tracking (MPPT) for photovoltaic (PV) AC modules is presented. PV AC modules for a power rating from 150 W to 300 W are generally required for their small size and low price because of the installation on the back side of PV modules. In the conventional MPPT technique for PV AC modules, sensors for detecting PV voltage and PV current are required to calculate the PV output power. However, system size and cost increase when the voltage sensor and current sensor are used because of the addition of the auxiliary circuit for the sensors. The proposed method uses only the current sensor to track the MPP point. Therefore, the proposed control method overcomes drawbacks of the conventional control method. Theoretical analysis, simulation, and experiment are performed to verify the proposed control method.

A Study on Micro-Converter of Photovoltaic System for Efficiency Progress (태양광발전시스템의 효율 향상을 위한 마이크로컨버터에 관한 연구)

  • Chae, Young-Kee;Lim, Jung-Yeol
    • Journal of IKEEE
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    • v.18 no.1
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    • pp.159-164
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    • 2014
  • This paper targets the development of micro-converter such as a power converter for photovoltaic module. In corresponding to the poor performance of centralized PV system under partial shading, the power converter for single PV module to maximize the energy harvest from PV module. The power converter is constantly tracking the maximum power point of photovoltaic system and increases energy output power. To minimize the quantity of devices and switchs, 320W solar micro-converter is developed using synchronous rectifier. From the basis of these results, through simulations and experiments were verified efficiency.

Multi-level Modeling and Simulation for Sustainable Energy (대체 에너지의 다중레벨 모델링과 시뮬레이션)

  • van Duijsen, P.J.;Oh, Yong-Taek
    • The Journal of Korean Institute for Practical Engineering Education
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    • v.3 no.1
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    • pp.15-24
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    • 2011
  • Modeling and simulation for Green Energy depends largely on the type of system under investigation. The topics are very wide ranging from semiconductor physics (solar), electrical motor/generator (wind turbines), power electronics (grid connections) to typical control strategies. To correctly model these technologies requires a broad set of models and various simulation techniques. To further refine or detail the simulation the modeling has to be performed on a specific level, being system, circuit or component level. Combinations of several levels allows gradually improving the validity of the overall model against available parameters and model equations.

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Reliability-Based Design Optimization Using Kriging Metamodel with Sequential Sampling Technique (순차적 샘플링과 크리깅 메타모델을 이용한 신뢰도 기반 최적설계)

  • Choi, Kyu-Seon;Lee, Gab-Seong;Choi, Dong-Hoon
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.33 no.12
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    • pp.1464-1470
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    • 2009
  • RBDO approach based on a sampling method with the Kriging metamodel and Constraint Boundary Sampling (CBS), which is sequential sampling method to generate metamodels is proposed. The major advantage of the proposed RBDO approach is that it does not require Most Probable failure Point (MPP) which is essential for First-Order Reliability Method (FORM)-based RBDO approach. The Monte Carlo Sampling (MCS), most well-known method of the sampling methods for the reliability analysis is used to assess the reliability of constraints. In addition, a Cumulative Distribution Function (CDF) of the constraints is approximated using Moving Least Square (MLS) method from empirical distribution function. It is possible to acquire a probability of failure and its analytic sensitivities by using an approximate function of the CDF for the constraints. Moreover, a concept of inactive design is adapted to improve a numerical efficiency of the proposed approach. Computational accuracy and efficiency of the proposed RBDO approach are demonstrated by numerical and engineering problems.

The characteristic analysis of POS (PV Output Sensorless) MPPT based 3 phase grid connected PV system (PV Output Sensorless(POS) MPPT법이 적용된 3상 계통연계형 태양광 발전시스템의 특성해석)

  • Park, Sang-Soo;Kim, Gyeong-Hun;Kim, Sang-Yong;Jang, Seong-Jae;Seo, Hyo-Ryong;Park, Min-Won;Yu, In-Keun
    • Proceedings of the KIEE Conference
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    • 2008.07a
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    • pp.1081-1082
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    • 2008
  • Photovoltaic (PV) power generation system has been widely studied as a clean and renewable power source. The purpose of this study is to keep the output power of photovoltaic cells maximum under any weather conditions. There are so many MPPT (Maximum Power Point Tracking) methods. P&O method has been used as a key MPPT method, both voltage and current coming out from PV array have to be feedback in the method. Thus, the system has a complex structure, and may fail to track MPP of PV array when unexpected weather conditions happen. In order to reduce the feedback components, POS MPPT control method was proposed by the authors. In this paper, the authors apply the POS MPPT control method to three phase PCS system. And the effectiveness of the proposed control scheme is demonstrated through PSCAD/EMTDC simulation.

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Development of MPPT Control Algorithm for PV System with Robust in Environment Variation (환경변화에 강인한 태양광 발전의 MPPT 제어 알고리즘 개발)

  • Jang, Mi-Geum;Ko, Jae-Sub;Choi, Jung-Sik;Kang, Sung-Jun;Baek, Jeong-Woo;Mun, Ju-Hui;Chung, Dong-Hwa
    • Proceedings of the KIPE Conference
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    • 2010.07a
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    • pp.93-94
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    • 2010
  • This paper proposes maximum power point tracking(MPPT) control algorithm of PV system using a novel method. The proposed hybrid method is composed perturb and observe (PO) method and constant voltage(CV) method. PO method is simple to realize and CV method is possible to tracking MPP with low insolation. Response characteristics of proposed algorithm is compared to conventional PO method with insolation variation. This paper proves the validity of proposed algorithm through the analysis result.

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Enhanced Simulated Annealing-based Global MPPT for Different PV Systems in Mismatched Conditions

  • Wang, Feng;Zhu, Tianhua;Zhuo, Fang;Yi, Hao;Fan, Yusen
    • Journal of Power Electronics
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    • v.17 no.5
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    • pp.1327-1337
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    • 2017
  • Photovoltaic (PV) systems are influenced by disproportionate impacts on energy production caused by frequent mismatch cases. The occurrence of multiple maximum power points (MPPs) adds complexity to the tracking process in various PV systems. However, current maximum-power point tracking (MPPT) techniques exhibit limited performance. This paper introduces an enhanced simulated annealing (ESA)-based GMPPT technique against multiple MPP issues in P-V curve with different PV system structures. The proposed technique not only distinguishes global and local MPPs but also performs rapid convergence speed and high tracking accuracy of irradiance changing and restart capability detection. Moreover, the proposed global maximum power tracking algorithm can be applied in the central converter of DMPPT and hybrid PV system to meet various application scenarios. Its effectiveness is verified by simulation and test results.

Absorption Characteristics of Micro-perforated Panel Absorber According to Incident Pressure Magnitude and Its Geometric Parameters (가진 음압 및 설계 인자에 따른 미세 천공판 흡음 기구의 흡음 특성)

  • Park, Soon-Hong;Seo, Sang-Hyun
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2011.10a
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    • pp.178-185
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    • 2011
  • The micro-perforated panel absorber (MPPA) is one of promising noise control elements because of its applicability to extreme environments where general porous materials cannot be used. Since the MPPA is inherently non-porous sound absorber, it can be a good candidate of acoustic protection system of a space launcher. The overall sound pressure level inside payload fairings of commercial launch vehicles is so high (around 140 dB OASPL) that the conventional linear impedance model cannot be directly applied to the design of the acoustic protection systems. In this paper an acoustic impedance models of a micro-perforated panel absorber at high sound pressure environment were reviewed and the use of the impedance on the practical design of MPPAs was addressed. The variation of absorption characteristics of MPPA was discussed according to the design parameters, e.g., perforation ratio, the minute hole diameter, the thickness of MPP and the incident sound pressure level.

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