• Title, Summary, Keyword: Maximum efficiency point

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Maximum Efficiency Point Tracking Control Algorithm for Improving Electric Power Transmission Efficiency between Photovoltaic Power Generating system and the Grid (태양광발전시스템과 계통간의 전력 전송 효율 개선을 위한 최대효율점 추적 제어 알고리즘)

  • Kwon, Cheol-Soon;Kim, Kwang Soo;Do, Tae Young;Park, Sung-Jun;Kang, Feel-Soon
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.62 no.3
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    • pp.342-348
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    • 2013
  • It proposes an efficient control algorithm to increase electric power transmission efficiency between photovoltaic power generating system and the grid. The main controller finds a maximum efficiency condition by considering the quantity of power generated from PV arrays, the number of inverters, and efficiency of PV inverter. According to the condition, a relay board arranges a point of contract of PV arrays. By the disposition of PV arrays, it assigns the optimized power on each PV inverter. Operational principle of the proposed maximum efficiency point tracking algorithm is given in detail. To verify the validity of the proposed approach, computer-aided simulation and experiment carried out.

3-Point MPPT Algorithm under Dynamic Irradiation for Photovoltaic PCS (일사량 급변 시 유용한 3-Point 태양광 인버터 MPPT 알고리즘)

  • Kim, Dong-Gyun;Park, Kwan-nam;Cho, Sang-Yoon;Lee, Young-Kwoun;Yu, Gwon-Jong;Song, Seung-Ho;Choy, Ick;Choi, Ju-Yeop
    • Proceedings of the KIPE Conference
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    • pp.469-470
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    • 2016
  • Since efficiency of maximum power point tracking (MPPT) is important for photovoltaic systems, a number of MPPT algorithms have already been researched for other environment, however, the most of MPPT algorithms can't track maximum point in dynamic irradiation. In this paper, P&O and 3-Point MPPT which is more specialized in dynamic irradiation are compared in basis of European Efficiency Test(EN50530). The efficiency of 3-Point MPPT algorithm is proved by simulation and experiment. In result, 3-Point MPPT shows higher efficiency in dynamic irradiation and less affected by environment than P&O.

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Maximum Efficiency Point Tracking Algorithm Using Oxygen Access Ratio Control for Fuel Cell Systems

  • Jang, Min-Ho;Lee, Jae-Moon;Kim, Jong-Hoon;Park, Jong-Hu;Cho, Bo-Hyung
    • Journal of Power Electronics
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    • v.11 no.2
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    • pp.194-201
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    • 2011
  • The air flow supplied to a fuel cell system is one of the most significant factors in determining fuel efficiency. The conventional method of controlling the air flow is to fix the oxygen supply at an estimated constant rate for optimal efficiency. However, the actual optimal point can deviated from the pre-set value due to temperature, load conditions and so on. In this paper, the maximum efficiency point tracking (MEPT) algorithm is proposed for finding the optimal air supply rate in real time to maximize the net-power generation of fuel cell systems. The fixed step MEPT algorithm has slow dynamics, thus it affects the overall efficiency. As a result, the variable step MEPT algorithm is proposed to compensate for this problem instead of a fixed one. The complete small signal model of a PEM Fuel cell system is developed to perform a stability analysis and to present a design guideline. For a design example, a 1kW PEM fuel cell system with a DSP 56F807 (Motorola Inc) was built and tested using the proposed MEPT algorithm. This control algorithm is very effective for a soft current change load like a grid connected system or a hybrid electric vehicle system with a secondary energy source.

A Study on the Instrumentation and Valuation of Photovoltaic Energy Utilization System (태양광발전 에너지이용시스템의 계측과 평가에 관한 연구)

  • Chung, Heun-Sang;Baek, Hyung-Lae;Cho, Geum-Bae;Kim, Dong-Hwi;Kim, Dae-Gon;You, Gwon-Jong
    • Proceedings of the KIEE Conference
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    • pp.496-499
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    • 1991
  • Photovoltaic system has very low energy conversion efficiency and the output characteristics of solar cell is varied by the Insolation quantity and the temperature. In order to improve the efficiency of photovoltaic system, the energy which has got from solar cell must be use maximum. In this paper, it was stimultaneous executed both MPPT control and instrumentation in order that the operating point of solar cell is located maximum power point, using the PWM inverter and micro-computer, which is for the purpose of acquiring maximum power from the solar cell. As a result, maximum power point tracking had carried out and the efficiency of photovoltaic system improved, even if insolation quantity and the temperature are varied.

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A Study on the New Maximum Power Point Tracking and Current Ripple Reduction of Solar Cell for the Grid-connected PV Inverter (계통연계형 태양광 인버터의 새로운 최대 전력점 추종과 태양전지의 전류리플 감소에 관한 연구)

  • Hwang, Uiseon;Kang, Moonsung;Yang, Oh
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.17 no.5
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    • pp.1187-1195
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    • 2013
  • Photovoltaic inverters should always track the maximum power of solar cell arrays in operation. Also, they should be irrespective of the maximum power point voltage of a wide range of solar cells in tracking the maximum power point. If the current ripple of solar cells occurs, the function of maximum power point tracking drops, and normal tracking is difficult when solar radiation or the maximum power point changes. To solve this problem, this paper proposed a new maximum power point tracking algorithm with high efficiency and an algorithm to reduce the current ripple of solar cells. According to the results from the test on 4KW grid-connected PV inverter, the efficiency of maximum power point tracking and inverter output and the total harmonic distortion of inverter output current showed 99.97%, 97.5% and 1.05% respectively. So, the inverter showed excellent performance, and made possible stable maximum power point tracking operation when the solar radiation rapidly changed from 100% to 10% and from 10% to 100% for 0.5 seconds.

MPPT Strategy to Improve Photovoltaic Power Generation Efficiency in Partial Shadows (부분 음영에서의 태양광 발전 효율을 높이기 위한 MPPT 전략)

  • Heo, Cheol-Young;Kim, Yong-Rae;Lee, Young-Kwoun;Lee, Dong-Yun;Choy, Ick;Choi, Ju-Yeop
    • Journal of the Korean Solar Energy Society
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    • v.39 no.2
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    • pp.1-9
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    • 2019
  • In order to increase the power generation efficiency of the photovoltaic system, a new algorithm that can follow the maximum power point of the photovoltaic power generation system having nonlinear output characteristics is proposed. Conventional maximum power point tracking (MPPT) algorithms such as Perturbation and Observation (P&O) and InCond (Increment and Conductance) schemes can not find the global maximum power point at a plurality of pole points in the unmatched state of unbalanced PV modules. However, even if the global maximum power point is found at a plurality of pole points, the global maximum power that can not be the real maximum power by the photovoltaic generation system. In order to solve this problem, a few PV companies propose installing several small PV inverters instead of if big one. However, since this will require additional costs, we herein propose a Multi-MPPT system using individual 3-point MPPT to track true MPPT at a plurality of pole points in the unmatched state of unbalanced PV modules.

A Study on Optimal Current Control Method for Small BLDC Motor Drive (소형 BLDCM 드라이브의 최적 전류제어에 관한 연구)

  • Park, Chang-Seok;Jung, Tae-Uk
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.29 no.4
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    • pp.108-115
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    • 2015
  • This paper proposed a optimal current control method to improve efficiency of BLDC motors. The aim of the proposed method is to use the maximum torque operating method by increasing the effective voltage at the maximum torque point unlike existing SPM operating method. The proposed method is based on existing IPM maximum torque operating method grafting onto a square wave operating of SPM motors. As the method of increasing the effective output voltage from inverter using the maximum torque point, the proposed method is to improve efficiency of BLDC motors using the same amount of the existing current effectively. For this method, the maximum torque point is carried out by FEA and analysis of magnetic flux vector. In this paper, the prototype of general-purpose BLDC drive is manufactured and the performance characteristic and validity are verified.

Optimal Current Control Method of BLDC Motor Utilizing Maximum Torque Point

  • Park, Chang-Seok;Jang, Jung-Hoon;Jung, Tae-Uk
    • Journal of the Korean Society of Industry Convergence
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    • v.20 no.3
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    • pp.213-220
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    • 2017
  • This paper proposes an optimal current control method for improving efficiency of Brushless Direct Current (BLDC) motor. The proposed optimal current control method is based on the maximum torque point analysis of Finite Element Analysis (FEA). The proposed method can increase the effective voltage at the maximum torque point of BLDC motor and increase the output torque per unit current to increase the efficiency. In order to verify the proposed optimal current control method, have developed the prototype of a 50 [W] class motor drive and experimented by 20 [W] motor using the dynamometer set. This was verified.

Comparison Study of Maximum Power Point Tracking Control with Changing of Radiation (일사량 변화에 대한 최대전력점 추종 제어의 비교 연구)

  • Choi, Jung-Sik;Ko, Jae-Sub;Chung, Dong-Hwa
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.59 no.6
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    • pp.1075-1082
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    • 2010
  • This paper analyzes a operating characteristic for maximum power point tracking (MPPT) of photovoltaic generation system. MPPT methods are used to maximize PV array output power by tracking maximum power point(MPP) continuously. To increase the output efficiency of PV system, it is important to have more efficient MPPT. MPPT algorithm is widely used the control method such as the perturbation and observation(PO) method, incremental conductance(IC) method and constant voltage(CV) method. In case of the radiation is changed, this paper proposes a response characteristic with MPPT control algorithms. Also, it proposes the direct for a novel MPPT control algorithm development through the analyzed data, hereby proves the effectiveness of this paper.

The Maximum Efficiency Driving in IPMSM by Precise Estimation of Current Phase Angle

  • Cho, Gyu-Won;Kim, Cheol-Min;Kim, Gyu-Tak
    • Journal of Electrical Engineering and Technology
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    • v.8 no.5
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    • pp.1221-1226
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    • 2013
  • In this paper, the equivalent circuit for the efficiency calculation by precise estimation of the linkage flux, inductance and iron loss resistance was calculated accurately. In addition, the driving characteristics according to the current phase angle are analyzed and the maximum efficiency point is calculated. And then, analyzed and experimental values of the efficiency were compared. So, causes of error were expected to be vibration and noise by harmonic distortion of the voltage and current, and mechanical loss of dynamometer. In addition, the driving characteristics according to the current phase angle are analyzed and the maximum efficiency point is calculated.