• Title/Summary/Keyword: Maximum Efficiency Control

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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.

Maximum-Efficiency Tracking Scheme for Piezoelectric-Transformer Inverter with Dimming Control

  • Nakashima Satoshi;Ogasawara Hiroshi;Kakehashi Hidenori;Ninomiya Tamotsu
    • Proceedings of the KIPE Conference
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    • 2001.10a
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    • pp.7-10
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    • 2001
  • This paper provides a solution for the problem of efficiency decrease caused by load variation. A novel control scheme of tracking the PT's operation frequency for the maximum efficiency is proposed. As a result, a high efficiency over $80\%$ has been achieved even under the output-current decrease down to $10\%$ of the full load current.

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Maximum Efficiency Drive of Vector-Controlled Induction Motors (벡터제어 유도전동기의 최대효율 운전)

  • Yoon, Duck-Yong;Choe, Gyu-Ha;Hong, Soon-Chan;Baek, Soo-Hyun;Lee, Eun-Woong
    • The Transactions of the Korean Institute of Power Electronics
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    • v.1 no.1
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    • pp.27-37
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    • 1996
  • This paper proposes the control algorithm for maximum efficiency drive of PWM inverter - induction motor system with high dynamic performance. If the induction motor is driven under light load with rated magnetizing current, the Iron loss is excessively large compared with the codder loss which results in doer motor efficiency. Maximum efficiency drive of an induction motor can be achieved by controlling the magnetizing current to satisfy the optimal ratio that leads the total motor loss to be a minimum value at a given speed. The proposed control algorithm essentially uses vector control technique and adopts voltage decoupling control strategy to prevent the degradation of dynamic performance due to reduced magnetizing current. To verify the proposed method, digital simulations and experiments are carried out for a squirrel-cage induction motor with the rating of 2.2[kW].

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Fast Maximum Efficiency Control of Vector-Controlled Induction Motor Drives (유도전동기의 신속한 최대효율제어)

  • Shin, Myoung-Ho
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.23 no.8
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    • pp.21-25
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    • 2009
  • Magnetic fluxes for maximum efficiency are calculated at five operating points as speed and torque are varied. The surface of magnetic flux for maximum efficiency is calculated by using the five points, Then, maximum efficiency control is fulfilled with the magnetic flux calculated from the surface of magnetic flux at a given speed and torque. Simulation results verify the effectiveness of the proposed method.

Improved Maximum Efficiency Control of a Stator Flux-Oriented Induction Motor Drive (유도전동기 고정자자속기준제어의 개선된 최대효율제어)

  • Shin, Myoung-Ho
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.22 no.5
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    • pp.58-63
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    • 2008
  • A fast maximum efficiency control scheme of a stator flux-oriented control of an induction motor is proposed. Three inputs of given three magnetic fluxes are calculated. Then magnetic flux for minimum input is calculated by quadratic interpolation method and maximum efficiency control is fulfilled with the calculated magnetic flux for minimum input. Simulation results verify the effectiveness of the scheme.

A Study on the MPPT Control Algorithm and Efficiency Evaluation Method (MPPT제어 알고리즘 고찰 및 효율시험 평가법)

  • 유권종;김기현;정영석;김영석
    • The Transactions of the Korean Institute of Power Electronics
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    • v.6 no.2
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    • pp.164-172
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    • 2001
  • This paper describes common MPPT(Maximum Power Point Tracking) control algorithm; Constant Voltage Control, P&O(Perturbation and Observation), IncCond(Incremental Conductance), and investigated it\`s efficiency. Though simulation and efficiency evaluation, the steady/transient states characteristics and efficiency of control algorithms are analyzed respectively. Also, two-mode MPPT control to improve on the existing control algorithm. Moreover, is proposed for high efficiency this paper suggests a topology for MPPT measuring efficiency and a method of examination.

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The effect on the seasonal performance of an inverter compressor with higher and lower operating range (인버터 압축기의 저속과 고속운전범위가 계절성능에 미치는 영향)

  • 박윤철;하도용;민만기
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.10 no.2
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    • pp.173-179
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    • 1998
  • An experimental study was conducted on the effect of compressor capacity control range of heat pump on the seasonal energy efficiency ratio with variation of the maximum and minimum compressor input frequencies. To obtain seasonal energy efficiency ratio, steady state test at the maximum, minimum and intermediate compressor speed and cyclic test at the minimum compressor speed should be conducted. Maximum input frequency was varied to 95Hz, 105Hz, and 115Hz, and the minimum input frequency was varied to 35Hz, 45Hz, and 55Hz. The seasonal energy efficiency ratio increased as the input frequency of the compressor decreased. The maximum input frequency had only slight effects on the SEER.

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Cooling Efficiency of Low Pressure Compressed Air Fogging System in Naturally Ventilated Greenhouses (저압 에어포그 시스템을 설치한 온실의 냉방효율)

  • Nam, Sang-Woon;Kim, Young-Shik;Sung, In-Mo;Ko, Gi-Hyuk
    • Journal of The Korean Society of Agricultural Engineers
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    • v.54 no.5
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    • pp.49-55
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    • 2012
  • In order to derive the efficient utilization of low pressure compressed air fogging system, cooling efficiencies with control types were analyzed through cooling experiments in tomato greenhouses. The control types were set up with temperature control, humidity control, temperature and humidity control, and time control. It showed that the cooling effects were 0.7 to $3.3^{\circ}C$ on average and maximum of 4.3 to $7.0^{\circ}C$, the humidification effects were 3.5 to 13.5 % on average and maximum of 14.3 to 24.4 %. Both the cooling and humidification effect were the highest in the time control method. The cooling efficiency of the air fogging system was not high with 8.3 to 27.3 % on average. However, the cooling efficiency of 24.6 to 27.3 % which appears from the time control is similar to the cooling efficiency of high pressure fogging system experimented in Japan. The air fogging system is operated by low pressure, but its efficiency is similar to high pressure. We think because it uses compressed air. From this point of view, we suggest that the air fogging system can get the cooling efficiency of similar levels to that of high pressure fogging system and it will have an advantage from clogging problem of nozzle etc.

Technique to Solve Problems Due to Load Increment in Maximum Efficiency Control of Stator Flux-Oriented Induction Motor Drive (유도전동기 고정자자속 기준제어의 최대효율제어에서 부하증가로 인한 문제 해결방법)

  • Shin, Myoung-Ho
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.21 no.3
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    • pp.69-74
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    • 2007
  • Flux level is low in the maximum efficiency control of a stator flux-oriented control of induction motor under the light load. In this cast if the loaf torque is suddenly increased, torque component current is limited to the low level by torque-limit condition because of the low flux level. In this paper, a technique to solve the problem is proposed.

Maximum Efficiency Control of an Induction Motor Drive by Parameter Adaptive Compensation (파라미터 적응보상에 의한 유도전동기의 최대효율 제어기법)

  • Shon, Jin-Geun;Choi, Myung-Gyu;Park, Jong-Chan;Na, Chae-Dong;Lee, Sung-Bum
    • Proceedings of the KIEE Conference
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    • 2000.07e
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    • pp.162-166
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    • 2000
  • In this paper, a maximum efficiency control technique of real-time processing in which parameter variation is compensated in vector control of an induction motors(I.M.) is proposed. Based on equivalent model of I.M., a loss minimization factor(LMF) with the variations of speed is derived. To solve problem of inaccuracy of LMF curves due to machine parameter variation, rotor resistance estimation is performed by using instantaneous reactive power. The estimated rotor resistance values are applied to the maximum efficiency control with a LMF.

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