• Title/Summary/Keyword: inverter control system

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Angle Control for SRCI Fed Induction Motor Drive (SRCI 구동 유도전동기 시스템의 Angle Control)

  • 김인동;조규형
    • The Transactions of the Korean Institute of Electrical Engineers
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    • v.37 no.12
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    • pp.854-861
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    • 1988
  • The current source inverter-fed induction motor(CSIM) drive is widely used in industry because of its four quadrant operation, fuseless protection, fuseless protection, and ruggedness. the CSIM drive system, however, has shortcomins such as slow response and dynamic stability to load torque disturbance and reference speed change. Such a disadvantages can be compensated considerably by means of introducing additional angle angle control loop. The angle control method is dependent upon the inverter type. In this paper, simultaneus recovery and commutation inverter(SRCI) which is developed recently is considered.

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Design and Implementation of a Low Cost Grid-Connected 5 kVA Photovoltaic System with Load Compensation Capability

  • Mejdar, Reza Seifi;Salimi, Mahdi;Zakipour, Adel
    • Journal of Power Electronics
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    • v.16 no.6
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    • pp.2306-2314
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    • 2016
  • Design and implementation of a low cost grid-connected 5kVA solar photovoltaic (PV) system is proposed in this paper. Since the inverter is a major component of the PV system, the B4 inverter used in this paper reduces the total cost of the PV system. In order to eliminate the massive transformer, the PV system is connected to the grid through IGBT switches. In addition to injection of active power into the grid, the B4 inverter can compensate reactive power and reduce harmonics of the nonlinear loads. A TMS320F28335 DSP processor is used for effective control of the B4 inverter. Various features of this processor enable the implementation of the necessary control algorithms. As a first step, the PV system is simulated and evaluated in Matlab/Simulink. In the second step, hardware circuits are designed and implemented based on the simulation results. The operation of the PV system has been evaluated under balanced, unbalanced, linear and nonlinear loads which proves its accuracy and efficiency.

Superheat Control of an Inverter-driven Heat Pump Using PI Control Algorithm

  • Park, Jong-Min;Kim, Yong-Chan
    • International Journal of Air-Conditioning and Refrigeration
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    • v.10 no.2
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    • pp.106-115
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    • 2002
  • The performance of an inverter-driven water-to-water heat pump with an electronic expansion valve (EEV) was measured as a function of compressor frequency, load conditions, and EEV opening. Based on the test results, a controller using proportional integral (PI) feedback or PI feedforward algorithm was designed and tested to investigate capacity modulation and transient response control of the system. Although the relation between superheat and EEV opening of the heat pump showed nonlinear characteristics, a control gain obtained at the rated frequency was applicable to various operating conditions without causing large deviations. When the simple PI feedback control algorithm was applied, a large overshoot of superheat and wet compression were observed due to time delay effects of compressor frequency. However, applying PI feedforward control scheme yielded better system performance and higher reliability, compared to the PI feedback algorithm.

A Scheme of EDTC Control using an Induction Motor Three-Level Voltage Source Inverter for Electric Vehicles

  • Zaimeddine, R.;Berkouk, E.M.;Refoufi, L.
    • Journal of Electrical Engineering and Technology
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    • v.2 no.4
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    • pp.505-512
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    • 2007
  • The object of this paper is to study a new control structure for sensorless induction machines dedicated to electrical drives using a three-level voltage source inverter VSI-NPC. The amplitude and the rotating speed of the flux vector can be controlled freely. The scheme investigated is an Enhanced direct torque control "EDTC" for electric vehicle propulsion. The considered application imposes some constraints which are achieved in EDTC control (fast torque response, optimal switching logic, torque control at zero speed, and large speed control. The results obtained for an induction motor indicate superior performance over the FOC type without need for any mechanical sensor.

The Design of Low-Cost Vector-Controlled Inverter for Induction Motor Using ARM Cortex-M4 Microcontroller (ARM Cortex-M4 마이크로컨트롤러를 사용한 유도전동기의 저가형 벡터제어 인버터 설계)

  • Kim, Dong-Ki;Yoon, Duck-Yong
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.14 no.2
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    • pp.816-821
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    • 2013
  • This paper proposes the design method of low-cost vector control system for induction motor using the ARM Cortex-M4 microcontroller. This MCU can be used instead of expensive DSP to control the home appliances such as refrigerator, air conditioner, washing machine and so on. This paper explains the major features of Cortex-M4 for motor control and how to realize a vector-controlled inverter using it. The developed system is applied to 3-phase induction motor of 200[W] and experimental results show good performance similar to the system using TMS320F28335 DSP.

Photovoltaic System for SPIM Vector control (SPIM 벡터제어를 위한 태양광 발전 시스템)

  • Ko, Jae-Sub;Choi, Jung-Sik;Jung, Byung-Jin;Kim, Do-Yeon;Park, Ki-Tae;Choi, Jung-Hoon;Chung, Dong-Hwa
    • Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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    • 2007.11a
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    • pp.295-299
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    • 2007
  • This paper presents the photovoltaic(PV) water pumping system with a maximum power point tracking(MPPT). The wale- pumping system uses a variable speed single phase induction motor(SPIM) driven a centrifugal pimp by field oriented control(FOC) inverter. The MPPT using a DC-DC converter controlled the duty cycle to track maximum power from PV under different insolation conditions. The duty cycle directly relate with a flux producing current control($i_{ds}$). The FOC inverter uses a current control voltage source inverter(CC-VSI). The simulation results are shown that the characteristics and performance of drive system, which varies as each conditions of light by expresses in voltage ($V_{dq}$), current($I_{dq}$), speed of motor and torque.

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DSP Control of Three-Phase UPS Inverter with Output Voltage Harmonic Compensator (3상 UPS 인버터의 출력전압 왜형률 개선을 위한 고조파 보상기법의 DSP 제어)

  • 변영복;조기연;박성준;김철우
    • Proceedings of the KIPE Conference
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    • 1997.07a
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    • pp.269-275
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    • 1997
  • This paper presents real time digital signal processor(DSP) control of UPS system feeding processor(DSP) control of UPS system feeding nonlinear loads to provide sinusoidal inverter output voltage. The control scheme is composed of an rms voltage compensator, the load current harmonics feed-forward loop for the cancellation of output voltage harmonics, and the output voltage harmonics feedback loop for system stability. The controller employs a Texas Instruments TMS320C40GFL50 DSP.

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Development of Inverter Controlled Air Pressure Type Water-Supply and Determination of Optimal Operation Pressure (무접점 공기압력식 급수시스템 개발 및 최적운전점 결정)

  • Kim, Jung-Hoon;Kim, Hak-Bong
    • Proceedings of the KIEE Conference
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    • 1994.11a
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    • pp.181-183
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    • 1994
  • This paper presented the developments and operations of control system for Inverter-controlled air pressure type water-supply systems. The developed controller that enables regular speed and variable speed. In addition, an air supplement control system was developed to establish a utility model of water supply facility system as well as a method to optimize its operation.

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The Flicker Control by Feed-forward for Stabilization of CVCF Inverter (철도차량용 보조전원장치의 전향제어를 이용한 Flicker 제어)

  • 박채운;신형진;조국춘;원충연
    • Proceedings of the KSR Conference
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    • 1999.11a
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    • pp.267-272
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    • 1999
  • The auxiliary power supply system fur passenger service of railway car has been developed from MA(Motor-Alternator) to CVCF Inverter (Static Inverter). Generally, a customer wants to apply tile new control method and device for auxiliary power supply of railcar However, if the auxiliary power supply is supplied to extended existing line, the maintenance cost of the old system is less expensive than new developed system, so, the customer specifies that the auxiliary power supply has compatibility with existing one completely. At that time, the hardware is nearly same as existing system except small changes of accessories for better performance. This paper describes the flicker control using feed-forward method of auxiliary power supply system for new 50 electric railcars, which are delivered to Korean National Railroad (KNR) Kwa-chon Line. The existing power supply system has damping resistor box to stabilize the DC input (1.5 ㎸). At this time, for better system efficiency the new system has not include resistor box but new control method including feed-forward control is applied. This control algorithm realizes the better stabilization of input power compared to the result of the existing system, which includes resistor box

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The Power Analysis and Its Control of Two-phase Orthogonal Power Supply for the Continuous Casting

  • Ma, Fujun;Luo, An;Xiong, Qiaopo
    • Journal of Electrical Engineering and Technology
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    • v.10 no.3
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    • pp.971-982
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    • 2015
  • In order to improve the quality of the billet continuous casting, a two-phase orthogonal power supply (TPOPS) for electromagnetic stirrer is researched, which is composed of three-phase PWM rectifier and three-leg inverter. According to the power analysis of system, the ripple of dc-link voltage is analyzed and its analytical expression is derived. In order to improve the performance of electromagnetic stirring, an integrated control method with feedforward control is proposed for PWM rectifier to suppress the fluctuations of dc-link voltage and provide a stable dc source for inverter. According to the simplified equivalent model, a composite current control method is proposed for inverter. This proposed method can combine the merits of feedforward control with feedback control to effectively improve the dynamic output performance of TPOPS. Finally, a 300kVA prototype of TPOPS is developed, and the results have verified the analysis and control method.