• 제목/요약/키워드: phase controller

검색결과 1,377건 처리시간 0.039초

Implementation of Digital Phase Controller of Thyristor by using FPGA in HVDC System

  • Kim, Dong-Youn;Kim, Jang-Mok;Kim, Chan-Ki
    • 전력전자학회:학술대회논문집
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    • 전력전자학회 2012년도 추계학술대회 논문집
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    • pp.169-170
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    • 2012
  • This paper presents implementation of digital phase controller for thyristor by using FPGA (Field Programmable Gate Array) in HVDC system. Implementation of digital HVDC system is possible by using superior digital simulator such as RTDS (Real Time Digital Simulator). But thyristor phase controller is typically implemented by analog circuit, because it is difficult to implement the phase controller with low operating speed of RTDS. To guarantee high control performance, phase controller needs fast operating speed. This paper presents FPGA based digital phase controller to obtain high speed and high performance. The entire digital simulation of the HVDC system is also implemented by interfacing between FPGA based phase controller and RTDS. Proposed digital HVDC simulator is verified through RTDS simulation.

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Fuzzy 제어기를 이용한 7상 BLDC 전동기 속도제어 구동시스템 (Driving System of 7-Phase BLDC Motor Speed Control by Fuzzy Controller)

  • 윤용호
    • 전기학회논문지
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    • 제66권11호
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    • pp.1663-1668
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    • 2017
  • A BLDC motor with higher number of phases has several advantages, compared to the conventional three-phase BLDC motors. It can reduce the commutation torque ripple and the iron loss without increasing the voltage per phase and increase the reliability and power density. Higher number of phases increase the torque-per-ampere ratio for the same machine volume and output power by widening the electrical conduction period. In this paper, the proposed seven-phase BLDC motor drive system is made into several functional modular blocks, so that it can be easily extended to other ac motor applications: back-EMF block, hysteresis current control block, pwm inverter block, phase current block, and speed/torque control block. Also in a system of BLDC motor drive, the PI controller has been widely used in the speed controller because of the simple implementation. To obtain a good speed response in a general drive system using the PI controller, the high bandwidth of a controller is established. therefore, in this paper, a Fuzzy controller is applied to the 7-phase BLDC motor drive system in order to improve the speed control performance. The Fuzzy controller is compared with a conventional PI controller through the experiment with respect to speed dynamic responses. These experimental results show that the Fuzzy controller of the 7-phase BLDC motor drive system is superior over the conventional PI controller. The algorithm using the Fuzzy controller can improve a comfortable ride in the field of high performance 7-phase BLDC motor drive applications.

불평형 부하에서 강인한 3상4족 전압형 인버터를 위한 하이브리드 제어기의 설계 (Design of the Robust Hybrid Controller for Three-Phase Four-Leg Voltage Source Inverter under the Unbalance Load)

  • 도안반투안;최우진
    • 전력전자학회:학술대회논문집
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    • 전력전자학회 2014년도 전력전자학술대회 논문집
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    • pp.291-292
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    • 2014
  • The three-phase four-leg voltage source inverter (VSI) topology can be an interesting option for the three phase-four wire system. With an additional leg, this topology can achieve superior performance with unbalanced and/or nonlinear load. This paper proposes a new hybrid controller which combines PI controller and resonant controller in synchronous frame for three phase four leg inverter. The hybrid controller is simple in structure and easy to implement. The performance of proposed controller is verified by the experiments and compared with that of the conventional PI controller.

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초음파 모터 구동을 위한 단순화된 디지털 주파수/위상차/전압 제어기 (A Simplified Digital Frequency/Phase/Voltage Controller for the Traveling Wave Type Ultrasonic Motor Drive System)

  • 이을재;김영석
    • 전력전자학회논문지
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    • 제4권3호
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    • pp.285-293
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    • 1999
  • 본 논문에서는 인버터를 사용하여 진행파형 초음파 모터를 구동할 때에 구동 주파수, 위상차 및 상간의 전압을 제어하기 위해 새로운 방식의 초음파 모터 구동용 디지털 제어기를 제안하였다. 제안된 디지털 제어기는 주파수 발생과 위상차 제어를 하기 위하여 기존의 제어기에서 사용한 디지털-아날로그 혼합 방식이 아닌 디지털 논리에 의하여 출력이 발생되며 이로 인하여 제어기의 구성이 대폭 단순해진 특징을 갖는다. 제안된 디지털 제어기는 두 가지 형태로 주파수와 위상만을 제어하기 위한 경우와 상간의 전압까지 제어하기 위한 경우로 분리하였다. 실험에서는 상용 LSI와 EPLD를 사용하여 구현된 단순화된 디지털 제어기의 성능을 평가하였다.

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Design of compact phase controller for pulse tube refrigerator

  • Ki, Tae-Kyung;Jeong, Sang-Kwon
    • 한국초전도ㆍ저온공학회논문지
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    • 제13권2호
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    • pp.25-28
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    • 2011
  • A compact phase controller of pulse tube refrigerator is proposed in this paper. Most pulse tube refrigerators available now consist of a long inertance tube and reservoir as the phase controller. The long inertance tube and reservoir present a challenge for compact packaging in some applications. To overcome this disadvantage, the long inertance tube and reservoir are replaced with the compact phase controller consisted of mass, spring and damper in pulse tube refrigerator. This process is achieved using similarity of mechanical, electrical, and acoustic system and the specific configuration of the compact phase controller is designed. From the simulation code in this paper, the performance of pulse tube refrigerator with the designed compact phase controller is confirmed to be comparable to pulse tube refrigerator with the long inertance tube and reservoir.

Battery Energy Storage System Based Controller for a Wind Turbine Driven Isolated Asynchronous Generator

  • Singh, Bhim;Kasal, Gaurav Kumar
    • Journal of Power Electronics
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    • 제8권1호
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    • pp.81-90
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    • 2008
  • This paper presents an investigation of a voltage and frequency controller for an isolated asynchronous generator (IAG) driven. by a wind turbine and supplying 3-phase 4-wire loads to the isolated areas where a grid is not accessible. The control strategy is based on the indirect current control of the VSC (voltage source converter) using the frequency PI controller. The proposed controller consists of three single-phase IGBT (Insulated Gate Bipolar Junction Transistor) based VSC, which are connected to each phase of the IAG through three single phase transformers and a battery at their DC link. The controller has the capability of controlling reactive and active powers to regulate the magnitude and frequency of the generated voltage, harmonic elimination, load balancing and neutral current compensation. The proposed isolated system is modeled and simulated in MATLAB using Simulink and PSB (Power System Block-set) toolboxes to verify the performance of the controller.

디지털제어기를 기반으로 하는 단상 능동전력필터 (Single-Phase Active Power Filter based on Digital Controller)

  • 배병열;이지헌;이혜연;주영아;한병문;박병주;윤동철
    • 전기학회논문지
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    • 제57권5호
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    • pp.789-796
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    • 2008
  • This paper describes a single-phase active power filter based on a newly developed digital controller. The developed controller utilizes FFT(Fast Fourier Transform) algorithm to extract the reference signal from the load current, considering the phase-angle delay of each order of harmonics. Optimized technique was applied for whole control algorithm to implement the real-time operation of developed controller. The performance of developed controller for a single-phase active power filter was verified through computer simulations with PSCAD/EMTDC. The feasibility of hardware implementation was confirmed by building and testing a prototype. The developed digital controller for a single-phase active power filter can compensate the harmonic current generated by the power supply for digital equipment.

PID 제어기를 갖는 구간 플랜트의 강인안정화 기법 (A method of robust stabilization of the interval plants with a PID controller)

  • 강환일
    • 전자공학회논문지S
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    • 제34S권10호
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    • pp.52-58
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    • 1997
  • In this paper, we consider methods of robust stabilization of the interval plant with a PID controller. Suppose that we know apriori a sign of the coefficients of the numerator of the PID controller. Under this condition, it sufficies to make eight polynomials stable for robust stabilization of the interval plant with a minimum phase PID controller. In addition, with a nonminimum phase PID controller, it suffices to make different eight polynomials stable. Especially, with the nonminimum phase PID controller it is shown that stabilization of eight plants is necessary and sufficient for robust stabilization of the interval plants.

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3상 모듈형 UPS용 PFC 제어기 설계 (PFC Controller Design for 3-Phase Modular UPS)

  • 박내춘;김상훈;지준근
    • 전력전자학회:학술대회논문집
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    • 전력전자학회 2010년도 추계학술대회
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    • pp.44-45
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    • 2010
  • In this paper a new PFC Controller for 3-Phase Modular UPS is proposed. The PFC circuit for 3-Phase Modular UPS is implemented using three 1-phase 3-level boost PFC circuits. To control DC output voltage and AC input current, single voltage controller considering imbalance of two capacitor voltages and three independent current controllers are used in proposed PFC controller.

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Hardware-Based Implementation of a PIDR Controller for Single-Phase Power Factor Correction

  • Le, Dinh Vuong;Park, Sang-Min;Yu, In-Keun;Park, Minwon
    • 한국산업정보학회논문지
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    • 제21권4호
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    • pp.21-30
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    • 2016
  • In a single-phase power factor correction (PFC), the standard cascaded control algorithm using a proportional-integral-derivative (PID) controller has two main drawbacks: an inability to track sinusoidal current reference and low harmonic compensation capability. These drawbacks cause poor power factor and high harmonics in grid current. To improve these drawbacks, this paper uses a proportional-integral-derivative-resonant (PIDR) controller which combines a type-III PID with proportional-resonant (PR) controllers in the PFC. Based on a small signal model of the PFC, the type-III PID controller was implemented taking into account the bandwidth and phase margin of the PFC system. To adopt the PR controllers, the spectrum of inductor current of the PFC was analyzed in frequency domain. The hybrid PIDR controller were simulated using PSCAD/EMTDC and implemented on a 3 kW PFC prototype hardware. The performance results of the hybrid PIDR controller were compared with those of an individual type-III PID controller. Both controllers were implemented successfully in the single-phase PFC. The total harmonic distortion of the proposed controller were much better than those of the individual type-III PID controller.