• Title, Summary, Keyword: instantaneous reactive power rotating reference frame

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A Sensorless Speed Control of an Interior Permanent Magnet Synchronous Motor based on an Instantaneous Reactive Power (순시 무효전력을 이용한 매입형 영구자석 동기 전동기의 센서리스 속도제어)

  • Kang Hyoung-Seok;Joung Woo-Taik;Kim Young-Seok
    • The Transactions of the Korean Institute of Electrical Engineers B
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    • v.55 no.2
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    • pp.107-115
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    • 2006
  • In this paper, a new speed sensorless control based on an instantaneous reactive power is proposed for the interior permanent magnet synchronous motor(IPMSM) drives. In proposed algorithm, the current observer estimates the line currents and the estimated speed can be yielded from the voltage equation because the information of speed is included in back EMF. To implement speed sensorless control, the current observer is composed by using the voltage equation of the IPMSM in the stationary reference frame fixed to the stator. The estimated speed of the rotor is composed by using the voltage equation of the IPMSM in the rotating reference frame fixed to the rotor The estimated speeds to minimize the speed error compensated by using the instantaneous reactive power. The instantaneous reactive power is calculated on the rotating reference frame fixed to the rotor. The effectiveness of the preposed algorithm is confirmed by the experiments.

Single-phase Active Power Filter Based on Rotating Reference Frame Method for Harmonics Compensation

  • Kim, Jin-Sun;Kim, Young-Seok
    • Journal of Electrical Engineering and Technology
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    • v.3 no.1
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    • pp.94-100
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    • 2008
  • This paper presents a new control method of single-phase active power filter (APF) for the compensation of harmonic current components in nonlinear loads. To facilitate the possibility of complex calculation for harmonic current detection of the single phase, a single-phase system that has two phases was constructed by including an imaginary second-phase giving time delay to the load current. The imaginary phase, which lagged the load current T/4 (Here T is the fundamental cycle) is used in the conventional method. But in this proposed method, the new signal as the second phase is delayed by the filter. Because this control method is applied to a single-phase system, an instantaneous calculation was developed by using the rotating reference frames synchronized to source-frequency rather than by applying instantaneous reactive power theory that uses the conventional fixed reference frames. The control scheme of single-phase APF for the current source with R-L loads is applied to a laboratory prototype to verify the proposed control method.

Single-Phase Hybrid Active Power Filter Using Rotating Reference Frame (회전좌표계를 이용한 단상 하이브리드형 능동 전력필터)

  • Kim Jin-Sun;Kim Young-Seok
    • The Transactions of the Korean Institute of Electrical Engineers B
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    • v.54 no.8
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    • pp.377-386
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    • 2005
  • This paper presents the control algorithm of single-phase hybrid active power filter for the compensation of harmonic current components in nonlinear R-L load with passive active Power filters. To construct two phase system, an imaginary second phase was made. In this proposed method, the new signal which is the delayed through the filtering by the phase-delay property of low-pass filter is used as the secondary phase. Because two-phases have the different phase, the instantaneous calculation of harmonic current is possible. In this paper, a reference voltage is created by multiplying the coefficient k by the compensation current using the rotating reference frame synchronized with the source-frequency, not applying to instantaneous reactive power theory which has been used with the existing fixed reference frames In order to verify the validities of the proposed control methods, experiments are carried out with the prototypes of single-phase hybrid active power filter.

New Sensorless Vector Control for Permanent Magnet Synchronous Motor using instantaneous Reactive Power (순시 무효전력을 이용한 영구자석 동기전동기의 센서리스 제어)

  • Jun, Byoung-Ho;Choi, Yang-Kwang;Kim, Young-Seok;Shin, Jae-Wha;Han, Yoon-Seok
    • Proceedings of the KIEE Conference
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    • pp.970-972
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    • 2003
  • This paper presents a new speed sensorless control method of a permanent magnet synchronous motor based on instantaneous reactive power. The proposed algorithm is constructed by instantaneous reactive power in a synchronously rotating reference frame and is not affected by mechanical motor parameters, because mechanical equation is not used. The effectiveness of the proposed system is confirmed by the experimental results.

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Speed Sensorless Control for Interior Permanent Magnet Synchronous Motor based on an Instantaneous Reactive Power and a Fuzzy PI Compensator (순시무효전력과 퍼이 이득 보상기를 이용한 IPMSM의 속도 센서리스 제어)

  • Kang, Hyoung-Seok;Shin, Jae-Hwa;You, Wan-Sik;Kang, Min-Hyoung;Kim, Young-Seok
    • Proceedings of the KIEE Conference
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    • pp.173-174
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    • 2007
  • In this paper, a new speed sensorless control based on an instantaneous reactive power and a fuzzy PI compensator are proposed for the interior permanent magnet synchronous motor (IPMSM) drives. The conventional fixed gain PI and PID controllers are very sensitive to step change of command speed, parameter variations and load disturbance. Also, to the estimated speeds are compensated by using an instantaneous reactive power in synchronously rotating reference frame. In a fuzzy compensator, the system control parameters are adjusted by a fuzzy rule based system, which is a logical model of the human behavior for process control. The effectiveness of algorithm is confirmed by the experiments.

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New Sensorless Control of PMSM using Reactive Power (무효전력을 이용한 영구자석 동기전동기의 새로운 센서리스 제어)

  • Han, Yoon-Seok;Choi, Jung-Soo;Kim, Young-Seok;Shin, Jae-Wha
    • Proceedings of the KIEE Conference
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    • pp.237-239
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    • 2001
  • This paper presents a new speed sensorless control method of permanent magnet synchronous motors based on instantaneous reactive power. The proposed system is constructed in a synchronously rotating reference frame and is very simple. The new approach is not dependent upon the stator resistance, nor is it affected by mechanical motor parameters. The effectiveness of the proposed system is confirmed by the simulation results.

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A Control Algorithm of Single Phase Active Power Filter based on Rotating Reference Frame (회전좌표계를 이용한 단상능동전력필터의 제어이론)

  • Kim, Jin-Sun;Kim, Young-Seok;Shin, Jae-Hwa
    • Proceedings of the KIEE Conference
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    • pp.1480-1482
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    • 2005
  • The major causes of power quality deterioration are harmonic current through semiconductor switching device, due to use of nonlinear loads such as diodes rectifier or thyristor rectifiers. In response to this concerns, this paper presents a new control method of single-phase active power filter(APF) for the compensation of harmonic current components in nonlinear loads. In order to make the complex calculation to be possible, the single-phase system that has two phases was made by constructing a imaginary second-phase giving time delay to load currents. In the conventional method, a imaginary-phase lagged to the load current T/4(here T is the fundamental cycle) was made. But in this proposed method, the new signal, which has the delayed phase through the filter, using the phase-delay property of low-pass filter, was used as the second phase. As this control method is applied to the system of single phase, an instantaneous calculation was done rather by using the rotating reference frames that synchronizes with source-frequency than by applying instantaneous reactive power theory that uses the conventional fixed reference frames.

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Sensorless Control of IPMS on an Instantaneous Reactive Power Preceding Initial Position Estimation and Parameter Measurement (초기위치 추정 및 파라미터 계측을 선행하여 순시무효전력을 이용한 IPMSM의 센서리스 제어)

  • Kim, Won-Suk;Joung, Woo-Talk;Kim, Young-Seok
    • Proceedings of the KIEE Conference
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    • pp.207-209
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    • 2005
  • Recently, the use of IPMSM is coming to be active, in many industrial applications. In sensorless drive of IPMSM, it is important to know the exact information of the initial rotor position, because the wrong estimation of the initial rotor position brings about the decrease of the starting torque, or a temporary reverse revolution, In addition, PMSM is necessary to use the accurate information of the inductance for the precise torque control owing to the reluctance torque. In this paper presents initial rotor position estimation method and, measure method of the each-axis inductance. And to minimize the speed estimations error, the estimated speeds are compensated by using an instantaneous reactive power in synchronously rotating reference frame.

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New Sensorless Control Strategy for a Permanent Magnet Synchronous Motor based on an Instantaneous Reactive Power (순시무효전력을 이용한 영구자석 동기전동기의 새로운 센서리스 제어)

  • 최양광;김영석;한윤석
    • The Transactions of the Korean Institute of Electrical Engineers B
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    • v.53 no.4
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    • pp.247-254
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    • 2004
  • The mechanical informations such as the rotor speed and angle are required to operate the Cylindrical Permanent Magnet Synchronous Motor(PMSM). A resolver or encoder is typically used to supply the mechanical informations. This position sensor adds length to the machine, raises system cost, increases rotor inertia and requires additional devices. As the result, there has been a significant interest in the development of sensorless strategies to eliminate the position sensor. This paper presents an implementation of the new sensorless speed comtrol scheme for a PMSM. In the proposed algorithm, the line currents are estimated by a observer and the estimated speed can be yielded from the voltage equation because the information of speed is included in back emf. But the speed estimation error between the estimated and the real speeds is occured by errors due to measuring the motor parameters and sensing the line current and the input voltage. To minimize the speed estimations error, the estimated speeds are compensated by using an instantaneous reactive power in synchronously rotating reference frame. In this paper, the proposed algorithm is not affected by mechanical motor parameters because the mechanical equation is not used. The effectiveness of algorithm is confirmed by the experiments.

Power Quality Impacts of an Electric Arc Furnace and Its Compensation

  • Esfandiari Ahmad;Parniani Mostafa;Mokhtari Hossein
    • Journal of Electrical Engineering and Technology
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    • v.1 no.2
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    • pp.153-160
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    • 2006
  • This paper presents a new compensating system, which consists of a shunt active filter and passive components for mitigating voltage and current disturbances arising from an Electric Arc Furnace (EAF). A novel control strategy is presented for the shunt active filter. An extended method based on instantaneous power theory in a rotating reference frame is developed for extraction of compensating signals. Since voltages at the point of common coupling contain low frequency interharmonics, conventional methods cannot be used for dc voltage regulation. Therefore, a new method is introduced for this purpose. The passive components limit the fast variations of load currents and mitigate voltage notching at the Point of Common Coupling (PCC). A three-phase electric arc furnace model is used to show power quality improvement through reactive power and harmonic compensation by a shunt active filter using the proposed control method. The system performance is investigated by simulation, which shows improvement in power quality indices such as flicker severity index.