• Title/Summary/Keyword: On-Line Parameter Estimation

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A PMSM Driven Electric Scooter System with a V-Belt Continuously Variable Transmission Using a Novel Hybrid Modified Recurrent Legendre Neural Network Control

  • Lin, Chih-Hong
    • Journal of Power Electronics
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    • v.14 no.5
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    • pp.1008-1027
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    • 2014
  • An electric scooter with a V-belt continuously variable transmission (CVT) driven by a permanent magnet synchronous motor (PMSM) has a lot of nonlinear and time-varying characteristics, and accurate dynamic models are difficult to establish for linear controller designs. A PMSM servo-drive electric scooter controlled by a novel hybrid modified recurrent Legendre neural network (NN) control system is proposed to solve difficulties of linear controllers under the occurrence of nonlinear load disturbances and parameters variations. Firstly, the system structure of a V-belt CVT driven electric scooter using a PMSM servo drive is established. Secondly, the novel hybrid modified recurrent Legendre NN control system, which consists of an inspector control, a modified recurrent Legendre NN control with an adaptation law, and a recouped control with an estimation law, is proposed to improve its performance. Moreover, the on-line parameter tuning method of the modified recurrent Legendre NN is derived according to the Lyapunov stability theorem and the gradient descent method. Furthermore, two optimal learning rates for the modified recurrent Legendre NN are derived to speed up the parameter convergence. Finally, comparative studies are carried out to show the effectiveness of the proposed control scheme through experimental results.

Study on the R, L parameter estimation for the high performance current control of the step motor (스텝모터의 고성능 전류제어를 위한 R, L파라미터 추정에 관한 연구)

  • Kwon, Hyuk-Ju;Kim, Hyun Geun;Jin, Sung Min;Kim, Jun Seok
    • Proceedings of the KIPE Conference
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    • 2016.07a
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    • pp.531-532
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    • 2016
  • 본 논문에서는 스텝모터의 고성능 전류제어를 위한 모터의 고정자 저항 및 인덕턴스를 Off-Line추정하는 기법에 대해 기술한다. 모터의 고정자 저항 및 인덕턴스를 추정하기 위해 역기전력이 나타나지 않는 주파수영역에서 AC전압을 인가하고 이때의 전류를 측정한다. 또한, 가상 dq좌표계를 도입하여 정지좌표계상의 저역통과필터를 통해 위상지연 없이 전류신호에 포함된 노이즈를 제거하였으며, DC형태의 전류에 대한 분석을 통하여 정확한 모터의 제정수를 계량하는 기법을 적용하였다.

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Observation and Compensation of Voltage Distortion of PWM VSI for PMSM using Adaptive Control Method (영구자석 동기전동기 구동을 위한 전압원 인버터의 적응제어기법을 이용한 전압 왜곡 관측 및 보상)

  • Kim Hag-Wone;Youn Myung-Joong;Kim Hyun-Soo;Cho Kwan-Yuhl
    • Proceedings of the KIPE Conference
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    • 2004.07a
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    • pp.406-410
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    • 2004
  • Generally, a voltage difference exists between the reference and the output voltagesin a pulse width modulated (PWM) voltage source inverter (VSI). In this paper, the nonlinearity in a PWM VSI is analyzed and a new on-line estimation method in consideration of parameter variations for a permanent magnet synchronous motor (PMSM) is proposed to compensate the time varying voltage distortion.

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Implementation of Self-Tuning Speed Controller for DC Motor Drive System using RLS Algorithm and Pole-Placement Method (RLS 알고리즘과 극점배치방법을 이용한 DC전동기의 자기동조 속도제어기의 구현)

  • Cha, Eung-Seok;Ji, Jun-Keun
    • Proceedings of the KIEE Conference
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    • 1999.11c
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    • pp.488-490
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    • 1999
  • This paper describes the design of self-tuning speed controller for DC motor drive system using RLS(Recursive Least Squares) algorithm and Pole-Placement method. The model parameters, related to inertia and damping coefficient of motor, are estimated on-line by using RLS estimation algorithm. And a control signal is calculated by using pole placement method. Simulation and experimental results show that the proposed controller possesses excellent adaptation capability than a conventional PI/IP controller under parameter change.

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A study on the proceeding direction and obstacle detection by line edge extraction (직선 Edge 추출에 의한 주행방향 및 장애물 검출에 관한 연구)

  • 정준익;최성구;노도환
    • 제어로봇시스템학회:학술대회논문집
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    • 1996.10b
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    • pp.97-100
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    • 1996
  • In this paper, we describe an algorithm which estimate road following direction using the vanishing point property and obstacle detection. This method of detecting the lane markers in a set of continuous lane highway images using linear approximation is presented. This algorithm is designed for accurate and robust extraction of this data as well as high processing speed. Also, this algorithm reckon distance and chase about an obstacle. It include four algorithms which are lane prediction, lane extraction, road following parameter estimation and obstacle detection algorithm. High accuracy was proven by quantitative evaluation using simulated images. Both robustness and the practicality of real time video rate processing were then confirmed through experiment using VTR real road images.

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Active noise control system using modified on-line secondary path modeling method (향상된 온라인 모델링 방법을 이용한 능동 소음 제어 시스템)

  • 박병욱;최태호;김학윤
    • Proceedings of the IEEK Conference
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    • 2003.07e
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    • pp.2200-2203
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    • 2003
  • In an active noise control(ANC) system using the Filtered-X least mean square(LMS) algorithm, the online secondary path modeling method by exploiting a random noise generator is applied. This method is suitable for secondary path modeling. However, it is increased the residual error of the ANC system. In this paper, we presents an ANC system improved online secondary path modeling method which is modified Kuo and Zhang model that is the secondary path estimation by the additive noise. In addition, our proposed model is used that additive noise is transformed into the signal multiplied reference signal by gain control parameter and delayed.

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An Estimation Method of Line Parameter based on Synchrophasor Measurements in Power Systems (시각동기화된 데이터를 이용한 전력계통의 선로정수 추정 방법)

  • Go, Seok-Il;Shim, Kwan-Shik;Jung, Yu-Jin;Gao, Hongchao;Ahn, Seon-Ju;Choi, Joon-Ho
    • Proceedings of the KIEE Conference
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    • 2015.07a
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    • pp.308-309
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    • 2015
  • 본 논문에서는 Synchrophasor에서 취득한 순시치 데이터에 이산푸리에 변환을 적용하여 정확한 실효치 전압과 전류를 계산하고 이를 이용하여 ${\pi}$-등가회로로 모의한 선로의 선로정수를 추정한다. 모의계통을 통해 검증하였다.

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Designing of efficient super-wide bandwidth extension system using enhanced parameter estimation in time domain (시간 영역에서 개선된 파라미터 추론을 통한 효율적인 초광대역 확장 시스템 설계)

  • Jeon, Jong-jeon
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2018.10a
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    • pp.431-433
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    • 2018
  • This paper proposes the system that offer super-wideband speech which is made by artificial bandwidth extension technique using wideband speech signal in time-domain. wideband excitation signal and line spectrum pair(LSP) are extracted based on source-filter model in time-domain. Two parameters are extended by each bandwidth extension algorithms, and then, super-wideband speech parameters are estimated. and synthesized. Subjective test shows super-wideband speech is better speech quality than wideband speech signal.

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Adaptive control of gas metal arc welding process

  • Song, Jae-Bok;Hardt, David-E.
    • 제어로봇시스템학회:학술대회논문집
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    • 1993.10b
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    • pp.191-196
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    • 1993
  • Since the welding process is complex and highly nonlinear, it is very difficult to accurately model the process for real-time control. In this paper, a discrete-time transfer function matrix model for gas metal arc welding process is proposed. Although this linearized model is valid only around the operating point of interest, the adaptation mechanism employed in the control system render this model useful over a wide operating range. A multivariable one-step-ahead adaptive control strategy combined with a recursive least-squares method for on-line parameter estimation is implemented in order to achieve the desired weld bead geometries. Command following and disturbance rejection properties of the adaptive control system for both SISO and MIMO cases are investigated by simulation and experiment.

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An Adaptive Complementary Sliding-mode Control Strategy of Single-phase Voltage Source Inverters

  • Hou, Bo;Liu, Junwei;Dong, Fengbin;Mu, Anle
    • Journal of Electrical Engineering and Technology
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    • v.13 no.1
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    • pp.168-180
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    • 2018
  • In order to achieve the high quality output voltage of single-phase voltage source inverters, in this paper an Adaptive Complementary Sliding Mode Control (ACSMC) is proposed. Firstly, the dynamics model of the single-phase inverter with lumped uncertainty including parameter variations and external disturbances is derived. Then, the conventional Sliding Mode Control (SMC) and Complementary Sliding Mode Control (CSMC) are introduced separately. However, when system parameters vary or external disturbance occurs, the controlling performance such as tracking error, response speed et al. always could not satisfy the requirements based on the SMC and CSMC methods. Consequently, an ACSMC is developed. The ACSMC is composed of a CSMC term, a compensating control term and a filter parameters estimator. The compensating control term is applied to compensate for the system uncertainties, the filter parameters estimator is used for on-line LC parameter estimation by the proposed adaptive law. The adaptive law is derived using the Lyapunov theorem to guarantee the closed-loop stability. In order to decrease the control system cost, an inductor current estimator is developed. Finally, the effectiveness of the proposed controller is validated through Matlab/Simulink and experiments on a prototype single-phase inverter test bed with a TMS320LF28335 DSP. The simulation and experimental results show that compared to the conventional SMC and CSMC, the proposed ACSMC control strategy achieves more excellent performance such as fast transient response, small steady-state error, and low total harmonic distortion no matter under load step change, nonlinear load with inductor parameter variation or external disturbance.