• Title/Summary/Keyword: Synchronous Control

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Position Synchronous Control of a Two-Axes Driving System by H$\infty$ Approch (H$\infty$ 제어기법을 이용한 2축 구동 시스템의 위치동기제어)

  • Byun, Jung-Hoan;Yeo, Dong-Jun
    • Journal of the Korean Society for Precision Engineering
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    • v.18 no.2
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    • pp.192-198
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    • 2001
  • In this study, a methodology of synchronous control which can be applied to position synchronization of a two-axes driving system has been developed. The synchronous error is caused by model uncertainties and torque disturbance of each axis. To overcome these problems, the proposed synchronous control system has been composed of two speed controllers and one synchronous controller. The speed controllers based on PID control law are aimed at the following to speed reference. And the parameters of speed controllers have been designed in order that speed response of the second axis corresponds with one of first axis. Especially, considering to model uncertainties of each axis, the synchronous controller has been designed using H$\infty$ control theory. The controller eliminates the synchronous error by controlling speed of the second axis. The effectiveness of the proposed method has been verified through simulation.

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Direct Torque Control of a Synchronous Reluctance Motor Using the Finite Element Method

  • Lee Sang-Don
    • KIEE International Transaction on Electrical Machinery and Energy Conversion Systems
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    • v.5B no.2
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    • pp.173-180
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    • 2005
  • The construction of a Synchronous Reluctance Motor (SynRM) is simple and also highly economical because a stator from the existing AC motor can be used. Since the synchronous inductance in the Synchronous Reluctance Motor is an element that is proportional to torque, its exact value must be experimentally or analytically found for accurate control and performance development of the motor. In this paper, direct torque control (DTC) simulation is carried out to maximize the torque of the Synchronous Reluctance Motor and the fast response characteristics with the inductance value by the Finite Element Method (FEM). The response characteristics are compared through the proposed direct torque control and torque response characteristics that are based on the existing PI Control in order to confirm the fast response features. To test the performance of the direct torque controller, the torque response is analyzed with variable speed and load condition.

A Study on the Efficiency Improvement of TTFC(Two Transistor Forward Converter) using Synchronous Rectifier of Compulsory Control-driver (동기정류기 강제구동 방식을 이용한 TTFC의 효율 향상에 관한 연구)

  • Bae, Jin-Yong;Kim, Yong;Lee, Eun-Young;Kwon, Soon-Do;Han, Kyung-Tae;Han, Dae-Hee
    • Proceedings of the KIEE Conference
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    • 2003.10b
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    • pp.166-170
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    • 2003
  • This paper presents the TTFC(Two Transistor Forward Converter) using Synchronous Rectifier of Compulsory Control-driver. The two transistor forward circuit is used to decrease voltage stress of primary side and the synchronous rectifier is used to reduce current stress of secondary side. Previous synchronous rectifier's MOSFET of TTFC have long dead time This paper presents synchronous rectifier of compulsory control-driver for minimized dead time. This paper compared with diode rectifier, self-driven synchronous rectifier and compulsory control-driver synchronous rectifier of TTFC. The principle of operation, feature and design considerations are illustrated and verified through the experiment with a 200W 100kHz MOSFET based experimental circuit.

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Research on the Power Sharing Control and Stability of VSGs

  • Xie, Dong;Zang, Da-Jin;Gao, Peng;Wang, Jun-Jia
    • Journal of Power Electronics
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    • v.17 no.2
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    • pp.542-550
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    • 2017
  • Aiming at the deficiencies of power sharing control performances when a traditional droop control is adopted for microgrid inverters, this paper proposes a microgrid inverter power sharing control strategy based on a virtual synchronous generator. This control method simulates the electromechanical transient characteristics of a synchronous generator in a power system by an ontology algorithm and the control laws of a synchronous generator by control over the speed governor and excitation regulator. As a result, that the microgrid system is able to effectively retain the stability of the voltage and frequency, and the power sharing precision of the microgrid inverter is improved. Based on an analysis of stability of a microgrid system controlled by a virtual synchronous generator, design thoughts are provided for further improvement of the power sharing precision of inverters. The simulation results shows that when the virtual synchronous generator based control strategy was adopted, the power sharing performances of microgrid inverters are improved more obviously than those using the droop control strategy.

A ROBUST CONTROL OF PM SYNCHRONOUS MOTOR USING ACCELERATING TORQUE FEEDBACK

  • Kim, Hyun-Soo;Kim, Myung-Bok;Youn, Myung-Joong;Chung, Se-Kyo
    • Proceedings of the KIPE Conference
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    • 1998.10a
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    • pp.470-475
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    • 1998
  • A robust control technique is presented for a high performance control of a permanent-magnet(PM) synchronous motor. In order to deal with the internal and external disturbances of a PM synchronous motor drive system, a new feedback control structure is proposed. Since the dynamic behavior of the PM synchronous motor drive system is mainly concerned with the difference between the electro-magnetically developed torque and the load torque which generally referred to as an accelerating torque, the estimation and control techniques of this torque are introduced. The simulations and experiments are carried out for the DSP-based PM synchronous motor drive system and the results well demonstrate the effectiveness of the proposed control technique.

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New Instantaneous Torque Estimation and Control for PM Synchronous Motor (영구자석 동기전동기의 새로운 순시토오크 추정 및 제어)

  • 정세교;김현수;윤명중
    • The Transactions of the Korean Institute of Power Electronics
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    • v.3 no.1
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    • pp.23-35
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    • 1998
  • A new instantaneous torque control is presented for a high performance control of a permanent magnet(PM) synchronous motor. In order to deal with the torque pulsating problem of a PM synchronous motor in a low speed region, new torque estimation and cotrol techniques are proposed. The linkage flux of a PM synchronous motor is estimated using a model reference adaptive system technique and the torque is instantaneously controlled by the proposed torque controller combining an integral variable structure control with a space vector PWM. The proposed control provides the advantage of reducing the torque pulsation caused by the non-sinusoidal flux distribution. This control strategy is applied to the high torque PM synchronous motor drive system for direct drive applications and implemented by using a software of the DSP TMS320C30. The simulations and experiments are carried out for this system and the results well demonstrate the effectiveness of proposed control.

Experimental Study on Frequency Support of Variable Speed Wind Turbine Based on Electromagnetic Coupler

  • You, Rui;Chai, Jianyun;Sun, Xudong;Bi, Daqiang;Wu, Xinzhen
    • Journal of Power Electronics
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    • v.18 no.1
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    • pp.195-203
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    • 2018
  • In the variable speed Wind Turbine based on ElectroMagnetic Coupler (WT-EMC), a synchronous generator is coupled directly to the grid. Therefore, like conventional power plants, WT-EMC is able to inherently support grid frequency. However, due to the reduced inertia of the synchronous generator, WT-EMC is expected to be controlled to increase its output power in response to a grid frequency drop to support grid frequency. Similar to the grid frequency support control of Type 3 or Type 4 wind turbine, inertial control and droop control can be used to calculate the WT-EMC additional output power reference according to the synchronous generator speed. In this paper, an experimental platform is built to study the grid frequency support from WT-EMC with inertial control and droop control. Two synchronous generators, driven by two induction motors controlled by two converters, are used to emulate the synchronous generators in conventional power plants and in WT-EMCs respectively. The effectiveness of the grid frequency support from WT-EMC with inertial control and droop control responding to a grid frequency drop is validated by experimental results. The selection of the grid frequency support controller and its gain for WT-EMC is analyzed briefly.

Considerations on the Performance of Current Sensorless Control of a Synchronous Reluctance Motor (동기릴럭턴스전동기의 전류센서리스 제어 성능 고찰)

  • Shin, Myoung-Ho
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.26 no.1
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    • pp.61-65
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    • 2012
  • Some works about the current sensorless control of a synchronous reluctance motor have been presented. However, there is no analysis about the performance and the detuning effect of the current sensorless control. This paper presents the problems and the detuning effect of the current sensorless control of a synchronous reluctance motor by simulation results. In addition, torque limiter is proposed to limit the torque current within the torque limit.

Direct Thrust Control of Permanent Magnet Type Linear Synchronous Motor by using Digital Signal Processor (DSP를 이용한 영구 자석형 선형 동기전동기의 직접 추력 제어)

  • U, Gyeong-Il;Kim, Deok-Jin;Gwon, Byeong-Il
    • The Transactions of the Korean Institute of Electrical Engineers B
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    • v.49 no.8
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    • pp.514-521
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    • 2000
  • This paper presents a direct thrust control scheme for permanent magnet linear synchronous motor(PMLSM) by using digital signal processor(DSP). And a simulation method for the direct thrust control of a permanent magnet linear synchronous motor using the equivalent circuit is presented. The detent force that was obtained by cubic spline method is considered in the simulation. Thrust correction coefficient is utilized to estimate actual thrust on the direct thrust control, which considers the longitudinal end effect due to the finite core length of the permanent magnet linear synchronous motor. The motor self inductance, the initial flux linkage by the permanent magnet is calculated in advance by the finite element analysis, and then the direct control simulation is carried out. As the results, thrust, current and speed are shwon.

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Position-Synchronous Control of a Rotating System by Adding Disturbance Observer to Coupling Structure (커플링구조와 외란관측기를 결합한 회전시스템의 위치동기제어)

  • 변정환
    • Journal of the Korean Society for Precision Engineering
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    • v.20 no.3
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    • pp.66-73
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    • 2003
  • In this study, a methodology of synchronous control which can be applied to position synchronization of a two-axis rotating system is developed. Based on coupling structure, the synchronous control system is composed of disturbance observer, speed and synchronous controllers. The speed controller is designed to follows speed reference. The disturbance observer is designed to restrain synchronous error. In addition, the synchronous controller is designed for a viewpoint of accurate synchronization in lead compensation law. The effectiveness of the proposed method is verified through simulation.