• Title, Summary, Keyword: Predictive Control

Search Result 949, Processing Time 0.045 seconds

The DC-link Voltage Balancing of the Three-Level T-type Inverter Using the Predictive Control (예측제어를 이용한 T-형 3-레벨 인버터의 중성점 전압제어)

  • Kim, Tae-Hun;Lee, Woo-Cheol
    • The Transactions of The Korean Institute of Electrical Engineers
    • /
    • v.65 no.2
    • /
    • pp.311-318
    • /
    • 2016
  • This paper is a study on the neutral point voltage balancing of the three-phase 3-level T-type inverter using the predictive control techniques. Recently, multi-level inverter has been attracting attention as the advantages such as efficiency improving and harmonic reduction. Especially, the T-type inverter topology is advantageous in low DC-link voltage. However, in case of the prediction control, it takes a lot of time, because there exist 27 voltage vectors and it has to be calculated according to the respective voltage vectors. Therefore, in this paper, we propose a method to implement predictive control techniques while reducing the operation time. In order to reduce the operation time, the predictive control is implemented by using the minimum voltage vector except for the unnecessary voltage vector. The result of the implemented predictive control is added to the SPWM by using the offset voltage. It was verified through simulation and experimental results.

Application Study of the Predictive Pulse Control for Floor Heating System (바닥난방을 위한 부하 예측식 펄스제어 방식의 적용성 연구)

  • Cho, Sung-Hwan;Kim, Seong-Su;Kim, Yong-Bong;Na, Hee-Hyeong
    • Proceedings of the SAREK Conference
    • /
    • /
    • pp.167-175
    • /
    • 2007
  • A predictive pulse control strategy as a means of improving the energy efficiency of radiant floor heating systems is explored. Experiments at the apartment with floor heating system are conducted to assess and compare the energy performance of the predictive pulse control strategy with an existing conventional control strategy. The Results showed that new suggested PPCM( Predictive Pulse Control Method) was available to decrease the gap of $1{\sim}1.5^{\circ}C$ between maximum and minimum indoor temperature of each rooms. Therefore PPCM method was favor to radiant floor heating system which have a delay time of 10-20 minutes for heat transfer by floor layers.

  • PDF

Predictive Current Control of 12-Pulse Parallel Connected Dual Converter System (12펄스 병렬 연결 듀얼 컨버터 시스템의 예측전류제어)

  • 이창원;송인호;최창호
    • Proceedings of the KIPE Conference
    • /
    • /
    • pp.405-408
    • /
    • 1998
  • In this paper, a predictive current control of 12-pulse parallel connected dual converter system with interphase transfromer(IPT) is presented. Firstly, 12-pulse parallel connected dual converter system and the predictive current control of this system is discussed. And the validity of the presented system and the excellence of the predictive current control response is proved through the simyulation and experiment result.

  • PDF

A Model Predictive Control Method to Reduce Common-Mode Voltage for Voltage Source Inverters

  • Vu, Huu-Cong;Lee, Hong-Hee
    • Proceedings of the KIPE Conference
    • /
    • /
    • pp.209-210
    • /
    • 2015
  • This paper presents a new model predictive control method without the effect of a weighting factor in order to reduce common-mode voltage (CMV) for a three-phase voltage source inverter (VSI). By utilizing two active states with same dwell time during a sampling period instead of one state used in conventional method, the proposed method can reduce the CMV of VSI without the weighting factor. Simulation is carried out to verify the effectiveness of the proposed predictive control method with the aid of PSIM software.

  • PDF

PI Control with the Smith Predictive Controller for a Variable Speed Refrigeration System

  • Hua, Li;Choi, Jeong-Pil;Jeong, Seok-Kwon;Yang, Joo-Ho;Kim, Dong-Gyu
    • International Journal of Air-Conditioning and Refrigeration
    • /
    • v.15 no.3
    • /
    • pp.129-136
    • /
    • 2007
  • In this paper, we suggest PI control with the Smith predictive controller to improve transient response of a variable speed refrigeration system (VSRS). As the refrigeration system has long dead time inherently, it is difficult to get fast responses of super-heat and reference temperature. We incorporated the Smith predictive controller into PI to compensate the effect of the long dead time of the system. At first, we introduced the decoupling model of the system to control capacity and superheat simultaneously and independently. Next, we designed the predictive controller of the superheat based on PI control law. Finally, the control performance by the proposed method was investigated through some numerical simulations and experiments. The results of the simulations and experiments showed that the proposed PI control with the predictive controller could obtain acceptable transient behaviour for the system.

A Fuzzy Predictive Sliding Mode Control for High Performance Induction Motor Position Drives

  • Bayoumi E.H.E.;Nashed M.N.F.
    • Journal of Power Electronics
    • /
    • v.5 no.1
    • /
    • pp.20-28
    • /
    • 2005
  • This paper presents a fuzzy predictive sliding mode control for high performance induction motor position drives. A new simplified inner-loop sliding-mode current control scheme based on a nonlinear mathematical model of an induction motor is introduced. Novel predictive fuzzy logic PI and PID controllers are used in speed and position loops, respectively. Sliding-mode current controllers and fuzzy predictive logic controllers are designed based on indirect vector control. The overall system performance is examined under different dynamic operating conditions. The performance of the drive system is robust and stable, and insensitive to parameters and operating condition variations even though non-exact system parameters are used in the implementation of the proposed controllers.

Robust Predictive Speed Control for SPMSM Drives Based on Extended State Observers

  • Xu, Yanping;Hou, Yongle;Li, Zehui
    • Journal of Power Electronics
    • /
    • v.19 no.2
    • /
    • pp.497-508
    • /
    • 2019
  • The predictive speed control (PSC) strategy can realize the simultaneous control of speed and current by using one cost function. As a model-based control method, the performance of the PSC is vulnerable to model mismatches such as load torque disturbances and parameter uncertainties. To solve this problem, this paper presents a robust predictive speed control (RPSC) strategy for surface-mounted permanent magnet synchronous motor (SPMSM) drives. The proposed RPSC uses extended state observers (ESOs) to estimate the lumped disturbances caused by load torque changes and parameter mismatches. The observer-based prediction model is then compensated by using the estimated disturbances. The introduction of ESOs can achieve robustness against predictive model uncertainties. In addition, a modified cost function is designed to further suppress load torque disturbances. The performance of the proposed RPSC scheme has been corroborated by experimental results under the condition of load torque changes and parameter mismatches.

A Novel Discrete-Time Predictive Current Control for PMSM

  • Sun, Jung-Won;Suh, Jin-Ho;Lee, Young-Jin;Lee, Kwon-Soon
    • 제어로봇시스템학회:학술대회논문집
    • /
    • /
    • pp.1915-1919
    • /
    • 2004
  • In this paper, we propose a new discrete-time predictive current controller for a PMSM(Permanent Magnet Synchronous Motor). The main objectives of the current controllers are to ensure that the measured stator currents tract the command values accurately and to shorten the transient interval as much as possible, in order to obtain high-performance of ac drive system. The conventional predictive current controller is hard to implement in full digital current controller since a finite calculation time causes a delay between the current sensing time and the time that it takes to apply the voltage to motor. A new control strategy in this paper is seen the scheme that gets the fast adaptation of transient current change, the fast transient response tracking and is proposed simplified calculation. Moreover, the validity of the proposed method is demonstrated by numerical simulations and the simulation results will be verified the improvements of predictive controller and accuracy of the current controller.

  • PDF

The PID Controller for Predictive control Algorithm (예측제어기법을 이용한 PID 제어기 설계)

  • Kim Yang-Hwan;Lee Jung-Jae;Lee Jung-Yong;Lee Jang-Myung
    • Journal of Institute of Control, Robotics and Systems
    • /
    • v.11 no.1
    • /
    • pp.19-26
    • /
    • 2005
  • This paper is concerned with the design of a predictive PID controller which has similar features to the model-based predictive controller. A PID type control structure is defined, which includes prediction of the outputs and the recalculation of new set points using the future set point data. The optimal values of the PID gains are precalculated using the values of gains calculated from an unconstrained generalized predictive control algorithm. Simulation studies demonstrate the performance of the proposed controller and the results are compared with the conventional PID and fuzzy control algorithms.

Model predictive control combined with iterative learning control for nonlinear batch processes

  • Lee, Kwang-Soon;Kim, Won-Cheol;Lee, Jay H.
    • 제어로봇시스템학회:학술대회논문집
    • /
    • /
    • pp.299-302
    • /
    • 1996
  • A control algorithm is proposed for nonlinear multi-input multi-output(MIMO) batch processes by combining quadratic iterative learning control(Q-ILC) with model predictive control(MPC). Both controls are designed based on output feedback and Kalman filter is incorporated for state estimation. Novelty of the proposed algorithm lies in the facts that, unlike feedback-only control, unknown sustained disturbances which are repeated over batches can be completely rejected and asymptotically perfect tracking is possible for zero random disturbance case even with uncertain process model.

  • PDF