Development of adaptive hysteresis band current control strategy of PWM inverter with constant switching frequency

2002 ◽  
Author(s):  
Tae-Won Chun ◽  
Meong-Kyu Choi
Keyword(s):  
Control Strategy ◽  
Current Control ◽  
Switching Frequency ◽  
Pwm Inverter

Field oriented predictive control strategy for induction machine drives

2017 ◽  
Vol 37 (1) ◽  
pp. 103-113 ◽  
Author(s):  
Xin Qi ◽  
Lin Wu ◽  
Xiaomin Zhou ◽  
Xianghua Ma
Keyword(s):  
Predictive Control ◽  
Control Strategy ◽  
Induction Machine ◽  
Sampling Frequency ◽  
Current Control ◽  
Switching Frequency ◽  
Frequency Noise ◽  
Boundary Circle ◽  
Content Type ◽  
Simulation Step

Purpose This study aims to drive the induction machine system with a low switching frequency. Design/methodology/approach An unconventional inverter control strategy – field-oriented predictive control (FOPC) – is presented. The strategy limits current distortion by setting a boundary circle. The voltage vector, which could keep current trajectories in boundary, is selected to obtain a low switching frequency. Findings A dual simulation step technique is developed to investigate the influence of sampling frequency on current distortion control and switching frequency. Current control distortion can be improved, i.e. reduced, by increasing the sampling frequency; however, the switching frequency will also increase. Such a law is discovered by the dual simulation step technique and finally verified by experiments. Originality/value A new predictive control method, FOPC, is derived from the rotor filed coordinate machine model and presented in this paper. FOPC circumvents derivative calculations, and thus avoids high-frequency noise amplification.

scholarly journals Predictive-Fixed Switching Current Control Strategy Applied to Six-Phase Induction Machine

Energies ◽  
2019 ◽  
Vol 12 (12) ◽  
pp. 2294 ◽  
Author(s):  
Osvaldo Gonzalez ◽  
Magno Ayala ◽  
Jesus Doval-Gandoy ◽  
Jorge Rodas ◽  
Raul Gregor ◽  
...  
Keyword(s):  
Predictive Control ◽  
Control Strategy ◽  
Control Strategies ◽  
High Harmonic ◽  
Induction Machine ◽  
Experimental Tests ◽  
Sampling Period ◽  
Current Control ◽  
Switching Frequency ◽  
Multiphase Motor

In applications such as multiphase motor drives, classical predictive control strategies are characterized by a variable switching frequency which adds high harmonic content and ripple in the stator currents. This paper proposes a model predictive current control adding a modulation stage based on a switching pattern with the aim of generating a fixed switching frequency. Hence, the proposed controller takes into account the prediction of the two adjacent active vectors and null vector in the ( α - β ) frame defined by space vector modulation in order to reduce the (x-y) currents according to a defined cost function at each sampling period. Both simulation and experimental tests for a six-phase induction motor drive are provided and compared to the classical predictive control to validate the feasibility of the proposed control strategy.

Research on Decoupling Control Strategy for Interior Permanent Magnet Synchronous Motor in Flux-Weakening Region

2012 ◽  
Vol 546-547 ◽  
pp. 313-319
Author(s):  
Liang Liang Mao ◽  
Xu Dong Wang ◽  
Mei Lan Zhou ◽  
Yan Ming Zhang ◽  
Jin Fa Liu
Keyword(s):  
Permanent Magnet ◽  
Control Strategy ◽  
High Speed ◽  
Permanent Magnet Synchronous Motor ◽  
Synchronous Motor ◽  
Current Control ◽  
Pwm Inverter ◽  
Current Vector ◽  
Interior Permanent Magnet ◽  
Flux Weakening

Interior permanent magnet synchronous motors can be applied to applications requiring wide-speed operation by means of flux-weakening control. While due to the fixed capacity of PWM inverter, the high speed operation range of interior permanent magnet synchronous motor (IPMSM) is mainly limited by the saturation of current regulator. In constant power region, in stead of the available voltage that controls the armature current vector, the current vector sometimes becomes uncontrollable in transient operations because of the current regulator saturation. In order to extend its operation range, the current vector control algorithm of IPM motor over the base speed operation is proposed in this paper which includes the decoupling current control and the voltage command compensation. Also this paper introduces a judgment method to monitor if the current regulator has gone into saturation or not. Finally on the basis of simulation results, the effectiveness of this control strategy is further confirmed by real drive tests.

scholarly journals Circulating Current Suppression Strategy of Modular Multilevel Converter Based on Model Predictive Control

2021 ◽  
Vol 261 ◽  
pp. 01035
Author(s):  
kang Liu ◽  
Guige Gao
Keyword(s):  
Model Predictive Control ◽  
Predictive Control ◽  
Control Strategy ◽  
Control Method ◽  
Current Control ◽  
Switching Frequency ◽  
Modular Multilevel Converter ◽  
Multilevel Converter ◽  
Modulation Wave ◽  
Circulating Current

Modular Multilevel Converter (MMC) has the characteristics of high voltage level and low switching frequency. The traditional modular multilevel converter circulating current control strategy mostly adopts the PI control principle, and the parameter setting is complicated and the accuracy is not high, and the control process is more difficult. Model predictive control strategy is the optimal control method based on the model in the existing time domain. This paper proposes a Model Predictive Control (MPC) method based on carrier phase-shifted pulse width modulation (PSC-PWM) to suppress the circulating current, and output the optimal modulation wave through model prediction. Compared with the traditional control strategy, this strategy is simple to implement, does not require complex tuning calculations, and combines with the traditional capacitor voltage equalization strategy to obtain the output modulation wave. A 7-level MMC simulation control system is built in MATLAB / SIMLINK to verify the theory, comparing with existing control methods, it can be concluded that the proposed method has high calculation efficiency, good control accuracy and strong robustness.

A new fuzzy-based current control strategy with fixed switching frequency for improving D-STATCOM performance

2018 ◽  
Vol 35 (3) ◽  
pp. 3285-3294 ◽  
Author(s):  
M. Amirrezai ◽  
H. Rezaie ◽  
G.B. Gharehpetian ◽  
H. Rastegar
Keyword(s):  
Control Strategy ◽  
Current Control ◽  
Switching Frequency
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