Modulated model predictive rotor current control (M2PC) of a DFIG driven by an indirect matrix converter with fixed switching frequency

This paper proposes a vector modulation-based model predictive current control strategy for a two-stage matrix converter. The switching frequency is kept constant by fixing the switching instantly. The control scheme controls the source reactive power on the input side and output currents on the output side. Besides, the advantage of the proposed strategy compared with conventional model predictive control is firstly proved using the principle of vector synthesis and the law of sines in the vector distribution area. Moreover, to ensure zero-current switching operations and reduce the switching losses, an optimal switching sequence is proposed and implemented. Furthermore, considering that the input filter resonance is easier to be inspired by the model predictive control, compared with conventional linear control strategies, an innovative active damping technique is proposed to suppress the input filter resonance. To assess the performance of the proposed method, simulation and experimental results are demonstrated, showing that the control system features both good steady-state and transient performance.

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Direct Power Control of Matrix Converter-Fed DFIG with Fixed Switching Frequency

Sustainability ◽

10.3390/su11092604 ◽

2019 ◽

Vol 11 (9) ◽

pp. 2604 ◽

Cited By ~ 4

Author(s):

Arzhang Yousefi-Talouki ◽

Shaghayegh Zalzar ◽

Edris Pouresmaeil

Keyword(s):

Power Control ◽

Direct Torque Control ◽

Matrix Converter ◽

Torque Control ◽

Switching Frequency ◽

Direct Power ◽

Direct Power Control ◽

Reactive Component ◽

Extensive Discussion ◽

Induction Generators

In this paper, a direct power control (DPC) technique is proposed for matrix converter-fed grid-connected doubly fed induction generators (DFIGs). In contrast to what has been investigated in the past for direct torque control (DTC) or DPC of matrix converter-fed DFIGs, the active and reactive powers are regulated in a fixed switching frequency using indirect space vector modulation (ISVM) technique. Hence, designing input filters for matrix converters (MCs) becomes convenient. In addition, the reactive component of input side of MC is controlled which leads to reduction of distortion in grid current waveform. Also, an extensive discussion is addressed for nonlinear voltage errors of MC that may cause inaccurate power control. Simulation results done in MATLAB/Simulink show the effectiveness of the proposed method.

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Switching Regulation in the Control of 5-Phase Permanent Magnet Synchronous Motor Fed by 3×5 Direct Matrix Converter

European Journal of Electrical Engineering ◽

10.18280/ejee.230104 ◽

2021 ◽

Vol 23 (1) ◽

pp. 27-35

Author(s):

Muhammad Ishaq ◽

Yanbo Che ◽

Kifayat Ullah

Keyword(s):

Permanent Magnet ◽

Predictive Control ◽

Permanent Magnet Synchronous Motor ◽

Synchronous Motor ◽

Matrix Converter ◽

Control Technique ◽

Frequency Regulation ◽

Frequency Variation ◽

Switching Frequency ◽

Output Current

Matrix converter is an AC-AC direct power converter comprising of an array of bi-directional switches. It does not require an intermediate DC-link and allows sinusoidal output waveforms with varying amplitudes and frequencies. The configuration of these bi-directional switches decides the number of inputs and outputs of the matrix converter. This research uses a direct matrix converter (DMC) as a phase-changing device that can convert a three-phase AC voltage into a 5-phase AC voltage. The DMC is modulated with the model predictive control algorithm. The output of DMC is fed to a five-phase permanent magnet synchronous motor (PMSM). The model predictive current control technique for DMC is carried out by developing a mathematical model of an input filter and PM motor used as a load. The predictive control of DMC results in sinusoidal output current, and it also enables the frequency variation in the output current. This frequency variation is useful in controlling the speed of the motor connected to the load. After controlling the 5-phase motor, the switching frequency regulation is done to observe its effect on the motor's stator current waveforms. Switching frequency regulation helps to limit the unnecessary switching of DMC. We developed a MATLAB-based Simulink model to study PMSM, and detailed results are presented. The results show that switching regulation can significantly reduce the switching frequency without compromising the current waveform quality.

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Analysis of Fast-Scale Bifurcation in Peak Current Controlled Buck-Boost Inverter Based on Unified Averaged Model

International Journal of Bifurcation and Chaos ◽

10.1142/s0218127416500747 ◽

2016 ◽

Vol 26 (05) ◽

pp. 1650074 ◽

Cited By ~ 11

Author(s):

Hao Zhang ◽

Shuai Dong ◽

Weimin Guan ◽

Ye Liu

Keyword(s):

High Frequency ◽

Low Frequency ◽

Period Doubling ◽

Current Control ◽

High Frequency Oscillation ◽

Switching Frequency ◽

Unified Framework ◽

Frequency Oscillation ◽

Peak Current ◽

Averaged Model

In this paper, a unified averaged modeling method is proposed to investigate the fast-scale period-doubling bifurcation of a full-bridge integrated buck-boost inverter with peak current control. In order to increase the resolution of the conventional classic averaged model to half the switching frequency, sample-and-hold effect of inductor current is absorbed into the averaged model, i.e. the proposed unified averaged model can capture the high-frequency dynamical characteristics of the buck-boost inverter, which is both an extension and a modification of conventional averaged model. Based on the unified mode, fast-scale bifurcation is identified, and the corresponding bifurcation point is predicted with the help of the locus movement of all the poles, and their underlying mechanisms are revealed. Detailed analysis shows that the occurrence of high-frequency oscillation means fast-scale bifurcation, while the occurrence of low-frequency oscillation leads to slow-scale bifurcation. Finally, it is demonstrated that the unified averaged model can provide not only a general method to investigate both the slow- and fast-scale bifurcations in a unified framework but also a quite straightforward design-oriented method which can be directly applicable.

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