Improved Reference Generation of Active and Reactive Power for Matrix Converter With Model Predictive Control Under Input Disturbances

Abstract

The existing model predictive control schemes for the matrix converter perform well under ideal input conditions, but are not optimal when source voltages are unbalanced and distorted. The analysis shows that, under input disturbances, the input filter capacitors cause active power fluctuation and further output power quality degradation, which has been ignored in literature. Therefore, a method is proposed to extract the fluctuation with a digital filter and compensate it in the reference generation of source active power, so as to eliminate the output low-frequency harmonics. In the case of input voltage unbalance, a method is proposed to generate the reference source reactive power which could achieve sinusoidal source currents, without the need of separating sequence components. Moreover, effects of source voltage distortions, which degrade the input power quality significantly and are ignored in literature, are suppressed with the proposed generation method of reference reactive power. The extensive experimental results in nine cases have verified the satisfactory steady-state and dynamic performance of the proposed methods. INDEX TERMS Model predictive control, matrix converter, source voltage disturbances, current distortions.

Direct Modulation for Conventional Matrix Converters Using Analytical Signals and Barycentric Coordinates

“…No doubt, based on recent research progress, the v ok can be generated using collections of PWM duty cycles calculated by various algorithms, which are widely reported in the literature as a direct Venturini based methods, space vector approach [17], [18] or carrier-based modulation methods [1]- [3], [19]- [25]. A quite interesting approach to the AC-AC voltage synthesis represents the Model Predictive Control (MPC) with a finite control set and space vector modulation (SVM), which are the most common control methods for the CMC3 × 3 [23], [26], [27]. However, the possible range of PWM duty cycle values for m × n topology, is rarely discussed and analyzed in papers, moreover the general formula of direct AC-AC synthesis for any set of input voltages is not fully developed and demonstrated.…”

“…Fully independent control of the input power factor, in a matrix converter, is not available because of the fundamental relation between the input and output voltages (27) and currents (37). Nevertheless, when the matrix converter does not operate with its own maximum transfer ratio (it means the maximum length of the reference output voltage trajectory inside the synthesis field), an input angle can be set to achieve a desired input power factor.…”

Modulation and Control of a DC-AC Converter With High-Frequency Link Transformer for Grid-Connected Applications

“…However, these solutions are complex in implementation, and therefore the related research work on the modulation and control techniques of this topology for the grid-connected applications, especially those used to integrate RES and BES systems, still needs improvements. Moreover, different control schemes are introduced to control the ac-dc converters operations and improve the active and reactive power flow are presented in [29]- [31].…”

Source current quality improvement of finite control set model predictive control‐based matrix converter under distorted source voltage conditions

“…In a matrix converter, output current control performs better than the source current control in terms of current quality, total harmonic distortion (THD), and unity power factor (UPF). 11 Some studies have been carried out to improve source current and minimize the input reactive power in References 12-16 Reference 16 proposes two methods that are reference source current generation method and instantaneous unity power factor (IUPF) strategy. It is stated that the reference source current generation method is used more extensively in subsequent studies as it gives better results than IUPF strategy.…”