Abstract
The space vector modulation (SVM) method using only rotating vectors is very effective to suppress the common-mode voltage (CMV) for matrix converters (MCs). However, the effect of the input filter on the input power factor (IPF) has not been fully investigated when using this method. This study investigated the effect of the input filter on the displacement angle and proposes an IPF compensation strategy for the zero CMV-SVM method in MCs. The proposed strategy analyzes the duty cycles of rotating vectors under the IPF-compensation condition. Through this analysis, the proposed strategy adjusts the zero vector by using a set of three counterclockwise-rotating vectors or three clockwise-rotating vectors to make all the duty cycles non-negative, ensuring that the zero CMV-SVM method can be applied to compensate the IPF for the MCs. This study also determines the condition to achieve unity IPF for the main power source and the maximum allowable IPF if the above condition is not met. Finally, experimental results are provided to validate the theoretical study.
Highlights
In recent years, matrix converters (MCs) with bidirectional power flow capabilities have received considerable attention
The present paper proposes a strategy as follows: i) When d4 > 0, the selected vectors and their duty cycles are the same as those in the conventional case. ii) When d4 < 0, to ensure that the duty cycle d4 of the rotating vector r4 is non-negative, the zero vector should be implemented by a set of three clockwise-rotating vectors, i.e., 0 = (r2 +r4 +r6)/3
The proposed strategy investigated the displacement angle caused by the input filter and its effect on the value of duty cycles upon compensation
Summary
Matrix converters (MCs) with bidirectional power flow capabilities have received considerable attention. Nguyen et al.: IPF Compensation Strategy for Zero CMV-SVM Method in MCs reduce the peak value and the RMS of the CM by using all valid switching states, including rotating-vector states [14]. Space vectors of MC input and output currents Duty cycles of zero and active vectors, n ∈ {0, 1, 2, 3, 4} Voltage transfer ratio of MC, q = Vo/Vi Compensated angle, δi = vi − ii Output voltage phase angle referred to the bisecting line of the corresponding sector. With the limits of αo and βi in (11) and (12), it is possible to prove that all duty cycles—dI , dII , dIII , dIV , and dV —in (23)–(27) are non-negative All of these duty cycles must be less than 1, so the VTR in the conventional zero CMV-SVM method is limited as follows: q≤. The following strategy will attempt to compensate the angle δf in (35) as much as possible to achieve the maximum IPF of the power source
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