Unity Power Factor Operation of Indirect Matrix Converter Tied to Unbalanced Grid

Abstract

Abstract-This paper presents a new control method for Indirect Matrix Converter operating under unbalanced grid voltages. The proposed method aims to achieve balanced output voltages as well as a near unity input power factor operation. First, an opportune reference current accurately generated, and a proportional integral resonant controller are designed in a dq reference frame that is synchronized with the positive sequence of the grid voltages so as to achieve a perfect tracking of input reactive power reference. Then, a real-time estimator of the virtual dc-link voltage is developed with the aim to provide balanced output voltages; therefore an almost constant active power free of low frequency ripple is supplied from the grid. Experimental results are presented to verify the feasibility and effectiveness of the proposed control method.

A Hybrid Modulation Scheme for Dual-Output Five-Leg Indirect Matrix Converter

“…3 shows that two values of the virtual dc-link voltage are provided over a switching period. Indeed, the voltage V dc is equal to E ab during the application of the first switching state [1][2][3][4][5][6][7][8][9][10]. It becomes equal to -E ca during the application of the second switching state .…”

“…This topology has some favorable characteristics compared to the direct matrix converter such as a simpler commutation scheme and a more compact clamping circuit. It also offers the possibility of reducing the power switches number in case of unidirectional power flow application [6].…”

“…Considering (20.b), one can also deduce: is the initial phase-angle of grid voltage negative sequence [6]. One can observe that an additional ripple term with frequency equal to twice of the grid appears in the expression of 〈 〉.…”

Improvement of the input performance of a three‐phase‐single‐phase matrix converter based on space vector modulation

“…Due to above advantages, the matrix converter has gained considerable attention from researchers . At present, research on matrix converters mainly focuses on three‐phase‐three‐phase matrix converters (3‐3MCs), including new topologies, control strategies, overmodulation methods, common mode voltage suppression, and fault tolerance . In recent years, the application of matrix converters has been studied from variable frequency speed regulation to distributed power transmission, wind power generation, and other fields in academia and industry.…”

“…1,2 At present, research on matrix converters mainly focuses on three-phase-three-phase matrix converters , including new topologies, [3][4][5][6][7] control strategies, [8][9][10] overmodulation methods, 11,12 common mode voltage suppression, [13][14][15] and fault tolerance. [16][17][18] In recent years, the application of matrix converters has been studied from variable frequency speed regulation 19,20 to distributed power transmission, 21 wind power generation, 22 and other fields in academia and industry. Results from these studies show that matrix converters have good industrial application prospects.…”