Sinusoidal Output Inverter Using Rotating Coordinate Transformation.

A new three‐input/output characteristic‐varying filter in the D‐module for direct processing of three‐phase signals

“…Considering the fact that low-order filtering is often employed for separation of positive and negative phase components [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15], Fig. 6 shows them in detail in the case where filter F(s) is selected as a first-order low-pass filter such as…”

“…Yano's idea was extended to the parallel processing of two components by the same two filters in parallel form by Takada and his colleagues in 1988 in relation to active filtering and its applications [4]. Potential usefulness of the filter with phase converters/vector rotators has been demonstrated through several other applications of three-phase power systems such as control of sinusoidal inverter expected to produce sinusoidal power independently on loads by Okamura, Nakano, and Nabae [5][6][7]11], realization of a series active capacitance capable of compensating voltage drop caused by source impedances by Nabae and colleagues [8], and compensation of current in nonsinusoidal unbalanced three-phase systems by Tanaka and colleagues [9]. Order of the employed interior parallel filters was first in almost all previous applications, second on rare occasion.…”

Characteristic‐varying systems in the D‐Module: Their properties of existence, realization, and stability

“…A typical structure for the two-input/output filters with polarity selectivity is such that two of the same parallel arranged single-input/output filters are accompanied by vector rotators in the front and back [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19]. The filter is hereafter referred to as the filter with vector rotators.…”

“…In 1988, the filter with vector rotators was applied to threephase power systems with active filtering function by Takada and his colleagues at Mitsubishi Electric, where the interior filter is a single filter, and is not a set of two filters in parallel form [3][4][5]. In 1993, Okamura, Nakano, and Nabae applied the filter with vector rotators to control and analysis of sinusoidal-voltage-output inverter, where the interior parallel filters were first-order high-pass filters [6][7][8][9]. Subsequently, applications of the filter with vector rotators to other three-phase power systems have been reported by Nabae, Tanaka, and colleagues [10,11].…”