Four Quadrant Operation of a
Converters
The
bi-directional boost converter is the IPQC version of the conventional
thyristor dual converters. Their topology is derived from ac-ac matrix
converters using four quadrant switches (4QSWs). Since no four-quadrant switch
is currently commercially available the realized by embedding a transistor
inside a diode bridge or by inverse parallel connections of transistors as
shown in Fig (1). Power IGBT employed because they have the advantage so high
switching frequency and small pulse and notch widths. Topology of a
single-phase bi-directional boost converter using typeI 4QSWs is shown in
Fig(2).
In the
circuit shown in Fig (2), here are four4QSWs, two in each limb. Each 4QSW
comprises two 2QSWs (two quadrant switches), each two-quadrant switch
consisting of a IGBTT with series diode, connected in inverse-parallel. The
operation of the bi -directional boost converter in boost mode and in a
particular quadrant in the V-I plane shown in Fig (3) is determined by the
conditioning of the switching states of two sets (IandII) of devices. In the
single-phase version each set comprises four IGBTs; set(A) IGBTs–T11,T22,T33,T44
and set(B)I GBTTs-T1,T2,T3,T4. corresponding to the four quadrants in the buck
and boost modes pertaining to the rectification and inversion operations
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