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In this paper, a new type of STATCOM is proposed. This new STATCOM is constructed by cascading several identical full bridge (H bridge) voltage source inverters (VSI). A so called phase-shifted SPWM unipolar voltage switching scheme is applied to control the switching devices of each VSI. The harmonics in STATCOM current caused by the DC voltage ripple are rejected by a new method developed in this paper. As a result, the size of inductor and DC capacitors can be further reduced. A very effective startup procedure is proposed to start up the STATCOM. The proposed STATCOM has the advantages of a reduced number of VSIs; the VSIs being identical and extremely fast in response to reactive power change.
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Liang et al. (2002) studied this question.
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