Regulating and Equalizing dc Capacitance Voltages in Multilevel STATCOM
Date
1997
Journal Title
Journal ISSN
Volume Title
Publisher
IEEE Transactions on Power Delivery
Abstract
Because of the high MVA ratings, it would be expensive to provide independent, equal, regulated DC voltage sources to power the multilevel converters which are proposed for STATCOMs. DC voltage sources can be derived from the DC link capacitances which are charged by the rectified AC power. This paper addresses two control issues: (1) regulation of the DC capacitance voltages and (2) their equalization. Equalization is necessary (i) to ensure the even sharing of voltage stresses in the gate-turn-off thyristors (GTOs), and (ii) to prevent the degradation of total harmonic distortion (THD) factors, as all harmonic elimination strategies depend on equal voltages in their assumptions. The strategies considered are: (a) the fundamental frequency method, and (b) the sinusoidal pulse width modulation method. Digital simulations are used to confirm the feasibility of the control methods
Description
Full text available at http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=584411&newsearch=true&queryText=Regulating%20and%20Equalizing%20dc%20Capacitance%20Voltages%20in%20Multilevel%20STATCOM
Keywords
PWM invertors, capacitance, harmonic distortion, power capacitors, power convertors, power systems, static VAr compensators t, hyristor convertors, voltage control
Citation
Chen, Y., Mwinyiwiwa, B., Wolanski, Z. and Ooi, B.T., 1997. Regulating and equalizing DC capacitance voltages in multilevel STATCOM. Power Delivery, IEEE Transactions on, 12(2), pp.901-907.