Single-phase PWM converters array for three-phase reactive power compensation. II. Frequency domain studies

This paper presents a three-phase STATCOM structure based on the use of three single-phase PWM converters. Each single-phase PWM converter is represented by a Thevenin equivalent obtained from analytical expressions based on the operation of the PWM converter. The model is suitable for harmonic propagation studies of large, unbalanced network. The proposed STATCOM structure was used with a particular application to reactive power compensation and phase balancing, where fundamental frequency and harmonics are included in the analysis. The generic model is implemented in the frequency domain using INTAR libraries and proved through time domain simulations via PSCAD/EMTDC. INTAR is a industry grade software for three-phase power flow analysis and harmonic propagation for large networks.