Voltage control of the SVM-modulated STATCOM using the average model

Reference signals are generally generated for various applications in current waveforms, including active and reactive power control, voltage regulation and unbalance compensation. Current modulators (e.g. hysteresis method) are dynamically fast and simple to implement. However, variable high switching frequencies result in lower efficiency compared to other modulators. In the mean time, if references are available in voltage waveforms, then higher efficiencies are achievable through much lower fixed switching frequencies. This paper initially uses the average model of STATCOM, coupling it with the space vector modulation (SVM). Then, a control method is suggested in order to derive the converter three-phase reference voltages using the complemented average model. The proposed control algorithm was simulated with MATLAB that provides high efficiency outcomes. Simulations are also compared with those of another method to confirm the performance of the suggested control system.