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A Simplified Pulse Width Modulation Algorithm for Model Prediction of Cascade Static Synchronous Compensator

Received: 10 December 2018 Accepted: 3 February 2019 To ensure the DC-side voltage stability of cascade static synchronous compensator (STATCOM) units, this paper proposes a pulse width modulation (PWM) algorithm based on virtual flux (VF) for model prediction. Firstly, a VF model was established, which predicts the ideal voltage vector under zero VF error, calculates the DC-side voltage per unit and rounds it to the ideal voltage, and determines the module state by balancing the DC-side voltage between the unit modules. Secondly, the author explained the flow of PWM algorithm based on VFtracking, and analyzed the waveform features. Finally, the proposed PWM algorithm was applied to the STATCOM of cascade multi-level converter. The results of simulation, field experiment and analysis show that the VF-based PWM algorithm for the model prediction of cascade STATCOM can achieve good modulation effect and strike a balance of DC-side voltage between the unit modules. Thus, the proposed PWM algorithm is both rational and feasible.