Space Vector Pulsewidth Modulation Strategy for ANPC-5L Inverter Based on Model Predictive Control

Abstract

SVPWM strategies for active neutral-point-clamped five-level (ANPC-5L) inverters have multiple control degrees of freedom and control objectives. However, traditional SVPWM strategies are hard to realize optimal control of multiple objectives due to the objectives are coupled with each other. To address this problem, an SVPWM strategy based on model predictive control (MPC) is proposed. In the pulse generation process of the proposed SVPWM, all control degrees of freedom are utilized to achieve optimal control of multiple objectives through MPC. Firstly, voltage vector sequences that meet the requirements of CMV are selected. Then, a cost function is constructed to realize optimal control of the neutral point potential (NPP) and three floating capacitors (FCs) voltage. The proposed strategy has advantages such as high control accuracy and producing low CMV. Finally, the effectiveness of the proposed strategy is validated by a 150kW three-phase ANPC-5L inverter prototype.