A novel neutral point voltage control strategy of three-level NPC converter and its single switch cycle control region analysis

作者：Li Ning; Wang Yue^*; Jiang Ying Wei; Wang Zhao An

来源：Electric Machines and Control, 2015, 19(1): 35-44.

DOI：10.15938/j.emc.2015.01.006

• Control region
• SPWM
• SVPWM
• Three-level
• Voltage balance

A novel neutral point (NP) voltage control strategy of three-level neutral point clamped (NPC) converter was proposed to eliminate the NP voltage fluctuation under any modulation strategy. The novel NP voltage control strategy was based on the control target of output line voltage, and real-time correction of output switching states were given according to the NP voltage fluctuation. It is suitable for any modulation strategy as it only deals with the output switching states of any modulation strategy. In order to analyze the control effect of the proposed strategy, the single switch cycle control region was taken as the measurement standard and analysis of fully control region was conducted respectively when using the two most commonly used modulation strategy, sinusoidal pulse width modulation (SPWM) strategy and space vector pulse width modulation (SVPWM). The theoretical analysis and simulation results show that the novel NP voltage control strategy has the advantages of wide application and easy implementation. Whereas, the fully control region of the new strategy is affected by modulation strategy, modulation index and power factor.

• 出版日期2015