基于叠加原理的八开关三相逆变器全调制度范围内两种等效PWM算法

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Abstract At first,the comparison study on two space vector pulse width modulation (SVPWM) algorithms for eight-switch three-phase inverter(ESTPI) in the full modulation region based on different basic voltage vectors are carried out.In order to enhance the utilization ratio of the DC-link voltage of ESTPI,a SVPWM algorithm based on the superposition principle in the over-modulation region is proposed.Based on that,a SVPWM algorithm for ESTPI in the full modulation region is obtained.This algorithm divides the operation region of ESTPI into linear region,over-modulation mode I region,and over-modulation mode II region depending on the modulation index.Then,based on PWM regular sampling method,the modulating functions of the equivalent carrier-based pulse width modulation (CBPWM) algorithm of this SVPWM algorithm in the full modulation region are derived.The change rules of the equivalent carrier-based modulating functions are summarized with the modulation index changing afterwards.The simulation and experimental results show that the amplitude of fundamental line voltage is proportional to the modulation index and it can be increased maximumly by about 10.2%,by adopting these two PWM algorithms.

Key words： Post-fault reconfigured topology eight-switch three-phase inverter space vector pulse width modulation carrier-based pulse width modulation over-modulation superposition principle modulating function

Received: 02 December 2014 Published: 08 September 2015

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TM464

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	Liu Yongchao
	Ge Xinglai
	Feng Xiaoyun

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Liu Yongchao,Ge Xinglai,Feng Xiaoyun. Two Types of Equivalent PWM Algorithms in the Full Modulation Region for Eight-switch Three-phase Inverter Based on the Superposition Principle[J]. Transactions of China Electrotechnical Society, 2015, 30(15): 96-108.

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https://dgjsxb.ces-transaction.com/EN/ OR https://dgjsxb.ces-transaction.com/EN/Y2015/V30/I15/96

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