摘要
传统同向载波层叠(in-phase disposition,IPD)调制法在应用于CHB型多电平逆变器时虽具有优秀的消谐性能,但存在级联单元功率不均衡问题。为了解决功率均衡问题,并兼顾线电压的消谐性能,在IPD法的基础上深入分析了载波自由度控制原理,进而利用控制载波自由度以重新分配级联单元输出电压的思想,提出一种新型功率均衡调制方法。该方法在IPD法的载波基础上控制载波在不同载波层进行新的周期轮换,可于一个较短的载波轮换周期内实现级联单元的功率均衡,既保留了IPD法的线电压消谐性能,又在实现各级联单元功率均衡的前提下,减少了功率均衡所需时间。最后通过仿真和实验验证了理论分析的正确性和所提方法的可行性。
Although the traditional in-phase disposition(IPD)modulation method has excellent harmonic elimination performance when applied to CHB multilevel inverters,it has the problem of unbalanced power of cascaded units.In order to solve the power balance problem and take into account the harmonic elimination performance of the line voltage,based on the IPD method,the principle of carrier freedom control is deeply analyzed,and then the idea of controlling the carrier freedom to redistribute the output voltage of the cascade unit is proposed,and a new power balance modulation method is put forward.Based on the carrier of the IPD method,the method controls the carrier to perform a new cycle rotation at different carrier layers,which can realize the power balance of the cascaded unit within a shorter carrier rotation cycle,and retains the line voltage harmonic elimination performance of the IPD method.And on the premise of realizing the power balance of all levels of connected units,the time required for power balance is reduced.Finally,the correctness of the theory and the feasibility of the proposed method are verified by the simulation and experiments.
作者
顾军
宋飞
李平
张维国
张明
杜治斌
GU Jun;SONG Fei;LI Ping;ZHANG Weiguo;ZHANG Ming;DU Zhibin(School of Electrical and Information Engineering,Auhui University of Science and Technology,Huainan 232001,China)
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2022年第10期4017-4026,共10页
High Voltage Engineering
基金
国家自然科学基金(51607003)。
关键词
多电平逆变器
功率均衡
自由度
均衡时间
谐波性能
multilevel inverter
power balance
freedom degree
balance time
harmonic performance
