摘要
为了研究应用于中高压领域的有源电力滤波器(APF),建立了3级H桥级联APF数学模型,采用载波相移调制技术将装置的等效开关频率提高6倍,基于瞬时无功功率理论提取谐波及无功电流,采用三角载波比较法跟踪指令电流,直流侧电压采用分层控制来实现稳压和均压。仿真结果表明,H桥级联APF能够快速精确地检测出谐波及无功电流,在器件开关频率1.05 k Hz下补偿谐波及无功电流,将电网相电流THD由27.66%降至1.24%,同时维持直流侧电压的稳定和均衡,使电压误差率不超过2%。系统能在1个电网周期内响应负载的动态变化,从而验证了方案的可行性。
In order to research the active power filter （ APF mathematical model is established. The equivalent APF） applied to high voltage field, 3 H-bridges cascaded switching frequency of the device is increased by 6 times u- sing carrier phase shift modulation technique. Harmonic and reactive current is extracted based on instantaneous re- active power theory. Command current is tracked by triangular carrier comparison method. DC side voltage is stable and balanced using hierarchical control. The simulation results show that H-bridge cascaded APF can detect the harmonic and reactive current quickly and accurately. Harmonic and reactive current is compensated with 1.05 kHz device switching frequency and the grid phase current THD is dropped from 27.66% to 1.24%. DC side voltage is stable and balanced and voltage error rate less than 2% . The device can respond to load dynamic changes in a grid cycle. So the program feasibility is verified.
出处
《电子测量与仪器学报》
CSCD
北大核心
2015年第6期844-852,共9页
Journal of Electronic Measurement and Instrumentation
基金
国家863高技术基金项目(2011AA05A107)
广东省引进创新科研团队计划资助(2011N015)
关键词
H桥级联型
有源电力滤波器
载波相移调制
谐波检测
三角载波比较
电压分层控制
H-bridge cascaded
active power filter
carrier phase shift modulation
harmonic detection
triangularcarrier comparison
voltage hierarchical control
