摘要
针对传统统一电能质量调节器开关器件多、结构复杂的缺点,提出采用九开关变换器替换背靠背式变换器作为电路拓扑。九开关变换器开关器件少,在造价、体积及散热等方面具有一定优势。首先介绍九开关变换器的原理与调制策略,结合电网电压跌落时电路的稳态分析,揭示了电压补偿端口与电流补偿端口输出电压的变化规律,据此得出九开关变换器可通过在两输出端口间动态分配直流电压以有效降低系统所需直流电压幅值的结论;其次简要说明了基于新拓扑调节器的控制算法;最后通过仿真与实验,验证了所提方案的可行性。
For dealing with the shortcomings of the unified power quality conditioner including considerable amount of power electronic devices and its complex structure, the paper proposes to replace the back-to-back double PWM converter with the nine-switch converter as the main circuit topology. Nine-switch converter has some advantages such as less switching devices, lower cost, smaller volume and etc. Firstly, the paper introduces the principle and modulation strategy of the nine-switch converter. Secondly, it analyzes steady-state circuit in the case of the voltage sag compensation and reveals the relationship between terminal voltage of the voltage and current compensation ports. According to the above analysis results, the occupancy ratio of the DC voltage can be dynamically allocated between the two output ports to effectively reduce the DC voltage requirement of the system. Then it gives a brief description of the control algorithms of the proposed topology. Finally, the paper verifies the feasibility of the proposed alternatives through simulation and experiment.
出处
《电工技术学报》
EI
CSCD
北大核心
2015年第S2期128-134,共7页
Transactions of China Electrotechnical Society
基金
国家自然科学基金(51507039)
中央高校基本科研业务费专项资金(HIT.NSRIF.2017013)
中国博士后科学基金(2016M591529)资助项目
关键词
九开关变换器
统一电能质量调节器
电压跌落补偿
无功补偿
谐波抑制
Nine-switch converter
unified power quality conditioner
voltage sag compensation
reactive power compensation
harmonic suppression
