摘要
针对高压有源电力滤波器,为了采用级联结构时在相同的级联数目下可以获得更多的电平数,同时提高输出功率等级,并且考虑到开关频率和系统补偿特性关系,采用一种混合级联多电平拓扑结构。该有源电力滤波器由可以等效为电压源与电流源的两部分串联组成,电流源部分为传统的PWM变换器;电压源部分由3个H桥逆变器级联构成,其输出电压的基波分量可以抵消电网电压,因此电流源部分的PWM变换器交流侧承受的电压很低,有功损耗小,从而可以提高PWM变换器的开关频率,从而谐波抑制的效果更好。其控制策略简单,易于实现。作为高压大容量有源电力滤波器预研,在单相电网电压有效值220V条件下,通过MATLAB仿真和实验结果证明了该拓扑的有效性和实用性。
Aiming at high-voltage active power filter, in order to improve output power and get more levels with the same number of cascaded H bridges when the system adopts cascade structure , and also the relationship of switc-hing frequency and compensation characteristic is taken into consideration , a topology of hybrid cascaded multilevel is adopted.This active power filter consists of two parts that can be equivalent to voltage source and current source, respectively.They are connected in series, the current source is constituted by PWM converter;the voltage source is constituted by hybrid cascaded H bridge converter.The fundamental component of its output voltage counteracts grid voltage, so the current source can work in the environment of low voltage .It has low active power loss, and the switching frequency is higher, the compensation characteristic is better.The control strategy is simple and easy to implement.As the pre-research of high-voltage active power filter, MATLAB simulation and the experiment results in the condition of single-phase grid which the virtual value is 220V show the availability and practicability of the topology.
出处
《电子测量与仪器学报》
CSCD
北大核心
2015年第3期408-414,共7页
Journal of Electronic Measurement and Instrumentation
基金
国家自然科学基金(51177037)资助项目
关键词
混合级联
多电平
电压源
电流源
有源电力滤波器
hybrid cascaded
multilevel
voltage source
current source
active power filter
