分布式新能源单相两级式逆变器低频纹波抑制  

Low Frequency Ripple Suppression of Distributed New Energy Single-phase Two-stage Inverter

作　　者：吴松泽 张晨 蔡若珺 WU Song-ze;ZHANG Chen;CAI Ruo-jun(Haikou Power Supply Bureau of Hainan Power Grid Co.,Ltd.,Haikou 570100,China)

机构地区：[1]海南电网有限责任公司海口供电局,海南海口570100

出　　处：《电力电子技术》2024年第8期57-60,共4页Power Electronics

基　　金：中国南方电网科技项目(32601590235)。

摘　　要：应用于分布式新能源的两级式直交单相逆变器输入电流中,含有两倍于逆变器输出频率的低频分量,这些低频分量幅值相对其平均值的比例很高,可达到30%以上,严重时将会影响直流电源系统的稳定性,也会大大影响输入电压源的蓄电池、燃料电池的使用寿命。此处通过研究该电流低频分量产生的原因,对前级直直变换器提出一种新的控制策略,即在传统的控制策略中引入谐振控制器,可以有效地抑制直直变换器输出滤波电感电流的低频脉动,进而可以有效抑制变换器低压侧输入电源电流低频脉动分量。此处给出了谐振控制器设计方法及引入谐振控制器后系统各环路的传递函数,分析了满足系统稳定性要求的设计准则。最后通过仿真和实验验证了该新颖的控制策略对于抑制两级式直交逆变器输入电流低频脉动的有效性。The input current of the two-stage DC/AC single-phase inverter applied in the distributed new energy con-tains low frequency ripple which is twice the inverter's output frequency.The proportion of the low frequency current ripple's amplitude to the average current is very high and it could be achieved more than 30%.The stability of DC power system and the longevity of the input voltage source such as battery or fuel cell could be influenced in seri-ously.A new control strategy for the previous stage DC/DC converter is proposed by analyzing the reason of the low frequency current ripple,and the resonant controller is introduced in the traditional control strategy.It can effectively suppress the low frequency ripple of the output filtering inductor current of the DC/DC converter,and suppress the low frequency ripple component of the input power supply current on the low-voltage side of the converter.The design method of the resonant controller and the transfer function of the system circuit are given,the design principles of system stability are also analyzed.At last,the effectiveness of proposed new control strategy to suppress the input cur-rent low frequency ripple which exists in the two-stage DC/AC inverter is verified by simulation and experiments.

关 键 词：逆变器 低频 谐振控制器 

分 类 号：TM464[电气工程—电器]