大容量中频逆变器的非线性与不平衡补偿技术
Compensation Technology for Nonlinear and Unbalance Loads in High Power Medium Frequency Inverters
刘春喜 1任庆吉 1陈鹏荣 1杨玉岗1
作者信息
- 1. 辽宁工程技术大学,电气与控制工程学院,辽宁葫芦岛125105
- 折叠
摘要
为补偿大容量中频逆变器的非线性和不平衡,分析了多种三相四线制逆变拓扑、级联式逆变拓扑和组合式多电平逆变拓扑,然后选取3个单相二重逆变器组合式拓扑结构作为逆变器主电路,该电路不仅可得到较高的等效开关频率,且带不平衡负载能力强.通过推导得到逆变器正弦脉宽调制(SPWM)波的表达式,根据系统各次谐波含量及总谐波畸变率(THD)要求可设计合适的滤波器参数;采用多重谐振控制器补偿低次谐波,并在控制器设计中考虑了数字控制延时的影响,采用二阶Pade近似对延时进行等效.设计的系统不仅可有效抑制低次谐波,且具有快速的动态响应性能.最后,通过实验对理论分析进行验证,实验结果与理论分析一致.
Abstract
In order to effectively compensate nonlinearity and unbalance in high power medium frequency inverter,a variety of multilevel inverter topology are analyzed,and the conbined topology of three single-phase dual-pulse inverters is chosen as the main circuit topology,which can get high equivalent switching frequency and strongly unbalanced load.The mathematical expression for sinusoidal pulse width modulation(SPWM) waveform based on the choosed topoiogy is derived.Then the proper output LC falter is designed to eliminate high-order modulation harmonics according to the system of harmonics and total harmonic distortion(THD) requirement.Multiple resonant controllers is adopted to compensate the low order harmonics,and the effect of digital control delay is accounted in the design of controller by using two order Pade approximation to instead of control delay.The designed system can effectively suppress low order harmonic,also has fast dynamic response.Simulation and experimental results are coincident with theoretical analysis.
关键词
逆变器/非线性/数字控制/谐波Key words
inverter/nonlinearity/digital control/harmonic引用本文复制引用
基金项目
国家自然科学基金(50607020)
国家自然科学基金(51177067)
辽宁省教育厅科学研究一般项目(L2012109)
出版年
2014
NETL
NSTL
维普
万方数据