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中文摘要：
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。
英文摘要：
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 invert- ers 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 topoi- ogy is derived.Then the proper output LC filter is designed to eliminate high-order modulation harmonics according to the system of harmonies and total harmonic distortion（THD） requirement.Multiple resonant controllers is adopted to co- mpensate the low order harmonies, 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.
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