【作者】 金鑫；

【导师】 郭育华；

【作者基本信息】 西南交通大学 ， 电力电子与电力传动， 2004， 硕士

【摘要】 本文针对中频逆变电源的主电路，控制策略以及抗变压器直流偏磁等问题进行了研究。着重于对逆变电源控制策略的研究，从控制策略的角度入手改善逆变电源的输出动态性能，提高逆变电源的稳态精度，同时改善输出电压的正弦度，减少输出电压的谐波含量。 文章从分析电压微分多闭环控制策略的理论基础入手，通过大量的仿真比较验证了该控制策略在改善逆变电源动态和稳态性能以及抑制输出电压谐波方面良好的性能。 对逆变电源输出滤波器进行了详细的研究。采用一种分离式的滤波器设计方式，即先根据使逆变电源稳定工作LC滤波器的条件确定滤波器的参数，再根据分离式谐振阻尼LC滤波器的思想重新修正滤波器的结构和参数。仿真证明该滤波器既具有负载变化时电源稳定的优点，又有分离式谐振阻尼LC输出滤波器对振荡的良好的抑制作用，具有较高的输出电压波形质量。 文章针对逆变电源变压器的设计，控制系统的软硬件设计以及其他附属电路的设计进行了详细的研究，并以5kW、400Hz中频逆变电源为例进行了具体的设计。控制系统采用了美国TI公司专们为基于控制而设计的TMS320F240控制芯片。 针对逆变变压器中存在的直流偏磁问题，提出了一种数字PI电压积分抗偏磁的控制方式。通过检测变压器原边电压在几个周期内的变化量，利用PI调节器得出的控制量来适时的调整触发脉冲的宽度，把变压器直流偏磁限制在较小的范围之内。更多还原

【Abstract】 In this dissertation, a strong emphasis is paid on the study of maincircuit, control strategy, resisting fulx imbalance in the inverter transformer and so on. At the begin of the dissertation, control strategy is analysed for improving performances of the interver in dynamic, steady-state and minishing harmonious component of the output voltage.Firstly, the theory of the voltage differential multiloop feedback strategy is analysed . Then a lot of simulation and comparision reaserch validate the excellent performances of the interver in dynamic, steady-state and minishing harmonious component of the output voltage.A particular study is paid on the deferent filter of the inverter.A segregative filter is adopted. Firstly, work out the filter parameter on the condition that ensures the stability.of the filter.Then modify the configuration and parameter on the idea of the controllability damp resonance. Simulations validate the good qualities in ensuring the stability.of the inverter when load is changed and minishing harmonious component of the output voltage.In the dissertation, particulatr designs are made on transformer, software and hardware of controlling system and other accessorial circuits.A 5kW, 400Hz interver is designed as a practical illustration. TMS320F240 is adopted in controlling system.F240 is designed by TI crop, for the control.A digital PI voltage integral fulx imbalance control is proposed for eliminating fulx imbalance in the interver transformer. By measuring the change of primary voltage of the transformer in several periods, PI controller adjusts the width of pulse so that flux imbalance of the transformer is limited in a reasonable scope.更多还原