400Hz逆变电源波形控制及限流技术研究

发布时间：2018-10-30 09:26

【摘要】：中频逆变器作为交流电源的重要组成部分,在航空、机车和船舶领域中得到了广泛的应用,本文以10kVA、400Hz/115V组合式三相四线制中频逆变器为研究对象,主要研究了逆变器的双环控制技术以及限流保护技术。首先,介绍了带输出隔离变压器的控制对象的数学模型,对比了几种双环控制方案的优缺点,最后选择带负载电流前馈的电容电压外环电感电流内环的双环控制策略,在考虑数字控制延时影响的基础上,在连续域中设计了双环控制参数,为了方便限流点的设置,内环采用PR(比例谐振)控制器,外环除了基波PR控制器外,为了抑制输出电压谐波,还在外环加入了3、5、7等低次谐波谐振控制器,仿真和实验表明所设计的双环控制参数具有可行性。其次,为了提高逆变装置的可靠性和短路性能,提出了变参数限流控制策略,该方案在双环控制基础上,以短路时电感电流指令正弦化为目的,以减小外环PR控制器参数为手段,以双环控制中的内环为控制对象,在三相短路、两相短路和单相短路故障发生时,能够有效改善输出特性,使输出电流谐波大大减小,也削弱了输出隔离变压器在短路时的噪声,仿真和实验结果表明该方案具有很好的限流效果。最后,对本文的参数设计过程和限流控制策略进行优缺点总结,并对下一步工作进行展望。
[Abstract]:As an important part of AC power supply, if inverter has been widely used in the fields of aviation, locomotive and ship. In this paper, 10kVA 400Hz / 115V combined three-phase four-wire inverter is taken as the research object. This paper mainly studies the double loop control technology and current limiting protection technology of inverter. Firstly, the mathematical model of the control object with output isolation transformer is introduced, and the advantages and disadvantages of several double loop control schemes are compared. Finally, the double loop control strategy of capacitive voltage outer loop inductor current inner loop with load current feedforward is selected. On the basis of considering the influence of digital control delay, the double loop control parameters are designed in the continuous domain. In order to facilitate the setting of the limiting point, the inner loop adopts PR (proportional resonance) controller, and the outer loop is except the fundamental PR controller. In order to suppress the output voltage harmonics, a low order harmonic resonance controller, such as 3 / 5 / 7, is added to the outer ring. The simulation and experiments show that the designed double loop control parameters are feasible. Secondly, in order to improve the reliability and short-circuit performance of the inverter, a variable parameter current limiting control strategy is proposed. By reducing the parameters of the outer loop PR controller and taking the inner loop of the double loop control as the control object, the output characteristics can be improved effectively and the output current harmonics can be greatly reduced when the three phase short circuit, two phase short circuit and single phase short circuit fault occur. The noise of the output isolation transformer during short circuit is also weakened. The simulation and experimental results show that the proposed scheme has a good current limiting effect. Finally, the advantages and disadvantages of the parameter design process and current limiting control strategy are summarized, and the future work is prospected.
【学位授予单位】：华中科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TM464

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