宽输入直流电压下中频逆变器双环控制研究

发布时间：2017-12-31 22:26

本文关键词：宽输入直流电压下中频逆变器双环控制研究　出处：《华中科技大学》2015年硕士论文　论文类型：学位论文

【摘要】：400Hz中频逆变电源以其重量轻和体积小的优势,被作为船舰和航空等领域中重要的供电电源而大量应用。这就要求逆变电源的输出不但要具备良好的稳态特性和动态特性,而且要具备短路保护及恢复能力,以确保其安全运行和可靠供电。本文以一台2kVA的400Hz/230V电压型单相中频逆变器作为对象,对中频逆变器的电压电流双闭环数字控制技术进行探讨和研究。本文首先建立了单相全桥SPWM逆变器的数学模型,并为对模型中的等效电阻参数r进行了修正,给出了一种简单有效的实验测量方法,使得仿真系统与实际的控制系统高度吻合。另外,结合技术要求,文中给出了主电路LC滤波器参数的设计方法,并考虑具体的动态性能要求,对原参数进行了修正。然后,详细分析了单极倍频SPWM调制方式下的死区效应,为谐波补偿控制器的设计提供了理论依据。其次,针对数字控制延时对400Hz系统的严重影响而不能忽略的情况,给出了考虑数字控制延时的电感电流作为内环的双闭环控制的设计方法。在传统的双闭环控制基础上,本文引入了输出电压前馈和负载电流前馈控制,并提出一种多重比例谐振(PR)控制策略,保证系统输出良好的稳态波形质量和动态响应速度、较小的电压超调。而且内环采用PR控制器使得内环的跟踪性能也较好,可以实现短路限流保护,提高系统的安全性。对于宽输入直流电压范围下的电压波动对控制系统设计的影响,文中进行了等效简化设计,主要利用MATLAB辅助工具来设计控制器参数,避免了繁杂的理论分析,使设计过程简单化,而且设计结果有效可行。最后,对本文所提出的方案进行了仿真和实验验证,仿真和实验的结果非常一致,使逆变器输出的稳态电压波形质量和动态性能良好,并且具备短路限流功能。然后,对全文内容进行了总结,并对未来工作做出展望。
[Abstract]:400Hz medium frequency inverter with its light weight and small size advantage, is widely used as an important power supply ships and aerospace and other fields. This requires that the output of the inverter power supply not only have good steady-state and dynamic characteristics, but also with short circuit protection and recovery capabilities, to ensure its safe operation and the reliable power supply. Based on the 400Hz/230V voltage single-phase medium frequency inverter with a 2kVA as the object, the voltage and current of inverter dual loop digital control technology are discussed and studied. This paper established a mathematical model of the single-phase full bridge SPWM inverter, and the equivalent resistance parameters of R model are modified, are given a simple and effective experimental method, control system of the simulation system and the actual height of the match. In addition, combined with the technical requirements, are given in this paper. The main circuit of LC filter parameters The design method, and considering the specific requirements of dynamic performance, the parameters are modified. Then, the dead time effect of unipolar SPWM modulation mode is analyzed in detail, and provides a theoretical basis for the design of harmonic compensation controller. Secondly, according to the digital control delay serious influence on 400Hz system and can not be ignored, given the digital control delay inductance current as the design method of double closed loop control loop. On the basis of the traditional double closed loop control, this paper introduces the output voltage feedforward and load current feedforward control, and proposes a multi proportional resonant (PR) control strategy, to ensure the system output waveform quality good steady-state and dynamic response speed and the smaller the voltage overshoot and loop using PR controller makes the tracking loop performance is good, can realize the short-circuit current limiting protection, to improve the security of the system. Wide input DC voltage range of the voltage fluctuation on the control effect of the system design, this paper simplifies the design of equivalent, the main use of MATLAB tools to design the controller parameters, to avoid the analysis of complexity theory, which simplifies the design process, and the design result is effective and feasible. Finally, the simulation and experimental verification scheme in this paper, very consistent with the results of simulation and experiment, the steady state voltage waveform quality and the dynamic performance of the inverter output is good, and have short circuit current limiting function. Then, the paper summarizes the contents, and looks forward to the future work.

【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

【相似文献】