【作者】 陈强；

【导师】 谢少军；

【作者基本信息】 南京航空航天大学 ， 电气工程， 2019， 硕士

【摘要】 400Hz中频电源在航空、船舶等领域具有广泛的应用,本文研究基于三电平半桥逆变拓扑的单相400Hz逆变模块电路及基于单相模块直接组合构成三相逆变器的控制技术,以实现高效率、可直接简单组合、输出电能质量优良及带不对称负载能力强的模块化组合三相逆变器。首先介绍了3L-NPC半桥逆变拓扑和T-NPC半桥逆变拓扑的工作原理,建立了基于功率场效应管的三电平逆变器损耗分析模型,对两种拓扑的功率器件损耗进行了对比分析,具体分析了两种拓扑功率器件损耗差异产生的原因,并研究了不同开关频率下两种拓扑的总损耗,明确了开关频率对拓扑选择的影响,为功率电路拓扑和开关频率的选取提供了理论依据。研究了逆变模块的滤波器结构优化,采用无源阻尼和开关频率次谐波陷阱,以减小滤波器体积;为实现单相模块的高质量稳态和动态输出电压,研究了基于输出电压有效值外环、瞬时值输出电压环和瞬时值电感电流环的逆变器控制技术及各环节调节器的设计方法。研究了基于单相逆变模块实现三相直接组合运行的方法,为了解决采用分散控制法实现单相逆变模块组合运行时的输出电压对称性问题,提出了一种三相输出电压相位闭环控制方案,以保证在各种不对称负载情况下组合三相逆变器的输出电压对称性。在理论研究和分析的基础上,设计了3.3kVA单相T-NPC逆变模块及由三个单相模块构成的组合式逆变电源实验样机,分别进行了逆变模块单机运行、组合三相运行的实验研究。实验结果验证了本文设计的单相逆变模块具备优良的稳态和动态性能,并且可以无需外加组合控制器而直接简单组合为三相逆变器,且组合逆变器具有很强的带不对称负载能力,在不对称负载情况下输出电压对称性好。研制的基于3.3kVA模块的10kVA组合式三相400Hz逆变器样机输出特性符合有关标准的要求。更多还原

【Abstract】 400Hz inverters are widely used in aviation,ship and other fields.In order to achieve the modular three-phase inverters with high efficiency,simple connection,high output voltage quality and strong ability for imbalance loads,the single-phase 400 Hz inverter module based on three-level half-bridge inverter topology and the control technologies for simply combining three modules to a three-phase inverter are studied.Firstly,the principles of 3L-NPC half-bridge inverter and T-NPC half-bridge inverter are introduced.The loss analysis model for NPC inverters based on MOSFETs is established.The losses of power devices between the two topologies have been analyzed and compared.The influence of the switching frequency on the losses is clarified,which provides a theoretical basis for selecting the power circuit and switching frequency.The filter structure optimization of the inverter module has been studied.The passive damping and subharmonic traps are used to reduce the filter volume.To achieve high quality output at the steady state and dynamic state,the control technologies and the design procedure of the regulators of the inverter based on the output voltage RMS outer loop,instantaneous output voltage loop and instantaneous inductor current loop are analyzed.The method of combining three modules to a three-phase inverter based on single-phase inverter module is studied.In order to solve the problem of symmetry of output voltage when combining three modules to a three-phase inverter with the method of decentralised control,a phase closed loop control scheme of three-phase output voltage has been proposed.With this scheme,the output voltage symmetry of the combined three-phase inverter is ensured under various imbalance load conditions.A 3.3kVA single-phase T-NPC inverter module and a combined inverter prototype consisting of three single-phase modules are developped based on the theoretical analysis.The experimental results verify that the single-phase inverter module designed in this paper has excellent steady state and dynamic performance,and the three-phase inverter can be directly combined by three single-phase inverters without the need of an external combination controller,and the combined inverter has a strong ability for imbalance loads.The output voltage symmetry is satisfying under imbalance load conditions.The output characteristics of the 10 kVA combined three-phase 400 Hz inverter prototype based on three 3.3kVA modules are in line with the relevant standards.更多还原