Z源逆变器研究
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摘要
与传统的电压源和电流源逆变器相比,Z源逆变器具有可实现升降压变换以及逆变器桥臂可以直通等优点,在新能源发电领域具有广阔的应用前景。但现有的Z源逆变器拓扑存在Z源电容电压应力大以及启动冲击大等缺陷。
本文研究新型Z源变流器电路结构与电路拓扑设计方法,并在此基础上系统地研究了Z源应用于单相逆变、三相逆变以及AC-AC这三个功率变换场合时的新型电路拓扑、工作原理、工作特性和控制策略。
提出了新型Z源变流器电路结构,给出了Z源变流器电路拓扑设计方法,得到了一系列新型Z源变流器电路拓扑,新型拓扑能够解决现有拓扑所存在的重要缺陷,减小变换器体积、重量和实现成本。
探索了Z源在单相逆变场合的应用。提出了单相Z源逆变器电路拓扑族,包括基本型、简化型和升降压型三种拓扑。基本型与简化型拓扑仅需使用两个功率开关,并且输入输出共地。以简化型拓扑为例进行了分析,研究了其单周期控制策略,并进行了实验验证。升降压型拓扑需使用三个功率开关,存在降压和升压两种工作模式,能实现单级升降压逆变,具有输入电流连续,双向功率流动等优点。
提出了新型三相Z源逆变器拓扑及其软启动策略,能有效解决传统拓扑电路结构上的缺陷,减小变换器的体积、重量,增加可靠性。研究了新型拓扑在各种调制策略下的工作特性,分析了断续工作模式下的工作原理,并推导了进入断续工作模式的条件,给出了参数设计准则,研制了原理样机,给出了实验结果。
建立了新型三相Z源逆变器的小信号模型,得到了系统传递函数,基于根轨迹法分析了各电路参数对系统传递函数中右半平面零点的影响。在分析现有的闭环控制实现复杂,稳定性差的基础上,提出了输入电压前馈加输出电压峰值反馈的控制策略,实现了直流侧与交流侧的解耦控制,具有实现简单、稳定性好以及输出电压无稳态误差等优点,实验结果证实了理论分析的正确性。
最后,对Z源AC-AC变换器进行了研究。提出了一类新型单相与三相Z源AC-AC变换器电路拓扑族及其换流策略,有效解决了现有拓扑导通损耗大以及存在换流问题等缺陷,这类电路拓扑具有结构简单、变换效率和可靠性高、换流实现简单且安全可靠等优点。分析了这类变换器的稳态工作原理、换流工作模态和参数设计准则,并以电压型单相Z源AC-AC变换器为例进行了实验验证。
The Z-source inverter can perform buck-boost conversion and the phase legs can be on shoot-through state, therefore it can be widely used in renewable energy power supply system, but the present Z-source inverter has the drawbacks of high Z-source capacitor voltage stress and huge inrush surge.
The research of this dissertation focus on the new Z-source converter structure and design method of Z-source converter topologies. The new topologies, operation principle, characteristic and control strategy of the single-phase Z-source inverter, three-phase Z-source inverter and Z-source AC-AC converter are investigated systematically.
A new Z-source converter structure is proposed and a series of new Z-source converter topologies are derived based on the topological design method. Compared to existing topologies, the new topologies can achieve less volume, weight and cost. The application of the Z-source network in single-phase inverter is researched. The single-phase Z-source inverter topologies are proposed, including the basic topology, the simplified topology and the buck-boost topology. The basic and simplified topologies only utilize two switches with the input and output sharing the same ground. Analysis is given taking the simplified topology as an example. One-cycle control is adopted and is verified by experimental results. The buck-boost topology utilizes three switches and has two operation modes: buck mode and boost mode. It can perform the single-stage buck-boost conversion with continuous input current and bidirectional power flow.
An improved three-phase Z-source inverter topology and its soft-start strategy are proposed to solve the problems in traditional topology. The system volume and cost can be reduced and the reliability can be improved. The characteristic of improved topology under various SPWM and SVPWM control is investigated. The operation principle under discontinuous conduction mode (DCM) is analyzed and the condition in DCM mode is derived. The parameters design rule is given. A prototype is built on and the experimental results are given.
The small signal model of the new three-phase Z-source inverter is derived and the transfer function of system is given. The effect on right-hand-plane zero caused by different parameters is analyzed based on loot-locus analyses. The present closed loop control strategy of Z-source inverter is complex and not always stable. A new feed-forward of input plus feedback of peak output control strategy is proposed, and the control of DC-link and inverter stage is decoupling. This control strategy is simple and stable, and there is no steady-state error in ac output. The analysis is verified by experimental results.
Finally, the analysis is given on Z-source AC-AC converter. A new family of single phase four switches structure and three phase six switches structure Z-source AC-AC converters are proposed to solve the drawbacks of high conduction loss and commutation problem in present Z-source AC-AC converters. They have the merits such as simple structure, high efficiency, high reliability and safe commutation can be achieved. The operation principle, commutation modes and parameter design method are analyzed. Experimental results on voltage-fed single phase Z-source AC-AC converter are given to verify the analysis.
本文研究新型Z源变流器电路结构与电路拓扑设计方法,并在此基础上系统地研究了Z源应用于单相逆变、三相逆变以及AC-AC这三个功率变换场合时的新型电路拓扑、工作原理、工作特性和控制策略。
提出了新型Z源变流器电路结构,给出了Z源变流器电路拓扑设计方法,得到了一系列新型Z源变流器电路拓扑,新型拓扑能够解决现有拓扑所存在的重要缺陷,减小变换器体积、重量和实现成本。
探索了Z源在单相逆变场合的应用。提出了单相Z源逆变器电路拓扑族,包括基本型、简化型和升降压型三种拓扑。基本型与简化型拓扑仅需使用两个功率开关,并且输入输出共地。以简化型拓扑为例进行了分析,研究了其单周期控制策略,并进行了实验验证。升降压型拓扑需使用三个功率开关,存在降压和升压两种工作模式,能实现单级升降压逆变,具有输入电流连续,双向功率流动等优点。
提出了新型三相Z源逆变器拓扑及其软启动策略,能有效解决传统拓扑电路结构上的缺陷,减小变换器的体积、重量,增加可靠性。研究了新型拓扑在各种调制策略下的工作特性,分析了断续工作模式下的工作原理,并推导了进入断续工作模式的条件,给出了参数设计准则,研制了原理样机,给出了实验结果。
建立了新型三相Z源逆变器的小信号模型,得到了系统传递函数,基于根轨迹法分析了各电路参数对系统传递函数中右半平面零点的影响。在分析现有的闭环控制实现复杂,稳定性差的基础上,提出了输入电压前馈加输出电压峰值反馈的控制策略,实现了直流侧与交流侧的解耦控制,具有实现简单、稳定性好以及输出电压无稳态误差等优点,实验结果证实了理论分析的正确性。
最后,对Z源AC-AC变换器进行了研究。提出了一类新型单相与三相Z源AC-AC变换器电路拓扑族及其换流策略,有效解决了现有拓扑导通损耗大以及存在换流问题等缺陷,这类电路拓扑具有结构简单、变换效率和可靠性高、换流实现简单且安全可靠等优点。分析了这类变换器的稳态工作原理、换流工作模态和参数设计准则,并以电压型单相Z源AC-AC变换器为例进行了实验验证。
The Z-source inverter can perform buck-boost conversion and the phase legs can be on shoot-through state, therefore it can be widely used in renewable energy power supply system, but the present Z-source inverter has the drawbacks of high Z-source capacitor voltage stress and huge inrush surge.
The research of this dissertation focus on the new Z-source converter structure and design method of Z-source converter topologies. The new topologies, operation principle, characteristic and control strategy of the single-phase Z-source inverter, three-phase Z-source inverter and Z-source AC-AC converter are investigated systematically.
A new Z-source converter structure is proposed and a series of new Z-source converter topologies are derived based on the topological design method. Compared to existing topologies, the new topologies can achieve less volume, weight and cost. The application of the Z-source network in single-phase inverter is researched. The single-phase Z-source inverter topologies are proposed, including the basic topology, the simplified topology and the buck-boost topology. The basic and simplified topologies only utilize two switches with the input and output sharing the same ground. Analysis is given taking the simplified topology as an example. One-cycle control is adopted and is verified by experimental results. The buck-boost topology utilizes three switches and has two operation modes: buck mode and boost mode. It can perform the single-stage buck-boost conversion with continuous input current and bidirectional power flow.
An improved three-phase Z-source inverter topology and its soft-start strategy are proposed to solve the problems in traditional topology. The system volume and cost can be reduced and the reliability can be improved. The characteristic of improved topology under various SPWM and SVPWM control is investigated. The operation principle under discontinuous conduction mode (DCM) is analyzed and the condition in DCM mode is derived. The parameters design rule is given. A prototype is built on and the experimental results are given.
The small signal model of the new three-phase Z-source inverter is derived and the transfer function of system is given. The effect on right-hand-plane zero caused by different parameters is analyzed based on loot-locus analyses. The present closed loop control strategy of Z-source inverter is complex and not always stable. A new feed-forward of input plus feedback of peak output control strategy is proposed, and the control of DC-link and inverter stage is decoupling. This control strategy is simple and stable, and there is no steady-state error in ac output. The analysis is verified by experimental results.
Finally, the analysis is given on Z-source AC-AC converter. A new family of single phase four switches structure and three phase six switches structure Z-source AC-AC converters are proposed to solve the drawbacks of high conduction loss and commutation problem in present Z-source AC-AC converters. They have the merits such as simple structure, high efficiency, high reliability and safe commutation can be achieved. The operation principle, commutation modes and parameter design method are analyzed. Experimental results on voltage-fed single phase Z-source AC-AC converter are given to verify the analysis.
引文
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