逆变电源的分析与优化设计

本文从逆变电源的原理开始,重点分析了逆变电源的线路设计过程,并以较好的设计思路提高逆变电源的效率。     

高频串联谐振逆变器频率跟踪控制电路的仿真与应用

为了解决高频逆变电源负载参数变化引起固有谐振频率变化,导致逆变器效率降低及开关器件应力增加的问题,提出了一种以集成高速锁相环74HC4046为核心的、应用于功率MOSFET为主开关器件的高频串联谐振逆变电源的无相差频率跟踪控制系统,对电源的输出频率进行实时控制,并用Pspiee进行了仿真分析。结果证明,该系统具有较好的应用前景和推广价值。     

逆变电源干扰信号获取技术研究

为了正确设计逆变电源EMI滤波器,必须首先确定逆变电源传导干扰的性质,确定各种干扰信号的量值.研究了传导干扰测量原理,分析了传导干扰测量的有效方法.     

应用SPWM调制PI控制的逆变电源综合实验

太阳能在生活中运用越来越广泛,为了加深学生对太阳能转换为交流电原理的理解,设计了SPWM调制PI控制的单相逆变电源综合实验课程。详细介绍了单相逆变电源拓扑结构、驱动电路的搭建、LC滤波参数计算与选择,通过采样输出电压计算有效值,进而采用PI闭环控制,观察输出波形,确定PI调节系数,实现恒压输出。实验测试结果表明该设计满足逆变电源的基本要求,实现了逆变电源PI控制,使得输出电压波形更稳定、平滑。该综合实验加深了学生对所学知识的理解,培养了学生发现问题和解决问题的能力。     

基于DSP的数字锁相环的设计

研究了锁相环的原理、建模和参数设计,分析了传统锁相环电路对无互联线逆变电源的鉴相误差影响,利用数字锁相的概念设计了一种基于DSP的全数字化软件的锁相环。通过仿真实验证实,采用数字锁相环能够快速平稳地实现逆变电源并联的相位和频率的跟踪,能实现无互联线逆变电源的并联,同时保持了相位、频率和幅值基本达到一致。     

稀土永磁中频发电机逆变电源设计与性能分析

介绍稀土永磁中频发电机逆变电源系统的设计，分析样机实测的电压波形和性能数据，并与同功率其他励磁方式的工频发电机的性能数据比较，阐述稀土永磁中频发电机的逆变电源的特点，     

抗强电磁干扰可直接启停电机逆变电源的研制

由于中频无源电焊机机内发电机不能发出50Hz的工频交流电,所以在野外施工中不能利用焊机内的发电机给现场的检测仪器和泥浆泵等设备供电.如果给中频无源焊机配备50Hz工频逆变电源,将会使该设备具有更高的使用性和性能价格比.本文研制了中频无源焊机内置2KW工频逆变电源,并且很好的解决了抗干扰问题,提高了工频逆变电源工作的稳定性.     

超声波逆变电源的设计

主要介绍一种超声波逆变电源装置的主电路与保护电路的设计,并给出实验结果。     

模糊算法在埋弧焊逆变电源中的应用

设计给出了埋弧焊逆变电源控制系统及过程控制系统的框图,阐述了埋弧焊电源控制原理,并给出了原理图。确定了模糊控制算法应用于逆变电源,并给出了详细算法步骤、表格和软件流程。实验数据表明,系统稳定可靠,具有实用价值。     

超声波逆变电源的设计

主要介绍一种超声波逆变电源装置的主电路与保护电路的设计,并给出实验结果。     

高效率电流型并网逆变器拓扑及脉冲宽度调制控制策略

A novel topology of the current-source grid-connected inverter is proposed based on the immittance converter theory. A control strategy of sine-sine pulse width modulation （PWM） is studied. Compared with the traditional current-source inverter, the power frequency inductors and power frequency transformer are replaced with high frequency inductors and a high frequency transformer. Thus, the proposed inverter has advantages of small volume, low cost, low total harmonic distortion （THD）, low power losses, high power factor （PF） and simple control. Furthermore, grid voltage cannot influence output current of the grid-connected inverter and the current-source inverter with a high PF that approaches one has been realized. Finally, validity of the theory analysis and feasibility of the control scheme are shown by simulation and experimental results.     

Applications of cascade multilevel inverters

INTRODUCTIONRecently,flexiblealternatingcurrenttrans missionsystems (FACTS) ,custompower,andpowerqualityhavebeenhottopicsbecauseoftheincreasingpowerdemand ,thewidespreaduseofnon linearelectronicequipment,andthehigherpowerqualityrequirementsofsensitiveload…     

Applications of cascade multilevel inverters

Cascade multilevel inverters have been developed for electric utility applications. A cascade M-level inverter consists of (M-1)/2 H-bridges in which each bridge's dc voltage is supported by its own dc capacitor. The new inverter can: (1) generate almost sinusoidal waveform voltage while only switching one time per fundamental cycle; (2) dispense with multi-pulse inverters' transformers used in conventional utility interfaces and static var compensators; (3) enables direct parallel or series transformer-less connection to medium- and high-voltage power systems. In short, the cascade inverter is much more efficient and suitable for utility applications than traditional multi-pulse and pulse width modulation (PWM) inverters. The authors have experimentally demonstrated the superiority of the new inverter for power supply, (hybrid) electric vehicle (EV) motor drive, reactive power (var) and harmonic compensation. This paper summarizes the features, feasibility, and control schemes of the cascade inverter for utility applications including utility interface of renewable energy, voltage regulation, var compensation, and harmonic filtering in power systems. Analytical, simulated, and experimental results demonstrated the superiority of the new inverters.     

Application of Single—to—Single Phase Matrix Conversion in Conventional Rectifier—Inverter

The principkle of Single-to-single phase matrix electric power conversion is further studied and the conversioin swith function is introduced into conventional rectifier-inverter,thus a general character of the two conversion techniques is discovered.It is characteristic of the switch functiion to follow mains voltage distrotion and mains frequency drift,By utilizing the merit,unidrectional switch duty-rations of the inverter follow the variation of DC-link voltage automatically,thus the size of DC-link electrolytic capacitor can be redued considerably,bringing about improved mains side power factor.Corresponding topologies and theoretical and theotor can be reduced considerably,bringing about improved mains side power factor,Corresponding topologies and theortical and theoretical derivations are given,and so are the simulation results,based on which it is confirmed that the single-to-single phase matrix conversion technique is potentially useful in large scale production,and the introduction of switch function can yield good economic returns.     

一种WPT系统E类高频逆变器的无载保护控制

发射端串联补偿拓扑在基于E类高频逆变器的无线电能传输(WPT)系统中应用广泛。其串联谐振回路存在无载时电流过大,损耗过高等问题。设计一种用于该系统的无载保护控制电路,该电路具有电感电流缓冲及逆变器过流保护功能,且系统发射端在无载时的功耗为0.6 W左右。对于无线电能传输系统的控制电路设计具有参考意义。     

分布式光伏发电系统中的微逆变器技术研究

微逆变器可实现独立的光伏模组最大功率点追踪控制,极大优化并网光伏发电系统的光伏能量转换,提供即插即用概念。光伏微逆变器在功率变换中,常采用高频变压器升压产生期望的输出交流电压,根据直流链配置可以分为直流链、伪直流链和无直流链3种微逆变器拓扑结构。微逆变器控制技术包括最大功率点追踪控制技术、输出电流控制技术、孤岛效应侦测与保证技术等,且功率开关对于改善微逆变器的转换效率至关重要。     

结实型谐振支路及其在软开关变换器中的应用

本文给出了结实型谐振支路实现软开关的工作原理和运行特性 ,详细讨论了结实型谐振支路拓扑在软开关直直变换器和软开关逆变器中的各种应用 .结实型谐振支路可构成升降压软开关直直变换器、具有输出功率自动限制特性的隔离型软开关直直变换器 ,可实现部分串联谐振直直变换器功率管的零电压、零电流开关 ,可用于移相控制全桥直直变换器实现滞后桥臂功率管的软开关 ,可构成结实型谐振极逆变器和结实型谐振直流环节逆变器 .本文对各变换器的工作原理、特性、实现软开关的条件进行了讨论 ,给出了实验和仿真波形 .     

结实型谐振直流环节软开关静止变流器的研究

本文提出了一个新颖的结实型谐振直流环节软开关静止变流器拓扑,对直流环节的软开关工作原理和脉宽调制控制策略进行了详细分析,讨论了逆变桥的离散脉冲控制策略,分析了变流器的工作特性,并通过试验进行了验证.,A novel resonant dc link soft-switching static inverter topology is presented. The soft-switching operation principle and pulse width modulation control feature of dc link is analyzed in detail. The discrete pulse control strategy of inverter bridge is discussed. The operation characteristics of inverter are analyzed and verified by experiment.     

无接触电能传输系统传输效率分析

介绍了无接触电能传输系统的组成及工作原理,以高频变换器为主,对系统进行了分析。为提高逆变器的传输效率,达到降低高频开关损耗的目的,以Matlab/Simulink工具箱为基础建立了SPWM逆变器的仿真模型,并进行仿真。仿真结果显示,当PWM脉冲发生器的输出电压频率为400 Hz、载波频率为1.2 kHz时的传输效率最高。