采用无桥拓扑的部分有源PFC在变频器中的应用和实现

在变频器前级所采用的单相有源功率因数校正器（PFC）中，一般采用完全PFC方案，而且使用的功率器件多．PFC升压电感昂贵，因此具有效率较低和成本较高等不足。鉴于此，提出了一种采用无侨PFC功率模块和部分PFC技术的新型单相PFC方案，在分析部分PFC的原理基础上，通过MCU软件编程给予实现。实验结果表明，该新型单相PFC方案具有校正效果良好，控制简单，成本低等优点，同时EMI得到了抑制，效率提高了2～3%，节能效果明显。     

欧瑞变频器在造纸机传动系统中的应用

文章应用欧瑞E2000系列通用变频器和西门子S7-200P LC组成的基于RS485通讯的文化纸机传动控制系统,通过软、硬件设计,较好的实现了造纸机传动控制系统中的负荷分配、速度链、张力控制等功能。现场应用验证,这种基于S7-200PLC和欧瑞E2000系列变频器的全数字控制系统适用中、高速纸机的速度、可靠性等控制性能的需要,获得了满意的控制效果。     

基于ACS550变频器的恒压供水控制系统设计

文章描述了由ABB公司ACS550变频器组成的恒压供水控制系统的组成，结构及工作原理。系统直接采用变频调速方式自动调节水泵电机的速度，节省了系统投资。文章在论述工作原理，系统配置基础上主要对ACS550变频器的PFC应用宏的参数设置进行了详细分析及描述，为初次应用此类变频器进行供水设计的场合和个人提供了详细的参考依据。     

部分有源PFC技术的理论分析与实验研究

变频空调的前级AC/DC功率电路一般采用完全有源功率因数校正（PFC）方案,能够带来非常好的校正效果。但是由于传统BOOST完全有源PFC方案得到的直流电压较高,使得功率器件的开关应力较大,系统效率较低,不利于大功率应用。鉴于此提出了一种结合有源PFC技术和无源PFC技术、并采用双端脉冲控制策略的Buck型的部分有源PFC方案。在理论分析这种部分PFC原理的情况下,进行了仿真验证,最后进行了具体实现。该方案适用于输出电压要求为Buck型、功率较高、对EMI要求较高的PFC应用场合,尤其适用于大功率的PFC应用场合,具有很好的应用价值。     

产品技术

富士FRENIC-MEGA高性能多功能变频器;欧瑞传动推出了EPS1000应急电源专用系列变频器;易能EDS700强势进入纺织行业;ABB推出紧凑式ACS55型变频驱动器     

基于单周期控制的交互式PFC数字控制技术

分析了单周期功率因数校正(PFC)技术的工作原理,提出了单周期PFC技术的数字控制方案,并将其应用到大功率交互式PFC系统。采用TI公司的TMS320F28035DSP芯片,设计了一套单周期交互式PFC的数字控制系统,对单周期交互式PFC技术的数字控制方案进行了实验验证。实验结果表明了该数字控制方案的可行性。     

欧瑞变频器在英格索兰空压机上的应用

空气压缩机已有几百年的应用历史，在机械结构方面也经过了100年的发展，原理是成熟的，但大容量的空压机在工作过程的带载启动和泄载一直是一个难题。它的用途广泛，可以用千冶金、机械制造、矿山、电力、纺织、石油化工等各个行业。本文从各方面详细介绍了欧瑞传动生产的变频器产品在英格索兰空压机的改造及应用过程。     

欧瑞变频器在线切割机床的应用

本文综述了线切割机床的种类、特点和欧瑞线切割机床专用变频器在线切割机床上的具体使用和好处。     

几种实用的泵类／风机控制方案浅析

本文以水泵为对象,介绍了泵类／风机控制（PFC）的工作原理,给出了几种PFC控制系统解决方案,并进行了简单的比较分析;最后提示读者关注先进的多变频器并联泵控制技术。     

建卓越企业 树百年品牌——走近欧瑞传动电气有限公司

在美丽的胶东半岛烟台,坐落着中国最早致力于交流电机变频调速器研发的高新技术企业之——欧瑞传动电气有限公司。经过十多年的发展,欧瑞传动已经从单一的变频器供应商发展成为目前国内最具规模的集研发、生产和销售于一体的传动与控制产品专业生产厂商之一,并成长为成熟的多领域自动化解决方案提供商。欧瑞传动一直专注于自己的事业、致力于为...     

Single phase three-level power factor correction circuit with passive lossless snubber

Multilevel conversion techniques, power factor correction (PFC) techniques and soft switching techniques are the three research hot points of power electronics. The paper proposes a single phase three-level PFC circuit with passive lossless snubbers which embodies these trends. Firstly, the three-level buck and boost topologies are derived from one bridge leg of the traditional diode clamped three-level inverters. Then, a single phase three-level PFC circuit is presented based on the three-level boost topology, and the principle and implementation approaches of the three-level PFC circuit are described. To realize the soft switching of the main switches and freewheeling diodes, two passive lossless snubber cells are added to the circuit. The operating principle and design considerations of the new circuit are discussed in detail. Finally, a 2 kW prototype of the single phase three-level PFC with the passive lossless snubber is built and tested. The simulated and experimental results indicate that the proposed circuit can realize the function of three-level PFC, increase system efficiency and have no over-voltage stresses on main power switches. Moreover, the power factor of the proposed circuit with the passive lossless snubber is higher than that of the circuit without the snubber.     

Small-signal analysis of a low-cost power control for LCC series-parallel inverters with resonant current mode control for HID lamps

In this paper, a low-cost power control for LCC series-parallel inverters with resonant current mode control for high intensity discharge (HID) lamps is presented. These resonant inverters require controlling the power supplied to the lamp in order to avoid exceeding the maximum lamp power recommended by the lamp manufacturer. The classical control method measures the lamp voltage and current and they are multiplied analogically, obtaining the lamp power consumption measure. This control circuitry results very complex due to the lamp voltage and current wide variations range during ignition and discharge processes. Assuming a regulated input dc voltage (bus voltage) provided by the power factor correction (PFC) pre-regulator and an inverter constant efficiency along the lamp aging, the lamp power consumption may be estimated and regulated properly measuring the inverter average input current. Also, the small-signal analysis performed allows obtaining the small-signal resonant inverter input impedance and studying the connection stability between PFC pre-regulator and inverter. The inverter small-signal analysis has been performed and an electronic ballast prototype for 250-W HPS lamps has been implemented and tested verifying the low-cost lamp power control method proposed.     

New high power, high performance power converter systems

A new, high performance, low cost power converter system architecture is proposed. The system consists of a main converter and a multifunctional load conditioner. The main converter deals with most of the power flow running at a low switching frequency. The load conditioner is designed at a much lower power level running at a high-switching frequency. The load conditioner can (1) act like a current source and inject harmonic currents required by the load; (2) act like an active resistor to provide damping to the main converter; and (3) for three-phase inverters, decouple the coupling sources in the main inverter model in the rotating coordinates to make the control loop design for the main inverter much easier. The concept has been proved by simulation and experimental results on a 150 kW high performance three-phase utility power supply prototype. The proposed system configuration can be used in high power DC-DC converters, inverters, PFC and UPS applications     

A Universal Vector Controller for Four-Quadrant Three-Phase Power Converters

Power factor corrected (PFC) rectifiers, active power filters (APFs), static VAR compensators (STATCOM), and grid-connected inverters (GCI) are indispensable elements in distributed generation power systems. PFC rectifiers are essential for load side harmonic and reactive power correction, APFs can suppress the harmonics generated by nonlinear loads or sources, STATCOMs can control the power flow in the grid, while GCIs are the key elements bridging the renewable energy sources and the power grid. Previous theory and experiments have demonstrated that one-cycle control is capable of controlling all above mentioned three-phase converters, featuring excellent performance, simple circuitry, and low cost. This paper further unifies the control key equations for the previously mentioned converters, which results in a universal solution that realizes all these functions with a same controller. The concept has been verified by a 1-kVA prototype and supported by a series of experimental results     

On-chip reliability investigations on power modules actually working in inverter systems

The paper contains the results of temperature measurements for reliability investigations on IGBT modules actually working in inverters for industrial and traction applications. For this, the chip temperature and its transient behaviour have been monitored under different driving conditions of the inverters. Specially prepared IGBT-modules have been used to investigate the industrial and the traction inverters in their electrical and thermal behaviour. The measurement techniques were suitably adapted to the different configurations of the two inverters.     

用于不问断电源的硬开关和软开关逆变器

为了不减少滤波成本，人们不断提高不间断电源中逆变器的脉冲调制频率。在这类逆变器中，有一部分固定损耗是由开关过程引起的。应用软开关技术可以显著减少这些损耗。本文将描述用于不间断电源中具有硬开关和软开关的逆变器。首先，给出逆变器的效率曲线。然后，在实际测量的基础上，分析逆变器的总损耗，开关损耗被分成开关损耗和导通损耗两部分。最后，互比两者的结果。     

On‐site characterisation and energy efficiency of grid‐connected PV inverters

The size of inverters in large grid‐connected photovoltaic (PV) systems is increasing. At present, the largest installed inverters have nominal powers of several hundreds of kW, which makes their characterisation in the laboratory difficult. As an alternative, on‐site characterisation requires only measurement equipment and has the advantage that the inverter is tested in its own PV system under real operating conditions. This paper describes an on‐site testing procedure for assessing the power efficiency of an inverter and the results obtained for 13 inverters with nominal powers between 3.3 and 350 kW. The inverters were tested in PV grid‐connected systems whose aggregate power capacity is nearly 150 MW. The energy efficiency of the inverters tested was also calculated yearly, and the results were compared with both European and Californian energy efficiency parameters, which are widely used in the current PV market. Copyright © 2010 John Wiley & Sons, Ltd.