普传变频器在消防应急电源EPS系统中的应用

本文介绍了如何使用普传P17100变频器的主板端子功能及保护功能实现变频器在建筑行业消防应急电源EPS系统自动调速控制的工艺要求，展望变频器在应急电源EPS系统中应用的前景，变频器常见故障及排除措施。     

变频器在橡胶挤出机系统中的应用

本文介绍了如何使用普传P17000变频器的主板端子功能和保护功能实现橡胶挤出机系统的调速控制的工艺要求。着重介绍橡胶挤出机工艺要求、变频器参数设定实观及其控制过程，变频器常见故障及排除措施等。     

矢量控制变频器在混合动力电动汽车中的应用

本文介绍了如何使用普传P17000矢量控制变频器的主板端予功能、保护功能等实现混合动力电动汽车的低频大转矩及通过汽车油门信号的大小进行凋速的工艺要求，同时实现了节能与环保；着重介绍了变频器在混合动力电动汽车系统中的工作原理，变频器矢量控制的功能参数设置及调试方法，变频器常见故障及排除措施。     

数字下变频器的原理、结构与制作

本文介绍了数字信道机中数字下变频器所起的核心作用与原理,并以Harris公司生产的专用数字下变频器HSP50016为代表,介绍了其主要功能,着重分析了其内部结构和抽取滤波器的特性,最后简要介绍了如何制作自己的数字下变频器。     

台达变频器在恒线速度功能上的应用

恒线速度模式是非常常见的一个功能,可通过很多方法来实现。本文主要是介绍如何通过变频器本身的功能,来实现恒线速度模式。     

高压变频器的“飞车启动”及“星点漂移”功能

本文介绍了高压变频器“飞车启动”及“星点漂移”功能的应用场合,实验的方法及实现的原理,论述了这项功能实际应用的作用及意义,在变频器中的设置方法等。     

台达变频器和C51单片机通讯

台达VFD全系列变频器均能够通过通讯进行参数的读写和控制,随着单片机功能的越来越强大,在嵌入控制中的应用更加广泛。如何实现单片机和变频器之间的通讯是本文的介绍重点。同时本文给出了单片机和变频器通讯的硬件电路图和通讯源程序051,有助于读者掌握台达变频器在嵌入式系统的通讯应用技术。     

正交数字上变频器AD9857的使用

介绍数字正交上变频器AD9857的原理、功能和基本使用方法以及如何通过单片机8051实现对它的编程控制。     

电容分选机调速系统设计

变频器是当前应用最为广泛的交流调速装置。介绍了变频调速的基本原理,阐述了变频器如何选用以及使用中的注意事项,给出了分选机变频调速系统的设计方案,详细介绍了以变频器和三相交流感应电机为核心的调速系统的硬件设计及变频器的参数设置,总结了变频调速的优势。     

基于PLC和变频器的多电机速度同步控制

在我国,科技和机电一体化水平不断在提升,PLC、变频器在社会各个领域均有所涉及和使用。本文分析了PLC相应的功能,介绍了变频器几种常见的类别;紧接着,对如何利用PLC、变频器来对多电机相应的运行速度实现同步控制这一问题,提出相应的解决方案。     

高速文化纸机变频传动系统设计

文章应用ABB系列变频器于造纸自动化领域,将ABB系列直接转矩变频器和西门子S7-300P LC组成核心控制装置设计一套文化纸机传动控制系统,通过软、硬件设计,较好的实现了文化纸机电气传动控制系统中的负荷分配、速度链、张力控制等功能。本套系统应用后证明:这种基于S7-300PLC和ABB系列变频器的全数字控制系统完全适用中、高速纸机的控制精度和反应速度等控制性能的需要。     

Parallel processing inverter system

A novel method of instantaneous voltage and power balance control of a parallel processing inverter system is proposed. It consists of a high-speed switching PWM (pulsewidth modulated) inverter with an instantaneous current minor loop controller, a voltage major loop controller, and a power balance controller. This system realizes the following functions with only one inverter: constant AC output voltage control with reactive power control, active filtering to absorb load current harmonics, DC voltage and current control as AC-to-DC converter, and uninterruptible power supply (UPS) for stand-alone operation. This system covers a wide application range, including UPS systems, new energy systems, and active filters with voltage control functions     

基于PLC与变频器的交流电机调速系统的探究

变频器是利用电力半导体器件的通断作用将电压和频率不变的工频交流电源转化成电压和频率可调的交流电源,供给交流电动机实现软启动、变频调速等功能的电能变换控制装置。变频器交流调速系统具有良好的调速性能,而且运行效率高、可靠性强、节能效果也较为理想,是全球范围内公认较为先进的调速系统。而PLC是一种程序系统,把二者结合在一起,可实现变频器交流电机调速控制系统的自动化、科技化、智能化的控制。本文将设计探究基于PLC的变频器多段速控制,通过总体方案确定功能要求,选择软硬件,完成输入输出分配及接线端子的连接,最后通过变频器的参数设定和PLC的程序设计完成交流电机多段速控制的操作。     

Enhanced power quality based single phase photovoltaic distributed generation system

This article presents a novel control strategy for a 1-? 2-level grid-tie photovoltaic (PV) inverter to enhance the power quality (PQ) of a PV distributed generation (PVDG) system. The objective is to obtain the maximum benefits from the grid-tie PV inverter by introducing current harmonics as well as reactive power compensation schemes in its control strategy, thereby controlling the PV inverter to achieve multiple functions in the PVDG system such as: (1) active power flow control between the PV inverter and the grid, (2) reactive power compensation, and (3) grid current harmonics compensation. A PQ enhancement controller (PQEC) has been designed to achieve the aforementioned objectives. The issue of underutilisation of the PV inverter in nighttime has also been addressed in this article and for the optimal use of the system; the PV inverter is used as a shunt active power filter in nighttime. A prototype model of the proposed system is developed in the laboratory, to validate the effectiveness of the control scheme, and is tested with the help of the dSPACE DS1104 platform.     

中颖双核DSP芯片SH99F100在直进式拉丝机变频器中的应用

本文介绍了一种新型的直进式拉丝机系统,以及配套的专用变频器原理与实现。此变频器使用中颖电子SH99F100双核DSP芯片作为控制内核。拉伸变频器使用前馈控制、PID控制等先进控制算法,收卷变频器使用异步电机转矩控制算法。整个系统通过485通讯与人机接口进行通讯控制。     

光伏微型逆变器的研究

由于化石燃料日益枯竭,以及环境日益恶化,光伏产业蓬勃发展起来。文章主要研究了光伏微型逆变器,作为光伏发电系统的核心部件,逆变器的性能决定着光伏发电系统的性能。文章在分析微型器拓扑和控制策略基础上研制一台基于DSP的200W微型逆变器。首先对逆变器原理进行了理论分析,并通过MATLAB静态仿真验证了其可行性,并对其进行动态仿真,测试逆变电路的稳定性。最后,按照设计要求完成逆变器硬件电路及软件编写等工作,并对该逆变系统进行试验。给出了试验波形,各项指标满足设计要求。     

Implementation of Hybrid Control for Motor Drives

This paper presents the implementation of a hybrid-control strategy applied to a permanent-magnet synchronous-motor (PMSM) drive. Hybrid control is a general approach for control of a switching-based hybrid system (HS). This class of HS includes a continuous process controlled by a discrete controller with a finite number of states. In the case of ac motor drives, in contrast to conventional vector control like proportional-integral control or predictive control, where the inverter is not taken into account by the controller, hybrid control integrates the inverter model and considers the state of the inverter as a control variable. It allows to obtain faster torque dynamics than vector-control algorithms. The hybrid control algorithm requires both computing velocity for real-time implementation and code flexibility for management of low-performance functions and analog-digital interfaces. Codesign appears as a promising methodology for partitioning hybrid-control algorithm between software (flexible) and hardware (velocity) while taking care of overall time constrains. In this paper, the implementation of hybrid-control algorithm for a PMSM drive is performed through a codesign approach on an Excalibur board, embedding a CPU-core (Nios-2 by Altera) inside an APEX20KE200EFC484-2X field-programmable gate array. The partitioning of software and hardware parts is explained. Experimental results show the effectiveness of the implementation. Performances, advantages, and limitations are discussed.     

Control of Single-Phase-to-Three-Phase AC/DC/AC PWM Converters for Induction Motor Drives

This paper proposes a novel control scheme of single-phase-to-three-phase pulsewidth-modulation (PWM) converters for low-power three-phase induction motor drives, where a single-phase half-bridge PWM rectifier and a two-leg inverter are used. With this converter topology, the number of switching devices is reduced to six from ten in the case of full-bridge rectifier and three-leg inverter systems. In addition, the source voltage sensor is eliminated with a state observer, which controls the deviation between the model current and the system current to be zero. A simple scalar voltage modulation method is used for a two-leg inverter, and a new technique to eliminate the effect of the dc-link voltage ripple on the inverter output current is proposed. Although the converter topology itself is of lower cost than the conventional one, it retains the same functions such as sinusoidal input current, unity power factor, dc-link voltage control, bidirectional power flow, and variable-voltage and variable-frequency output voltage. The experimental results for the V/f control of 3-hp induction motor drives controlled by a digital signal processor TMS320C31 chip have verified the effectiveness of the proposed scheme     

逆变电源并联技术控制策略综述

逆变电源并联控制技术,不仅能够提高系统的容量,而且可以大大提到系统的可靠性,是实现模块化、高可靠性冗余逆变电源系统的基础。本文简要回顾了逆变电源并联技术发展过程中出现的不同控制策略和拓扑结构,包括主从控制（MSC）;中点控制（CMC）;循环链式控制（30）;基于功率均分控制和基于分散逻辑的控制策略,并对各自的特点进行了...     

一种便携式发电箱的设计

在外旅游或者没有电源的情况下,便携式光伏发电箱可以实现手机、手电筒、剃须刀等能量补给及夜晚照明。文章主要介绍了光伏发电箱的太阳能发电系统,该系统由光伏电池、蓄电池、控制器、逆变器、数据采集板、上位机等几部分组成;文中对该系统各部分的功能和相互联系进行了分析;重点叙述逆变器的设计,包括电路结构、DSP软件的设计、PWM波形的产生原理;通过数据采集板和上位机可实时监测系统的运行状况,具有一定的市场潜力。