基于DSP的单相SVPWM技术与零序信号分析

针对单相全桥PWM逆变器,在研究单相逆变电源电压矢量的基础上,首次将空间矢量脉宽调制(SVPWM)技术应用于单相PWM逆变电源,并给出了单相SVPWM算法的DSP实现方法.通过对单相逆变电压调制信号的频谱分析,给出了单相SVPWM算法的谐波倍频特性;通过对单相SVPWM零电压矢量的分析,提出了一种开关模式优化的单相SVPWM算法;通过对单相SVPWM零序信号的分析,论证了单相SVPWM与载波PWM的统一.实验结果验证了单相SVPWM算法的有效性.     

基于ARM7和DSP双核控制的逆变电源设计

为了有效解决逆变电源中存在的因单一复杂控制而带来的系统运行高风险性、控制精度低,反馈调节时间长,系统可扩展性差等缺点,设计实现了一种基于ARM7 Cortex-M3内核的单片机STM32F103和TI C2000系列DSP芯片TMS320F2808的双核控制逆变电源控制电路。通过在一台6kVA工频双变换纯在线式单相小功率逆变电源上进行控制和负载实验。结果表明,该设计方案有效解决了逆变电源系统中因控制核单一而导致的高复杂度高风险性的缺点,具有控制器模块化,抗干扰能力强,反馈调节速度快,内部接口扩展功能丰富等特点。     

基于DSP的SVPWM与载波PWM的统一性研究

 针对脉宽调制(PWM)逆变器,在研究逆变电源电压矢量的基础上,将空间矢量脉宽调制(SVPWM)技术应用于三相和单相PWM逆变电源,分别给出了三相和单相SVPWM的数字信号处理(DSP)算法,给出了一种开关模式优化的单相SVPWM算法,导出了三相和单相SVPWM基于载波调制的调制波形式以及零序信号形式,指出载波零序信号在本质上对应着逆变器零电压矢量作用时间分配与分布,论证了SVPWM与载波PWM的统一,实验结果验证了SVPWM算法的有效性.     

正弦逆变波形的神经网络内膜控制算法

单相逆变电源的输出电压波形质量是衡量其性能的重要指标之一.本文提出了一种正弦逆变波形的神经网络内膜控制算法,建立两个BP神经网络预估器,一个作为单相逆变器的内部模型,预测实际的波形输出;一个根据预测误差建立内模控制器,在线修正和补偿内部模型使之最大程度的匹配单相逆变器.仿真和实验结果表明,该算法克服了系统中存在的不确定...     

逆变器重复控制器设计与仿真

针对实际应用给出了重复控制器内模、补偿器以及周期延迟环节的优化设计方法,推导出了重复控制器的稳定性判断条件和收敛指数。基于3 kVA逆变器硬件和控制参数设计了重复控制器,给出了重复控制器各关键参数的设计过程,并进一步基于重复控制器稳定性判断条件对设计结果进行了稳定性验证。利用Matlab软件对设计结果进行了验证,仿真结果表明在逆变器控制中添加重复控制器后,能明显降低逆变器带非线性负载时输出电压的总谐波失真度值。     

基于dsPIC单片机的单相逆变电源的设计

本文介绍的是一个PI控制单相逆变电源的设计过程。根据单相电压型逆变器电路模型,建立了逆变器开环系统的传递函数,利用dsPIC单片机设计了一个单相逆变电源。逆变电源的仿真和实验结果表明:增加了电压有效值反馈闭环后,逆变器对输出电压的控制能力明显提高。     

单相UPS逆变器复合控制策略

本文通过对脉宽调制(pulse width modulation,PWM)单相不间断逆变电源(UPS)输出特性的分析。提出了一种基于重复控制和模糊PI控制相结合的UPS逆变器的综合控制策略。模糊PI控制提高UPS逆变器的动态特性,重复控制改善UPS逆变器的稳态精度。实验结果表明,该策略能获得具有良好的动态和稳态特性的波形。     

有源电力滤波器抗电网频率波动重复控制策略

为提高重复控制器在电网频率波动时的适应能力和降低数字系统的计算负担，采用一种自适应分数阶多速率重复控制策略改善有源电力滤波器的补偿性能，电流内环控制器包含高采样速率比例控制和低采样速率重复控制两个环节，采用基于拉格朗日插值多项式近似分数阶相位滞后环节的方法构建了重复控制器的内模环节，使重复控制器谐振频率跟随电网频率变化。通过实验，将所提控制策略与传统重复控制进行对比，结果表明所提控制策略的可行性。     

基于重复控制和无差拍控制的逆变电源数字控制技术研究

随着DSP技术的发展，数字控制在逆变电源控制领域的应用受到人们的关注。逆变电源中因非线性负载等因素引起的干扰具有周期性，而这些干扰导致输出波形的畸变具有重复性，采用重复控制策略可以消除输出电压谐波，但该控制方法的动态响应慢。无差拍控制具有瞬时响应快，精度高等特点。文中将重复控制和无差拍控制相结合用于逆变电源数字控制系统中，得到更为完善的逆变电源控制策略。仿真结果表明，由该方法设计的控制器用于逆变电源系统具有输出波形好，动态响应快，适应负载的能力强等优点。     

CAN总线在逆变电源监控中的应用

为了满足逆变电源多模块监控的实时性、可扩展性、灵活性、可靠性等需求,对现场总线进行了研究和分析,系统采用CAN现场总线作为通信传输方式组建了监控网络,对带DSP控制器的逆变电源模块进行监控.在此基础上详细描述了操作站一侧监控方案的设计,重点介绍了CAN总线应用层协议的具体制定以及系统通信软件的设计和实现,实现了操作站与控制器的通信,完成了对逆变电源模块的监控功能.     

High-performance programmable AC power source with low harmonicdistortion using DSP-based repetitive control technique

This paper proposes a new control scheme based on a two-layer control structure to improve both the transient and steady-state responses of a closed-loop regulated pulse-width-modulated (PWM) inverter for high-quality sinusoidal AC voltage regulation. The proposed two-layer controller consists of a tracking controller and a repetitive controller. Pole assignment with state feedback has been employed in designing the tracking controller for transient response improvement, and a repetitive control scheme was developed in synthesizing the repetitive controller for steady-state response improvement. A design procedure is given for synthesizing the repetitive controller for PWM inverters to minimize periodic errors induced by rectifier-type nonlinear loads. The proposed control scheme has been realized using a single-chip digital signal processor (DSP) TMS320C14 from Texas Instruments. A 2-kVA PWM inverter has been constructed to verify the proposed control scheme. Total harmonic distortion (THD) below 1.4% for a 60-Hz output voltage under a bridge-rectifier RC load with a current crest factor of 3 has been obtained. Simulation and experimental results show that the DSP-based fully digital-controlled PWM inverter can achieve both good dynamic response and low harmonics distortion     

Design method of single-phase inverters for UPS systems

This article presents the complete design of a low power voltage source inverter (VSI) dedicated for a UPS system. The analysis of the rectangular PWM-AC voltage spectrum allows for a choice of the basic architecture of the inverter. Output filter parameters were calculated to reduce the maximum amplitude of the output VSI voltage harmonics for the steady-state inverter mode. The choice of the feedback loop type was based on a discussion of the inverter output impedance using a continuous model of the inverter. The parameters of the inner loop digital control for the discrete inverter model were calculated using the Coefficient Diagram Method. The influence of the step load was modelled. The time constant of the inverter closed loop system was selected to ensure sufficient system robustness. An outer feedback loop with a plug-in repetitive controller, simplified owing to the properties of the PID/CDM inner loop control, was introduced to eliminate the periodic disturbances generated by the non-linear rectifier load and the deadtime influence. The experimental verification of the design method is presented.     

Adaptive repetitive control of PWM inverters for very low THDAC-voltage regulation with unknown loads

An adaptive repetitive control scheme is proposed and applied to the control of a pulsewidth-modulated (PWM) inverter used in a high-performance AC power supply. The proposed control scheme can adaptively eliminate periodic distortions caused by unknown periodic load disturbances in an AC power supply. The proposed adaptive repetitive controller consists of a voltage regulator using state feedback control, a repetitive controller with tuning parameters and an adaptive controller with a recursive least-squares estimator (LSE). This adaptive repetitive controller designed for AC voltage regulation has been realized using a single-chip digital signal processor (DSP) TMS320C14 from Texas Instruments. Experimental verification has been carried out on a 2 kVA PWM inverter. Simulation and experimental results show that the DSP-based adaptive repetitive controller can achieve both good dynamic response and low total harmonic distortion (THD) under large-load disturbances and uncertainties     

一种改进的单相逆变器重复控制方案

提出一种新的重复控制方案,通过电容电流内环反馈,消除逆变器固有的谐振峰,简化了重复控制器的设计;改进内模中的Q（z）,采用零相移低通滤波器,提高了系统的稳态精度。Matlab仿真结果表明,该控制方案可以获得高质量的电压输出,在非线性负载条件下THD仅为0.65%,稳态误差只有0.12%。     

一种高性能的三相逆变电源波形控制策略

恒频恒压(CVCF)逆变电源的输出电压波形质量是衡量其性能的重要指标之一。文章采用一种重复控制和双闭环控制相结合的电压波形控制策略,以重复控制器提高逆变电源输出电压的稳态精度,减小总谐波畸变率;以双闭环控制器达到较快的动态响应速度。该方案在一台采用TMS320F240DSP控制芯片的50Hz三相PWM逆变器上得到验证。     

Digital repetitive learning controller for three-phase CVCF PWMinverter

In this paper, a plug-in digital repetitive leaning control scheme is proposed for three-phase constant-voltage constant-frequency (CVCF) pulsewidth modulation inverters to achieve high-quality sinusoidal output voltages. In the proposed control scheme, the repetitive controller (RC) is plugged into the stable one-sampling-ahead-preview-controlled three-phase CVCF inverter system using only two voltage sensors. The RC is designed to eliminate periodic disturbance and/or track periodic reference signal with zero tracking error, The design theory of plug-in repetitive learning controller is described systematically and the stability analysis or overall system is discussed. The merits of the controlled systems include features of minimized total harmonic distortion, robustness to parameter uncertainties, fast response, and fewer sensors. Simulation and experimental results are provided to illustrate the effectiveness of the proposed scheme     

正弦波输出的单相逆变电源设计

逆变电源是将直流电能转变成交流电能的变流装置,是太阳能、风力等新能源发电系统中的重要设备.本文主要介绍了正弦波逆变电源的主电路设计、单片机数字控制系统设计等内容.主电路包含单相全桥逆变电路、升压变压器和LC滤波电路等,数字控制选用dsPIC30F2010 PIC单片机产生SPWM波形,经IR2110芯片驱动MOS管,再经全桥逆变和LC低通滤波电路,最终输出正弦波交流电压.依据设计方案制作了实验样机,实验结果证实样机能输出纯净的正弦波电压,能够满足设计指标要求.     

基于TMS320F2812的高频链逆变器控制系统

采用全桥双向电流源高频链逆变器的拓扑结构,并对此逆变系统进行了研究和设计。该逆变器以TI公司生产的TMS320F2812芯片为控制核心,详细介绍了DSP外围调理电路的硬件设计方案及软件实现方式,在采用电压瞬时值反馈的单闭环控制方式的基础上使逆变器实现了能量的双向流通。整个电路的控制由一片TMS320F2812芯片完成,实现了电源的全数字化控制。最后制作了容量为250VA的实验样机,实验结果验证了该逆变器及其控制方式的可行性和有效性。     

Performance evaluation of an FPGA controlled soft switched inverter

A field programmable gate array (FPGA) based controller is proposed for a dc link series resonant inverter. The basic operation of the zero current switching inverter is briefly described. A strategy of decoupling the control of the dc link current from the load current is identified and referred as decoupled current control (DCC). The use of gate-controlled devices like metal-oxide-semiconductor field-effect transistor/insulated gate bipolar transistor/MOS-controlled thyristor permits a higher resonance frequency at the link of the inverter. The increased frequency enables the application of pulse density modulation technique with a bang-bang controller to synthesise and control the wave-shapes of current and voltage of the inverter. The DCC strategy eliminates the conventional analogue controller. A digital sequence controller has been designed using the state machine technique for the reliable operation of the inverter. The digital design is implemented on a single chip FPGA. To verify the proposed control strategy and the FPGA controller, a prototype has been built and tested. The test results show that a sinusoidal inverter output voltage is maintained with total harmonic distortion less than 5% and a regulation of about 1% from no-load to full-load, including non-linear and transient loads. The performance of the inverter with the FPGA controller is promising and attractive for uninterrupted power supply applications.