基于极点配置的400Hz逆变电源系统设计

针对单相400Hz逆变电源系统的控制特点,引入输出电压瞬时值外环和电感电流内环的双环反馈控制,采用极点配置与PI控制相结合的方法对系统进行了设计,并根据状态空间理论建立了系统数学模型。仿真结果表明,该方案动态响应快、稳态精度高、THD小、带负载能力强。     

瞬时值反馈逆变电源研究

逆变电源中传统控制方案存在不足,在这些反馈系统中往往加入积分环节来减小静差,但在实际系统运行的过程中不一定起到了相应的作用。文中介绍了一种基于电容电流内环的输出电压外环瞬时值反馈的逆变电源控制方案;建立系统模型;分析了调节器中积分环节对系统的影响,并通过仿真进行验证。     

电压型逆变器输出波形控制技术

文中将目前逆变器输出波形控制技术分为基于周期的控制和瞬时值反馈控制。基于周期的控制是通过对误差的周期性补偿,实现稳态的无静差效果,主要包括重复控制和谐波反馈控制。瞬时值反馈控制利用快检测,及时对逆变器的输出波形进行校正,主要包括瞬时值内环反馈控制、PID（单闭环）控制、双闭环控制、线性多变量状态反馈控制等。在对这些控制方法的特点作了相应的分析,从波形控制的实际要求出发,提出了最有前途的方案。     

两种双环控制方式对并联逆变器的影响

电压电流双环控制策略对单相逆变电源有一定的优越性,不同的采样电流方式对逆变电源输出电压外特性有着不同的影响。在控制参数一致的情况下进行对比分析,电感电流反馈方式对其输出电压外特性的影响较大,对并联逆变电源的环流影响较小;电容电流反馈对输出电压外特性的影响较小,对并联逆变电源的环流影响较小,所以文中并联系统采用电容电流反馈方式作为内环调节;通过MATLAB软件中的simulink工具验证了理论的正确性。     

Delta型UPS主逆变器控制策略的研究

针对传统UPS主逆变器采用PID控制方法实现系统反应的快速性,而稳态特性不足的缺点。提出一种基于瞬时值反馈控制和重复控制的新型逆变电源控制方案,利用重复控制改善了系统的稳态特性。利用瞬时值反馈控制改善了系统的动态特性。通过PSIM9.0软件仿真分析和试验结果表明,本控制方案获得了良好的稳态和动态特性。     

单相400Hz逆变电源设计研究

研究了基于数字信号处理(DSP)的单相电压型脉宽调制(PWM)逆变电源的实现方案,给出了逆变电源的系统框图,利用状态空间平均法建立了逆变器数学模型,使用输出电压和滤波电感电流瞬时值作为双闭环反馈的控制策略,利用Simulink建立逆变电源的仿真模型。仿真结果表明,基于双环控制的逆变器动态响应快,鲁棒性强,能够产生较好的稳态输出电压及较低的总谐波畸变率。     

改进的单相全桥逆变器双环控制研究

双环控制外环为电压环,而内环则分为电感电流内环和电容电流内环。在此对这俩种方法的不同之处进行了理论分析,为了改善该种控制系统在抗负载扰动方面的不足,在双环控制的基础上引入了负载电流前馈的设置。通过负载电流前馈控制的设置,有效地提高了该种控制抗负载的扰动性能,从而增强了系统的稳定性和改善了逆变器电压输出波形质量。     

新型PWM整流器的研究

阐述了PWM整流器四象限运行的工作原理，针对直接电流控制，采用双闭环（电压外环和电流内环）控制的设计思路，采样网侧两相电流瞬时值，通过3s／2r坐标变换得到网侧电流的有功分量和无功分量，直接控制网侧电流的相位和幅值，并设计了PWM整流器的实验装置。实验结果表明所采用的控制方法正确可行，装置性能良好。     

电容储能式高速电磁阀驱动电路的研制

本文介绍了一种电容储能式高速电磁阀驱动电路。通过采用高端电流检测反馈控制PWM输出实现了对电磁阀电流的精确控制。与传统的电磁阀驱动电路相比，其控制逻辑简单，更符合电磁阀的电流响应特点，且有利于降低功耗和防止电磁阀过载。     

DSP控制的IPM正弦逆变电源系统硬件电路设计

在介绍正弦逆变电源系统主流硬件电路和控制方案的基础上,结合具体设计要求,给出逆变电源系统中整流电路和逆变电路中功率模块的选取原则,滤波电容容值的计算和应用方法,输出滤波电路中电感和电容的计算方法.设计了IPM模块的外部驱动电路和缓冲电路,并介绍了基于DSP控制的硬件保护电路和电流、电压采样处理电路.最后给出了以该电路完成的逆变电源系统的实验波形和结论,验证了该电路设计的正确性和可靠性.     

H∞ loop-shaping controller designs for thesingle-phase UPS inverters

This paper proposes the H_∞ loop-shaping approach to the designs of sinusoidal output voltage tracking controllers for single-phase UPS inverters. Selection of weighting functions is introduced, which is quite different from the case of step tracking. By modeling the uncertainty in load as plant output multiplicative perturbation, two H_∞ loop-shaping control schemes that use only a capacitor voltage sensor are presented. The first design adopts a single-loop control scheme which has the advantage of simple control structure and easy implementation. But its transient performance and robustness are not satisfactory. The second controller with a dual-loop structure, additionally employing output of a capacitor current estimator as feedback, provides improved performance over the single-loop scheme and has the feature of low distortion, good regulating performance and insensitivity to the variation in load. Simulation and hardware experimental results, with comparison to the PI-based multiple feedback loop design, are given to validate the robustness property and regulating performance of the proposed controllers     

基于前馈加双环控制的逆变电源设计

介绍一种前馈加双环控制技术的逆变器,它的双环控制包括一个电容电流内环控制和一个瞬时电压外环控制。通过分析该控制策略的工作原理,应用DSP TM320F2812对控制系统进行了设计。试验结果显示逆变器有很好的正弦波输出波形,快速的动态响应,优良的负载特性和高精度的输出电压。     

两种逆变器双环反馈控制技术分析与比较

为了提高逆变器的稳定性和供电质量,文中介绍了一种基于极点配置的逆变器瞬时电压电流PI控制器的设计方法,建立了系统模型,比较分析了基于电感电流反馈控制和基于电容电流反馈控制技术。仿真结果表明,基于电感电流电压双环控制技术具有较好的输出特性。     

Digital control strategies for sinewave-output cycloconverters

Digital control strategies for obtaining sinewave output for a current-source cycloconverter with fast dynamic response are presented. The proposed dual-multiprocessor control system ensures high-quality output. By means of a parameter estimator, it is possible to deduce the instantaneous voltage reference for the cycloconverter without resorting to a high-gain loop. With an appropriate forgetting factor chosen, the estimator is capable of fast tracking, and a reliable, stable voltage reference is thereby produced. Improvement using digital feedback control is achieved by adjusting the loop gain according to the instantaneous input reference level. The resulting current source shows excellent steady-state and transient performance in response to system disturbances, and it generally achieves good waveforms. It also works for induction motor loads under normal running conditions and should find wide application as an adjustable-frequency high-performance power convertor     

Analysis and design of a multiple feedback loop control strategyfor single-phase voltage-source UPS inverters

This paper presents the analysis and design of a multiple feedback loop control scheme for single-phase voltage-source uninterruptible power supply (UPS) inverters with an L-C filter. The control scheme is based on sensing the current in the capacitor of the load filter and using it in an inner feedback loop. An outer voltage feedback loop is also incorporated to ensure that the load voltage is sinusoidal and well regulated. A general state-space averaged model of the UPS system is first derived and used to establish the steady-steady quiescent point. A linearized small signal dynamic model is then developed from the system general model using perturbation and small-signal approximation. The linearized system model is employed to examine the incremental dynamics of the power circuit and select appropriate feedback variables for stable operation of the closed-loop UPS system. Experimental verification of a laboratory model of the UPS system under the proposed closed-loop operation is provided for both linear and nonlinear loads. It is shown that the control scheme offers improved performance measures over existing schemes, It is simple to implement and capable of producing nearly perfect sinusoidal load voltage waveform at moderate switching frequency and reasonable size of filter parameters. Furthermore, the scheme has excellent dynamic response and high voltage utilization of the DC source     

Low-noise self-referenced CMOS oscillator

A new low-noise CMOS oscillator architecture is presented. The oscillator comprises of a loop formed by a switched capacitor integrator which sets the control voltage to a voltage controlled oscillator (VCO). The VCO output provides a clock for the integrator, thus closing the feedback loop. Phase noise reduction is obtained by suppressing the VCO noise by the feedback loop. Design considerations and simulation results supporting the architecture are presented.     

A fast transient response low dropout regulator with current control methodology

A transient performance optimized CCL-LDO regulator is proposed.In the CCL-LDO,the control method of the charge pump phase-locked loop is adopted.A current control loop has the feedback signal and reference current to be compared,and then a loop filter generates the gate voltage of the power MOSFET by integrating the error current.The CCL-LDO has the optimized damping coefficient and natural resonant frequency, while its output voltage can be sub-l-V and is not restricted by the reference voltage.With a 1μF decoupling capacitor,the experimental results based on a 0.13μm CMOS process show that the output voltage is 1.0 V;when the workload changes from 100μA to 100 mA transiently,the stable dropout is 4.25 mV,the settling time is 8.2μs and the undershoot is 5.11 mV;when the workload changes from 100 mA to 100μA transiently,the stable dropout is 4.25 mV,the settling time is 23.3μs and the overshoot is 6.21 mV.The PSRR value is more than -95 dB.Most of the attributes of the CCL-LDO are improved rapidly with a FOM value of 0.0097.     

Adjustable shunt regulator based control systems

Adjustable shunt regulators known as TL431 are extensively used to build the control systems in switched-mode converter applications. The resulting control system is typically a two-loop system, where one loop defines the low frequency behavior, and the other loop the higher frequency behavior, respectively. The shunt regulator is regarded to possess characteristics similar to an operational amplifier, even if it is basically a transconductance amplifier having current as an output signal instead of voltage as well as positive feedback instead of negative feedback. The small-signal response of a shunt regulator shows that it may be modeled as a voltage-controlled current source with a small transconductance gain and an equivalent capacitor as output impedance, which may be extracted from the open-loop frequency response by inspection. The variance in the parameters may be high depending on the manufacture, and operating point, i.e., cathode current, which is normally chosen to be close to 1 mA due to the specifications. The analysis shows, however, that the cathode current should be at least 5 mA for stable equivalent circuit parameters. If low cathode current is used, the control system may not be better than a Zener diode replacing the shunt regulator.     

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