电气化铁路供电系统电能质量补偿器的混合补偿方法研究

为了提高牵引供电系统的电能质量（PQ）,降低补偿器的额定功率和运行成本,提出了一种静态无功补偿器集成的铁路电力调节器（RPC）。 RPC是交流电气化铁路系统中广泛使用的设备,用于增强主网络的PQ指数。该设备的下一代产品是有功电能质量补偿器（APQC）。本文提出了一种混合技术来解决上述问题。将SVC作为辅助设备与主补偿器...     

An overview of energy efficient solid state LED driver topologies

LED lamps are projected as prospective successors of incandescent lamps with high efficiency and a long lifetime. Therefore, there is a need to develop energy efficient LED driver topologies for achieving constant current regulation, despite the effects of temperature on the LED V-I characteristics. This paper presents the salient features of various LED driver topologies with a focus on power density, multi-string operation, renewable energy utilization, soft switching, optical wireless communication, reliability and size. The performance of the above topologies is analysed in terms of the number of components, converter switching frequency, galvanic isolation, power rating and efficiency. This paper takes a look at efficiency improvement methods while dwelling on aspects of lifetime and reliability prediction of LED drivers. The paper will anticipate some of the future trends associated with the adaptation of wide bandgap power semiconductor materials, smart LED lighting for the internet of things (IoT) and programmable LED lamp drivers. This detailed technology review is extremely useful for researchers, designers and engineers in choosing the right topology.     

一种测量模数变换器孔径晃动的方法

孔径晃动是模数变换器（ＡＤＣ）的一个重要性能指标，但目前还没有一种完善的测量方法。文中提出了一种用两个不同频率正弦信号作输入的频谱累加平均方法来测量实际ＡＤＣ孔径晃动，分析了测量误差，指出了减小测量误差的途径：在ＡＤＣ模拟带宽允许范围内尽可能提高较高一个输入信号频率；较高一个输入信号频率选定后，另一个输入信号频率尽量低；通过增加数据长度和累加次数的方法更精确的估计噪声能量。作者进行了计算机模拟，模     

分布式变换器的结构和控制体系

着重讨论了基于功率集成技术的分布式控制功率变换器的结构形式和控制体系.对采用分布式控制后系统出现的新特点进行了总结和分析.对构成分布式变换器的电力电子标准模块的功率级选择、控制器功能以及组网方式进行了详细的描述.分布式控制的变换器有望提高系统可靠性、灵活性,解决大规模生产中开发周期长、成本高的问题,在未来的电力电子应用中有着广阔的前景.     

Adaptive passivity-based control of average dc-to-dc power converter models

An adaptive feedback regulation scheme is proposed for the stabilization of average models of dc-to-dc power converters exhibiting unknown but constant resistive loads. The scheme is based on a dynamical feedback policy which suitably modifies the total energy of the closed-loop system while inducing appropriate damping injections on the desired stabilization error dynamics. The performance of the proposed adaptative regulators is tested through computer simulations including stochastic perturbation inputs. © 1998 John Wiley & Sons, Ltd.     

开绕组无刷双馈风力发电机直接功率控制容错策略

针对无刷双馈发电机提出了一种控制绕组采用开绕组拓扑(OW-BDFG)的馈电方案,将三相控制绕组两端打开分别连接变流器构成双两电平变流器(D-TLCs)馈电拓扑,对机侧变流器功率器件IGBT因故障切除后的容错控制策略进行深入分析,提出了功率偏差比较直接功率控制(PEC-DPC)的D-TLCs电压空间矢量优化方案。对比分析了8/4极25 kW样机的仿真及实验结果,表明：当机侧变流器1个或2个IGBT被切除后,所提OW-BDFG的PEC-DPC仍可实现变速恒频、最大功率点跟踪及单位功率因数控制,进一步提高了该发电机系统的可靠性和鲁棒性。     

A Digitally Controlled Shunt Capacitor CMOS Delay Line

Delay-controlled CMOS delay lines have been proved useful in a number of applications, notably the digitization of short time intervals. This paper introduces a new kind of CMOS delay line, in which the delay element is an array of capacitors controlled by a digital signal vector. This choice allows for a robust implementation of the circuitry controlling the delay generation, while the maximum speed attainable by the line is high compared to the maximum speed achieved by other delay line architectures. The delay line presented here was designed to produce an accurately tunable 16 × 0.5ns delay under large temperature, supply voltage, and technological process quality variations.     

Standardizing the metrological assessment of waveform digitizers: problems and perspectives

The problem of the metrological qualification of data acquisition systems and of waveform recorders is a fundamental issue for both users and manufacturers of digital instruments. The need for an improved industry standard leading to unification and standardization in this field is a very pressing requirement. Users have to receive technical specifications written in standard format and manufacturers have to obtain this information following standard test procedures. The main goal of this paper is to underline the need of unifying the modeling, identification and optimization of ADC-based systems, by minimizing the number of experimental procedures to be employed. This work, more than giving solutions, is intended to state clearly a set of problems that we hope will gain the attention of researchers in this field.     

一种新型柴油机的热功参数分布式检测系统的设计

介绍了以８０５１单片机为基础,５８６为主机的多功能柴油机热功参数分布式检测系统的设计思想和工作流程,分析了系统的模拟电路和数字接口电路,并给出了接口硬件电路和实例。     

AC motor traction drives — A status review

The paper presents a brief review of modernac motor traction drives, powered from 25 kV power frequencyac supply. Drives employing voltage source inverters, current source inverters, and induction and synchronous motors have been discussed.