一种差分传输参考直扩超宽带系统的实现方案

文中提出了一种差分传输参考直扩超宽带系统的实现方案。该方案利用接收信号的前一个码元作为本地参考信号，解差分恢复出扩频序列，然后通过数字匹配滤波器完成PN码的相关匹配来实现同步捕获，而后采用类似方法解调实现信息恢复。通过对系统的同步性能及其误码率性能进行分析和仿真试验,结果表明该方案不仅可以实现快速的同步捕获，并且具有复杂度低、占用资源少等优点。     

1588v2时间同步技术介绍

本文介绍了1588V2协议中同步以太、频率同步、时间同步的相关概念、原理、算法、实现，以及工程应用中碰到的问题及其解决方案。     

Windows95多线程编程技术及其应用探讨

本文首先介绍Ｗｉｎｄｏｗｓ９５中线程的概念及其调度策略，初步分析了多线程在设计并发程序中的作用，然后详细讨论多线程间实现事件同步和互斥访问的方法。     

一种在同步通讯中用软件实现位同步的方法

文章在介绍同步通讯中用硬件实现位同步的基础上，叙述了用软件模拟数字锁相法实现位同步的方法，及在Ｉｎｔｅｌ８０９８单片机上实现的程序框图，并就相对于硬件方法的优缺点进行了比较，给出了该软件方法在实际使用中的结果。     

扩频码捕获及其FPGA实现

介绍了直接序列扩频通信中m序列的构造及其滑动相关同步捕获方法,并对其同步时间和抗噪声性能进行了理论分析和实验比较。结果表明,滑动相关法在直接序列扩频码同步捕获中具有优越的抗噪性能。文章同时给出了MATLAB的抗噪声估计及其滑动相关法的FPGA实现方法。     

基于扩频技术的多机牵引无线数传系统设计

分析了直接序列扩频通信技术的基本原理，介绍了多机牵引无线同步控制系统及其无线数传系统的硬件电路设计方法，同时给出了将直序扩频技术运用于信息传输，以提高数据无线传输的可靠性实现途径。     

用主动被动分拆法和主动—间隙耦合研究Henon映射的混沌同步

首先用主动－被动分拆法（简称APD）研究Henon同步，该方法实现了全同参数的同步，而对非全同参数出现失同步，可用于保密通信，由于实际中产生连续作用下的耦合同步并非易事，因此，文中还实现了对Henon映射非连续作用（间隙耦合）形式下的混沌同步，只要同步相超过作用的临界值，即可实现准确同步。     

WCDMA中FDD模式下的RNC-Iub/Iur接口同步方案

本文探讨了WCDMA中频分双工（FDD）模式下的RNC-Iub/Iur接口同步技术,阐述了“RNC-Node B”节点同步的概念,实现过程及其应用,讨论了连接帧编号（CFN）的定制技术,提出了CFN的获得方法。此外,还介绍了传输信道同步和接收窗的概念,讨论了传输信道同步的实现过程,并提出了Node B中接收窗的配置方法。     

脉冲同步新方法研究

在现有脉冲同步方法的基础上，系统研究了一种新的脉冲同步方法——通过可变长脉冲间隔的脉冲控制实现脉冲同步，并加以推广，应用于更广范围的非线性系统。以Lorenz系统为例，得到可变长脉冲间隔实现同步的充分条件，与现有的同步条件相比，条件更为宽松，而且得到的同步脉冲间隔上限更大，最后以数字仿真验证了这些理论的有效性。     

基于TDM／TDMA的PON系统上行信元同步实现

介绍一各止行信号元快速比特同步结构及其实现，基于相关算法用多相时钟对输入信号前导码采样，采样对存储序列相关，由要关结果选择最佳钟相位，着重介绍时钟同步实现过程。     

A novel communication strategy for decentralized control of paralleled multi-inverter systems

A new communication strategy for decentralized control of paralleled multi-inverter systems is introduced in this paper. The proposed strategy utilizes the common mode signal's circuit in the paralleled system as a channel of communication between individual inverters. Source voltage synchronization for paralleled inverters is presented to demonstrate its effectiveness. One inverter module acts as a source and a synchronized signal is sent by means of frequency modulation in this channel to all other modules via the common mode current. Each module will then receive and transform the signal to be used as a synchronized voltage command for individual inverters. The approach enables synchronization in the paralleled multi-inverter system and the method is not affected by external factors such as load change, output voltage variation, and different types of loads. The principle of operation, performance of the proposed strategy, as well as the experimental evaluation with three single-phase paralleled inverters are discussed and presented in this paper.     

A synchronization technique for static delta-modulated PWMinverters

A synchronization technique for static delta-modulated PWM inverters is presented. This control strategy removes the frequency modulation inherent in the delta-modulated inverter. Furthermore, synchronization of the PWM pulses with the reference signal ensures balanced phase voltages in three-phase applications. The performance of the modulator is analyzed using digital simulations and is verified with experimental circuits     

皮带运输机专用高压变频器的设计

本文针对由3台高压异步电机拖动的皮带运输机，若采用常规高压变频器实现调速控制时，将出现对转差能量处理、多电机环流、3电机同轴同步控制等技术难度问题。设计出了一种JCC型皮带运输机专用高压变频器，成功地应用在大同马脊梁煤矿外运皮带机。共用了3台6kV／500kW高压电机的变频拖动。拓展了IGBT高压变频器在多电机的同轴、同步控制应用的新领域。     

Optimal control of three-level PWM inverters

An harmonic loss-minimized optimal PWM strategy for three-level inverters is investigated. The different PWM methods for low-, middle-, and high-speed regions are presented. It is shown that, for three-level inverters, the optimized strategy in all speed regions differs from the optimal PWM strategy of two-level inverters. The developed optimal control ensures a minimum of harmonic losses for a predetermined number of commutations of three-level PWM inverters and for a given value of the fundamental harmonic voltage     

Distributed Control of Hybrid Motor Drives

The hybrid inverter fed motor drive with two cascaded multilevel inverters is an attractive option for high performance high power applications such as naval ship propulsion systems due to a number of unique features. There is a natural split between a higher-voltage lower-frequency “bulk” inverter and a lower-voltage higher-frequency “conditioning” inverter in the cascaded system which matches the availability of semiconductor devices. Furthermore, the bulk inverter may be a commercial-off-the-shelf (COTS) motor drive meaning that only the conditioning inverter needs to be custom made. However, a drive involving a COTS bulk inverter would require a distributed conditioning inverter control which works completely independent of the bulk inverter control. In this paper, a set of distributed control methods are developed for the hybrid inverter drive with cascaded bulk and conditioning inverters, requiring only single dc source. Moreover, a solution to the practical problem of instant synchronization between the two inverters is presented. Laboratory measurements on a 3.7-kW induction motor drive validate the proposed control. Various practical considerations (such as low$m$-index performance and capacitor precharging options) are discussed and their solutions provided.     

独立太阳能扬水系统专用变频器的开发

开发完成独立太阳能能扬水系统专用变频器，具备全自动运行、最大功率点跟踪控制、运行数据存储等功能。针对无蓄电池的太阳能扬水系统特性，采用自主研究的混成最大功率点跟踪控制法和优化最小调节步长。在光照强度快速变化的状况下，新的最大功率点跟踪疗法比传统方法具有型高的响应速度、更好的稳定性。长期运行试验表明，专用变频器各项技术指你优良，性能稳定，可靠性高，能够确保系统在最大功率点的稳定运行。     

新型太阳能并网逆变器分析研究

传统的太阳能并网逆变器通常采用PI控制策略,但传统PI控制策略具有控制精度不高,鲁棒性较差的缺点。针对传统PI控制的缺点,对太阳能并网逆变器的控制策略进行了改进,提出一种新型的基于直接电流跟踪控制的太阳能并网逆变器控制策略。该控制策略将传统PI控制和现代重复控制理论相结合,能够有效抑制电网侧和负载侧对并网输出电流的周期性扰动,降低并网电流的THD。实验结果表明,新的控制策略可以有效改善并网电流波形,同时可以保证逆变器输出电流与电网电压的同频同相,满足太阳能并网发电的要求。     

双闭环逆变器控制策略仿真研究

针对开环逆变器波形畸变大的缺点,文中采用双闭环控制策略,并应用Matlab的Simulink工具对单相半桥、三相半桥逆变器的开环,双闭环控制条件下的逆变器进行仿真,结果验证了双闭环控制逆变器的优越性。     

Decoupling Control Strategy for Single Phase SPWM Parallel Inverters

A deconpling control strategy of inverter parallel system is proposed based on the equivalent output impedance of single phase voltage source SPWM （sinusoidal pulse width modulation） inverter. The active power and reactive power are calculated in terms of output voltage and current of the inverter, and sent to the other inverters in the parallel system via controller area network （CAN） bus. By calculating and decoupling the circumfluence of the active power and reactive power, the inverters can share load current via the regulation of the reference-signal phase and amplitude. Experimental results of an 110V/2kVA inverter parallel system show the feasibility of the decoupling control strategy.     

Flying capacitor multilevel inverters and DTC motor drive applications

In this paper, the requirements imposed by a direct torque control (DTC) strategy on multilevel inverters are analyzed. A control strategy is proposed in order to fulfill those requirements when a flying-capacitor multilevel inverter is used. Simulation and practical results will confirm the performance of the proposed strategy when using the multilevel inverter to control an induction motor by the DTC principle. Also, the advantages of using a multilevel inverter with a DTC strategy are shown by simulation results.