浅析微机故障录波器通信网络的设计

分析了故障录波器中故障信息传输的特点，提出了故障录波器通信网络各部分的通信形式和采用的通信协议，以及故障录波器与电力管理信息系统(MIS)互联采用双网卡设计的解决方案。     

计算机失磁保护的研究

根据失磁过程机端电压特性和励磁电压变化特性,提出了一种综合的、较为完备的计算机失磁保护方案。本方案综合运用了失磁保护中几种常用的主判据,对传统的静稳极限阻抗圆动作特性进行了改进,并突出了转子判据的作用,从而提高了失磁保护的可靠性。根据该方案设计的计算机失磁保护装置已成功地应用于华中电力系统。     

微机型故障录波器联网系统的设计与实现

对目前我国微机型故障录波器联网面临的问题及特点进行了分析,提出了一种分层管理模式联网的设计方案及其实现方法。     

微机保护的定值计算

合理、正确的继电保护定值是可靠实现电网保护的必要条件,但目前大量应用的微机保护的部分定值不能完全按照整定规程计算,通过分析微机保护硬件软件的特点,比较了微机保护与传统保护的异同,认为微机保护的应用提高了继电保护的运行水平,但同时提高了对整定计算人员的要求,针对目前国内常用的微机型线路保护和变压器保护装置,具体讨论了部分定值的整定方法,认为微机保护应考虑各ＣＰＵ间定值的配合;时间元件可精确整定;阻抗     

用微机实现的一种实时快速FFT算法

有许多工程实际问题要求用FFT实时处理输入采样信号。但是,目前现成的各种FFT软件包处理速度太慢,即使用汇编语言精心设计的FFT程序也往往不能满足实时的要求。本文提出了一种工程上完全允许的近似和简化的处理方法,使一个128点的FFT过程只占用了5～10ms的CPU时间(CPU为286),比一般用高级语言编写的FFT程序快了约100倍。     

GTO驱动电路的设计

本文通过对ＧＴＯ晶闸管门驱动要求的分析，给出了其驱动电路及供电电源的设计方法。     

DESIGN AND PERFORMANCE OF A MICROCONTROLLER-BASED SWITCHED RELUCTANCE MOTOR DRIVE SYSTEM

ABSTRACT

There is a growing interest in the use of switched reluctance motor (hereafter referred to as SRM) drive systems for various applications in diverse areas such as defense, home appliances, etc. Hence the design of a low cost controller for the SRM drive with high performance capabilities gains added significance. Microcontrollers (single chip computers) have emerged to fill this need in motion control. They provide both software control and flexibility in the reconfiguration of control algorithms. They also minimize the number of chips thus enhancing the system reliability at a low cost. This paper introduces a microcontroller-based controller for SRM drives with only an EPROM and two ICs for the logic access constituting the peripheral circuits. The entire control scheme including the pulse width modulator is implemented by software. A Siemens 80535 microcontroller chip has been chosen for this study.     

DESIGN OF VARIABLE SPEED INDUCTION MOTOR DRIVE WITH A CURRENT-FED INVERTER

ABSTRACT

A closed-loop speed control scheme with reversing and regenerating capability for a squirrel-cage induction motor is described. The scheme makes use of a fully-controlled bridge for a.c. to d.c. conversion, a currend-fed inverter for generation of variable frequency a.c. supply for motor and an analogue tachogenerator for speed feedback signal. The current-reference signal is generated by a novel slip calculator. This paper describes the slip calculator and the design of controllers based on an approximate model of motor. Experimental results validating the methods used for design of controllers are also presented.     

A MICROPROCESSOR BASED INDUSTRIAL LOAD BUS STATIC VAR CONTROLLER

ABSTRACT

An unique microprocessor based thyristor controlled method of controlling the VAR supply at the load node of a typical distribution system has been developed. The developed model is a totally software dependent static VAR compensator (SVC) enhancing its reliability and flexibility of control. The conventional hardware complexity being eliminated, a prototype working model has been developed for application in the laboratory. The developed scheme has also been found to be advantageous due to its symmetrical and accurate triggering control and quick response.     

微机式继电保护装置应用程序可靠性预计

对于微机式保护装置的应用程序（软件）提出了一种新的实用性较强的可靠性预计方法,并且依照分析拓扑中命题相互等价的证明图式方法进一步说明它的合理性。     

基于IEC 61850标准的微机保护数据通信模型

以超高压线路成套微机保护装置为例，探讨了如何采用IEC61850标准的数据建模概念建立微机保护数据通信的模型，给出了距离保护元件的数据对象定义。该方法同样适用于其他类型的微机保护。     

单片机实现电网运行动态模拟仿真

本文介绍了基于ＭＣＳ８０９８单片机的智能化微机保护调试仪实现电网故障电流电压暂态波形动态模拟仿真的软硬件设计原理及功能和特点。     

一种新的微机保护交流采样快速算法

本文提出一种利用半波富氏算法消除衰减非周其分量对基波分量影响的快速算法,新算法的数据窗是个周期的采样值加两个采样点,而其滤波效果远远优于半波富氏算法。     

变电所二次设备微机全自动在线检测软件的研究

本文探讨了变电所二次设备微机全自动检测软件的总体结构方案，提出了一种模块化黑板式表格结构试验方法，成功地解决了因需检测的试验项目及元器件太多而有可能导致软件结构冗长的问题。该方案已用于我国自行研制并投入使用的电气化铁路变电所二次设备检测车中，取得了满意的效果。     

分立元件构成的电力电子集成功率模块的设计

该文提出一种采用分立元件构成的用于开关电源用电力电子集成功率模块的设计方案，包括软开关功率因数校正电路和移相全桥型软开关电路两种模块。集成模块中含有主电路开关元件和部分驱动元件。该模块采用多层布线的叠层结构，电路设计紧凑，减小了分布参数，使电路工作时的电压和电流应力明显减小，从而提高了电路的性能，并降低了电磁干扰。该结构方案实现了双面散热，从而降低了散热热阻，提高了可靠性。文中分别给出了两种集成模块的满功率实验结果，电路工作正常，达到了预期的性能。     

基于DSP的光电式电流互感器的实用化设计

介绍一种以具有快速浮点运算能力的数字信号处理器（DSP）为核心，集合了光纤、通信、微机技术的光电式电流互感器（OECT）的实用化设计方案。该方案利用光纤进行高压端和低压端的数据通信并作绝缘。OECT集电流测量和谐波分析于一体，同时还提供远程计算机接口和继电保护接口。试验表明，OECT具有结构简单、安装方便、抗干扰能力强和测量精确度高等特点。     

DEVELOPMENT OF LARGER RATING INDUCTION REGULATOR FOR USE IN MICROPROCESSOR BASED TEST SYSTEMS

ABSTRACT

This paper outlines the development o-f a larger rating special purpose induction regulator for use in microprocessor based high-voltage test system. In general, one can identify several applications, for which an overview is given at the end.

Specifically, major design considerations were touched upon in brief to make the design economical for efficient operation. While considering the general utility and reliability of operation of the equipment, the operational advantages are also highlighted.

The concept of new delta-winding for a closer and wider control of output voltage, starting from fraction of volts is the vital issue brought out in this paper.

An actual model was analysed for scrutiny of various test parameters and they are being discussed.     

微机型保护和录波装置联网方案的探讨

就河北南网２２０ｋＶ系统在役的微机型保护和录波装置的联网问题,从联网的目的及必要性、联网应遵循的技术原则、国内几种联网方案的比较等方面做了一些探讨,并提出了新的联网设想。     

MICROCOMPUTER BASED EFFICIENT AUTOSYNCHRONOUS MOTOR DRIVE

ABSTRACT

The paper presents the development of a microcomputer based digital control system for the current source load-commutated inverter fed synchronous motor drive. The control system comprised two loops: (i) Fast acting dynamic speed and torque angle control loop to ensure the self synchronous operation of the drive system, disturbance rejection and robustness of the complete motor drive system. (ii) Slow acting quasi steady-state efficiency maximization loop that ensures that the drive load is met at minimum source power input.     

MICROPROCESSOR BASED NONLINEAR EXCITATION CONTROLLER FOR SYNCHRONOUS MACHINES

ABSTRACT

The synchronous machines in power systems have the excitation systems of field winding to improve the transient stability of power systems. The synchronous machines are nonlinear systems, however, the excitation systems have been designed based on linearized systems, because the stability analysis of nonlinear systems is difficult and the generalized control method of nonlinear systems has not been developed yet.

This paper proposes a nonlinear excitation controller for synchronous machines in power systems. For the sake of simplification of the nonlinear state feedback control, this paper considers both the transient stability and the suppression of the rotor swings in transient conditions. The effect of the automatic voltage regulator (AVR) for the synchronous generator is not discussed here. This controller is designed based on Lyapunov's direct method that can directly judge the stability of nonlinear systems. The usefulness and validity of the proposed excitation controller are confirmed by numerical simulations and experiments. The microprocessor based generator excitation system that consists of a nonlinear controller, state variable detector, and PWM inverter, is constructed. The nonlinear excitation controller can improve the transient stability of synchronous machines.