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摘 要
本文通过介绍发电机同期并网的基本原理和同期并网的基本方式，从原理上对准同期并网的三个条件：压差、频差和相差进行分析，提出了并网所需注意的问题。在此基础上，结合本课题的研究背景，给出了准同期并网系统的设计方案，并具体从硬件设计、软件设计两方面对系统设计作了详细说明。另外由于同期并网在整个电力系统运行过程中仅有很短的时间需要用到，所以在完成准同期并网功能的同时，系统增加了在非并网时期的测速功能。
准同期并网系统的软、硬件皆采用模块化的设计思想，从功能上模块化。硬件设计上，核心处理部分采用TI公司的TMS320F206 DSP芯片，外围电路部分可分为输入和输出部分，并且具有良好的交互界面。输入部分从功能上分为：压差输入（AD转换输入）、频差输入（方波整步电压）、交互输入（键盘输入）和各DI控制量等；输出部分则包括并网部分DO输出量、测速部分DO输出量和显示输出等。在软件设计上，首先分为并网和测速两大功能模块。而在并网模块中又细化为频差处理模块，压差处理模块，合闸输出模块。频差处理模块中又包含了增速脉冲子程序和减速脉冲子程序；压差处理模块中则包含了升压脉冲子程序和降压脉冲子程序。
关键词：准同期并网 压差 频差 导前时间 整步电压
Abstract
The dissertation gives a special research on the generator’s incorporated into the power networks. Firstly, it introduces the basic principle and the usual method of the grid connection .Secondly ,it introduces the three conditions ,such as voltage difference , frequency difference and phase difference ,which we must accord with in order to connect to the networks perfectly. By discussing the background of the subject ,it then shows the the blue print of designing a grid connection system and describes it in detail from hardware and software. Because the work of connect the generator to the power networks only need a little of time , we also use the system to measure the rotational speed of the generator .
The thought of modular designing is adopt in the design of the hardware and software. In the hardware structure design, we use the DSP chips of TMS320F206 as the processing core while the periphery circuit may be divided into two sect无忧论文 【http://www.uklunwen.com】ions, input
section and output section. The voltage difference input circuit ,the frequency difference input circuit ,keyboard input and some DI input make up the input section. The DO output of the grid connection and the speed measuring, the display output make up the output section. In the software structure design, we divide
it into grid connection subprogram and speed measuring subprogram. The grid connection is made up of voltage difference handle subprogram, frequency difference
handle subprogram and the floodgate shut output subprogram. The frequency difference handle subprogram includes the speed-up subprogram and the speed-down
subprogram while the voltage difference handle subprogram includes the voltage-up
subprogram an the voltage-down subprogram.
Key words: Incorporated into the power networks in the same term；
Voltage difference； Frequency difference；Leading time；
Voltage of whole step |
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