摘 要 在电力网中，影响电压稳定的一个重要因素是无功功率，它关系到整个电力系统能否安全稳定的运行。而保证电力系统高效可靠运行的有效措施之一是无功功率补偿。本文在分析无功功率补偿原理的基础上，设计了一种FC+TCR型低压无功补偿控制系统。本文主要内容如下： 介绍了无功补偿装置的国内外发展历史及其特点和主要研究方向；论述了TCR型无功补偿装置的基本构成、工作原理及其理想线性模型和常用控制方法并进行了仿真。 在硬件方面，本文主要设计了控制器及其外围电路。外围电路包括电压、电流信号采集电路、低通滤波电路、锁相倍频电路、投切电路、脉冲放大电路、晶闸管保护电路。其中控制器采用DSPTMS320LF2407作为控制芯片，系统充分利用了它速度快、功能强大的特点。 在软件方面本文主要设计了数据采集模块、数据处理模块、触发脉冲形成模块、液晶显示模块。其中重点介绍了FFT算法以及触发脉冲的形成。 本文设计了一套低压无功补偿装置并进行实验。实验结果表明该系统设计合理，所采用的控制方法和控制策略正确、有效，运行稳定可靠，达到了无功补偿指标要求，为更进一步研究打下了基础，具有一定的实用价值。

ABSTRACT In the power grid，reactive Power is an important factor to the voltage stability，and it is also related to secure and steady operation of the power system.Reactive power compensation is one of the potent methods which can maintain effective and reliable operation of the power system.Based on the principle of TCR，a low voltage reactive power compensation system has been designed. The mainly content in this paper is as following: It primarily presents the development, features and main research direction of reaetive power compensation device at home and abroad. and recommends the basic structure of TCR system, working principle, perfect linear model and ordinary control methods.then emulate. In the hardware design，the paper mainly introduces controller and its periphery circuit.It is include Voltage, current signal acquisition circuit, low-pass filter circuit, phase-locked frequency multiplication circuit, threw cutting circuit, pulse amplifying circuit, thyristor protection circuit.The controller using TMS320LF2407DSP as control chip, the system makes full use of its speed and powerful features. In software this article mainly introduced the data acquisition module. FFT data processing algorithm, triggering pulse form module, LCD module. and mainly introduces FFT algorithm and how to form pulse Angle. Designed a set of low voltage reactive compensation device and texted.The experimental results show that the system design is reasonable. the control method and control strategy correctly and effectively, operation is stable and reliable, and achieve reactive power compensation required for further study, lay the foundation, has certain practical value.