在电力系统中，无功功率是影响电网稳定的一个重要因素，它关系到整个电力系统能否安全稳定的运行，无功补偿是保证电力系统高效可靠运行的有效措施之一。基于国内电力市场的需求现状，考虑到无功补偿的实现条件和经济适应性，研制出了一种基于DSP TMS320LF2407A控制的TSC型低压动态无功补偿装置。该装置以实时的电网监测数据为依据，以低压网的最佳无功补偿为对象。 本文主要研究了TSC无功补偿的基本原理，无功补偿的控制方式和原理，以及控制器的软、硬件的设计。在硬件设计方面，由DSP TMS320LF2407A作为主控制器，能够实现自动采样计算、无功自动调节、故障保护、数据存储等功能，具有比传统的单片机控制运算速度高，实时性好的特点。采用晶闸管控制投切电容器，完全实现了电容器的快速，无弧，无冲击投切，具有优良的性能。在软件上，采用C语言和汇编语言混合编程，遵循模块化设计原则，提高了系统的通用性和维护的简易程度。在投切原则上，与常见的功率因数控制方案相比较，采用电压无功复合控制，避免了轻载投切振荡，使无功调节更为合理。为了实现装置应具有的功能，本文设计并制作了较为完整的控制电路及其外围设备的硬件电路。它们包括触发电路、采样电路及通讯电路等。文中设计编写了整个控制系统的控制程序，给出了控制软件的结构框图。在本文中，还设计了电容器保护电路，以及装置在电网谐波含量超标时采取的保护措施。实验结果表明，本装置软硬件设计合理，控制方法可行，系统运行可靠，达到了预期的目的。

Reactive power is an important factor to the voltage stability, and it is also related to secure and steady operation of the electric power systems. Reactive power compensation is one of the potent methods of maintaining the effective and reliable operation of the electric power system. A DSP（Digital Signal Processor）controlled Thyristor Switched Capacitor（TSC）system is designed based on TMS320LF2407A for the present electrical power market. This device’s working theory is based on the real-time data of the power network and its intention is to complete the most felicitous compensation for the reactive power which exists in the 220V electric network. The paper mainly includes the followed parts: the principle of the TSC, the control method and principle of reactive power compensation device and the hardware and software design of the device. In hardware design, TMS320LF2407A DSP is used in the controller, which carries out the function such as sampling and calculating, regulating the reactive power automatically, giving protection in case of faults, data saving etc. The device has many merits such as high operating speed and high real-time. The thyristor is adopted as switch to connect capacitors to main circuit, which actualizes the capacitor’s speediness, no arc, no impact switching, and has superior performance. The C and assemble languages are both used in the software design, and the method of modularization is used which can improve the universal trait of the program and simplify the device’s maintenance. Mention of switching law, control method considering reactive power, comparing with familiar control method considering power factor, avoids oscillation on the condition of light loading. In order to realize system’s required function, this paper designs and realizes comparatively integrate microcomputer controlled circuit and its peripherals circuit, including triggering circuit, sampling circuit, displaying circuit and communication circuit. The whole controlling program of the system is designed, and the controlling software structure flow chart is given as well. This paper also designs the protection circuit of the capacitor, and the protect measurement in the condition of high harmonic on the power network. Experiment results reveal that both the hardware and the software are of reasonable design, the control method is feasible and the system runs reliably. The device can realize the function anticipated.