基于DSP的无功补偿装置的研究与设计

【作者】 李辉；

【导师】 赵光宙；

【作者基本信息】 浙江大学 ， 控制理论与控制工程， 2004， 硕士

【摘要】 针对电力系统中无功补偿装置发展的现状，研制出了一种基于DSP TMS320LF2407控制的低压动态无功补偿装置。作为无功补偿控制器和电网监测器的统一体，该装置以实时的电网监测数据为依据，以城镇低压网(220V)的最佳无功补偿为对象。 本文主要研究了无功补偿对电网性能的改善，无功补偿装置的控制方式及原理，和控制器的软硬件设计。系统硬件上采用了TI公司的16位定点DSP TMS320LF2407控制，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，全数字化控制，全中文液晶显示界面实时显示系统运行状况，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，采用汇编语言编程，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，采用无功功率控制，避免了轻载振荡。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、显示电路及通讯电路等。文中还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，还介绍了电网谐波对补偿装置的影响，以及装置在电网谐波含量超标时采取的保护措施。最后，对无功补偿装置的发展和DSP控制技术的发展进行展望。更多还原

【Abstract】 Contraposing the developmental actuality of reactive power compensation system in power system, a DSP (Digital Signal Processor) controlled Thyristor Switch Capacitors (TSC) system is designed based on TMS320LF2407 for reactive power dynamic compensation. As the combination of reactive power controller and electric power wire’s measurement, this device’s working theory is based on the real-time data of the electric power wire and it’s intention is to complete the most felicitous compensation for the reactive power which exists in the 220V electric power wire.The paper mainly includes the followed parts: the ameliorating of the net’s capability by the reactive power compensation, the control method and principle of reactive power compensation device and the hardware and software design of the device. The device’s hardware core is the 16-bit fix point DSP TMS320LF2407 produced by TI corp., which has many merits such as high operating speed and high real-time. The system adopts thyristor as switch that connect capacitors to main circuit, numeralization control, and Chinese menu LCD screen interface displaying system’s run-time Status momentarily. It actualizes the capacitor’s speediness, no arc, no percussion switching, and has superior performance. The software design adopts the assemble language; we use the method of modularization 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 communicating circuit. It also designs the whole controlling program of the system, and gives the controlling software structure flow chart. This paper also points out the influence of harmonics to the compensation system, and the protect measurement in the condition of high harmonics on the power net. At last, the paper looks into the future of the development of reactive power compensation and the technique of DSP controller.更多还原