数字化电力电压测量信号的高精度放大系统

【作者】 章兴华；

【导师】 吴为麟；

【作者基本信息】 浙江大学 ， 电力系统及其自动化， 2003， 硕士

【摘要】 本文在基于CVT电容式电压互感器的电力系统电压测量现状的基础上，对存在的带负载问题进行了分析，提出了应用于电压互感器二次侧的一种基于DSP的数字化高精度信号放大系统。 该放大系统用数字化逆变器来实现电力系统正弦电压信号功率的放大，利用DSP数字处理器高速的处理能力，可以使系统实现高性能的算法控制，并且能灵活地对系统的误差进行补偿，从而实现逆变系统的高性能和高精度，为解决电力系统电容式互感器二次侧带负载能力弱的问题进行了有意义的研究。 系统中逆变器的控制采用TMS320FL240芯片来实现，在软件中实现了电压电流的双环控制，提出并在逆变中应用了电流预估计的PI控制算法，并对控制死区进行了补偿。前级直流电压由3854芯片控制PFC后的AC／DC提供。最后给出了输入电压信号和放大后输出电压信号的实验比较结果，并研制出了样机。更多还原

【Abstract】 This paper presents a digital high precision signal power amplifier applied in the second winging of CVT for the high AC voltage measure in Power System and analyses the intrinsic problem and disadvantage of CVT applied in power voltage measure system, based on the status in quo of CVT applied in power system.This digital amplifier made up of a digital inverter can implement the sine voltage signal’s power amplifying based on the digital signal processor. With the high processing ability of DSP, the advanced digital control arithmetic can be realized in the software. Also the feasible and effective technique for the time delay compensation of digital control can be achieved. The high capability and precision of the inverter amplifier is a good attempt to resolve the problem which mainly features the little load capability in CVT.The digital inverter amplifier is controlled by the DSP chip TMS320FL240. The high performance of digital voltage and current control loops and the improved digital PI control arithmetic based on the current prediction techniques is achieved in the software. And the dead-time of inverter also is compensated. This digital inverter amplifier’s DC power is supplied by an AC/DC with PFC circuit controlled by 3854. In the end, the experimental conclusion based on the compare prototype of the input voltage signal and the output power amplified voltage signal and a model is presented.更多还原