数字化电力电压测量信号放大系统研究  

Research on digital signal amplifier in power voltage measurement system

作　　者：王东[1] 吴为麟[1] 

机构地区：[1]浙江大学电气工程学院,浙江杭州310027

出　　处：《浙江大学学报（工学版）》2005年第8期1160-1163,共4页Journal of Zhejiang University：Engineering Science

摘　　要：在基于电容式电压互感器(CVT)的电力系统电压测量中CVT二次侧的带负载能力弱,导致在大负载时测量不准确.为了解决这一问题,提出一种应用于电压互感器二次测的基于数字信号处理器(DSP)的数字化高精度信号放大系统.采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的高速处理能力,实现了逆变系统的高性能和高精度.数字化逆变器的控制采用TMS320F240芯片来实现,在其软件中采用了用于电流预估计的PI控制算法和电压电流的双环控制.实验给出了输入电压信号和输出放大后电压的比较波形,结果证明了该方法的正确性.The digital high precision signal power amplifier applied in the second winging of capacitive voltage transformer （CVT） for the high AC voltage measurement in power system resolved the intrinsic problem and disadvantage of low load capability of CVT. This digital amplifier consists of a digital inverter that can amplify the sine voltage signal power using a digital signal processor （DSP）. With the high processing ability of DSP, the amplifier achieved high performance and high precision. The digital inverter is controlled by a TMS320F240 DSP chip, which applying the improved digital PI control arithmetic of the current prediction and the double control loops of voltage and current. Comparison of the prototypes of the input voltage signal and the output power amplified voltage signal proved the validity of the proposed techniques.

关 键 词：数字信号处理器 功率放大器 数字化逆变器 

分 类 号：TM451.2[电气工程—电器]