单相智能电表中电能计量方法的研究

Research on the measurement method of electric energy in single phase intelligent electric meter

如今全球智能电网的发展趋势迅猛,其核心技术也是逐步进步,同时我国政府为了刺激经济,加大力度发展智能电网。智能电表对广大用电消费者的生活非常贴近,其应用技术也在居民中广泛普及。通过智能电网的发展,作为它智能终端的智能电表已相当普及,不同于以往使用的电表,它除了一些基本的电量计算功能,更多为了适用于新能源的发展以及智能电网要求具备了新的智能化功能,如双向数据通信,用户端控制技术,多种费率双向接受计量及防窃电等。主要对单相智能电表对电能的计量方法进行了研究。通过将电压信号和电流信号分别经过高精度模数转换器,由模拟信号转化为数字信号。然后通过高通滤波器和采样滤波器,滤去直流增益与高频噪声,从而得到需要的电压和电流采样数据。将电压和电流数据相乘,可得到瞬时有功功率,经过低通滤波器输出平均有功功率。另外,电压和电流采样数据分别通过平方电路,低通滤波器,开平方电路,可以得到电压和电流的有效值。将有功功率通过时间的积分,还可以获得有功能量。

Nowadays, the development trend of the global smart grid is swift and violent and its core technology is gradually improving. At the same time, the Chinese government devotes develop smart grid in order to stimulate the economy. Smart meters due to is very close to the life of the vast number of consumers living with electricity, so its application technology is also widely popular among residents. Through the development of smart grid, smart meter has been quite popular as its smart terminal. In addition to a number of basic power calculation functions, they have some more new intelligent functions in order to apply to the development of new energy and the requirements of smart grid, which is different from the previous use of the meter, such as bidirectional data communication, the control technology of user side, multiple rate two-way metering and anti power-stolen etc. In this paper, the measurement method of single phase intelligent electric meter is studied. The voltage and current signals transform analog signals to digital signals by means of the high precision analog to digital converter. Then, the signals get through the high pass filter and the sampling filter, filtering out the DC gain and high frequency noise, then they can get the required voltage and current sampling data. After the voltage and current data are multiplied, the instantaneous active power can be obtained,and the average active power output gets through the low pass filter output. In addition, the voltage and current sampling data can get the effective value of voltage and current through the square circuit, low pass filter and square circuit respectively. The active power can be obtained through the integration of time, and the active energy can get.