面向碳中和的冲击性负荷电能实时动态计量方法

Real Time Dynamic Measurement Method of Electric Energy for Impact Load Based on Carbon Neutralization

在面对不同波形时,不同的电能计量方法的误差较大,因此,面向碳中和,设计冲击性负荷电能实时动态计量方法。计算滤波信号系统偏差,在采样周期内,获取离散信号,构建信号移频表达式;建立冲击性负荷电能等效模型,计算电压与电流有效值,分析有功输出功率和无功功率;构建采样点离散频率表达式,计算采样点余数偏差,实时更新电能动态指标。绘制正弦波、平顶波、尖顶波、电流过零点波等四种瞬时功率波形,实例测试结果表明,正弦波的滤波效果远远优于其他三种波形。10 s内四种波形的电能实时动态计量误差累计数值分别为0.082%、0.179%、0.256%和0.401%。电能计量方法对正弦波的计算精度最高,适应性最好。

In the face of different waveforms, the error of different energy measurement methods is large.Therefore, the dynamic measurement method of impact load energy is designed for carbon neutralization.The deviation of the filtering signal system is calculated.In the sampling period, the discrete signal is obtained and the signal frequency shift expression is constructed;The equivalent model of electric energy of impact load is established, the effective values of voltage and current are calculated, and the active output power and reactive power are analyzed;The discrete frequency expression of sampling point is constructed, the residual deviation of sampling point is calculated, and the dynamic index of power is updated in real time.The results of the test show that the filtering effect of sine wave is much better than that of the other three waveforms.The cumulative values of the real-time dynamic measurement errors of the four waveforms in 10 seconds are 0.082%,0.179%,0.256% and 0.401%,respectively.The accuracy of the method is the highest and the adaptability is the best.