摘要
提出了一种电网谐波数字测量新方法,时域多周期同步采样的频域代数运算法,给出该方法实现的具体硬件配置。该方法主要包括时域多周期硬件同步采样和频域叠加运算2个关键环节。多周期同步采样用100 MHz高频脉冲对电网频率进行实时测量跟踪,保证10个周波采样同步偏差小于0.03%;进而对采样信号的矩形窗频谱进行简单的代数运算,可达到加Hanning窗的精度。仿真实验表明,新方法可在每10个周波实现电网谐波的高精度测量,精度满足国标A级标准。
A new method for harmonic measurement in power system is proposed, and the hardware schematic of implementing it is discussed. The proposed method is based on the multi-cycle synchronous sampling and simple algebraic operation in spectrum. The multi-cycle synchronous sampling technique guarantees that the synchronous sampling error with 10 cycles is under 0.03%. Then the harmonic components of the spectrum is obtained by simple algebraic operations, which enjoys the same accuracy as Hanning windowed DFT. The simulation results validate the proposed method, and the accuracy of the proposed method meets the national A-level standards.
出处
《江苏电机工程》
2014年第4期30-33,共4页
Jiangsu Electrical Engineering
关键词
多周期同步采样
谐波测量
加窗傅里叶变换
multi-cycle synchronous sampling technique
Harmonic measurement
windowed DFT
