航空宽变频交流信号异步采样方法分析

Analysis of asynchronous sampling method for aero wide variable frequency AC power systems

对航空宽变频交流信号的异步采样方法展开研究,首先分析宽变频基波有效值的理论误差,根据有效值理论误差提出了优化的宽变频有效值计算公式,消除了计算方法带来的理论误差;同时,推导了在基波采样频率下谐波有效值理论误差,在优化的计算公式下谐波有效值计算误差为0。最后,在发电机控制器硬件平台上对宽变频范围内异步采样方法的推导进行验证。实验结果验证了误差理论推导及优化计算公式的正确性;在航空宽变频范围内,采用优化有效值计算公式的异步采样方法具有可行性和高采样精度。

An asynchronous sampling method for aero wide variable frequency AC power systems is studied in this paper. According to the error of root mean square(RMS) value analyzed in theory, an optimized formula for RMS calculation is proposed to eliminate the error caused by calculation method. Meanwhile, the theoretical error of RMS of harmonic under the fundamental sampling frequency is deduced to be zero. Finally, the theoretical derivation of asynchronous sampling method in wide variable frequency range is verified experimentally in the generator control unit. The experimental results verify the correction of theoretical error analysis and the optimized formula. Within the aero wide variable frequency range, the asynchronous sampling method using the calculation formula of optimiszed root mean square value has feasibility and high sampling precision.