论文部分内容阅读
随着广域测量系统对同步相量测量装置动态性能越来越严格的要求,数字滤波器在装置中的应用趋于复杂。为了提高精度,往往要采用多个滤波器互相配合完成计算。针对智能变电站的同步相量测量装置给出了详细的滤波器设计方案。有限冲激响应(FIR)滤波器级联离散傅里叶变换(DFT)会带来非常大的运算量,给嵌入式装置带来计算压力,为此推导出了FIR滤波器级联DFT后的滤波系数公式。利用该公式离线计算出滤波器级联后的滤波系数,能大幅减少计算量,解决滤波器级联带来的运算量大的问题。理论分析和实际测试表明,采用所述方案后,测量精度能够满足相关标准的要求,且大幅减轻了装置的计算负担。
As wide-area measurement systems have become increasingly stringent on the dynamic performance of synchronized phasor measurement devices, the application of digital filters in devices tends to be complex. In order to improve the accuracy, often use multiple filters to complete the calculation. Aiming at the intelligent phasor measurement device, a detailed filter design is given. Finite impulse response (FIR) filter cascaded discrete Fourier transform (DFT) will bring a very large amount of computational load to bring embedded computing pressure, for which the deduction of the FIR filter cascaded DFT Filter coefficient formula. Using this formula to calculate the filter coefficients of the filter after cascade can greatly reduce the amount of calculation and solve the problem of large amount of calculation caused by the filter cascade. Theoretical analysis and practical tests show that the proposed scheme can meet the requirements of relevant standards and greatly reduce the computational burden of the device.