CAJ | 학술논문

利用AR谱估计给出模型的结构和初始参数，解决了非线性优化算法的参数建模问题，也给出了参数的初值；结合非线性优化算法，克服了AR谱估计不能计算谐波幅值和相位的缺点，且进一步提高了频率的计算准确度。非线性优化算法的设计中，首先选用共轭梯度法对参数初值进行预处理，使之接近全局最优解；随后再使用阻尼最小二乘法能使参数迭代的谐波参数计算值），降低迭代算法对初值的敏感度，提高了迭代稳定性和计算效率； AR谱估计与非线性优化结合方法的参数计算准确度高出加Hanning窗插值法1～4个数量级，且有一定的抗噪能力。结果表明，本系统完全满足电压谐波测试仪的要求，可以完全解决CVT传输特性的复杂问题。
이용AR보고계급출모형적결구화초시삼수，해결료비선성우화산법적삼수건모문제，야급출료삼수적초치；결합비선성우화산법，극복료AR보고계불능계산해파폭치화상위적결점，차진일보제고료빈솔적계산준학도。비선성우화산법적설계중，수선선용공액제도법대삼수초치진행예처리，사지접근전국최우해；수후재사용조니최소이승법능사삼수질대적해파삼수계산치），강저질대산법대초치적민감도，제고료질대은정성화계산효솔； AR보고계여비선성우화결합방법적삼수계산준학도고출가Hanning창삽치법1～4개수량급，차유일정적항조능력。결과표명，본계통완전만족전압해파측시의적요구，가이완전해결CVT전수특성적복잡문제。
this paper, by using AR model spectrum estimation structure and initial parameters, solve the problem of the parametric modeling of nonlinear optimization algorithm, the initial value of parameters is also given Combined with the nonlinear optimization algorithm, overcame the AR spectrum estimation can't calculate harmonic amplitude and phase of the faults, and further improve the calculation accuracy of the frequency.The design of nonlinear optimization algorithm, first choose conjugate gradient method for pre-processing, the parameters of the initial value to make it close to the global optimal solution;Then using the damping least-square method can make the parameter iterative harmonic parameter calculation value) , reduce the sensitivity to initial value of iteration al-gorithm, improves the stability of iteration and calculation efficiency;AR spectrum estimation and optimization of nonlinear combina-tion method of parameter calculation accuracy is higher than the Hanning window interpolation method 1 ~4 orders of magnitude, and have certain ability to resist noise.Results show that the system can completely satisfy the requirements of voltage harmonic test-er, can completely solve the complex problem of CVT transmission characteristics.