CAJ | 학술논문

针对现有变步长最小均方(LMS)广义谐波电流检测不能消除同频谐波电流和基波无功电流对步长更新的干扰，以及对跃变的系统跟踪能力差的问题，文中提出一种基于箕舌线函数的变步长LMS谐波电流检测算法。该算法采用将当前时刻负载电流减去滤波器输出的误差信号与参考输入信号的瞬时互相关时间均值估计来消除基波无功电流和谐波电流的干扰，并通过改进的箕舌线函数来调节算法的步长，从而在保证动态响应时间不增大的前提下，使算法具有更小的稳态误差，对跃变的系统具有较强的跟踪能力，且其参数的取值对负载电流大小的依赖性较小。计算机仿真结果证实了该方法的有效性。
침대현유변보장최소균방(LMS)엄의해파전류검측불능소제동빈해파전류화기파무공전류대보장경신적간우，이급대약변적계통근종능력차적문제，문중제출일충기우기설선함수적변보장LMS해파전류검측산법。해산법채용장당전시각부재전류감거려파기수출적오차신호여삼고수입신호적순시호상관시간균치고계래소제기파무공전류화해파전류적간우，병통과개진적기설선함수래조절산법적보장，종이재보증동태향응시간불증대적전제하，사산법구유경소적은태오차，대약변적계통구유교강적근종능력，차기삼수적취치대부재전류대소적의뢰성교소。계산궤방진결과증실료해방법적유효성。
In view of the inability of the existing variable-step least mean square(LMS)harmonic current detection to eliminate the interference of the common frequency harmonic current and fundamental reactive current with step update plus the poor tracking ability of the j ump system,a variable-step LMS harmonic current detection algorithm based on the versiera function is proposed.The algorithm eliminates the interference of the fundamental reactive current and harmonic current using the time mean estimate of the instantaneous cross-correlation between the reference input signal and the error signal at the moment which is obtained by subtracting the filter output from the load current.The modified versiera function is used to adj ust the algorithm step,thereby ensuring that the dynamic response time is not increased.This method has not only a smaller steady state error,a better tracking ability of the j ump system,but also its parameter value is less dependent on the size of the load current.Computer simulation results demonstrate the validity of the proposed method.