南方电网技术
南方電網技術
남방전망기술
SOUTHERN POWER SYSTEM TECHNOLOGY
2013年
1期
28-31
,共4页
采样频率%奈奎斯特采样定理%参数辨识%自适应控制%数字控制
採樣頻率%奈奎斯特採樣定理%參數辨識%自適應控製%數字控製
채양빈솔%내규사특채양정리%삼수변식%자괄응공제%수자공제
sampling frequencies%Nyquist’s theorem%parameter identifications%adaptive controls%digital controls
85年前奈奎斯特给出了采样频率的下限,在参数辨识和自适应控制的实践中又知道采样频率高会造成应用失败,得出一些经验公式.推导出采样频率上限,其与 S 域的允许误差成正比、与 Z 域栅格成反比,并图解了其原理.指出采样频率上限不高、很容易超过,这点应当在应用中引起足够重视,并给出了提高采样频率上限的方法,从而为参数辨识、自适应控制和数字控制打下较好的基础.
85年前奈奎斯特給齣瞭採樣頻率的下限,在參數辨識和自適應控製的實踐中又知道採樣頻率高會造成應用失敗,得齣一些經驗公式.推導齣採樣頻率上限,其與 S 域的允許誤差成正比、與 Z 域柵格成反比,併圖解瞭其原理.指齣採樣頻率上限不高、很容易超過,這點應噹在應用中引起足夠重視,併給齣瞭提高採樣頻率上限的方法,從而為參數辨識、自適應控製和數字控製打下較好的基礎.
85년전내규사특급출료채양빈솔적하한,재삼수변식화자괄응공제적실천중우지도채양빈솔고회조성응용실패,득출일사경험공식.추도출채양빈솔상한,기여 S 역적윤허오차성정비、여 Z 역책격성반비,병도해료기원리.지출채양빈솔상한불고、흔용역초과,저점응당재응용중인기족구중시,병급출료제고채양빈솔상한적방법,종이위삼수변식、자괄응공제화수자공제타하교호적기출.
The lower limits of sampling frequencies were given by Nyquist 85 years ago, and several empirical formulae were obtained for the parameter identification and self-adaptation control in practice as it was known that the application would be failure if sampling frequencies being too high. This paper deduces theoretically the upper limits of sampling frequencies. They are proportional to the permissible errors of S space, and inversely proportional to the grids of Z space, and their principles are illustrated. It proves that the upper limits of sampling frequencies are not so high that they are easier to be over. Methods are given to rise the upper limits as to provide better basis for the parameter identification, adaptive control and digital control.
