KSD1-08
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其中 1 和 2 的擾動響應曲線類似，因為兩者的擾動是沿整個過熱器長度方向上同時發(fā)生的，響應具有自平衡特性，而且慣性和遲延都比較小。
對于第 3 種擾動考慮到使控制系統(tǒng)結構簡單，易于實現(xiàn)，目前大多采用噴水量作為調節(jié)量，因此噴水量擾動就是基本擾動。過熱器是具有分布參數(shù)的對象，可以把管內的蒸汽和金屬管壁看作是無窮多個單容對象串聯(lián)組成的多容對象，因此過熱器出口溫度對噴水量擾動的響應有很大的遲延，減溫器離過熱器出口越遠，遲延越大。
2 、通常的汽溫控制系統(tǒng)
通常采用兩種方法對汽溫系統(tǒng)進行控制即帶有導前微分信號的雙信號汽溫控制系統(tǒng)和汽溫串級控制系統(tǒng)，另外還可以增加相位補償回路或前饋控制回路，提高控制系統(tǒng)的品質。在工程實際應用中我們?yōu)榭朔Ｒ?guī)控制策略的不足，根據(jù)對象的特性選用了新型控制方法，自抗擾控制方法。
3 、自抗擾控制器介紹
自抗擾控制器的結構 (Auto-Disturbances-Rejection Controller- ADRC)
自抗擾控制器 (ADRC) 基本結構是由如下三種功能組合而成 :
用一個跟蹤微分器 (TD) 來安排過渡過程并提取其微分信號；
用擴張狀態(tài)觀測器 (ESO) 來估計對象的狀態(tài)變量和未知擾動的實時作用量；
安排的過渡過程與對象狀態(tài)估計量之間誤差的適當非線性組合和未知擾動估計量的補償來生成控制信號。
The disturbance response curves of 1 and 2 are similar because they occur simultaneously along the whole length direction of the superheater, and the response has the characteristics of self balance, and the inertia and delay are relatively small.
For the third disturbance, the control system structure is simple and easy to realize. At present, most of the water spraying amount is used as the regulating quantity, so the water spraying quantity disturbance is the basic disturbance. Superheater is an b with distributed beters. Steam and bl tube wall in the tube can be regarded as a multi volume b composed of infinite single volume bs in series. Therefore, the response of superheater outlet temperature to water spray disturbance has a great delay. The farther the desuperheater is from the superheater outlet, the greater the delay is.
2. Common steam temperature control system
Generally, two bs are used to control the steam temperature system, i.e. double signal steam temperature control system with leading differential signal and steam temperature cascade control system. In addition, phase compensation loop or feed-forward control loop can be added to improve the quality of the control system. In engineering application, in order to overcome the shortcomings of conventional control strategy, according to the characteristics of the b, a new control b, active disturbance rejection control b, is selected.
3. Introduction of ADRC
Structure of auto disturbances rejection controller (ADRC)
The basic structure of active disturbance rejection controller (ADRC) is composed of the following three functions:
A tracking differentiator (TD) is used to arrange the transition process and extract the differential signal;
Extended state observer (ESO) is used to estimate the real-time b of state variables and unknown disturbances;
The appropriate nonlinear combination of the errors between the scheduled transition process and the plant state estimator and the compensation of the unknown disturbance estimator are used to generate the control signal.
KSD1-08
KSD1-08
1756-N2
1756-N2
1756-N2
1756-N2
1756-N2
1756-OB8
1756-PA75R
1756-PA75R
1756-PA75R
1756-TBCH
1756-TBCH
1756-TBCH
1756-TBCH
1756-TBCH
1756-TBNH
1756-TBNH
1756-TBNH
1756-TBNH
1756-TBNH
1756-TBNH
1756-TBNH
KSD1-08
