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IC660ELB921E

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其中 1 和 2 的擾動(dòng)響應(yīng)曲線類似，因?yàn)閮烧叩臄_動(dòng)是沿整個(gè)過(guò)熱器長(zhǎng)度方向上同時(shí)發(fā)生的，響應(yīng)具有自平衡特性，而且慣性和遲延都比較小。
      對(duì)于第 3 種擾動(dòng)考慮到使控制系統(tǒng)結(jié)構(gòu)簡(jiǎn)單，易于實(shí)現(xiàn)，目前大多采用噴水量作為調(diào)節(jié)量，因此噴水量擾動(dòng)就是基本擾動(dòng)。過(guò)熱器是具有分布參數(shù)的對(duì)象，可以把管內(nèi)的蒸汽和金屬管壁看作是無(wú)窮多個(gè)單容對(duì)象串聯(lián)組成的多容對(duì)象，因此過(guò)熱器出口溫度對(duì)噴水量擾動(dòng)的響應(yīng)有很大的遲延，減溫器離過(guò)熱器出口越遠(yuǎn)，遲延越大。
2 、通常的汽溫控制系統(tǒng)
      通常采用兩種方法對(duì)汽溫系統(tǒng)進(jìn)行控制即帶有導(dǎo)前微分信號(hào)的雙信號(hào)汽溫控制系統(tǒng)和汽溫串級(jí)控制系統(tǒng)，另外還可以增加相位補(bǔ)償回路或前饋控制回路，提高控制系統(tǒng)的品質(zhì)。在工程實(shí)際應(yīng)用中我們?yōu)榭朔Ｒ?guī)控制策略的不足，根據(jù)對(duì)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(jié)構(gòu) (Auto-Disturbances-Rejection Controller- ADRC)
自抗擾控制器 (ADRC) 基本結(jié)構(gòu)是由如下三種功能組合而成 :
用一個(gè)跟蹤微分器 (TD) 來(lái)安排過(guò)渡過(guò)程并提取其微分信號(hào)；
用擴(kuò)張狀態(tài)觀測(cè)器 (ESO) 來(lái)估計(jì)對(duì)象的狀態(tài)變量和未知擾動(dòng)的實(shí)時(shí)作用量；
安排的過(guò)渡過(guò)程與對(duì)象狀態(tài)估計(jì)量之間誤差的適當(dāng)非線性組合和未知擾動(dòng)估計(jì)量的補(bǔ)償來(lái)生成控制信號(hào)。

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

IC660ELB921E

IC660ELB921E