本文選題：線性自抗擾控制 + 線性二次型高斯最優(yōu)控制�。� 參考：《華北電力大學(xué)(北京)》2017年碩士論文

【摘要】：現(xiàn)今,風(fēng)能是應(yīng)對(duì)全球能源危機(jī)最為主要的可再生能源之一。近年來(lái)隨著風(fēng)電技術(shù)和規(guī)模的不斷發(fā)展,風(fēng)電場(chǎng)在電力系統(tǒng)中所占比例逐步增大,但由于風(fēng)電輸出功率具有隨機(jī)性和波動(dòng)性,其大規(guī)模并網(wǎng)會(huì)引起電力系統(tǒng)頻率的波動(dòng),從而降低電力系統(tǒng)的頻率控制能力。為保證電力系統(tǒng)的安全性和頻率穩(wěn)定性,針對(duì)大規(guī)模風(fēng)電機(jī)組并網(wǎng)后電力系統(tǒng)的頻率穩(wěn)定問(wèn)題進(jìn)行研究并設(shè)計(jì)能適應(yīng)并抑制系統(tǒng)輸出頻率波動(dòng)的負(fù)荷頻率控制器是十分必要的。線性自抗擾控制器(LADRC)結(jié)構(gòu)簡(jiǎn)單、不依賴(lài)精確數(shù)學(xué)模型和具有較強(qiáng)的適應(yīng)性和魯棒性,但僅用帶寬法進(jìn)行整定,控制器的控制性能會(huì)受到限制。本文在針對(duì)含大規(guī)模風(fēng)電的電力系統(tǒng)負(fù)荷頻率波動(dòng)的LADRC結(jié)構(gòu)和設(shè)計(jì)方面,為提高其抗干擾控制性能,考慮將過(guò)程的復(fù)雜動(dòng)態(tài)加入到LADRC控制結(jié)構(gòu)中,利用被控對(duì)象已知的信息,設(shè)計(jì)了改進(jìn)型的LADRC控制策略,提出了實(shí)際可行的能克服風(fēng)電場(chǎng)負(fù)荷波動(dòng)的頻率控制方案。方案一將風(fēng)電負(fù)荷視為負(fù)荷頻率控制系統(tǒng)的隨機(jī)干擾。利用線性二次型高斯最優(yōu)控制(LQG)對(duì)隨機(jī)干擾抑制效果好的優(yōu)點(diǎn),提出LQG-LADRC兩步法控制器設(shè)計(jì)方案。該方案首先根據(jù)被控對(duì)象模型設(shè)計(jì)了LQG,其次在不改變干擾抑制性能的前提下把設(shè)計(jì)好的LQG轉(zhuǎn)換成LADRC,使得LADRC可以完全實(shí)現(xiàn)LQG的抗干擾性能。這種改進(jìn)方法可以更好地估計(jì)擾動(dòng),能夠更加充分地利用LQG和LADRC各自的優(yōu)點(diǎn),使得LADRC控制器抑制隨機(jī)干擾的能力進(jìn)一步得到提高。方案二將風(fēng)電負(fù)荷視為負(fù)荷頻率控制系統(tǒng)的不確定擾動(dòng)。利用干擾觀測(cè)器(DOB)對(duì)不確定干擾控制效果好的優(yōu)點(diǎn),本文提出了一種DOB-LADRC兩步法控制器設(shè)計(jì)方案。該方案首先設(shè)計(jì)了一個(gè)基于DOB的兩自由度控制系統(tǒng),其次在不改變干擾抑制性能的前提下把設(shè)計(jì)好基于DOB的控制器轉(zhuǎn)換成LADRC,使得LADRC可以完全實(shí)現(xiàn)DOB的抗干擾性能。這種改進(jìn)方案優(yōu)化了含不確定干擾的負(fù)荷頻率系統(tǒng)控制性能,使得風(fēng)電場(chǎng)引起的負(fù)荷頻率波動(dòng)最小化,達(dá)到更好的控制品質(zhì)。最后,本文建立了風(fēng)力機(jī)和電力系統(tǒng)負(fù)荷頻率模型,針對(duì)電力系統(tǒng)中風(fēng)力發(fā)電的干擾,運(yùn)用以上兩種方案進(jìn)行仿真分析。并將所提方案與IMC-PID控制、基于帶寬法整定的LADRC方案進(jìn)行了對(duì)比,從干擾抑制性能和魯棒性能兩個(gè)角度驗(yàn)證了本文所提方案的有效性。
[Abstract]:Nowadays, wind energy is one of the most important renewable energy sources to deal with the global energy crisis. In recent years, with the development of wind power technology and scale, the proportion of wind farm in power system has gradually increased. However, due to the randomness and volatility of wind power output, large-scale grid connection will cause the frequency fluctuation of power system. Thus, the frequency control ability of power system is reduced. In order to ensure the safety and frequency stability of power system, it is necessary to study the frequency stability of power system after large-scale wind turbine is connected to grid and to design a load frequency controller which can adapt and suppress the frequency fluctuation of power system output. The linear active disturbance rejection controller (LADRC) is simple in structure, independent of accurate mathematical model, and has strong adaptability and robustness. However, the control performance of the controller is limited by only tuning by bandwidth method. In this paper, in order to improve the anti-interference control performance of LADRC structure and design of power system load frequency fluctuation with large-scale wind power, the complex dynamic process is considered to be added to the LADRC control structure, and the known information of the controlled object is used. An improved LADRC control strategy is designed, and a feasible frequency control scheme is proposed to overcome the load fluctuation of wind farm. Scheme one regards wind power load as random disturbance of load frequency control system. Based on the advantage of linear quadratic Gao Si optimal control (LQG) for suppressing random interference, a design scheme of LQG-LADRC two-step controller is proposed. Firstly, the LQG is designed according to the controlled object model, and then the designed LQG is transformed into LADRCwithout changing the interference suppression performance, so that LADRC can completely realize the anti-jamming performance of LQG. The improved method can better estimate the disturbance, make full use of the advantages of LQG and LADRC, and further improve the ability of LADRC controller to suppress random interference. The second scheme regards wind power load as uncertain disturbance of load frequency control system. This paper presents a design scheme of DOB-LADRC two-step controller based on the advantages of disturbance observer (DOB) for uncertain disturbance control. Firstly, a two-degree-of-freedom control system based on DOB is designed. Secondly, the controller based on DOB is transformed into LADRC-based controller without changing the performance of interference suppression, so that LADRC can completely realize the anti-jamming performance of DOB. The improved scheme optimizes the control performance of the load frequency system with uncertain disturbance, which minimizes the fluctuation of load frequency caused by wind farm and achieves better control quality. Finally, the load frequency model of wind turbine and power system is established, and the above two schemes are used to simulate and analyze the disturbance of wind power generation in power system. The proposed scheme is compared with the IMC-PID control and the LADRC scheme based on bandwidth tuning. The effectiveness of the proposed scheme is verified from two aspects: interference suppression performance and robust performance.
【學(xué)位授予單位】：華北電力大學(xué)(北京)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：TM712

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 周宏;譚文;;線性自抗擾控制的抗飽和補(bǔ)償措施[J];控制理論與應(yīng)用;2014年11期

2 于哲;王璐;蘇劍波;;基于干擾觀測(cè)器的不確定線性多變量系統(tǒng)控制[J];自動(dòng)化學(xué)報(bào);2014年11期

3 譚文;周宏;傅彩芬;;負(fù)荷頻率控制系統(tǒng)的線性自抗擾控制[J];控制理論與應(yīng)用;2013年12期

4 陳增強(qiáng);孫明瑋;楊瑞光;;線性自抗擾控制器的穩(wěn)定性研究[J];自動(dòng)化學(xué)報(bào);2013年05期

5 席裕庚;李德偉;林姝;;模型預(yù)測(cè)控制——現(xiàn)狀與挑戰(zhàn)[J];自動(dòng)化學(xué)報(bào);2013年03期

6 楊罡;劉明光;屈志堅(jiān);;基于MPC算法的電力系統(tǒng)負(fù)荷頻率控制[J];北京交通大學(xué)學(xué)報(bào);2012年02期

7 韓肖清;董桐宇;程昱舒;王鵬敏;;變速恒頻風(fēng)電機(jī)組的有功-頻率控制[J];電力系統(tǒng)及其自動(dòng)化學(xué)報(bào);2011年06期

8 武小梅;白銀明;文福拴;;基于RBF神經(jīng)元網(wǎng)絡(luò)的風(fēng)電功率短期預(yù)測(cè)[J];電力系統(tǒng)保護(hù)與控制;2011年15期

9 尹正男;蘇劍波;劉艷濤;;基于H_∞范數(shù)優(yōu)化的干擾觀測(cè)器的魯棒設(shè)計(jì)[J];自動(dòng)化學(xué)報(bào);2011年03期

10 范曉旭;白焰;呂躍剛;徐大平;;大型風(fēng)力發(fā)電機(jī)組線性二次型高斯最優(yōu)控制策略[J];中國(guó)電機(jī)工程學(xué)報(bào);2010年20期

相關(guān)會(huì)議論文 前1條

1 賈濤;張文;褚曉東;;AGC平抑風(fēng)電場(chǎng)輸出功率波動(dòng)的仿真分析[A];中國(guó)高等學(xué)校電力系統(tǒng)及其自動(dòng)化專(zhuān)業(yè)第二十四屆學(xué)術(shù)年會(huì)論文集（上冊(cè)）[C];2008年

相關(guān)碩士學(xué)位論文 前2條

1 付婭;含大規(guī)模風(fēng)電的互聯(lián)系統(tǒng)的負(fù)荷頻率控制[D];北京交通大學(xué);2012年

2 張紅俠;時(shí)滯及市場(chǎng)化電力系統(tǒng)的負(fù)荷頻率控制[D];華北電力大學(xué)（北京）;2011年

，

本文編號(hào)：2116559