云南水電機組功頻控制中有功功率振蕩的預防研究
發(fā)布時間：2019-06-15 05:48
【摘要】：隨著經濟的不斷發(fā)展和社會的不斷進步，電力系統(tǒng)的穩(wěn)定性變得越來越重要，低頻振蕩作為威脅電網安全運行的主要因素之一時時刻刻都有可能發(fā)生。機組的功頻控制中有功功率振蕩是引起電力系統(tǒng)低頻振蕩的主要原因之一，針對機組側的功率振蕩，云南電網已經實施了機組低頻振蕩的實時監(jiān)測與解列保護裝置，但是針對機組側的功率振蕩預防的研究還屬于空白。 本課題依托于云南電網公司科技項目《云南水火電機組功率振蕩的預防與解除研究》，選擇云南水電機組為研究對象，針對云南水電站的水頭季節(jié)性變動大、導葉開度非線性等問題展開了研究。首先，，基于水輪機的相似理論與運動相似率分析推導出了工作水頭與水輪機組有功功率之間的關系，在理想的水輪機組模型的基礎上引入水頭變動干擾，仿真驗證了水頭變動對水輪機組有功功率調節(jié)品質的影響；其次，通過動態(tài)試驗擬合出存在導葉開度非線性水輪機組的導葉開度與機組有功功率之間的函數關系，在理想模型基礎上引入了此函數關系，仿真驗證了開度非線性存在導致不同開度范圍的水輪機組有功功率調節(jié)品質變差的結論；最后，針對存在振蕩隱患的水輪機組分別在工程應用上和理論研究上提出了改進的控制方案。工程上基于自適應控制策略分別提出了水頭自適應控制方案與導葉開度自適應控制策略，并建模仿真驗證了改進控制方案的合理性；在理論研究層面提出基于二次性能指標的單神經自適應PID控制算法，通過與經典PID控制效果進行對比，驗證了單神經元自適應PID在水輪機組有功功率調節(jié)振蕩預防中應用的可行性。 通過本課題的研究，減小了云南水電站由于季節(jié)性水頭變動大和導葉開度非線性對水輪機組有功功率調節(jié)品質的影響，從而保證云南水電機組運行的穩(wěn)定性以及云南電網的運行穩(wěn)定與安全。
[Abstract]:With the continuous development of economy and the continuous progress of society, the stability of power system becomes more and more important. Low frequency oscillation, as one of the main factors threatening the safe operation of power grid, may occur all the time. The active power oscillation in the power and frequency control of the unit is one of the main causes of the low frequency oscillation in the power system. Aiming at the power oscillation on the unit side, Yunnan Power Grid has implemented the real-time monitoring and de-listing protection device of the low frequency oscillation of the unit, but the research on the prevention of the power oscillation on the unit side is still blank. Based on the scientific and technological project of Yunnan Power Grid Company, "Research on the Prevention and removal of Power oscillations of Water and Thermal Power Units in Yunnan", this paper selects Yunnan hydropower units as the research object, and studies the problems of seasonal variation of water head and nonlinear opening of guide vane of Yunnan Hydropower Station. Firstly, based on the similarity theory of hydraulic turbine and the analysis of motion similarity rate, the relationship between the working head and the active power of hydraulic turbine is deduced. On the basis of the ideal hydraulic turbine model, the disturbance of head variation is introduced, and the influence of head change on the active power regulation quality of hydroturbine is verified by simulation. Secondly, the functional relationship between the guide vane opening and the active power of the hydraulic turbine unit with nonlinear opening of the guide vane is fitted by dynamic test, and the function relation is introduced on the basis of the ideal model, and the conclusion that the nonlinear opening leads to the deterioration of the active power regulation quality of the hydroturbine unit with different opening ranges is verified by simulation. Finally, an improved control scheme is proposed in engineering application and theoretical research for hydroturbine units with potential oscillations. Based on the adaptive control strategy, the water head adaptive control scheme and the guide vane opening adaptive control strategy are proposed respectively, and the rationality of the improved control scheme is verified by simulation. At the level of theoretical research, a single neural adaptive PID control algorithm based on quadratic performance index is proposed. Compared with the classical PID control effect, the feasibility of single neuron adaptive PID in the prevention of active power regulation oscillations of hydroturbine units is verified. Through the research of this subject, the influence of seasonal water head variation and nonlinear guide vane opening on the active power regulation quality of water turbine units is reduced, so as to ensure the operation stability of Yunnan hydropower units and the operation stability and safety of Yunnan power grid.
【學位授予單位】：華北電力大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TV734
本文編號：2500010
[Abstract]:With the continuous development of economy and the continuous progress of society, the stability of power system becomes more and more important. Low frequency oscillation, as one of the main factors threatening the safe operation of power grid, may occur all the time. The active power oscillation in the power and frequency control of the unit is one of the main causes of the low frequency oscillation in the power system. Aiming at the power oscillation on the unit side, Yunnan Power Grid has implemented the real-time monitoring and de-listing protection device of the low frequency oscillation of the unit, but the research on the prevention of the power oscillation on the unit side is still blank. Based on the scientific and technological project of Yunnan Power Grid Company, "Research on the Prevention and removal of Power oscillations of Water and Thermal Power Units in Yunnan", this paper selects Yunnan hydropower units as the research object, and studies the problems of seasonal variation of water head and nonlinear opening of guide vane of Yunnan Hydropower Station. Firstly, based on the similarity theory of hydraulic turbine and the analysis of motion similarity rate, the relationship between the working head and the active power of hydraulic turbine is deduced. On the basis of the ideal hydraulic turbine model, the disturbance of head variation is introduced, and the influence of head change on the active power regulation quality of hydroturbine is verified by simulation. Secondly, the functional relationship between the guide vane opening and the active power of the hydraulic turbine unit with nonlinear opening of the guide vane is fitted by dynamic test, and the function relation is introduced on the basis of the ideal model, and the conclusion that the nonlinear opening leads to the deterioration of the active power regulation quality of the hydroturbine unit with different opening ranges is verified by simulation. Finally, an improved control scheme is proposed in engineering application and theoretical research for hydroturbine units with potential oscillations. Based on the adaptive control strategy, the water head adaptive control scheme and the guide vane opening adaptive control strategy are proposed respectively, and the rationality of the improved control scheme is verified by simulation. At the level of theoretical research, a single neural adaptive PID control algorithm based on quadratic performance index is proposed. Compared with the classical PID control effect, the feasibility of single neuron adaptive PID in the prevention of active power regulation oscillations of hydroturbine units is verified. Through the research of this subject, the influence of seasonal water head variation and nonlinear guide vane opening on the active power regulation quality of water turbine units is reduced, so as to ensure the operation stability of Yunnan hydropower units and the operation stability and safety of Yunnan power grid.
【學位授予單位】：華北電力大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TV734
【參考文獻】
相關期刊論文 前10條
1 韓志勇;徐衍會;辛建波;賀仁睦;薄博;;水輪機組與電網耦合對電網動態(tài)穩(wěn)定的影響[J];電工技術學報;2009年09期
2 曾繁玲;;基于小波分析水輪機導葉開度的自適應控制研究[J];大電機技術;2012年03期
3 閆紅霞;;maxDNA分散控制系統(tǒng)在電廠DCS系統(tǒng)改造中的應用[J];電腦知識與技術(學術交流);2007年15期
4 李丹;蘇為民;張晶;王蓓;高洵;田云峰;吳濤;賈琳;苗友忠;許曉菲;李勝;藍海波;雷為民;;“9.1”內蒙古西部電網振蕩的仿真研究[J];電網技術;2006年06期
5 盧勇;劉友寬;孫鵬;杜朝波;;用于系統(tǒng)分析的機組調速系統(tǒng)及其原動機建模問題研究[J];電網技術;2007年S2期
6 劉益劍;水輪機組調節(jié)的模糊控制算法研究[J];南京師范大學學報(工程技術版);2005年01期
7 徐廣文;張海麗;;電力系統(tǒng)穩(wěn)定分析用水輪機調節(jié)系統(tǒng)模型[J];水電廠自動化;2011年04期
8 秦勇;李衛(wèi)平;張春麗;李咸善;;水輪機及其調速系統(tǒng)在單機無窮大系統(tǒng)低頻振蕩中的作用[J];水力發(fā)電;2006年08期
9 秦文萍;徐紅利;;“9.1”蒙西電網機組低頻振蕩現(xiàn)象分析[J];太原理工大學學報;2007年01期
10 姜勝;陳啟卷;蔡維由;;水輪機調速器參數仿真尋優(yōu)策略[J];中國電機工程學報;2008年03期
本文編號：2500010
本文鏈接：http://www.sikaile.net/kejilunwen/shuiwenshuili/2500010.html
最近更新
教材專著
