【摘要】：在我國(guó)電源結(jié)構(gòu)中,供熱機(jī)組占據(jù)很大比例,特別是在寒冷供熱季節(jié),黑龍江、吉林、遼寧、蒙東、蒙西、寧夏等省級(jí)電網(wǎng)幾乎完全依靠供熱機(jī)組提供調(diào)峰調(diào)頻能力,供熱機(jī)組的“以熱定電”運(yùn)行方式,不僅僅限制了機(jī)組的調(diào)峰范圍,也在很大程度上限制了機(jī)組響應(yīng)動(dòng)態(tài)負(fù)荷指令的能力。事實(shí)上,在北方地區(qū)缺乏水電、燃?xì)獾染哂锌焖僬{(diào)頻能力機(jī)組的前提下,提高供熱工況下響應(yīng)負(fù)荷指令和一次調(diào)頻指令的性能,對(duì)電網(wǎng)安全穩(wěn)定性顯得尤為重要。前期研究表明,城市供熱熱網(wǎng)具有很大的儲(chǔ)能,合理利用這部分儲(chǔ)能,可大幅度提高機(jī)組響應(yīng)發(fā)電負(fù)荷的能力,并且不對(duì)熱用戶(hù)造成可察覺(jué)的影響。但對(duì)供熱熱網(wǎng)儲(chǔ)能容量的定量分析、供熱機(jī)組對(duì)象建模及特性分析、控制系統(tǒng)優(yōu)化設(shè)計(jì)的研究還有待進(jìn)一步深入,圍繞以上問(wèn)題,開(kāi)展以下工作:(1)儲(chǔ)能容量的定量計(jì)算。屏棄了利用熱網(wǎng)傳熱介質(zhì)比熱容計(jì)算儲(chǔ)能容量的方法,提出了依據(jù)傳熱介質(zhì)、管道、熱交換器的熱慣性計(jì)算儲(chǔ)能容量的方法。(2)對(duì)供熱機(jī)組的關(guān)鍵執(zhí)行機(jī)構(gòu),汽輪機(jī)低壓缸進(jìn)汽流量調(diào)節(jié)蝶閥(LV)、汽輪機(jī)供熱抽汽流量調(diào)節(jié)蝶閥(EV)進(jìn)行開(kāi)度-流量非線性特性擬合,并設(shè)計(jì)增益補(bǔ)償控制邏輯。(3)完善了供熱機(jī)組的簡(jiǎn)化非線性動(dòng)態(tài)模型,將純凝機(jī)組燃料量-汽輪機(jī)高壓缸進(jìn)汽調(diào)節(jié)閥開(kāi)度對(duì)汽輪機(jī)前蒸汽壓力-發(fā)電負(fù)荷雙入雙出模型改進(jìn)為供熱機(jī)組燃料量-汽輪機(jī)高壓缸進(jìn)汽調(diào)節(jié)閥開(kāi)度-LV開(kāi)度-EV開(kāi)度-熱網(wǎng)循環(huán)水流量-熱網(wǎng)循環(huán)水回水溫度對(duì)汽輪機(jī)前蒸汽壓力-發(fā)電負(fù)荷-供熱抽汽壓力-供熱抽汽流量六入四出模型。(4)設(shè)計(jì)了能夠充分利用熱網(wǎng)儲(chǔ)能實(shí)現(xiàn)高速率變負(fù)荷的供熱機(jī)組協(xié)調(diào)控制系統(tǒng),該系統(tǒng)能夠在純凝工況下和供熱工況下進(jìn)行無(wú)擾切換。上述研究成果應(yīng)用于LPS熱電廠1號(hào)、2號(hào)機(jī)組快速變負(fù)荷控制系統(tǒng)優(yōu)化項(xiàng)目中,實(shí)際系統(tǒng)已經(jīng)在一個(gè)供熱季內(nèi)連續(xù)投入運(yùn)行。供熱工況下機(jī)組發(fā)電負(fù)荷響應(yīng)速率由1%額定發(fā)電負(fù)荷每分鐘提高到3%~4%額定發(fā)電負(fù)荷每分鐘,蒸汽壓力、燃料量、汽溫波動(dòng)幅度明顯減小。論文工作進(jìn)一步完善了供熱機(jī)組快速變負(fù)荷控制方面的基礎(chǔ)理論和工程技術(shù)。
[Abstract]:In China's power supply structure, heating units occupy a large proportion, especially in the cold heating season, Heilongjiang, Jilin, Liaoning, Mengdong, Mengxi, Ningxia and other provincial power grids almost entirely rely on heating units to provide peak-shaving and frequency-modulation capacity. The operation mode of heat supply unit not only limits the range of peak shaving, but also limits the ability of unit to respond to dynamic load instruction to a great extent. In fact, it is very important for the safety and stability of power network to improve the performance of response load instruction and primary frequency regulation instruction under heating condition under the premise of lack of hydropower, gas and other units with fast frequency modulation ability in the north of China. The previous research shows that the urban heat supply network has a large amount of energy storage. Reasonable utilization of this part of energy storage can greatly improve the capacity of generating units to respond to power generation load, and does not cause perceptible influence on thermal users. However, the quantitative analysis of the energy storage capacity of the heating network, the modeling and characteristic analysis of the heating unit object, and the optimization design of the control system need to be further studied. Based on the above problems, the following work is carried out: (1) quantitative calculation of the energy storage capacity. The method of calculating energy storage capacity based on thermal inertia of heat transfer medium, pipeline and heat exchanger is put forward. (2) the key executive mechanism of heat supply unit is given, and the method of calculating energy storage capacity based on heat transfer medium specific heat capacity of heat transfer network is dispensed with. Steam Turbine low pressure cylinder intake flow Control Butterfly (LV), Steam Turbine heating and extraction flow regulating Butterfly Valve (EV) for opening-flow non-linear characteristics fitting, The gain compensation control logic is designed. (3) the simplified nonlinear dynamic model of heating unit is improved. Improvement of fuel quantity of pure condensing unit-opening of steam inlet throttle valve of steam turbine high pressure cylinder to double in / out model of steam pressure-generating load of steam turbine as fuel quantity of heating unit-opening of steam inlet throttle valve of steam turbine high pressure cylinder-LV opening -EV opening-heat network circulating water flow-heat network circulating water return water temperature to steam turbine front steam pressure-generation load-heating extraction pressure-heating extraction steam flow six-in-four-out model is designed. (4) A six-in-four-out model is designed to make full use of heat. The coordinated control system of heat supply unit with high speed and variable load can be realized by network energy storage. The system can be switched undisturbed under pure condensation and heating conditions. The above research results have been applied to the optimization project of the rapid variable load control system for units 1 and 2 in LPS thermal power plant. The actual system has been put into operation continuously in one heating season. Under heating condition, the response rate of generating load increases from 1% rated generation load per minute to 3% ~ 4% rated generation load per minute, and the fluctuation of steam pressure, fuel quantity and steam temperature decreases obviously. In this paper, the basic theory and engineering technology of rapid variable load control of heating units are further improved.
【學(xué)位授予單位】：華北電力大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：TM621

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 晉宏楊;孫宏斌;郭慶來(lái);陳潤(rùn)澤;李正爍;;含大規(guī)模儲(chǔ)熱的光熱電站—風(fēng)電聯(lián)合系統(tǒng)多日自調(diào)度方法[J];電力系統(tǒng)自動(dòng)化;2016年11期

2 張舒鎧;劉鑫屏;;一種非線性濾波器的設(shè)計(jì)[J];廣東電力;2016年05期

3 劉衛(wèi)東;石清;;我國(guó)區(qū)域產(chǎn)業(yè)轉(zhuǎn)移對(duì)電力需求空間結(jié)構(gòu)傳導(dǎo)效應(yīng)分析——以工業(yè)為例[J];華北電力大學(xué)學(xué)報(bào)(社會(huì)科學(xué)版);2016年02期

4 鄧拓宇;田亮;劉吉臻;;供熱機(jī)組負(fù)荷指令多尺度前饋協(xié)調(diào)控制方案[J];熱力發(fā)電;2016年03期

5 曾名劭;陳健輝;;700MW超臨界火電機(jī)組協(xié)調(diào)控制系統(tǒng)優(yōu)化[J];能源研究與管理;2016年01期

6 章勇敏;劉雯雯;;可再生能源發(fā)電政策分析及建議[J];環(huán)境保護(hù);2016年05期

7 趙書(shū)強(qiáng);王揚(yáng);徐巖;殷加s，

本文編號(hào)：2452832