本文選題：蓄能機(jī)組 + 工況轉(zhuǎn)換�。� 參考：《中國(guó)水利水電科學(xué)研究院學(xué)報(bào)》2017年05期

【摘要】：抽水蓄能機(jī)組無(wú)葉區(qū)壓力脈動(dòng)是機(jī)組及廠房振動(dòng)的重要振源之一,尤其在工況轉(zhuǎn)換過(guò)程中對(duì)廠房及機(jī)組振動(dòng)起到?jīng)Q定性作用。考慮到工況轉(zhuǎn)換過(guò)程屬于典型的非穩(wěn)態(tài)時(shí)變過(guò)程,本文采用時(shí)域混頻幅值方法與時(shí)頻分析中的短時(shí)傅里葉分析方法對(duì)抽水方向調(diào)相轉(zhuǎn)抽水與發(fā)電方向調(diào)相轉(zhuǎn)發(fā)電過(guò)程中無(wú)葉區(qū)壓力信號(hào)進(jìn)行了分析。研究結(jié)果表明:工況轉(zhuǎn)換時(shí)無(wú)葉區(qū)水環(huán)吸收功率受球閥工作密封投退影響,工作密封退出后至頂蓋排氣閥關(guān)閉前時(shí)間段內(nèi)吸入功率恒定,不受排氣回水過(guò)程影響。工況轉(zhuǎn)換時(shí),因密封退出導(dǎo)致水環(huán)增厚,惡化了無(wú)葉區(qū)壓力脈動(dòng)情況。抽水方向調(diào)相至抽水工況轉(zhuǎn)換與發(fā)電方向調(diào)相至發(fā)電工況轉(zhuǎn)換時(shí),無(wú)葉區(qū)壓力脈動(dòng)分別在轉(zhuǎn)輪造壓過(guò)程中和小負(fù)荷區(qū)達(dá)到最大值。工況轉(zhuǎn)換過(guò)程中,無(wú)葉區(qū)存在明顯的動(dòng)靜干涉頻率和一倍葉片過(guò)流頻率。一倍葉片過(guò)流頻率均起源于球閥密封退出瞬間,抽水方向調(diào)相轉(zhuǎn)抽水時(shí)動(dòng)靜干涉頻率起源于尾水與轉(zhuǎn)輪接觸時(shí),而發(fā)電方向調(diào)相轉(zhuǎn)發(fā)電時(shí)動(dòng)靜干涉頻率與一倍葉片過(guò)流頻率同時(shí)產(chǎn)生。
[Abstract]:The pressure pulsation in impeller zone of pumped storage unit is one of the important vibration sources of unit and powerhouse, especially in the process of changing working conditions, it plays a decisive role in the vibration of power house and unit.Considering that the transition process is a typical unsteady-state time-varying process,In this paper, the time-domain mixing amplitude method and the short-time Fourier analysis method in time-frequency analysis are used to analyze the leafless pressure signals in the process of pumping direction phase modulation and generation direction phase modulation.The results show that the absorption power of the water ring in the leafless zone is affected by the ball valve working seal during the working condition transition, and the suction power is constant during the period from the working seal exit to the top cover exhaust valve closing, and is not affected by the exhaust backwater process.The pressure pulsation in the leafless area is aggravated by the thickening of the water ring due to the exit of the seal.When the pumping direction from phase modulation to pumping condition is changed and the generation direction from phase modulation to generation condition, the pressure pulsation in the leafless zone reaches the maximum value in the rotary wheel pressure generation process and in the small load area, respectively.In the process of operating transition, there are obvious static and static interference frequency and double blade overcurrent frequency in the leafless region.The over flow frequency of the double blade originates from the exit moment of the ball valve seal, and the frequency of the static and static interference when the pumping direction is adjusted and the pump is transferred to the pump originates from the contact between the tail water and the runner.However, the frequency of static and static interference and the frequency of double blade overcurrent are generated simultaneously when the direction of power generation is adjusted to generate electricity.
【作者單位】： 中國(guó)水利水電科學(xué)研究院信息中心;國(guó)網(wǎng)新源控股有限公司技術(shù)中心;
【基金】：國(guó)家電網(wǎng)公司科技項(xiàng)目(52573016001G) 國(guó)家自然科學(xué)基金項(xiàng)目(51309258)
【分類號(hào)】：TV734;TV743

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