發(fā)布時間：2018-11-06 11:58

【摘要】：隨著變極調(diào)速技術(shù)的發(fā)展，變極調(diào)速技術(shù)在高壓電機的節(jié)能改造中得到了廣泛的應(yīng)用。在北方發(fā)電廠里，由于循環(huán)泵受季節(jié)性溫差的影響，造成了循環(huán)泵效能的浪費。本文對立式濕坑混流泵的工作原理進行研究，從循環(huán)泵電機的調(diào)速入手，在認(rèn)真研究了變極、變頻等五種交流調(diào)速方案的基礎(chǔ)上，結(jié)合循環(huán)泵的工作特點，對五種方案從技術(shù)、造價、建設(shè)、節(jié)能效果上進行對比后，重點研究循環(huán)泵電機的變極調(diào)速方式。本文對三斷路器、單斷路器加就地切換、單斷路器三種變極調(diào)速控制方案進行了研究。同時，在高壓電機在變極改造過程中，由于繞組接線方式的改變，對差流保護的誤動和電機電磁噪音產(chǎn)生進行了分析，并制定了相應(yīng)的應(yīng)對措施。在金橋熱電廠循環(huán)泵電機的雙速改造實例中，從本廠實際出發(fā)，分析了循環(huán)泵采用變極調(diào)速的必要性，在分析對比后，選擇了單斷路器的調(diào)速控制方式，并結(jié)合管路特性曲線和泵的性能曲線，確定了電機雙速改造的速度和極數(shù)，論述了變極調(diào)速比變頻調(diào)速更適合于循環(huán)泵，對高低速電機的定值進行了整定計算。通過汽輪機冷端運行優(yōu)化，制定了雙速電機的運行策略，對雙速電機進行了現(xiàn)場的運行試驗，研制成功了6kV等級的電動機變極調(diào)速系統(tǒng)，該系統(tǒng)可靠穩(wěn)定，經(jīng)濟效益顯著。
[Abstract]:With the development of variable pole speed regulation technology, variable pole speed regulation technology has been widely used in energy saving transformation of high voltage motor. In the north power plant, the circulating pump is wasted because of the seasonal temperature difference. In this paper, the working principle of the opposite wet pit mixed flow pump is studied, starting with the speed regulation of the circulating pump motor, on the basis of the careful study of five AC speed regulation schemes, such as pole-changing and frequency conversion, and combining with the working characteristics of the circulating pump, the paper makes a technical analysis of the five schemes. After comparing the cost, construction and energy-saving effect, the paper focuses on the pole-changing speed regulation of circulating pump motor. In this paper, three kinds of variable pole speed control schemes of three circuit breakers, single circuit breakers and local switching, single circuit breakers are studied. At the same time, the maloperation of differential current protection and the electromagnetic noise of the motor are analyzed during the transformation of high voltage motor in the process of pole changing because of the change of winding connection mode, and the corresponding countermeasures are worked out. In the case of double speed transformation of circulating pump motor in Jinqiao Thermal Power Plant, the necessity of adopting variable pole speed regulation for circulating pump is analyzed from the actual situation of our factory. After analyzing and comparing, the speed regulation control mode of single circuit breaker is selected. Combined with the characteristic curve of pipeline and the performance curve of pump, the speed and pole number of motor's double speed transformation are determined. It is discussed that the variable pole speed regulation is more suitable for circulating pump than frequency conversion speed regulation, and the setting value of high and low speed motor is calculated. Through the operation optimization of the cold end of steam turbine, the operation strategy of the two-speed motor is worked out, and the field operation test of the two-speed motor is carried out, and the 6kV grade motor pole-changing speed regulating system is developed successfully. The system is reliable and stable, and the economic benefit is remarkable.
【學(xué)位授予單位】：華北電力大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TM343;TM621

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本文編號：2314193