发电厂循环水泵变极调速系统节能研究及应用
发布时间：2018-11-06 11:58
【摘要】：随着变极调速技术的发展，变极调速技术在高压电机的节能改造中得到了广泛的应用。在北方发电厂里，由于循环泵受季节性温差的影响，造成了循环泵效能的浪费。本文对立式湿坑混流泵的工作原理进行研究，从循环泵电机的调速入手，在认真研究了变极、变频等五种交流调速方案的基础上，结合循环泵的工作特点，对五种方案从技术、造价、建设、节能效果上进行对比后，重点研究循环泵电机的变极调速方式。本文对三断路器、单断路器加就地切换、单断路器三种变极调速控制方案进行了研究。同时，在高压电机在变极改造过程中，由于绕组接线方式的改变，对差流保护的误动和电机电磁噪音产生进行了分析，并制定了相应的应对措施。在金桥热电厂循环泵电机的双速改造实例中，从本厂实际出发，分析了循环泵采用变极调速的必要性，在分析对比后，选择了单断路器的调速控制方式，并结合管路特性曲线和泵的性能曲线，确定了电机双速改造的速度和极数，论述了变极调速比变频调速更适合于循环泵，对高低速电机的定值进行了整定计算。通过汽轮机冷端运行优化，制定了双速电机的运行策略，对双速电机进行了现场的运行试验，研制成功了6kV等级的电动机变极调速系统，该系统可靠稳定，经济效益显著。
[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.
【学位授予单位】：华北电力大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM343;TM621
本文编号：2314193
[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.
【学位授予单位】：华北电力大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM343;TM621
【相似文献】
相关期刊论文 前10条
1 曹晓军,常岱华;可编程序控制器控制变极调速系统的应用[J];电子质量;1998年12期
2 曹晓军,常岱华;可编程序控制器控制变极调速系统的应用[J];电子质量;1998年12期
3 李白雅,刘恩义;变极调速电机性能分析的一种新方法[J];防爆电机;2000年03期
4 吕银玲;孔祥海;张晓磊;;塔机起升机构变极调速的原理分析及控制电路的改进[J];中国科技信息;2010年21期
5 李辉;;变极调速技术在起重机上的应用[J];有色矿冶;2012年05期
6 董益林;;泵站大型电动机的变极调速及其控制[J];农田水利与小水电;1992年03期
7 李立强;;单绕组4/8极变极调速电机解析[J];科技信息(学术研究);2008年23期
8 ;产品与设备[J];电气时代;1986年02期
9 吴赛飚;康平;王晓春;;高压变极调速电机的研究[J];防爆电机;2012年05期
10 黄亚军;电动机变极调速应注意的几个问题[J];电工技术杂志;1998年03期
相关硕士学位论文 前1条
1 付建华;发电厂循环水泵变极调速系统节能研究及应用[D];华北电力大学;2014年
，本文编号：2314193
本文链接：https://www.wllwen.com/kejilunwen/dianlilw/2314193.html
教材专著
