Investigation on the performance of a 277.8 MVA synchronous air-cooled hydrogenerator through loss models

2018 International Conference on Power, Instrumentation, Control and Computing (PICC) Pub Date : 1900-01-01 DOI:10.1109/PICC.2018.8384790

Karthik Desingu, T. Chelliah, D. Khare

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引用次数: 1

Abstract

Synchronous generators (SGs) are widely used in power generating plants including hydropower as it is easy to control, supports large amount of reactive power, and offers higher energy efficiency in comparison with asynchronous generators. SGs are often overloaded through hydro-turbines by utilizing excess water flow in the river (e.g. 1000 MW Kancham Wangtoo hydropower station (India) at 20% continuous overloading condition for more than six weeks). This paper investigates the efficiency of a 277.8 MVA SG, through its loss models, under two operating conditions: (i) at rated load, (ii) at 20% overload. Temperature of cooling air inlet to the stator of SG (primary cooling) and the temperature of water inlet to the cooler (secondary cooling) are considered for the analysis. Simulated results are compared with a commissioned generator through the on-site measurements. From the test results, it is observed that the cooler performance (temperature of air leaving from the cooler) was poor at overloads which causes reduction in efficiency and temperature-rise in stator windings of tested SG.

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利用损失模型对277.8 MVA同步风冷水轮发电机的性能进行了研究

同步发电机具有易于控制、支持大量无功功率、比异步发电机具有更高的能效等优点，在包括水电在内的发电厂中得到了广泛的应用。水电站经常通过水轮机超载，利用河流中多余的水流(例如1000兆瓦的Kancham Wangtoo水电站(印度)连续超载20%超过6周)。本文通过损耗模型研究了277.8 MVA SG在两种工况下的效率:(i)额定负载，(ii) 20%过载。分析时考虑了SG定子冷却风入口温度(一次冷却)和冷却器冷却水入口温度(二次冷却)。通过现场测量，将模拟结果与已投产的发电机进行了比较。从试验结果可以看出，冷却器的性能(从冷却器流出的空气温度)在过载时很差，这会导致测试SG的定子绕组效率降低和温升。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2018 International Conference on Power, Instrumentation, Control and Computing (PICC)

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