贯流式水轮发电机空载电压波形畸变与阻尼条损耗发热抑制

摘要

为改善水轮发电机电能质量,预防阻尼绕组过热,保证机组与电网运行安全,基于电机电磁场、电路及传热学理论,建立了水轮发电机三维分层非线性时变运动电磁场-电路结合模型与磁极系统三维稳态温度场模型.进而针对一台q=1?的36 MW贯流式机组的128种结构设计方案,通过电磁场-温度场综合计算,广泛深入地分析了定转子槽距比、定子斜槽程度以及每极阻尼条根数等结构参数对空载电压波形畸变率和额定工况阻尼绕组损耗发热的影响,在此基础上,讨论了同时抑制空载电压波形畸变率与阻尼绕组损耗发热的设计措施.计算结果与实测数据相吻合.%To improve the power quality of hydro-generator,prevent the overheat of damper bar and ensure the safe operation of the generator unit and the grid,the electromagnetic field theory,the circuit theory and heat transfer theory are used to establish a 3 D multi-slice moving electromagnetic field-circuit coupling model of hydro-generator and a 3D temperature field model of the rotor pole.Then the models are used to calculate 128 structure design schemes of a 36 MW fractional slot tubular hydro-generator( q=1?) ,and the influence of the variation of damper bar pitch,stator slot skewing degree and number of damper bars per pole on the no-load voltage distortion and damper bar loss and heat are analyzed.Furthermore,the op-timized measures are presented and the calculation results are coincident well with the test data.