Performance Analysis of New Main Protection Scheme for Rotor Winding of Variable Speed Pumped Storage Units

doi:10.11930/j.issn.1004-9649.202402020

Abstract

Abstract:

The operation of Fengning variable speed pumped storage units has made the main protection scheme of the rotor winding a hot issue. The multi-loop analysis method is used to simulate all possible internal faults in the rotor winding of the 12 kW AC excitation dynamic simulation electrical machine manufactured by Xiangtan Electrical Manufacturing Factory. Based on this, the performance of a new main protection scheme for the rotor winding based on stator branch harmonic circulation is analyzed, and the types of faults that the main protection scheme for the new rotor winding cannot operate are further clarified and corresponding improvement measures are proposed, which can provide a reference for the stable operation of the variable speed pumped storage units in the future domestic demonstration projects in China.

Key words: variable speed pumped storage unit, rotor winding internal short circuit fault, multi-loop analysis method, harmonic analysis, main protection design

Jianing BAI, Lin GUI, Miao LIU, Yanjun LI, Chenguang GAO, Tianzhi CAO, Yian YAN. Performance Analysis of New Main Protection Scheme for Rotor Winding of Variable Speed Pumped Storage Units[J]. Electric Power, 2024, 57(10): 208-217.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.202402020

https://www.electricpower.com.cn/EN/Y2024/V57/I10/208

Figures/Tables 15

Table 1 Basic parameters of the dynamic simulation electrical machine

参数	定子	转子
槽数	54	45
绕组形式	双层叠绕组	双层叠绕组
极对数	3	3
并联支路数	3	1
每分支串联线圈数	6	15
节距	8	7
额定相电流/A	15.79	5.65
额定功率/kW	12	/
额定电压/V	380	/

Fig.1 Schematic diagram of stator winding and transverse differential protection configuration for the dynamic simulation electrical machine

Fig.2 Rotor winding taps of the dynamic simulation electrical machine

Fig.3 Operation characteristics of the new main protection for the rotor winding

Table 2 Setting value of the new main protection scheme on the dynamic simulation electrical machine

保护定值		数值
裂相横差电流判据的启动电流定值(p.u.)		0.20
裂相横差电流判据的比率制动斜率		0.05
裂相横差电流判据的延时定值/s		0.10
零序横差电流判据的启动电流定值/A		0.10
零序横差电流判据的比率制动斜率		0.20
零序横差电流判据的延时定值/s		0.10

Table 3 Number and distribution of faults that the new main protection scheme cannot operate when rotor winding internal short circuit faults of the dynamic simulation electrical machine occur

故障类型	同槽故障		端部故障
	同相同分支匝间短路		同相同分支匝间短路		相间短路（两短路点间相隔匝数）
	1匝	14匝	1匝	2匝	相隔0匝	相隔1匝	相隔13匝	相隔15匝
不能动作的故障数	15	1	9	1	2	5	1	1

Table 4 Number and distribution of faults that the rotor overcurrent protection cannot operate when rotor winding internal short circuit faults of the dynamic simulation electrical machine occur

故障类型	同槽故障			端部故障
	同相同分支匝间短路		相间短路	同相同分支匝间短路		相间短路
	1匝	3匝	相间短路	1匝	2匝	相间短路
不能动作的故障数	15	15	4	9	15	90

Fig.4 Time domain waveforms of rotor phase currents and stator branch currents when the 2 nd to 15 th turns of the rotor U-phase winding are short circuited

Fig.5 Total effective harmonic values of stator transverse differential currents when the 2 nd to 15 th turns of the rotor U-phase winding are short circuited

Fig.6 Over-limit flags of the new main protection scheme when the 2 nd to 15 th turns of the rotor U-phase winding are short circuited

Fig.7 Effective harmonic values of rotor phase currents when the 2 nd to 15 th turns of the rotor U-phase winding are short circuited

Fig.8 Time domain waveforms of rotor phase currents and stator branch currents when the 15 th turn of the U-phase to the 2 nd turn of the W-phase of the rotor are short circuited

Fig.9 Total effective harmonic values of stator transverse differential currents when the 15 th turn of the U-phase to the 2 nd turn of the W-phase of the rotor are short circuited

Fig.10 Over-limit flags of the new main protection scheme when the 15 th turn of the U-phase to the 2 nd turn of the W-phase of the rotor are short circuited

Fig.11 Effective harmonic values of rotor phase currents when the 15 th turn of the U-phase to the 2 nd turn of the W-phase of the rotor are short circuited

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