A Study on Starting Characteristic and Improvement for High Power Motor with Tunnel Boring Machine

TBM용 대용량 전동기의 기동 특성 및 개선 관한 연구

Abstract

Tunnel Boring Machine's Technology has depends mostly on imports, currently domestic technology development was proceeding. There are many technologies in this field, above all, the large-capacity motor drive technology required for excavation is one of the core technologies. In particular, when several large motors are simultaneously starting, there are many problems due to a large starting current at that time, and it is difficult to design and operate a power receiving facility. In this paper, A method of reducing the starting current by using the regenerative power generated by the deceleration of the motor has been studied. To verify this proposal, we designed the induction motor controller using CAE based power simulation tool and verified the results of the proposed method by applying the reduced model. As a result, it is possible to reduce the maximum starting current and shorten the start-up time. Moreover, even if several motors are connected to one bank, it is proved that the method can be efficiently operated by using the sequential braking / starting sequence. In the case of a power system in which a large capacity electric motor such as a tunnel excavation system is driven, the results of this study are expected to be a stable and effective method for solving the start-up current problem and designing the power receiving facility.

그림 1 기동방식별 전동기 기동전류 특성[2] Fig. 1 Starting current characteristics of motor by startingmethod

그림 2 유도 전동기 속도-토크 곡선 및 제안된 제동-기동 곡선 Fig. 2 Induction motor speed-torque curve and proposedbraking-start curve

그림 3 유도전동기 구동 운전영역 Fig. 3 Operation area of Induction motor drive

그림 4 3상 유도 전동기 구동 인버터 제어 모드 Fig. 4 3-phase induction motor drive inverter control mode

그림 5 저항형 제동 방식 Fig. 5 Resistive braking method

그림 6 전원 회생형 제동 방식 Fig. 6 Power regenerative braking method

그림 7 간접 제어 방식 유도기 2대 구동시스템 설계 Fig. 7 Indirect control type induction machine 2 units drive system design

그림 8 순차기동방식과 회생전력을 이용한 기동방식 해석결과 비교 Fig. 8 Comparison of starting analysis results using sequential start and regenerative power

그림 9 제안하는 방법에 의한 회생전력 이용 기동시 토크 및 전류 특성 Fig. 9 Torque and current characteristics at startup using regenerative power by proposed method

그림 10 제안하는 회생전력을 이용한 기동 방법 4개 모터 제어 시퀀스 Fig. 10 Starting control sequences using the proposed regenerative power for 4-motor

그림 11 4개 모터의 속도지령에 대한 응답 Fig. 11 Response to speed command of 4 motors

그림 12 순차기동법과 회생전력을 이용한 기동법에 의한 기동전류 비교 Fig. 12 Start-up current comparison by using sequential start and regenerative power

표 1 TBM 시스템 전동기별 기동 특성 Table 1 Start-up characteristics of TBM system motor

표 2 농형 유도전동기 제정수 Table 2 Parameters of Squirrel Cage Induction Motor

표 3 기동방법에 따른 결과 분석 Table 3 Comparison analysis of results by starting method