Measurement System for Starting Characteristic

 of Large Blower

ZHAO Huaijun¹  DU Zhensheng²  QIU Zongming²  LÜ Xiaopeng³

(1. College of Automation, Northwestern Polytechnical University, Xi’an 710072;
2. School of Mechanical & Instrumental Engineering, Xi’an University of Technology, Xi’an 710048;
3. Shaanxi Blower (Group) Co., Ltd, Xi’an 710600)

Abstract: In order to solve the shortage of the measurement for large blower starting characteristic by experience formulas, a novel indirect measurement method based on measuring the electrical parameters and speed of the blower’s drive motor is presented. The revolving transformation of coordinate is used to measure the driving torque resulted from the positive sequence currents and the braking torque resulted from the negative sequence currents. The impacts of the three-phase unbalanced voltages and the three-phase unbalanced winding of the motor are eliminated. The measurement system is designed based on TMS320F2812 digital signal proc-essor (DSP). The principle and hardware structure of the system are analyzed, and the related software algorithm is programmed. The results of simulations and fieldwork show that the method is practical and feasible, and is apt to be realized, the measurement system is precise and stable, and is hardly affected by the machine vibration, pollution and noise on the worksite.

Key words: Large blower  Starting characteristic  Digital signal processor I ndirect measurement

CLC No: TP273.5

Received 20070726, 20080130

References

[1] SILVA S M, CARDOSO FILHO B J, CARDOSO M M G, et al. Blower drive system based on synchronous motor with solid salient-pole rotor: performance under starting and voltage sag conditions[J]. IEEE Transaction of Industry Applications, 2003, 39(5): 1 429-1 435.
[2] LU Zhihou. Starting process of power station blower[J]. Power Station Auxiliaries, 2002(4): 26-32.
[3] QIU Arui. Motor and electric power drive[M]. Beijing: Publishing House of Electronics Industry, 2002.
[4] WANG Zhaoan, YANG Jun, LIU Jinjun. Harmonic suppression and reactive power compensation[M]. Beijing: China Machine Press, 1998.
[5] MA Li, ZHOU Jinghai, LÜ Zhengyu, et al. An improved harmonic detecting approach based on dq rotating coordination transformation[J]. Journal of Chinese Electrical Engineering Science, 2000, 20(10): 55-63.
[6] MA Daming, ZHU Dongqi, GAO Jingde. Accurate detection for harmonics and reactive current in the case of unsymmetrical three-phase voltages[J]. Journal of Tsinghua University (Sci. & Tech.), 1997, 37(4): 7-10.
[7] FU Xudong, XU Bing, XUE Bichun, et al. Digital detecting of motor’s rotation speed[J]. Control Engineering of China, 2003, 10(2): 186-189.
[8] ZHAO Huaijun, MA Peng, FU Weiping, et al. Design of measurement & control system for blast fan test station based on CAN and PLC[J]. Measurement & Control Technology, 2006, 25(6): 72-75.