Abstract：In the closed-loop control program of inverter control, the motor phase current sampling is a core part. In this paper three-phase current measurement using only a single current sensor in the inverter dc link is proposed based on the relationships among the phase current, DC bus current and inverter switch states. It can minimize the number of current sensors, reduce sensor cost, weight, and volume. The new single current sensor algorithm can solve the difficulty in three-phase current reconstruction by space voltage vector phase-shifting. Simulation and experimental results show that the method is effective and correct.
[1] 姜淑忠, 李小海. 电机驱动器中的电流传感器[J]. 电机与控制应用, 2007, 34(6): 29-32. [2] 黄文新, 胡育文. 基于空间矢量调制策略270V高压直流笼型异步发电系统[J].电工技术学报, 2007, 22(1): 22-28. [3] Frede Blaabjerg, John K Pedersen, Ulrik Jaeger, et al. Single current sensor technique in the DC link of three-phase PWM-VS inverters:a review and a novel solution[J]. IEEE Transactions on Industry Applica- tions, 1997, 33(5): 1241-1253. [4] 刘艳, 邵诚. 三相电压源型PWM逆变器相电流重构策略研究[J]. 信息与控制, 2007, 36(4): 506-513. [5] Hongrae Kim, Thomas M Jahns. Phase current reconstruction for AC motor drives using a DC link single current sensor and measurement voltage vectors[J].IEEE Transactions on Power Electronics, 2006, 121( 5):1413-1419 . [6] Woo Cheol Lee, Taeck Kie Lee, Dong Seok Hyun. Comparison of single-sensor current control in the DC link for three-phase voltage-source PWM converters[J]. IEEE Transactions on Industrial Electronics, 2001, 48(3): 491-505. [7] Mognihan J F, Kavanagh R C, Egan M G, et al. Indirect phase current detection for field oriented control of a permanent magnet synchronous motor drive[C]. In Proc. EPE’91, 1991, 3: 641-646. [8] Saritha B, Janakiraman P A. Single sensor current control of permanent magnet synchronous motor using field programmable gate array[J]. IET Electr. Power Appl., 2007, 1(3): 416-422. [9] Bertoluzzo M, Buja G, Menis R. Direct torque control of an induction motor using a single currentsensor[J]. IEEE Transactions on Industrial Electronics, 2006, 53(3): 778-784.
2010, Vol. 25 
