High Efficiency Valley-fill Battery Discharge Regulator and Conductance Control in Parallel Operation
Bao Zhiyun1, 2, Fu Ming3, Wang Mingyan2
1. Haerbin Institute of Technology Haerbin 150001 China 2. Shenzhen polytechnic Shenzhen 518055 China 3. Shenzhen academy of aerospace technology Shenzhen 518057 China
Abstract:The step-up power stage is usually used in the battery discharge regulator (BDR) which provides energy from the battery to the bus in high-power photovoltaic generation system. The advantages and disadvantages of three step-up power topologies are compared by simulation analysis in this paper, and the valley-fill phase-shift full-bridge power topology is adopted. The dual-loop control converter based on conductance control is proposed to achieve parallel operation of BDR modules, and the compensator of current-sharing accuracy has been designed to improve the current-sharing performance of BDR modules in parallel operation. Excellent dynamic response of the bus is ensured by the external voltage control loop. An example of 1500W BDR module is given in the paper, and the experimental results show that the output current-sharing accuracy is better than 1%, the efficiency of 10% load is 95%, the efficiency of half load is 98.5%, and the efficiency of full load is above 97%. Good static and dynamic performance is achieved by using the parallel control theory and the compensator of current-sharing accuracy, which provides an effective technical approach for the power extension of high-power BDR modules.
鲍志云, 付明, 王明彦. 高效填谷式电池放电变换器及并联控制方法[J]. 电工技术学报, 2011, 26(1增): 15-22.
Bao Zhiyun, Fu Ming, Wang Mingyan. High Efficiency Valley-fill Battery Discharge Regulator and Conductance Control in Parallel Operation. Transactions of China Electrotechnical Society, 2011, 26(1增): 15-22.
[1] Sun Juanjuan. Dynamic performance analyses of current sharing control for DC-DC converters[D]. Virginia Tech, 2007. [2] Panov Y, Jovanovic M M. Stability and dynamic performance of current-sharing control for paralleled voltage regulator modules[J]. IEEE Transaction on Power Electronics, 2002, 2 (17): 172~179. [3] Weinberg A K, Boldo P R. A high power, high frequency, DC-DC converter for space applications[C]. IEEE PESC, 1992:1140-1147. [4] Denzinger W, Dietrich W. Generic 100V high power bus conditioning[C]. Seventh European Space Power Conference, 2005, 5: 9-13. [5] Sudhakar B C. Veerachary M. Predictive valley current control for two inductor boost converter[C].Proceddings of the IEEE International Symposium on Industrial Electronics, 2005: 727-731. [6] ejea J B, Ferreres A, et al. High efficiency battery discharge regulator with parallel power processing[C]. Proceedings of the IEEE Applied Power Electronics Conference, 2005: 204-209. [7] Ejea J B, Ferreres A, Sanchis K E, et al. Optimized topology for high efficiency battery discharge regulator[J]. IEEE Transaction on Aerospace and Electronic System, 2008, 44(4): 1511~1518. [8] MartíJ B W, Kilders E S, Maset E, et al. Stability problems of peak current control at narrow duty cycles[C]. APEC, 2008:1549-1554. [9] Marti J B E, Sanchis E, Maset K, et al. Peak current control instabilities at narrow duty cycles[C]. IEEE PESC, 2008:476-482. [10] Maset E, Ferreres A, Ejea J B, et al. 5kW weinberg converter for battery discharging in high-power communications satellites[C]. IEEE PESC, 2005: 69-75. [11] Sammaljrvi T, Lakhdari F, Karppanen M, et al. Modelling and dynamic characterisation of peak-current-mode-controlled superboost converter[J]. The Institution of Engineering and Technology, 2008, 1(4): 527-536. [12] Laszlo Balogh. The current-doubler rectifier: an alternative rectification technique for push-pull and bridge converters[R]. Texas Instruments Application Note SLUA121. [13] Steve Mappus. Current doubler rectifier offers ripple current cancellation[R]. SLUA323, 2004, 9: Texas Instrument. [14] Techniques to improve ZVS full-bridge performance. Intersil Corporation Application Note[R]. 2006(4)4: N1246. [15] Ridley R B. An accurate and practical small-signal model for current-mode control[J]. Ridley Engineering, 1999. [16] Kutkut N H, Divan D M. An improved full-bridge zero-voltage switching PWM converter using a two- Inductor rectifier[J]. IEEE Transsation Industrial Applicat, 1995, 31(1): 119-126. [17] Kutkut N H, Luckjiff G. Current mode control of a full bridge DC-TO-DC converter with a two inductor rectifier[C]. IEEE PESC, 1997: 203-209. [18] Wei Tang, Fred C L, Raymond B, et al. Small- signal modeling of average current-mode control[J]. IEEE Transactions on power Electronics, 1993, 8(2): 112-118. [19] Vlatko Vlatkovic, Sabate J A, Ridley R B, et al. Small-signal analysis of the phase-shift PWM converter[J]. IEEE Transaction on Power Electronics. 1992, 7(1): 128-135. [20] Hung G K, Chen C L. A simple current-share paralleling technique for peak-current-mode controlled power supplies[C]. IEEE international conference on power electronics and drive systems, 2001, 2(22) : 504- 507. [21] Sullivan D O, Spruyt H, Crausaz A. PWM conductance control[C]. IEEE Power Electronics. Specialists’ Con5 Rec, 1988: 351-359.