Abstract：The distributed multi-converter system is a typical application and is more popular in applications such as aircrafts, spacecrafts and also ships. Each single converter module is designed stable. However, in the system level, the stability is still a big issue due to the complex interaction among the power converters. The small signal stability of the cascaded system is deeply studied, while the large signal stability issue in cascade system is still not well addressed. Under the assumption that the load converter works as a constant power load(CPL). This paper analyzes the relationships between parameters of the feeder converter and the stability of the cascaded system. Design criterion is proposed. The maximum CPL value is also derived from the calculation. This value can provide criterion for matching the feeder and the downstream converters. Instead of trial and error, the efficiency of design can be greatly increased.
[1] 钱照明, 张军明, 谢小高, 等. 电力电子系统集成研究进展与现状[J]. 电工技术学报, 2006, 21(3): 1-14. [2] 王建华, 张方华, 龚春英, 等. 带恒功率负载的DC/DC变换器起动过程分析[J]. 电工技术学报, 2009, 24(4): 121-125. [3] Middlebrook R D. Input filter considerations in design and application of switching regulators[C]. Industry Applications Conference, 1976: 91-107. [4] Zhang J M, Xie X G, Jiao D Z, et al. Stability problems and input impedance improvement for cascaded power electronic systems[C]. Proceedings of the Applied Power Electronics Conference and Exposition, 2004: 1018-1024. [5] Robert W, Erickson, Slobodan Cuk, et al. Large- signal modelling and analysis of switching regulators[C]. Proceedings of the Power Electronics Specialists Conference, 1982: 240-250. [6] Khaligh A, Emadi A. Modified pulse adjustment technique with variable states to control DC-DC converters operating in discontinuous conduction mode and driving constant power loads[C]. Proceedings of the IEEE Conference on Industrial Electronics and Applications, 2006. [7] Rivetta C, Williamson G. A Large-signal analysis of a DC-DC Buck power converter operating with constant power load[C]. Proceedings of the IEEE IECON Conference Proceedings, 2003: 732-737. [8] Rivetta C Williamson G A. Global behaviour analysis of a DC-DC boost power converter operating with constant power load[C]. Proceedings of the International Symposium on Circuits and Systems, 2004: 956-959. [9] Rivetta C, Williamson G A, Ali Emadi. Constant power loads and negative impedance instability in sea and undersea vehicles: statement of the problem and comprehensive large-signal solution[C]. Proceedings of the Electric Ship Technologies Symposium, 2005: 313-320. [10] Rivetta C H. Emadi A, Williamson G A, et al. Analysis and control of a Buck DC-DC converter operating with constant power load in sea and undersea vehicles[J]. IEEE Transactions. on Industry Applications, 2006: 559-572. [11] Emadi A, Ehsani M. Negative impedance stabilizing controls for PWM DC-DC converters using feedback linearization techniques[C]. Proceedings of the IEEE Energy Conversion Engineering Conference and Exhibit, 2000: 613-621. [12] Emadi A, Ehsani A. Dynamics and control of multi-converter DC power electronic systems[C]. Proceedings of the Power Electronics Specialists Conference, 2001: 248- 253. [13] Khaligh A, Emadi A. Pulse adjustment, a novel digital control technique, for control of a DC-DC Buck-Boost converter operating in discontinuous conduction mode and driving constant power loads[C]. Proceedings of the Vehicle Power and Propulsion Conference, 2006: 1-5. [14] Khaligh A, Emadi A. Power alignment, new digital control approach for a DC-DC flyback converter with constant power loads[C]. Proceedings of the IEEE Conference on Industrial Electronics and Applications. 2006. [15] Khaligh A, Rahimi A M, Chakraborty A, et al. Analysis and stabilization of a Buck-Boost DC-DC converter feeding constant power loads in parallel with conventional loads in vehicular systems[C]. Proceedings of the IEEE IECON, 2006: 2799-2804. [16] Khaligh A, Emadi A. Mixed DCM/CCM pulse adjustment with constant power loads[J]. IEEE Transactions on Aerospace and Electronic Systems, 2008, 44(2): 766-782. [17] Rahimi A M, Emadi A. An analytical investigation of DC-DC power electronic converters with constant power loads in vehicular power systems[J]. IEEE Transactions on Vehicular Technology, 2009, 58(6): 2689-2702. [18] Rahimi A M, Williamson G A, Emadi A. Loop-cancellation technique: A novel nonlinear feedback to overcome the destabilizing effect of constant-power Loads[J]. IEEE Transactions on Vehicular Technology, 2010, 59(2): 650-661. [19] 王建华, 张方华, 龚春英, 等.带恒功率负载的DC-DC 变换器阶跃响应过程分析[J]. 中国电机工程学报, 2008, 28(30): 7-11. 作者简介:杜韦静 女, 1985年生, 博士研究生, 主要研究方向电力电子系统集成。张军明 男, 1975年出生, 博士, 主要研究方向电力电子系统集成、电源管理及先进电力电子变流技术。
2011, Vol. 26 
