Loop-Cancellation Technique: A Novel Nonlinear Feedback to Overcome the Destabilizing Effect of Constant-Power Loads
Loop-Cancellation Technique: A Novel Nonlinear Feedback to Overcome the Destabilizing Effect of Constant-Power Loads
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DOI：
10.1109/tvt.2009.2037429
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发表时间：
2010-02
影响因子：
6.8
通讯作者：
A. Rahimi;G. Williamson;A. Emadi
中科院分区：
文献类型：
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作者：
A. Rahimi;G. Williamson;A. Emadi
当用作负载时，严格调节的闭环转换器是有问题的，因为它们往往会产生恒定的功率并表现出负增量电阻。这种负电阻导致馈线系统的稳定性问题，无论是输入滤波器还是另一个转换器。在多变换器电力电子系统中，包括电动、混合动力、插电式混合动力和燃料电池汽车等不同的陆地、海上、空中和太空飞行器，存在由其他变换器负载的多个变换器。因此，被称为恒功率负载的负载变流器的不稳定效应是一个主要问题。本文介绍了一种新的非线性反馈，即环路抵消。该技术用于消除恒功率负载的不稳定效应。理论上，任何数量的恒功率负载都可以通过这种技术进行补偿，并且可以在不同类型的转换器上相同地实现。PSpice仿真和实验结果验证了该方法的有效性。
Tightly regulated closed-loop converters are problematic when used as a load since they tend to draw constant power and exhibit negative incremental resistance. This negative resistance causes stability problems for the feeder system, whether it is an input filter or another converter. In multiconverter power electronic systems, which exist in different land, sea, air, and space vehicles, including electric, hybrid, plug-in hybrid, and fuel-cell vehicles, there are many converters loaded by other converters. Therefore, the destabilizing effect of the load converters, which are called constant-power loads, is a major issue. In this paper, a novel nonlinear feedback, which is called loop cancellation, is introduced. This technique is used to cancel the destabilizing effect of the constant-power loads. Theoretically, any amount of constant-power load can be compensated by this technique, and it can identically be implemented on different types of converters. The effectiveness of the proposed technique has been verified by PSpice simulations and experimental results.