Proceedings ArticleDOI
On design of a robust controller to mitigate CPL effect — A DC micro-grid application
Suresh Singh,Deepak Fulwani +1 more
- pp 448-454
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TLDR
In this article, a sliding-mode controller with a non-linear sliding surface is proposed to ensure large signal stability in DC micro-grid, which is able to mitigate CPL effect of tightly regulated POLs and ensure stable operation of DC microgrid under various disturbances.Abstract:
It has been an established fact that the presence of Constant Power Load (CPL) in DC micro-grid causes instability as it has negative impedance characteristic. This poses a serious challenge for the stability of the DC micro-grid in spite of ensuring stability of individual converters. Some efforts are made by the community to address the issue. In this paper, we have proposed a sliding-mode controller with a non-linear sliding surface to ensure large signal stability. The proposed non-linear surface ensures that constant power is maintained by the converter. The proposed controller is able to mitigate CPL effect of tightly regulated POLs and ensures stable operation of DC micro-grid under various disturbances. Proposed controller is implemented on a typical DC micro-grid feeding a CPL. The theoretical development is verified through simulations in MATLAB Simulink environment.read more
Citations
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Journal ArticleDOI
Robust sliding-mode control of dc/dc boost converter feeding a constant power load
TL;DR: In this article, a robust pulse-width modulation-based sliding-mode controller for a dc/dc boost converter feeding the CPL in a typical dc microgrid scenario is proposed which ensures constant power to be delivered to the load.
Journal ArticleDOI
Constant power loads and their effects in DC distributed power systems: A review
TL;DR: In this paper, the authors present state-of-the-art and research needs in dc distributed power systems in one article, and a review of stability criteria used to study the stability of dc power systems are reviewed with their merits and limitations.
Journal ArticleDOI
Numerical Approximation of the Maximum Power Consumption in DC-MGs With CPLs via an SDP Model
TL;DR: This brief addresses the numerical approximation of the maximum power consumption in direct-current microgrids (DC-MGs) with constant power loads through a convex optimizing model through a semidefinite programming model.
Journal ArticleDOI
Sliding Mode Controller and Lyapunov Redesign Controller to Improve Microgrid Stability: A Comparative Analysis with CPL Power Variation
Eklas Hossain,Ronald A. Perez,Sanjeevikumar Padmanaban,Lucian Mihet-Popa,Frede Blaabjerg,Vigna K. Ramachandaramurthy +5 more
TL;DR: In this paper, a storage based load side compensation technique is used to enhance stability of micro-grids, and two nonlinear control techniques, Sliding Mode Controller (SMC) and Lyapunov Redesign Controller (LRC), are individually implemented to control microgrid system stability with desired robustness.
Proceedings ArticleDOI
Constant power loads: A solution using sliding mode control
Suresh Singh,Deepak Fulwani +1 more
TL;DR: A sliding-mode controller with a non-linear sliding surface to mitigate negative impedance instabilities caused by the CPLs in dc distribution systems (dc Micro-grids) and ensures stable operation of dc micro-grid system under various disturbances is proposed.
References
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Proceedings ArticleDOI
Analysis of boundary control for boost and buck-boost converters in distributed power architectures with constant-power loads
TL;DR: It is shown that first-order switching surfaces with negative slopes achieve large signal stability for both converter systems, while positive slopes lead to instability, and Lyapunov's direct method is used to identify stable reflective regions that guarantee sliding-mode operation towards the desired operating point for both converters.
Proceedings ArticleDOI
A stabilization method for DC networks with constant-power loads
Maria Stefania Carmeli,Denis Forlani,Samuele Grillo,Roberto Pinetti,Enrico Ragaini,E. Tironi +5 more
TL;DR: In this paper, the problem of DC power system stability is addressed and two solutions are proposed and compared, one exploits the insertion of a suitably sized capacitor in parallel to the constant-power converter, while the other makes use of a storage system controlled through a PI regulator.
Proceedings ArticleDOI
Global behaviour analysis of a DC-DC boost power converter operating with constant power load
TL;DR: This paper addresses the closed-loop behaviour of a boost power converter feeding a constant power load in DC-DC converters feeding power converters tightly regulated in multi-converter power electronic systems.
Proceedings ArticleDOI
A robust tracking controller for uncertain MIMO plant using non-linear sliding surface
TL;DR: In this article, a non-linear sliding surface is proposed by which the damping ratio of closed loop system is increased as output approaches setpoint, and a new control law is designed to guarantee the existence of sliding mode around the proposed nonlinear surface.
Proceedings ArticleDOI
Power Electronic Loads with Negative Differential Impedance in a Low Voltage Distribution System
TL;DR: In this article, the authors discuss the negative differential impedance (NDI) effect that power supplies can bring, and their effect on voltage stability, and discuss the power factor corrector front-end.