SpringerLink Springer Engineering eBooks 2017 English+International

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Preface; Contents; About the Authors; Acronyms; 1 Introduction; 1.1 Constant Power Loads: Sources, Behaviour and Effects; 1.2 Stability of a Simple dc Power System with CPL; 1.3 Small-Signal Stability of Basic DC/DC Converters with CPL; 1.3.1 Buck Converter; 1.3.2 Boost Converter; 1.3.3 Buck-Boost Converter; 1.3.4 Bidirectional Buck-Boost Converter; 1.4 Stability of a DC Microgrid with CPL; 1.5 Review of Literature; 1.5.1 Passive Damping; 1.5.2 Active Damping; 1.5.3 Feedback Linearization; 1.5.4 Pulse Adjustment; 1.5.5 Digital Charge Control; 1.5.6 Sliding Mode Control.

1.5.7 Synergetic Control1.5.8 Passivity Based Control; 1.5.9 Power Shaping Stabilization; 1.5.10 Coupling Based Techniques; 1.5.11 State-Space Pole Placement; 1.5.12 New Converter Topologies; 1.6 Motivation; 1.7 Organization of the Book; References; 2 Stabilization of a Buck Converter Feeding a Mixed Load Using SMC; 2.1 Mathematical Modeling of Buck Converter with Mixed Load; 2.2 Sliding Mode Control Design; 2.2.1 Discontinuous SMC; 2.2.2 PWM Based SMC; 2.2.3 Simulation Studies; 2.2.4 Experimental Validation; 2.3 Summary; References.

3 Mitigation of Destabilizing Effects of CPL in a Boost Converter Feeding Total CPL3.1 Mitigation of CPL Effects in Boost Converter Using SMC; 3.1.1 System Modeling of Boost Converter with CPL; 3.1.2 Design of PWM Based SMC; 3.1.3 Existence of Sliding Mode and Stability of Surface; 3.1.4 Validation of the Proposed Controller; 3.2 Mitigation of CPL Effects Using SMC Designed #x83;; 3.2.1 Modified Switching Function; 3.2.2 Discontinuous SMC Using Modified Switching Function; 3.2.3 Existence of Sliding Mode with Discontinuous SMC; 3.2.4 Stability of Modified Switching Surface.

3.2.5 Real-Time Simulation Studies3.2.6 Experimental Validation of the Proposed SMC; 3.3 Summary; References; 4 Compensation of CPL Effects in a Bidirectional Buck-Boost Converter; 4.1 Compensation of CPL in a Bidirectional DC/DC Converter; 4.1.1 Modeling of Bidirectional DC/DC Converter; 4.1.2 Sliding Mode Control Design; 4.1.3 Real-Time Simulation Studies; 4.2 Summary; References; 5 Robust Control of an Islanded DC Microgrid in Presence of CPL; 5.1 Robust Control of a PV Based DC Microgrid; 5.1.1 Test System and Its Operating Modes; 5.1.2 Mathematical Modeling of Island DC Microgrid.

5.1.3 Sliding Mode Control Design5.1.4 Stability on Switching Surface; 5.1.5 Simulation Studies and Experimental Results; 5.2 Summary; References; Index.

This book focuses on the mitigation of the destabilizing effects introduced by constant power loads (CPLs) in various non-isolated DC/DC converters and island DC microgrids using a robust non-linear sliding mode control (SMC) approach. This book validates theoretical concepts using real-time simulation studies and hardware implementations. Novel sliding mode controllers are proposed to mitigate negative impedance instabilities in DC/DC boost, buck, buck-boost, bidirectional buck-boost converters, and islanded DC microgrids. In each case, the condition for the large-signal stability of the converter feeding a CPL is established. An SMC-based nonlinear control scheme for an islanded DC microgrid feeding CPL dominated load is proposed so as to mitigate the destabilizing effect of CPL and to ensure system stability under various operating conditions. A limit on CPL power is also established to ensure system stability. For all proposed solutions, simulation studies and hardware implementations are provided to validate the effectiveness of the proposed sliding mode controllers.