Arrushi J - Academia.edu (original) (raw)
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Papers by Arrushi J
—This paper describes photovoltaic (PV) module ar-chitectures with parallel-connected submodule-i... more —This paper describes photovoltaic (PV) module ar-chitectures with parallel-connected submodule-integrated dc–dc converters (subMICs) that improve efficiency of energy capture in the presence of partial shading or other mismatch conditions. The subMICs are bidirectional isolated dc–dc converters capable of injecting or subtracting currents to balance the module sub-string voltages. When no mismatches are present, the subMICs are simply shut down, resulting in zero insertion losses. It is shown that the objective of minimum subMIC power processing can be solved as a linear programming problem. A simple close-to-optimal distributed control approach is presented that allows autonomous subMIC control without the need for a central controller or any communication among the subMICs. Furthermore, the proposed control approach is well suited for an isolated-port architecture, which yields additional practical advantages including reduced subMIC power and voltage ratings. The architectures and the control approach are validated by simulations and experimental results using three bidirectional flyback subMICs attached to a standard 180-W, 72-cell PV module, yielding greater than 98% module-level power processing efficiency for a mismatch less than 25%. Index Terms—DC–DC converters, differential power processing , distributed maximum power point tracking, maximum power point tracking (MPPT), modeling and control of power electronics, photovoltaic (PV) modules, renewable energy systems, submodule-integrated dc–dc converters (subMICs).
Drafts by Arrushi J
As a result of advances in solid-state power electronics, DC power distribution has found widespr... more As a result of advances in solid-state power electronics, DC power distribution has found widespread usage due to its advantages. DC/DC converters, which are mainly used for voltage regulation, are fundamental components of DC power distribution systems. This paper presents a peak power controlled DC/DC converter design based on a two-layer hierarchical closed-loop control strategy for active DC power management. The proposed DC/DC converter design, called a power regulated DC/DC driver, limits output power according to current-voltage characteristic of a modified sigmoid function and it allows more secure and controllable power delivery in DC distribution buses. As a design example, we illustrate use of these DC/DC drivers in an active power distribution management application for electric vehicles. The MATLAB/Simulink simulation environment was used for the design and simulation of the proposed DC power distribution system. Simulation results indicate that the active power distribution management system composed of the power regulated DC/DC driver nodes can allow more reliable power distribution for electric vehicles.
—This paper describes photovoltaic (PV) module ar-chitectures with parallel-connected submodule-i... more —This paper describes photovoltaic (PV) module ar-chitectures with parallel-connected submodule-integrated dc–dc converters (subMICs) that improve efficiency of energy capture in the presence of partial shading or other mismatch conditions. The subMICs are bidirectional isolated dc–dc converters capable of injecting or subtracting currents to balance the module sub-string voltages. When no mismatches are present, the subMICs are simply shut down, resulting in zero insertion losses. It is shown that the objective of minimum subMIC power processing can be solved as a linear programming problem. A simple close-to-optimal distributed control approach is presented that allows autonomous subMIC control without the need for a central controller or any communication among the subMICs. Furthermore, the proposed control approach is well suited for an isolated-port architecture, which yields additional practical advantages including reduced subMIC power and voltage ratings. The architectures and the control approach are validated by simulations and experimental results using three bidirectional flyback subMICs attached to a standard 180-W, 72-cell PV module, yielding greater than 98% module-level power processing efficiency for a mismatch less than 25%. Index Terms—DC–DC converters, differential power processing , distributed maximum power point tracking, maximum power point tracking (MPPT), modeling and control of power electronics, photovoltaic (PV) modules, renewable energy systems, submodule-integrated dc–dc converters (subMICs).
As a result of advances in solid-state power electronics, DC power distribution has found widespr... more As a result of advances in solid-state power electronics, DC power distribution has found widespread usage due to its advantages. DC/DC converters, which are mainly used for voltage regulation, are fundamental components of DC power distribution systems. This paper presents a peak power controlled DC/DC converter design based on a two-layer hierarchical closed-loop control strategy for active DC power management. The proposed DC/DC converter design, called a power regulated DC/DC driver, limits output power according to current-voltage characteristic of a modified sigmoid function and it allows more secure and controllable power delivery in DC distribution buses. As a design example, we illustrate use of these DC/DC drivers in an active power distribution management application for electric vehicles. The MATLAB/Simulink simulation environment was used for the design and simulation of the proposed DC power distribution system. Simulation results indicate that the active power distribution management system composed of the power regulated DC/DC driver nodes can allow more reliable power distribution for electric vehicles.