Abstract
This paper designs an intelligent energy management control for a stand alone smart DC- micro-grid using super twisting fractional order method. Based on mathematical model of the micro-grid, controllers are derived for the source side converters such as photovoltaic (PV),wind, AC grid and battery management system, and load side converters. Based on the available measured input and consumed output power, an intelligent energy management algorithm decides the appropriate mode of operation for the source and load side converters controller. All DC loads connected to the micro-grid are treated as essential loads and no load shedding can be allowed by the energy management unit. The energy management unit prioritizes the renewable energy sources (PV and wind) in order to make the micro-grid as cost effective. The performance of the proposed control scheme is compared with the integer order controller and the system is simulated in MATLAB/SIMULINK environment for different test cases.
Highlights
In order to meet the raising power demands of the communities around the globe, generation from traditional power sources is no more a viable choice due to the emission of green house gases and the environmental problems [1]
Overall the simulation results are focused on the verification of energy management unit (Figure 6) using the proposed control scheme.In the first case, fixed direct current (DC) load of 8000 watts is connected through two load side converters to the DC voltage bus and state of charge (SOC) for battery storage system is initially set to 80 %
In this work, a generalized nonlinear model of a DC micro-grid converters system is developed to formulate the proposed controller.All DC loads connected to the micro-grid are treated as essential loads and no load-shedding can be allowed by the energy management unit
Summary
In order to meet the raising power demands of the communities around the globe, generation from traditional power sources is no more a viable choice due to the emission of green house gases and the environmental problems [1]. The literature reported in [24]–[29] offer several limitations such as lack of rigorous stability analysis in case of H ∞ method, poor performance of droop control based methods with several sources integrated together, chattering problem in sliding mode control method, small operating envelop in VOLUME 8, 2020 case of general linearization method. 5: In the reported back-stepping control methods for DC micro-grids, the inner loop current references are set by the outer voltage loops, while the proposed sliding surfaces offer flexibility in adjusting the reference currents from user input or from energy management unit in a convenient way.
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