Modeling and control of islanded DC microgrid fed by intermittent generating resources

Abstract

In this paper an islanded microgrid fed through the wind and solar energy resources is presented. The power flow within the microgrid is controlled using a Neutral Point Clamped Dual Active Bridge (NPC-DAB) converter. In the proposed dc microgrid, the solar energy source is associated at the low voltage (LV) bus and the wind energy source is connected at the high voltage (HV) bus. A permanent magnet synchronous generator (PMSG) machine is used in wind energy conversion system. The real time solar radiation and wind speed data of Rupangarh, Rajasthan, India is used as an input for renewable energy resource. The NPC-DAB will work as a power electronics juncture for expediting the energy exchange in the islanded DC Microgrid. The proposed closed loop controller based on the capacitor voltage and load voltage will expedite a complete automatic operation of the islanded DC-microgrid considering various load changes. The system is studied without storage element as the automatic control of energy generation and load feeding is carried out by the NPC-DAB, also this makes the scheme cost effective. The optimum duty ratios for NPC-DAB operation are obtained and thus the increased load demand is met. The modeling of PMSG, NPC-DAB and wind energy system is discussed in details in this work. The proposed system is studied in MATLAB/Simulink environment and results are obtained for different load variations. All the wind control parameters, NPC-DAB waveforms, load waveforms are also plotted using MATLAB.

Optimal Allocation of Hybrid Renewable Energy System in Distribution Network using Arithmetic Optimization Algorithm

“…The DG units may be powered by both non-renewable and renewable energy sources. Micro-turbines, internal-combustion, reciprocating engines, fuel cells, and gas turbines are examples of non-renewable energy-based DGs, whereas renewable energy-based DGs include solar PV systems (Kumar and Rathore, 2022), wind turbine systems (Kumar et al, 2023), solar thermal electric systems, small hydro systems, geothermal systems, and biomass systems (Muhtadi et al, 2021). Globally, solar and wind energy are considered the best green energy options for power distribution networks (Das, 2015).…”

Modelling and testing of wind energy fed hybrid battery-supercapacitor energy storage operating in pulsed charging mode

“…The impact of phase shifting modulation schemes on the converter operating efficacy and the reactive power drawn by the DAB is analysed by many researchers (Shao et al, 2019). Under voltage gains different from unity, the above said analysis plays a pertinent role in converter design (Kumar et al, 2023). The DAB comprises of two H- bridges connected through a high frequency transformer, the phase difference between the primary and secondary side voltages is responsible for the power flow (Kumar and Rathore, 2022; Lin and Du, 2015; Singh et al, 2022).…”