Abstract
The propagation of hybrid power systems (solar–diesel–battery) has led to the development of new energy management system (EMS) strategies for the effective management of all power generation technologies related to hybrid microgrids. This paper proposes two novel EMS strategies for isolated hybrid microgrids, highlighting their strengths and weaknesses using simulations. The proposed strategies are different from the EMS strategies reported thus far in the literature because the former enable the real-time operation of the hybrid microgrid, which always guarantees the correct operation of a microgrid. The priority EMS strategy works by assigning a priority order, while the optimal EMS strategy is based on an optimization criterion, which is set as the minimum marginal cost in this case. The results have been obtained using MATLAB/Simulink to verify and compare the effectiveness of the proposed strategies, through a dynamic microgrid model to simulate the conditions of a real-time operation. The differences in the EMS strategies as well as their individual strengths and weaknesses, are presented and discussed. The results show that the proposed EMS strategies can manage the system operation under different scenarios and help power system operator obtain the optimal operation schemes of the microgrid.
Highlights
Isolated hybrid microgrids plays a key role for reducing the cost of energy in remote areas without a good grid infrastructure [1,2]
StrateTghieesr.esults in the Table 3 show that the optimal energy management system (EMS) strategy allows a higher penetration of renewable energy due to a better adjustment of the charging and discharging of TthabelBe E3.SRSe, swuhltsicwhirthedaucccuems uthlaeteddievsaelul egse.neration of the diesel gensets, because of the cost of energy minimiza1tiYoena.rOSinmtuhleatiootnher hand, the priorityPrEioMriStysEtMraStegy proOdputicme aal EsMligShtly worse result, not tEhnaetrgfyarTofrtaolm(kWthhe)optimal EM7,S17s9t,r0a5t2egy, leading7,1to79a,05s2lightly smallerPpVepnleatnrtation of renewEnaebrlgeyeFnienragl y(k, Wthhe)reby increas6i,n52g5,t1h8e0diesel gene6r,a78ti3o,8n7,0which in turn results in a slightly highEexrcecsoss(tkoWfhe)nergy
Two novel EMS strategies were developed for an isolated hybrid microgrid that run online using aTdoytanlaCmosictsmoficErnoegrrgiyd(m€)odel, that simulates3t,h22e6c,0o2n9ditions of a3r,1e8a5l,1t4im9 e operation
Summary
Isolated hybrid microgrids plays a key role for reducing the cost of energy in remote areas without a good grid infrastructure [1,2]. If a PV array is shaded and power from the solar power plant drops, a BESS takes over the grid and supplies electricity until one or more diesel gensets are fully ramped up This advanced concept allows gensets to be switched off during peak irradiation and increases the penetration of renewable energy in hybrid microgrids. Most of the proposed EMS strategies in the literature are based on off-line applications as they have not been developed with specifications for the microgrid operation in real-time, neither considering the dynamic behavior of the microgrid. Off-line applications are not representative of a real operation since the constant flow of data required to update the status of the generators in short periods of time is only available in a real-time operation In this way, the EMS must be support real-time control of the electric power grid.
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