Abstract
The increasing penetration of renewable generators can be a significant challenge due to the fluctuation of their power generation. Energy storage (ES) units are one solution to improve power supply quality and guarantee system stability. In this paper, a hybrid microgrid is built based on photovoltaic (PV) generator and ES; and coordinated control is proposed and developed to achieve power management in a decentralized manner. This control scheme contains three different droop strategies according to characteristics of PV and ES. First, the modified droop control is proposed for PV, which can take full utilization of renewable energy and avoid regulating output active power frequently. Second, to maintain the direct current (DC) bus voltage stability, a novel droop control incorporating a constant power band is presented for DC-side ES. Third, a cascade droop control is designed for alternating current (AC)-side ES. Thus, the ES lifetime is prolonged. Moreover, interlinking converters (ICs) provide a bridge between AC/DC buses in a hybrid microgrid. The power control of IC is enabled when the AC- or DC-side suffer from active power demand shortage. In particular, if the AC microgrid does not satisfy the reactive power demand, IC then acts as a static synchronous compensator (STATCOM). The effectiveness of the proposed strategies is verified by simulations.
Highlights
Distributed generation (DG) has attracted more attention due to the perceived advantages of easy integration of resources, high energy utilization efficiency, flexible installation location, and low power transmission losses [1,2]
The effectiveness ofbeen the proposed coordinated control strategy, simulation model of the system has built in Matlab/Simulink, and the layoutthe is shown in model of the hybrid system has been built in Matlab/Simulink, and the layout is shown in Figure includes twotwo units, one PV generation, and loads1.inThe the hybrid
This paper proposes an autonomous power flow control to coordinate distributed components This paper proposes an autonomous power flow control to coordinate distributed components of a hybrid microgrid, consisting of energy storage (ES) units, PV generators, and interlink converters
Summary
Distributed generation (DG) has attracted more attention due to the perceived advantages of easy integration of resources, high energy utilization efficiency, flexible installation location, and low power transmission losses [1,2]. For the optimal operation of hybrid microgrid [33,34], a simple algorithm is developed to determine the required sizing of generating units and the associated storage capacity in [33] It requires the state of charge information of the battery in real-time. A coordinated power control paradigm is proposed in a hybrid microgrid by generating and the associated storage in [33]. (4) To improve the system efficiency, an effective principle of an IC is developed to coordinate both and DC subgrid microgrids This AC paper is organized as follows: in Section 2, this work starts with a hybrid microgrid architecture based onisPV and ES.
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