Abstract
With the increasing penetration of renewable distributed generations (DGs), large numbers of “energy prosumers” are emerging rapidly. There will be severe impacts on the utility grid if these renewable DGs are not managed properly. Smart electrical power devices which enable high flexibility in energy management, alleviation in harmonic pollutions and friendly interactions with the utility grid are needed urgently. To meet all these requirements, a novel energy router which enables a unique parallel operation mode to the energy prosumer is presented. Facilitated with a bi-directional DC/AC converter, a switch array module and a fuzzy logic based hierarchical control strategy, the presented energy router enables plug-and-play connections and reliable energy management for the energy prosumer. The switch array and the parallel mode enable the loads to be flexibly scheduled to reduce energy cost and improve system performance. MATLAB/Simulink model of the energy prosumer is set up and a fuzzy logic based hierarchical control strategy is implemented for transient power balance control in various operation modes. Simulation results have demonstrated high flexibility, stability and feasibility of the proposed energy router in energy management of the prosumer, which will contribute to the better utilization of the ever-growing renewable energies.
Highlights
Driven by the ever-growing energy consumption demand and the concern for environment protection, the existing electrical power grid will be shifting from the traditional single sourced, radial network to the multi-sourced, meshed, and renewable energy based power system of the generation – the Energy Internet [1], [2]
We develop a novel energy router which enables a unique ‘‘parallel operation mode’’ to the energy prosumer
Router layer control is implemented at the energy management level of the prosumer, which is a fuzzy logic control (FLC) based coordinated operation of the main converter, the energy storage (ES) unit, distributed generations (DGs) and the switch array, aiming for maintaining power balance, improving the efficiency of DG utilization and management of operation mode transformation of the energy prosumer
Summary
Driven by the ever-growing energy consumption demand and the concern for environment protection, the existing electrical power grid will be shifting from the traditional single sourced, radial network to the multi-sourced, meshed, and renewable energy based power system of the generation – the Energy Internet [1], [2]. The ‘‘main switch’’ between the 1st and 2nd AC buses is used to put the energy router in grid connected mode, while the array of SPDT switches enable the loads to be connected to different AC buses according to specified energy management strategies. Under the parallel operation mode, it is very convenient for prosumers to operate in clusters, the impact caused by renewable generation fluctuations and harmonic components of the power electronics devices to the grid can be alleviated remarkably. Router layer control is implemented at the energy management level of the prosumer, which is a fuzzy logic control (FLC) based coordinated operation of the main converter, the ES unit, DGs and the switch array, aiming for maintaining power balance, improving the efficiency of DG utilization and management of operation mode transformation of the energy prosumer.
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