Micro-grid experiment system

Abstract

The invention relates to a micro-grid experiment system which comprises a wind power generation unit, a photovoltaic grid-connected power generation unit, an energy storage unit, a third-class load, a load control device, a dummy load, a PV (photovoltaic) simulator, a frequency converter, an AC (Alternate Current) grid-connected cabinet, a micro-grid switching-in cabinet, a central controller, interconnection switches, a cable and a bus. By the state of each interconnection switch, different operation modes and configuration modes of a plurality of micro-grids can be realized. The operation modes comprise a single micro-grid grid-connected mode, a multiple micro-grid grid-connected mode, a single micro-grid islanding mode, a multiple micro-grid islanding mode and a transient mode. The system effectively utilizes renewable energy sources. The influence of power supply on the environment is reduced. A gel battery and a super capacitor are used as energy storage elements, so that not only is the micro-grid experiment system economic, but also the pollution to the environment is reduced and the micro-grid experiment system has relatively long service life and high charging speed. The system can be used for developing research on various micro sources such as wind, light, storage and the like, a combined system of the micro sources, various micro-grid operation modes and micro-grid and distribution network interactive influence and has excellent expansibility on both hardware and software.

Description

technical field [0001] The invention relates to the technical field of smart micro-grids, in particular to a micro-grid experiment system using renewable energy for power generation. Background technique [0002] Distributed Generation (DG) has attracted more and more attention because of its great advantages in power supply reliability, flexibility and reducing environmental pollution. The incorporation of a large number of DGs in the conventional power grid will have a great impact on the transient stability, voltage stability, and frequency control of the power grid. In order to give full play to the potential of DG, multiple DGs, energy storage devices and controllable loads can be composed of microgrids according to a certain topology. The core issue of microgrid research is how to ensure the steady-state operation of the microgrid and how to maintain transient stability after the microgrid is disturbed, that is, the control strategy of the microgrid. The construction...

AI Technical Summary

Problems solved by technology

The DG of the CERTS microgrid demonstration project in the United States uses three 60 kW micro gas turbines with identical specifications and capacities to achieve peer-to-peer control, but it does not solve the core problem of peer-to-peer control, that is, multiple distributed power grids with inverter interfaces. Power peer-to-peer control policy issues

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