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Due to the inherent variability of Renewable Energy Generation Systems (REGSs), REGSs are commonly uncontrollable. Although microgrids can effectively monitor REGSs, it cannot directly manage and control the intermittent output characteristic of REGSs. Recently, many experts recommend that Energy Storage Systems (ESSs) should be integrated into REGSs to mitigate the instability and further reduce...
A hybrid power system placed in Beaufort Sea in order to power supply the offshore oil and gas platforms is investigated in this paper. The proposed microgrid includes various energy sources such as photovoltaic panels, wind turbines, diesel generator as a secondary power source and stationary storage system. Simulation of each component and the proposed topology is discussed with the energy management...
Three different energy storage systems by use of power electronics technologies are presented. These systems were applied to demonstrative microgrid projects which have concepts different one another. Concepts of the projects, requirements on energy storage systems and demonstration results are introduced.
Microgrids are distributed generation structures that link groups of Distributed Generators (DGs) to either connect to the utility grid, or to operate as a standalone (islanded) system. However, the injected power from each DG must be carefully controlled to ensure reliable power distribution, balanced modular operation, and regulated voltages across the microgrid. It is commonly accepted that DG...
In islanding microgrid, the impact of line impedance on the proportional power sharing cannot be neglected if multi-inverters are operated to form a microgrid. In this paper, an improved droop controller is proposed to reduce the unexpected dynamic and steady power sharing errors caused by the mismatching of line impedance. With this proposed combined compensation, the power quality, the dynamic and...
It is important for an autonomous microgrid to share the load demand properly among multiple distributed generation (DG) units. Normally, the traditional ω-P and E-Q droop control method is used for its “plug and play” feature. However, when employed in a low-voltage microgrid, the conventional droop control is subject to the power coupling and steady-state reactive power sharing errors. Furthermore,...
The precise output power control and seamless transit of micro-source converters (MSCs) between grid-tied and islanded operation modes are of great significance for the stability of voltage and frequency, and power flow control in a microgrid. The wireless droop control method (WDCM) is one of the effective methods for MSCs to share loads dynamically and automatically and realize the “plug and play”...
For the problem that paralleled inverters cannot share reactive power proportional to their power capacity in islanding microgrid. Originally, the effect of inverter output impedance and line impedance to reactive power sharing with conventional droop control is analyzed. Following, a method adjusting the output reactive power by paralleling capacitor at the inverter output is proposed, and the relationship...
Hybrid energy systems are considered as a promising solution for meeting the power needs of offshore platforms due to the advances in renewable energy technologies and the need for reduction of dependency on fossil fuels. However, the unpredictable behavior resulting from the fluctuation and intermittence of the renewable energy sources and their dependence on local meteorological conditions, executes...
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