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Power quality of ac bus voltage is a key issue for microgrids. A model-predictive-control (MPC)-based distributed bus voltage compensation methods using inverter-interfaced distributed generators (DGs) connected to the concerned bus is proposed. The presented method can compensate bus voltage unbalance and harmonics and share the compensated current between inverters autonomously, with neither communication...
This paper proposes a novel control strategy for the smooth transition between grid-attached and islanded mode of microgrid. The proposed control strategy is based on a proportional resonant current controller to regulate inverter current, without requiring any islanding detection algorithm or switching between different controllers. Equal power sharing is achieved as well by droop control using reference...
As more and more distributed generators with intermittent characteristics are applied in microgrids, centralized control scheme encounters great challenges. In this paper, a fully distributed cooperative control scheme for Virtual Synchronous Generator based microgrid is proposed. Specifically, Virtual Synchronous Generator algorithm is developed as the primary controller of microgrid such that inverter...
The microgrid must be able to transfer from grid-connected mode into islanding operation mode seamlessly to guarantee the power reliability for the critical local load. In the grid-tied mode, the power exchanged with the main grid should be smoothed to reduce the disturbance to the main grid, while the quality of the bus voltage in the islanding operation mode is significant. This paper presents a...
Microgrids consisting of distributed generators (DGs) have the ability to operate connected to the utility grid and also in stand-alone (island) mode. In both cases, frequency and voltage regulation across the microgrid must be ensured, and the DGs should share their generation equally. The transition of the microgrid between the two operating modes also needs to be seamless, which is conventionally...
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