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Droop control is an effective power sharing control scheme for islanding microgrid. With the load increasing, the microgrid may face overload challenge. Dispatch system should schedule energy storage system to provide power reserve or load shedding for preventing islanding microgrid black out. This paper proposes a coordinate control scheme for distributed generation (DG) units and active loads to...
In thermal error modeling, traditional methods of system identification modeling based on modern control theory are influenced unfavourably by the boundedness of modeling information (data) and unmodeled dynamics, so it is difficult to improve the robustness and accuracy of the model. With the appearance of big data, a fresh angle of view, however, is provided for improving the model accuracy and...
Droop control is an effective power sharing control scheme of distributed generation (DG) inverters in islanding AC microgrid, which can stabilize the grid as long as the distributed generation systems have sufficient residual power. On the contrary, many loads have equipped with power conversion circuits in front to improve the operational efficiency, e.g. air conditioners and LED lighting, which...
This paper presents a unified power quality conditioner (UPQC) and its control strategy for assisting the fault ride-through operation of large-scale photovoltaic (PV) power station. The output voltage of PV station can be controlled to its rated value with UPQC under high grid voltage fault condition. Moreover, it can absorb reactive power from the grid under high voltage condition to support the...
This paper proposes an improved power sharing control scheme to achieve the accurate power sharing control and offer an improved PCC voltage regulation capability in islanding microgrid. An enhanced virtual impedance design is assumed in the conventional droop control scheme to manage distributed generation (DG) units to export the accurate reactive power in proportion to their rating. A point of...
The rapid development of photovoltaic (PV) generation systems has made the low voltage ride-through (LVRT) techniques, which is stepping forward fast, more and more important. This paper presents a review of LVRT techniques for PV generation systems, which mainly focuses on the critical techniques of fault detection and grid synchronization, current control and dc-link voltage control under various...
Large-scale wind power is integrated into one regional power grid in western China, as well as local thermal power. When the power generated is enough for the local grid, the extra will be sent outside. Based on one regional power grid named HM power grid, this paper mainly analysis its operation characteristics. Firstly, transmission limit of wind power in HM power grid is simulated by restriction...
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