ACCURATE REACTIVE POWER SHARING IN AN ISLANDED MICROGRID USING ADAPTIVE VIRTUAL IMPEDANCES

electrical engineering

An improved microgrid reactive power sharing strategy was proposed with linear loads and nonlinear loads. With linear load, the method injects a real-reactive power transient coupling term to identify the errors of reactive power sharing and then compensates the errors using a slow integral term for the DG voltage magnitude control. In addition, the proposed method is not sensitive to microgrid configurations, which is especially suitable for a complex mesh or networked microgrid. This proposed control method with non linear loads, the reactive power sharing introduces power transient and unequal power sharing by all DG units. A control strategy to improve reactive power sharing in an is-landed microgrid has been proposed by using STATCOM and validated in this project. The strategy employs communication to exchange the information needed to tune adaptive virtual impedances in order to compensate for the mismatch in feeder impedances. The control strategy does not require knowledge of the feeder impedances, and is straightforward to implement in practice. It is also in-sensitive to time delays in the communication channels. It has been shown that the proposed technique is tolerant of disruptions in the communication links while still outperforming the conventional droop control method. The sensitivity of the tuned controller parameters to changes in the system operating point has also been investigated. It has been shown that the system operating point is mainly determined by the power factor, and the higher the load power factor, the less sensitive the parameters are to the operating point. The effectiveness of the proposed system is designed using MATLAB software.

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