Decoupled Simultaneous Complex Power Sharing and Voltage Regulation in Islanded AC Microgrids

Secondary control with reduced communication requirements for accurate reactive power sharing in AC microgrids

“…[7–9], the proposed method is not limited to a specific distribution network topology and eliminates voltage and frequency deviation. The proposed secondary control scheme resolves the error in reactive power sharing of the conventional hierarchical control method [10] without increasing communication requirements. In contrast to centralised secondary control schemes [13, 14] which require transfer of each DER's dedicated data to the central controller, the proposed scheme reduces required communication bandwidth and communication burden by utilising common data transmission to all DERs, regardless of the number of DERs. It also eliminates the need for DERs to have data transmission capability. Distributed secondary control schemes [11, 17] require the overall communication bandwidth and communication burden to be high, while they increase with the number of DERs. In contrast, the proposed method has lower communication requirements and is not affected by the number of DERs.…”

“…Although the sparse communication networks [12, 18] and event‐triggered schemes [19–22] reduce the communication burden, the required bandwidth remains high. Additionally, the proposed method does not necessitate data transfer capability for DERs. Unlike the existing commutation‐based solutions which focus on reactive power sharing error among dispatchable DERs [11–14, 17–19] or grid‐connected PV systems [27, 28], the proposed method provides accurate reactive power sharing among dispatchable DERs and PV systems.…”

“…In the distributed secondary control method, each DER calculates the vertical shift of its P-f and Q-V droop characteristics based on the information received from other DERs, therefore, the reactive power sharing error is reduced to zero, and deviations of frequency and voltage are compensated [11,17]. This method provides higher reliability as the failure of one unit does not affect system performance.…”

“…It also eliminates the need for DERs to have data transmission capability. � Distributed secondary control schemes [11,17] require the overall communication bandwidth and communication burden to be high, while they increase with the number of DERs. In contrast, the proposed method has lower communication requirements and is not affected by the number of DERs.…”

“…Additionally, the proposed method does not necessitate data transfer capability for DERs. � Unlike the existing commutation-based solutions which focus on reactive power sharing error among dispatchable DERs [11][12][13][14][17][18][19] or grid-connected PV systems [27,28], the proposed method provides accurate reactive power sharing among dispatchable DERs and PV systems.…”