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Review of Active and Reactive Power Sharing Strategies in Hierarchical Controlled Microgrids

Review of Active and Reactive Power Sharing Strategies in Hierarchical Controlled Microgrids Review of Active and Reactive Power Sharing Strategies in Hierarchical Controlled Microgrids Abstract: Microgrids consist of multiple parallel-connected distributed generation (DG) units with coordinated control strategies, which are able to operate in both grid-connected and islanded modes. Microgrids are attracting considerable attention since they can alleviate the stress of main transmission systems, reduce feeder losses, and improve system power quality. When the islanded microgrids are concerned, it is important to maintain…

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Reactive Power Flow Control for PV Inverters Voltage Support in LV Distribution Networks

Reactive Power Flow Control for PV Inverters Voltage Support in LV Distribution Networks Reactive Power Flow Control for PV Inverters Voltage Support in LV Distribution Networks Abstract: This paper proposes a reactive power flow control pursuing the active integration of photovoltaic systems in LV distribution networks. An alternative power flow analysis is performed according to the specific characteristics of LV networks, such as high resistance/reactance ratio and radial topologies. The proposed solution gives high performances, in terms of rms-voltage regulation, by estimating the…

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Distributed Optimal Control of Reactive Power and Voltage in Islanded Microgrids

Distributed Optimal Control of Reactive Power and Voltage in Islanded Microgrids Distributed Optimal Control of Reactive Power and Voltage in Islanded Microgrids Abstract: This paper presents a distributed optimal control strategy for islanded microgrids, which allows performing reactive power sharing and voltage regulation without using a communication system. To perform the twofold objectives, a small signal model is first developed to reconstruct the system input-output relationship, which is evaluated through sensitivity analysis. A state estimator is then constructed to observe reactive power distribution…

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Approach to setting gateway reactive power control band for distribution networks with wind power

Approach to setting gateway reactive power control band for distribution networks with wind power Approach to setting gateway reactive power control band for distribution networks with wind power Abstract: The integration of distributed wind farm leads to additional fluctuation of power flow in a high-voltage distribution network, which has become a major concern in automatic voltage control. This study proposes a slack optimal control method to determine the tolerance band of gateway reactive power (GRP) which takes into account voltage constraints, energy loss…

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Reactive Power Ancillary Service of Synchronous DGs in Coordination With Voltage Control Devices

Reactive Power Ancillary Service of Synchronous DGs in Coordination With Voltage Control Devices Reactive Power Ancillary Service of Synchronous DGs in Coordination With Voltage Control Devices Abstract: This paper presents an optimal way to control steady-state voltage in distribution feeders using reactive power ancillary service that is provided by synchronous distributed generators (DGs). Based on load forecasts provided one day in advance, DG reactive power is dispatched on the hour in coordination with the switching operations of an on-load tap changer (OLTC) and…

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