Application of linearised load flow method for droop‐controlled DCMGs. Issue 6 (6th February 2020)

• Record Type: Journal Article
• Authors: Maulik, Avirup; Das, Debapriya
• Is Part Of: IET generation, transmission & distribution. Volume 14:Issue 6(2020)
• Page Start: 1114
• Page End: 1126
• Publication Date: 2020-02-06
• Subjects: load flow control -- power system interconnection -- distributed power generation -- power distribution faults -- Newton‐Raphson method -- load flow -- iterative methods -- power distribution control -- power generation control; linearised load flow method -- linear power flow method -- droop‐controlled DC microgrids -- traditional power flow techniques -- droop‐controlled DCMGs owing -- voltage flexibility capability -- droop‐controlled dispatchable generation units -- droop‐control operation philosophy -- nonlinear equations -- power flow model -- constant power -- optimal power flow -- modified Newton–Raphson power flow -- linear power flow technique; Electric power production -- Periodicals; Electric power transmission -- Periodicals; Electric power distribution -- Periodicals; 621.3105
• DOI: 10.1049/iet-gtd.2018.7113
• Languages: English
• ISSNs: 1751-8687

Abstract

Abstract : In this study, the authors present a linear power flow method for droop‐controlled DC microgrids (MGs). Traditional power flow techniques do not apply to droop‐controlled DCMGs owing to the power and voltage flexibility capability of the droop‐controlled dispatchable generation units. Therefore, new power flow techniques embodying the droop‐control operation philosophy were developed by the researchers. The existing methods are time‐consuming since they involve iterative solutions of a set of non‐linear equations. The proposed linear power flow method is accurate, simple, and gives faster results in comparison to the existing methods. The power flow model applies to all load types (constant power, constant current, and constant resistance) and works for both radial and non‐radial system configurations. The linear power flow can be applied for convex optimisation, optimal power flow, and network reconfiguration problems. The proposed method is validated on five test systems. A comparison with a modified Newton–Raphson power flow demonstrates that the proposed linear power flow technique provides accurate results. The maximum error in voltage calculation is not more than 0.0812%. The performance of the proposed method is also acceptable for heavy loads and high line resistances. The computational time reduces significantly with the proposed method.