Reduced‐order dynamic model for droop‐controlled inverter/converter‐based low‐voltage hybrid AC/DC microgrids – part 1: AC sub‐microgrid. Issue 4 (15th October 2018)

• Record Type: Journal Article
• Authors: Rasoolzadeh, Arsalan; Salmasi, Farzad Rajaei
• Is Part Of: IET smart grid. Volume 1:Issue 4(2018)
• Page Start: 123
• Page End: 133
• Publication Date: 2018-10-15
• Subjects: distributed power generation -- power generation control -- AC‐DC power convertors -- invertors; droop‐controlled inverter/converter‐based low‐voltage hybrid AC/DC -- reduced‐order dynamical modelling -- droop‐controlled inverter‐based low‐voltage AC sub‐microgrid -- hybrid AC/DC microgrid -- comprehensive reduced‐order model -- low‐voltage AC side -- reduced‐order models -- hybrid microgrid -- bidirectional AC/DC converter -- main AC bus -- power inverters -- frequency commands -- droop controllers -- voltage magnitude -- algebraic equations -- reduced‐order dynamic model; B1210 Power electronics, supply and supervisory circuits -- B8360 Power convertors and power supplies to apparatus -- C3340H Control of electric power systems -- B8120K Distributed power generation; Smart power grids -- Periodicals; Computer science -- Periodicals; Energy industries -- Periodicals; Broadcasting -- Periodicals; 333.79110285
• DOI: 10.1049/iet-stg.2018.0069
• Languages: English
• ISSNs: 2515-2947

Abstract

Abstract : This study focuses on reduced‐order dynamical modelling of droop‐controlled inverter‐based low‐voltage AC sub‐microgrid in a hybrid AC/DC microgrid. The authors aim to develop a comprehensive reduced‐order model for the low‐voltage AC side in this part. The reduced‐order models are preferred in real‐time calculations. In hybrid microgrids, electrical power is exchanged between the AC and DC sub‐microgrids by a bidirectional AC/DC converter. The distributed energy resources are connected to the main AC bus through power inverters. Voltage and frequency commands are generated by droop controllers for each inverter. For the main AC bus, equations describing voltage magnitude and frequency are derived. Steady‐state values of the phase angles and injected power of the inverters are calculated. The overall non‐linear dynamical and algebraic equations are derived for the low‐voltage AC side, and then linearised around the operating point. To validate the developed model, a hybrid microgrid is implemented in PSCAD. Then, the proposed model for the case study is implemented in Matlab/Simulink and the results are compared with PSCAD outputs. The comparative results show the validity of the developed comprehensive reduced‐order model which can be used in fault detection approaches.