Reduced‐order dynamic model for droop‐controlled inverter/converter‐based low‐voltage hybrid AC/DC microgrids – Part 2: DC sub‐microgrid and power exchange. Issue 4 (16th November 2018)

• Record Type: Journal Article
• Authors: Rasoolzadeh, Arsalan; Salmasi, Farzad Rajaei
• Is Part Of: IET smart grid. Volume 1:Issue 4(2018)
• Page Start: 134
• Page End: 142
• Publication Date: 2018-11-16
• Subjects: AC‐DC power convertors -- invertors -- distributed power generation -- reduced order systems -- observers -- power generation faults -- fault diagnosis -- power generation control; reduced‐order dynamical modelling -- droop‐controlled inverter‐based low‐voltage hybrid AC‐DC microgrids -- droop‐controlled converter‐based low‐voltage hybrid AC‐DC microgrids -- DC submicrogrid -- power exchange -- AC subMG -- DC subMG -- bidirectional AC‐DC converter -- electrical loads -- constant current -- constant power -- constant resistance loads -- load ratios -- overall decentralised control -- overall dynamical equation -- overall algebraic equation -- PSCAD -- Matlab‐Simulink -- model‐based fault detection observer -- model‐based fault diagnosis observer; C1220 Simulation, modelling and identification -- C1310 Control system analysis and synthesis methods -- C3340H Control of electric power systems -- B8120K Distributed power generation -- B8360J AC‐DC power convertors (rectifiers) -- B8360N DC‐AC power convertors (invertors); Smart power grids -- Periodicals; Computer science -- Periodicals; Energy industries -- Periodicals; Broadcasting -- Periodicals; 333.79110285
• DOI: 10.1049/iet-stg.2018.0070
• Languages: English
• ISSNs: 2515-2947

Abstract

Abstract : This study focuses on reduced‐order dynamical modelling of droop controlled converter‐based DC sub‐microgrid (MG) in a hybrid AC/DC MG. In hybrid MGs, electrical power is exchanged between the AC and DC sub‐MGs by a bidirectional AC/DC converter. The authors aim to develop a comprehensive reduced‐order dynamical model for the DC side in this part, incorporating standard classes of electrical loads including constant current, constant power, and constant resistance loads. Furthermore, dynamical behaviour of the power exchange between the AC and DC sub‐MGs is modelled, considering that the bidirectional power converter controller aims to equalise the load ratios of AC and DC sub‐MGs in order to facilitate overall decentralised control over the hybrid MG. Analytical derivations of steady‐state values of main variables are given and the overall dynamical and algebraic equations are determined. In order to validate the developed model, a hybrid MG is implemented in PSCAD. Then, the proposed model for the case study is implemented in Matlab/Simulink and the results are compared with the PSCAD outputs. The comparative results show the validity of the developed reduced‐order comprehensive model. The reduced‐order models are preferred in designing observers such as model‐based fault detection and diagnosis observers.