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Title: Analysis, design and implementation of high performance control schemes in renewable energy source based DC/AC inverter for micro-grid application
Keywords: High-performance control, Reneable energy systems, Micro-grid system, DC/AC inverter, series inverter, parallel inverter
Issue Date: 25-Nov-2011
Citation: SOUVIK DASGUPTA (2011-11-25). Analysis, design and implementation of high performance control schemes in renewable energy source based DC/AC inverter for micro-grid application. ScholarBank@NUS Repository.
Abstract: In this thesis, novel high-performance control techniques are proposed to interface renewable energy distributed generator (DG) based DC/AC inverters with micro-grid. Different control techniques are proposed to take care of both single-phase and three-phase operating conditions. In the first part of the thesis, a Lyapunov function based current controller is proposed for a single-phase parallel connected inverter along with a local load connection. The proposed control system ensures specific tracking of the inverter current derived by single phase p-q theory to ensure a specific amount of active and reactive grid power consumption along with total control of grid current THD. The proposed controller gives superior performance over conventional rotational PI or resonant controller. In the second part of the thesis, a single-phase series connection of the DG inverter along with micro-grid and load is proposed. The proposed method ensures rated high quality of load voltage even at the presence of sag, swell or harmonic distortion in the micro-grid voltage, using a Spatial Repetitive Controller, which gives the same performance under dynamic drift in micro-grid frequency. In this method also the total load active power is controllably shared between inverter and micro-grid with the assurance of leading micro-grid power-factor even if the load power-factor is lagging. In the last part of the thesis, DG inverter connection is considered in parallel to a generalized three-phase micro-grid with local load. Controllable load power sharing with grid current THD is also ensured here with Lyapunov function based current controller. The three-phase p-q theory and FBD theory based approaches are used to find the inverter current reference and the corresponding effects on DC link side ripples are also investigated. Both B-6 (six-switch) and B-4 (four-switch) three-phase inverter topologies are used for such DG interconnection. Detailed experimental results are provided to show the efficacy of each of the methodologies.
Appears in Collections:Ph.D Theses (Open)

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