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Title: Implementation and testing of paralleled droop controlled three phase inverters
Authors: Mizzi, Neil
Keywords: Microgrids (Smart power grids)
Electric inverters
Distributed generation of electric power
Issue Date: 2019
Citation: Mizzi, N. (2019). Implementation and testing of paralleled droop controlled three phase inverters (Bachelor’s dissertation).
Abstract: The main grid is no exception to improvement and evolution. The grid’s main function is to transmit and distribute electricity, from both the suppliers to the consumers and vice versa. The later has become more prominent, such as with excess solar power generation in Malta. These last ten years, power engineers have researched and developed different types of microgrids to facilitate the integration of distributed energy resources (DERs). These microgrids are able to interconnect together and to the main grid, increasing the reliability and efficiency of the latter. Microgrids can perform in conjunction with the main grid (grid-tied mode) or autonomously (islanded-mode). Microgrids employ several power electronic converters (PECs) in order to connect the DERs and specific local loads to its main bus. Furthermore, these PECs such as inverters are controlled via certain load sharing techniques. The main focus of this dissertation is the study of droop controlled three-phase inverters and their paralleling to form an islanded AC microgrid. As part of the study, a lab-based prototype with two parallel inverters capable of sharing the load connected to the microgrid was designed, implemented and tested. The project may be sub-divided into four main stages. Firstly, Stage 1 is concerned with the system modelling and design for the droop controlled inverters. This also includes the ability of one inverter to synchronise with the microgrid voltage and to connect once the synchronisation criteria have been met. Consecutively Stage 2 consists of the simulation of the complete system model, verifying the correct operation of the designed control loops. In Stage 3, the hardware prototypes’ power circuitry and PCBs required for sensing and interfacing with the three-phase inverters were implemented. Furthermore, the control algorithms developed in stage 1 were programmed in the respective µCs of both inverters. Finally, Stage 4 encompassed the testing and analysis of the individual inverter prototypes’ ability to provide power to the local load, as well as their load sharing capabilities when connected in parallel. Paralleling between two three-phase inverters utilising hierarchical control was successfully achieved in the laboratory. Testing and analysis of the inverters’ ability to separately supply and share power when in parallel was conducted.
Description: B.ENG (HONS)
Appears in Collections:Dissertations - FacEng - 2019
Dissertations - FacEngIEPC - 2019

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