Performance evaluation of a three-phase nine level voltage source converter using selective harmonic elimination technique / Aisha Muhammad

Aisha, Muhammad (2017) Performance evaluation of a three-phase nine level voltage source converter using selective harmonic elimination technique / Aisha Muhammad. Masters thesis, University of Malaya.

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Abstract

Multi-level converters are attracting research interest; this is because of their tremendous positive contribution they are making in the medium power industries. The converter has put hope in the minds of power electronic engineers that a time will come when it will break a record by providing an efficient means of utilizing the abundant renewable energy resources. This research report aims at ultimately producing an optimized 3 phase nine level multilevel voltage source inverter for renewable energy sources which reduces the size of the converter by using a single dc source as an input to generate a nine level 3-phase output voltage waveform which is nearly sinusoids. The circuit comprises of three sets of parallel connected cascaded configurations powered using a single source (photovoltaic, battery, wind etc.). The cascaded configuration composed of two parallel connected modules that are connected to a specially made transformer having to independent primaries and series connected secondary sides with 1:1 turns ratio. Selective harmonic elimination method is used to eliminate the lower other odd harmonics. This is achieved by controlling the fundamental component at certain predetermined point per quarter wave cycle. In this thesis, a 3-phase five level converter with (3/9) distribution ratio was designed and simulated. The converter was able to eliminate eleven lower order non-triplen harmonics. This shows how SHE can improve the performance of a converter without the need for additional components. The results obtained yield a positive outcome, giving the converter an upper hand over it counterparts and the possibility of taking the lead in renewable energy applications.

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