Development and analysis of three phase seven level trinary DC source multilevel inverter

Hazwal, Ngadeni (2014) Development and analysis of three phase seven level trinary DC source multilevel inverter. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

Inverter is electronic equipment used to convert Direct Current (DC) supply to Alternating Current (AC). There are many types of inverter exists and among all, multilevel inverter produce less harmonic compared to the conventional two level inverter. Harmonic do no useful work and it degrades the power quality of the electrical system also sometimes can cause malfunction of equipment. By using multilevel inverter, total harmonic distortion can be reduced by increase the output voltage level. However, for multilevel inverter, increasing of output voltage level will cause additional components to the circuit. This will increase the implementation cost, the inverter will be more bulky and not practical to implement. In this research, analysis of Three Phase Trinary Multilevel Inverter is conducted. Trinary multilevel inverter has the ability to produce high output voltage level with minimum components usage. The analysis is conducted using MATLAB/Simulink simulation tools for Three Phase Square Inverter, Three Phase Quasi Inverter and Three, Five, Seven and Nine Level of Trinary Multilevel Inverter, meanwhile for analysis on hardware is only focus on Three Phase Seven Level DC Source MLI. Different types of load are connected to the inverter to analyze the output voltage and current characteristics for all inverter mentioned above. Data gathered from the simulation and hardware is compared in terms of total harmonic distortion. The comparison shows that, the voltage THD is decrease as the number of level is increase. Three Level Trinary MLI produce 31.08% of voltage THD meanwhile for Nine Level Trinary MLI, the voltage THD reduce to 15.12%. This proved that the output voltage level of Trinary MLI is significantly affected to the voltage THD which is higher level of Trinary MLI will produce lower voltage THD. Hardware and simulation result also shows that for RL load, the current THD is less than using R load.

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