A Battery Powered 3MW Matrix Inverter As A Black Start Unit To Replace Diesel Powered Black Start Generator In A Grid Connected Power Generation Plant

Abstract

A power plant generator that supply a nationwide grid generally using the grid power itself to create the essential magnetic flux inside the generator's large rotor via a feedback connection from the grid to the rotor winding. Without the magnetic flux in the rotor winding, the generator could not produce the required electrical output at the output terminal, even when the rotor rotates at the required rated turning speed. During grid total blackout or unplanned outage, the grid has no electrical power and voltage at all, thus no magnetic flux will be produce by the rotor winding. To kickstart the generator, the rotor winding must be powered up first. As the grid is without its power, the rotor winding must get the voltage to restart its magnetic field from elsewhere. The solution is by using a blackstart diesel generator. However, a diesel generator has a lot of moving parts, and discharge exhaust fumes that are polluting the environment. So this paper proposed that a battery-powered matrix inverter could be used to replace the diesel generator function. The battery-powered matrix inverter system was built and tested on the Matlab Simulink platform. The result shows that the matrix inverter could restart the gas turbine generator with a cleaner system.