Apparatus and method for controling power quality of power generation system

An apparatus for controlling the power quality of a power generation system including a DC/AC inverter converting DC voltage into AC voltage and supplying inverter current to a grid, comprising:

• a grid voltage phase follower generating a grid signal having a phase of the grid voltage;
• a fundamental extractor extracting a magnitude of a fundamental wave of a load current introduced into a non-linear load connected between the DC/AC inverter and the grid;
• a first calculator subtracting a preset current compensation value from the magnitude of the fundamental wave from the fundamental extractor;
• a second calculator generating an inverter current instruction value for the DC/AC inverter by using the output value of the first calculator and the grid signal and the load current from the grid voltage phase follower;
• and
• a controller controlling the DC/AC inverter based on the inverter current instruction value from the second calculator.

A method for controlling the power quality of a power generation system including a DC/AC inverter converting DC voltage into AC voltage and supplying inverter current to a grid, comprising:

• a grid signal generating step generating a grid signal having a phase of the grid voltage;
• a fundamental wave extracting step extracting a magnitude of a fundamental wave of a load current introduced into a non-linear load connected between the DC/AC inverter and the grid;
• a first operating step subtracting a preset current compensation value from the magnitude of the fundamental wave from the fundamental wave extracting step;
• and
• a second operating step generating an inverter current instruction value for the DC/AC inverter by using the output value of the first operating step and the grid signal and the load current from the grid signal generating step.