Apparatus and method for controlling mppt of photovoltaic system using active power control

A method of controlling maximum power point tracking (MPPT) of a photovoltaic system using active power control, the method comprising:

• inputting a terminal voltage (Vpv) of a parallel capacitor to an active power-based inverter control unit;
• receiving, by an inverter power control signal output unit of the active power-based inverter control unit, a value of the terminal voltage (Vpv) and determining a reference value (Pmpp) for output power (Pinv) of a photovoltaic inverter from the received value to output an inverter power control signal (P*inv);
• receiving, by a power controller, the inverter power control signal (P*inv) from the inverter power control signal output unit to output a grid current control signal (I*grid);
• receiving, by a current controller, a grid current (igrid), a phase angle (θ) of a phase locked loop (PLL), and the grid current control signal (I*grid) to output an output control signal (m) for controlling a pulse width modulation (PWM);
• receiving, by a PWM control signal generator, the output control signal (m) of the current controller to output a PWM control signal for controlling an output of the photovoltaic inverter;
• and
• performing, by the photovoltaic inverter, an operation according to MPPT control for tracking the value of the terminal voltage changed according to a solar irradiance.