A POWER CONVERTING APPARATUS FOR A GRID-CONNECTED TRANSFORMERLESS TYPE PHOTOVOLTAIC GENERATION SYSTEM

摘要

PURPOSE: A power conversion device of a non transformer type system interconnection solar cell generating system is provided to reduce the harmonic of the system output current by constantly controlling the output of current. CONSTITUTION: A maximum output point following control module(210) presently uses the information of an output current and output voltage with the past of a solar cell. The maximum output point following control module forms an output voltage control standard value for occurring the maximum output power in the current state. An output voltage control module forms an output current control reference value. An output current control module(230) calculates the proper switching time(241) of each switching devices by using an error message. It is made the calculated switching time in the switching of the DC/DC converter into the on/off signal(251) and a PWM generator(240) controls the DC/DC converter.