DIRECT CURRENT VOLTAGE SENSOR FAILURE DIAGNOSIS OF THE SYSTEM CONNECTION TYPE POWER CONVERSION DEVICE CAPABLE OF REMARKABLY REDUCING THE TIME DELAY BY MODELING, A FAILURE PERMISSION CONTROLLING DEVICE, AND A METHOD THEREOF

摘要

PURPOSE: A direct current voltage sensor failure diagnosis, a failure permission controlling device, and a method thereof are provided to show the two-dimensional current in the three-dimensional current through the axis conversion process for the failure diagnosis and the failure permission control of the direct current terminal voltage sensor of the system connection type sunlight generation system, and are provided to implement the failure diagnosis and the failure permission control of the direct current terminal voltage sensor by the difference between the estimated voltage value and the real voltage value, thereby having the preventing the time delay and saving the maintenance cost of the modeling.;CONSTITUTION: A device for the failure diagnosis is comprised of the followings: a voltage type inverter (10) which is connected to a system; a phase synchronization loop unit (20) for executing the phase synchronization between the three-dimensional voltage; a current axis conversion unit (30) which executes the axis conversion from the three-dimensional current to the two-dimensional voltage; a voltage axis conversion unit (40) which executes the axis conversion from the three-dimensional voltage to the two-dimensional voltage; a failure diagnosis and a failure permission controlling unit (50) which diagnosis and controls the failure by comparing the measurement value of the current terminal voltage and the current terminal voltage sensor; and an SVPWM (60) whish switches a control signal of the failure permission controlling unit.;COPYRIGHT KIPO 2013;[Reference numerals] (10) Voltage type inverter; (20) Phase synchronization loop unit; (30) Current axis conversion unit; (40) Voltage axis conversion unit; (50) Failure diagnosing and failure permission controlling unit