APPARATUS FOR CONTROLLING DIRECT CURRENT TERMINAL VOLTAGE OF CONSTRUCTION MACHINERY EQUIPPED WITH MOTOR, AND METHOD FOR SAME

摘要

An exemplary embodiment suggested in the present specification provides an apparatus and a method of controlling a voltage of a direct current terminal of construction machinery equipped with a motor, which are capable of improving energy efficiency of a power conversion apparatus, such as an inverter and a converter by changing a voltage of the direct current terminal to an optimum voltage size in consideration of operation conditions of a swing motor, an engine auxiliary motor, and an energy storage apparatus.

主权项

1. An apparatus for controlling a voltage of a direct current terminal of construction machinery equipped with a motor, the apparatus comprising:
one or more inverters connected to one or more motors which convert electric energy into mechanical energy or regenerate mechanical energy to electric energy, respectively, to control the one or more motors; a converter connected to an energy storage apparatus storing regenerative power generated by the one or more motors to control the energy storage apparatus; a direct current terminal capacitor connected between the one or more inverters and the converter, and configured to receive power through the one or more inverters and collect the regenerated power through the converter; and a control unit configured to generate one or more inverter demanded voltages demanded by the one or more inverters and a converter demanded voltage demanded by the converter, and variably control a direct current terminal voltage of the direct current terminal capacitor based on the one or more generated inverter demanded voltages and the generated converter demanded voltage; and wherein the control unit calculates a maximum demanded voltage among the one or more generated inverter demanded voltages and the converter demanded voltage, and variably controls the direct current terminal voltage of the direct current terminal capacitor according to the calculated maximum demanded voltage.