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

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.