METHOD AND SYSTEM FOR CONTROLLING DC BUS VOLTAGE

A method for controlling a DC bus voltage in a DC bus system, the system including a DC bus and an energy storage unit coupled to the DC bus, includes: detecting a DC bus voltage; detecting, by the energy storage unit, a DC bus voltage of the DC bus; determining, by the energy storage unit, a power reference value based on the DC bus voltage; and adjusting, by the energy storage unit, one of output power and absorbing power based on the power reference value.