Power management with an energy storage system

A method for managing power of a system with an energy storage system (ESS), the method comprising:

• coupling one or more loads of the system to a common direct current (DC) bus;
• measuring, via an ESS controller, a DC voltage of the common DC bus;
• estimating, via the ESS controller, an estimated nominal DC voltage (Vnom) for the common DC bus based on a change in the DC voltage over time;
• determining, via the ESS controller, a first DC voltage set point (DCSP) for each of one or more inverters on the ESS based on the estimated nominal DC voltage, wherein the one or more inverters are electrically connected to the common DC bus, and wherein the first DCSP is a desired DC voltage on the common DC bus;
• and
• controlling current flow through the one or more inverters to maintain the DC voltage of the common DC bus based on the first DCSP wherein controlling current flow through the one or more inverters further comprises:
• determining a desired DC current set point representative of a desired current through the one or more inverters;
• receiving sensor data representative of an actual current flowing through the one or more inverters;
• and
• adjusting an intermediate DCSP for the one or more inverters based on the sensor data and the desired DC current set point.