Inverter array control

A power inverter configured to receive power from a direct current (DC) input source and to deliver alternating current (AC), at a first frequency, fu, the power inverter comprising:

• a controller having a processor and memory;
• an active filter in communication with the controller and configured to supply AC power at twice the first frequency, the active filter comprising:
• at least two switching converters, each switching converter comprising a set of switches and configured to deliver an AC current, each set of switches configured to operate in a series of switching cycles during which the relative timing and duration of the on and off times of each switch within the set of switches is configured to be controlled by the controller to control AC power delivered by each switching converter, the duration of each switching cycle defining a switching period and a switching frequency, fs, for a switching converter, and wherein the controller is configured to control the switching cycles of the plurality of switching converters to be interleaved with respect to one another.

A method of operating an array of direct current (DC)—alternating current (AC) inverters, comprising:

• configuring the array to comprise N switching DC-AC inverters, the inverters configured so that the array FMA<4, where FMA=Fr/N, Fr=fs/fu and where fs is the switching frequency of the DC-AC inverters and fu is the frequency of current delivered by the array of DC-AC inverters, and
• controlling the array of DC-AC inverters to operate in an interleaved manner.