Patent ID: 8885373

Claim:
An energy conversion system comprising: first and second energy conversion subsystems, each subsystem comprising a DC source, a DC/DC converter, and a DC/AC converter, the first and second DC/AC converters having respective output ends coupled in parallel to an AC load; a ground terminal; a grounding circuit comprising a first branch coupled on a first end to a node in the first energy conversion subsystem and on a second end to the ground terminal, the first branch including a first leakage current sensor, and a second branch coupled on a first end to a node in the second energy conversion subsystem and on a second end to the ground terminal, the coupling node in the second energy conversion subsystem being homogenous with respect to the coupling node in the first energy conversion subsystem, the second branch including a second leakage current sensor; and control circuitry effective to generate leakage current control signals for the respective DC/DC converters by determining an average leakage current comprising a first polarity with respect to the first energy conversion subsystem and a second polarity with respect to the second energy conversion subsystem from the respective first and second current sensors; comparing the determined average leakage current to a predetermined reference current value; and executing a regulator algorithm to calculate a corrective action comprising the second polarity with respect to the first energy conversion subsystem and a corrective action comprising the first polarity with respect to the second energy conversion subsystem based on the comparison.