System and method for protection during inverter shutdown in distributed power installations

摘要

A protection method in a distributed power system including of DC power sources and multiple power modules which include inputs coupled to the DC power sources. The power modules include outputs coupled in series with one or more other power modules to form a serial string. An inverter is coupled to the serial string. The inverter converts power input from the string and produces output power. When the inverter stops production of the output power, each of the power modules is shut down and thereby the power input to the inverter is ceased.

主权项

1. A distributed power system comprising:
a plurality of DC power converters providing a DC output; an inverter coupled to the DC power converters and adapted to convert input power received on the DC output from the DC power converters to provide output power to an electrical load; a monitoring mechanism configured to monitor at least one electrical parameter of the electrical load and detect when the at least one electrical parameter of the load is out of a predetermined specification; a shutdown mechanism coupled to the monitoring mechanism and configured to cause the inverter to stop the output power when the at least one electrical parameter is out of the predetermined specification; a switch disposed between the plurality of DC power converters and the inverter, wherein the switch is activated in response to the monitoring mechanism detecting the at least one electrical parameter of the load being out of the predetermined specification, and wherein the switch being activated causes a change in a current of the input power; and at least one controller configured to shut down the plurality of DC power converters in response to the change in the current of the input power.