GRID TIE SOLAR SYSTEM AND A METHOD

摘要

A grid tie system includes a plurality of solar panels, a plurality of inverters, wherein each of the inverters is in electrical communication with at least one of the solar panels to convert a direct current to an alternating current, wherein each of the inverters has an active state and an inactive state and at least one of the inverters includes a tracking component to track a maximum power point of at least one of the solar panels, and a controller in communication with at least one of the inverters for selectively toggling the at least one of the inverters between the active state and the inactive state.

主权项

1. A grid tie system for a solar array including a plurality of solar panel strings, each of the solar panel strings including a plurality of solar panels connected in series for generating a DC power output comprising:
a DC bus for receiving the DC power output from the solar panels; a plurality of disconnect boxes spaced along a length of the DC bus, each of the disconnect boxes disposed between the DC bus and an associated one of the solar panel strings to provide selective electrical communication therebetween; a plurality of inverters, wherein each of the inverters has an input in electrical communication with the DC bus and an output for converting the DC power output to an AC power output, wherein each of the inverters has an active state and an inactive state and includes a maximum power point tracker to track a maximum power point of at least one of the solar panels, the input of each of the inverters being directly connected to the DC bus by wiring; an electrical transformer in communication with an electrical grid and the inverters to receive the AC power output from the inverters and step-up a voltage of the AC power output to match a voltage of the grid, wherein the transformer includes a separate impedance balanced primary winding for each of the inverters; and a controller in communication with the inverters for selectively toggling the inverters between the active state and the inactive state while maintaining at least one of the inverters in the active state to maximize the AC power output and reduce power losses within the grid tie system, the controller responding to the DC power output of the solar panels exceeding a collective capacity of the inverters operating in the active state to toggle another one of the inverters in the inactive state to the active state, the maximum power point tracker of the another one inverter determining a maximum power point for operation of the another one inverter to regulate an operating voltage of the DC bus while all others of the inverters in the active state each operate at an associated maximum current point.