Serially connected inverters
First Claim
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1. A method comprising:
- converting, using each of a plurality of inverters comprising output terminals connected serially to form a serial output, input power to output alternating-current (AC) power at the output terminals of each of the plurality of inverters while maintaining a serial voltage of the serial output substantially equal to and in synchronization with a grid voltage of a grid connected across the serial output; and
based on a failure in operating at least one of the plurality of inverters;
bypassing the at least one of the plurality of inverters using an AC current bypass configured to pass an alternating current; and
operating others of the plurality of inverters to adjust the serial voltage to be substantially equal to the grid voltage.
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Abstract
A photovoltaic power generation system, having a photovoltaic panel, which has a direct current (DC) output and a micro-inverter with input terminals and output terminals. The input terminals are adapted for connection to the DC output. The micro-inverter is configured for converting an input DC power received at the input terminals to an output alternating current (AC) power at the output terminals. A bypass current path between the output terminals may be adapted for passing current produced externally to the micro-inverter. The micro-inverter is configured to output an alternating current voltage significantly less than a grid voltage.
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Citations
21 Claims
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1. A method comprising:
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converting, using each of a plurality of inverters comprising output terminals connected serially to form a serial output, input power to output alternating-current (AC) power at the output terminals of each of the plurality of inverters while maintaining a serial voltage of the serial output substantially equal to and in synchronization with a grid voltage of a grid connected across the serial output; and based on a failure in operating at least one of the plurality of inverters; bypassing the at least one of the plurality of inverters using an AC current bypass configured to pass an alternating current; and operating others of the plurality of inverters to adjust the serial voltage to be substantially equal to the grid voltage. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A system comprising:
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a plurality of inverters, each inverter of the plurality of inverters comprising; input terminals; output terminals; and an alternating-current (AC) current bypass configured to pass an alternating current, wherein the output terminals of the plurality of inverters are connected serially and configured to form a serial voltage output when the input terminals are connected to power from a power source, wherein each inverter of the plurality of inverters is configured to convert input power received at the input terminals of the inverter to output AC power at the output terminals of the inverter while maintaining a serial voltage of the serial voltage output substantially equal to and synchronized with a grid voltage of a grid when the grid is connected across the serial voltage output, and wherein, based on a failure in operating at least one of the plurality of inverters, each inverter of the plurality of inverters is configured to bypass the at least one of the plurality of inverters using the AC current bypass and adjust the serial voltage output to be substantially equal to the grid voltage. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. An apparatus comprising:
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a first inverter, the first inverter comprising; input terminals; output terminals; and an alternating-current (AC) current bypass configured to pass an alternating current; wherein the apparatus is configured to generate, at the output terminals, part of a serial voltage output that is formed when the input terminals are connected to input power from a power source; wherein the first inverter is configured to convert the input power to output AC power at the output terminals of the first inverter while maintaining, together with at least one other inverter, the serial voltage output to be substantially equal to and synchronized with a grid voltage of a grid when the grid is connected across the serial voltage output; wherein, based on a failure in operating the at least one other inverter, the first inverter is configured to adjust the serial voltage output to the grid voltage; and wherein, based on a failure in operating the first inverter, the first inverter is configured to bypass the output terminals of the first inverter using the AC current bypass. - View Dependent Claims (16, 17, 18, 19, 20, 21)
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Specification