| 摘要 |
An apparatus to deliver an alternating current (AC) power may include a controller having a processor and a memory. The apparatus may also include a plurality of power inverters in communication with the controller. Each power inverter may be configured to convert direct-current (DC) power into the (AC) power. Each of the plurality of power inverters may be configured to be controlled by the controller to generate AC power below at least one predetermined operating threshold. The plurality of power inverters may be configured to combine AC power generated by each of the plurality of power inverters, such that the combined AC power is delivered to a common AC load above the predetermined operating threshold. The apparatus may be arranged and operated according to a ratio of FMA=Fr/N, where Fr=fs/fl, fs is the switching frequency of the plurality of power inverters, fl is the frequency of the common AC load, and N is the number of power inverters of the apparatus. |
| 主权项 |
1. A power inverter configured to receive power from a photovoltaic panel comprising a plurality of solar cells and to deliver an alternating current (AC) power, at a first frequency, fu, to a power grid, the power inverter comprising:
a controller having a processor and a memory; an input converter having (i) an input configured to receive a DC input from the photovoltaic panel and (ii) an output coupled to a DC power bus, the input converter configured to supply a DC output to the DC power bus; an output converter (i) having an input coupled to the DC power bus and (ii) configured to deliver the AC power at an AC output; and an active filter electrically connected to the DC power bus and in communication with the controller, the active filter comprising:
at least two switching converters electrically coupled in parallel at a first common node and a second common node, wherein each switching converter of the at least two switching converters includes:
a first switch having a first terminal electrically coupled to the first common node and a second terminal electrically coupled to an internal node of the corresponding switching converter;a second switch having a first terminal electrically coupled to the internal node and a second terminal electrically coupled to the second common node; andat least one corresponding energy storage device electrically coupled to the internal node,wherein each said switching converter is configured to supply a first AC power with a fundamental frequency at twice the first frequency to and absorb a second AC power with a fundamental frequency at twice the first frequency from the DC power bus using the at least one corresponding energy storage device of the corresponding switching converter,wherein each of the first switch and the second switch is configured to operate in a series of switching cycles during which the relative timing and duration of the on and off times of each of the first switch and the second switch is configured to be controlled by the controller to control the AC power delivered by each said switching converter, and wherein the controller is configured to control the switching cycles of the at least two plurality of switching converters to be interleaved with respect to one another. |
