Method and apparatus for controlling an inverter using pulse mode control
First Claim
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1. A method for controlling a photovoltaic module inverter, the method comprising:
- determining whether to operate the photovoltaic module inverter in a sinusoidal pulse mode; and
generating, in response to determining to operate the photovoltaic module inverter in a sinusoidal pulse mode, a sinusoidal output pulse waveform at an output of the photovoltaic module inverter, the sinusoidal output pulse waveform comprising a plurality of pulse periods in which a positive pulse and a negative pulse are generated, wherein each corresponding positive pulse and negative pulse is separated from each other by a storage period in which substantially no output power is delivered by the photovoltaic module inverter.
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Abstract
A method and apparatus for controlling an inverter includes operating the inverter in a one of a normal run mode or a pulse mode depending on one or more criteria. When operating in the pulse mode, the inverter generates a sinusoidal output pulse waveform including a plurality of pulses having a determined pulse width. The pulse width is less than a half-wave period of a full-cycle sinusoidal waveform and may be determined as function of, for example, the output power of the inverter, a grid voltage, and/or other criteria.
191 Citations
20 Claims
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1. A method for controlling a photovoltaic module inverter, the method comprising:
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determining whether to operate the photovoltaic module inverter in a sinusoidal pulse mode; and generating, in response to determining to operate the photovoltaic module inverter in a sinusoidal pulse mode, a sinusoidal output pulse waveform at an output of the photovoltaic module inverter, the sinusoidal output pulse waveform comprising a plurality of pulse periods in which a positive pulse and a negative pulse are generated, wherein each corresponding positive pulse and negative pulse is separated from each other by a storage period in which substantially no output power is delivered by the photovoltaic module inverter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A photovoltaic module inverter comprising:
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an output converter to generate a sinusoidal output pulse waveform at an output of the photovoltaic module inverter; and an output converter controller coupled to the output converter and configured to; (i) determine whether to operate the output converter in a sinusoidal pulse mode, and (ii) control the output converter, in response to a determination to operate the output converter in the sinusoidal pulse mode, to generate the sinusoidal output pulse waveform, wherein the sinusoidal output pulse waveform comprises a plurality of pulse periods, each pulse period comprising a positive pulse separated from a negative pulse by a storage period in which substantially no output power is delivered by the photovoltaic module inverter. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. One or more machine-readable media comprising a plurality of instructions stored therein, which when executed by an output converter controller of a photovoltaic module inverter, cause the output converter controller to:
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determine whether to operate an output converter of the photovoltaic module inverter in a sinusoidal pulse mode; and control the output converter, in response to a determination to operate the output converter in the sinusoidal pulse mode, to generate a sinusoidal output pulse waveform at an output of the photovoltaic module inverter, wherein the sinusoidal output pulse waveform comprises a plurality of pulse periods, each pulse period comprising a positive pulse separated from a negative pulse by a storage period in which substantially no output power is delivered by the photovoltaic module inverter. - View Dependent Claims (18, 19, 20)
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Specification