Methods for minimizing double-frequency ripple power in single-phase power conditioners
First Claim
1. A method for reducing a double-frequency ripple power exchanged between a load and an energy source, the energy source being configured to deliver electrical output power to the load through a single-phase power conditioner, the method comprising:
- determining a first phase shift of an alternating current (AC) output signal of the power conditioner;
determining an average AC output power of the power conditioner; and
generating an AC signal at an energy storage device, the AC signal having (i) an amplitude that is a function of the average AC output power and (ii) a phase shift substantially equal to 45 degrees minus an amount that is dependent on the determined first phase shift.
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Abstract
A method is provided for minimizing a double-frequency ripple power exchanged between a load and an energy source, the energy source delivering electrical power to the load through a single-phase power conditioner, and the power conditioner being coupled to an energy storage device. The method includes determining a phase shift of an AC output signal of the power condition and an average AC output power of the power conditioner. The average AC output power may be a predetermined value or a calculated value based on sensed or measured signals. The method further includes generating an AC signal at an energy storage device. The generated AC signal has an amplitude that is a function of the average AC output power and a phase shift substantially equal to 45 degrees minus an amount that is dependent on the determined phase shift. In some embodiments, the phase shift may be determined to be of a non-zero value.
187 Citations
24 Claims
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1. A method for reducing a double-frequency ripple power exchanged between a load and an energy source, the energy source being configured to deliver electrical output power to the load through a single-phase power conditioner, the method comprising:
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determining a first phase shift of an alternating current (AC) output signal of the power conditioner; determining an average AC output power of the power conditioner; and generating an AC signal at an energy storage device, the AC signal having (i) an amplitude that is a function of the average AC output power and (ii) a phase shift substantially equal to 45 degrees minus an amount that is dependent on the determined first phase shift. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method for reducing a double-frequency ripple power exchanged between a load and an energy source, the energy source being configured to deliver electrical output power to the load through a single-phase power conditioner, the method comprising:
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sensing an AC output voltage signal of the power conditioner; sensing an AC output current signal of the power conditioner; determining a first phase shift of the AC output current relative to the AC output voltage signal; determining an average AC output power of the power conditioner as a function of the AC output voltage and the AC output current; and generating an AC signal at an energy storage device, the AC signal having (i) an amplitude that is a function of the average AC output power, (ii) a frequency dependent upon a frequency of the average AC output power, and (iii) a phase shift substantially equal to 45 degrees minus an amount that is dependent on the determined first phase shift. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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21. A method for reducing a double-frequency ripple power exchanged between a load and an energy source, the energy source being configured to deliver electrical output power to the load through a single-phase power conditioner, the method comprising:
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determining a first phase shift of an AC output signal of the power conditioner; determining an average AC output power of the power conditioner; determining a first AC waveform having (i) an amplitude that is a function of the average AC output and (ii) a phase shift substantially equal to 45 degrees minus an amount that is dependent on the determined first phase shift; and generating a second AC signal at an energy storage device, the AC second signal having a form that is a piecewise combination of the first AC waveform and an inverse of the first AC waveform. - View Dependent Claims (22, 23, 24)
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Specification