Hybrid synchronization phase angle generation method
First Claim
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1. A synchronization phase angle generator for synchronizing an AC power source with a power grid, comprising:
- a phase locked loop (PLL) controller which receives at least one voltage of the power grid and determines a frequency and a phase angle of the at least one voltage of the power grid; and
a microprocessor-based controller which receives as input the frequency and the phase angle of the at least one voltage of the power grid and determines a phase angle of at least one output voltage of the AC power source.
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Abstract
A hybrid use of a phase-locked-loop controller and a microprocessor-based controller to synchronize the phase angles of a three-phase AC power source, such as a static power converter, with those of a three-phase power grid. The phase-angle synchronization may enable the AC power source to be safely connected to the power grid to provide additional power capacity.
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Citations
50 Claims
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1. A synchronization phase angle generator for synchronizing an AC power source with a power grid, comprising:
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a phase locked loop (PLL) controller which receives at least one voltage of the power grid and determines a frequency and a phase angle of the at least one voltage of the power grid; and
a microprocessor-based controller which receives as input the frequency and the phase angle of the at least one voltage of the power grid and determines a phase angle of at least one output voltage of the AC power source. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method for synchronizing a polyphase power grid with a polyphase AC power source (APS), comprising:
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receiving a phase voltage of the polyphase power grid;
performing a phase-locked-loop (PLL) operation to derive and lock on to a phase angle of the power grid phase voltage;
generating a digitally quantized phase angle for an output phase voltage of the APS, wherein the generated phase angle of the APS output phase voltage is synchronized with the lock-on phase angle of the power grid phase voltage. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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21. A synchronization phase angle generator for synchronizing an AC power source with a power grid, comprising:
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a phase locked loop (PLL) controller which receives at least one voltage of the power grid and determines a frequency and a phase angle of the at least one voltage of the power grid; and
a microprocessor-based controller which receives as input the frequency and the phase angle of the at least one voltage of the power grid and determines a phase angle of at least one output voltage of the AC power source wherein the microprocessor-based controller is programmed to;
determine an initial phase angle of the at least one voltage of the power grid from the phase angle of the at least one voltage of the power grid for each of a number of cycles of the at least one voltage of the power grid, determine an increment angle from the frequency of the at least one voltage of the power grid for at least one step during each of the number of cycles of the at least one voltage of the power grid, and determine the phase angle of the at least one output voltage of the AC power source for at least one step during each of the number of cycles of the at least one voltage of the power grid based on the determined initial phase angle and the determined increment angle of the at least one voltage of the power grid. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37)
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38. A method for synchronizing a polyphase power grid with a polyphase AC power source (APS), comprising:
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receiving a phase voltage of the polyphase power grid;
performing a phase-locked-loop (PLL) operation to derive a phase angle and a frequency of the phase voltage of the polyphase power grid and lock on to the phase angle of the power grid phase voltage;
determining an initial phase angle value from the derived phase angle of the phase voltage of the polyphase power grid for each of a number of cycles of the phase voltage of the polyphase power grid;
determining an increment angle value from the derived frequency of the phase voltage of the polyphase power grid for at least one step during each of the number of cycles of the phase voltage of the polyphase power grid; and
determining the phase angle of an output phase voltage of the APS for at least one step during each of the number of cycles of the phase voltage of the polyphase power grid based on the determined initial phase angle value and the determined increment angle value, wherein the phase angle of the APS output phase voltage is synchronized with the lock-on phase angle of the power grid phase voltage. - View Dependent Claims (39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50)
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Specification