Method and system of harmonic regulation
AssigneeDRS Power & Control Technologies, Inc.
InventorJames A. Ulrich
Life of this patent
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Abstract
A system and method of harmonic regulation includes a harmonic regulator configured to cancel or inject harmonics into a power conversion system. A resettable integrator is provided to determine at least one harmonic coefficient of the at least one error signal harmonic. The resettable integrator determines the at least one harmonic coefficient over a single signal period and is then reset. The harmonic regulator further includes at least one adder to determine a difference of the harmonic coefficient and the reference harmonic coefficient and a regulator is provided to determine an at least one axis harmonic reference signal. The harmonic regulator outputs a three-phase final electrical reference signal that is input into a DC/AC inverter of a power conversion system.
Claims40
A method of harmonic regulation, comprising the steps of:
- determining at least one reference harmonic coefficient;
- identifying an energizing signal having a plurality of harmonics;
- selecting at least one harmonic of the energizing electrical signal;
- determining at least one harmonic coefficient of the at least one harmonic of the energizing electrical signal over a single signal period;
- and
- generating a multiphase electrical reference signal, wherein the multiphase electrical reference signal is a function of the at least one reference harmonic coefficient and the at least one harmonic coefficient.
A method of harmonic regulation, comprising the steps of:
- determining at least one reference harmonic coefficient;
- identifying an enegrizing signal having a plurality of harmonics;
- selecting at least one harmonic of the energizing electrical signal;
- determining at least one harmonic coefficient of the at least one harmonic of the energizing electrical signal over a single signal period;
- generating a multiphase electrical reference signal;
- and
- determining an error factor, wherein the error factor includes a difference of the at least one reference harmonic coefficient and the at least one harmonic coefficient.
A method of harmonic regulation for a power conversion system comprising the steps of:
- determining at least one reference harmonic coefficient;
- receiving at least one reference input electrical signal and at least one feedback electrical signal;
- determining an electrical error signal from the at least one reference input electrical signal and the at least one feedback electrical signal;
- selecting at least one harmonic having at least one coefficient from the electrical error signal;
- determining an electrical angle, θe, corresponding to the selected harmonic;
- determining a sine signal and a cosine signal of the electrical angle;
- integrating the sine signal and the cosine signal over one signal time period, T;
- comparing the integrated sine signal and the integrated cosine signal to at least one reference harmonic coefficient;
- determining at least one harmonic axis signal;
- and
- injecting of the at least one harmonic axis signal into a power conversion system.
A harmonic regulator comprising:
- a feedback signal detector configured to determine a feedback error signal and further configured to determine an electrical angle, θe, and a feedback signal period;
- a harmonic selector configured to select a feedback error signal harmonic;
- a resettable integrator configured to determine at least one harmonic coefficient of the at least one error signal harmonic, wherein the at least one harmonic coefficient is determined over the one feedback signal period;
- at least one adder configured to determine a difference of the at least one harmonic coefficient and the at least one reference harmonic coefficient;
- a regulator configured to amplify and integrate the difference and further configured to determine at least one axis harmonic reference signal;
- an inverse rotator configured to receive the at least one axis harmonic reference signal having an inverse rotator output;
- and
- at least one summer configured to determine a final electrical reference signal from the inverse rotator output.
A computer program comprising a set of instructions for one or more computers that when executed, causes the one or more computers to:
- determine at least one reference harmonic coefficient;
- receive at least one reference electrical signal and at least one instantaneous electrical signal;
- determine an electrical error signal from the at least one reference electrical signal and the at least one instantaneous electrical signal;
- select at least one harmonic having at least one coefficient from the electrical error signal;
- apply a discrete Fourier transformation to the at least one harmonic to determine a first integrated signal and a second integrated signal;
- compare the first integrated signal and the second integrated signal to the at least one reference harmonic coefficient;
- and
- determine at least one reference harmonic axis signal;
- and
- inject the at least one reference harmonic axis signal into a power conversion system.
Dependencies are inferred from the claim text.