Harmonic feedback control for an inverter
First Claim
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1. An inverter system comprising:
- an inverter for inverting DC power into AC power wherein the AC power includes a fundamental component and harmonics thereof;
means connected between an AC output of the inverter and a load for sensing harmonics in the AC power;
means coupled to the sensing means for generating a harmonic waveform having a harmonic component for each harmonic sensed in the AC power; and
means coupled to the generating means for controlling the inverter in accordance with the harmonic waveform such that the harmonics in the AC power are reduced.
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Abstract
Harmonics in the AC output power of an inverter are sensed and are compared to corresponding references to produce a plurality of errors. These errors are used to produce a harmonic waveform which is in turn used in a triangular waveform PWM pulse generator to generate PWM pulses. The PWM pulses control the inverter so as to convert DC power into AC power and so as to reduce harmonics in the AC power.
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Citations
25 Claims
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1. An inverter system comprising:
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an inverter for inverting DC power into AC power wherein the AC power includes a fundamental component and harmonics thereof; means connected between an AC output of the inverter and a load for sensing harmonics in the AC power; means coupled to the sensing means for generating a harmonic waveform having a harmonic component for each harmonic sensed in the AC power; and means coupled to the generating means for controlling the inverter in accordance with the harmonic waveform such that the harmonics in the AC power are reduced. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. An inverter system for inverting DC power into AC power and for reducing selected harmonics in the AC power, the AC power having a fundamental frequency and the selected harmonics being harmonics of the fundamental frequency, the inverter system comprising:
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inverting means for inverting the DC power into the AC power; harmonic sensing means connected between an AC output of the inverter and a load for sensing a component of the selected harmonics; function generating means for generating a sinusoidal function dependent upon the component; PWM pulse generating means responsive to the sinusoidal function for generating PWM pulses; and
,connecting means for connecting the PWM pulses to the inverting means, the PWM pulses controlling the inverting means so as to reduce the selected harmonics in the AC power. - View Dependent Claims (15, 16, 17, 18, 19)
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20. A method for inverting DC power into AC power comprising the following steps:
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supplying DC power to an inverter; inverting the DC power to AC power; sensing harmonics in the AC power wherein each of the harmonics has a frequency; comparing each of the harmonics to a reference in order to produce a plurality of errors, each error being dependent upon a different one of the harmonics; producing a plurality of multiplied functions by multiplying each of the errors by a corresponding one of a plurality of sinusoidal functions, each of the sinusoidal functions having a frequency substantially equal to the frequency of the harmonic from which its corresponding error is produced; comparing the multiplied functions to a triangular wave to produce PWM pulses; and
,supplying the PWM pulses to the inverter, the inverter inverting the DC power into AC power in response to the PWM pulses so as to reduce the harmonics in the AC power. - View Dependent Claims (21, 22, 23, 24, 25)
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Specification