Active power conditioner for AC load characteristics
First Claim
1. An active power conditioner, said active power conditioner connected with a load and a power source in parallel, comprising:
- a DC power capacitor providing a stabilized dc voltage;
a power converter configured by a bridge power electronic switch set, the power converter having a DC side connected with the DC power capacitor, and an AC side;
a high-frequency filter connected with the AC side of the power converter, the high-frequency filter filtering high-frequency harmonics caused by switching operation of the power converter; and
a control circuit controlling the power electronic switch set of the power converter, the control circuit only detecting a voltage of the DC power capacitor and a current of the power source to generate driving signals for the power converter;
wherein the driving signals generated from the control circuit actuates the power electronic switch set of the power converter to switch the voltage built by the DC power capacitor that supplies a current via the high-frequency filter, the current supplied from the active power conditioner reduces the harmonic and reactive currents of the load such that a current supplied from the power source is a sinusoidal waveform and approximates in phase with the voltage of the power source.
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Abstract
An active power conditioner, connecting with a load and a power source in parallel, includes a DC power capacitor, a power converter, a high-frequency filter and a control circuit. The control circuit detects the voltage of the DC power capacitor and the current of the power source, thereby performing a closed loop control to stabilize the voltage of the DC power capacitor and performing a feed forward control to generate a driving signal for driving the power converter. The power converter actuates the DC power capacitor to supply a current via the high-frequency filter to reduce the reactive and harmonic components of load current. The load is converted to the linear resistance characteristic, observed from the power source side.
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Citations
21 Claims
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1. An active power conditioner, said active power conditioner connected with a load and a power source in parallel, comprising:
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a DC power capacitor providing a stabilized dc voltage; a power converter configured by a bridge power electronic switch set, the power converter having a DC side connected with the DC power capacitor, and an AC side; a high-frequency filter connected with the AC side of the power converter, the high-frequency filter filtering high-frequency harmonics caused by switching operation of the power converter; and a control circuit controlling the power electronic switch set of the power converter, the control circuit only detecting a voltage of the DC power capacitor and a current of the power source to generate driving signals for the power converter; wherein the driving signals generated from the control circuit actuates the power electronic switch set of the power converter to switch the voltage built by the DC power capacitor that supplies a current via the high-frequency filter, the current supplied from the active power conditioner reduces the harmonic and reactive currents of the load such that a current supplied from the power source is a sinusoidal waveform and approximates in phase with the voltage of the power source. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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Specification