Power conversion apparatus
First Claim
1. A power conversion apparatus in a plurality of power conversion apparatuses forming a power system, each apparatus including a voltage type power convertor for converting a DC power to a AC power or the AC power to the DC power and for supplying a converted power, connected to DC lines, comprising:
- direct current voltage detection means for detecting the DC voltage of each voltage type power converter;
power detection means for detecting the power converted from the AC power to the DC power or from the DC power to the AC power by the voltage type power convertor;
power control means for outputting a first active power reference signal for the voltage type power convertor based on a power reference value and a detected value detected by the power detection means;
direct current control means for outputting a second active power reference signal for the voltage type power convertor based on a direct current voltage reference value and a detected value detected by the direct current voltage detection means; and
an adder receiving the first active power reference signal and the second active power reference signal and supplying an active power instruction signal;
gate control means for firing switching elements incorporated in the voltage type power convertor based on the active power instruction signal.
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Accused Products
Abstract
A power conversion apparatus has a voltage type power convertor, a power control circuit for outputting a first active power reference signal for the voltage type power convertor based on a power reference value Pref and a detection value P of a power detector, a DC voltage detector for outputting a second active power reference signal for the voltage type power convertor based on a DC voltage reference value Vdref and a detection value Vd of the DC voltage detector, and a gate control circuit for firing switching elements in the voltage type power convertor based on both first and second active power reference signals.
17 Citations
21 Claims
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1. A power conversion apparatus in a plurality of power conversion apparatuses forming a power system, each apparatus including a voltage type power convertor for converting a DC power to a AC power or the AC power to the DC power and for supplying a converted power, connected to DC lines, comprising:
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direct current voltage detection means for detecting the DC voltage of each voltage type power converter; power detection means for detecting the power converted from the AC power to the DC power or from the DC power to the AC power by the voltage type power convertor; power control means for outputting a first active power reference signal for the voltage type power convertor based on a power reference value and a detected value detected by the power detection means; direct current control means for outputting a second active power reference signal for the voltage type power convertor based on a direct current voltage reference value and a detected value detected by the direct current voltage detection means; and an adder receiving the first active power reference signal and the second active power reference signal and supplying an active power instruction signal; gate control means for firing switching elements incorporated in the voltage type power convertor based on the active power instruction signal. - View Dependent Claims (20, 21)
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2. A power conversion apparatus in a plurality of power conversion apparatuses forming a power system, each apparatus including a voltage type power convertor for converting a DC power to a AC power or the AC power to the DC power and for supplying a converted power, connected to DC lines, comprising:
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direct current voltage detection means for detecting the DC voltage of each voltage type power converter; power detection means for detecting the power converted from the AC power to the DC power or from the DC power to the AC power by the voltage type power convertor; power control means for outputting a first active power reference signal for the voltage type power convertor based on a power reference value and a detected value detected by the power detection means; direct current control means for outputting a second active power reference signal for the voltage type power convertor based on a direct current voltage reference value and a detected value detected by the direct current voltage detection means; and gate control means for firing switching elements incorporated in the voltage type power convertor based on the first active power reference signal and the second active power reference signal, wherein an output limit value for limiting a magnitude of the first active power reference signal is set in the power control means, and the magnitude of the first active power reference signal output from the power control means is limited based on the limit value. - View Dependent Claims (14, 15)
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3. A power conversion apparatus in a plurality of power conversion apparatuses forming a power system, each apparatus including a voltage type power convertor for converting a DC power to a AC power or the AC power to the DC power and for supplying a converted power, connected to DC lines, comprising:
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direct current voltage detection means for detecting the DC voltage of each voltage type power converter; power detection means for detecting the power converted from the AC power to the DC power or from the DC power to the AC power by the voltage type power convertor; power control means for outputting a first active power reference signal for the voltage type power convertor based on a power reference value and a detected value detected by the power detection means; direct current control means for outputting a second active power reference signal for the voltage type power convertor based on a direct current voltage reference value and a detected value detected by the direct current voltage detection means; and gate control means for firing switching elements incorporated in the voltage type power convertor based on the first active power reference signal and the second active power reference signal, wherein a different output limit value is set in each power control means for each voltage type power convertor in each power conversion apparatus. - View Dependent Claims (10)
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4. A power conversion apparatus in a plurality of power conversion apparatuses forming a power system, each apparatus including a voltage type power convertor for converting a DC power to a AC power or the AC power to the DC power and for supplying a converted power, connected to DC lines, comprising:
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direct current voltage detection means for detecting the DC voltage of each voltage type power converter; power detection means for detecting the power converted from the AC power to the DC power or from the DC power to the AC power by the voltage type power convertor; power control means for outputting a first active power reference signal for the voltage type power convertor based on a power reference value and a detected value detected by the power detection means; direct current control means for outputting a second active power reference signal for the voltage type power convertor based on a direct current voltage reference value and a detected value detected by the direct current voltage detection means; and gate control means for firing switching elements incorporated in the voltage type power convertor based on the first active power reference signal and the second active power reference signal, wherein the direct current voltage control means of each voltage type power convertor further comprises a change rate suppress means to suppress a change rate per time of an output signal transferred from the direct current voltage detection means. - View Dependent Claims (7, 11, 16, 17)
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5. A power conversion apparatus in a plurality of power conversion apparatuses forming a power system, each apparatus including a voltage type power convertor for converting a DC power to a AC power or the AC power to the DC power and for supplying a converted power, connected to DC lines, comprising:
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direct current voltage detection means for detecting the DC voltage of each voltage type power converter; power detection means for detecting the power converted from the AC power to the DC power or from the DC power to the AC power by the voltage type power convertor; power control means for outputting a first active power reference signal for the voltage type power convertor based on a power reference value and a detected value detected by the power detection means; direct current control means for outputting a second active power reference signal for the voltage type power convertor based on a direct current voltage reference value and a detected value detected by the direct current voltage detection means and gate control means for firing switching elements incorporated in the voltage type power convertor based on the first active power reference signal and the second active power reference signal, wherein an output limit value for limiting a magnitude of the first active power reference signal is set in the power control means, and the magnitude of the first active power reference signal output from the power control means is limited based on the limit value, and wherein the direct current voltage control means of each voltage type power convertor further comprises a change rate suppress means to suppress a change rate per time of an output signal transferred from the direct current voltage detection means. - View Dependent Claims (8, 12, 18)
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6. A power conversion apparatus in a plurality of power conversion apparatuses forming a power system, each apparatus including a voltage type power convertor for converting a DC power to a AC power or the AC power to the DC power and for supplying a converted power, connected to DC lines, comprising:
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direct current voltage detection means for detecting the DC voltage of each voltage type power converter; power detection means for detecting the power converted from the AC power to the DC power or from the DC power to the AC power by the voltage type power convertor; power control means for outputting a first active power reference signal for the voltage type power convertor based on a power reference value and a detected value detected by the power detection means; direct current control means for outputting a second active power reference signal for the voltage type power convertor based on a direct current voltage reference value and a detected value detected by the direct current voltage detection means; and gate control means for firing switching elements incorporated in the voltage type power convertor based on the first active power reference signal and the second active power reference signal, wherein a different output limit value is set in each power control means for each voltage type power convertor in each power conversion apparatus, and wherein the direct current voltage control means of each voltage type power convertor further comprises a change rate suppress means to suppress a change rate per time of an output signal transferred from the direct current voltage detection means. - View Dependent Claims (9, 13, 19)
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Specification