DC/AC SYSTEM INTERCONNECTION DEVICE AND AC/AC SYSTEM INTERCONNECTION DEVICE
First Claim
1. A DC/AC system interconnection device that is able to bidirectionally and directly perform power conversion between three-phase AC power and DC power, the device comprising:
- a bidirectional switch circuit that is provided between a three-phase AC power supply and a DC power supply and turns on and off power between the three-phase AC power supply and the DC power supply;
a control unit that generates, in a predeteimined switching cycle, a first carrier waveform pattern, which has a pattern that varies for each mode, according to a plurality of modes divided according to a magnitude relation between voltages in each phase in the three-phase AC power, that performs virtual AC/DC conversion processing to acquire a plurality of interline voltage generation sections, in which two phases of the three-phase AC power are selected, based on the first carrier waveform pattern in the predetermined switching cycle and a first control signal corresponding to a phase of the three-phase AC power, that generates a second carrier waveform pattern, which varies according the plurality of modes, corresponding to the plurality of interline voltage generation sections acquired from the virtual AC/DC conversion processing, and that generates a switching pattern of the bidirectional switch circuit to perform virtual DC/DC conversion processing, which varies according to the plurality of modes, on an interline voltage across two phases selected from the plurality of interline voltage generation sections based on the generated second carrier waveform pattern and a second control signal corresponding to a phase of the DC power;
a current setting unit that inputs a current set value indicating a current direction and an amount of current which flows between the DC power supply and the bidirectional switch circuit;
a current detection unit that detects the current direction and an amount of current which flows between the DC power supply and the bidirectional switch circuit; and
a current adjustment unit that generates the second control signal which increases and decreases a signal level such that the current direction and the amount of current detected by the current detection unit become the current set value.
1 Assignment
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Accused Products
Abstract
A device includes a bidirectional switch circuit 10, a control unit 20 that perforins virtual AC/DC conversion processing to acquire a plurality of interline voltage generation sections according to a plurality of modes divided according to a magnitude relation between voltages in each phase and that generates a switching pattern of the bidirectional switch circuit 10 to perform virtual DC/DC conversion processing corresponding to the plurality of interline voltage generation sections based on a second carrier waveform pattern CW2 according to the plurality of modes and a signal level G1 of a P-phase, a current setting unit 50 that inputs a current direction and an amount of current that flows in a power line LU, a current detection unit 51 that detects the current direction and the amount of current of the power line LU, and a current adjustment unit 52 that increases and decreases the signal level G1.
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Citations
10 Claims
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1. A DC/AC system interconnection device that is able to bidirectionally and directly perform power conversion between three-phase AC power and DC power, the device comprising:
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a bidirectional switch circuit that is provided between a three-phase AC power supply and a DC power supply and turns on and off power between the three-phase AC power supply and the DC power supply; a control unit that generates, in a predeteimined switching cycle, a first carrier waveform pattern, which has a pattern that varies for each mode, according to a plurality of modes divided according to a magnitude relation between voltages in each phase in the three-phase AC power, that performs virtual AC/DC conversion processing to acquire a plurality of interline voltage generation sections, in which two phases of the three-phase AC power are selected, based on the first carrier waveform pattern in the predetermined switching cycle and a first control signal corresponding to a phase of the three-phase AC power, that generates a second carrier waveform pattern, which varies according the plurality of modes, corresponding to the plurality of interline voltage generation sections acquired from the virtual AC/DC conversion processing, and that generates a switching pattern of the bidirectional switch circuit to perform virtual DC/DC conversion processing, which varies according to the plurality of modes, on an interline voltage across two phases selected from the plurality of interline voltage generation sections based on the generated second carrier waveform pattern and a second control signal corresponding to a phase of the DC power; a current setting unit that inputs a current set value indicating a current direction and an amount of current which flows between the DC power supply and the bidirectional switch circuit; a current detection unit that detects the current direction and an amount of current which flows between the DC power supply and the bidirectional switch circuit; and a current adjustment unit that generates the second control signal which increases and decreases a signal level such that the current direction and the amount of current detected by the current detection unit become the current set value. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An AC/AC system interconnection device that performs power conversion between three-phase AC power supplies, the device comprising:
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a first bidirectional switch circuit that performs bidirectional power conversion between first three-phase AC power on a side of a first three-phase AC power supply and first DC power by switching; a second bidirectional switch circuit that performs bidirectional power conversion between second three-phase AC power on a side of a second three-phase AC power supply and second DC power by switching; a DC power line that is connected to the first bidirectional switch circuit and the second bidirectional switch circuit and performs power movement between the first DC power and the second DC power; a first control unit that controls switching of the first bidirectional switch circuit; a second control unit that controls switching of the second bidirectional switch circuit; an electric energy detection unit that detects a current direction and moving electric energy of a current which flows between the first bidirectional switch circuit and the second bidirectional switch circuit; and an electric energy instruction unit that instructs of electric energy which moves between the first three-phase AC power supply and the second three-phase AC power supply and a current direction, wherein the first control unit generates a switching pattern of the first bidirectional switch circuit and the second control unit generates a switching pattern of the second bidirectional switch circuit such that the current direction detected by the electric energy detection unit and the detected electric energy become the current direction and electric energy instructed by the electric energy instruction unit. - View Dependent Claims (8, 9, 10)
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Specification