Bidirectional active power conditioner with DC/AC inverter in low-frequency switching
First Claim
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1. A bidirectional active power conditioner, comprising:
- a DC side connected to a DC source;
a bidirectional DC/DC power converter having a high-frequency isolation transformer with a primary side and a secondary side, with each of the primary and secondary sides having a plurality of power electronic switches respectively, with the primary side connecting to the DC side and the power electronic switches being disabled or controlled via high-frequency PWM switching;
a DC/AC inverter having four power electronic switches and connecting with the secondary side of the bidirectional DC/DC power converter, with said power electronic switches of the DC/AC inverter being disabled or controlled via low frequency switching;
an AC side connected with the DC/AC inverter, said AC side further connected with one or both of a load and an AC source; and
a filter capacitor having two points directly connecting with two connecting points of the power electronic switches of the DC/AC inverter, wherein each connecting point forms a point where two power electronic switches of the DC/AC inverter connects in series,wherein an output current of the power electronic switches of the secondary side of the bidirectional DC/DC power converter equals an input current of the power electronic switches of the DC/AC inverter;
wherein when power is transmitted from the AC side to the DC side, the power electronic switches of the DC/AC inverter are all disabled to act as a rectifier, the power electronic switches at the primary side are all disabled, and the power electronic switches at the secondary side are controlled via high-frequency PWM switching;
wherein in a bidirectional power flow, the power electronic switches of the DC/AC inverter are all controlled via low frequency switching, and the power electronic switches of the bidirectional DC/DC power converter are all controlled via high-frequency PWM switching, with the bidirectional DC/DC power converter generating a predetermined DC voltage or a predetermined DC current and the DC/AC inverter converting the predetermined DC voltage or the predetermined DC current into a predetermined AC voltage or a predetermined AC current when power is transmitted from the DC side to the AC side.
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Abstract
A bidirectional active power conditioner includes a DC side, a bidirectional DC/DC power converter, a DC/AC inverter and an AC side. The DC side electrically connects with a DC source while the AC side electrically connects with a load and an AC source. The bidirectional DC/DC power converter is controlled via high-frequency pulse width modulation (PWM) switching so as to generate a predetermined DC voltage or DC current while the DC/AC inverter is controlled to convert the predetermined DC voltage or DC current into a predetermined AC voltage or AC current.
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Citations
18 Claims
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1. A bidirectional active power conditioner, comprising:
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a DC side connected to a DC source; a bidirectional DC/DC power converter having a high-frequency isolation transformer with a primary side and a secondary side, with each of the primary and secondary sides having a plurality of power electronic switches respectively, with the primary side connecting to the DC side and the power electronic switches being disabled or controlled via high-frequency PWM switching; a DC/AC inverter having four power electronic switches and connecting with the secondary side of the bidirectional DC/DC power converter, with said power electronic switches of the DC/AC inverter being disabled or controlled via low frequency switching; an AC side connected with the DC/AC inverter, said AC side further connected with one or both of a load and an AC source; and a filter capacitor having two points directly connecting with two connecting points of the power electronic switches of the DC/AC inverter, wherein each connecting point forms a point where two power electronic switches of the DC/AC inverter connects in series, wherein an output current of the power electronic switches of the secondary side of the bidirectional DC/DC power converter equals an input current of the power electronic switches of the DC/AC inverter; wherein when power is transmitted from the AC side to the DC side, the power electronic switches of the DC/AC inverter are all disabled to act as a rectifier, the power electronic switches at the primary side are all disabled, and the power electronic switches at the secondary side are controlled via high-frequency PWM switching; wherein in a bidirectional power flow, the power electronic switches of the DC/AC inverter are all controlled via low frequency switching, and the power electronic switches of the bidirectional DC/DC power converter are all controlled via high-frequency PWM switching, with the bidirectional DC/DC power converter generating a predetermined DC voltage or a predetermined DC current and the DC/AC inverter converting the predetermined DC voltage or the predetermined DC current into a predetermined AC voltage or a predetermined AC current when power is transmitted from the DC side to the AC side. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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Specification