APPARATUS AND METHOD FOR CHARGING AND DISCHARGING PHOTOVOLTAIC PCS INTEGRATED BATTERY
First Claim
1. An apparatus for charging and discharging a photovoltaic PCS integrated battery, comprising:
- a first DC/DC converter that converts PV voltage from a solar cell into a predetermined DC voltage according to a first DC/DC control;
a DC/AC inverter that is connected to a system and performs system voltage/DC voltage conversion or DC voltage/system voltage conversion according to a second DC/DC control;
a DC link unit that is connected in common to an output terminal of the first DC/DC converter and an output terminal of the DC/AC inverter to stabilize DC voltage from the first DC/DC converter and DC voltage from the DC/AC inverter;
a second DC/DC converter that is connected between the DC link unit and a battery to convert voltage bidirectionally according to a second DC/DC control;
a voltage/current detector that detects PV voltage/current from the solar cell, battery voltage/current from the battery, system voltage/current from the system, and DC link voltage/current from the DC link unit; and
a charging control unit that determines one of a plurality of predetermined control modes based on the voltage and current detected in the voltage/current detector and controls the first DC/DC converter, the second DC/DC converter, and the DC/AC inverter according to the determined control mode.
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Accused Products
Abstract
There are provided an apparatus and method for charging and discharging a photovoltaic PCS integrated battery applied to a system that includes a first DC/DC converter 110 connected to a solar cell 10, a DC/AC inverter 120, a DC link unit 130 connected in common to output terminals of the first DC/DC converter 110 and the DC/AC inverter 120, and a second DC/DC converter 140 having a bidirectional DC/DC conversion function connected between the DC rink unit 130 and the battery 30. The present invention calculates the amount of photovoltaic power produced by the solar cell 10 based on voltage and current detected in the voltage/current detector 200, determines one of predetermined control modes according to the amount of photovoltaic power and the connection or not of the battery, and controls the first DC/DC converter 110, the second DC/DC converter, and the DC/AC inverter according to the determined control mode.
57 Citations
20 Claims
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1. An apparatus for charging and discharging a photovoltaic PCS integrated battery, comprising:
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a first DC/DC converter that converts PV voltage from a solar cell into a predetermined DC voltage according to a first DC/DC control; a DC/AC inverter that is connected to a system and performs system voltage/DC voltage conversion or DC voltage/system voltage conversion according to a second DC/DC control; a DC link unit that is connected in common to an output terminal of the first DC/DC converter and an output terminal of the DC/AC inverter to stabilize DC voltage from the first DC/DC converter and DC voltage from the DC/AC inverter; a second DC/DC converter that is connected between the DC link unit and a battery to convert voltage bidirectionally according to a second DC/DC control; a voltage/current detector that detects PV voltage/current from the solar cell, battery voltage/current from the battery, system voltage/current from the system, and DC link voltage/current from the DC link unit; and a charging control unit that determines one of a plurality of predetermined control modes based on the voltage and current detected in the voltage/current detector and controls the first DC/DC converter, the second DC/DC converter, and the DC/AC inverter according to the determined control mode. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for charging and discharging a photovoltaic PCS integrated battery applied to a system that includes a first DC/DC converter connected to a solar cell, a DC/AC inverter connected to a system, a DC link unit connected in common to an output terminal of the first DC/DC converter and an output terminal of the DC/AC inverter, and a second DC/DC converter having a bidirectional DC/DC conversion function connected between the DC rink unit and the battery, the method comprising:
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detecting step that detects PV voltage/current detected in a predetermined node, battery voltage/currentt, system voltage/current, and DC link voltage; a state determining step that determines any of predetermined first to fourth operating modes based on the amount of photovoltaic power and the connection or not of the battery by using the PV voltage/current and the battery voltage/current; a first control step that controls the charging of the battery by using the photovaltaic energy of the solar cell in the first operating mode; a second control step that controls the first DC/DC converter, the DC/AC inverter, and the second DC/DC converter to charge the battery by using the photovoltaic energy of the solar cell and the voltage of the system in the second operating mode; and a third control step that controls the first DC/DC converter, the DC/AC inverter, and the second DC/DC converter to charge the battery by using the voltage of the system in a third operating mode. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification