ENERGY STORAGE SYSTEM AND METHOD OF CONTROLLING THE SAME
First Claim
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1. An energy storage system, comprising:
- a maximum power point tracking (MPPT) converter, which converts power generated by a renewable energy generating system and outputs the converted power to a first node;
a bi-directional inverter, which is interposed between the first node and a second node, to which a grid and an AC load are connected, converts a first DC power input via the first node to AC power and outputs the converted AC power to the second node, and converts AC power provided by the grid to the first DC power and outputs the converted first DC power to the first node;
a battery for storing a second DC power;
a bi-directional converter, which is interconnected between the battery and the first node, converts the second DC power output by the battery to the first DC power and outputs the converted first DC power to the bi-directional inverter via the first node, and converts the first DC power output by the bi-directional inverter via the first node to the second DC power and stores the converted second DC power in the battery;
a DC/DC converter, which is interconnected between the bi-directional converter and a DC load and provides DC power to the DC load; and
an integrated controller, which controls the overall operations of the MPPT converter, the bi-directional inverter, the bi-directional converter, and the DC/DC converter.
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Abstract
An energy storage system and a method of controlling the same is provided. The energy storage system may directly provide generated DC power or DC power stored in a battery to a DC load without performing a DC/AC conversion or an AC/DC conversion. Furthermore, in the case where a grid operates abnormally (e.g. power interruption) and the energy storage system functions as an uninterruptible power supply (UPS), power stored in a battery may be selectively provided to loads according to power remaining in a battery, and thus stored power may be used stably.
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Citations
20 Claims
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1. An energy storage system, comprising:
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a maximum power point tracking (MPPT) converter, which converts power generated by a renewable energy generating system and outputs the converted power to a first node; a bi-directional inverter, which is interposed between the first node and a second node, to which a grid and an AC load are connected, converts a first DC power input via the first node to AC power and outputs the converted AC power to the second node, and converts AC power provided by the grid to the first DC power and outputs the converted first DC power to the first node; a battery for storing a second DC power; a bi-directional converter, which is interconnected between the battery and the first node, converts the second DC power output by the battery to the first DC power and outputs the converted first DC power to the bi-directional inverter via the first node, and converts the first DC power output by the bi-directional inverter via the first node to the second DC power and stores the converted second DC power in the battery; a DC/DC converter, which is interconnected between the bi-directional converter and a DC load and provides DC power to the DC load; and an integrated controller, which controls the overall operations of the MPPT converter, the bi-directional inverter, the bi-directional converter, and the DC/DC converter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An energy storage system, comprising:
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a first power converting unit, which converts power generated by a renewable energy generating system to a first power; a second power converting unit, which converts the first power to a second power and stores the second power in a battery and converts the second power stored in the battery to the first power; a third power converting unit, which converts the first power and outputs the converted first power to a first load or a commercial load and converts power provided by the commercial load to the first power; a fourth power converting unit, which is interconnected between the second power converting unit and a second load and converts the first power or the second power to power for driving the second load; and an integrated controller for controlling the first through fourth power converting units. - View Dependent Claims (12, 13, 14)
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15. A method of controlling an energy storage system, which is connected to each of a renewable energy generating system, an AC load or a DC load, and a grid and comprises a maximum power point tracking (MPPT) converter, which converts power generated by a renewable energy generating system and outputs the converted power to a first node;
- a battery for storing power generated by the renewable energy generating system or power provided by the grid;
a bi-directional inverter, which converts power of the first node, outputs the converted power to the AC load or the grid, and converts power provided by the grid and outputs the converted power to the first node;
a bi-directional converter, which converts power of the first node, stores the converted power in the battery, and converts power stored in the battery and outputs the converted power to the first node;
a DC/DC converter, which is interconnected between the bi-directional converter and a DC load and provides DC power to the DC load; and
an integrated controller, the method comprising;converting the generated power or AC power provided by the grid to a first DC power; converting the first DC power or power stored in the battery to a second DC power for driving the DC load; and providing the second DC power to the DC load. - View Dependent Claims (16, 17, 18, 19, 20)
- a battery for storing power generated by the renewable energy generating system or power provided by the grid;
Specification