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 for converting power generated by a renewable energy generating system and outputting the converted power to a first node;
a bi-directional inverter coupled between the first node and a second node, a grid and a load being coupled to the second node, the bi-directional inverter for converting a first power input via the first node to a second power and outputting the converted second power to the second node, and converting power provided by the grid to the first power and outputting the converted first power to the first node;
a battery for storing a third power;
a bi-directional converter coupled between the battery and the first node, the bi-directional converter for converting the third power output by the battery to the first power and outputting the converted first power to the bi-directional inverter via the first node, and converting the first power output by the bi-directional inverter via the first node to the third power and storing the converted third power in the battery; and
an integrated controller for providing the third power to the load based on a priority order.
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Abstract
A grid-connected energy storage system and a method of controlling the same are disclosed. The energy storage system operates in accordance with a priority order of loads for utilization of power stored in a battery at improved efficiency even in case of an abnormal operation of a grid.
64 Citations
20 Claims
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1. An energy storage system comprising:
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a maximum power point tracking (MPPT) converter for converting power generated by a renewable energy generating system and outputting the converted power to a first node; a bi-directional inverter coupled between the first node and a second node, a grid and a load being coupled to the second node, the bi-directional inverter for converting a first power input via the first node to a second power and outputting the converted second power to the second node, and converting power provided by the grid to the first power and outputting the converted first power to the first node; a battery for storing a third power; a bi-directional converter coupled between the battery and the first node, the bi-directional converter for converting the third power output by the battery to the first power and outputting the converted first power to the bi-directional inverter via the first node, and converting the first power output by the bi-directional inverter via the first node to the third power and storing the converted third power in the battery; and an integrated controller for providing the third power to the load based on a priority order. - 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 converter for converting power generated by a renewable energy generating system to a first power; a second power converter for converting the first power to a second power and storing the second power in a battery and for converting the second power stored in the battery to the first power; a third power converter for converting the first power and outputting the converted first power to a load or a grid and for converting power provided by the grid to the first power; and an integrated controller for controlling the first through third power converters, so that power is selectively provided to the load based on an amount of the second power stored in the battery and a priority order of the load.
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12. A method of controlling an energy storage system coupled to a renewable energy generating system, a load, and a grid, the energy storage system comprising a maximum power point tracking (MPPT) converter for converting a first power generated by the renewable energy generating system and outputting the converted first power to a first node;
- a battery for storing the first power generated by the renewable energy generating system or a second power provided by the grid;
a bi-directional inverter for converting the first power of the first node, for outputting the converted first power to the load or the grid, and for converting the second power provided by the grid and outputting the converted second power to the first node;
a bi-directional converter for converting the first power of the first node for storing the converted first power in the battery, and for converting a third power stored in the battery and outputting the converted third power to the first node; and
an integrated controller, the method comprising;determining whether or not an amount of the third power stored in the battery is above a first critical power amount; providing power to the load regardless of a priority order of the load in the case where the amount of the third power stored in the battery is above the first critical power amount and determining the priority order of the load in the case where the amount of the third power stored in the battery is less than the first critical power amount; and selectively providing power to the load based on the determined priority order of the load. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
- a battery for storing the first power generated by the renewable energy generating system or a second power provided by the grid;
Specification