ENERGY STORAGE SYSTEM AND METHOD OF CONTROLLING THE SAME
First Claim
1. An energy storage system comprising:
- a maximum power point tracking (MPPT) converter converting power generated by a renewable power generation system and outputting the converted power to a first node;
a bi-directional inverter, connected between the first node and a second node, the second node being connected to a grid and a load, converting a first direct current (DC) power input through the first node to an alternating current (AC) power and outputting the AC power to the second node, and converting an AC power from the grid to the first DC power and outputting the first DC power to the first node;
a battery for storing a second DC power;
a bi-directional converter, connected between the battery and the first node, converting the second DC power output from the battery to the first DC power and outputting the first DC power to the bi-directional inverter through the first node, and converting the first DC power output from the bi-directional inverter through the first node to the second DC power; and
an integrated controller sensing an electrical failure signal of the grid and controlling the second DC power stored in the battery to be transferred to the load when the electrical failure signal is received.
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Accused Products
Abstract
A grid-connected energy storage system and a method of controlling the energy storage system. In the energy storage system, a normal operation of the energy storage system and the UPS function due to electrical failure may be stably performed even if electrical failure occurs. The energy storage system includes: a maximum power point tracking (MPPT) converter outputting converted power to a first node; a battery storing power; a bi-directional inverter converting power and outputting the converted power to the load, the grid or the first node; a bi-directional converter converting and storing power in the battery and outputting the power stored in the battery to the first node; and an integrated controller controlling the MPPT converter, the bi-directional inverter and the bi-directional converter.
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Citations
18 Claims
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1. An energy storage system comprising:
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a maximum power point tracking (MPPT) converter converting power generated by a renewable power generation system and outputting the converted power to a first node; a bi-directional inverter, connected between the first node and a second node, the second node being connected to a grid and a load, converting a first direct current (DC) power input through the first node to an alternating current (AC) power and outputting the AC power to the second node, and converting an AC power from the grid to the first DC power and outputting the first DC power to the first node; a battery for storing a second DC power; a bi-directional converter, connected between the battery and the first node, converting the second DC power output from the battery to the first DC power and outputting the first DC power to the bi-directional inverter through the first node, and converting the first DC power output from the bi-directional inverter through the first node to the second DC power; and an integrated controller sensing an electrical failure signal of the grid and controlling the second DC power stored in the battery to be transferred to the load when the electrical failure signal is received. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of controlling an energy storage system supplying power to a load when an electrical failure occurs in a grid, wherein the energy storage system is connected to a renewable power generation system, the load, and the grid and the energy storage system includes:
- a maximum power point tracking (MPPT) converter outputting converted power to a first node;
a battery storing power;
a bi-directional inverter converting power and outputting the converted power to the load, the grid or the first node;
a bi-directional converter converting and storing power in the battery and outputting the power stored in the battery to the first node; and
an integrated controller, the method comprising;receiving an electrical failure signal of the grid; turning the MPPT converter and the bi-directional inverter off; turning the bi-directional converter on; performing constant voltage control of the first node to stabilize the first node; turning the bi-directional inverter on; and supplying the power stored in the battery to the load. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
- a maximum power point tracking (MPPT) converter outputting converted power to a first node;
Specification