SYSTEM FOR CHARGING BATTERY OF ENERGY STORAGE SYSTEM USING PCS

• US 20150270732A1
• Filed: 02/24/2015
• Published: 09/24/2015
• Est. Priority Date: 03/20/2014
• Status: Active Grant

• Current Assignee: LSIS Co. Ltd. (LS Corporation)
• Original Assignee: LSIS Co. Ltd. (LS Corporation)
• Inventors: PARK, Tae Bum
• Granted Patent: US 9,899,851 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H02J 2300/24 of photovoltaic origin
• CPC Class Codes: H02J 3/381 Dispersed generators
• CPC Class Codes: H02J 7/00 Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
• CPC Class Codes: H02J 7/007 Regulation of charging or discharging current or voltage
• CPC Class Codes: H02J 7/04 Regulation of charging current or voltage
• CPC Class Codes: H02J 7/35 with light sensitive cells
• CPC Class Codes: Y02E 10/56 Power conversion systems, e.g. maximum power point trackers
• CPC Class Codes: Y02E 70/30 Systems combining energy storage with energy generation of non-fossil origin

Abstract

A system for charging a battery of an energy storage system using a photovoltaic inverter, includes: a photovoltaic inverter configured to convert a DC power generated from a photovoltaic module into an AC power, and to output the AC power; and an energy storage system configured to set a preset power value by considering an output power of the photovoltaic inverter according to the amount of solar radiation, and configured to charge a battery in a mode selected from a constant current (CC) mode and a constant voltage (CV) mode based on a comparison result obtained by comparing the preset power value, with an input power generated from the photovoltaic module and input from the photovoltaic inverter.

Claims

1. A system for charging a battery of an energy storage system using a photovoltaic inverter, the system comprising:

a photovoltaic inverter configured to convert a DC power generated from a photovoltaic module into an AC power, and to output the AC power; and

an energy storage system configured to set a preset power value by considering an output power of the photovoltaic inverter according to the amount of solar radiation, and configured to charge a battery in a mode selected from a constant current (CC) mode and a constant voltage (CV) mode based on a comparison result obtained by comparing the preset power value, with an input power generated from the photovoltaic module and input from the photovoltaic inverter,

wherein the energy storage system includes;

a current measuring unit configured to measure an input current;

a voltage measuring unit configured to measure an input voltage;

a controller configured to calculate an input power based on the input current and the input voltage measured by the current measuring unit and the voltage measuring unit, respectively, configured to compare the input power with the preset power value, and configured to output a charging control signal according to the CC mode when the input power is equal to or more than the preset power value, and configured to output a charging control signal according to the CV mode when the input power is less than the preset power value; and

a charging unit configured to charge the battery, by supplying the input power provided from the photovoltaic inverter to the battery in the CC mode or in the CV mode, by the charging control signal generated from the controller.

2. The system of claim 1, wherein the controller is configured to charge the battery in a CV mode when the input power is increased as time lapses, and to charge the battery in a CC mode when the input power is equal to or more than the preset power value.

3. The system of claim 1, wherein the controller is configured to charge the battery in a CC mode when the input power is decreased as time lapses, and to charge the battery in a CV mode when the input power is less than the preset power value.

4. The system of claim 1, wherein the controller is configured to charge the battery in a CV mode when the input power is increased and decreased as time lapses, to charge the battery in a CC mode when the input power is equal to or more than the preset power value, and to charge the battery in a CV mode when the input power is less than the preset power value.