GRID-INTERACTIVE PHOTOVOLTAIC GENERATION SYSTEM WITH POWER QUALITY CONTROL AND ENERGY SAVING

• US 20110088748A1
• Filed: 06/11/2008
• Published: 04/21/2011
• Est. Priority Date: 05/30/2008
• Status: Active Grant

• Current Assignee: Industry-Academic Cooperation Foundation, Kunsan National University (Kunsan National University)
• Original Assignee: Kunsan National University Industry-Academy Cooper
• Inventors: Lee, Seong Ryong
• Granted Patent: US 8,880,229 B2
• Time in Patent Office: Days
• US Class Current: 136/244
• CPC Class Codes: H02J 2300/24 of photovoltaic origin
• CPC Class Codes: H02J 3/1814 wherein al least one reactive element is actively controlled by a bridge converter, e.g. unified power flow controllers [UPFC]
• CPC Class Codes: H02J 3/1842 wherein at least one reactive element is actively controlled by a bridge converter, e.g. active filters
• CPC Class Codes: H02J 3/381 Dispersed generators
• CPC Class Codes: H02J 3/46 Controlling of the sharing of output between the generators, converters, or transformers
• CPC Class Codes: H02M 1/0093 wherein the output is created by adding a regulated voltage to or subtracting it from an unregulated input
• CPC Class Codes: H02M 5/293 using semiconductor devices only
• CPC Class Codes: Y02E 10/56 Power conversion systems, e.g. maximum power point trackers
• CPC Class Codes: Y02E 40/10 Flexible AC transmission systems [FACTS]
• CPC Class Codes: Y02E 40/20 Active power filtering [APF]
• CPC Class Codes: Y10S 323/906 Solar cell systems

Abstract

Disclosed here is a grid-interactive photovoltaic generation system having power quality improvement and power saving functions. The grid-interactive photovoltaic generation system includes a solar cell array, a first inverter, and a second inverter. The solar cell array receives solar light and generates predetermined power. The first inverter converts the power, generated by the solar cell array, into power required by a grid line. The second inverter is connected to the first inverter, and steps down power, which will be supplied to a load, to an appropriate voltage.

Claims

1. A grid-interactive photovoltaic generation system having power quality improvement and power saving functions, comprising:

a solar cell array for receiving solar light and generating predetermined power;

a first inverter for converting the power, generated by the solar cell array, into power required by a grid line; and

a second inverter connected to the first inverter, and configured to step down power, which will be supplied to a load, to an appropriate voltage.

2. The grid-interactive photovoltaic generation system as set forth in claim 1, wherein the first inverter is a Current Controlled Voltage Source Inverter (CCVSI) that is connected to a grid input power source.

3. The grid-interactive photovoltaic generation system as set forth in claim 1, wherein the second inverter is a Voltage Controlled Voltage Source Inverter (VCVSI) that is connected in parallel between a power source and a load.

4. The grid-interactive photovoltaic generation system as set forth in claim 1, further comprising a Maximum Power Point Tracking (MPPT)-Power Quality Control (PQC) integrated controller for performing control:

in a nighttime mode of performing PQC in order to output high-quality power to the grid by controlling operation of the first inverter during a nighttime during which there is no solar light; and

in a daytime mode of simultaneously performing both PQC and MPPT during a daytime during which there is solar light.

5. The grid-interactive photovoltaic generation system as set forth in claim 1, further comprising a voltage controller for controlling operation of the second inverter.