Lars R Johnson
Land Surveyors in Concord, CA
License number
Utah 2774467-E202
Category
Engineer/Land Surveyor
Type
Engineer Exam - Obsolete
Address
Address
Concord, CA
Personal information
See more information about Lars R Johnson at radaris.comName
Address
Phone
PO Box 540, Ventura, CA 93002
9017 Winters Rd, Winters, CA 95694
8700 E Cloudview Way, Anaheim, CA 92808
7557 Newcastle Dr, Cupertino, CA 95014
17 N Lanoitan Ave, National City, CA 91950
Professional information
See more information about Lars R Johnson at trustoria.com
Methods And Apparatus For Controlling Operation Of Photovoltaic Power Plants
Methods And Apparatus For Controlling Operation Of Photovoltaic Power Plants
US Patent:
2012032, Dec 27, 2012
Filed:
Jun 27, 2011
Appl. No.:
13/169978
Inventors:
Lars JOHNSON - Concord CA, US
International Classification:
H02J 3/38
US Classification:
307 52
Abstract:
A photovoltaic power plant includes a photovoltaic inverter that converts direct current generated by solar cells to alternating current. The output of the photovoltaic inverter is provided to a point of interconnection to a power grid. A meter at the point of interconnection may be read to detect the output of the photovoltaic inverter at the power grid. The photovoltaic power plant includes a plant controller with a state machine. The plant controller is configured to adjust setpoints of the photovoltaic inverter to control the output of the photovoltaic power plant. The plant controller is also configured to soft start and soft stop automatic voltage regulation (AVR) of the photovoltaic power plant to prevent perturbing the AVR.
Automatic Voltage Regulation For Photovoltaic Systems
Automatic Voltage Regulation For Photovoltaic Systems
US Patent:
2012023, Sep 20, 2012
Filed:
Mar 14, 2011
Appl. No.:
13/047005
Inventors:
Lars JOHNSON - Concord CA, US
Robert JOHNSON - Mill Valley CA, US
Robert JOHNSON - Mill Valley CA, US
International Classification:
H02J 3/18, H02M 7/42
US Classification:
307 82, 363 71
Abstract:
A photovoltaic system includes solar cells and photovoltaic inverters configured to convert direct current generated by the solar cells to alternating current. Grid voltage at the point of interconnection (POI) of the photovoltaic system and the power grid is measured and compared to a setpoint. A control signal is generated based on the measured grid voltage. The control signal is provided to the photovoltaic inverters. The control signal is adjusted to cause the photovoltaic inverters to generate or absorb reactive power to respond to transient grid voltage changes.