Method for calculating solar radiation amount and method for determining power to be supplied

Patent metadata

Field	Value
Publication number	US-9535135-B2
Application number	US-201314075362-A
Country	US
Kind code	B2
Filing date	Nov 8, 2013
Priority date	Nov 14, 2012
Publication date	Jan 3, 2017
Grant date	Jan 3, 2017

Abstract

A method for calculating a solar radiation amount is provided, which enables the prediction of a solar radiation amount with consideration also given to the small movement of a cloud that affects a power generation amount generated by a PV array and thereby improves the accuracy of prediction of the power generation amount generated by the PV array. From a measured output value of a solar panel, solar radiation and a temperature parameter are extracted. An output of a PV is calculated from the extracted solar radiation and temperature parameter. The calculated value is correlated with the measured value. A temperature correction coefficient is obtained so that a correlation coefficient is highest, and a solar radiation amount is calculated using the obtained correlation coefficient.

First claim

What is claimed is:

1. A method for calculating a solar radiation amount, comprising an information processor collecting a power value generated by a photovoltaic (PV) array and output from a power conditioner of an emergency management system (EMS) unit, and storing the power value in a storage unit for:
calculating a first solar radiation amount and a panel temperature based on a measured power value of a solar panel;
calculating a first temperature correction coefficient;
calculating a power value of the solar panel based on the first solar radiation amount, the panel temperature, and the temperature correction coefficient;
calculating a correlation coefficient by comparing the measured power value and the calculated power value of the solar panel;
determining whether the correlation coefficient has a highest value;
adjusting, based on the determination, the first temperature correction coefficient to a second temperature correction coefficient so that the correlation coefficient has the highest value;
calculating an outside air temperature based on the panel temperature using the second temperature correction parameter corresponding to the correlation coefficient having the highest value;
calculating a second solar radiation amount based on the calculated outside air temperature; and
using the second solar radiation amount to perform energy management on an EMS associated with the solar panel.

2. A method for determining power to be supplied to an emergency management system (EMS) comprising an information processor collecting a power value generated by a photovoltaic (PV) array and output from a power conditioner of an EMS unit, and storing the power value in a storage unit for:
receiving, from the EMS, a measured power value of a solar panel;
calculating a first solar radiation amount and a panel temperature based on the measured power value of the solar panel;
calculating a first temperature correction coefficient;
calculating a power value of the solar panel based on the first solar radiation amount, the panel temperature, and the temperature correction coefficient;
calculating a correlation coefficient by comparing the measured power value and the calculated power value of the solar panel;
determining whether the correlation coefficient has a highest value;
adjusting based on the determination, the first temperature correction coefficient to a second temperature correction so that the correlation coefficient has the highest value;
calculating an outside air temperature based on the panel temperature using the second temperature correction parameter corresponding to the correlation coefficient having the highest value;
calculating a second solar radiation amount based on the calculated outside air temperature; and
determining, according to the second solar radiation amount, power to be supplied to the EMS and using the determined power to perform energy management on the EMS.

Assignees

• Hitachi Ltd

Inventors

• Fujimori Masaaki
• Kohno Tohru

Classifications

• H02S50/10 Primary

  Testing of PV devices, e.g. of PV modules or single PV cells (testing of semiconductor devices during manufacturing {H10P74/00}) · CPC title

• G01R31/69 Primary

  of terminals at the end of a cable or a wire harness; of plugs; of sockets, e.g. wall sockets or power sockets in appliances · CPC title

• G01R31/405 Primary

  Physics · mapped topic

• Y02E10/50

  Photovoltaic [PV] energy · CPC title