Storage-battery control device, storage-battery charge/discharge system, photovoltaic power generation system, and storage-battery control method

Patent metadata

Field	Value
Publication number	US-10355517-B2
Application number	US-201615579238-A
Country	US
Kind code	B2
Filing date	May 25, 2016
Priority date	Jun 22, 2015
Publication date	Jul 16, 2019
Grant date	Jul 16, 2019

Abstract

The present invention provides a storage-battery control device 1 capable of enhancing economical efficiency by controlling charge state of a storage battery 12 so that surplus power generated by photovoltaic generation can be entirely charged into the storage battery 12 even in a case where power cannot be sold to a system power supply 50. A storage-battery control device 1 according to the present invention includes a load-power prediction device 4 to predict load power, a PV-power prediction device 3 to predict generated power by photovoltaic power generation, and a system controller 2 to obtain a predicted charge amount that is calculated by subtracting the generated power amount being a summation of the generated power in a prediction segment 60 having a start point set at a predetermined time, from the load power amount being a summation of the load power in the prediction segment 60, and when the predicted charge amount is positive, to control the charge state of a storage battery 12 at the start point so that the predicted charge amount can be charged in the prediction segment 60, wherein an end point of the prediction segment 60 is a time at which the generated power by photovoltaic power generation is predicted to become equal to the load power after reaching the maximum value of the generated power.

First claim

The invention claimed is:

1. A storage-battery control device comprising:
a load-power prediction device to predict load power required for a load;
a PV-power prediction device to predict generated power by photovoltaic power generation; and
a system controller to obtain a predicted charge amount that is calculated by subtracting the generated power amount being a summation of the generated power in a prediction segment having a start point set at a predetermined time, from the load power amount being a summation of the load power in the prediction segment, and when the predicted charge amount is positive, to control a charge state of a storage battery at the start point so that the predicted charge amount can be charged in the prediction segment, and when the predicted charge amount is negative or zero, to control the charge state of the storage battery at the start point to be a full charge state by charging the storage battery,
wherein an end point of the prediction segment is a time at which the generated power by photovoltaic power generation is predicted to become equal to the load power after reaching a maximum value of the generated power.

2. A storage-battery control device comprising:
a load-power prediction device to predict load power required for a load;
a PV-power prediction device to predict generated power by photovoltaic power generation; and
a system controller to obtain a predicted charge amount that is calculated by subtracting the generated power amount being a summation of the generated power in a prediction segment having a start point set at a predetermined time, from the load power amount being a summation of the load power in the prediction segment, and when the predicted charge amount is positive, to control a charge state of a storage battery at the start point so that the predicted charge amount can be charged in the prediction segment, and when the predicted charge amount is negative or zero, to control the charge state of the storage battery by the start point to be close to a full charge state by charging the storage battery,
wherein an end point of the prediction segment is a time at which the generated power by photovoltaic power generation is predicted to become equal to the load power after reaching a maximum value of the generated power.

3. The storage-battery control device according to claim 1 , wherein, during the prediction segment, the system controller discharges the storage battery in a first segment in which the generated power is predicted to increase from the start point and become equal to the load power at its end point, and the system controller charges the storage battery with all of surplus power which is calculated by subtracting the load power from the generated power in a second segment from the end point of the first segment to a time at which the generated power is predicted to decrease and become equal to the load power.

4. The storage-battery control device according to claim 2 , wherein, during the prediction segment, the system controller discharges the storage battery in a first segment in which the generated power is predicted to increase from the start point and become equal to the load power at its end point, and the system controller charges the storage battery with all of surplus power which is calculated by subtracting the load power from the generated power in a second segment from the end point of the first segment to a time at which the generated power is predicted to decrease and become equal to the load power.

5. The storage-battery control device according to claim 1 , wherein the PV-power prediction device adopts a maximum value, from among generated power amounts predicted from weather information, as a predicted value of the generated power amount by the photovoltaic power generation in the prediction segment.

6. The storage-battery control device according to claim 2 , wherein the PV-power prediction device adopts a maximum value, from among generated power amounts predicted from weather information, as a predicted value of the generated power amount by the photovoltaic power generation in the prediction segment.

7. The storage-battery control device according claim 1 , wherein the load-power prediction device adopts a minimum value, from among load power amounts predicted from a date and time or a day of week, as the predicted value of the load power amount in the prediction segment.

8. The storage-battery control device according claim 2 , wherein the load-power prediction device adopts a minimum value, from among load power amounts predicted from a date and time or a day of week, as the predicted value of the load power amount in the prediction segment.

9. The storage-battery control device according to claim 7 , further comprising a learning device to correct, by using actually measured load power, a load pattern corresponding to the date and time or the day of week held in the load-power prediction device.

10. A storage-battery charge/discharge system comprising:
the storage-battery control device according to claim 1 ; and
a power storage device including the storage battery and a power conditioner for the storage battery to convert power to DC power or AC power in charging and discharging the storage battery.

11. A storage-battery charge/discharge system comprising:
the storage-battery control device according to claim 2 ; and
a power storage device including the storage battery and a power conditioner for the storage battery to convert power to DC power or AC power in charging and discharging the storage battery.

12. A photovoltaic power generation system comprising:
the storage-battery charge/discharge system according to claim 10 , and
a photovoltaic power generation device including a solar panel being a panel to perform the photovoltaic power generation and a power conditioner for PV to convert power generated by the solar panel from DC power to AC power.

13. A storage-battery control method comprising:
predicting load power required for a load in a load-power prediction device;
predicting generated power by photovoltaic power generation in a PV-power prediction device; and
obtaining in a system controller a predicted charge amount that is calculated by subtracting the generated power amount being a summation of the generated power in a prediction segment having a start point set at a predetermined time, from the load power amount being a summation of the load power in the prediction segment, and when the predicted charge amount is positive, controlling a charge state of a storage battery at the start point so that the predicted charge amount can be charged in the prediction segment, and when the predicted charge amount is negative or zero, controlling the charge state of the storage battery at the start point to be a full charge state by charging the storage battery,
wherein an end point of the prediction segment is a time at which the generated power by photovoltaic power generation is predicted to become equal to the load power after reaching a maximum value of the generated power.

14. A storage-battery control method comprising:
predicting load power required for a load in a load-power prediction device;
predicting generated power by photovoltaic power generation in a PV-power prediction device; and
obtaining in a system controller a predicted charge amount that is calculated by subtracting the generated power amount being a summation of the generated power in a prediction segment having a start point set at a predetermined time, from the load power amount being a summation of the load power in the prediction segment, and when the

Assignees

• Mitsubishi Electric Corp

Inventors

• Hara Satoshi
• Kise Makiko
• Aihara Shigeru
• Nishiguchi Hiroto
• Ida Takahito
• Takegami Tomoki

Classifications

• H02J3/003 Primary

  Load forecast, e.g. methods or systems for forecasting future load demand · CPC title

• H02S40/38

  Energy storage means, e.g. batteries, structurally associated with PV modules · CPC title

• H01M10/44

  Methods for charging or discharging (circuits for charging H02J7/00) · CPC title

• H02S40/32

  comprising DC/AC inverter means associated with the PV module itself, e.g. AC modules · CPC title

• Y02E70/30

  Systems combining energy storage with energy generation of non-fossil origin · CPC title