# US 9,520,623 B2 · Grid-connected power supply system

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- Number: US 9,520,623 B2
- Document ID: US9520623B2
- Status: Granted
- Kind: B2
- Application number: 13/498,462
- Filed: 2010-08-30
- Published: 2012-07-19
- Granted: 2016-12-13
- Earliest claimed: 2009-09-28
- Assignees: Panasonic Intellectual Property Management Co., Ltd.
- Applicants: Masaya Honma; Susumu Kobayasi
- Inventors: Masaya Honma; Susumu Kobayasi
- Web page: https://patentgrep.com/patent/US9520623B2

## CPC

- H01M 10/44: Methods for charging or discharging (circuits for charging H02J7/00)
- H02J 3/32: using batteries or super capacitors with converting means
- H02J 3/381: {Dispersed generators}
- H02J 2101/24: Photovoltaics
- H02J 2101/28: Wind energy
- Y02E 10/56: Power conversion systems, e.g. maximum power point trackers
- Y02E 10/76: Power conversion electric or electronic aspects
- Y02E 60/10: Energy storage using batteries
- Y02E 70/30: Systems combining energy storage with energy generation of non-fossil origin
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H02J: ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

A grid-connected power supply system includes a power generation apparatus configured to generate power by using natural energy and connected in parallel to a commercial power grid; a electricity storage device; and a control device configured. The control device predicts an amount of power to be generated on a subsequent day by the power generation apparatus and a power demand of the loads and charges the electricity storage device with power in a time zone in which an electricity rate of the commercial power grid is relatively low if a predicted value of the amount of power to be generated is lower than a predicted value of the power demand, or does not charge the electricity storage device with power during the time zone if the predicted value of the amount of power to be generated is not lower than the predicted value of the power demand.

## Claims

### Claim 1

A grid-connected power supply system comprising:
a power generation apparatus configured to generate power by using natural energy and connected in parallel to a commercial power grid;
an electricity storage device configured to convert AC power, supplied from the commercial power grid, into converted DC power to charge the electricity storage device, and to convert a discharged DC power into converted AC power and supply the converted AC power to one or more loads; and
a control device configured to control charging and discharging of the electricity storage device; and
a display unit,
wherein the control device predicts an amount of power to be generated on a subsequent day by the power generation apparatus and a power demand of the loads on the subsequent day and charges the electricity storage device with power during a time period in which an electricity rate of the commercial power grid is relatively low if a predicted value of the amount of power to be generated is lower than a predicted value of the power demand, and does not charge the electricity storage device with power during the time period if the predicted value of the amount of power to be generated is not lower than the predicted value of the power demand,
wherein, when the predicted value of the amount of power to be generated is smaller than the predicted value of the power demand, the control device makes a schedule for the power demand of the loads that prevents the predicted value of the amount of power to be generated from being smaller than a scheduled value of the power demand, and presents both the schedule for the power demand of the loads and a schedule for a power demand for a normal day to a user on the display unit at the same time, and
wherein the control device includes a network communications unit and predicts the amount of the power to be generated on the subsequent day by the power generation apparatus based on highest temperature or an amount of predicted solar radiation on the subsequent day which is acquired from the network communications unit.

### Claim 2 (depends on 1)

The grid-connected power supply system of claim 1, wherein the control device discharges power from the electricity storage device during a second time period in which the electricity rate is relatively high.

### Claim 3 (depends on 1)

The grid-connected power supply system of claim 1, further comprising a manipulation reception unit for receiving manipulation input related to the power demand of the loads, wherein the control device predicts the power demand of the loads based on the manipulation input received by the manipulation reception unit.

### Claim 4 (depends on 1)

The grid-connected power supply system of claim 1, wherein the control device compares an amount of power dischargeable from the electricity storage device with the predicted value of the power demand of the loads, and provides notification if it is determined that the amount of the dischargeable power will be less than the power demand of the loads within a predetermined time period.

### Claim 5 (depends on 4)

The grid-connected power supply system of claim 4, wherein the control device has a function of controlling operations of electric devices as the loads, and sequentially controls the operations of the electric devices in order of priority so that power consumption is reduced if it is determined that the amount of the dischargeable power will be smaller than the power demand of the loads within the predetermined time.