Distributed grid-interactive photovoltaic-based power dispatching

• US 8,352,091 B2
• Filed: 01/02/2009
• Issued: 01/08/2013
• Est. Priority Date: 01/02/2009
• Status: Expired due to Fees

• Current Assignee: International Business Machines Corporation
• Original Assignee: International Business Machines Corporation
• Inventors: Haugh, Julianne F.
• Primary Examiner(s): Ali, Mohammad
• Assistant Examiner(s): Booker, Kelvin
• Application Number:
  US12/348,042
• Publication Number:
  US 20100174418A1
• Time in Patent Office: 1,467 Days
• Field of Search: 700286-291, 700295-298, 705/412
• US Class Current: 700/286
• CPC Class Codes: G06F 1/26 Power supply means, e.g. regulation thereof for memories G11C
• CPC Class Codes: H02J 2300/24 of photovoltaic origin
• CPC Class Codes: H02J 3/381 Dispersed generators
• CPC Class Codes: H02J 3/466 Scheduling the operation of the generators, e.g. connecting or disconnecting generators to meet a given demand
• CPC Class Codes: H02J 7/35 with light sensitive cells
• CPC Class Codes: Y02E 10/56 Power conversion systems, e.g. maximum power point trackers

Abstract

In one embodiment, each of a plurality of sites may produce surplus power. All or a fraction of the surplus power may be supplied to the power grid according to an agreement between the user of a site and an electric utility. A computer of the utility is in communication with a computer at each of a plurality of sites having a local power source. Terms of power provision that include an amount of power to be provided during a specified time of day is communicated between a site and the utility.

Claims

1. A system for using power from distributed, renewable power sources located at sites coupled to a power grid of a utility and also coupled to a computer communications network, comprising:

a renewable power source at a site coupled to the power grid, wherein the renewable power source generates electrical power from a renewable energy source at the site;

a charge controller to receive the electrical power from the renewable power source and adjust the output via a DC to DC converter, wherein the electrical power varies in voltage and current, wherein the output is a nominal DC voltage, wherein the output is lowered to the nominal DC voltage in response to the electrical power comprising a high voltage, and wherein the output is raised to the nominal DC voltage in response to the electrical power comprising a low voltage;

a computer at the site, wherein the computer at the site is in communication with a computer at a utility plant through the computer communications network, and wherein the computer at the site is to control an amount of power delivered from the site to the power grid by controlling an output AC voltage of a converter; and

the converter for producing an output AC voltage and an output AC current that is a function of the output AC voltage to deliver power to the power grid derived from electrical power produced by the renewable power source and adjusted by the charge controller, wherein the power delivered to the power grid increases as the output AC voltage increases and decreases as the output AC voltage decreases, wherein the computer at the site is further to receive proposed terms of power provision from the utility via the computer at the utility and to enable a user of the site to accept or reject the received proposed terms, and wherein the amount of power provided to the power grid during a specified time of day is determined according to an agreement between a user of the site and the utility.

2. The system of claim 1, further comprising a consumer power monitor at the site to monitor an amount of power delivered to the site.

3. The system of claim 1, further comprising a grid power monitor at the site to monitor the power delivered to or received from the power grid.

4. The system of claim 1, further comprising a charge monitor and one or more batteries, the charge monitor to monitor a charge on the batteries.

5. The system of claim 1, wherein the computer at the site is further to enable a user of the site to propose terms of power provision to the utility.

6. The system of claim 1, wherein the computer is further to determine an amount of power delivered to the power grid and report the determined amount of power to the utility.