Systemic optimization of photovoltaic apparatus

Patent metadata

Field	Value
Publication number	US-9819182-B1
Application number	US-201113005482-A
Country	US
Kind code	B1
Filing date	Jan 12, 2011
Priority date	Jan 12, 2010
Publication date	Nov 14, 2017
Grant date	Nov 14, 2017

Abstract

A photovoltaic system may include a first photovoltaic component having local power optimization functionality to process power at a first level, a second photovoltaic component to process power at a second level, and optimization logic to command the first photovoltaic component to accommodate system-level power optimization. The first component may be reconfigurable to accommodate the system-level optimization. The entire system may be dynamically reconfigured to continuously operate at the highest overall level of system efficiency.

First claim

The invention claimed is:

1. A photovoltaic component comprising:
a first power train;
local power optimization functionality configured to control the first power train; and
remote command processing functionality adapted to receive a remote command locally at the photovoltaic component to accommodate active ongoing system-level photovoltaic panel power optimization for a photovoltaic system, by adjusting an operation of the local power optimization functionality, the adjustment instructed by the received remote command and serving to move operation of the first power train away from maximum power point operation of the first power train,
wherein the first power train is connected to a second power train of a separate photovoltaic panel with switches such that the first power train and the second power train are switchable to be connected in series with each other or connected in parallel with each other depending upon the positions of the switches,
wherein system-level photovoltaic panel power optimization comprises centralized power optimization for the photovoltaic system, and
wherein the first power train, the second power train and the separate photovoltaic panel belong to the photovoltaic system.

2. The photovoltaic component of claim 1 where the remote command processing functionality is adapted to adjust the operation of the local power optimization functionality in response to the remote command, the remote command sent from a photovoltaic system-level optimization logic.

3. The photovoltaic component of claim 2 where:
the local power optimization functionality includes local MPPT functionality; and
the remote command processing functionality is adapted to modify the local MPPT functionality.

4. The photovoltaic component of claim 1 further comprising:
a module in communication with a unit maintaining a record of historical operating conditions and the unit configured to predict optimal points under changing environmental power generation conditions.

5. The photovoltaic component of claim 4 where the first power train includes a bypass device and where the unit is in communication with a database storing weather forecasts or seasonal power generation conditions or both.

6. The photovoltaic component of claim 4 where the unit is configured to employ shading models to predict large shading mismatch conditions.

7. The photovoltaic component of claim 1 further comprising functionality configured to turn on the first power train when previously determined mismatch conditions have ceased.

8. The photovoltaic component of claim 1 where the remote command processing functionality includes phase shedding functionality and wherein when a voltage drop is detected the connection between the first power train and a second power train is changed from a parallel connection to a series connection.

9. The photovoltaic component of claim 5 , wherein the bypass device is placed in a bypass mode by the local power optimization functionality.

10. The photovoltaic component of claim 1 , wherein the remote command processing functionality is further adapted to configure the photovoltaic component into a bypass mode.

11. The photovoltaic component of claim 1 , wherein the first power train is connected to the second power train of a second photovoltaic panel with switches such that, the first power train and a first photovoltaic panel or a first string of photovoltaic panels, and the second power train and the second photovoltaic panel or a second string of photovoltaic panels, are switchable between series and parallel connections with each other depending upon the positions of the switches.

12. A method of operating a photovoltaic component, the method comprising:
receiving a remote command at a remote command processing functionality within the photovoltaic component of a first photovoltaic panel or a first string of photovoltaic panels;
adjusting an operation of a local power optimization functionality to move away from a local maximum power point of the photovoltaic component in response to the remote command provided by the remote command processing functionality;
controlling a power train according to the operation of the local power optimization functionality; and
switching from a parallel connection between the photovoltaic component of a first photovoltaic panel or a first string of photovoltaic panels and another photovoltaic component a second photovoltaic panel or a second string of photovoltaic panels to a series connection between the photovoltaic component of the first photovoltaic panel or a first string of photovoltaic panels and another photovoltaic component of the second photovoltaic panel or a second string of photovoltaic panels,
wherein the remote command is generated by a system management component to promote operation of a central system component at a maximum power point for the system.

13. The method of claim 12 wherein the remote command is generated by a system management component to promote operation of a central inverter at a maximum power point for the central inverter.

14. The method of claim 12 ,
wherein the receiving step includes receiving the remote command from an optimization logic, and
wherein the remote command is generated by a system management component to promote operation of a central inverter at a maximum power point for the central inverter and promote local power optimization of the first photovoltaic panel to be moved away from a local maximum power point for the first photovoltaic panel.

15. The method of claim 12 , further comprising reconfiguring the power train using the local power optimization functionality in response to the remote command received by the remote command processing functionality, the reconfiguring including one or more of the following: bypassing a local power optimizer and overriding local maximum power point functionality of the photovoltaic component.

16. The method of claim 12 further comprising:
determining an environmental condition of a system in which the photovoltaic is a part of:
correlating the determined environmental condition to historical measurements of the system; and
optimizing the operation of the system in response to the historical measurements.

17. A photovoltaic component comprising:
a first power train;
local power optimization functionality arranged to control the first power train; and
remote command processing functionality adapted to receive a remote command locally at the photovoltaic component to accommodate system-level photovoltaic panel power optimization by adjusting an operation of the local power optimization functionality,
wherein the first power train is connected to a second power train of a separate photovoltaic panel with switches such that the first power train and the second power train are switchable to be connected in series with each other or connected in parallel with each other depending upon the positions of the switches,
wherein the switches are controlled by optimization logic configured to dynamically provide for connecting, back and forth, the first power train and the second power train either in series or in parallel with each other.

Assignees

• Batten Robert
• Naiknaware Ravindranath
• Sunpower Corp

Inventors

• Batten Robert
• Naiknaware Ravindranath

Classifications

• H02J1/10

  Parallel operation of DC sources · CPC title

• H02J3/38

  Arrangements for feeding a single network from two or more generators or sources in parallel; Arrangements for feeding already energised networks from additional generators or sources in parallel · CPC title

• H02J2101/25

  involving maximum power point tracking control for photovoltaic sources · CPC title

• H02J2101/24

  Photovoltaics · CPC title

• H02J1/102 Primary

  being switching converters (H02J1/108, H02J1/12 take precedence) · CPC title