System and method for enhanced watch dog in solar panel installations

• US 10,256,770 B2
• Filed: 09/27/2017
• Issued: 04/09/2019
• Est. Priority Date: 11/02/2007
• Status: Active Grant

• Current Assignee: Tigo Energy, Inc
• Original Assignee: Tigo Energy, Inc
• Inventors: Hadar, Ron, Arditi, Shmuel, Bickford, James
• Primary Examiner(s): Deberadinis, Robert
• Application Number:
  US15/717,244
• Publication Number:
  US 20180019705A1
• Time in Patent Office: 559 Days
• CPC Class Codes: G01R 31/00 Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere measuring superconductive properties G01R33/1238; testing or measuring semiconductors or solid state devices during manufacture H01L22/00; testing line transmission systems H04B3/46
• CPC Class Codes: H01L 31/02021 for solar cells electrical connection means, e.g. junction boxes, specially adapted for structural association with photovoltaic modules H02S40/34
• CPC Class Codes: H02J 3/38 Arrangements for parallely feeding a single network by two or more generators, converters or transformers
• CPC Class Codes: H02S 50/00 Monitoring or testing of PV systems, e.g. load balancing or fault identification
• CPC Class Codes: H02S 50/10 Testing of PV devices, e.g. of PV modules or single PV cells testing of semiconductor devices during manufacturing H01L22/00
• CPC Class Codes: H04B 2203/5458 Monitor sensor; Alarm systems
• CPC Class Codes: Y02E 10/50 Photovoltaic [PV] energy
• CPC Class Codes: Y02E 10/56 Power conversion systems, e.g. maximum power point trackers

Abstract

A system and method for automated shutdown, disconnect, or power reduction of solar panels. A system of solar panels includes one or more master management units (MMUs) and one or more local management units (LMUs). The MMUs are in communication with the LMUs with the MMUs and LMUs “handshaking” when the system is in operation. The MMUs are connected to one or more controllers which in turn are connected to emergency detection sensors. Upon a sensor detection of an emergency, the associated MMU is notified which in turn instructs associated LMUs to take appropriate action. In the event that communication with the MMUs has been cut off, the LMUs take the initiative to shut down, disconnect, or reduce the output of associated string(s) of solar panels.

Claims

1. A photovoltaic panel, comprising:

at least one photovoltaic cell;

a local unit configured on the photovoltaic panel, the local unit having;

a voltage regulator coupled to the at least one photovoltaic cell to receive electric power generated by the at least one photovoltaic cell; and

a controller coupled to the voltage regulator;

wherein the voltage regulator provides a power output of the photovoltaic panel using the electric power generated by the at least one photovoltaic cell;

wherein the controller communicates with a remote unit, disposed at a location remote from the local unit, to control operations of the voltage regulator;

wherein a sensor is monitored for an anomaly; and

wherein in response to a determination that the sensor has detected the anomaly, the controller causes the voltage regulator to shut down the power output of the photovoltaic panel based on a communication with the remote unit.

2. The photovoltaic panel of claim 1, wherein the remote unit and the sensor are connected in a network.

3. The photovoltaic panel of claim 2, wherein the remote unit monitors queries from the sensor for the anomaly.

4. The photovoltaic panel of claim 2, wherein the remote unit receives, from the sensor, notifications of the anomaly.

5. The photovoltaic panel of claim 2, wherein in response to the anomaly, the communication includes a command selected from the group consisting of:

a command to shut down; and

a command to disconnect.

6. The photovoltaic panel of claim 1, wherein the communication causes the voltage regulator to shut down the power output of the photovoltaic panel and wait for a restart signal.

7. The photovoltaic panel of claim 6, wherein after the voltage regulator shuts down the power output of the photovoltaic panel, the voltage regulator continues to provide a voltage to power the controller.

8. The photovoltaic panel of claim 6, wherein when the voltage regulator shuts down the power output of the photovoltaic panel, a switch of the voltage regulator shorts the power output of the photovoltaic panel.

9. The photovoltaic panel of claim 6, wherein when the voltage regulator shuts down the power output of the photovoltaic panel, a switch of the voltage regulator disconnects a circuit path between an output line of the voltage regulator and an output terminal of the photovoltaic panel.

10. The photovoltaic panel of claim 6, wherein the controller causes the voltage regulator to shut down the power output of the photovoltaic panel in response to a predetermined number of skips of heartbeat signals from the remote unit.

11. The photovoltaic panel of claim 10, wherein when skips of heartbeat signals from the remote unit that are less than the predetermined number, the controller does not cause the voltage regulator to shut down the power output of the photovoltaic panel.

12. A photovoltaic panel, comprising:

at least one photovoltaic cell;

a local unit configured on the photovoltaic panel, the local unit having;

a voltage regulator coupled to the at least one photovoltaic cell to receive electric power generated by the at least one photovoltaic cell; and

a controller coupled to the voltage regulator;

wherein the voltage regulator provides a power output of the photovoltaic panel using the electric power generated by the at least one photovoltaic cell;

wherein the controller communicates with a remote unit, disposed at a location remote from the local unit, to control operations of the voltage regulator;

wherein the controller detects an anomaly in heartbeat signals from the remote unit; and

wherein in response to the anomaly, the controller causes the voltage regulator to reduce the power output of the photovoltaic panel.

13. The photovoltaic panel of claim 12, wherein the anomaly includes skips of heartbeat signals.

14. The photovoltaic panel of claim 13, wherein the controller causes the voltage regulator to reduce the power output of the photovoltaic panel when the anomaly includes a predetermined number of skips of the heartbeat signals.

15. The photovoltaic panel of claim 14, wherein when skips of the heartbeat signals are less than the predetermined number, the controller does not cause the voltage regulator to reduce the power output of the photovoltaic panel.

16. The photovoltaic panel of claim 13, wherein the remote unit causes the skips in response to a notification from a sensor.

17. The photovoltaic panel of claim 13, wherein the remote unit causes the skips in response to a response from a sensor responsive to an anomaly query.

18. A method comprising:

generating, by photovoltaic cells of a photovoltaic panel, electric power; and

regulating, by a voltage converter of the photovoltaic panel, the electric power generated by the photovoltaic cells of the photovoltaic panel to provide a power output of the photovoltaic panel;

communicating with, by a controller of the photovoltaic panel, a remote unit disposed at a location remote from the photovoltaic panel, including receiving heartbeat signals from the remote unit;

detecting an anomaly in the heartbeat signals from the remote unit; and

in response to the anomaly, causing, by the controller, the voltage regulator to reduce the power output of the photovoltaic panel.

19. The method of claim 18, wherein the anomaly includes skips of heartbeat signals.

20. The method of claim 19, wherein the causing of the voltage regulator to reduce the power output of the photovoltaic panel is in response to a determination that a count of the skips of heartbeat signals is about a threshold.