DISTRIBUTED MAXIMUM POWER POINT TRACKING SYSTEM, STRUCTURE AND PROCESS

• US 20100286836A1
• Filed: 07/23/2010
• Published: 11/11/2010
• Est. Priority Date: 03/27/2007
• Status: Active Grant

• Current Assignee: Solaredge Technologies Incorporated
• Original Assignee: Newdoll Enterprises LLC
• Inventors: SHAVER, Argil E. II, Newdoll, Ronald M.
• Granted Patent: US 8,035,249 B2
• Time in Patent Office: Days
• US Class Current: 700/287
• 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: H02H 9/041 using a short-circuiting device
• CPC Class Codes: H02J 2300/26 involving maximum power point tracking control for photovoltaic sources maximum power point systems in particular G05F1/67
• CPC Class Codes: H02J 3/38 Arrangements for parallely feeding a single network by two or more generators, converters or transformers
• CPC Class Codes: H02J 3/381 Dispersed generators
• CPC Class Codes: Y02A 30/60 Planning or developing urban green infrastructure
• CPC Class Codes: Y02E 10/56 Power conversion systems, e.g. maximum power point trackers

Abstract

Distributed maximum power point tracking systems, structures, and processes are provided for power generation structures, such as for but not limited to a solar panel arrays. In an exemplary solar panel string structure, distributed maximum power point tracking (DMPPT) modules are provided, such as integrated into or retrofitted for each solar panel. The DMPPT modules provide panel level control for startup, operation, monitoring, and shutdown, and further provide flexible design and operation for strings of multiple panels. The strings are typically linked in parallel to a combiner box, and then toward and enhanced inverter module, which is typically connected to a power grid. Enhanced inverters are controllable either locally or remotely, wherein system status is readily determined, and operation of one or more sections of the system are readily controlled. The system provides increased operation time, and increased power production and efficiency, over a wide range of operating conditions.

Claims

1. A power generation system, comprising:

a server;

a plurality of power panels, each comprising

a control module comprising input connections, output connections, a signal processing circuit connected to the input connections and to the output connections, and a controller connected to the signal processing circuit,

a plurality of DC power cells connected to the input connections of the control module;

at least one inverter having input DC terminals, output AC terminals, and an inverter circuit connected to the input DC terminals and output AC terminals; and

communications links between the server and the controllers;

wherein the DC output of one or more of the power panels is controllably adjustable in response to input signals sent from the server and received at the control modules over the communications links.

2. The system of claim 1, wherein the DC output of one or more of the power panels is controllably adjustable for any of

providing the same output DC voltage from each of the power panels;

increasing the total power output of the system;

or

increasing the total efficiency of the system.

3. The system of claim 1, wherein the at least one of the input signals sent from the server and received at the control modules comprises a control signal for a string comprising a plurality of the power panels, and wherein one or more of the power panels within the string are controllably adjustable in response to the control signal and to local values of any of voltage, current or temperature, to provide any of increased total power output of the string or decreasing mismatch between the power panels of the string.

4. The system of claim 1, wherein the DC output of one or more of the power panels is controllably adjustable to reduce power transmission losses from the array to the at least one inverter.

5. The system of claim 1, wherein an output signal produced at least one of the signal processing circuits has a voltage that is higher than a voltage of an input signal provided by the respective power panels.

6. The system of claim 1, wherein the power panels comprise solar panels, fuel cells, or batteries.

7. The system of claim 1, wherein the communication links between the server and each of the control modules comprise any of wired communication links and wireless communication links.

8. The system of claim 1, wherein the control modules further comprise means for sending data signals to the server over the communication links.

9. The system of claim 8, wherein the data signals comprise any of input voltage data, input current data, output voltage data, output current data, temperature data, or insolation data.

10. The system of claim 8, wherein the input signals sent from the server are at least partially responsive to the data signals received at the server.

11. A power generation process, comprising the steps of:

providing a server;

providing a plurality of power panels, each comprising

a control module comprising input connections, output connections, a signal processing circuit connected to the input connections and to the output connections, and a controller connected to the signal processing circuit,

a plurality of DC power cells connected to the input connections of the control module;

providing at least one inverter having input DC terminals, output AC terminals, and an inverter circuit connected to the input DC terminals and output AC terminals; and

providing communications links between the server and the controllers;

sending input signals from the server to the control modules over the communications links; and

controllably adjusting the DC output of one or more of the power panels in response to the input signals.

12. The process of claim 11, wherein the DC output of one or more of the power panels is controllably adjusted for any of

providing the same output DC voltage from each of the power panels;

increasing the total power output of the plurality of power panels;

or

increasing the total efficiency of the plurality of power panels.

13. The process of claim 11, wherein the at least one of the input signals sent from the server and received at the control modules comprises a control signal for a string comprising a plurality of the power panels, and wherein one or more of the power panels within the string are controllably adjusted in response to the control signal and to local values of any of voltage, current or temperature, to provide any of increased total power output of the string or decreasing mismatch between the power panels of the string.

14. The process of claim 11, wherein the DC output of one or more of the power panels is controllably adjusted to reduce power transmission losses from the array to the at least one inverter.

15. The process of claim 11, wherein an output signal produced at least one of the signal processing circuits has a voltage that is higher than a voltage of an input signal provided by the respective power panels.

16. The process of claim 11, wherein the power panels comprise any of solar panels, fuel cells, or batteries.

17. The process of claim 11, wherein the communication links between the server and each of the control modules comprise any of wired communication links and wireless communication links.

18. The process of claim 11, further comprising the step of:

sending data signals from the control modules to the server over the communication links.

19. The process of claim 18, wherein the data signals comprise any of input voltage data, input current data, output voltage data, output current data, temperature data, or insolation data.

20. The process of claim 18, wherein the input signals sent from the server are at least partially responsive to the data signals received at the server.

21. An apparatus, comprising:

a direct current (DC) input bus connectable to a DC voltage source;

an output direct current (DC) voltage bus connectable to a combiner, the combiner being connectable to an output direct current (DC) voltage bus from at least one other DC voltage source;

a signal processing circuit connected to the input DC bus and the output DC bus;

a controller connected to the signal processing circuit and having a communications interface;

means for sending and receiving signals over the communications interface, wherein one of the signals is sendable from the controller over the communications interface to a server and corresponds to the output voltage of the signal processing circuit; and

means for increasing the efficiency of an array comprised of the DC voltage source and the at least one other DC voltage source, by controllably varying the output DC voltage of the apparatus in response to a control signal received from the server over the communications interface.

22. The apparatus of claim 21, wherein the output DC voltage of the apparatus is controllably adjustable for any of

providing the same output DC voltage as the at least one other DC voltage source;

increasing the total power output of the array;

or

reducing power transmission losses from the array.

23. The apparatus of claim 21, wherein the DC voltage sources comprise any of solar panels, fuel cells, or batteries.

24. The apparatus of claim 21, wherein the means for sending and receiving signals over the communications interface comprises any of a wired communication link or a wireless communication link.

25. The apparatus of claim 21, wherein the controller further comprises means for sending data signals to the server over the communication link.

26. The apparatus of claim 25, wherein the data signals comprise any of input voltage data, input current data, output voltage data, output current data, temperature data, or insolation data.

27. An apparatus, comprising:

a direct current (DC) input bus connectable to a DC voltage source;

an output direct current (DC) voltage bus connectable to a combiner, the combiner being connectable to an output direct current (DC) voltage bus from at least one other DC voltage source;

a signal processing circuit connected to the input DC bus and the output DC bus;

a controller connected to the signal processing circuit and having a communications interface; and

means for sending and receiving signals over the communications interface, wherein at least one output signal is sendable from the controller over the communications interface to a server and corresponds to the output voltage of the signal processing circuit, and wherein at least one input signal is receivable at the controller, wherein the input signal comprises a control signal for a string comprising the DC voltage source and the at least one other DC voltage source, such that the DC voltage source is controllably adjustable in response to the control signal and to local values of any of voltage, current or temperature, to provide any of increased total power output of the string or decreasing mismatch between the power panels of the string.

28. The apparatus of claim 27, wherein the DC voltage sources comprise any of solar panels, fuel cells, or batteries.

29. The apparatus of claim 27, wherein the means for sending and receiving signals over the communications interface comprises any of a wired communication link or a wireless communication link.