PHOTOVOLTAIC INTELLIGENT POWER SUPPLY

• US 20170271878A1
• Filed: 10/29/2015
• Published: 09/21/2017
• Est. Priority Date: 11/21/2014
• Status: Active Grant

• Current Assignee: CRRC Zhuzhou Institute Co., Ltd. (CRRC Corp. Ltd.)
• Original Assignee: CRRC Zhuzhou Institute Co., Ltd. (CRRC Corp. Ltd.)
• Inventors: FENG, Jianghua, JIAN, Fang, WU, Qiang, GUO, Jijing, WU, Hengliang, ZHANG, Honghao, CHEN, Yifeng, TANG, Haiyan, WANG, Nan, ZHAO, Xianggui, LIU, Zhaoyi, LI, Shaolong, ZHANG, Rong
• Granted Patent: US 10,122,176 B2
• Time in Patent Office: Days
• 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 3/381 Dispersed generators
• CPC Class Codes: H02M 3/158 including plural semiconductor devices as final control devices for a single load
• CPC Class Codes: H02S 40/30 Electrical components
• CPC Class Codes: H02S 40/32 comprising DC/AC inverter means associated with the PV module itself, e.g. AC modules
• CPC Class Codes: H02S 40/36 characterised by special electrical interconnection means between two or more PV modules, e.g. electrical module-to-module connection
• 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: Y02E 10/56 Power conversion systems, e.g. maximum power point trackers

Abstract

A photovoltaic intelligent power supply, comprising a plurality of unit modules, and a communication unit (103) and a control unit (106), wherein all the unit modules are connected to the control unit (106) and the communication unit (103); each unit module comprises an input collection unit (101), a data acquisition unit (102), a boost unit (104), an arc isolation unit (105) and an anti-PID unit (107), wherein the input collection unit (101) is connected to a photovoltaic module; the data acquisition unit (102) is configured to acquire voltage and current state signals; the boost unit (104) is configured to perform interleaving chopping and operate in an MPPT mode; the arc isolation unit (105) is configured to receive instructions sent by the control unit (106) to execute opening and closing; and the anti-PID unit (107) is configured to receive instructions sent by the control unit (106) so as to generate proper DC voltages to be applied between a negative electrode of a cell panel and the ground. The photovoltaic intelligent power supply supports MPPT control, and can effectively detect an arc and start protection, can ensure normal operation of an inverter, and improve reliability of a power generation system.

Claims

1. A photovoltaic intelligent power supply, comprising:

a plurality of unit modules, a communication unit (103) and a control unit (106), wherein all the unit modules are connected to the control unit (106) and the communication unit (103), each unit module comprises an input collection unit (101), a data acquisition unit (102), a boost unit (104), an arc isolation unit (105) and an anti-PID unit (107), wherein the input collection unit (101) is connected to a photovoltaic module, the data acquisition unit (102) is configured to acquire voltage and current state signals, the boost unit (104) is configured to perform interleaving chopping and operate in an MPPT mode, the arc isolation unit (105) is configured to receive instructions sent by the control unit (106) to execute opening and closing; and

the anti-PID unit (107) is configured to receive instructions sent by the control unit (106) so as to generate proper DC voltage to be applied between the negative electrode of a cell panel and ground.

2. The photovoltaic intelligent power supply according to claim 1, wherein the input collection unit (101) comprises more than two input branches connected to the photovoltaic module, and each input branch is connected in series to a fuse.

3. The photovoltaic intelligent power supply according to claim 1, wherein the arc isolation unit (105) comprises a DC circuit breaker.

4. The photovoltaic intelligent power supply according to claim 1, wherein the anti-PID unit (107) is constituted by a DC/DC unit or AC/DC unit, and powered by an anti-PID power source (210).

5. The photovoltaic intelligent power supply according to claim 1, wherein the boost unit (104) comprises an input capacitor (301), two IGBT modules (302) comprising backward diodes, two inductors (303), two major circuit diodes (304), an output capacitor (305) and two bypass diodes (306).

6. The photovoltaic intelligent power supply according to claim 5, wherein when the data acquisition unit (102) detects that input voltage is higher than output voltage, boost circuits in the boost unit (104) do not work, and current flows through the bypass diodes (306);

and when the input voltage is lower than the output voltage, the boost circuits in the boost unit (104) work, while the bypass diodes (306) are naturally switched off, the two boost circuits are enabled to interleaving chopping output according to requirements of MPPT.

7. The photovoltaic intelligent power supply according to claim 6, wherein a first drive circuit (207) is disposed between the control unit (106) and the boost unit (104) to directly receive instructions from the control unit (106) and then drive boost circuits.

8. The photovoltaic intelligent power supply according to claim 6, wherein a second drive circuit (208) is disposed between the control unit (106) and the anti-PID unit (107) to receive instructions from the control unit (106) and then drive the anti-PID unit (107).

9. The photovoltaic intelligent power supply according to claim 2, wherein the boost unit (104) comprises an input capacitor (301), two IGBT modules (302) comprising backward diodes, two inductors (303), two major circuit diodes (304), an output capacitor (305) and two bypass diodes (306).

10. The photovoltaic intelligent power supply according to claim 9, wherein when the data acquisition unit detects (102) that input voltage is higher than output voltage, boost circuits in the boost unit (104) do not work, and current flows through the bypass diodes (306);

and when the input voltage is lower than the output voltage, the boost circuits in the boost unit (104) work, while the bypass diodes (306) are naturally switched off, the two boost circuits are enabled to interleaving chopping output according to requirements of MPPT.

11. The photovoltaic intelligent power supply according to claim 10, wherein a first drive circuit (207) is disposed between the control unit (106) and the boost unit (104) to directly receive instructions from the control unit (106) and then drive boost circuits.

12. The photovoltaic intelligent power supply according to claim 10, wherein a second drive circuit (208) is disposed between the control unit (106) and the anti-PID unit (107) to receive instructions from the control unit (106) and then drive the anti-PID unit (107).

13. The photovoltaic intelligent power supply according to claim 3, wherein the boost unit (104) comprises an input capacitor (301), two IGBT modules (302) comprising backward diodes, two inductors (303), two major circuit diodes (304), an output capacitor (305) and two bypass diodes (306).

14. The photovoltaic intelligent power supply according to claim 13, wherein when the data acquisition unit (102) detects that input voltage is higher than output voltage, boost circuits in the boost unit (104) do not work, and current flows through the bypass diodes (306);

and when the input voltage is lower than the output voltage, the boost circuits in the boost unit (104) work, while the bypass diodes (306) are naturally switched off, the two boost circuits are enabled to interleaving chopping output according to requirements of MPPT.

15. The photovoltaic intelligent power supply according to claim 14, wherein a first drive circuit (207) is disposed between the control unit (106) and the boost unit (104) to directly receive instructions from the control unit (106) and then drive boost circuits.

16. The photovoltaic intelligent power supply according to claim 14, wherein a second drive circuit (208) is disposed between the control unit (106) and the anti-PID unit (107) to receive instructions from the control unit (106) and then drive the anti-PID unit (107).

17. The photovoltaic intelligent power supply according to claim 4, wherein the boost unit (104) comprises an input capacitor (301), two IGBT modules (302) comprising backward diodes, two inductors (303), two major circuit diodes (304), an output capacitor (305) and two bypass diodes (306).

18. The photovoltaic intelligent power supply according to claim 17, wherein when the data acquisition unit (102) detects that input voltage is higher than output voltage, boost circuits in the boost unit (104) do not work, and current flows through the bypass diodes (306);

and when the input voltage is lower than the output voltage, the boost circuits in the boost unit (104) work, while the bypass diodes (306) are naturally switched off, the two boost circuits are enabled to interleaving chopping output according to requirements of MPPT.

19. The photovoltaic intelligent power supply according to claim 18, wherein a first drive circuit (207) is disposed between the control unit (106) and the boost unit (104) to directly receive instructions from the control unit (106) and then drive boost circuits.

20. The photovoltaic intelligent power supply according to claim 18, wherein a second drive circuit (208) is disposed between the control unit (106) and the anti-PID unit (107) to receive instructions from the control unit (106) and then drive the anti-PID unit (107).