Photovoltaic direct-current breaking apparatus

Patent metadata

Field	Value
Publication number	US-11539326-B2
Application number	US-202117359011-A
Country	US
Kind code	B2
Filing date	Jun 25, 2021
Priority date	Dec 28, 2018
Publication date	Dec 27, 2022
Grant date	Dec 27, 2022

Abstract

This application discloses a photovoltaic direct-current breaking apparatus, including a positive connection terminal and a negative connection terminal for connecting a photovoltaic string and a photovoltaic energy converter, a first diode, a first switch, a convector circuit, and an energy absorption circuit, where the first switch, the convector circuit, and the energy absorption circuit are connected in parallel. The convector circuit can effectively avoid arc discharge and ablation generated when the first switch cuts off a direct-current circuit between the photovoltaic string and the photovoltaic energy converter. The first diode can effectively bypass energy stored by an energy storage device in the photovoltaic energy converter, helping reduce required specifications of a semiconductor device in the convector circuit. The energy absorption circuit can also effectively reduce required specifications of the semiconductor device and a varistor.

First claim

What is claimed is:

1. A photovoltaic direct-current breaking apparatus, comprising:
a first positive connection terminal, a first negative connection terminal, a second positive connection terminal, a second negative connection terminal, a first switch, a first diode, a convector circuit, and an energy absorption circuit; wherein
the first positive connection terminal and the first negative connection terminal are configured to connect an output terminal of a first photovoltaic string, and the second positive connection terminal and the second negative connection terminal are configured to connect a photovoltaic energy converter;
the first switch, the convector circuit, and the energy absorption circuit are connected in parallel, and are connected between the first negative connection terminal and the second negative connection terminal, a cathode of the first diode is connected between the first positive connection terminal and the second positive connection terminal, and an anode of the first diode is connected between the second negative connection terminal and a parallel circuit of the first switch, the convector circuit, and the energy absorption circuit; or the first switch, the convector circuit, and the energy absorption circuit are connected in parallel between the first positive connection terminal and the second positive connection terminal, a cathode of the first diode is connected between the second positive connection terminal and a parallel circuit of the first switch, the convector circuit, and the energy absorption circuit, and an anode of the first diode is connected between the first negative connection terminal and the second negative connection terminal; and
the convector circuit comprises a first fully-controlled semiconductor device, a second fully-controlled semiconductor device, a second diode, and a third diode, wherein a cathode of the second diode is connected to an input terminal of the first fully-controlled semiconductor device, an anode of the second diode is connected to an output terminal of the first fully-controlled semiconductor device and an output terminal of the second fully-controlled semiconductor device, an anode of the third diode is connected to the output terminal of the second fully-controlled semiconductor device, and a cathode of the third diode is connected to an input terminal of the second fully-controlled semiconductor device,
wherein the energy absorption circuit comprises a gas discharge tube, a varistor, and a steady-state balance resistor, and
wherein the gas discharge tube is connected in parallel to the steady-state balance resistor, and connected in series to the varistor.

2. The photovoltaic direct-current breaking apparatus of claim 1 , wherein the photovoltaic direct-current breaking apparatus further comprises a second switch;
when the first switch, the convector circuit, and the energy absorption circuit are connected in parallel, and are connected between the first negative connection terminal and the second negative connection terminal, one end of the second switch is connected to the first negative connection terminal, and the other end of the second switch is connected to one end of the first switch, the cathode of the second diode, and one end of the gas discharge tube, or one end of the second switch is connected to the second negative connection terminal and the anode of the first diode, and the other end of the second switch is connected to one end of the first switch, the cathode of the third diode, and one end of the varistor.

3. The photovoltaic direct-current breaking apparatus of claim 1 , wherein the photovoltaic direct-current breaking apparatus further comprises a third switch; and
the third switch is connected between the first positive connection terminal and a connection point of the second positive connection terminal and the cathode of the first diode.

4. The photovoltaic direct-current breaking apparatus of claim 1 , wherein the photovoltaic direct-current breaking apparatus further comprises a fourth switch;
when the first switch, the convector circuit, and the energy absorption circuit are connected in parallel, and are connected between the first positive connection terminal and the second positive connection terminal, one end of the fourth switch is connected to the first positive connection terminal, and the other end of the fourth switch is connected to one end of the first switch, the cathode of the second diode, and one end of the gas discharge tube, or one end of the fourth switch is connected to the second positive connection terminal and the cathode of the first diode, and the other end of the fourth switch is connected to one end of the first switch, the cathode of the third diode, and one end of the varistor.

5. The photovoltaic direct-current breaking apparatus of claim 1 , wherein the photovoltaic direct-current breaking apparatus further comprises a fifth switch; and
the fifth switch is connected between the first negative connection terminal and a connection point of the second negative connection terminal and the anode of the first diode.

6. The photovoltaic direct-current breaking apparatus of claim 1 , wherein the photovoltaic direct-current breaking apparatus further comprises a third positive connection terminal and a third negative connection terminal; and
the third negative connection terminal is connected between the first negative connection terminal and the parallel circuit of the first switch, the convector circuit, and the energy absorption circuit, the third positive connection terminal is connected between the first positive connection terminal and a connection point of the second positive connection terminal and the cathode of the first diode, and the third positive connection terminal and the third negative connection terminal are configured to connect an input terminal of a second photovoltaic string.

7. The photovoltaic direct-current breaking apparatus of claim 6 , wherein the photovoltaic direct-current breaking apparatus further comprises a sixth switch and a seventh switch;
one end of the sixth switch is connected to the first negative connection terminal, and the other end of the sixth switch is connected to one end of the first switch, the cathode of the second diode, and one end of the gas discharge tube; and
one end of the seventh switch is connected to the third negative connection terminal, and the other end of the seventh switch is connected to one end of the first switch, the cathode of the second diode, and one end of the gas discharge tube.

8. The photovoltaic direct-current breaking apparatus of claim 6 , wherein the photovoltaic direct-current breaking apparatus further comprises an eighth switch and a ninth switch;
the eighth switch is connected between the first positive connection terminal and the connection point of the second positive connection terminal and the cathode of the first diode; and
one end of the ninth switch is connected to the third positive connection terminal, and the other end of the ninth switch is connected to the third positive connection terminal and the connection point of the second positive connection terminal and the cathode of the first diode.

9. The photovoltaic direct-current breaking apparatus of claim 6 , wherein the photovoltaic direct-current breaking apparatus further comprises a tenth switch and an eleventh switch;
one end of the tenth switch is connected to the first positive connection terminal, and the other end of the tenth switch is connected to one end of the first switch, the cathode of the second diode, and one end of the gas discharge tube; and
one end of the eleventh switch is connected to the third positive connection terminal, and the other en

Assignees

• Huawei Tech Co Ltd
• Huawei Digital Power Tech Co Ltd

Inventors

• Wang Xun
• Zhang Yanzhong

Classifications

• H01C10/50

  structurally combined with switching arrangements (H01C10/36 takes precedence) · CPC title

• H01H33/596 Primary

  for interrupting DC · CPC title

• Y02E10/50

  Photovoltaic [PV] energy · CPC title

• H02H5/00

  Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection (using simulators of the apparatus being protected H02H6/00; specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems H02H7/00) · CPC title

• H02S40/36 Primary

  characterised by special electrical interconnection means between two or more PV modules, e.g. electrical module-to-module connection · CPC title