PV SHUTDOWN SYSTEM WITH MID-CIRCUIT INTERRUPTER AND ENERGY STORAGE SYSTEM
A mid-circuit interrupter (MCI) with two terminals for a photovoltaic (PV) power generation system includes a switch power supply circuit, a slave controller, a switch component, a switch check circuit for detecting the working status of the MCI, and a communication component for communicating with an MCI controller.
1 . A mid-circuit interrupter (MCI) with two terminals for a photovoltaic (PV) power generation system, comprising:
a switch power supply circuit;
a slave controller;
a switch component;
a switch check circuit for detecting working status of the MCI; and
a communication component for communicating with an MCI controller.
2 . The MCI according to claim 1 , wherein the MCI is arranged to detect the working status of the MCI after receiving an instruction from the MCI controller and transmit a detection result to the MCI controller.
3 . The MCI according to claim 1 , further comprising:
a temperature sensor for detecting temperature of the switch component.
4 . The MCI according to claim 1 , further comprising:
an indicator for generating a sound and/or light signal when the MCI malfunctions.
5 . The MCI according to claim 1 , further comprising:
an energy storage circuit, wherein the energy storage circuit is arranged to supply power to the slave controller, the switch check circuit, and/or the communication component for a predetermined period of time after the MCI controller stops supplying power to the MCI.
6 . The MCI according to claim 5 , wherein the MCI is arranged to detect the working status of the MCI and send a detection result to the MCI controller using power supplied by the energy storage circuit.
7 . The MCI according to claim 1 , wherein a current supplied to the MCI is adjusted to maintain the current at a preset level.
8 . The MCI according to claim 1 , wherein the MCI is arranged to be connected with a PV module in series.
9 . A method for a mid-circuit interrupter (MCI) with two terminals for a photovoltaic (PV) power generation system, comprising:
providing supply power to turn on the MCI; or
terminating supply power to turn off the MCI, wherein the MCI includes:
a switch power supply circuit;
a slave controller;
a switch component;
a switch check circuit for detecting working status of the MCI; and
a communication component for communicating with an MCI controller.
10 . The method according to claim 9 , further comprising:
detecting the working status of the MCI after receiving an instruction from the MCI controller; and
transmitting a detection result to the MCI controller.
11 . The method according to claim 9 , further comprising:
detecting temperature of the switch component through a temperature sensor.
12 . The method according to claim 9 , further comprising:
generating a sound and/or light signal when the MCI malfunctions.
13 . The method according to claim 9 , further comprising:
supplying power to the slave controller, the switch check circuit, and/or the communication component for a predetermined period of time by an energy storage circuit after the MCI controller stops supplying power to the MCI.
14 . The method according to claim 13 , further comprising:
detecting the working status of the MCI and sending a detection result to the MCI controller using power supplied by the energy storage circuit.
15 . The method according to claim 9 , further comprising:
adjusting a current supplied to the MCI to maintain the current at a preset level.
16 . An energy storage system, comprising:
a DC/AC inverter;
a DC/DC converter;
a maximum power point tracking (MPPT) system;
a mid-circuit interrupter (MCI) controller; and
a battery module, wherein the MPPT system and the MCI controller are connected and arranged for connecting with a photovoltaic (PV) string and at least one MCI with two terminals, the PV string includes a plurality of PV modules connected in series, and the MCI controller is arranged to turn on the at least one MCI by providing supply power or turn off the at least one MCI by terminating supply power.
17 . The energy storage system according to claim 16 , wherein the MCI controller is arranged to send an instruction to the at least one MCI to cause the at least one MCI to detect working status and transmit a detection result.
18 . The energy storage system according to claim 16 , wherein the MCI controller comprises:
an MCI power supply circuit for supplying power to the at least one MCI;
a master controller; and
a first communication component for communicating with the at least one MCI.
19 . The energy storage system according to claim 18 , wherein the MCI controller further comprises:
an upward communication component for communicating with an upper controller.
20 . The energy storage system according to claim 16 , wherein the MCI controller is arranged to adjust a current supplied to the at least one MCI to maintain the current at a preset level.