Power supply system, control method of power supply system, and power supply apparatus
In order to build a system capable of managing efficient operation control between a plurality of distributed power sources without compromising versatility of a distributed power source side, a power supply system of the disclosure herein is a power supply system having a plurality of distributed power sources including a battery and a power generation apparatus configured to generate power while forward power flow is detected, the power supply system including an interconnection operation switch to be closed during an interconnection operation such that an output from a grid is supplied to a load, a first current sensor disposed between the interconnection operation switch and the load, and configured to detect the forward power flow, a first supply path changeover switch capable of closing such that an output from the power generation apparatus is supplied to the load without passing through the first current sensor, and a second supply path changeover switch capable of closing such that the output from the power generation apparatus is supplied to the load via the first current sensor.
1. A power supply system having a plurality of distributed power sources including a storage battery and a power generation apparatus configured to generate power while forward power flow is detected, the power supply system comprising:
an interconnection operation switch to be closed during an interconnection operation such that an output from a grid is supplied to a load;
a first current sensor disposed between the interconnection operation switch and the load, and configured to detect the forward power flow;
a first supply path changeover switch capable of closing such that an output from the power generation apparatus is supplied to the load without passing through the first current sensor; and
a second supply path changeover switch capable of closing such that the output from the power generation apparatus is supplied to the load via the first current sensor,
wherein, during an interconnection operation, the interconnection operation switch and the first supply path changeover switch are closed, and the second supply path changeover switch is opened, and
during an independent operation, the interconnection operation switch is opened, and based on whether the battery is being charged or discharging, one of the first supply path changeover switch and the second supply path changeover switch is closed.
2. The power supply system according to claim 1 , wherein, during an interconnection operation, the interconnection operation switch and the first supply path changeover switch are closed, and the second supply path changeover switch is opened, and during an independent operation, the interconnection operation switch and the first supply path changeover switch are opened, and the second supply path changeover switch is closed.
3. The power supply system according to claim 1 , further comprising a second current sensor between the grid and the interconnection operation switch, wherein
during an interconnection operation, when the second current sensor detects power supply from the grid to the interconnection operation switch, the interconnection operation switch and the second supply path changeover switch are closed, and the first supply path changeover switch is opened and, during the interconnection operation, when the second current sensor does not detect the power supply from the grid to the interconnection operation switch, the interconnection operation switch and the first supply path changeover switch are closed, and the second supply path changeover switch is opened, and
during an independent operation, the interconnection operation switch and the first supply path changeover switch are opened, and the second supply path changeover switch is closed.
4. The power supply system according to claim 1 , wherein the power generation apparatus has a mode of checking a function of the first current sensor to detect the forward power flow, and when the checking is performed, the first supply path changeover switch is closed, and the second supply path changeover switch is opened.
5. The power supply system according to claim 4 , wherein a third current sensor configured to detect timing of the checking is further disposed between the first supply path changeover switch and the second supply path changeover switch.
6. The power supply system according to claim 4 , wherein the power generation apparatus outputs a signal to inform of timing to check a function of the first current sensor to detect the forward power flow.
7. The power supply system according to claim 1 , comprising a circuit element configured to close the first supply path changeover switch in conjunction with the closing of the interconnection operation switch and to open the second supply path changeover switch in conjunction with the closing of the interconnection operation switch.
8. The power supply system according to claim 1 , wherein, during the independent operation, one of, some of, or all of the plurality of distributed power sources supply power such that the first current sensor detects a dummy current of the forward power flow.
9. A control method of a power supply system having a plurality of distributed power sources including a storage battery and a power generation apparatus configured to generate power while forward power flow is detected, the control method of the power supply system comprising the steps of:
closing an interconnection operation switch during an interconnection operation such that an output from a grid is supplied to a load;
closing a first supply path changeover switch such that an output from the power generation apparatus is supplied to the load without passing through a first current sensor, the first current sensor being disposed between the interconnection operation switch and the load, and configured to detect the forward power flow;
closing a second supply path changeover switch such that the output from the power generation apparatus is supplied to the load via the first current sensor;
during an interconnection operation, closing the interconnection operation switch and the first supply path changeover switch, and opening the second supply path changeover switch; and
during an independent operation, opening the interconnection operation switch, and based on whether the battery is being charged or discharging, closing one of the first supply path changeover switch and the second supply path changeover switch.
10. A power supply apparatus configured to control a plurality of distributed power sources including a storage battery and a power generation apparatus configured to generate power while forward power flow is detected, the power supply apparatus comprising:
a controller configured to control;
an interconnection operation switch to be closed during an interconnection operation such that an output from a grid is supplied to a load;
a first supply path changeover switch capable of closing such that an output from the power generation apparatus is supplied to the load without passing through a first current sensor, the first current sensor being disposed between the interconnection operation switch and the load, and configured to detect the forward power flow; and
a second supply path changeover switch capable of closing such that the output from the power generation apparatus is supplied to the load via the first current sensor,
wherein, during an interconnection operation, the interconnection operation switch and the first supply path changeover switch are closed, and the second supply path changeover switch is opened, and
during an independent operation, the interconnection operation switch is opened, and based on whether the battery is being charged or discharging, one of the first supply path changeover switch and the second supply path changeover switch is closed.
11. The power supply system according to claim 2 , wherein the power generation apparatus has a mode of checking a function of the first current sensor to detect the forward power flow, and when the checking is performed, the first supply path changeover switch is closed, and the second supply path changeover switch is opened.
12. The power supply system according to claim 3 , wherein the power generation apparatus has a mode of checking a function of the first current sensor to detect the forward power flow, and when the checking is performed, the first supply path changeover switch is closed, and the second supply path changeover switch is opened.
13. The power supply system according to claim 2 , comprising a circuit element configured to close the first supply path changeover switch in conjunction with the closing of the interconnection operation switch and to open the second supply path changeover switch in conjunction with the closing of the interconnection operation switch.
14. The power supply system according to claim 2 , wherein, during the independent operation, one of, some of, or all of the plurality of distributed power sources supply power such that the first current sensor detects a dummy current of the forward power flow.
15. The power supply system according to claim 3 , wherein, during the independent operation, one of, some of, or all of the plurality of distributed power sources supply power such that the first current sensor detects a dummy current of the forward power flow.
16. The power supply system according to claim 4 , wherein, during the independent operation, one of, some of, or all of the plurality of distributed power sources supply power such that the first current sensor detects a dummy current of the forward power flow.
17. The power supply system according to claim 5 , wherein, during the independent operation, one of, some of, or all of the plurality of distributed power sources supply power such that the first current sensor detects a dummy current of the forward power flow.