DC power distribution system and control power generation device
Voltage command values are set according to voltage fluctuations of a plurality of power supply sources, and one of outputs from a plurality of power supply circuits which output DC voltages obtained by performing conversion according to the voltage command values is supplied to a power conversion circuit as control power so that the system can be continuously operated even at the time of an abnormality due to a device failure and a power outage, and control power consumption can be suppressed in the case of voltage fluctuations of the power supply sources.
1 . A DC power distribution system in which a power distribution network for supplying power from a plurality of power supply sources to a plurality of electric loads is formed, the DC power distribution system comprising:
a power conversion circuit which is connected between the plurality of power supply sources and the plurality of electric loads and which supplies power corresponding to each of the electric loads; and
a control power generator which supplies control power for controlling the power conversion circuit, wherein
the control power generator includes
a control device which receives detected voltages of the respective power supply sources and which, when the detected voltages having been received are larger than a predetermined value, sets voltage command values based on the respective detected voltages,
a plurality of power supply circuits which are connected to the respective power supply sources and which output DC voltages obtained by performing conversion according to the voltage command values, and
a control power circuit which supplies, to the power conversion circuit, control power based on one of the outputs from the plurality of power supply circuits, and
the control device sets, to a largest value, the voltage command value corresponding to a lowest voltage among the detected voltages larger than the predetermined value.
2 . The DC power distribution system according to claim 1 , wherein
each of the plurality of power supply circuits has
a DC/DC converter circuit which is formed to be capable of electrical isolation between a voltage from the corresponding power supply source and an output voltage, and
an output voltage setter which is located in an output stage and which is composed of a shunt regulator, a plurality of resistors, and an opening/closing switch, and
the opening/closing switch performs switching between a conducting state and an opened state according to an output signal from the control device.
3 . The DC power distribution system according to claim 2 , wherein the plurality of power supply sources and the plurality of electric loads are connected to each other by a DC bus electrical path.
4 . The DC power distribution system according to claim 3 , wherein the plurality of power supply sources include at least two out of a grid power supply, a storage battery, and a solar cell.
5 . The DC power distribution system according to claim 2 , wherein the plurality of power supply sources include at least two out of a grid power supply, a storage battery, and a solar cell.
6 . The DC power distribution system according to claim 1 , wherein the plurality of power supply sources and the plurality of electric loads are connected to each other by a DC bus electrical path.
7 . The DC power distribution system according to claim 6 , wherein the plurality of power supply sources include at least two out of a grid power supply, a storage battery, and a solar cell.
8 . The DC power distribution system according to claim 1 , wherein the plurality of power supply sources include at least two out of a grid power supply, a storage battery, and a solar cell.
9 . A DC power distribution system in which a power distribution network for supplying power from a plurality of power supply sources to a plurality of electric loads is formed, the DC power distribution system comprising:
a power conversion circuit which is connected between the plurality of power supply sources and the plurality of electric loads and which supplies power corresponding to each of the electric loads; and
a control power generator which supplies control power for controlling the power conversion circuit, wherein
the control power generator includes
a plurality of power supply circuits which are connected to the respective power supply sources and which output DC voltages, and
a control device which receives detected voltages of the respective power supply sources and which supplies a DC voltage output to the power conversion circuit as the control power, the DC voltage output being of the power supply circuit corresponding to a lowest voltage among detected voltages larger than a predetermined value out of the detected voltages having been received.
10 . The DC power distribution system according to claim 9 , wherein the plurality of power supply sources and the plurality of electric loads are connected to each other by a DC bus electrical path.
11 . The DC power distribution system according to claim 10 , wherein the plurality of power supply sources include at least two out of a grid power supply, a storage battery, and a solar cell.
12 . The DC power distribution system according to claim 9 , wherein the plurality of power supply sources include at least two out of a grid power supply, a storage battery, and a solar cell.
13 . A control power generation device which supplies control power for controlling a power conversion circuit in which a power distribution network for supplying power from a plurality of power supply sources to a plurality of electric loads is formed, the power conversion circuit being connected between the plurality of power supply sources and the plurality of electric loads and being configured to supply power corresponding to each of the electric loads, the control power generation device comprising:
a control device which receives detected voltages of the respective power supply sources and which, when the detected voltages having been received are larger than a predetermined value, sets voltage command values based on the respective detected voltages;
a plurality of power supply circuits which are connected to the respective power supply sources and which output DC voltages obtained by performing conversion according to the voltage command values; and
a control power circuit which supplies, to the power conversion circuit, control power based on one of the outputs from the plurality of power supply circuits, wherein
the control device sets, to a largest value, the voltage command value corresponding to a lowest voltage among the detected voltages larger than the predetermined value.