Power conversion system

Abstract

To reduce a deviation between an amount of power calculated by a power conversion system and an amount of power actually stored in a stationary storage battery with respect to the amount of power stored in the stationary storage battery.SOLUTION: A power conversion system 1 includes a first DC / DC converter 11a, a second DC / DC converter 11b, an inverter 12, an AC power meter 14, a first DC power meter 151, a second DC power meter 152, and a control unit 13. The control unit 13 calculates an amount of power derived from each of the AC power meter 14, the first DC power meter 151, and the second DC power meter 152 based on power measured by each meter. The amount of power derived from each meter is an amount of power stored in a stationary storage battery 7 and derived from each of a plurality of power supply sources. The control unit 13 corrects the amount of power from each meter by using power amount information on the amount of power of the stationary storage battery 7.SELECTED DRAWING: Figure 25

Claims

1. A first DC / DC converter connected to a power generation device that converts renewable energy into electrical energy, a second DC / DC converter connected to a stationary battery, an inverter having a DC terminal side connected to a junction point of the first DC / DC converter and the second DC / DC converter and an AC terminal side connected to a distribution board connected to a power grid and a load, an AC power meter installed between the inverter and the distribution board, a first DC power meter installed between the first DC / DC converter and the power generation device, a second DC power meter installed between the second DC / DC converter and the stationary battery, and a control unit that calculates, based on the power measured by the AC power meter, the first DC power meter, and the second DC power meter, the amount of power from each source that is stored in the stationary battery and derived from a plurality of power supply sources. The control unit corrects the amount of power from each source using power amount information regarding the amount of power in the stationary battery. A power conversion system.

2. The amount of power from each source includes the amount of power from the power generation device that is stored in the stationary battery and derived from the power generation device, and the amount of power from the power grid that is stored in the stationary battery and derived from the power grid. The power conversion system according to Claim 1.

3. The control unit corrects the amount of power from each source using the charge / discharge efficiency of the stationary battery. The power conversion system according to Claim 1 or 2.

4. The control unit corrects the amount of power from each source at the timing set in the power conversion system. The power conversion system according to Claim 3.

5. When charging and discharging of the stationary battery are performed, the control unit always corrects the amount of power from each source. The power conversion system according to Claim 4.

6. When charging and discharging of a certain amount or more are performed on the stationary battery, the control unit corrects the amount of power from each source. The power conversion system according to Claim 4.

7. The control unit calculates the amount of power from each source by multiplying each source current, which is a current derived from each of the plurality of power supply sources, by time, stores the amount of power from each source, performs information management based on the amount of power from each source, and calculates the amount of power from each source from the amount of power from each source and each source voltage. The power conversion system according to Claim 1 or 2.

8. The control unit corrects the amount of power from each source in consideration of the power consumption inside the stationary battery. The power conversion system according to claim 1 or 2.

9. The control unit calculates the amount of battery consumption power consumed inside the stationary battery at a fixed cycle, and corrects the amount of power from each source using the calculated amount of battery consumption power. The power conversion system according to claim 8.

10. The control unit acquires the amount of battery consumption power consumed inside the stationary battery from the stationary battery at the timing when a fixed period has elapsed, and corrects the amount of power from each source using the acquired amount of battery consumption power. The power conversion system according to claim 8.

11. The control unit corrects the amount of power from each source at the timing set on the stationary battery side. The power conversion system according to claim 1 or 2.

12. The control unit corrects the amount of power from each source when performing full charge correction to correct the charge state of the stationary battery to full charge. The power conversion system according to claim 11.

13. The control unit corrects the amount of power from each source when performing SOC correction to correct the SOC of the stationary battery. The power conversion system according to claim 11.

14. The control unit corrects the amount of power from each source when performing SOH correction to correct the SOH of the stationary battery. The power conversion system according to claim 11.

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