Power control apparatus, power control method, program, and energy management system

A power control method for a power control apparatus, the power control apparatus comprising:

• a direct current bus supplying direct current power;
• a first conversion apparatus that applies DC/DC conversion to direct current power from a power generator, and outputs the resultant direct current power to the direct current bus;
• a second conversion apparatus that applies DC/DC4 conversion to direct current power from the direct current bus and charges a power storage unit with the resultant direct current power, applies DC/DC conversion to direct current power from the power storage unit, and discharges the resultant direct current power to the direct current bus;
• a third conversion apparatus that applies DC/AC conversion to the direct current power from the direct current bus and supplies alternating current power to a power system and an alternating current load;
• and
• a controller configured with a program to control driving of the first to third conversion apparatuses;
• the power control method comprising:
• setting, via the controller, when output from the power generator is lower than a predetermined threshold, a potential of the direct current bus to a first potential that enables the first conversion apparatus to perform stable operation;
• causing, via the controller, the second conversion apparatus to perform the charge;
• and
• suspending, via the controller, the third conversion apparatus.

A non-transitory computer readable medium comprising instructions that, when executed, cause a processor to control a power control apparatus comprising:

• a direct current bus serving as a path for supplying direct current power;
• a first conversion apparatus that applies DC/DC conversion to direct current power from a power generator, and outputs the resultant direct current power to the direct current bus;
• a second conversion apparatus that applies DC/DC conversion to the direct current power from the direct current bus, charges a power storage unit with the resultant direct current power, applies DC/DC conversion to direct current power from the power storage unit, and discharges the resultant direct current power to the direct current bus;
• and
• a third conversion apparatus that applies DC/AC conversion to the direct current power from the direct current bus and supplies alternating current power to a power system and an alternating current load;
• the instructions causing the processor to perform operations comprising:
• setting, when a measured output from the power generator is lower than a predetermined threshold, a potential of the direct current bus to a potential that enables the first conversion apparatus to perform stable operation;
• causing the second conversion apparatus to perform the charge;
• and suspending the third conversion apparatus.

An energy management system, comprising:

• a power generator;
• a power storage unit for storing power;
• a direct current bus supplying direct current power;
• a first conversion apparatus that applies DC/DC conversion to direct current power from the power generator, and outputs the resultant direct current power to the direct current bus;
• a second conversion apparatus that applies DC/DC conversion to the direct current power from the direct current bus and charges the power storage unit with the resultant direct current power, applies DC/DC conversion to direct current power from the power storage unit, and discharges the resultant direct current power to the direct current bus;
• a third conversion apparatus that applies DC/AC conversion to the direct current power from the direct current bus and supplies alternating current power to a power system and an alternating current load;
• a fourth conversion apparatus that applies DC/DC conversion to the direct current power from the direct current bus and supplies the resultant direct current power to a DC load;
• and
• a controller configured with a program to control driving of the first to fourth conversion apparatuses, wherein
• when output from the power generator is lower than a predetermined threshold, the controller is configured with the program to perform operations comprising:
• setting a potential of the direct current bus to a first potential that enables the first conversion apparatus to perform stable operation,
• causing the second conversion apparatus to perform the charge, and suspending the third conversion apparatus.