Power source system

A power source system for supplying DC (direct current) power to a load, comprising:

• a plurality of first power source apparatuses that are connected to an alternating current (AC) power source, each first power source apparatus being configured to convert AC power received from the AC power source to first DC power;
• and
• a plurality of second power source apparatuses that are each connected to a battery, and are each configured to convert power of the corresponding battery to second DC power, wherein
• each of the plurality of first power source apparatuses includes
• a first voltage detector connected to an output of said each first power source apparatus, and
• a first voltage regulator configured to obtain a first differential between a first voltage detected by the first voltage detector and a first voltage command value, to thereby control said each first power source apparatus to decrease the first differential to zero,
• each of the plurality of second power source apparatuses includes
• a second voltage detector connected to an output of said each second power source apparatus, and
• a second voltage regulator configured to obtain a second differential between a second voltage detected by the second voltage detector and a second voltage command value, to thereby control said each second power source to decrease the second differential to zero, so as to supply to the load
• in a normal mode, a sum of the first DC power converted by the first power source apparatuses,
• in a back-up mode, a sum of the second DC power converted by the second power source apparatuses, and
• in an assist mode, a combination of the first and second DC power converted by the first and second power source apparatuses.

A power source system for supplying DC (direct current) power to a load, comprising:

• a first power source apparatus connected to an alternating current (AC) power source, and configured to convert AC power received from the AC power source to first DC power;
• a second power source apparatus connected to a battery, and configured to convert power of the battery to second DC power;
• a first control apparatus connected to the first power source apparatus, the first control apparatus including
• a first voltage detector connected to an output of the first power source apparatus, and
• a first voltage regulator configured to obtain a first differential between a first voltage detected by the first voltage detector and a first voltage command value, to thereby control the first power source apparatus to decrease the first differential to zero,
• a second control apparatus connected to the second power source apparatus, the second control apparatus including
• a second voltage detector connected to an output of the second power source apparatus, and
• a second voltage regulator configured to obtain a second differential between a second voltage detected by the second voltage detector and a second voltage command value, to thereby control the second power source to decrease the second differential to zero,
• the second voltage command value being adjustable in accordance with an output of the first voltage regulator and an outage status of the AC power source, so as to supply to the load
• the first DC power in a normal mode,
• the second DC power in a back-up mode, and
• a combination of the first and second DC power in an assist mode.