Micro-grid system with un-interruptible power supply

A microgrid system with a power supply, comprising:

• a first node having AC power from a bus system applied thereto;
• a first generator for applying DC power to a second node;
• a first load connected to a third node and receiving the AC power therefrom;
• a second load connected to the second node and receiving DC power therefrom;
• a third load connected to a fourth node and receiving AC power therefrom;
• a first converter converting the DC power of the second node into AC power, and outputting the same;
• a second converter converting the DC power of the second node into AC power, and outputting the same;
• a switch unit adjusting a connection relationship between the first node, the third node, the fourth node, the first converter, and the second converter, according to statuses of the first converter and the second converter;
• and
• a second generator for applying AC power to a fifth node,
• wherein when AC power is not applied to the first node from the bus system, the switch unit connects the fifth node to the third node, and
• wherein when the second converter does not operate, the switch unit connects the fifth node to the fourth node.

A microgrid system with a power supply, comprising:

• a first node having AC power from a bus system applied thereto;
• a second node having DC power from a first generator applied thereto, and connected to a first load;
• a third node having AC power applied thereto, and connected to a second load;
• a fourth node having AC power applied thereto, and connected to a third load;
• a first converter converting the DC power of the second node into AC power and outputting the same;
• a second converter converting the DC power of the second node into AC power and outputting the same;
• a fifth node having AC power from a second generator applied thereto;
• a first switch selectively connecting the first node or the fifth node to a sixth node;
• a second switch connected between the first node and a seventh node;
• a third switch connected between the sixth node and the seventh node;
• a fourth switch connected between the sixth node and the third node;
• a fifth switch connected between the third node and the first converter;
• a sixth switch connected between the second converter and the fourth node;
• and
• a seventh switch connected between the seventh node and the fourth node.