To meet the demands of the high reliability and high quality power supply of many important loads

we proposed and designed a new power supply solution called high reliable power supply island. The power supply island is comprised of source power controller

load power controller

bus power controller

emergency power supply

AC bus

and DC bus. And it can realize many functions

for example

multiple power sources can seamlessly switch

source power flow can be effectively controlled

load power supply can be artificially improved

emergency power supply can be seamlessly connected

and bus power parameters remain stable throughout. Moreover

we systematically expounded the basic structure and working principle of the high reliable power supply island firstly. Then

we presented five application examples having different reliability levels

such as double power sources with double loads

three-phase four-wire connection mode

high-speed electronic switch as an alternate

energy storage system connected to DC bus

double AC bus being mutual standby. Finally

we analyzed four typical application scenarios about industrial equipment power supply

information equipment power supply

safety emergency power supply and important occasion security power. Research shows that the high reliable power supply island is a comprehensive solution to increase power supply reliability and improve power quality.