ISLANDING PEVENTION FOR APPARATUS DISTRIBUTED POWER UNIT

摘要

PROBLEM TO BE SOLVED: To provide an islanding prevention which apparatus modifies a protective function for interconnection with a commercial system, in a low-voltage distribution system which has a DC power source such as a solar cell, a fuel cell, etc.;SOLUTION: The distributed power unit 10 has the DC power source 11, an inverter 12 which converts the DC power generated from the DC power source 11, and an interconnection breaker 13 for interconnecting with a single-phase three-line type low-voltage distribution system 3. Besides, it is connected with the single-phase three-line low-voltage distribution system. It is provided with a voltage unbalance detector 16 which detects the unbalance between the two interphase voltages of the single-phase three-line low-voltage distribution system 3 connected to the distributed power unit 10. A controller 14 stops the above inverter 12 or disconnects the decentralized power unit from the single-phase three-line type low-voltage distribution system by means of the above system breaker 13 when the voltage unbalance detector 16 detects the unbalance between the two interphase voltages of the single-phase three-line type low-voltage distribution system 3.;COPYRIGHT: (C)2008,JPO&INPIT