Method of compensating the unbalanced current in the micro-grid power system, and a control device used in this method

摘要

PROBLEM TO BE SOLVED: To provide a system for appropriately compensating unbalanced currents and maintaining balance in each of phases.;SOLUTION: A microgrid power system 2 includes a three-phase three-wire distribution line 5, and a generating unit 10 and users'loads 50 connected to the distribution line 5. In the system, a measuring unit 20 and an imbalance-countermeasuring device 30 for compensating the imbalanced current are connected to the distribution line 5. A controller 40 is provided for controlling the compensating current supplied or consumed by the imbalance-countermeasuring device 30. Both a first current output and supplied from the generating unit 10 and a real-time second current coming from the measuring unit 20 and flowing through the distribution line 5 are obtained to control the compensating current, so as to change the second current to the first current. The imbalance-countermeasuring device 30 is constituted by an AC/DC converter and a variable resistor.;COPYRIGHT: (C)2010,JPO&INPIT