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In islanding microgrid, the impact of line impedance on the proportional power sharing cannot be neglected if multi-inverters are operated to form a microgrid. In this paper, an improved droop controller is proposed to reduce the unexpected dynamic and steady power sharing errors caused by the mismatching of line impedance. With this proposed combined compensation, the power quality, the dynamic and...
The Standards and Calibration Laboratory (SCL) of Hong Kong has developed a primary standard of power based on sampling principle. The primary standard is used to provide calibration service for precision power meters. The measurement uncertainty is 55 × 10−6 for voltage from 24 to 480 V and current from 0.005 to 160 A and power factor from unity to 0 leading or lagging.
Current distance relay is accommodated with Power Swing Blocking (PSB) scheme. However, this blocking scheme prove to vulnerable to distance relay operation as it could block the trip signals if the symmetrical fault occur during power swing. Hence, it is important to develop the proper fault detection scheme during power swing to avoid such undesirable circumstances. This paper presents a new detection...
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