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In recent years, with development of smart grid and proposing of energy internet, fiber optic current transformer (FOCT) also develops rapidly, and becomes the main direction of current transformer. The transient performance of FOCT is to measure the transient process of power system accurately. However, researchers often ignore the transient performance, or can't simulate the actual transient situation...
Based on the problem of accuracy ratio drift with temperature in FOCT engineering application, the conclusion that the main FOCT temperature error is coming from some optic devices as the sensor unit, SLD source, phase modulator, delay fiber is described. Feasible methods to restrain temperature error are discussed from a technical point of view, FOCT engineering prototype is developed and the temperature...
The long-term operation stability of fiber optical current transformer (FOCT) is a concern, with its wide use in smart grid. The FOCT long-term operation stability is related to whether FOCT can accurately measure the current in the smart grid, which affect the performance of the related equipment. In this paper, the long-term operation stability test results of the FOCTs in an 110kV smart substation...
Electronic current transformer (ECT) is widely used in smart grid, especially intelligent substation. However, fault is unavoidable for ECT in long term operation. In this paper, the fault of an 110kV independent ECT based on low-power current transformer is an example to analyze the reasons for the fault via reasonable analyzing methods and proposed the corresponding treatments.
The control strategy of DC-link voltage is one of the key techniques of shunt active power filter (SAPF). The DC-link voltage has an effect on reactive power compensation ability and power loss of SAPF. Based on the relationship between real-time load reactive power and DC-link voltage, an optimal DC-link voltage control strategy is proposed in the paper. The optimal DC-link voltage will maintain...
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