Annular direct current power distribution network fault detection method based on voltage prediction

Abstract

The invention provides an annular direct current power distribution network fault detection method based on voltage prediction, and belongs to the field of safe operation of a direct current power distribution network. Two ends of the direct current power distribution network are each provided with a protection device which includes a breaker, a sensor, a relay and an electric reactor. The annulardirect current power distribution network fault detection method based on voltage prediction is characterized by: predicting a prediction voltage value at a next moment on a line side according to sampling voltage values of any three sampling time points on the line side, and using the difference between the prediction voltage value and the measured voltage value on the line side at the fault time as an action basis for protection. The annular direct current power distribution network fault detection method based on voltage prediction solves the problems that the protection of a conventionalDC power distribution network is low in quickness, and relies too much on communication and the damping state of the circuit. The annular direct current power distribution network fault detection method based on voltage prediction only relies on the voltage value on the line side, and effectively avoids the influence of relying too much on the damping state of the circuit at the fault time when the operating current, the first derivative and the second derivative of the current, the first derivative of the voltage and other elements set protection.

Description

Technical field [0001] The invention relates to the field of relay protection for DC distribution networks, in particular to a ring DC distribution network fault detection method based on predicted voltage, which is suitable for complex multi-terminal DC distribution networks. Background technique [0002] In recent years, with the continuous development of science and technology, the power consumption in load-intensive areas is increasing, and users' requirements for power quality are becoming more and more stringent. The existing AC power distribution system can no longer meet the power needs of users. . In the DC distribution network, the control of active and reactive power on the AC side is independent, and there are no problems such as frequency offset and three-phase asymmetry in the DC network. The power quality is better, and the DC distribution system gradually Into people's field of vision. With its advantages of low cost, low line loss, large transmission capacity, ...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problems of difficulty in fault detection of multi-terminal DC distribution network (the fault detection of terminal DC distribution network is currently in the stage of theoretical research and has no application practice), too much dependence on the circuit damping state, and difficulty in satisfying the quickness of DC protection, the present invention proposes a A Fault Detection Method for Ring DC Distribution Network Based on Predicted Voltage

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