Phase modifier emergency control method and system capable of suppressing direct-current consequential commutation failure

Abstract

The invention, which belongs to the technical field of the power system and automation realization, discloses a phase modifier emergency control method and system capable of suppressing a direct-current consequential commutation failure. The method comprises: a direct-current commutation failure information sub station sends direct-current commutation failure information to an emergency control master station; the emergency control master station obtains bus voltage information of a direct-current inverter station with a commutation failure and all phase modifier operation information in a grid; the emergency control master station matches a proper emergency control measure from a control strategy table and sends the measure to a phase modifier control execution station; and the phase modifier control execution station sends an excitation reference voltage modification instruction and a duration time instruction to a phase modifier excitation system to complete phase modifier emergency control. According to the invention, because participation in grid emergency control is realized by using the phase modifier, a direct-current consequential commutation failure probability of a multi-direct-current feed-in receiving end is reduced, interlocking of the direct current due to multi-times commutation failures is prevented, and the large-area power outage caused by multi-direct-current interlocking can be prevented.

Description

technical field [0001] The invention belongs to the technical field of electric power system and automation thereof. More precisely, the invention relates to an emergency control method and system for a phase regulator to suppress the failure of DC continuous commutation. Background technique [0002] With the rapid development of UHV DC, it has played an important role in realizing the large-scale optimal allocation of resources in my country. However, during the transition period of UHV power grid construction, the characteristics of the power grid's "strong direct current and weak AC" are obvious, and the safe operation of the system faces greater risks. Under the new pattern of multi-DC intensive feed-in, the degree of dependence on receiving external power continues to increase. With the economic development entering the new normal, under the background of slow load growth, a large number of local units of the UHVDC receiving end power grid are shut down, and the dynami...

AI Technical Summary

Problems solved by technology

A large number of simulation analyzes show that after the condenser is put into operation, the probability of DC commutation failure in the multi-DC feed-in receiving end grid can be greatly reduced. However, only relying on the spontaneous response of the condenser, it is still impossible to avoid the failure of multiple DC continuous commutation after a serious fault. , the dynamic reactive power support capability of the condenser is not fully utilized, and it is necessary to explore the operation mode of the condenser participating in the power grid control

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