Emergency shutdown control device for double-water-internal-cooling phase modifier

Abstract

The invention particularly relates to an emergency shutdown control device for a double-water internal-cooling phase modifier. The emergency shutdown control device comprises a main central processing unit, a slave central processing unit, a man-machine interaction device, an emergency stop manual device, a manual stop output unit, a signal input unit, a signal output unit A and a signal output unit B; and further comprises an SFC device which is used for realizing overspeed protection to prevent overspeed protection maloperation after grid connection of the phase modifier. According to the invention, the protection host of the double-water internal-cooling phase modifier can be separated from a DCS control system, a control function is realized in the DCS system, a thermotechnical protection tripping function is realized in the emergency shutdown control device, when the control system is abnormal, the protection system can still act normally, and the reliability is higher. Compared with a non-electric quantity protection screen of a modulation group, complex control logic and functions can be conveniently added, the expansibility and the flexibility are high, and the maintenance workload is small.

Description

technical field [0001] The invention belongs to the technical field of thermal protection, and in particular relates to an emergency shutdown control device for a double-water internal cooling type condenser. Background technique [0002] In recent years, the extensive construction of UHV transmission projects has caused changes in the characteristics of the power grid. The response speed of conventional power and electronic equipment is slow, and it cannot quickly provide sufficient dynamic reactive power support for the system during a fault, resulting in a decrease in the system voltage stability margin. The inherent fast dynamic reactive power output characteristics of the condenser just make up for this shortcoming, and it has been re-used in the era of "big power grid", providing strong support for the construction of a backbone power grid with new energy as the main body. [0003] The regulator at the sending end converter station improves the stability of the AC bus...

AI Technical Summary

Problems solved by technology

[0005] However, at present, there are many DCS manufacturers of condensers, with different technical routes, and the processing of emergency shutdown control systems in DCS is also different, and there are even differences between different sites of different DCS manufacturers.

The "two out of three" logic for thermal protection of some condensers is not redundantly configured in terms of input loop, output loop, and controller configuration; Redundant configuration is carried out, but the two-out-of-three logic is implemented in the DCS system and the non-electricity protection screen of the modulation group. After two out-of-three operations, the redundancy is excessive, which is not conducive to maintenance; a dual water-cooled condenser Most of the thermal protection "two out of three" logic is implemented in the non-power protection screen of the modulation group, but some protection needs to be logically calculated in the DCS, so there are still some thermal protections in this station that pass through the DCS system and then are exported to The case of non-battery protection screen

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