Dynamic energy leakage apparatus, device and DC transmission system

Abstract

The invention discloses a dynamic energy leakage apparatus, device and a DC transmission system. The dynamic energy leakage apparatus comprises: a first switch disposed between the energy leakage apparatus and a positive electrode connection end and / or a negative electrode connection end, a controllable switching module for controlling the dynamic leakage apparatus to be put into or removed from adirect current transmission line, an energy leakage module with one end connected to a first end of the controllable switching module, which is used to consume DC power, a voltage support module withone end connected to a second end of the controllable switching module and the other end connected to the other end of the leakage module, which is used to provide voltage to a inverter block on theinverter side. When the fault of the continuous commutation failure of the DC transmission system is cleared, the first switch is disconnected, in this way, the dynamic energy leakage apparatus can bequickly cut off to avoid the problem of slow system recovery caused by the charging of the voltage support module during the recovery of the DC power supply system, and the system can be returned tonormal operation more quickly.

Description

technical field [0001] The invention relates to the technical field of direct current transmission, in particular to a dynamic energy discharge device, equipment and a direct current transmission system. Background technique [0002] With the gradual implementation of the "West-to-East Power Transmission" strategy, the UHV DC transmission project has been put into operation intensively, and my country has built the AC-DC hybrid power grid with the largest capacity and the most complex topology in the world. The continuous improvement of UHV DC single-circuit transmission capacity makes the characteristics of "strong DC and weak AC" appear, which are mainly reflected in: first, the receiving end power grid is mostly a load center, and multiple DC feed-in locations are concentrated, and the electrical distance between inverter stations is relatively short. Nearby, the failure of the AC system near the converter station may lead to multiple DC commutation failures at the same t...

AI Technical Summary

Problems solved by technology

The continuous improvement of UHV DC single-circuit transmission capacity makes the characteristics of "strong DC and weak AC" appear, which are mainly reflected in: first, the receiving end power grid is mostly a load center, and multiple DC feed-in locations are concentrated, and the electrical distance between inverter stations is relatively short. Nearby, the failure of the AC system near the converter station may lead to multiple DC commutation failures at the same time; the second is that the sending-end power grid is an energy-concentrated area, and the connection of the AC system is relatively weak. Interruption will cause some important sections of the power grid at the sending end to exceed the stability limit, some thermal power units will overspeed, and wind turbines will be disconnected from the grid due to low voltage or high voltage on a large scale, seriously threatening the safe and stable operation of the system

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