A Control and Protection System Configuration of a Flexible DC Polarization Access Topology

Abstract

The invention discloses a flexible DC pole splitting access topology structure and a configuration of a control and protection system thereof. The pole-splitting access topology includes: a sending-end AC system, a rectifying station, an HVDC transmission line, two inverter stations in different areas and two receiver AC systems; the sending end AC system is connected with the rectifying station,The positive pole of the DC line is connected to the first inverter station, the first inverter station is connected to the first receiving AC system through an AC outlet line, the negative pole of the DC line is connected to the second inverter station, the second inverter station is connected to the second receiving AC system through an AC outlet line, and the first inverter station or the second inverter station is connected to the ground electrode region through a low-voltage cable. The control and protection system includes a station control layer, a pole control layer, a measurement system and a communication system. The invention can avoid the operation risk of the large-capacity flexible DC single-point access AC system, safely transmit the set active power, and reduce the influence of the DC system fault on the receiving end AC system.

Description

technical field [0001] The invention relates to the technical field of electric power transmission and distribution, in particular to a configuration of a control and protection system for flexible direct current polarized access topological structure. Background technique [0002] The traditional flexible DC transmission system generally adopts a single-point feed-in method, that is, the two poles of the flexible DC system are connected to the receiving end grid of the same voltage level. Since the two ends of the flexible DC transmission system can control two physical quantities, a reasonable combination of control variables is usually that the rectifier end controls the active power and reactive power on the AC side, and the inverter end controls the DC voltage and reactive power on the AC side. [0003] With the increase of flexible DC transmission systems and the increase of line transmission capacity in the future, it will become an important problem for the developme...

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Problems solved by technology

[0003] With the increase of flexible DC transmission systems and the increase of line transmission capacity in the future, it will become an important problem for the development of China's power grid that the large-capacity DC fed into the load center of the receiving end will be concentrated. The level increases, and the outage of the DC fault will cause a huge impact on the AC power grid at the receiving end

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