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Island fault ride-through control method and system for receiving end converter station of flexible direct current grid-connected system

A fault ride-through and control method technology, applied in the direction of information technology support system, AC network circuit, single network parallel feeding arrangement, etc., can solve the problems of long time consumption, inability to guarantee stable operation of the system, slow heat dissipation, etc., and achieve strong applicability and economy, and solve the effect of grid-side voltage overrun

Pending Publication Date: 2022-01-21
GUANGDONG POWER GRID CO LTD
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Problems solved by technology

[0004] The purpose of the present invention is to provide an island fault ride-through control method and system for the receiving end converter station of a flexible straight-to-grid system, so as to solve the problem of slow heat dissipation, time-consuming and inability to guarantee the system in the prior art for island fault ride-through control methods. Problems with stable operation

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  • Island fault ride-through control method and system for receiving end converter station of flexible direct current grid-connected system
  • Island fault ride-through control method and system for receiving end converter station of flexible direct current grid-connected system
  • Island fault ride-through control method and system for receiving end converter station of flexible direct current grid-connected system

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Embodiment Construction

[0055] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0056] It should be understood that the step numbers used herein are only for convenience of description, and are not intended to limit the execution order of the steps.

[0057] It should be understood that the terminology used in the description of the present invention is for the purpose of describing particular embodiments only and is not intended to limit the present invention. As used in this specification and the appended claims, the singular forms "a", "an"...

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Abstract

The invention discloses a flexible direct current grid-connected system receiving end converter station island fault ride-through control method and system, and the method comprises the steps: carrying out the island detection according to the network side information of a flexible direct current receiving end converter station, and judging whether the flexible direct current receiving end converter station enters an island state or not according to a detection result; when it is judged that the flexible direct current receiving end converter station enters the island state, corresponding fault control strategies are selected according to different fault types; determining fault duration, and adopting different fault ride-through strategies according to different fault duration; judging whether the fault is cleared or not, detecting a network side signal of the action circuit breaker after the fault is cleared, and overlapping and networking when the network side signal of the action circuit breaker meets a reclosing condition; and changing the control strategy of the flexible direct current receiving end converter station to recover the active power output of the flexible direct current receiving end converter station. According to the invention, the problem of network side voltage overrun can be solved, the service life of equipment is prolonged, the trouble of frequent start of the flexible direct current system due to temporary fault stop is prevented, and stable operation of the system is facilitated.

Description

technical field [0001] The invention relates to the field of protection and control of a flexible straight-to-grid system, in particular to an island fault ride-through control method and system for a receiving end converter station of a flexible straight-to-grid system. Background technique [0002] At present, the offshore wind power grid connection scheme mostly adopts the centralized connection mode with the wind farm group as the unit, which can reduce the engineering cost and improve the control ability of the power grid to connect to the wind farm. Compared with the wind farms, the economic and technical advantages Distributed access has obvious advantages. The transmission mode adopted for offshore wind power grid connection usually adopts high-voltage AC transmission or flexible DC transmission, and different transmission modes are adopted according to the distance from the offshore wind farm. The advantages of high-voltage AC transmission lie in its mature technol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38H02J3/40
CPCH02J3/388H02J3/40H02J2300/28Y04S10/52
Inventor 余浩任万鑫张志强左郑敏张哲萌林勇陈鸿琳彭穗宫大千
Owner GUANGDONG POWER GRID CO LTD
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