Energy consumption module, offshore wind power flexible DC transmission system, and fault ride-through strategy

A technology of offshore wind power and external transmission system, which is applied in wind power generation, power transmission AC network, conversion of AC power input to DC power output, etc., and can solve the problem of high cost, small change rate, du/dt and di/dt change rate Large and other problems, to achieve the effect of small loss, prevent rejection failure, and ensure communication

Pending Publication Date: 2020-03-06
XIDIAN POWER RECTIFIER XIAN +2
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The former has a small change rate of du/dt and di/dt, which can realize smooth and controllable discharge, but the

Method used

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  • Energy consumption module, offshore wind power flexible DC transmission system, and fault ride-through strategy
  • Energy consumption module, offshore wind power flexible DC transmission system, and fault ride-through strategy

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[0015] The present invention will be described in detail below with reference to the drawings and specific embodiments.

[0016] See figure 1 , A new type of DC chopping energy consumption scheme and its fault ride-through strategy of the present invention, including wind farms and their ancillary equipment, offshore converter stations and onshore converter stations, the MMC of the onshore converter stations integrates distributed internally DC chopper DCChopper. The electric energy sent from offshore wind farms is sent to the onshore AC system through offshore converter stations, DC cables, and onshore converter stations in turn.

[0017] The flexible direct current transmission system can adopt symmetrical unipolar connection mode or symmetrical bipolar connection mode. The modular DC energy consumption device is integrated in the modular multi-level converter (MMC). Each DM submodule contains an energy dissipation resistor R, which evenly distributes the energy consumption pow...

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Abstract

The invention discloses an energy consumption module, an offshore wind power flexible DC transmission system, and a fault ride-through strategy applied to the offshore wind power flexible DC transmission system. A DC chopper module is integrated into the MMC of an onshore converter station. The DC chopper module uses a modular arrangement and is connected in series with the SM sub-modules of the MMC. The DC chopper module does not contain capacitor components. When an onshore AC fault occurs in the offshore wind power flexible DC transmission system, the DC voltage rises sharply. A certain number of DC chopper modules (DMs) are introduced to consume surplus power through the energy-consuming resistors to maintain the system's short-term stability. After the fault is removed, the corresponding DMs are removed in order to complete the system fault ride-through. Through the modular arrangement of DMs in a bypass state during normal operation, not only can the precise matching of the surplus power be achieved, the electrical quantity fluctuations of the switching process of the chopper device can be greatly reduced, and fault ride-through and isolation are realized, but also the DM issimple in structure and good in economical efficiency.

Description

technical field [0001] The invention belongs to the technical field of an onshore AC system for sending offshore wind power through a flexible DC transmission, and in particular relates to a novel DC chopper (DC Chopper) energy consumption scheme and a fault ride-through strategy. Background technique [0002] When the offshore wind power is transmitted to the onshore AC system through the flexible direct current transmission system, due to the application of the flexible direct current transmission system, especially the MMC converter technology, it can effectively isolate the fault of the offshore wind power system and prevent the fault of the isolated offshore wind power system from spreading to the land AC system. However, when the onshore AC system fails, the power transmission of the offshore wind power system is blocked, and the excessive energy cannot be sent out, which will cause serious overvoltage in the DC system, and even cause the shutdown of the offshore wind ...

Claims

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Application Information

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IPC IPC(8): H02J3/36H02J3/38H02M7/483
CPCH02J3/36H02M7/483H02M1/0038H02M1/0054H02M7/4835Y02B70/10Y02E10/76Y02E60/60
Inventor 苏匀李少华姚东晓马小婷沈开奎蒋大海马松江涂小刚李孝维
Owner XIDIAN POWER RECTIFIER XIAN
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