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Fault joint ride-through method and device sent out by wind power plant through flexible direct current island

A flexible direct current, wind farm technology, applied in wind power generation, electrical components, control generators, etc., can solve low voltage and other problems

Pending Publication Date: 2021-07-02
XIAN XJ POWER ELECTRONICS TECH +4
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a combined fault ride-through method and device for wind farms sent through flexible DC islands, which is used to solve the low voltage ride-through problem of wind farms sent through flexible DC islands in the prior art

Method used

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  • Fault joint ride-through method and device sent out by wind power plant through flexible direct current island
  • Fault joint ride-through method and device sent out by wind power plant through flexible direct current island
  • Fault joint ride-through method and device sent out by wind power plant through flexible direct current island

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Embodiment Construction

[0032] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings.

[0033] Method Example:

[0034] According to the "NBT 31066-2015 wind power unit electrical simulation model modeling", the exchange fault is divided into three stages of the fault, during the fault, the fault, where the fault period and the fault each include transient interval and steady-state intervals. Where the transient section is a fluctuation section caused by the current, active power and reactive power fluctuations caused by the transient fluctuation. The steady-state interval is a range of stable operation after normal operation and voltage fluctuation. This division method is suitable for simulation output and actual The contrast test of the data. Therefore, in order to facilitate the control strategy of the low voltage crossing of the wind electric field and the delivery station switching station, in this embodiment, when the alternat...

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Abstract

The invention relates to a fault joint ride-through method and device for a wind power plant sent out through a flexible direct current island, and the method comprises the steps: switching the mode of a sending end converter from a constant alternating current voltage control mode to a constant current control mode when an alternating current side line of a sending end converter station has a short-circuit fault; switching the mode of a machine-side converter of the wind turbine generator from a fixed active / reactive power double-loop control mode to an active current priority control mode, so the alternating voltage amplitude during a fault period is improved as much as possible while the stability of the alternating voltage is ensured, and the quick recovery of the fault is facilitated. According to the invention, through cooperative control of the wind power plant and the sending end converter station, the AC side voltage is stably recovered, so fault joint ride-through is realized.

Description

Technical field [0001] The present invention belongs to the field of flexible DC transmission and large-scale new energy sources, and specifically, the fault combined passage method and apparatus of the wind farm is flexible. Background technique [0002] With the increasing outlook on energy shortage and environmental protection, new energy represented by wind power is rapidly developed. Typically, the wind farm is found to establish an area of ​​AC grids, and the access to large-scale wind power is easy to cause a decrease in voltage level, transmission power overrun, transient stability changes, and flexible DC transmission based on modular multi-substrate converter The system has the advantages of active and reactive power independent control, can be island mode operation, so the wind farm is incorporated into the AC grid to solve the reliable access problem of new energy. [0003] Such as figure 1 As shown, when the wind farm is sent out of the line (i.e., the AC side line o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38H02J3/48H02J3/50H02P9/10H02P101/15
CPCH02J3/48H02J3/50H02P9/105H02P9/107H02P2101/15Y02E10/76
Inventor 刘启建杨美娟行登江李道洋王先为吴金龙
Owner XIAN XJ POWER ELECTRONICS TECH
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