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Flexible direct current power transmission system of energy storage type offshore wind plant and fault ride-through method of flexible direct current power transmission system

A DC fault ride-through and power transmission system technology, applied in wind power generation, power transmission AC network, electrical components, etc., can solve the problems of high manufacturing cost, complex structure, and high requirements for sub-module integration, and achieve improved utilization and communication requirements. Low, cost-reducing effect

Pending Publication Date: 2022-03-22
POWERCHINA FUJIAN ELECTRIC POWER SURVEY & DESIGN INST CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

3. Add dissipation resistors or energy storage devices to the MMC sub-modules for DC fault ride-through. This solution requires high integration of sub-modules, high manufacturing costs, and complex structure increases the failure rate of sub-modules. At the same time, daily maintenance is complicated

Method used

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  • Flexible direct current power transmission system of energy storage type offshore wind plant and fault ride-through method of flexible direct current power transmission system
  • Flexible direct current power transmission system of energy storage type offshore wind plant and fault ride-through method of flexible direct current power transmission system
  • Flexible direct current power transmission system of energy storage type offshore wind plant and fault ride-through method of flexible direct current power transmission system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] seefigure 1 , an energy storage type offshore wind farm flexible direct transmission system includes:

[0049] The offshore wind turbine is connected to the subsea AC cable through the wind turbine side transformer to connect to the confluence bus of the offshore confluence booster station; the confluence bus connects the cable to the step-up transformer to connect to the offshore converter station; the offshore converter station is connected to the onshore converter through the submarine DC cable Station connection; the onshore converter station is connected to the onshore AC power grid through the onshore AC cable.

[0050] The offshore converter station is equipped with a fault detection module and an offshore fault ride-through module; the onshore converter station is equipped with an onshore fault ride-through module. The fault detection module communicates with the offshore fault ride-through module to determine whether a DC fault occurs, and sends a fault signal ...

Embodiment 2

[0054] On the basis of Embodiment 1, the offshore converter station is connected with a DC voltage acquisition module. The DC voltage acquisition module collects the DC voltage data of the primary side of the offshore converter station and sends it to the DC fault detection module.

Embodiment 3

[0056] On the basis of Embodiment 1, the busbar of the offshore confluence booster station is electrically connected to a wind farm power acquisition module. The wind farm power collection module collects the wind farm output power P w sent to the energy storage control module. The energy storage module is electrically connected to the battery capacity acquisition module, and the battery capacity acquisition module detects the remaining capacity data of the energy storage module and sends it to the energy storage control module.

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PUM

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Abstract

The invention relates to an energy storage type offshore wind farm flexible direct current power transmission system. The system comprises a wind turbine generator, a fan side transformer, an offshore confluence booster station, an offshore converter station and an onshore converter station which are electrically connected in sequence; the offshore converter station is internally provided with a fault detection module and an offshore fault ride-through module. A land fault ride-through module is arranged in the land converter station; and an energy storage module and an energy storage control module are arranged in the offshore confluence booster station.

Description

technical field [0001] The invention relates to an energy storage type offshore wind farm flexible direct transmission system and a fault ride-through method thereof, belonging to the fault ride-through field. Background technique [0002] Flexible DC transmission is a new transmission technology based on voltage source converters, self-switching devices and pulse width modulation (PWM). This technology has the advantages of supplying power to the passive network, no commutation failure, no communication between commutation stations, and easy construction of multi-terminal DC systems. The flexible direct transmission system has high requirements for troubleshooting and ride-through. At present, there are mainly DC circuit breakers, new MMC sub-modules or structural topology of the flexible direct transmission system to solve the DC fault in the flexible direct transmission system. In application, the flexible direct transmission structure with DC fault ride-through capabil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/36H02J3/38H02J3/28H02J3/32H02H7/26
CPCH02J3/36H02J3/381H02J3/28H02J3/32H02H7/26H02J2300/28Y02E10/76Y02E60/60Y02E70/30
Inventor 詹银张居谋董建政王雄文代妍妍陈斐泓严哲谢子骏林琼斌詹一雄
Owner POWERCHINA FUJIAN ELECTRIC POWER SURVEY & DESIGN INST CO LTD
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