Offshore wind plant flexible direct current power transmission system and black start method

A technology for power transmission systems and wind farms, applied in wind power generation, power transmission AC networks, circuit devices, etc., can solve problems such as high cost and complex maintenance of energy storage systems, reduce construction costs, solve capacity shortages, and increase power effect of factors

Pending Publication Date: 2022-06-03
POWERCHINA FUJIAN ELECTRIC POWER SURVEY & DESIGN INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this patent, energy storage elements are added to the converters on the side of each wind turbine for the black start of the wind turbines. For offshore wind farms, more scattered energy storage elements need to be configured to start the entire wind farm, which is expensive and the energy storage system maintenance is also more complex

Method used

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  • Offshore wind plant flexible direct current power transmission system and black start method

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Effect test

Embodiment 1

[0035] like figure 1 As shown, a flexible and direct power transmission system for an offshore wind farm includes: a hybrid energy storage module, an offshore wind farm power collection group electrically connected in sequence, an offshore booster station, a sending-end converter station, and a receiving-end converter station.

[0036] The power collection group of the offshore wind farm includes several wind turbines, transformers, and 35kV busbars.

[0037] Hybrid energy storage modules include power-type energy storage elements (such as supercapacitors) and energy-type energy storage elements (such as lithium batteries). The power type energy storage element is electrically connected to the 35kV busbar through the AC-DC converter to establish the voltage and frequency of the power transmission system. The energy-type energy storage element is electrically connected to the 35kV busbar through an AC-DC-AC converter to stabilize the voltage and frequency of the power transmis...

Embodiment 2

[0040] A black start method for a flexible direct power transmission system of an offshore wind farm, comprising the following steps:

[0041] a) Preliminary preparation

[0042] Predict the power required at the initial black start of the flexible direct transmission system; the power required at the initial black start includes the initial starting power of each equipment in the flexible direct transmission system, the transformer loss, the initial load of the fan, etc.;

[0043] According to the power required at the initial stage of black start, check whether the capacity S1 of the hybrid energy storage module meets the capacity required by the load at the initial stage of black start, and calculate the number N1 of the fans that start first according to the power of the fans that start first;

[0044] Determine the configuration of other primary equipment required for system black start, such as cable feeder, fan filter, reactor and other reactive power losses;

[0045] ...

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Abstract

The invention relates to an offshore wind power plant flexible direct current power transmission system and a black start method. The system comprises an offshore wind power plant current collection group, an offshore booster station, a sending end converter station and a receiving end converter station which are electrically connected in sequence. A hybrid energy storage module is arranged in the offshore wind power plant current collection group; the hybrid energy storage module comprises a power type energy storage element and an energy type energy storage element, the power type energy storage element is used for establishing the voltage and frequency of the power transmission system, and the energy type energy storage element is used for stabilizing the voltage and frequency of the power transmission system.

Description

technical field [0001] The invention relates to a flexible direct power transmission system and a black start method for an offshore wind farm, and belongs to the field of black start of flexible direct power transmission systems. Background technique [0002] Flexible DC transmission is a new transmission technology based on voltage source converters, self-switching devices and pulse width modulation (PWM). With the large-scale development of offshore wind farms, the flexible DC transmission method solves the problem that AC submarine cables cannot be transmitted over long distances due to high capacitive charging power, and is the main way to transmit electrical energy from deep-sea wind farms. However, during daily maintenance, fault maintenance, especially the long-term shutdown caused by severe weather such as typhoons, the power loss of offshore wind turbines, booster stations, converter stations and other systems is also disconnected from the large onshore power grid,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/36H02J3/32H02J3/38H02J3/24
CPCH02J3/36H02J3/32H02J3/38H02J3/241H02J2300/28Y02E60/60
Inventor 张居谋詹银陈斐泓王雄文方乙君柳松董建政代妍妍林琼斌陈志华
Owner POWERCHINA FUJIAN ELECTRIC POWER SURVEY & DESIGN INST CO LTD
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