Integrated topology design method for offshore wind farm based on HVDC transmission

A high-voltage direct current transmission and design method technology, applied in the direction of irreversible AC power input conversion to DC power output, AC network circuit, wind power generation, etc., can solve the problem of cost surge and achieve simple control, low cost, and high reliability Effect

Active Publication Date: 2019-07-02
ZHEJIANG UNIV
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Problems solved by technology

Therefore, the biggest obstacle to the development of higher power class PMSM is the exponential cost increase with back-to-back FRC class

Method used

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  • Integrated topology design method for offshore wind farm based on HVDC transmission
  • Integrated topology design method for offshore wind farm based on HVDC transmission
  • Integrated topology design method for offshore wind farm based on HVDC transmission

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specific Embodiment

[0113] In order to simplify the simulation, the present invention builds a relatively small offshore wind farm, integrated by HVDC. The test system consists of 12 2MW wind turbines based on permanent magnet synchronous generators. 6 sub-modules form one series branch and two parallel branches. The DC collector system transmits wind power to the onshore AC grid side through a subsea line and a high-power inverter based on a voltage source converter. The test system parameters are shown in Table 1.

[0114] Table 1

[0115]

[0116] According to the attached picture Figure 6-9 It can be seen that:

[0117] (1) The experimental results under the increase of wind speed are as follows: Image 6 As shown, the initial wind speed is 10m / s, and the generator operates at the maximum power tracking point. At t=2s, the wind speed increases to 12m / s, due to the imbalance between the mechanical power, the permanent magnet synchronous generator rotor speed increases, such as Imag...

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Abstract

The invention discloses an integrated topology design method for an offshore wind farm based on HVDC transmission. The method is characterized in that each permanent magnet synchronous generator is equipped with a full-bridge diode rectifier and a DC / DC boost chopper to form a cascaded sub-module; a plurality of sub-modules are connected in series and parallel to form a DC transmission system of the offshore wind farm; any unit that requires maintenance or has a fault in a series branch can be isolated from the system by a natural commutation process and does not affect other normal units in the same branch. The method has the advantages of low cost, low power consumption, high efficiency, high reliability, simple control and the like, can enhance the robustness of the system, reduces theinfluence of equipment unit failure or maintenance on the system, and has important engineering value and significance.

Description

technical field [0001] The present invention relates to a wind farm integrated topology design method, in particular to an offshore wind farm integrated topology design method based on high-voltage direct current transmission. Background technique [0002] With its clean and sustainable features, offshore wind energy has become one of the most promising and fastest-growing renewable energy sources. Harnessing wind energy, however, requires efficient and flexible control techniques to be able to efficiently integrate offshore wind power into the main grid. These challenges can be addressed by combining novel energy conversion systems with feasible integrated controls. [0003] In terms of wind energy conversion systems, two types of wind turbines based on doubly-fed induction generator (DFIG) and permanent magnet synchronous generator (PMSG) respectively dominate. Compared with permanent magnet synchronous motors based on full-rated converters (FRC), DFIG has economic advan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38H02J3/36H02M7/06
CPCH02J3/36H02J3/386H02M7/06Y02E10/76Y02E60/60
Inventor 张建良齐冬莲李真鸣
Owner ZHEJIANG UNIV
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