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Active-frequency control method and system for flexible direct-current grid connection of communication-free offshore wind farm

A frequency control, active frequency technology, applied in the field of new energy power generation, can solve problems such as changing the transmission power

Inactive Publication Date: 2019-11-22
GLOBAL ENERGY INTERCONNECTION RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Therefore, the active power-frequency control method and system for flexible straight-grid connection of offshore wind farms without communication provided by the present invention overcomes the defect in the prior art that the transmission power cannot be changed in response to frequency changes when the communication system fails

Method used

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  • Active-frequency control method and system for flexible direct-current grid connection of communication-free offshore wind farm
  • Active-frequency control method and system for flexible direct-current grid connection of communication-free offshore wind farm
  • Active-frequency control method and system for flexible direct-current grid connection of communication-free offshore wind farm

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Embodiment 1

[0041]Embodiments of the present invention provide an active power-frequency control method for flexible straight grid connection of offshore wind farms without communication, which can be applied to grid systems of offshore wind farms, such as figure 1 As shown, the offshore wind farm directly connects to the onshore AC system through the flexible grid, the offshore grid access point (GCP) and the public coupling point (PCC) are physically the same point, and the offshore wind farm directly connects to the onshore AC system through the DC access point (GAP). AC system. Such as figure 2 As shown, the control method includes the following steps:

[0042] Step S1: Obtain the first frequency signal of the access point of the onshore AC power grid. In the embodiment of the present invention, such as image 3 As shown, the control and protection module of the onshore converter station uses a phase-locked loop to measure the frequency of the onshore AC power grid access point in...

Embodiment 2

[0067] The embodiment of the present invention provides an active power-frequency control system for flexible straight grid connection of offshore wind farms without communication, such as Figure 7 shown, including:

[0068] The first frequency signal acquisition module 1 is used to acquire the first frequency signal of the access point of the onshore AC power grid; this module executes the method described in step S1 in Embodiment 1, which will not be repeated here.

[0069] The frequency / DC voltage conversion module 2 is configured to convert the first frequency signal into a DC voltage; this module executes the method described in step S2 in Embodiment 1, which will not be repeated here.

[0070] The DC voltage value control module 3 of the offshore converter station is used to use the DC voltage as the DC voltage reference value of the onshore converter station, and control the output DC voltage value of the onshore converter station to be equal to the DC voltage referenc...

Embodiment 3

[0078] An embodiment of the present invention provides a computer device, such as Figure 13 As shown, it includes: at least one processor 401 , such as a CPU (Central Processing Unit, central processing unit), at least one communication interface 403 , memory 404 , and at least one communication bus 402 . Wherein, the communication bus 402 is used to realize connection and communication between these components. Wherein, the communication interface 403 may include a display screen (Display) and a keyboard (Keyboard), and the optional communication interface 403 may also include a standard wired interface and a wireless interface. The memory 404 may be a high-speed RAM memory (Ramdom Access Memory, volatile random access memory), or a non-volatile memory (non-volatile memory), such as at least one disk memory. Optionally, the memory 404 may also be at least one storage device located away from the aforementioned processor 401 . Wherein the processor 401 can execute the activ...

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Abstract

The invention discloses an active-frequency control method and system for flexible direct-current grid connection of a communication-free offshore wind plant. Firstly, a frequency signal of a shore alternating current power grid access point is obtained, the frequency signal is converted into a generated direct current voltage to serve as a direct current voltage reference value of a shore converter station, and the shore converter station controls an output direct current voltage value to be equal to the direct current voltage reference value; the offshore converter station detects a direct-current voltage value and converts the direct-current voltage value into frequency to obtain a frequency reference value; the offshore converter station controls the frequency of the offshore common coupling point to be equal to the frequency reference value; the offshore wind farm acquires a second frequency signal of the offshore power grid; and active frequency modulation is performed on the offshore wind power based on the frequency reference value and the second frequency signal. Thus, an active-frequency control function of offshore wind power to an on-shore alternating current system through flexible direct access can be realized, frequency modulation of the alternating current system is supported, inter-station communication between a flexible direct shore station and an offshore station is not needed, communication between a flexible direct current and an offshore wind power plant is also not needed, the control reliability is improved, and the application range is widened.

Description

technical field [0001] The invention relates to the technical field of new energy power generation, in particular to an active power-frequency control method and system for flexible straight grid connection of a non-communication offshore wind farm. Background technique [0002] Based on the voltage source converter, the flexible DC transmission system has the advantages of no commutation failure, independent control of active power and reactive power, and the ability to supply power to passive networks. It provides an effective solution for renewable energy grid integration. In recent years, with the rapid development of large-scale and long-distance offshore wind power at home and abroad, a number of offshore flexible DC transmission projects are in the planning stage. In the future, offshore wind power can be directly connected to the onshore AC power grid through the flexibility. The transmission power of the wind farm is relatively large, and the frequency of the system...

Claims

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Application Information

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IPC IPC(8): H02J3/38H02J3/48H02M7/00
CPCH02J3/48H02M7/00Y02E10/76
Inventor 阳岳希杨杰许韦华杜镇宇涂莉孙同越吴学光程亭婷季兰兰
Owner GLOBAL ENERGY INTERCONNECTION RES INST CO LTD
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