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Active frequency control method and system based on offshore wind power plant flexible-direct current system

A technology of active frequency and control method, which is applied in the field of new energy power generation, and can solve problems such as the inability to support frequency modulation of onshore AC systems

Inactive Publication Date: 2019-11-12
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 frequency control method and system based on the flexible straight system of the offshore wind farm provided by the present invention overcomes that the existing technology does not adjust the active power value output by the offshore wind farm according to the frequency of the onshore AC system, and cannot support the onshore AC. Defects of system tuning

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  • Active frequency control method and system based on offshore wind power plant flexible-direct current system
  • Active frequency control method and system based on offshore wind power plant flexible-direct current system
  • Active frequency control method and system based on offshore wind power plant flexible-direct current system

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Embodiment 1

[0040]Such as figure 1 As shown, the embodiment of the present invention provides an active frequency control method based on the flexible straight system of an offshore wind farm, and the control method includes the following steps:

[0041] Step S1: Obtain the frequency signal of the access point of the AC power grid of the shore AC system. In the embodiment of the present invention, such as image 3 Shown is a frequency-based frequency active power control transfer function block diagram. In the figure, the onshore AC system uses a phase-locked loop (PLL) to measure the frequency of the AC grid access point of the onshore AC system in real time, and generates the first frequency signal after first-order filtering , is just an example, not a limitation.

[0042] Step S2: Transmit the frequency signal to the frequency active power modulation module in the onshore converter station.

[0043] Step S3: Using the frequency active power modulation module based on the frequency ...

Embodiment 2

[0057] Such as Figure 15 As shown, the embodiment of the present invention also provides an active frequency control system of an offshore wind farm, including:

[0058] The frequency signal acquisition module 1 is used to acquire the 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.

[0059] The frequency signal transmission module 2 is used to transmit the frequency signal to the frequency active power modulation module in the onshore converter station. This module executes the method described in step S2 in Embodiment 1, which will not be repeated here.

[0060] The power adjustment amount generating module 3 is configured to use the frequency active power modulation module to generate a power adjustment amount based on the frequency signal. This module executes the method described in step S3 in Embodiment 1, which will not be repeated here.

[0061]...

Embodiment 3

[0069] An embodiment of the present invention provides a computer device, such as Figure 17 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 based on an offshore wind farm flexible-direct current system. The method comprises the steps: obtaining a frequency signal of a shore AC power grid access point, and transmitting the frequency signal to a frequency active modulation module in a shore converter station; generating a power regulation quantity by using the frequency active modulation module based on the frequency signal; detecting whether a first inter-station communication system and a second inter-station communication system are normal or not; when both thefirst inter-station communication system and the second inter-station communication system are normal, sending the power regulation quantity to an offshore wind plant control system through the firstinter-station communication system and the second inter-station communication system; and modulating the active power output by the offshore wind plant according to the power regulation quantity received by the offshore wind plant control system. Modulation of active power output by the offshore wind power plant is realized, so that a shore alternating current system is supported for frequency modulation, and offshore wind power is flexibly and directly accessed to the frequency active power regulation function of the shore alternating current power grid access point.

Description

technical field [0001] The invention relates to the technical field of new energy power generation, in particular to an active frequency control method and system based on a flexible straight system of an 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 has a certain influence ...

Claims

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Application Information

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IPC IPC(8): H02J3/38H02J3/48
CPCH02J3/48Y02E10/76
Inventor 李方媛林畅朱琳寇龙泽阳岳希吴学光
Owner GLOBAL ENERGY INTERCONNECTION RES INST CO LTD