Frequency control method of offshore wind power integration multi-terminal flexible DC transmission system

A DC transmission system, multi-terminal flexible technology, applied in the direction of electrical components, etc., can solve the problems of AC and DC system security and stability performance, AC system impact, etc., to reduce the impact of security and stability, improve frequency characteristics, and eliminate steady-state frequency deviation Effect

Active Publication Date: 2017-02-15
ZHEJIANG UNIV +2
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Problems solved by technology

At present, the literature only focuses on improving the frequency stability of the AC system through the frequency control of the converter station in the case of active power fluctuations in the AC system, but there are few literatures that mention the safety and stability of the AC-DC system when the converter station fails and exits operation. performance impact
When the transmission power of the converter station is large and the inertia of the AC system is

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  • Frequency control method of offshore wind power integration multi-terminal flexible DC transmission system
  • Frequency control method of offshore wind power integration multi-terminal flexible DC transmission system
  • Frequency control method of offshore wind power integration multi-terminal flexible DC transmission system

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Embodiment Construction

[0040] In order to describe the present invention more specifically, the technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0041] by figure 1 The shown offshore wind farm is connected to the multi-terminal flexible DC transmission system as an example. The system connected to the offshore wind farm is a seven-terminal flexible DC transmission system, and the four-terminal onshore converter station is connected to the 39-node system on the left, with a capacity of 900MVA; The onshore converter stations at both ends are connected to the four-machine system on the right, with a capacity of 600MVA. The capacity of the wind farm side converter station is 4.5GVA. During steady-state operation, the onshore converter station adopts droop control. The VSC-MTDC system transmits 2000MW and 1000MW to the 39-node system and the four-machine system respectively. The parameters of the droop ...

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Abstract

The invention discloses a frequency control method of an offshore wind power integration multi-terminal flexible DC transmission system. When a shore-based converter station exits, asynchronous power grid transient frequency deviation drop and wind farm additional pitch angle control are realized through reasonable configuration of the controllers of a converter station in a power grid at a receiver side and through wind farm additional virtual inertia control, and asynchronous power grid steady-state frequency deviation is eliminated eventually. Thus, the frequency characteristic of adjacent asynchronous power grids is improved, and the influence of failure of a converter station on the operation safety and stability of other shore-based asynchronous power grids is reduced. By using the method to analyze the exit of a shore-based converter station of a large-capacity offshore wind farm integration multi-terminal flexible DC transmission system, the designed frequency control strategy can improve the frequency stability of a shore-based AC system.

Description

technical field [0001] The invention belongs to the technical field of power systems, and in particular relates to a frequency control method for connecting offshore wind power to a multi-terminal flexible direct current transmission system. Background technique [0002] In the face of the rapid consumption of fossil energy and the increasingly severe environmental governance, new energy represented by wind power is a key measure to achieve sustainable development of energy and the environment. With the limitation of land resources and wind power resources, and important progress in the development and application of offshore wind power, offshore wind power has become an important direction for the development of wind power. According to the forecast of the European Wind Energy Association, the installed capacity of offshore wind farms in Europe will reach 40GW and 150GW in 2020 and 2030, respectively. In China, the National Energy Administration issued the "National Offsho...

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Application Information

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IPC IPC(8): H02J5/00
CPCH02J5/00Y02E60/60
Inventor 徐政董桓锋刑法财杨勇徐谦孙黎滢徐晨博杨升峰张利军黄锦华
Owner ZHEJIANG UNIV
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