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Offshore wind power flexible direct current grid-connected system alternating current fault ride-through method based on energy regulation and control

An offshore wind power and fault ride-through technology, which is applied in the direction of power transmission AC network, wind power generation, AC network circuit, etc., to reduce the current change rate, solve waste, and improve the effect of operating characteristics

Active Publication Date: 2022-01-25
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

[0004] Aiming at the defects of existing surplus power coping methods, the present invention provides an AC fault ride-through method and device based on energy regulation for offshore wind power grid-connected flexible grid-connected systems. Economical; at the same time improving the working characteristics of existing energy consumers

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  • Offshore wind power flexible direct current grid-connected system alternating current fault ride-through method based on energy regulation and control
  • Offshore wind power flexible direct current grid-connected system alternating current fault ride-through method based on energy regulation and control
  • Offshore wind power flexible direct current grid-connected system alternating current fault ride-through method based on energy regulation and control

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[0034] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not constitute a conflict with each other.

[0035] In the present invention, the terms "first", "second" and the like (if any) in the present invention and drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.

[0036] refer to figure 2, which is a flow diagram of an AC fault ride-through method for an offshore wind power flexible grid-connected system based on energy re...

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Abstract

The invention discloses an offshore wind power flexible direct current grid-connected system alternating current fault ride-through method based on energy regulation and control and belongs to the technical field of power transmission and distribution of power systems. According to the method, after an AC system at a receiving end fails, a DC voltage reference value is raised to a preset value of DC voltage, the capacitance energy reference value of a shore converter station is controlled to follow the actual value of the shore converter station; when the capacitance energy of the shore converter station reaches an early warning value, the capacitance energy reference value of an offshore converter station is raised to a preset maximum value, and then, the capacitance energy reference value of the offshore converter station is kept constant; and when the capacitance energy of the shore converter station reaches a preset maximum value, the AC power of the shore converter station is detected, calculation is performed to obtain the surplus power of a DC side, and the energy consumption power reference value of a DC energy consumption device is controlled to follow the surplus power. Therefore, waste caused by the surplus power and heat dissipation can be reduced, the operation economy is improved, and the operation characteristics of the energy consumption device are improved.

Description

technical field [0001] The invention belongs to the technical field of electric power transmission and distribution, and more particularly relates to an AC fault ride-through method for an offshore wind power grid-connected system based on energy regulation. Background technique [0002] Offshore wind power has become the focus of wind power development in recent years because it is closer to the load center and has more abundant wind resources. Modular Multilevel Converter-HVDC (MMC-HVDC) technology based on modular multilevel converter is an important technical way to realize offshore wind power transmission and grid connection. Such as figure 1 As shown, the offshore wind power grid-connected system based on MMC-HVDC consists of offshore wind farms, offshore converter stations, submarine cables, onshore converter stations, and AC main grid. When the onshore AC side fails, the active power transmitted by the DC system to the AC main grid through the onshore converter sta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/36H02J3/38
CPCH02J3/36H02J3/381H02J2203/20H02J2300/28Y02E10/76Y02E60/60
Inventor 向往张浩博周猛文劲宇
Owner HUAZHONG UNIV OF SCI & TECH
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