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Power balancing device for offshore wind power flexible direct current sending-out system and control method

A power balance, offshore wind power technology, applied in output power conversion devices, emergency protection circuit devices for limiting overcurrent/overvoltage, circuit devices, etc. The problems of large overvoltage and poor reliability on the DC side can achieve the effects of smooth recovery, increased impedance and convenient operation.

Pending Publication Date: 2020-06-12
TBEA XIAN FLEXIBLE TRANSMISSION & DISTRIBUTIONCO +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Distributed energy consumption devices have high cost and poor economy; and device series centralized energy consumption devices are difficult to manufacture and have poor reliability, and the above two technical routes cannot solve the problem of large overvoltage on the DC side

Method used

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  • Power balancing device for offshore wind power flexible direct current sending-out system and control method
  • Power balancing device for offshore wind power flexible direct current sending-out system and control method
  • Power balancing device for offshore wind power flexible direct current sending-out system and control method

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Embodiment Construction

[0029] In order to make the purpose and technical solution of the present invention clearer and easier to understand. The present invention will be further described in detail below in conjunction with the drawings and embodiments. The specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0030] combine first figure 1 The operating characteristics of the offshore wind power flexible direct current transmission system and the design principle of the present invention are described.

[0031] figure 1 It is a typical topology of flexible DC transmission system for offshore wind power. A typical offshore wind power flexible direct transmission system consists of an offshore wind farm, an AC collection system, an AC booster station, an offshore flexible DC converter station, a DC transmission system, and an onshore converter station. The converter valves of the offshore converter station, etc. The equipment is l...

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Abstract

The invention discloses a power balancing device for an offshore wind power flexible direct current sending-out system and a control method. The high-reliability power balancing device is formed by connecting three parts in series, namely a switch stage, a trigger stage, an energy consumption stage and a controllable reactor. The switch stage is formed by connecting at least one fully-controlled high-power power electronic device and a lightning arrester MOA1 in parallel. The trigger stage is formed by connecting a plurality of thyristors in series, and the number of the thyristors is determined according to the voltage of the MMC port. The thyristor level and the lightning arrester MOA2 are connected in parallel to form a trigger level. The energy consumption stage is composed of a resistor. The controllable reactor is composed of a controllable power supply and a saturation coil. According to the invention, the power surplus in the operation process can be effectively realized, the alternating current fault ride-through of the system can be realized, the overvoltage level of the direct current system can be reduced in the fault ride-through process, and the impact current of thedevice in the switching process can be reduced.

Description

technical field [0001] The invention belongs to the technical field of new energy and electric power engineering, and in particular relates to a power balance device and a control method for an offshore wind power direct transmission system. Background technique [0002] In recent years, with the continuous development of electric power technology, the capacity of offshore wind power generation has been expanding, especially the effective development and utilization of wind resources in remote sea areas. The development of large-capacity offshore wind farms is of great significance to solving the energy crisis. With the increasing energy problems, the development and utilization of new clean energy has become a hot issue in the world. Offshore wind power technology is about to usher in a full-scale explosion, and a large number of offshore wind power projects will start operating in the next few years. Grid-connected operation has become the most effective way to utilize wi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/36H02J3/38H02M1/32H02H9/04H02H9/02
CPCH02H9/021H02H9/045H02J3/36H02M1/32Y02E10/76Y02E60/60
Inventor 张军林卫星
Owner TBEA XIAN FLEXIBLE TRANSMISSION & DISTRIBUTIONCO
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