Fault ride-through control method and system for flexible direct current sending-out system of new energy island

A fault ride-through and control method technology, applied in wind power generation, AC network circuits, electrical components, etc., can solve problems such as wind power loss, impact on wind power consumption, and difficulty in meeting precise power reduction control

Pending Publication Date: 2018-06-29
CHINA ELECTRIC POWER RES INST +3
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Problems solved by technology

For millisecond-level control wind turbines, it is difficult to respond to relevant control requirements in a timely manner when the island is connected to the flexible DC grid. Especially after the DC grid fails and some DC lines are cut off, it is necessary to quickly limit the wind power injected into the flexible DC system. The existing wind turbines Both power

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  • Fault ride-through control method and system for flexible direct current sending-out system of new energy island
  • Fault ride-through control method and system for flexible direct current sending-out system of new energy island
  • Fault ride-through control method and system for flexible direct current sending-out system of new energy island

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Embodiment Construction

[0062] In order to better understand the present invention, the content of the present invention will be further described below in conjunction with the accompanying drawings and examples.

[0063] Wind power is not connected to the main grid through AC collection, but is directly connected to the flexible DC grid through AC-DC conversion. This method does not require synchronous power support, which increases the flexibility of wind power grid connection, but there is also a gap between flexible DC MS-level control and wind power. Control coordination problems, when wind power cannot respond to power changes in a timely manner, it may lead to excess power injected into the DC grid and cause the entire converter station to be blocked and withdrawn. Installing energy-consuming devices on the AC-side bus of the flexible HVDC converter station to control the active power injected into the converter station will cause the loss of wind power during faults and affect wind power consu...

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Abstract

The invention discloses a fault ride-through control method and system for a flexible direct current sending-out system of a new energy island. The method comprises the following steps: when a flexible direct current power grid is faulty: a flexible direct current convertor station sends a control signal to energy storage equipment according to a detected fault type, and the energy storage equipment performs power control according to the control signal; when the fault of the flexible direct current power grid is cleared away: the flexible direct current convertor station sends an active control signal to a new energy power station according to a recovery condition of the flexible direct current power grid; the new energy power station controls generator tripping of a wind turbine generator according to the active control signal; the energy storage equipment controls sent active power according to an output of the faulty new energy power station and the conveying capacity of the flexible direct current power grid, so as to complete fault ride-through. The fault ride-through control method disclosed by the invention realizes quick control over the power; after the fault is restored,protection is turned on to cut off surplus wind power according to a refinement control requirement, so as to complete the ride-through.

Description

technical field [0001] The present invention relates to the technical field of new energy fault ride-through control for isolated island transmission, in particular to a fault ride-through control method and system for a new energy island flexible direct transmission system. Background technique [0002] The traditional long-distance transmission of large-scale wind power, regardless of the traditional LCC type DC or AC, requires strong synchronous power support at the sending end, and sometimes even needs to provide support at the receiving end. And with the transformation of the national energy strategy, the difficulty lies in the development of wind power and the development of traditional synchronous power. For millisecond-level control wind turbines, it is difficult to respond to relevant control requirements in a timely manner when the island is connected to the flexible DC grid. Especially after the DC grid fails and some DC lines are cut off, it is necessary to quick...

Claims

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Application Information

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IPC IPC(8): H02J3/38
CPCH02J3/386H02J3/388Y02E10/76
Inventor 李琰刘超迟永宁
Owner CHINA ELECTRIC POWER RES INST
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