Wind power plant coordination control method and system capable of preventing large-scale wind power frequent ride-through

A control method and technology for wind farms, applied in wind power generation, AC network voltage regulation, electrical components, etc.

Active Publication Date: 2017-05-03
CHINA ELECTRIC POWER RES INST +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing low-voltage ride-through implementation scheme is mainly based on grid voltage drop, and adopts appropriate control and protection strategies to limit the overvoltage and over-current of the unit, and ensure that the speed of the unit is within a reasonable range. There is no effective consideration for the frequent low-voltage ride-through of wind farms.

Method used

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  • Wind power plant coordination control method and system capable of preventing large-scale wind power frequent ride-through
  • Wind power plant coordination control method and system capable of preventing large-scale wind power frequent ride-through
  • Wind power plant coordination control method and system capable of preventing large-scale wind power frequent ride-through

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Experimental program
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Effect test

Embodiment 1

[0090] Figure 5 Shown is an actual wind farm frequent low-voltage ride-through phenomenon recorded wave. It can be seen from the figure that when the grid voltage drops to 0.9p.u, the unit enters the low-voltage ride-through state, and sends out reactive power to support the grid voltage, and the voltage picks up. After the breakdown state, the grid voltage dropped again, which occurred 6 times in this period of time.

[0091] The technical solution realized by the present invention will be further described below in conjunction with a preferred implementation case.

[0092]The structure of the simulation example system is attached Figure 6 shown. The thermal power installed capacity of the system is 1800MVA, the load capacity is 1190MW, and the wind power installed capacity is about 400MW. The synchronous generator set model includes the excitation system, prime mover and speed control system model, the load adopts a constant power source model, and a 100Mvar reactive po...

Embodiment 2

[0095] Based on the same inventive concept, the present invention also provides a wind farm coordination and optimization control system for preventing frequent crossing of large-scale wind power, characterized in that the control system includes:

[0096] A judging module, used to judge the low voltage ride-through state based on the voltage amplitude and voltage change rate of the wind power grid-connected point;

[0097] Coordinated operation control module during faults: used for coordinated operation control during low voltage ride-through faults of wind power grid-connected systems;

[0098] Fault clearing and coordinated operation control module: used for coordinated operation control after the low voltage ride-through fault of the wind power grid-connected system is cleared;

[0099] Steady-state operation control module: used for the control of the wind power grid-connected system during steady-state operation.

[0100] Preferably, the judging module is also used for...

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Abstract

The invention relates to a wind power plant coordination control method and system capable of preventing large-scale wind power frequent ride-through. The control method comprises the following steps: I, carrying out low-voltage ride-through state judgment based on wind power grid-connected point voltage amplitude and voltage change ratio; II, carrying out coordinated operation control in the low-voltage ride-through failure period of a wind power grid-connected system; III, carrying out coordinated operation control after low-voltage ride-through failures of the wind power grid-connected system are cleaned; and IV, carrying out steady-state operation control for the wind power grid-connected system. The judging ability of a wind generation set for short-circuit faults is strengthened, the power output characteristics of the wind generation set in the low-voltage ride-through process are optimized, and the coordinated control behaviors for the wind generation set and dynamic reactive power compensation equipment are added, so that frequent low-voltage ride-through of a wind power plant can be effectively avoided.

Description

technical field [0001] The invention relates to the field of control technology in new energy power generation technology, in particular to a wind farm coordinated control method and system for preventing frequent crossing of large-scale wind power. Background technique [0002] With the rapid development of wind power, its proportion in the power system continues to rise, making the grid-connected performance of wind power more and more important to the security and stability of the power grid. In order to enhance the transient stability of the system and avoid large-scale wind power off-grid accidents, low-voltage ride-through has become a basic requirement for wind farm grid-connected operation: [0003] (1) When the voltage at the grid-connected point of the wind farm drops to 20% of the nominal voltage, the wind turbines in the wind farm shall ensure continuous operation for 625ms without going off-grid, and the voltage at the grid-connected point of the wind farm shall...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38H02J3/16H02J3/24
CPCH02J3/386H02J3/16H02J3/24Y02E10/76Y02E40/30
Inventor 汤海雁李琰迟永宁田新首刘超王真
Owner CHINA ELECTRIC POWER RES INST
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