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Transient voltage coordinated control method and system

A technology of coordinated control and transient voltage, applied in the direction of AC network voltage adjustment, wind power generation, electrical components, etc., can solve problems such as overvoltage, and achieve the effect of ensuring safe and stable operation and avoiding inability to switch in time

Inactive Publication Date: 2017-12-22
CHINA ELECTRIC POWER RES INST +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, considering that the wind power is sent through the series compensation, the reactive power output by the series compensation will gradually increase as the voltage rises during the voltage recovery process. Over-voltage problems are prone to occur, causing wind turbines to be off-grid due to over-voltage protection

Method used

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  • Transient voltage coordinated control method and system
  • Transient voltage coordinated control method and system
  • Transient voltage coordinated control method and system

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specific Embodiment 1

[0050] The flow of a transient voltage coordinated control strategy proposed by the present invention is as follows: figure 1 and figure 2 As shown, the method includes the following steps:

[0051] I. When a grid failure is detected, the wind turbine and the dynamic reactive power compensation device switch control modes;

[0052] In step I, when the power grid fails, the wind turbine unit and the dynamic reactive power compensation device detect the occurrence of the fault, and send signals to the control device respectively to switch the control mode.

[0053] During the power grid fault, the wind turbine and the dynamic reactive power compensation device detect a voltage drop, and the wind turbine and the dynamic reactive power compensation device respectively send signals to the control device to switch the control mode. The unit is switched from the normal operation mode to the dynamic reactive power support control mode. The control device receives the signal from the ...

specific Embodiment 2

[0060] I. When a grid failure is detected, the wind turbine and the dynamic reactive power compensation device switch control modes:

[0061] During the power grid fault, the wind turbine and the dynamic reactive power compensation device detect a voltage drop, and the wind turbine and the dynamic reactive power compensation device respectively switch control modes. The wind turbine is switched from the normal operation mode to the dynamic reactive power support control mode, the dynamic reactive power compensation device is switched from the voltage tracking compensation mode to the maximum reactive power compensation mode, and the reactive current target value is set to the maximum reactive current output value. Wind turbines and dynamic reactive power compensation devices continuously generate capacitive reactive power to support the grid voltage during faults.

[0062] II. When the fault is detected and cleared, the wind turbine and the dynamic reactive power compensation ...

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Abstract

The invention provides a transient voltage coordinated control method and system. The method includes the following steps: when detecting that a grid fails, switching a wind turbine unit and a dynamic reactive power compensation device to a reactive power output mode; and when detecting that the fault is cleared, starting a transient voltage coordinated control mode of the wind turbine unit and the dynamic reactive power compensation device. According to the technical scheme provided by the invention, a fan and reactive power compensation dynamic voltage coordinated control technology taking grid voltage recovery into account is adopted, and thus, the safe and stable operation of a large-scale wind power base based on series compensation is ensured.

Description

technical field [0001] The invention relates to the field of transient voltage control, in particular to a transient voltage coordinated control method and system. Background technique [0002] With the rapid development of new energy, it has become a key energy source at present, but the uneven distribution of wind / light resources makes it imperative to send large-capacity, long-distance new energy. Wind power is connected to the high-voltage power grid in the form of large-scale centralized transmission, and large-scale wind power long-distance transmission will become the main form of wind power consumption, especially since several million-kilowatt wind power bases have been established. After the large-scale wind power base is boosted to a voltage level of 500kV, it is connected to the power grid through a 500kV AC transmission line. Since high-voltage AC lines transmit wind power over long distances, a large amount of reactive power loss will be generated. In order to ...

Claims

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Application Information

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IPC IPC(8): H02J3/18H02J3/16H02J3/38
CPCH02J3/16H02J3/1807H02J3/386Y02E10/76Y02E40/30
Inventor 刘超迟永宁李琰刘辉孙华东苗淼汤海雁魏林君田新首毕研秋张鹏飞
Owner CHINA ELECTRIC POWER RES INST