Control method and device of high voltage ride through for wind power converter based on hysteresis control

A wind power converter, hysteresis control technology, applied in circuit devices, AC network voltage adjustment, wind power generation and other directions, can solve the problem of high voltage faults that cannot ride through, and achieve high voltage fault ride-through, simple control, and DC suppression. The effect of bus voltage swell

Inactive Publication Date: 2018-10-16
中国东方电气集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problem that conventional wind turbines cannot ride through high-voltage faults, the present invention proposes a high-voltage ride-through control method and device for full-power wind power converters based on hysteresis current control

Method used

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  • Control method and device of high voltage ride through for wind power converter based on hysteresis control
  • Control method and device of high voltage ride through for wind power converter based on hysteresis control
  • Control method and device of high voltage ride through for wind power converter based on hysteresis control

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Effect test

Embodiment 1

[0048] A wind power converter high voltage ride through control method based on hysteresis control, characterized in that:

[0049] Specific steps are as follows:

[0050] Measure the three-phase voltage of the power grid in real time, separate the positive and negative sequence voltages of the power grid, and calculate the per unit value of the positive sequence voltage of the power grid;

[0051] Compare the positive sequence voltage per unit value with the high voltage threshold of the power grid. The high voltage threshold of the power grid is determined according to relevant national standards and system design indicators. If it is lower than the high voltage threshold, the grid-connected reactive power of the full power converter comes from the main control unit of the unit. And update and record the given active current value at this time; if the positive sequence voltage per unit value is higher than the high voltage threshold, calculate the given reactive current valu...

Embodiment 2

[0058] A wind power converter high voltage ride through control method based on hysteresis control, characterized in that:

[0059] Specific steps are as follows:

[0060] Measure the three-phase voltage of the power grid in real time, separate the positive and negative sequence voltages of the power grid, and calculate the per unit value of the positive sequence voltage of the power grid;

[0061] Compare the positive sequence voltage per unit value with the high voltage threshold of the power grid. The high voltage threshold of the power grid is determined according to relevant national standards and system design indicators. If it is lower than the high voltage threshold, the grid-connected reactive power of the full power converter comes from the main control unit of the unit. And update and record the given active current value at this time; if the positive sequence voltage per unit value is higher than the high voltage threshold, calculate the given reactive current valu...

Embodiment 3

[0084] A wind power converter high-voltage ride-through device based on hysteresis current control, characterized in that it includes: a signal detection unit, a system control unit, a hysteresis control unit and a chopper control unit, the system control unit and the chopper control unit, The signal detection unit and the hysteresis current control unit are connected through hard wiring to transmit the believed control signal. The signal detection unit is connected with the chopper control unit, the hysteresis current control unit and the system control unit through hard wiring, and is used to transmit the collected signal to each control unit. The chopper control unit is connected with the DC bus chopper circuit through hard wiring.

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Abstract

The invention relates to the technical field of wind power converter control, in particular to a control method and a device of high voltage ride through for a full power wind power converter based onhysteresis current control. The method specifically comprises the following steps of: measuring a three-phase voltage of a grid in real time, performing positive and negative sequence separation on grid voltage, and calculating a per-unit value of positive-sequence grid voltage; and comparing the per-unit value of positive-sequence voltage with a high voltage threshold value of the grid, causinga grid-connected reactive power of a full power converter to come from an group main control unit if lower than the high voltage threshold value, and updating record of a given value of active currentvalue at this time. According to the invention, the grid voltage in real time is monitored, and whether the grid voltage is higher than the high voltage threshold of the grid is determined. When thegrid voltage is higher than the high voltage threshold of the grid, a given value of reactive current is calculated according to the grid voltage. The rise of the grid voltage is suppressed by absorbing a certain amount of reactive power from the grid, which is beneficial for the full power converter to operate without need to off-grid when the grid voltage rises, and to achieve high voltage faultride through successfully.

Description

technical field [0001] The invention relates to the technical field of wind power conversion control technology, in particular to a high voltage ride-through control method and device for a full-power wind power converter based on hysteresis current control. Background technique [0002] Wind energy is a clean and renewable resource. In recent years, wind power technology has developed rapidly, and the installed capacity of wind power may rise rapidly. Due to large-scale wind power grid integration and the increasing proportion of wind energy in the grid, wind turbines are required to have strong fault ride-through capabilities. Among them, high-voltage ride-through capability has been paid more and more attention, and many foreign countries have issued relevant standards and guidelines. The domestic corresponding high-voltage ride-through regulations for wind turbines have also been formulated. [0003] When the grid failure causes overvoltage at the grid-connected point ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/16H02J3/38
CPCH02J3/386H02J3/16H02J2203/20Y02E10/76Y02E40/30
Inventor 吴小田周宏林代同振
Owner 中国东方电气集团有限公司
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