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Wind power grid voltage fault protection device and method applicable to wide power factor range

A grid voltage and power factor technology, applied in the direction of AC network voltage adjustment, power network operating system integration, information technology support system, etc., can solve the problems of poor machine terminal voltage compensation effect and high cost, so as to improve reliability and prolong service life Effects of improved life and compensation accuracy

Active Publication Date: 2016-08-24
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of high cost of the existing wind farm power grid voltage fault protection device and poor compensation effect on the machine terminal voltage when the power factor of the wind turbine is low, and to provide a wind farm power grid applicable to a wide range of power factors Voltage fault protection device and method

Method used

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  • Wind power grid voltage fault protection device and method applicable to wide power factor range
  • Wind power grid voltage fault protection device and method applicable to wide power factor range
  • Wind power grid voltage fault protection device and method applicable to wide power factor range

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specific Embodiment approach 1

[0047] Specific implementation mode one: the following combination figure 1Describe this embodiment, the wind farm power grid voltage fault protection device applicable to a wide power factor range described in this embodiment, the protection device is connected between the busbar at the high-voltage side of the wind farm fan step-up transformer and the busbar of the power grid, the protection The device has three single-phase structures, each single-phase structure is the same, and each single-phase structure includes a relay 1, a first power diode D1, a second power diode D2, a third power diode D3, a fourth power diode D4, and an insulated barrier double Pole type transistor T and resistor R,

[0048] The anode of the first power diode D1 is connected to the grid busbar, the cathode of the first power diode D1 is connected to the cathode of the second power diode D2, the anode of the second power diode D2 is connected to the terminal busbar, and the anode of the second powe...

specific Embodiment approach 2

[0052] Embodiment 2: In this embodiment, Embodiment 1 is further described, and the gate of the IGBT T is driven and controlled by PWM.

specific Embodiment approach 3

[0053] Specific implementation mode three: the following combination figure 1 and figure 2 Describe this embodiment, the wind farm grid voltage fault protection method applicable to a wide power factor range described in this embodiment, the protection method is implemented based on the wind farm grid voltage fault protection device applicable to a wide power factor range described in Embodiment 1 or 2 , the protection method includes the following steps:

[0054] Step 1: When the grid voltage is normal, collect the voltage value of the bus bus at the machine terminal and the value of the bus bus at the grid, and obtain the normal voltage amplitude of the bus bus at the machine terminal through fast Fourier transform|v WTG | * and the normal voltage amplitude of the busbar of the power grid|v PCC | * ;

[0055] Step 2: Collect the current value i of the busbar at the machine end WTG , The current voltage value of the machine-side confluence busbar v WTG and the current...

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Abstract

The invention provides a wind-power-plant network voltage fault protection device and method suitable for a wide power factor range, and belongs to the technical field of wind driven generator protection. The wind-power-plant network voltage fault protection device and method suitable for the wide power factor range solve the problems that an existing wind-power-plant network voltage fault protection device is high in cost, and a compensation effect on a generator terminal voltage is poor when a draught fan power factor is relatively low. The protection device is connected between a generator terminal bus bar and a power network bus bar on the high-voltage side of a boosting transformer of a draught fan of a wind power plant. The protection device comprises three single-phase structures, and the single-phase structures are identical and respectively comprise a relay, a first power diode D1, a second power diode D2, a third power diode D3, a fourth power diode D4, an insulated gate bipolar transistor T and a resistor R. When the method is used while a network voltage is normal, the resistors and power switching devices are bypassed through the relays, and therefore the problem that when a power network is normal, the power switching devices are still in an on state, so that loss is caused is solved. The wind-power-plant network voltage fault protection device and method are applied to wind-power-plant network voltage fault protection.

Description

technical field [0001] The invention relates to a wind power grid voltage fault protection device and method applicable to a wide power factor range, and belongs to the technical field of wind power generator protection. Background technique [0002] Double-fed wind turbines will cause problems such as rotor instantaneous overcurrent, overvoltage and DC bus voltage fluctuations when the grid voltage drops, and these problems will not only cause serious consequences for the generator and the converter connected to it. What's more serious is that the decoupling of the wind turbine may also cause a wider decoupling of the power grid system and even cause the power grid to be paralyzed. [0003] The existing power grid voltage fault protection device used for motor protection is a series resistance protection device, which adopts a cascade method and is composed of multi-level resistances connected in series, and the resistances of each level are respectively connected in parall...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/14
CPCY02B70/3225Y04S20/222
Inventor 郑雪梅王春李秋明李朋曹瀚楠丁丹枚
Owner HARBIN INST OF TECH
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