Double-feed current transformer with reliable low-voltage ride-through capability

A technology of low-voltage ride-through and doubly-fed converters, which is applied in the directions of reactive power compensation, reactive power adjustment/elimination/compensation, and single-grid parallel feeding arrangement, which can solve the problems of large impact torque and poor reliability. To achieve the effect of improving service life, high reliability and avoiding impact

Inactive Publication Date: 2012-12-19
NANJING JUNENG ELECTRICAL CONTROL AUTOMATION EQUIP
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0011] The purpose of the present invention is to provide a novel doubly-fed wind turbine with perfect low-voltage ride-through capability in order to solve the problems of large imp

Method used

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  • Double-feed current transformer with reliable low-voltage ride-through capability
  • Double-feed current transformer with reliable low-voltage ride-through capability
  • Double-feed current transformer with reliable low-voltage ride-through capability

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Embodiment Construction

[0036] attached Figure 2~5 Non-restrictive disclosure of the specific structure of the embodiment of the present invention, the following in conjunction with the attached Figure 2~5 The present invention is further described.

[0037] Depend on figure 2 It can be seen that the double-fed converter includes the dynamic energy consumption unit DPC on the stator side, the grid-side converter GSC, the machine-side converter RSC, the DC unloading unit DBU, the grid-connected fast switch GK, and the transient reactive current compensation unit TSTATCOM (Transient STATCOM), AD / DC rectifier switch EK, grid-side filter LB and controller KZQ; there are also ports A, B and C, of ​​which:

[0038] The dynamic energy consumption unit DPC on the stator side, one end of the AC / DC rectifier switch EK, and one end of the grid-connected fast switch GK are directly connected to the stator of the double-fed generator through the A port; the AC end of the transient reactive current compensati...

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Abstract

The invention relates to a double-feed current transformer with perfect and reliable low-voltage ride-through capability, which consists of a rapid internetworking switch GK, a direct-current unloading unit DBU, a stator side dynamic power consuming unit DPC, a transient reactive current compensation unit TSTATCOM, an AC/DC (alternating-current/direct-current) rectification switch EK, a filter, a PWM (pulse-width modulation) rectification network side current transformer GSC, a rotor side inverter transformer RSC and a controller KZQ. The double-feed current transformer is provided with a port A, a port B and a port C, wherein the port A is connected with a stator of a double-feed wind-driven power generator, the port B is connected with a power grid, and the port C is connected with a rotor of the double-feed power generator; the stator side dynamic power consuming unit DPC is connected with the stator of the double-feed power generator through the port A, the direct-current unloading unit is connected with public direct-current buses of the GSC and the RSC, the transient reactive current compensation unit TSTATCOM is connected with the power grid side, the alternating-current end of the AC/DC rectification switch EK is connected with the stator of the double-feed power generator, and the direct-current end of the AC/DC rectification switch EK is connected with the public direct-current buses; and the working state of each part of the double-feed current transformer is controlled by signals transmitted by the controller KZQ.

Description

technical field [0001] The invention designs a doubly-fed wind power generating set converter device with perfect low-voltage ride-through function, which is suitable for doubly-fed wind power generating set. Background technique [0002] With the rapid development of wind power generation, the installed capacity of wind power is constantly increasing, and the proportion of wind power in the power generation capacity is also increasing. When the proportion of wind power installed capacity in the power system is relatively large, after a power system fault causes a voltage drop, the removal of the wind farm will seriously affect the stability of the system operation. Studies have shown that when wind turbines have low voltage ride through (Low Voltage Ride Through, LVRT) capabilities, the stability of the entire power system can be improved. Therefore, countries with a large proportion of wind power installed capacity in the world, such as Denmark, Germany, and the United St...

Claims

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Application Information

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IPC IPC(8): H02J3/38H02J3/18
CPCY02E40/30
Inventor 王中廖恩荣黄晓辉李志国辛志远
Owner NANJING JUNENG ELECTRICAL CONTROL AUTOMATION EQUIP
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