Converter control method and device for wind power generating set

A technology of a wind turbine generator set and a control method, which is applied in the directions of wind energy generation, circuit devices, electrical components, etc., to achieve the effect of normal operation

Active Publication Date: 2017-04-05
XINJIANG GOLDWIND SCI & TECH CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although China does not currently have clear guidelines for high-voltage grid connection, it can be seen from the above examples that it is necessary for wind turbines to have high-voltage ride-through capabilities, which can reduce the scale of wind turbines disconnected from the grid in batches, avoid chain reactions and accident expansion, Therefore, the development of the future power grid will impose stricter requirements on the high voltage ride-through of wind turbines.

Method used

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  • Converter control method and device for wind power generating set
  • Converter control method and device for wind power generating set
  • Converter control method and device for wind power generating set

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] figure 1 The topological structure diagram of the main circuit of the wind power generation system based on the DC energy storage circuit provided by the embodiment of the present invention. like figure 1 As shown, the structure diagram includes a permanent magnet synchronous generator 1, a rectifier 2, a DC bus 3, a DC chopper circuit 4, an inverter 5, a filter 6, a step-up transformer 7, a wind farm grid 8 and a DC energy storage circuit 9 . The converter of the wind power generating set includes a DC energy storage circuit 9 and a DC chopper circuit 4 connected in parallel to the DC bus. In the above topology diagram, the DC Chopper circuit 4 is a subsystem used to consume excess energy. The existing DC chopper circuit of the permanent magnet direct drive wind turbine is a special device used to realize the low-voltage ride-through performance of the wind turbine, but it can also play an important role in the high-voltage ride-through operation of the wind turbine...

Embodiment 2

[0091] image 3 It is a flow chart of a method for controlling a converter of a wind power generating set according to Embodiment 2 of the present invention. In this embodiment, according to the measured three-phase voltage U abc Judging the operating state of the grid-connected point, determining which state the grid-connected point is in, the high-voltage operating state, the normal operating state, or the low-voltage operating state, and then performing corresponding converter control.

[0092] like image 3 As shown, the converter control method of the wind power generating set in this embodiment includes the following steps:

[0093] Step 100: Execute the first detection step to detect the measured three-phase voltage U on the grid side abc and the measured three-phase current I abc , The measured DC bus voltage U on the converter side dc , and according to the measured three-phase voltage U abc and the measured three-phase current I abc Calculate the measured acti...

Embodiment 3

[0100] Figure 4 It is one of the structural schematic diagrams of the wind power generating set converter control device according to the third embodiment of the present invention, Figure 5 is a schematic structural diagram of the inverter control module according to Embodiment 3 of the present invention, Image 6 It is the second structural diagram of the converter control device according to the third embodiment of the present invention, wherein, Image 6 The control device of this embodiment is described in more detail in the form of a mathematical control model, and the corresponding parts are denoted by the same reference numerals. like Figure 4 to Figure 6 As shown, the converter includes a DC energy storage circuit and a DC Chopper circuit connected in parallel on the DC bus, and the converter control device includes:

[0101] The first detection module 11 is used to detect the measured three-phase voltage U on the grid side abc and the measured three-phase curre...

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Abstract

The invention provides a converter control method and device of a wind generating set. The method includes the steps that the actually measured three-phase voltage and the actually measured three-phase current on the power grid side and the actually measured direct-current bus voltage of the converter side are detected, and the actually measured active power and the actually measured reactive power are calculated; the running state of the grid connection point is judged, and if the running state of the grid connection point is a high voltage running state, an inverter of a converter is controlled according to the actually measured three-phase voltage, the actually measured three-phase current, the actually measured direct-current bus voltage, the direct-current bus voltage given value and an reactive power control instruction; a direct-current Chopper circuit is controlled according to the actually measured direct-current bus voltage and the direct-current bus voltage given value; the actually measured charging current and the actually measured discharging current of an energy storage module are detected; charging and discharging control is performed on a direct-current energy storage circuit according to the actually measured direct-current bus voltage, the direct-current bus voltage given value and the actually measured charging current and the actually measured discharging current of the energy storage module. Through control over the converter of the wind generating set, the high voltage ride-through function of the wind generating set is achieved.

Description

technical field [0001] The invention relates to wind power generation technology, in particular to a method and device for controlling a converter of a wind power generating set. Background technique [0002] With the continuous expansion of wind power grid-connected scale and wind power generation capacity, the interaction between wind turbines and the power grid has become unnegligible. In case of power grid disturbance or failure, automatic disconnection will increase the difficulty of recovery control of local power grid faults, deteriorate the safety and stability of the power grid, and even aggravate faults, cause chain reactions and lead to system collapse. [0003] Among them, from the point of view of the voltage level at the grid-connected point, if the voltage of the grid-connected point is within 90% to 110% of the rated voltage, it is considered that the grid-connected point is in a normal operating state, and if it is higher than the normal range, it is conside...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): H02J3/38
CPCH02J3/28H02J3/386Y02E10/76
Inventor艾斯卡尔王海龙乔元黄远彦刘汉民马力王银明牛虎何红光任巍曦
OwnerXINJIANG GOLDWIND SCI & TECH CO LTD