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Aerogenerator current transformer and control method thereof

A technology of wind power generator and control method, which is applied in the direction of wind power generation, single-network parallel feeding arrangement, etc., can solve the problems of increasing the work of designers and increasing the design cost of converters, etc., so as to save equipment and labor costs, and reduce components and the design cost, the effect of optimizing the topology

Active Publication Date: 2016-06-08
CSR ZHUZHOU ELECTRIC LOCOMOTIVE RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When designing the cabinet, it is necessary to consider the layout and selection of each switching device at the same time, which increases the work of the designer
At the same time, due to the use of large-capacity contactors and circuit breakers, the design cost of the entire converter is also increased

Method used

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  • Aerogenerator current transformer and control method thereof
  • Aerogenerator current transformer and control method thereof
  • Aerogenerator current transformer and control method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] as attached figure 2As shown, a specific embodiment of a wind power generator converter includes: a grid-connected contactor K1 and a converter 1 , and the converter 1 includes a grid-side converter 11 and a machine-side converter 13 . The grid-side converter 11 is connected to the grid-connected contactor K1, the machine-side converter 13 is connected to the generator 2, and the stator side (stator winding) of the generator 2 is connected to the grid-side converter 11 by sharing the grid-connected contactor K1 to the grid. The wind power generator converter also includes: a pre-charging circuit 3 , a grid-side reactor L1 and a generator-side reactor L2 . The pre-charging circuit 3 includes a pre-charging contactor K2 and a current limiting resistor R, and the converter 1 also includes a DC bus 12 . The incoming terminal of the grid-connected contactor K1 is connected to the grid, and the other end of the grid-connected contactor K1 is divided into two terminals, one...

Embodiment 2

[0038] As another specific embodiment of the present invention, as attached image 3 As shown, the wind power generator converter further includes a main control system 4, and the main control system 4 is respectively connected with the converter 1, the generator 2, the grid-connected contactor K1, and the pre-charging contactor K2. Before the start of the wind turbine, the grid voltage of the box transformer is sent to the first terminal of the grid contactor K1, and when the grid voltage is detected to be normal, the pre-charging contactor K2 is turned on to charge the DC bus 12 of the converter 1 , to complete the establishment of the intermediate voltage. The main control system 4 of the wind power generator controls the rotation of the generator 2 near the synchronous speed, and starts the grid-side converter 11 of the converter 1, so that the grid-side converter 11 works in the voltage open-loop mode and controls the grid voltage. Phase-locking, when the output voltage ...

Embodiment 3

[0040] A specific embodiment of a wind power generator converter control method, comprising the following steps:

[0041] S100: Before the start of the wind turbine, the grid voltage of the box transformer is transmitted to the first terminal of the grid contactor K1, and when the grid voltage is detected to be normal, the pre-charging contactor K2 is turned on, which is the DC bus of the converter 1 12 charging to complete the establishment of the intermediate voltage;

[0042] S101: The main control system 4 of the wind power generator controls the rotation of the generator 2 near the synchronous speed, and starts the grid-side converter 11 of the converter 1, so that the grid-side converter 11 works in a voltage open-loop mode and is connected to the power grid. The voltage is phase-locked; the voltage open-loop method is to control the amplitude and frequency of the inverter output voltage of the grid-side converter 11 through direct setting to meet the grid-connected requ...

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Abstract

The invention discloses an aerogenerator current transformer and a control method thereof. The aerogenerator current transformer comprises a grid-connected contactor, a precharge circuit, a current transformer, a network-side reactor and a machine-side reactor. The precharge circuit comprises a precharge contactor and a current-limiting resistor, and the current transformer comprises a network-side current transformer, a DC bus and a machine-side current transformer. The inlet wire end of the grid-connected contactor is connected with a power network, the other end of the grid-connected contactor is divided into two wiring ends, one wiring end is connected with the stator side of a generator, and the other wiring end is connected with the network-side current transformer through the network-side reactor. The network-side current transformer and the machine-side current transformer share the DC bus, and the machine-side current transformer is connected with the rotor side of the generator through the machine-side reactor. The precharge circuit draws power from the power network, passes through the precharge contactor and then is connected with the DC bus through the current-limiting resistor. According to the invention, through optimizing a blower fan whole-machine system main circuit topology structure, under the condition that the blower fan performance is not affected, switch devices are reduced, and the equipment cost and the labor cost are decreased.

Description

technical field [0001] The invention relates to the field of wind power generation, in particular to a topological structure of a wind power generator converter and a control method thereof. Background technique [0002] Energy is an important material basis for the existence and development of human society. With the continuous growth of economic globalization and population, the demand for energy is increasing day by day. The problem of energy shortage and the environmental problems brought about by the development and utilization of energy have also attracted more and more attention from all over the world. . Wind energy is a non-polluting renewable energy source, which is inexhaustible and widely distributed. With the requirement of human beings for the ecological environment and the need for energy, the development of wind energy has been paid more and more attention. At present, the total installed capacity of wind turbines in the world is increasing year by year, an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38
CPCY02E10/76
Inventor 胡佑群盛建科王新泽佘岳王强徐凤星黄敏张少云王继丽
Owner CSR ZHUZHOU ELECTRIC LOCOMOTIVE RES INST
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