CN203368020U

CN203368020U - Brake device used for wind power generation current transformer system

Info

Publication number: CN203368020U
Application number: CN 201320451651
Authority: CN
Inventors: 尹进峰; 郭锐; 蒋中川; 刘炳
Original assignee: Beijing Etechwin Electric Co Ltd
Current assignee: Beijing Etechwin Electric Co Ltd
Priority date: 2013-07-26
Filing date: 2013-07-26
Publication date: 2013-12-25
Anticipated expiration: 2023-07-26

Abstract

The utility model discloses a brake device used for a wind power generation current transformer system. The brake device comprises a plurality of brake modules in parallel connection between a positive DC bus and a negative DC bus of the wind power generation current transformer system, and a controller for outputting the control signals based on the voltages of the positive DC bus and the negative DC bus to the plurality of brake modules, wherein each brake module comprises series connected resistors and a single-phase IGBT unit acting based on the control signal outputted by the controller.

Description

Brake apparatus for the wind-force generating converter system

Technical field

The utility model relates to wind generator system, more particularly, relates to a kind of brake apparatus for the wind-force generating converter DC bus.

Background technology

At present, in megawatt-stage direct-drive and dual feedback wind power generation system, generally adopt as Fig. 1, shown in Fig. 2, back-to-back pair of PWM current transformer is as electrical energy transformer, basic structure is the topological structure of handing over orthogonal (AC-DC-AC), the three-phase alternating current that wind-driven generator produces is rectified into direct current by pusher side unsteady flow module, stored energy is on DC bus, then carry out inversion by net side unsteady flow module, the three-phase electricity that becomes electrical network to receive the power conversion on DC bus, so just formed one by motor the power conversion ring to electrical network, realized the transfer of energy.

But; if net side unsteady flow module does not have in time the energy on DC bus to be delivered to electrical network; if and the energy injection that pusher side unsteady flow module constantly produces generator to the current transformer DC bus and/or line voltage promote and cause that energy is counter fills with to the current transformer DC bus; can cause DC bus-bar voltage constantly to raise; can serious threat arrive the safety of power device, thereby the protection of DC bus overvoltage is just seemed to particularly important in whole converter system.

Therefore, need need to the wind-force generating converter DC bus protected brake apparatus.

The utility model content

To be partly articulated in the following description the other aspect of the utility model and/or advantage, by describing, it can become clearer, or can understand by implementing the utility model.

According to one side of the present utility model, a kind of brake apparatus for the wind-force generating converter system is provided, this brake apparatus comprises: be connected in the positive direct-current bus of described wind-force generating converter system and a plurality of brake modules between negative DC bus in parallel; And, the control signal of the voltage based on described positive direct-current bus and described negative DC bus is exported to the controller of described a plurality of brake modules, wherein, each brake module in described a plurality of brake module comprises the single-phase IGBT unit that the resistor be connected in series and the control signal of exporting based on controller are moved.

Preferably, described controller comprises: the voltage detection unit that detects the voltage of positive direct-current bus and negative DC bus; Voltage by positive direct-current bus relatively and the voltage of negative DC bus are exported the control unit of control signal.

Preferably, described voltage detection unit comprises: the first voltage collector that gathers the voltage of positive direct-current bus; Gather the second voltage collector of the voltage of negative DC bus.

Preferably, described control signal is pulse signal, and described control signal is a road control signal or the multi-way control signals that outputs to respectively described a plurality of brake modules.

Preferably, described a plurality of brake module is arranged between wind-force generating converter pusher side unsteady flow module and grid side unsteady flow module.

As mentioned above; the brake apparatus proposed according to this practicality; adopt n brake module n(n >=2) design in parallel; and adopt centralized control unit that control signal one tunnel unified distribution or multichannel are distributed to respectively to each brake module; form the braking system module; complete excessive power on powerful DC bus and release, maintain the balance of DC bus, reach the protection power device and maintain the purpose that current transformer works.

The accompanying drawing explanation

By the description of embodiment being carried out below in conjunction with accompanying drawing, these and/or other aspect of the present utility model and advantage will become clear and be easier to and understand, wherein:

Fig. 1 is the block diagram according to the dual feedback wind power generation system of prior art;

Fig. 2 is the block diagram according to the directly-driving wind power generation system of prior art;

Fig. 3 is the block diagram according to the brake module for the wind-force generating converter system of an embodiment of the present utility model;

Fig. 4 is the block diagram according to the brake apparatus for the wind-force generating converter system of another exemplary embodiment of the present utility model.

Embodiment

Now the utility model embodiment is described in detail, in the accompanying drawings, wherein, identical label means same parts to its example shown all the time.Below with reference to the accompanying drawings embodiment is described to explain the utility model.

Fig. 3 is the block diagram that the wind-force generating converter system that comprises brake module 310 is shown.As shown in Figure 3, two ends are connected respectively to the positive direct-current bus of wind generator system and the brake module 310 of negative DC bus comprises a single-phase IGBT power cell 311 and braking resistor 312.

Electric voltage over press on DC bus; be that voltage is during higher than predetermined threshold voltage; the IGBT power cell 311 of brake module 310 is cut-off; braking resistor 312 is devoted oneself to work; consume energy too much on DC bus; maintain the balance of DC bus, reach the protection power device and maintain the purpose that current transformer works, this seems and is even more important when electrical network low voltage passes through.

Fig. 4 is the block diagram according to the brake apparatus for the wind-force generating converter system 400 of another exemplary embodiment of the present utility model.As shown in Figure 4, brake apparatus 400 comprises a plurality of brake modules 410 and controller 420.

Described a plurality of brake module 410 is connected in parallel between the positive direct-current bus and negative DC bus of described wind-force generating converter system, and the structure of each brake module 410 is similar to the brake module 310 shown in Fig. 3, therefore omit the structure of brake module 410 and the description of operation.

Controller 420 is exported to described a plurality of brake module 410 by the control signal of the voltage based on described positive direct-current bus and described negative DC bus, with disconnection and the closure of the IGBT unit 411 of controlling brake module 410.

Described controller 420 comprises that the voltage of the voltage detection unit 421 of the voltage that detects positive direct-current bus and negative DC bus and the voltage by positive direct-current bus relatively and negative DC bus exports the control unit 422 of control signal.

Voltage detection unit 421 comprises the first voltage collector 421a of the voltage that gathers the positive direct-current bus and gathers the second voltage collector 421b of the voltage of negative DC bus.

The first voltage collector 421a of voltage detection unit 421 and second voltage collector 421b gather respectively the voltage of positive direct-current bus of wind-force generating converter system and the voltage of negative DC bus, and the voltage of the positive direct-current bus of collection and negative DC bus is offered to control unit 422.

The positive direct-current bus that control unit 422 will receive respectively from the first voltage collector 421a and second voltage collector 421b and the voltage of negative DC bus compare, and according to comparative result, control signal is exported to described a plurality of brake module 410, i.e. the IGBT unit 411 of each brake module 410.

Here, control unit 422 determines whether the voltage difference of positive direct-current bus and negative DC bus surpasses predetermined threshold, and when described voltage difference surpasses predetermined threshold, by the output control signal, the IGBT unit 411 of each brake module 410 is performed an action by control signal, thereby make the braking resistor 412 of each brake module 410 consume electric energy too much on DC bus.

Here, control unit 422 is exported to described a plurality of brake module 410 by same control signal, and described control signal is preferably pulse signal.Here, described control signal is a road control signal or the multi-way control signals that outputs to respectively described a plurality of brake modules.

As mentioned above; the brake apparatus proposed according to this practicality; adopt n brake module n(n >=2) design in parallel; and adopt centralized control unit that control signal is distributed unitedly to each brake module; form the braking system module; complete excessive power on powerful DC bus and release, maintain the balance of DC bus, reach the protection power device and maintain the purpose that current transformer works.

Although meaned and described embodiment more of the present utility model, but those skilled in the art should understand that, in the situation that do not break away from principle of the present utility model and the spirit that is limited its scope by claim and equivalent thereof, can modify to these embodiment.

Claims

1. the brake apparatus for the wind-force generating converter system is characterized in that comprising:

Be connected in the positive direct-current bus of described wind-force generating converter system and a plurality of brake modules between negative DC bus in parallel;

The control signal of the voltage based on described positive direct-current bus and described negative DC bus is exported to the controller of described a plurality of brake modules,

Wherein, each brake module in described a plurality of brake module comprises the single-phase IGBT unit that the resistor be connected in series and the control signal of exporting based on controller are moved.

2. brake apparatus according to claim 1, wherein, described controller comprises:

Detect the voltage detection unit of the voltage of positive direct-current bus and negative DC bus;

Voltage by positive direct-current bus relatively and the voltage of negative DC bus are exported the control unit of control signal.

3. brake apparatus according to claim 2, wherein, voltage detection unit comprises:

Gather the first voltage collector of the voltage of positive direct-current bus;

Gather the second voltage collector of the voltage of negative DC bus.

4. brake apparatus according to claim 1, wherein, described control signal is pulse signal, described control signal is a road control signal or the multi-way control signals that outputs to respectively described a plurality of brake modules.

5. brake apparatus according to claim 1, wherein, described a plurality of brake modules are arranged between wind-force generating converter pusher side unsteady flow module and grid side unsteady flow module.