CN202545118U

CN202545118U - Double-fed wind generation set

Info

Publication number: CN202545118U
Application number: CN201220119113XU
Authority: CN
Inventors: 冯煜尧; 郭强; 秦旷宇; 杨增辉
Original assignee: Shanghai Municipal Electric Power Co; East China Power Test and Research Institute Co Ltd
Current assignee: Shanghai Municipal Electric Power Co; East China Power Test and Research Institute Co Ltd
Priority date: 2012-03-27
Filing date: 2012-03-27
Publication date: 2012-11-21
Anticipated expiration: 2022-03-27

Abstract

The utility model provides a double-fed wind generation set which comprises a wind turbine, a gear box and a double-fed induction motor. The wind turbine, the gear box and the double-fed induction motor are connected in sequence. A stator of the double-fed induction motor is connected with a power grid directly. A rotor of the double-fed induction motor is connected to the power grid through two power inverters disposed back to back. Motor slip, active power and reactive power can be controlled in a large range with reactive power adjustment of a system by controlling rotor current, and stability of the wind generation set is improved.

Description

A kind of double-fed fan motor set

Technical field

The utility model relates to a kind of wind generating unit, belongs to wind power generation field.Be a kind of double-fed fan motor set specifically.

Background technique

Wind-power electricity generation, the kinetic energy of keeping watch exactly is transformed into mechanical kinetic energy, is converted into electric power kinetic energy to mechanical energy again.The principle of wind-power electricity generation is to utilize wind-force to drive the air vane rotation, sees through the speed lifting of booster engine with rotation again, impels generator for electricity generation.

The needed device of wind-power electricity generation is called wind power generating set.This wind power generating set can be divided wind wheel (comprising tail vane), generator and iron tower three parts substantially.Wind wheel is the vitals that the kinetic energy of keeping watch changes mechanical energy into, and it is made up of the impeller of two (or more) propeller shapes.When wind during, produce aerodynamic force on the blade and drive wind wheel and rotate to paddle.The material requirements intensity of blade is high, in light weight, how to make with glass fibre reinforced plastics or other composite material (like graphite fiber) at present.Because the rotating ratio of wind wheel is lower, and the size and Orientation of wind-force often changing, and this makes rotary speed unstabilization fixed again; So, before driving generator, also must add one and bring up to the speed-changing gear box of generator rated speed to rotating speed, add a speed regulating mechanism again the rotating speed maintenance is stablized, and then be connected on the generator.For keeping wind wheel to aim at wind direction all the time, also need to adorn the tail vane of a similar wind vane in the back of wind wheel to obtain maximum power.Iron tower is the framework of wind-wheel supporting, tail vane and generator.It generally builds than higher, in order that obtain bigger and uniform wind-force, enough intensity is arranged again.The effect of generator is the constant rotational speed that obtains by wind wheel, passes to power facility through raising speed and evenly turns round, thereby transform mechanical energy into electricity.

Asynchronous wind-powered electricity generation unit commonly used has advantage simple in structure, that control is convenient, cost is lower.But also there are some problems, are mainly reflected in:

1, the wattless power of unit is uncontrollable, needs idle in a large number during startup; When grid side broke down, because machine torque and electromagnetic torque imbalance will make the motor acceleration, this process also can absorb a large amount of idle.Receive in the light current net when this unit,, influence the stability of voltage, even can cause collapse of voltage if there are not reactive power compensators such as capacitor group or SVC.

2, the active power of unit output is uncontrollable, and its output fluctuation is bigger, and is therefore also apparent in view to the influence of electrical network.

3, when turbines vane generation stall, stalling characteristics are wayward, are difficult to the stable output of guaranteed output, and power output is decreased.

4, unit constant-speed operation, Wind Power Utilization efficient is lower.

The model utility content

The technical problem that the utility model will solve is: a kind of double-fed fan motor set, it can control the active power and the wattless power of unit, improves the stability of system.

In order to solve the problems of the technologies described above; The utility model adopts following technological scheme: a kind of double-fed fan motor set; Comprise the wind wheel, gear-box and the doubly fed induction generator that connect successively; Wherein, the stator of said doubly fed induction generator directly links to each other with electrical network, and the rotor of said doubly fed induction generator is connected in the electrical network through two back-to-back power changers.

At described double-fed fan motor set, be preferably, said double-fed fan motor set also comprises frequency variator, said frequency variator is connected between said doubly fed induction generator and the power changer.

The described double-fed fan motor set of the utility model; It comprises wind wheel, gear-box and the doubly fed induction generator that connects successively; The stator of said doubly fed induction generator directly links to each other with electrical network, and the rotor of said doubly fed induction generator is connected in the electrical network through two back-to-back power changers.This double-fed fan motor set can be in the slip of inner control motor, active power and wattless power on a large scale through the control rotor current, and the idle adjusting of participation system improves the stability of wind-powered electricity generation unit.

Description of drawings

Fig. 1 is the said double-fed fan motor set of a utility model structural representation.

Embodiment

Below, combine accompanying drawing that the utility model is made more detailed description with embodiment.Present embodiment only is the description to the utility model preferred forms, and the scope to the utility model does not have any restriction.

Embodiment

As shown in Figure 1; Said double-fed fan motor set; Comprise the wind wheel 1, gear-box 2 and the doubly fed induction generator 3 that connect successively; Wherein, the stator of said doubly fed induction generator 3 directly links to each other with electrical network, and the rotor of said doubly fed induction generator is connected in the electrical network 6 through two back-to-back power changers 4.

Preferably, said double-fed fan motor set also comprises frequency variator 5, and said frequency variator 5 is connected between said doubly fed induction generator 3 and the power changer 4.

Claims

1. double-fed fan motor set; Comprise the wind wheel, gear-box and the doubly fed induction generator that connect successively; It is characterized in that: the stator of said doubly fed induction generator directly links to each other with electrical network, and the rotor of said doubly fed induction generator is connected in the electrical network through two back-to-back power changers.

2. double-fed fan motor set according to claim 1 is characterized in that: said double-fed fan motor set also comprises frequency variator, and said frequency variator is connected between said doubly fed induction generator and the power changer.