JPS5849096A - Wind power generator - Google Patents

Abstract

PURPOSE:To enable to operate a wind power generator at the constant rotating speed even under the worst conditions by connecting the prescribed resistor to the output of the generator in response to the rotating speed of the generator. CONSTITUTION:An AC generator 3 is driven by a wind mill 1 and a gear 2, and a current flowing through a field coil 6 is regulated by an automatic voltage regulator 9. On the other hand, the rotating speed detected by a pilot generator 10 is applied to a load regulator 11 in addition to the pitch control which is performed at the machine side in the rotating speed control, the contacts 14-l-14-n of a relay 14 are closed when the rotating speed becomes higher than the predetermined value, and a fixed resistor 15 is sequentially connected to the output of the generator 3. The resistance value of a variable resistor 13 is controlled in response to the deviation between the rotating speed signal and the reference signal. In this manner, wind power generation is performed safely and preferably.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a wind power generation device, and particularly relates to a wind power generation device suitable for application to a device having pitch control.

2. Description of the Related Art In recent years, so-called wind power generation devices, which rotate generators using wind power generated in windmill blades, have been attracting attention in recent years. In such a device, Hayashi,
Since the wind speed is not constant, the angle (C pitch) of the windmill blades is changed in order to rotate at a constant rotation speed. Such pitch control is also important in order to prevent unevenness in the power generation output.

By the way, in conventional wind power generators, since the rotation speed is controlled by pitch control, there are the following drawbacks.

1) Mechanical life issue 2) ! Non-operation during environmental deterioration (snow disaster) 3) Followability during changes in wind speed Figure 1 is a schematic diagram of a conventional wind power generator.

As shown in Figure 1, the wind turbine generator drives an alternating current generator 3 using a wind turbine 1 and a gear 2, and controls the generator voltage to a constant level using an automatic voltage regulator.On the other hand, the rotation speed is controlled at a pitch that changes the angle of the wind turbine blades. This is done by control, and power is supplied to the load 8 via the circuit breaker 7. The output of the generator 3 is adjusted by controlling the current flowing through the field winding 6 of the AC exciter 5 using an automatic voltage regulator 9 to obtain a constant voltage. Note that the output of the AC exciter 5 is supplied to the AC generator 3 via the rotary rectifier 4 .

In such a device, the relationship between wind speed and output is as follows: output P=1
/2PSV3.

However, P: Air density coefficient S Wind receiving area of two blades V: Speed If the pitch control device becomes inoperable during wind power generation operation (due to a failure, etc.), the output will be proportional to the cube of the wind speed. As shown in FIGS. 2(a) and 2(b), there is a tendency for the rotational speed to increase rapidly, leading to problems such as destruction of the wind turbine body. In addition, in pitch control, mechanical pitch control naturally has a control limit, and the range of rotational speed fluctuations (rapid changes in wind speed and direction) becomes large. Although there is a method in which pitch control is performed using a servo motor or the like, it is not suitable due to increased cost, longevity, and other problems.

In this way, in the past, control relied only on pitch control in order to control the rotational speed at a constant level, but due to failure of the pitch control device (mechanical failure),
When the pitch control device becomes inoperable due to environmental deterioration (snow damage) or when there is a sudden change in wind speed, the pitch control device cannot control the rotation speed to be constant.

An object of the present invention is to provide a wind power generator that backs up rotation speed control by pitch control and can operate at a constant rotation speed even under the worst conditions.

The present invention detects the rotation speed of the generator, connects a load resistor to the output side of the generator according to this rotation speed, and maintains the rotation speed at a constant (
In other words, the generator output voltage is kept constant.

FIG. 3 is a configuration diagram showing an embodiment of the present invention, and FIG. 4 (
a), (b), (C), and (d) are the output characteristics, rotation speed characteristics, resistance application time, and fine adjustment characteristics using a variable resistor of the present invention. In FIG. 3, the same members as those shown in FIG. 1 are given the same reference numerals.

The alternating current generator 3 is driven by the windmill 1 gear 2, and the electric current flowing through the field winding 6 of the alternating current exciter 5 is controlled by the automatic voltage regulator 9, thereby making the generator voltage constant.

On the other hand, the rotation speed control is performed separately from the pitch control performed on the machine side.The rotation speed is detected by the pilot generator 1o, and the load adjustment device 11 compares it with a preset value.If a feedback signal exceeding the set value is generated, a relay is activated. 14 contacts are made and the fixed resistors 14-1 to 14-n are sequentially turned on, and ON-OFF control is performed so that the rotation speed is operated within a certain range. The variable resistor is controlled by comparing the feedback signal from the pilot generator 10 with a reference signal, and rotating the sampling control device 12, which is built in the load adjustment device 11, to continuously control the resistance value of the variable resistor 13. conduct.

The reason for combining the fixed resistors 14-1 to 14-n with the variable resistor 13 is that when there is a sudden change in wind speed, the fixed resistor is used for control, and the variable resistor is used to perform fine adjustment to control the rotation speed. This is to keep it within a certain target value. , Q Through the above control, control characteristics as shown in FIGS. 4(a) to (d) can be obtained. Figure 4 (Connect a fixed resistor as shown in C'l,
Also, by adjusting the variable resistor as shown in Figure 4(d), the output characteristics will become as shown by the dotted line in Figure 4(a).
The rotation speed can be kept at a substantially constant value as shown in FIG. 4 (0)).

In this way, by using nine combinations of fixed resistance and continuous control, a safe and good wind power generation device can be provided without pitch control.

As is clear from the above, according to the present invention, it is possible to keep the rotation speed constant and perform safe and good wind power generation.

[Brief explanation of the drawing]

Figure 1 is a configuration diagram of a conventional wind power generator, Figure 2 (a),
Φ) is a conventional output characteristic and rotation speed characteristic diagram, FIG. 3 is a configuration diagram of an embodiment of the present invention, and FIG. 4(a), Φ). (C) and (d) are output characteristics, storage speed characteristics, and control characteristics diagrams in the present invention. / 1...windmill, 2...gear, 3...alternator, 4
...Rotating rectifier, 5...AC exciter, 6...Field winding, 7...Shield breaker, 8...Load, 9...Automatic voltage regulator, 10. ...Pilot generator, 11...
・Load adjustment device, 12...control motor, 13
...variable resistor.

Claims (1)

[Claims] 1. In a wind power generation device that uses the wind force received by the wind turbine to drive a generator while controlling the rotation speed to a constant speed using pitch control to obtain the required power generation output, the rotation speed of the generator is detected, and the rotation speed is adjusted to the detected rotation speed. A wind power generation device characterized in that a required resistor is connected to the output of the generator according to the need.