JPS61231841A - Wind power source unit - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a wind power supply device that efficiently supplies electrical energy obtained by wind power generation to a load.

(Conventional technology) As a wind power supply device that supplies electrical energy obtained from wind power generation to a load, a DC generator is installed in the wind turbine, and the DC output of the DC generator is temporarily stored in a storage battery via a charger, and the DC output is stored as needed in a storage battery. Depending on the situation, some outputs are converted to AC output via a conversion circuit and supplied to the load. Since the output of wind power generation fluctuates due to wind fluctuations, this power is temporarily stored in a storage battery to ensure a stable supply of power to the load.

(Problems to be Solved by the Invention) By the way, electrical energy is supplied to a load via a charger, a storage battery, and a conversion circuit. Therefore, the system configuration for supplying AC output to the load is complex and costly, and furthermore, there are problems such as a low level of electrical energy supplied because there is a large loss on the way from the wind turbine to the load. .

This invention was made against this background, and it is possible to supply electrical energy obtained from a wind turbine to a load with a simple configuration and at low cost.

Furthermore, the aim is to reduce losses and further improve efficiency.

(Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention connects an induction machine to a wind turbine equipped with an output adjustment means that maintains the rotational speed substantially constant. In addition to supplying the output to the load, excess AC output is converted to DC output via a conversion circuit to charge a storage battery, and when the AC output of the induction machine is below a predetermined value, the DC output of the storage battery is converted to DC output through the conversion circuit. It is characterized in that it is converted into DC output through the DC output and supplied to the load.

(Function) In this invention, an AC output is obtained by an induction machine connected to a wind turbine.
This AC output is supplied directly to the load. At this time, if the AC output obtained by the induction machine exceeds a predetermined value and there is a surplus, the surplus AC output is converted to DC via the conversion circuit and charged to the storage battery. Then, when the output of the wind turbine decreases and the AC output of the induction machine becomes less than a predetermined value, the DC output of the storage battery is converted to AC via a conversion circuit and supplied to the load.

(Example) Hereinafter, an example of the present invention will be described in detail based on the accompanying drawings.

In the figure, reference numeral 1 denotes an induction machine, and this induction machine 1 is installed on a tower 4 of a wind turbine 3 via a bracket 2.

The input shaft 5 of the induction @ 1 is arranged vertically and is connected to the transmission rotation shaft 7 via a universal joint 6 . The transmission rotation shaft 7 is guided into a nacelle 8 that is rotatably provided in a horizontal plane, is converted into a horizontal direction by a bevel gear (not shown), and is connected to the wind receiver IO via a rotation shaft 9. This wind receiving part 10 has two blades 11.
and a rotor hub 12, which rotate as one.

As shown in FIG. 2, the rotor hub 12 is provided with a pitch control mechanism 13, which is an output adjustment means for maintaining the rotational speed of the blades 11 constant.

The pitch control mechanism 13 is composed of a rotating section 14 of the blade 11 disposed inside the rotor hub 12, and centrifugal movable sections 15 located on the left and right sides of the rotating section 14, which rotate the rotating section 14 according to load fluctuations.

The circular plate 16 of the rotating part 14 is fitted onto the shaft end 17 of the blade 11, and the blade 11 is rotatably provided on the rotor hub 12. A pair of levers 18 are provided protruding from the circular plate 16. Each end of the rod 19 is rotatably supported. these rods 19
The other end of the centrifugal movable section 15 is connected to a flyweight 20 that forms part of the centrifugal movable section 15 .

The flyweight 20 is provided within the rotor hub 12 so as to be able to reciprocate in the radial direction, and a permanent magnet 21 is fixed to the outside thereof. A support member 23 is fixed outside the rotor hub 12 to which a permanent magnet 22 having a polarity opposite to that of the permanent magnet 21 is fixed. A coil spring 24 is provided between the permanent magnet 21 and the permanent magnet 22, and the flyway) 2
0 is always biased inward.

When the rotation of the wind receiver 10 reaches a predetermined rotational speed, the flyweight 20 moves in the direction of the permanent magnet 22 against the spring 24 due to the centrifugal force. As a result, the rod 19 is pulled, the rotating part 14 is rotated, the pitch angle of the blade 11 is changed, the rotational speed is controlled, and one rotational speed is automatically kept constant.

And if the wind turbine operation area is exceeded due to strong winds, one permanent magnet 21
．． 22 fixes the pitch angle of the blade 11 by suction force, maintains the feathering state, releases wind, and lowers the rotation speed.

When the wind speed decreases, the spring force of the coil spring 24 automatically returns the permanent magnet 21 to its original position and the above-mentioned state is released.

The induction machine 1 is connected to a load 25 and is also connected to a storage battery 27 via a conversion circuit 26, so that the AC output of the induction machine 1 is supplied to the load 25, and the surplus AC output is transferred via the conversion circuit 26. It converts into direct current and charges the storage battery 27. When the AC output of the induction machine 1 is below a predetermined value, the DC output of the storage battery 27 is converted to AC via the conversion circuit 26 and supplied to the load 25.

As shown in FIG. 3, the conversion circuit 26 is composed of six diodes Du, Dv, Dw, Dx, Dy, and Dz, and six transistors Tu, Tv, Tw, Tx, Ty, and Tz. . When the load 25 is not driven or a surplus AC output is generated, the AC output of the induction 411 is a positive output to the diode Du-DW, and a positive output to the diode Dx-Dz.
Negative outputs are respectively taken out and rectified, and the storage battery 27 is charged.

On the other hand, when the power consumption of the load 25 is large or when the AC output of the induction machine I is small, a base current is applied to the transistors Tu, Tv, and Tw connected to the positive side of the storage battery 27 by an oscillator (not shown). For example, the transistor Tx connected to the negative side repeats opening and closing with a delay of 120' electrical angle.
, Ty, and Tz, but the transistor Tx is TU
, the transistor TV and the transistor Tz respectively delay the phase of Tv and Tw by 180° and apply base current to make them conductive, or cut them off to make them non-conductive. It is converted back to AC output.

The induction machine I is supplied with an excitation current generated by a conversion circuit 26, and is configured to obtain a three-phase AC output that matches the frequency and phase of the load 25.

Next, the operation of this embodiment will be explained.

In FIG. 4, a solid line N indicates the rotational speed of the blades 11 of the wind turbine, and a solid line PI indicates the output power of the induction machine l. In FIG. 5, a solid line P2 indicates the output of the induction machine l.

The blade 11 absorbs wind energy and starts rotating,
When the cut-in wind speed region V cin at point a is reached, an excitation current is supplied from the conversion circuit 26 to the induction all by a control device (not shown), and the induction machine 1 is operated as a generator, matching the frequency and phase of the load 25. Outputs alternating current.

If the blade ll rotates above the set rotation speed,
The pitch angle of the blade 11 is set to 11, and the blade 11 rotates in a direction parallel to the wind direction, and pitch control is performed to keep the rotation speed constant. This pitch control is performed in the range from the cut-in wind speed region Vcin at point a to the strong wind cut-out wind speed region Vca at point b.

As the wind speed increases, the AC output of the induction machine l increases, but since it is smaller than the power consumption of the load 25 from the cut-in wind speed region Vain at point a to the rated wind speed region Vn at point 0, the conversion circuit 26 is connected from the storage battery 27. The direct current is converted into alternating current through the converter, and the converted alternating current is supplied to the load 25.

The rated output is obtained between the rated wind speed area Vn at point 0 and the strong wind cutout wind speed area Vco at point b, and for wind speeds higher than the rated wind speed, pitch control releases more wind than necessary to keep the rotation speed constant. We are controlling the

From the rated wind speed region Vn at point 0 to the strong wind cutout wind speed region Vco at point b, only AC output is supplied from the induction machine l to the load 25. At this time, when the load 25 is not driven or when surplus power is output, it is rectified by the exchange circuit 26 and charged into the storage battery 27.

When there is sufficient wind power or when the wind speed exceeds the required output, that is, when the wind speed exceeds the strong wind cutout region Vca at point b, the centrifugal force acting on the pitch control mechanism 13 increases, causing the blades 11 to feather. The wind is released and the load 25 is cut off (point d).

Then, when the rotational speed of the blade 11 decreases, the centrifugal force acting on the pitch control mechanism 13 decreases, the feathering state is released, and the blade returns to point e. Blade 11
When the rotational speed decreases and reaches the zero point, it is connected to the load 25 again.

When AC power is output from this induction machine l, load 2
5 is not driven, or when surplus power is output, it is rectified by the exchange circuit 26 and converted to direct current, which is then sent to the storage battery 2.
Charge to 7. Also, from the AC power of the induction machine 1, the load 25
When the power consumption is large, the DC output output from the storage battery 27 is discharged, converted to AC via the conversion circuit 26, and supplied to the load 25.

When the wind speed decreases to below point a, the induction 4113 does not generate electricity, so the connection with the load 25 is cut off, and the DC discharge from the storage battery 27 is converted into AC by the conversion circuit 26 and supplied to the load 25. be done. This supply to the load 25 by discharging from the storage battery 27 is performed even when the wind turbine stops or the induction machine I stops.

Further, in this embodiment, an engine generator or a solar power generation device may be connected in parallel with the storage battery 27 shown in FIG. 3. In this case, there is an effect of preventing the storage battery 27 from discharging.

(Effects of the Invention) As described above, this invention uses a wind turbine to directly supply alternating current output to a load using an induction machine, convert excess alternating current output to direct current through a conversion circuit, and charge a storage battery. When the AC output of the storage battery is below a predetermined value, the DC output of the storage battery is converted to AC through a conversion circuit and then supplied to the load.This structure is simpler than the conventional one, and it also reduces fluctuations in the output of the wind turbine. Even if there is a problem, electrical energy can be efficiently supplied to the load via the switching circuit, and losses are reduced due to the low cost and simple configuration.

[Brief explanation of the drawing]

Fig. 1 is a front view showing a wind power supply device to which the present invention is applied, Fig. 2 is a sectional view of the rotor hub, Fig. 3 is a schematic circuit diagram of the wind power supply device of the present invention, and Fig. 4 is a diagram showing wind speed and rotation of the wind turbine. FIG. 5 is a diagram showing the relationship between the speed and the output of the induction machine, and is a characteristic diagram of the induction machine. 1...Induction m 3...Windmill ll...
Blade 12... Rotor hub 13... Pitch control mechanism 25... Load 26... Conversion circuit
29...Storage battery time Customer Yamaha Motor Co., Ltd. Figure 3 Figure 4 Bongeup

Claims (1)

[Claims] An induction machine is connected to a wind turbine equipped with an output adjustment means that maintains the rotational speed at a substantially constant rate, and the AC output of this induction machine is supplied to the load, and the excess AC output is converted to DC output via a conversion circuit. A wind power supply device that charges a storage battery, and when the AC output of the induction machine is below a predetermined value, converts the DC output of the storage battery into DC output via the conversion circuit, and supplies the DC output to the load.