JP2002136192A - Wind power generator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem of extreme charging and discharging for a storage battery by suspending power generation of a wind power generator, under an atmosphere of strong wind. SOLUTION: A power converting circuit 5 for the PWM control is provided between the power generator 2 and the storage battery 6. The ratio of an input voltage Vin and an output voltage Vout of the power converting circuit 5 is set to a large value under strong wind conditions. When the input voltage Vin is lowered, the number of rotations of a wind mill 1 is lowered due to the control explained above. As a result, the number of rotations may be controlled without stoppage of the power generation.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a wind power generator for converting wind power into electric power.

[0002]

2. Description of the Related Art Wind power generators for converting wind power into electric power are:
It has attracted attention as a power generation device that does not emit pollution, and has been put into practical use. In particular, small wind power generators having a capacity of several kW class are used for garden lights, pumps, and the like. A conventional small wind power generator includes a windmill, an AC generator to which the windmill is coupled, a rectifier circuit connected to the AC generator, a storage battery connected to the rectifier circuit, and a load circuit connected to the storage battery. It consists of a wind turbine speed detector and a short circuit connected between the pair of output terminals of the generator. The short-circuit device short-circuits the pair of output terminals of the generator when the rotation speed detector detects the rotation speed equal to or higher than the reference value to electrically brake the generator.

[0003]

In a conventional wind turbine generator having a short-circuit device, when the windmill rotation speed becomes large due to a strong wind or the like, the short-circuit device prevents over-rotation, and breaks due to high-speed rotation. And noise can be prevented. However, when the output terminals of the generator are short-circuited by the short-circuit device, the generated power becomes zero, and the power cannot be generated. The short-circuit device is used for preventing overcharge of the storage battery in addition to preventing overspeed. When the storage battery is overcharged, the power generation is made zero by the short-circuit device, and when the overcharge is released, the short circuit by the short-circuit device is released. However, the life of the storage battery is shortened by the repetition of overcharging and release of the storage battery.

Accordingly, a first object of the present invention is to provide a wind power generator capable of maintaining power generation while suppressing the number of revolutions in a strong wind. A second object of the present invention is to provide a wind power generator capable of maintaining power generation while suppressing the number of revolutions in a strong wind and minimizing a change in charge / discharge current of a storage battery. .

[0005]

SUMMARY OF THE INVENTION In order to solve the above problems and achieve the above object, the present invention provides a wind turbine, an AC generator having a rotor rotated by the wind turbine, and an AC generator. A connected rectifier circuit, a power conversion circuit connected to the rectifier circuit, a storage battery or a capacitor connected to the power conversion circuit, a rotation detector for detecting a rotation speed of the windmill, A reference rotation speed setting device for setting a reference rotation speed, connected to the rotation detector, the reference rotation speed setting device, and the power conversion circuit, and the detected rotation speed obtained from the rotation detector is the reference rotation speed; A control circuit for controlling the power conversion circuit so as to increase the ratio (Vout / Vin) between the input voltage (Vin) and the output voltage (Vout) of the power conversion circuit when the rotation speed is exceeded. Related to equipment That.

[0006] A DC generator can be used as described in claims 2, 5, and 8. According to a third aspect of the present invention, in the first or second aspect of the present invention, the power conversion circuit further includes an input voltage detection circuit for detecting an input voltage (Vin), and the control circuit includes the generator. Generator output voltage determining means for determining the output voltage of the motor, first subtraction means for calculating a difference (ΔF) between the detected rotation speed and the reference rotation speed, and when the difference (ΔF) is equal to or less than zero, A coefficient generating means for transmitting a coefficient value of 1 and transmitting a coefficient of a value smaller than 1 when the difference (△ F) is larger than zero; and a determined output voltage obtained from the generator output voltage determining means. Multiplying means for multiplying a coefficient obtained from the coefficient generating means to form a corrected voltage command signal; and second subtraction for obtaining a difference (△ Vin) between an output of the multiplying means and an output of the input voltage detecting circuit. Means and the input voltage based on the output of the second subtraction means. It is preferably made the output of the detection circuit and a control signal forming circuit for forming a signal for controlling the power conversion circuit so as to be close to the correction voltage command signal. Claim 4
As shown in FIG. 2, a wind turbine, an AC generator having a rotor rotated by the wind turbine, a rectifier circuit connected to the AC generator, a power conversion circuit connected to the rectifier circuit, and A storage battery or a capacitor connected to a conversion circuit, an output voltage detection circuit for detecting a voltage of the storage battery or the capacitor, a reference voltage setting device for setting a reference voltage value of the storage battery or the capacitor, the output voltage detection circuit, When the output detection voltage value obtained from the output voltage detection circuit exceeds the reference voltage value, the input voltage (Vin) and the output of the power conversion circuit are connected to the reference voltage setting device and the power conversion circuit. Ratio to voltage (Vout) (Vout / Vi
and a control circuit that controls the power conversion circuit so as to increase n). According to a sixth aspect of the present invention, in the invention of the fourth or fifth aspect, further, a rotation speed detector for detecting a rotation speed of the wind turbine, and an input voltage detection circuit for detecting an input voltage Vin of the power conversion circuit. Wherein the control circuit comprises: generator output voltage determining means for determining an output voltage of the generator; and a difference (△) between an output voltage detection value obtained from the output voltage detection circuit and the reference voltage value. First subtraction means for determining F);
Coefficient generating means for transmitting 1 as a coefficient value when the difference (△ F) is equal to or less than zero, and sending a coefficient having a value smaller than 1 when the difference (△ F) is larger than zero; Multiplying means for multiplying the determined output voltage obtained from the voltage determining means by the coefficient obtained from the coefficient generating means to form a corrected voltage command signal; and an output of the multiplying means and an output of the input voltage detecting circuit. A second subtraction means for obtaining a difference (△ Vin); and a signal for controlling a power conversion circuit such that an output of the input voltage detection circuit is made closer to the correction voltage command signal based on an output of the second subtraction means. And a control signal forming circuit to be formed. According to a seventh aspect of the present invention, a windmill, an AC generator having a rotor rotated by the windmill, a rectifier circuit connected to the AC generator, and a power converter connected to the rectifier circuit. Circuit, a storage battery or a capacitor connected to the power conversion circuit,
A rotation detector for detecting a rotation speed of the wind turbine, an output voltage detection circuit for detecting a voltage of the storage battery or the capacitor, an input voltage detection circuit for detecting an input voltage (Vin) of the conversion circuit, and the wind turbine A reference rotation speed setting device for setting a reference rotation speed, a reference voltage setting device for setting a reference voltage value of the storage battery or the capacitor, the rotation detector, the output voltage detection circuit, and a reference rotation speed setting device. When the detected rotation speed obtained from the rotation detector exceeds the reference rotation speed and the detected voltage detection value obtained from the output voltage detection circuit is connected to the base voltage setting device and the power conversion circuit. Is higher than the reference voltage value, the input voltage (Vin) and the output voltage (Vou)
and a control circuit for controlling the power conversion circuit so as to increase the ratio (Vout / Vin) to the wind power generation device. Also, as shown in claim 9,
9. The generator according to claim 7, further comprising an input voltage detection circuit for detecting an input voltage (Vin) of the power conversion circuit, wherein the control circuit determines an output voltage of the generator. Determining means for obtaining a first difference signal indicating a difference (ΔF) between the detected rotation speed and the reference rotation speed;
And a first coefficient for transmitting a coefficient value of 1 when the first difference signal is less than zero, and for transmitting a coefficient of a value smaller than 1 when the first difference signal is greater than zero. Generating means; second subtracting means for obtaining a second difference signal indicating a difference (ΔV) between an input voltage detection value obtained from the input voltage detection circuit and the reference voltage value; A second coefficient generating means for transmitting a coefficient value of 1 when the signal is equal to or less than zero, and transmitting a coefficient of a value smaller than 1 when the second difference signal is larger than zero; When the first coefficient obtained from the means and the second coefficient obtained from the second coefficient generating means have different values, the smaller coefficient is selected and the first and second coefficients are the same. A coefficient selecting means for outputting one of the first and second coefficients when the value is a value; Multiplying means for multiplying the determined voltage obtained from the output voltage determining means by the coefficient obtained from the coefficient selecting means to form a correction voltage command signal; and an output of the multiplying means and an output of the input voltage detecting circuit. Difference (△
Vin), and a signal for controlling the power conversion circuit based on the output of the third subtraction means so that the output of the input voltage detection circuit approaches the correction voltage command signal. Desirably, the control signal forming circuit is provided. Further, as set forth in claim 10, the power conversion circuit includes a reactor connected in series to a DC line, a switch connected between a pair of DC lines on an output side of the reactor, and a switch connected to the switch. Preferably, at the output side, a diode is connected in series with the DC line.

[0007]

According to the present invention, the input voltage of the power conversion circuit, that is, the output voltage of the generator is reduced during a strong wind. This suppresses an increase in the rotation speed of the windmill and the generator. Since the power supplied from the generator to the storage battery and the load is maintained even in a strong wind, the power can be continuously supplied. In addition, the width of charge and discharge of the storage battery is reduced.

[0008]

Next, a wind turbine generator according to an embodiment of the present invention will be described with reference to FIGS.

[0009]

First Embodiment A wind power generator according to a first embodiment shown in FIG. 1 is connected to a wind turbine 1, an AC generator 2 having a rotor rotated by the wind turbine 1, and connected to the AC generator 2. Rectifier circuit 3, a smoothing capacitor 4, a power conversion circuit 5 connected to the smoothing capacitor 4, a storage battery 6 connected to the power conversion circuit 5, and a load 7 connected to the storage battery 6. A speed detector 8 for detecting the number of revolutions of the wind turbine 1, a speed detector, an input voltage detecting circuit 9 for detecting an input voltage of the power conversion circuit 5, that is, a voltage of the capacitor 4, and a control circuit 10. .

The power conversion circuit 5 is connected to the first and second DC power supply lines 11 and 12 connected to the smoothing capacitor 4, and has a ratio Vout between the input voltage Vin and the output voltage Vout.
/ Vin, for example, as shown in FIG. 2, a switch Q1 comprising a reactor L1 and a field effect transistor, and a backflow preventing diode D
Consists of one. Reactor L1 is the first DC power line 1
1 in series. The switch Q1 is connected to the first and second DC power supply lines 1 on the output side of the reactor L1.
It is connected between 1 and 12. The diode D1 is connected in series with the first DC power supply line 11 so as to connect the storage battery 6 in parallel with the switch Q1. Note that the diode D1 is connected to the second side on the output side of the switch Q1.
Can be connected to the DC power supply line 12. Also,
In this embodiment, the storage battery 6 also functions as a smoothing capacitor, but a smoothing capacitor can be connected to the storage battery 6.

The switch Q1 is turned on in response to a control signal supplied from the control circuit 10, that is, a gate-source voltage.
Turn off. The duty ratio of the switch Q1, that is, the duty ratio Don
The relationship between the input voltage Vin and the output voltage Vout is as follows (1)
It is as shown in the equation. Vout / Vin = 1 / (1-Don) (1)

The rotation number detector 8 detects the rotation number, that is, the rotation speed of the rotor of the wind turbine 1, ie, the generator 2, by a known method, and outputs a rotation number detection signal Fd. An input voltage detection circuit 9 detects an input voltage Vin of the power conversion circuit 5 and detects a voltage detection signal Vin.
Is output. Here, for ease of explanation, both the input voltage and the output voltage of the input voltage detection circuit 9 are indicated by Vin. This input voltage Vin corresponds to the output voltage of the generator 2.

The control circuit 10 is connected to the rotation speed detector 8, the voltage detection circuit 9, and the power conversion circuit 5, and controls when the detected rotation speed Fd obtained from the rotation speed detector 8 exceeds the reference rotation speed Fr. , The input voltage Vin and the output voltage Vou of the power conversion circuit 5
The power conversion circuit 5 is controlled so as to increase the ratio Vout / Vin with respect to t. More specifically, the control circuit 10
Is a reference rotation speed setting device 13 for setting a reference rotation speed Fr corresponding to the limit rotation speed of the wind turbine 1, and a rotation speed detector 8
The voltage determination table 14 as generator output voltage determination means for determining the output voltage of the generator 2 that can obtain the maximum power from the generator 2 at the detected rotational speed Fd detected at
A subtractor 15 as first subtraction means for obtaining a difference ΔF between the detected rotation speed Fd and the reference rotation speed Fr;
Is less than zero, 1 is sent out as the coefficient value, and the rotational speed difference Δ
A coefficient table 16 as coefficient generating means for transmitting a value smaller than 1 as a coefficient when F is larger than zero;
A multiplier 17 as multiplication means for multiplying the determined output voltage V1 obtained from the generator output voltage determination table 14 by the coefficient K obtained from the coefficient table 16 to form a corrected voltage command signal V2; The obtained input voltage command signal V2 and the detection voltage Vin obtained from the input voltage detection circuit 9
Subtractor 1 as a second subtraction means for finding a difference ΔVin
8 and a control signal forming a signal for controlling the power conversion circuit 5 so that the output Vin of the input voltage detection circuit 9 approaches the correction voltage command signal V2 based on the voltage difference ΔVin obtained from the second subtractor 18. It comprises a control arithmetic unit 19 and a pulse generator 20 as circuits. Note that the reference rotation speed setting device 13 can be provided outside the control circuit 10.

The voltage determination table 14 is composed of a memory, and stores the relationship between the rotation speed Fd and the generator output voltage V1 for obtaining the maximum power shown in FIG. The table 14 may store the voltage V1 for all the rotation speeds Fd, or may store the rotation speed Fd and the voltage V1 selected stepwise. When there is no data corresponding to the detected rotational speed Fd in the table 14, data of a rotational speed close to the detected rotational speed Fd is used. 4 is stored in the memory in place of the table 14, and the detected rotational speed Fd is stored in the memory.
Can be substituted into the arithmetic expression to determine the voltage V1.

The voltage V 1 indicates the output voltage of the generator 2 and the input voltage of the power conversion circuit 5 that can obtain the maximum power from the generator 2. The relationship between Fd and V1 in FIG. 4 is determined from the relationship between the generator output voltage V0 and the generator output power P0 in FIG. 3 obtained experimentally. 3 is 166 rpm, A2 is 237 rpm, and A3 is 330 rpm.
m and A4 represent the relationship between the output voltage V0 and the output power P0 at 425 rpm, and A5 represents the relationship at 590 rpm. When the relationship between the output voltage V0 at which the maximum power can be obtained at each rotation speed in FIG. 3 and the rotation speed Fd is obtained, the characteristics shown in FIG. 4 are obtained. Note that the same characteristics as those in FIG. 4 can be obtained experimentally similarly in another generator having a different capacity.

The voltage determination table 14 includes a rotational speed detector 8
Is used as an address signal, and a signal indicating the corresponding target voltage V1 is output. When the wind is not strong, the voltage V1 output from the table 14 becomes the target output voltage of the generator 2.

The first subtracter 15 subtracts the reference rotational speed Fr from the detected rotational speed Fd obtained from the rotational speed detector 8 to obtain Fd-Fr = ΔF. When ΔF is in the condition of ΔF ≦ 0, it indicates that it is not necessary to limit the rotation speed of the windmill 1, and when ΔF> 0, it indicates that it is necessary to limit the rotation speed of the windmill 1.

Coefficient table 16 as coefficient generating means
Consists of a memory, stores a coefficient K = 1 corresponding to ΔF ≦ 0, and stores a coefficient K smaller than 1 corresponding to ΔF> 0. When the output of the first subtracter 15 is ΔF> 0, a coefficient satisfying 0 <K <1 is selected. The value of K at this time is 1 / ΔF
It can be. Thus, when ΔF> 0, ΔF
Can be obtained which changes in inverse proportion to the value of.
The coefficient table 16 outputs a coefficient K corresponding to the value of ΔF using the value of ΔF as an address. Instead of storing data indicating the relationship between a large number of values of ΔF and a large number of coefficients K in a memory, an arithmetic expression indicating the relationship between ΔF and K is stored, and the value of ΔF is substituted into this arithmetic expression. To determine the coefficient K.

The multiplier 17 multiplies the voltage V1 output from the table 14 by the coefficient K output from the table 16 to obtain KV1 = V2, and outputs this. V2 is a voltage command signal that has been corrected for a strong wind.

The second subtracter 18 calculates Vin-V2 = ΔVin
Of the input voltage detection signal Vin and the voltage command signal V
Outputs a signal indicating the difference from 2.

The control calculator 19 which receives ΔVin as an input is composed of, for example, a well-known proportional integration circuit (PI circuit).
Is formed. In short, ΔV
A duty ratio signal Don corresponding to a signal obtained by smoothing in, that is, a duty command signal is obtained.

The pulse generator 20 as a switch control signal forming means forms a control signal Vg having a pulse having a width designated by the duty ratio signal Don and sends it to the gate of the switch Q1 of the power conversion circuit 5. This pulse generator 20 is shown in FIG.
And a comparator 20b as schematically shown in FIG.
Consisting of The saw wave generator 20a is, for example, 20 to 150 k.
A sawtooth voltage Vt is generated at a repetition frequency of Hz. The comparator 20b compares the sawtooth voltage Vt and the duty ratio signal Don by a known method and outputs a control signal Vg composed of a PWM pulse.

When the switch Q1 is turned on in response to the output pulse of the pulse generator 20, a current flows through a path composed of the capacitor 4 of FIG. 1, the reactor L1 of FIG. 2, and the switch Q1, and energy is accumulated in the reactor L2. Is done. When the switch Q1 is turned off, a current flows through a path including the capacitor 4, the reactor L1, the diode D1, the storage battery 6, and the load 7. The ratio between the input voltage Vin and the output voltage Vout of the power conversion circuit 5 is determined by the aforementioned equation (1). When the storage battery 6 and the load 7 are relatively large, even if the duty ratio Don is increased, the output voltage Vout is not so high and the input voltage Vin is relatively low. Since the input voltage Vin of the power conversion circuit 5 corresponds to the output voltage V0 of the generator 2, if the input voltage Vin is kept low during strong winds, the rotation speed of the generator 2 is also kept low.

This embodiment has the following effects. (1) When the windmill rotation speed Fd is lower than the reference rotation speed Fr, the input voltage Vin is controlled so that the generated power is maximized, and the windmill rotation speed Fd is reduced by the strong wind or the like.
When the above occurs, control for lowering the input voltage Vin occurs, the wind turbine speed Fd decreases, and the wind turbine speed Fd and the generator output voltage Vin are balanced at an appropriate value. As a result, the maximum rotation speed of the wind turbine 1 can be suppressed without reducing the generated power to zero. In short, the power supply from the generator 2 to the storage battery 6 and the load 7 can be maintained, and the rotation speed of the windmill 1 can be suppressed. (2) By using the tables 14 and 16,
Control for obtaining the maximum generated power in a non-strong wind and control for limiting the number of rotations in a strong wind can be easily achieved. (3) Since there is generated power even in a strong wind, extreme charging and discharging of the storage battery 6 can be prevented.

[0025]

Second Embodiment Next, a wind power generator according to a second embodiment shown in FIG. 5 will be described. However, in FIG. 5, substantially the same parts as those in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted.

The wind power generator shown in FIG. 5 is provided with a control circuit 10a having a reference voltage setting device 13a instead of the reference rotation speed setting device 13 shown in FIG.
And the output voltage detection value V is output by the first subtractor 15a.
A difference ΔV between out and the reference voltage Vr is obtained, and the difference ΔV is formed so as to be sent to the coefficient table 16a. The reference voltage setting device 13
Can be provided outside the control circuit 10a.

The reference voltage setter 13a outputs a reference voltage Vr indicating the overvoltage level of the storage battery 6. Output voltage detection circuit 30 detects the voltage of storage battery 6. Here, both the input voltage and the output voltage of the output voltage detection circuit 30 are set to Vout
Will be shown. The first subtracter 15a calculates the difference between the output voltage detection value Vout and the reference voltage Vr as Vout-Vr =
Output ΔV.

The coefficient table 16a comprising a memory has a Δ
When V ≦ 0, that is, when ΔV is zero or a negative value, a coefficient value 1 is stored. When ΔV> 0, that is, when ΔV is a positive value, a coefficient value smaller than 1 is stored. When ΔV> 0, the coefficient value K can be determined by, for example, 1 / ΔV. Since the output side of the multiplier 17 in FIG. 5 is formed in the same manner as in FIG. 1, the same control operation as in FIG. 1 occurs.

In the wind power generator shown in FIG. 5, the strong wind state is determined based on the detection of the voltage of the storage battery 6, and the rotation speed of the wind turbine 1 is suppressed. That is, when the output voltage of the generator 2 and the input voltage Vin of the power converter 5 increase in a strong wind state, the charging voltage of the storage battery 6 also increases. When the charging voltage is equal to or higher than the reference voltage Vr, that is, when Vout-Vr = .DELTA.V is zero or a positive value, a coefficient K smaller than 1 is output. As a result,
When the output voltage Vout is high, a voltage command signal V2 lower than the output voltage V1 of the table 14 is obtained from the multiplier 17. Thereby, in the wind power generator of FIG. 5, an operation of lowering the input output voltage of the power conversion circuit 5, that is, an operation of lowering the input voltage Vin at the time of strong wind or at the time of overcharging occurs, thereby suppressing an increase in the rotation speed of the wind turbine 1, and Overcharging of the storage battery 6 is prevented. Therefore, the same effects as those of the first embodiment can be obtained by the second embodiment.

[0030]

Third Embodiment Next, a wind power generator according to a third embodiment shown in FIG. 6 will be described. However, in FIG. 6, the substantially same parts as those in FIGS. 1 and 5 are denoted by the same reference numerals, and the description thereof will be omitted.

The wind power generator of FIG. 6 is different from the wind power generator of FIG. 1 in that the output voltage detection circuit 30 and the reference voltage setter 13 of FIG.
a, a subtractor 15a, and a coefficient table 16a are added, and this is equivalent to the provision of a new coefficient selecting means 31. The outputs of the voltage determination table 14 and the coefficient table 16 of the modified control circuit 10b of FIG. 6 are determined in the same manner as in the device of FIG. The output of the coefficient table 16a in FIG. 6 is determined in the same manner as in FIG. Here, the first and second coefficient tables 1
The outputs of 6, 16a are distinguished by K1 and K2.

The selecting means 31 outputs the first coefficient K obtained from the first coefficient table 16 as the first coefficient generating means.
1 and a second coefficient table 1 as a second coefficient generating means
When the second coefficient K2 obtained from 6a has a different value, the smaller coefficient is selected and sent to the multiplier 17 as the coefficient K, and the first and second coefficients K1 and K2 have the same value. In the case of, the same value is sent to the multiplier 17 as the coefficient K. Therefore, the voltage command value V2 obtained from the multiplier 17 is limited to be smaller than V1 when the rotation speed of the windmill 1 due to a strong wind is too high and when the storage battery 6 is overcharged. , The output voltage of the generator 2 is reduced, and the rotation speed of the wind turbine 1 is suppressed and the storage battery 6 is prevented from being overcharged. As a result, the same effects as in the first embodiment can be obtained in the third embodiment.

[0033]

Fourth Embodiment Next, a wind power generator according to a fourth embodiment shown in FIG. 7 will be described. However, in FIG. 7, substantially the same parts as those in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted.

The wind power generator shown in FIG. 7 is provided with a DC generator 2a instead of the AC generator 2, the rectifier circuit 3 and the smoothing capacitor 4 shown in FIG. . As shown in FIG. 7, even when the DC generator 2a is used, the same effect as in the first embodiment can be obtained.

[0035]

[Modifications] The present invention is not limited to the above embodiment, and for example, the following modifications are possible. (1) Also in the wind power generators of FIGS. 5 and 6, a DC generator 2a can be used instead of the AC generator 2 and the rectifier circuit 3 as in FIG. (2) The power conversion circuit 5 can be modified. (3) Part or all of the control circuits 10, 10a, and 10b can be constituted by digital circuits. (4) The pulse generator 20 can be constituted by a counter. In this case, the counter starts counting in response to one cycle of the clock pulse, and ends counting when the value indicates the duty ratio Don, and outputs a PWM pulse with the duty ratio Don. (5) The voltage V1 determined by the voltage determination table 14 may be a constant value. Further, the voltage V1 for obtaining the maximum power of the generator 2 can be determined by the wind speed or the generated power.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a wind turbine generator according to a first embodiment.

FIG. 2 is a circuit diagram illustrating a power conversion circuit and a pulse generator of FIG. 1 in detail.

FIG. 3 is a diagram illustrating a relationship between output voltage and generated power at first to fifth rotation speeds of the wind power generator.

FIG. 4 is a diagram showing a relationship between the number of rotations of a wind power generator and an output voltage at which a maximum power can be obtained.

FIG. 5 is a block diagram illustrating a wind turbine generator according to a second embodiment.

FIG. 6 is a block diagram illustrating a wind turbine generator according to a third embodiment.

FIG. 7 is a block diagram illustrating a wind turbine generator according to a fourth embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Windmill 2 Generator 3 Rectifier circuit 4 Capacitor 5 Power conversion circuit 6 Storage battery 7 Load 10 Control circuit

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Shinji Sato 3-6-1 Kitano, Niiza-shi, Saitama F-term in Sanken Electric Co., Ltd. (reference) 3H078 AA02 AA26 BB04 BB07 BB11 BB12 CC02 CC22 CC32 CC54 CC56 CC62 CC73 5H590 AA02 AB04 AB05 CA14 CC01 CC11 CD01 CD03 EA07 EA13 FA05 FA08 FB01 FC11 GA02 GA10 HA02 HA27 JB02 JB07 JB12

Claims (10)

[Claims] An AC generator having a rotor rotated by the wind turbine; a rectifier circuit connected to the AC generator; a power conversion circuit connected to the rectifier circuit; A storage battery or a capacitor connected to a conversion circuit, a rotation detector for detecting a rotation speed of the wind turbine, a reference rotation speed setting device for setting a reference rotation speed of the wind turbine, the rotation detector and the rotation detector When the detected rotation speed obtained from the rotation detector exceeds the reference rotation speed, the input voltage (Vin) and the output voltage (Vin) of the power conversion circuit are connected to a reference rotation speed setting device and the power conversion circuit. Vout) and the ratio (Vout
/ Vin), and a control circuit for controlling the power conversion circuit so as to increase the power supply voltage. 2. A wind turbine, a DC generator having a rotor rotated by the wind turbine, a power conversion circuit connected to the DC generator, a storage battery or a capacitor connected to the power conversion circuit, A rotation detector for detecting the rotation speed of the windmill, a reference rotation speed setting device for setting a reference rotation speed of the windmill, the rotation detector, the reference rotation speed setting device, and the power conversion circuit. And the ratio (Vout) between the input voltage (Vin) and the output voltage (Vout) of the power conversion circuit when the detected rotation speed obtained from the rotation detector exceeds the reference rotation speed.
/ Vin), and a control circuit for controlling the power conversion circuit so as to increase the power supply voltage. 3. An input voltage (V) of the power conversion circuit.
in), the control circuit comprises: generator output voltage determining means for determining an output voltage of the generator; and a difference (ΔF) between the detected rotation speed and the reference rotation speed. And a first subtraction means for calculating the difference (ΔF) is 1 when the difference (ΔF) is equal to or less than zero, and a coefficient having a value smaller than 1 is transmitted when the difference (ΔF) is greater than zero. Coefficient generating means for multiplying the determined output voltage obtained from the generator output voltage determining means by a coefficient obtained from the coefficient generating means to form a corrected voltage command signal; and an output of the multiplying means. Second subtraction means for calculating a difference (ΔVin) between the output of the input voltage detection circuit and the output of the input voltage detection circuit. The output of the input voltage detection circuit approaches the correction voltage command signal based on the output of the second subtraction means. To form a signal for controlling the power conversion circuit. 3. The wind power generator according to claim 1, comprising a control signal forming circuit. A wind turbine; an alternator having a rotor rotated by the wind turbine; a rectifier circuit connected to the alternator; a power conversion circuit connected to the rectifier circuit; A storage battery or a capacitor connected to a conversion circuit; an output voltage detection circuit for detecting a voltage of the storage battery or the capacitor; a reference voltage setting device for setting a reference voltage value of the storage battery or the capacitor; the output voltage detection circuit; When the output detection voltage value obtained from the output voltage detection circuit is connected to the reference voltage setting device and the power conversion circuit and exceeds the reference voltage value,
The input voltage (Vin) and the output voltage (Vou) of the power conversion circuit
and a control circuit for controlling the power conversion circuit so as to increase the ratio (Vout / Vin) to the wind power generation device. 5. A wind turbine, a DC generator having a rotor rotated by the wind turbine, a power conversion circuit connected to the DC generator, a storage battery or a capacitor connected to the power conversion circuit, An output voltage detection circuit that detects a voltage of the storage battery or the capacitor, a reference voltage setting device that sets a reference voltage value of the storage battery or the capacitor, the output voltage detection circuit, the reference voltage setting device, and the power conversion circuit. When the output detection voltage value obtained from the output voltage detection circuit exceeds the reference voltage value,
The input voltage (Vin) and the output voltage (Vou) of the power conversion circuit
and a control circuit for controlling the power conversion circuit so as to increase the ratio (Vout / Vin) to the wind power generation device. 6. The power generator further includes: a rotation speed detector for detecting a rotation speed of the wind turbine; and an input voltage detection circuit for detecting an input voltage Vin of the power conversion circuit. Generator output voltage determination means for determining an output voltage; first subtraction means for determining a difference (ΔF) between an output voltage detection value obtained from the output voltage detection circuit and the reference voltage value; Coefficient generating means for sending out 1 as a coefficient value when ΔF) is equal to or less than zero, and sending out a coefficient having a value smaller than 1 when the difference (ΔF) is larger than zero; and the generator output voltage determining means. Multiplying the determined output voltage obtained from the above by a coefficient obtained from the coefficient generating means to form a corrected voltage command signal; and a difference (△) between an output of the multiplying means and an output of the input voltage detection circuit. Vin), and a second subtraction means for obtaining the second subtraction. 6. A control signal forming circuit for forming a signal for controlling a power conversion circuit so that an output of the input voltage detecting circuit approaches the correction voltage command signal based on an output of a stage. A wind power generator as described. 7. A windmill, an AC generator having a rotor rotated by the windmill, a rectifier circuit connected to the AC generator, a power conversion circuit connected to the rectifier circuit, and the power A storage battery or a capacitor connected to the conversion circuit; a rotation detector for detecting the rotation speed of the windmill; an output voltage detection circuit for detecting a voltage of the storage battery or the capacitor; and an input voltage (Vin) of the conversion circuit An input voltage detection circuit for detecting a reference rotation speed of the wind turbine; a reference voltage setting device for setting a reference voltage value of the storage battery or the capacitor; the rotation detector; and Connected to an output voltage detection circuit, a reference rotation speed setting device, the base voltage setting device, and the power conversion circuit, when a detection rotation speed obtained from the rotation detector exceeds the reference rotation speed; The ratio (Vout / Vin) between the input voltage (Vin) and the output voltage (Vout) of the power conversion circuit is obtained both when the detected voltage detection value obtained from the output voltage detection circuit exceeds the reference voltage value. And a control circuit for controlling the power conversion circuit to increase the size of the wind power generator. 8. A wind turbine, a DC generator having a rotor rotated by the wind turbine, a power conversion circuit connected to the DC generator, a storage battery or a capacitor connected to the power conversion circuit, A rotation detector for detecting the rotation speed of the wind turbine, an output voltage detection circuit for detecting the voltage of the storage battery or the capacitor, an input voltage detection circuit for detecting an input voltage (Vin) of the conversion circuit, and the wind turbine A reference rotation speed setting device for setting a reference rotation speed of, a reference voltage setting device for setting a reference voltage value of the storage battery or the capacitor, the rotation detector, the output voltage detection circuit, and a reference rotation speed setting device. When the detected rotation speed obtained from the rotation detector exceeds the reference rotation speed and the detection obtained from the output voltage detection circuit is connected to the base voltage setting device and the power conversion circuit. The power conversion circuit increases the ratio (Vout / Vin) between the input voltage (Vin) and the output voltage (Vout) of the power conversion circuit both when the detected voltage value exceeds the reference voltage value. And a control circuit for controlling the wind power generator. 9. The power conversion circuit according to claim 1, further comprising:
in), the control circuit comprises: generator output voltage determining means for determining an output voltage of the generator; and a difference (ΔF) between the detected rotation speed and the reference rotation speed. And a first subtracting means for obtaining a first difference signal indicating the first difference signal. When the first difference signal is less than zero, 1 is sent out as a coefficient value, and when the first difference signal is larger than zero, 1 is subtracted. First coefficient generating means for transmitting a coefficient having a smaller value, and obtaining a second difference signal indicating a difference (ΔV) between the input voltage detection value obtained from the input voltage detection circuit and the reference voltage value. A second subtracting means for transmitting a coefficient value of 1 when the second difference signal is equal to or less than zero, and for sending a coefficient of a value smaller than 1 when the second difference signal is greater than zero; Coefficient generating means, and a first coefficient obtained from the first coefficient generating means and the second coefficient When the second coefficient obtained from the number generating means has a different value, the smaller coefficient is selected and the first and second coefficients are selected.
When the coefficient has the same value, the coefficient selecting means for outputting one of the first and second coefficients, and the determined voltage obtained from the generator output voltage determining means is obtained from the coefficient selecting means. Multiplying means for multiplying a coefficient to form a corrected voltage command signal; third subtracting means for obtaining a difference (△ Vin) between the output of the multiplying means and the output of the input voltage detecting circuit; and the third subtraction 8. A control signal forming circuit for forming a signal for controlling the power conversion circuit such that an output of the input voltage detection circuit is made closer to the correction voltage command signal based on an output of the means. 8. The wind power generator according to 8. 10. The power conversion circuit includes a reactor connected in series to a DC line, a switch connected between a pair of DC lines on the output side of the reactor, and a DC line connected on the output side of the switch. 10. A wind power generator according to claim 1, further comprising a diode connected in series to the wind power generator.