JP2010074920A - Controller for wind power generation system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To efficiently take out effective electric power that a synchronous generator outputs without allowing the synchronous generator and a power converter to step out. <P>SOLUTION: The controller for a wind power generation system controls a power converter 3 the input terminal of which is connected to a synchronous generator 2 coupled to a wind mill 1, and the output terminal of which is connected to an electric system or to a load. The magnetic pole rotation angle of the synchronous generator 2 detected with a magnetic pole rotation angle detector 4 and the terminal voltage of the synchronous generator 2 detected by a voltage detector 9 are respectively inputted, and a terminal voltage command value of a phase corresponding to the magnetic pole rotation angle of the synchronous generator 2 is obtained so that the effective power of the synchronous generator 2 is equal to a pre-set effective power command value. The controller for the wind power generation system is equipped with a convertor controller 10 for controlling the input side voltage of the power converter 3 so that the terminal voltage of the synchronous generator 2 becomes the voltage command value. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a control device for a wind power generation system that converts power by a power conversion device and supplies power to an electric power system while synchronizing with an output of a synchronous generator using a windmill as a prime mover.

  In wind power generation using a windmill as a prime mover, wind energy changes depending on the wind conditions, so the rotation speed of the windmill also changes.

  Therefore, an induction machine that can be operated in conjunction with an electric power system is known as a power generator that uses a windmill as a driving force (Non-Patent Document 1).

  However, when an induction machine is used as a generator in a wind power generation system, the induction generator requires reactive power, and there are many unfavorable points for the system, such as an inrush current at start-up that leads to system oscillation. Therefore, there is a problem that the capacity of the power generation system connected to the system is limited.

Therefore, in a recent wind power generation system, a synchronous generator is used as another generator in place of the induction generator, and the output of this synchronous generator is converted into electric power by a power conversion device to supply power to the power system. (Non-patent document 2).
Issued in November 2001: New Energy and Industrial Technology Development Organization Wind Power Introduction Guidebook 5th Edition (see Figure 3.3-1 on page 30) Published in December 2003: IEEJ Transaction B, Vol. 123, No. 12, Sensorless output maximization control of variable speed wind power generation system using permanent magnet synchronous generator

  However, in a wind power generation system using a synchronous generator, when the output of the synchronous generator is converted into electric power by the power converter and is supplied to the power system, the power converter must be operated in synchronization with the synchronous generator. There is a problem that it becomes impossible to drive out of step.

  The present invention has been made in order to solve the above-described problems, and it is possible to efficiently extract effective power that can be output from the synchronous generator without stepping out of the synchronous generator and the power converter. An object of the present invention is to provide a control device for a power generation system.

  In order to achieve the above object, the present invention constitutes a control device for a wind power generation system by the following means.

(1) In a control device of a wind power generation system that controls a power converter in which an input end is connected to a synchronous generator coupled to a wind turbine and an output end is connected to a power system or a load, it is detected by a magnetic pole rotation angle detector. The synchronous generator's magnetic pole rotation angle and the terminal voltage of the synchronous generator detected by the voltage detector are respectively input so that the active power of the synchronous generator becomes equal to a preset active power command value. A converter that obtains a terminal voltage command value having a phase corresponding to the magnetic pole rotation angle of the synchronous generator and controls the input side voltage of the power converter so that the terminal voltage of the synchronous generator becomes the voltage command value. A control device is provided.

(2) In a control device for a wind power generation system in which an input end is connected to a synchronous generator coupled to a wind turbine and an output end is connected to a power system or a load, the terminal voltage of the synchronous generator is controlled. And a phase estimating means for obtaining an internal induced voltage phase estimated value of the synchronous generator by inputting a current or a current command value of the synchronous generator, and an active power command value in which the active power of the synchronous generator is preset. Power control means for outputting a current command value that is equal to the active power to be equal, phase estimation value of the internal induction voltage of the synchronous generator estimated by the phase estimation means and the internal induction voltage phase from the current of the synchronous generator Current detection means for detecting a current in phase with the estimated value; and the current output from the current detection means so that the current is equal to the current command value for active power output from the power control means. Comprising a transducer controller comprising a voltage control means for calculating a voltage command value for controlling the input voltage of the converter.

(3) Detected by a magnetic pole rotation angle detector in a control device of a wind power generation system that controls a power converter in which an input end is connected to a synchronous generator coupled to a windmill and an output end is connected to a power system or a load. The synchronous generator in which the magnetic pole rotation angle of the synchronous generator and the current of the synchronous generator detected by the current detector are input, and the effective current of the synchronous generator becomes equal to the effective current command value A converter control device for determining a terminal voltage command value of a phase according to the magnetic pole rotation angle of the power generator, and controlling an input side voltage of the power converter so that a terminal voltage of the synchronous generator becomes the terminal voltage command value; A current command value control unit that provides the converter controller with the allowable maximum effective current obtained from the rotational speed of the synchronous generator and the lower value of the rated current of the power converter as an effective current command value;

  ADVANTAGE OF THE INVENTION According to this invention, the effective electric power which a synchronous generator can output can be taken out efficiently, without a synchronous generator and a power converter device stepping out.

  Embodiments of the present invention will be described below with reference to the drawings.

(First embodiment)
FIG. 1 is a block diagram showing a first embodiment of a control device for a wind power generation system according to the present invention.

  In FIG. 1, 1 is a wind turbine, 2 is a synchronous generator directly connected to the wind turbine 1, 3 is a converter having an input end connected to the synchronous generator 2, and an output end of the converter 3 is connected to a DC capacitor 4. The output terminal of the inverter 5 is connected to the power system 6. Here, each of the converter and the inverter is configured by connecting a semiconductor switching element to an arm corresponding to each of the three phases.

On the other hand, reference numeral 10 denotes a converter control device that controls the converter 3. The converter control device 10 includes a magnetic pole rotation angle θ _R detected by a magnetic pole rotation angle detector 7 provided in the synchronous generator 2, and the synchronous generator 2. Current i _G and terminal voltage v _G detected by a current detector 8 and a voltage detector 9 provided on the output side, and an active power command value P _G ^* set in advance externally are input respectively. A gate pulse signal g _C to be controlled is given to the converter 3.

An inverter control device 12 controls the inverter 5. The inverter control device 12 includes the voltage V _{DC of} the DC capacitor 4 detected by the voltage detector 11 provided on the input side of the inverter 5, and the inverter 5. The inverter output current i _I and output voltage v _I detected by the current detector 13 and the voltage detector 14 provided on the output side are input, respectively, and a gate pulse signal g _I for controlling the inverter 5 is given to the inverter 5. Is.

  FIG. 2 is a block diagram illustrating a specific configuration example of the converter control device 10.

2, 10-1 generator active power calculation for calculating the generator active power P _G from the output current i _G and the terminal voltage v _G of the synchronous generator 2 is input from the current detector 8 and the voltage detector 9 parts, 10-2 generator effective power computing unit 10-1 obtained generator active power P _G active power command value P _G ^* becomes equal manner proportional integral calculation to the active power current command value (hereinafter This is a power control unit that outputs I _d ^{* (} referred to as a d-axis current command value).

10-3 is a current in phase with the generator internal induced voltage from the magnetic pole rotation angle θ _R of the synchronous generator 1 detected by the magnetic pole rotation angle detector 7 and the current i _G detected by the current detector 8 (hereinafter referred to as the generator internal induced voltage). a current detection unit for detecting a current advanced by 90 degrees (hereinafter referred to as a q-axis current) and a current detection unit for detecting the d-axis current detected by the current detection unit 10-3. 2 is a d-axis current control unit that outputs a d-axis voltage command value V _d ^* by performing a proportional-integral calculation so as to be equal to the d-axis current command value I _d ^* output from 2. A current detector 10-3 The q-axis current control unit outputs a q-axis voltage command value V _q ^* by performing a proportional-integral calculation so that the q-axis current detected in step S becomes zero.

Further, 10-6 represents the magnetic pole rotation angle θ _R of the synchronous generator 1 detected by the magnetic pole rotation angle detector 7, the d-axis voltage command value V _d ^* output from the d-axis current control unit 10-4, and the q axis. An arithmetic unit 10-7 for obtaining the output voltage command value v _C ^* of the converter 3 from the q-axis voltage command value V _q ^* output from the current control unit 10-5 is an output obtained by the arithmetic unit 10-6. This is a gate pulse generation circuit that outputs a gate pulse g _C for controlling the converter 3 based on the voltage command value v _C ^* .

On the other hand, the inverter control device 12 controls the inverter 5 so that the DC voltage _VDC becomes constant and converts direct current to alternating current as is generally done. Omitted.

  Next, the operation of the control device of the wind power generation system configured as described above will be described.

When the wind turbine 1 is rotated by wind energy, the internal induced voltage v _E is generated in the synchronous generator 2 in accordance with the rotational speed. At this time, the converter control device 10 inputs the input voltage of the converter 3 so that the terminal voltage v _G of the synchronous generator 2 and the output current i _G of the synchronous generator 2 become desired values based on the active power command value P _G ^*. v _C , that is, the terminal voltage v _G of the synchronous generator 2 is controlled.

  Here, the operation of the converter control device 10 will be described in detail with reference to FIG.

When the terminal voltage v _G of the synchronous generator 2 and the output current i _G of the synchronous generator 2 are input to the generator active power calculator 10-1, the generator active power calculator 10-1 generates the generator active power. to calculate the P _G. As an example, from the three-phase voltages v _GR , v _GS , v _GT and the three-phase currents i _GR , i _GS , i _GT ,
P _G = v _GR × i _GR + v _GS × i _GS + v _GT × i _GT
It can be determined _{P G} as.

When the generator active power P _G is input to the power control unit 10-2, proportional integral and calculated as the generator active power P _G in the power control unit 10-2 is equal to the active power command value P _G ^* Then, the d-axis current command value I _d ^* is obtained and given to the d-axis current control unit 10-4.

On the other hand, the current detector 10-3 detects the d-axis current I _d and the q-axis current I _{q in} phase with the magnetic pole rotation angle θ _R from the magnetic pole rotation angle θ _R and the output current i _{G of} the synchronous generator 2. The d-axis current I _d is supplied to the d-axis current control unit 10-4.

In this d-axis current control unit 10-4, proportional-integral calculation is performed so that the d-axis current I _d becomes equal to the d-axis current command value I _d ^*, and the d-axis voltage command value V _d ^* is calculated by the calculation unit 10-6. Output to. Further, when the q-axis current I _q detected by the current detection unit 10-3 is input to the q-axis current control unit 10-5, the q-axis current I _q is set to 0 in the q-axis current control unit 10-5. The proportional-integral calculation is performed to obtain the q-axis voltage command value V _q ^* , which is given to the calculation unit 10-6.

The arithmetic unit 10-6 obtains the output voltage command value v _C ^* of the converter 3 from the magnetic pole rotation angle θ _R , the d-axis voltage command value V _d ^*, and the q-axis voltage command value V _q ^*, and generates a gate pulse. Output to the circuit 10-7. As an example, the calculation of a three-phase voltage command value is shown in the following equation.

v _CR ^* = (V _d ^{* 2} + V _q ^{* 2} ) ^0.5 cos {θ _R + tan ⁻¹ (V _q ^* / V _d ^* )}
v _CS ^* = (V _d ^{* 2} + V _q ^{* 2} ) ^0.5 cos {θ _R + tan ⁻¹ (V _q ^* / V _d ^* ) − 2π / 3}
v _CT ^* = (V _d ^{* 2} + V _q ^{* 2} ) ^0.5 cos {θ _R + tan ⁻¹ (V _q ^* / V _d ^* ) − 4π / 3}
The magnetic pole rotation angle θ _R changes at an angular speed ω _G corresponding to the rotational speed of the generator rotor, but the output voltage command value v _C ^* also becomes a value corresponding to θ _R , so that the angular speed ω _{G is} an alternating current. That is, the converter 3 operates in synchronization with the generator.

Gate pulse generation circuit 10-7 outputs gate pulse g _C corresponding to output voltage command value v _C ^* to the gate of the semiconductor switching element of converter 3. A typical circuit of the gate pulse generation circuit is a triangular wave comparison PWM circuit, but is not limited to this circuit.

Thus configured control system, the control deviation of the controller is such that the zero, and controls the converter 3, generator active power P _G is the active power command value P _G ^* values of the street.

When the converter 3 is controlled in this way and the DC current I _C flows out of the converter 3 in accordance with the generator active power P _G determined by the terminal voltage v _G and the output current i _G of the synchronous generator 2, a capacitor is generated by this DC current. 4 is charged and the voltage V _{DC of the} capacitor 4 rises, but the inverter control device 12 makes the input current I _I of the inverter 5 a value that suppresses the rise of the voltage V _DC of the capacitor 4, that is, the DC voltage V _DC becomes constant. Thus, the output current i _I and the output voltage v _I of the inverter 5 are controlled.

As understood from the above configuration and action, according to the first embodiment of the present invention, the output voltage command value v _C ^* is of the converter 3, the phase of voltage determined from the synchronous pole rotation angle of the generator 2 theta _R It becomes a command value, and the synchronous generator 2 and the converter 3 can be operated in synchronization with stability. That is, even if the rotational speed of the synchronous generator changes, the converter 3 operates synchronously with the synchronous generator 2. Of course, since a synchronous generator is used, there is no undesirable influence on the system, such as the need for reactive power as in the case of an induction generator, and the occurrence of an inrush current at startup.

In the above example, to determine the generator active power P _G from voltage and current of the generator, as another example, when the loss of the converter 3 is small, also be approximated by the DC side power of the converter 3 it can. That is, P _G = V _DC × I _C
As another example in the same manner, the three-phase voltage _v IR inverter AC _side, v _{IS, v IT} and three-phase currents _{i IR, i IS,} from _{i IT,} it is possible to determine the _{P G} as the active power of the inverter output.

P _G = v _IR × i _IR + v _IS × i _IS + v _IT × i _IT
As described above, in this embodiment, regardless of the method of obtaining the generator active power P _G, its action and effects are the same. In the example of FIG. 2, with d-axis current control unit 10-4 and the q-axis current control unit 10-5, but the generator current is controlled to the magnetic pole rotation angle theta _R in phase with the current, the current amplitude control parts and current similar action and effect to control the generator current to the magnetic pole rotation angle theta _R in phase with the current in the phase control unit is of course obtained.

(Second Embodiment)
FIG. 3 is a block diagram showing a second embodiment of the control device for a wind power generation system according to the present invention. The same parts as those in FIG. 1 are denoted by the same reference numerals and the description thereof is omitted, and different parts will be described here.

In the first embodiment shown in FIG. 1, the magnetic pole rotation angle θ _R is detected by the magnetic pole rotation angle detector 7 provided in the synchronous generator 2 and is input to the converter control device 10. In the second embodiment, 3, the output current i _G and the terminal voltage v _{G of} the synchronous generator 2 detected by the current detector 8 and the voltage detector 9 in the converter control device 10 without using the magnetic pole rotation angle detector, as shown in FIG. As a configuration for inputting an active power command value P _G ^* preset in advance, the converter control device 10 is provided with a function for obtaining an estimated value of the internal induced voltage of the synchronous generator 2.

  FIG. 4 is a block diagram showing a specific configuration example of the converter control device 10. The same parts as those in FIG. 2 are denoted by the same reference numerals, the description thereof is omitted, and different parts are described here.

As shown in FIG. 4, a phase estimation unit 10-8 that inputs the terminal voltage v _G of the synchronous generator 2 and the d-axis current command value I _d ^* to obtain the internal induced voltage phase estimated value θ _E ′ of the synchronous generator 2. interior is provided, giving the internal induced voltage phase estimate theta _{E 'obtained} by the phase estimating unit 10-8 in the current detection unit 10-3, also, in place of the magnetic pole rotation angle theta _R to the arithmetic unit 10-6 The configuration is the same as that of FIG. 2 except that the induced voltage phase estimation value θ _E ′ is given.

  Here, a specific configuration of the phase estimation unit 10-8 will be described with reference to FIG.

In FIG. 5, 10-8a is a generator terminal voltage phase detector for obtaining the phase θ _G of the terminal voltage v _G of the synchronous generator 2, and 10-8b generates power by differentiating the phase θ _G of the terminal voltage v _G. it is the angular velocity calculator for calculating an angular velocity omega _G of the machine terminal voltage v _G. Further, 10-8C is a voltage amplitude calculator that estimates the amplitude _{V E} of the internal induced voltage of the synchronous generator 2 from the angular velocity omega _G terminal voltage _{v G, 10-8d} is the angular velocity omega _G terminal voltage _{v G} This is a phase difference estimator that estimates the terminal voltage phase difference Δθ relative to the phase θ _E of the internal induced voltage from the d-axis current command value I _d ^* and the amplitude V _E of the internal induced voltage of the synchronous generator 2.

Reference numeral 10-8e denotes a power estimation unit that obtains a generator active power estimated value P _G 'from the d-axis current command value I _d ^* , the terminal voltage v _G, and the phase difference Δθ of the terminal voltage with respect to the phase θ _E of the internal induced voltage. is there. 10-8f subtraction unit for subtracting the generator active power _{P G} from the generator active power estimate _{P G} 'obtained by the power estimation unit 10-8e, 10-8g integrates the output of the subtraction section 10-8f integration a part, the integrating section 10-8g phase difference estimates from the difference between the generator active power P _G is the output of the power estimation section 10-8e output P _{G 'and} the generator effective power computing unit 10 - Is output as a phase difference correction signal θc.

Furthermore, 10-8H in subtraction unit, the subtraction unit 10-8H is the generator terminal voltage phase detecting unit 10-8a outputs theta _G and phase difference estimation unit outputs Δθ and the output of the integration section 10-8g of 10-8d from theta _C, as θ _G -Δθ + θ _C, and calculates an internal induced voltage phase estimate theta _E '.

The arithmetic unit 10-6 shown in FIG. 4 calculates the output voltage command value v _{C of the} converter 3 from the internal induced voltage phase estimated value θ _E ′, the d-axis voltage command value V _d ^*, and the q-axis voltage command value V _q ^{*. *} Is obtained and output to the gate pulse generation circuit 10-7.

The above has described an example in which the internal induced voltage phase estimation value θ _E ′ of the synchronous generator 2 is obtained from the terminal voltage v _G of the synchronous generator 2 and the d-axis current command value I _d ^*. The same effect can be obtained by using d-axis current I _d instead of _d ^* .

  Next, the operation of the control device of the wind power generation system configured as described above will be described with reference to FIGS.

In FIG. 5, the voltage amplitude calculation unit 10-8c is configured such that the amplitude V _E of the generator internal induced voltage is proportional to the angular velocity ω _G.
V _E = kω _G
VE is obtained as follows. However, k is an amount determined by the intensity of excitation. When the synchronous generator 2 is a permanent magnet synchronous generator, k is a constant. When the synchronous generator 2 is a synchronous machine with an excitation circuit, k is proportional to the excitation current. In any case, k can be obtained from the constant or set value of the synchronous generator 2.

The vector when the generator current is equal to the d-axis current I _d is shown in FIG. However, the generator internal impedance is expressed by the sum of the resistance value R _G and the inductance L _G. Therefore, assuming that the generator current is controlled according to the d-axis current command value I _d ^* , the phase difference estimation unit 10-8d is based on the vector diagram of FIG.
Δθ = tan ⁻¹ {ΔV _L / (V _E + ΔV _R )}
= Tan ⁻¹ {−ωL _G I _d ^* / (V _E −R _G I _d ^* )}
.DELTA..theta. The value obtained by subtracting the output Δθ of the phase difference estimation unit 10-8d the output theta _G of the voltage phase detection unit 10 -8 A, as is apparent from the vector diagram of FIG. 6, the internal induced voltage of the synchronous generator 2 phases equal to the θ _E.

In the power estimation unit 10-8e, from the three-phase voltages v _GR , v _GS , v _GT , the output Δθ of the phase difference estimation unit 10-8d and the d-axis current command value I _d ^* ,
P _G ′ = {(2/3) (v _GR ² + v _GS ² + v _GT ² )} ^0.5 I _d ^* cos (Δθ)
As a result, a generator active power estimated value P _G ′ is obtained.

Estimation of Δθ in the phase difference estimation unit 10-8D, the output of the generator when shifted in such internal impedance changes, P _{G 'and} the generator active power calculation unit 10-1 obtained by the power estimator 10-8e difference between the generator active power P _G is occurs. In this case, the output θ _C obtained by integrating the difference between the generator active power estimation P _G ′ obtained by the power estimation unit 10-8e and the generator active power P _G by the integration unit 10-8g changes, and the addition / subtraction unit 10 Correct the output-8H, settles in a state that is no longer a difference between the P G _'and P _G.

Accordingly, the internal induced voltage phase estimation value θ _E ′, which is the output of the adder / subtractor 10-8h, is equal to the internal induced voltage phase θ _E obtained from the magnetic pole rotation angle θ _M of the synchronous generator 2, so that the first implementation without detecting the magnetic pole rotation angle theta _E of the synchronous generator 2 by the magnetic pole rotation angle detector as the form, it is possible to obtain the same effects as the first embodiment.

The above has described an example in which the internal induced voltage phase estimation value θ _E ′ of the synchronous generator 2 is obtained from the terminal voltage v _G of the synchronous generator 2 and the d-axis current command value I _d ^*. The same effect can be obtained by using d-axis current I _d instead of _d ^* . This is because the d-axis current I _d is controlled to be equal to the d-axis current command value I _d ^* .

Thus, according to the second embodiment of the present invention, the terminal voltage of the synchronous generator detected by the voltage detector and the current of the synchronous generator detected by the current detector are input, and the synchronous generator is effective. By controlling the input voltage of the converter so that the electric power becomes equal to a preset active power command value, the magnetic pole rotation angle θ _R is not detected by using the magnetic pole rotation angle detector, and the first embodiment Similarly, the synchronous generator 2 and the converter 3 can be stably operated synchronously. That is, even if the rotational speed of the synchronous generator 2 changes, the converter 3 operates synchronously with the synchronous generator 2.

(Third embodiment)
FIG. 7 is a block diagram showing a third embodiment of the control device for a wind power generation system according to the present invention. The same parts as those in FIG. 1 are denoted by the same reference numerals and the description thereof is omitted, and different parts will be described here.

In the third embodiment, as shown in FIG. 7, the magnetic pole rotation angle θ _R detected by the magnetic pole rotation angle detector 7 provided in the synchronous generator 2 and the active power command value P _G ^* are input and corrected. The active power command value correction unit 15 for outputting the active power command value P _G6 ^* to the converter control device 10 is provided.

  FIG. 8 is a block diagram showing a specific configuration example of the active power command value correction unit 15.

In FIG. 8, 15-1 is a subtraction unit for obtaining a difference ΔP _G1 ^* between the active power command value P _G ^* and the corrected active power command value P _G6 ^*, and 15-2 is output from the subtraction unit 15-1. the difference [Delta] P _G1 ^*, a limiting characteristic adjustment gain determining the limit amount [Delta] P _G2 ^* to limit the active power command value _{P G6} ^* and the active power command value _P ^{G *} of the amount of deviation of the modified.

Reference numeral 15-3 denotes an angular velocity detection unit that obtains an angular velocity ω _G from the magnetic pole rotation angle θ _R detected by the magnetic pole rotation angle detector 7, and reference numeral 15-4 denotes an angular velocity ω _G obtained by the angular velocity detection unit 15-3. On the other hand, an upper limit speed ω _UL and a speed deviation amount detection unit for obtaining an angular speed Δω _G deviating from the lower limit speed ω _LL , 15-5 is a difference ΔP _G2 ^* output from the control characteristic adjustment gain 15-2 and a speed deviation amount detection unit. 15-4 is an adder for obtaining an added value ΔP _G5 ^* with the deviated angular velocity ω _G output from 15-4, and 15-6 is an effective after correction by integrating the added value ΔP _G5 ^* obtained by the adder 15-5 It is an integration unit that outputs a power command value P _G6 ^* .

In the above description, the magnetic pole rotation angle θ _R detected by the magnetic pole rotation angle detector 7 is input to the angular velocity detection unit 15-3, but the generator terminal voltage phase shown in FIG. 5 is used instead of the angular velocity detection unit 15-3. You may obtain | require the angular velocity (omega) _G of the synchronous generator 2 using the detection part 10-8a and the angular velocity calculating part 10-8b. Further, the angular velocity ω _G of the synchronous generator 2 may be obtained from the magnetic pole rotation angle estimated value θ _E ′.

  Next, the operation of the control device of the wind power generation system configured as described above will be described.

If the angular speed ω _G of the synchronous generator 2 is within the range between the upper limit speed ω _UL and the lower limit speed ω _LL , the output Δω _G of the angular speed deviation detecting unit 15-4 is 0, and the integrating unit 15− 6 input ΔP _G5 ^* is equal to the limit amount difference ΔP _G2 ^* . The limit amount ΔP _G2 ^* is zero, that is, the corrected active power command value P _G6 ^* is set equal to the active power command value P _G ^* .

When the angular speed ω _G of the synchronous generator 2 exceeds the upper limit speed ω _UL , the input of the integrating unit 15-6 is ΔP _G2 ^* + Δω _G = ΔP _G2 ^* + (ω _G −ω _UL )
Therefore, the corrected active power command value P _G6 ^* is set in a state where the input of the integrating unit 15-6 is zero, that is, the angular velocity ω _G is equal to ω _UL −ΔP _G2 ^* . When the value of the control characteristic adjustment gain 15-2 is reduced, the limit amount ΔP _G2 ^* becomes a small value, so that the angular velocity ω _G is stabilized at a value substantially equal to the upper limit velocity ω _UL . Similarly, when the angular speed ω _G is less than the lower limit speed ω _LL , the angular speed ω _G is substantially equal to the lower limit speed ω _LL .

Here, the relationship between the corrected active power command value P _G1 ^* and the operating point will be described with reference to FIG. 9 showing a characteristic example of the windmill.

In FIG. 9, curves c _{1 to} c ₅ show examples of the rotational speed of the windmill and the windmill output characteristics. However, a characteristic example for the five wind speed, the curve c ₁ is characteristic for operable minimum wind speed, the curve c ₅ is a characteristic for the driver can best wind speed.

As an example, a case where the wind speed is a curve c ₄ and the active power command value P _G ^* is p ₁ will be described as an example.

  For convenience, the efficiency of the generator and converter will be described as 100%.

Since the generator active power _{P G} is controlled to _{p 1, P 1} (i.e., ₁ angular velocity _omega, the output _{p 1)} point on the curve _{c 4} will be operating at. This is because when the angular velocity is slower than ω ₁ , since the windmill output P _W is larger than the generator active power p _1, it is accelerated by the power of (P _W −p ₁ ), and the angular velocity is faster than ω _1. case, the windmill output _{P W} is smaller than the generator active power _{p 1, (p} 1 -P _W) is reduced at the power, eventually wind turbine output _{P W} points _{P 1} on the curve _{c 4} which becomes _{p 1} Will drive in.

  Next, the operation when the wind speed changes suddenly will be described with reference to FIG.

Now, intensified wind speed when driving at a point P ₁ on the curve c _4, if you change the characteristics of the curve c _5, point P ₂ on the curve c _{5 (i.e., 2} angular velocity _omega, the output is The operating point is about to move to p ₁ ).

However, since the angular velocity ω _G exceeds the upper limit velocity ω _UL , the output Δω _G of the angular velocity deviation detecting unit 15-4 in FIG. Then, the corrected active power command value P _G6 ^* increases and the operating point moves to a point P ₃ on the curve c ₅ (that is, the angular velocity is ω _UL and the output is p ₃ ). Therefore, it can be avoided that the angular speed ω _G exceeds the upper limit speed ω _UL and the operation is continued.

Contrary to the above example, weakened wind speed when operating at a point P ₁ on the curve c _4, for example if the changes to the characteristics of curve c _3, the characteristic curve c _3, the wind turbine output active power p Since it is less than ₁ , deceleration continues.

However, since the angular velocity ω _G is less than the lower limit velocity ω _LL, the output Δω _G of the angular velocity deviation detecting unit 15-4 in FIG. 8 is a negative value, and the input of the integrating unit 15-6 is also a negative value. . Then, the corrected active power command value P _G6 ^* decreases and the operating point moves to a point P ₄ on the curve c ₃ (that is, the angular velocity ω _G is ω _LL and the output is p ₄ ). Therefore, it is possible to avoid continuing the operation at the angular speed ω _G less than the lower limit speed ω _LL .

  Therefore, even when the wind speed fluctuates, the rotational speed (angular speed) to be operated can be limited to the range from the lower limit speed to the upper limit speed, so that stable operation can be achieved without stalling or overspeed.

  As described above, according to the third embodiment of the present invention, in addition to obtaining the same operational effects as those of the first embodiment, it is possible to stably operate even when installed in a place where the fluctuation of the wind speed is severe. it can.

(Fourth embodiment)
FIG. 10 is a block diagram showing another configuration example of the active power command value correction unit 15 shown in FIG. 7 as the fourth embodiment of the present invention. The same parts as those in FIG. Omitted and only the differences are described here.

  In the fourth embodiment, a speed deviation amount detection unit 15-7 having hysteresis characteristics is provided in place of the speed deviation amount detection unit 15-4 in FIG. 8, and the other configuration is the same as that in FIG. .

In the active power command value correction unit 15 having such a configuration, the speed deviation amount detection unit 15-7 has a hysteresis characteristic as shown in FIG. That is, once the angular speed ω _G input from the speed detector 15-3 exceeds the upper limit speed ω _UL or less than the lower limit speed ω _LL , the speed limit is narrowed by a predetermined hysteresis width. is there.

Accordingly, when such a speed deviation amount detection unit 15-7 is provided, even when a speed deviation occurs due to an instantaneous wind speed change, an output when the angular speed ω _G is narrower by the hysteresis width inside the speed upper and lower limits. , that is, [Delta] [omega _G can be operated in a large state, in addition to the operational effect of the above-described embodiments, also a stable operation against a sudden change in wind speed.

(Fifth embodiment)
FIG. 12 is a block diagram showing a fifth embodiment of the control apparatus for a wind power generation system according to the present invention. The same parts as those in FIG. 1 are denoted by the same reference numerals and the description thereof is omitted, and different parts will be described here.

In the fifth embodiment, as shown in FIG. 12, the magnetic pole rotation angle θ _R detected by the magnetic pole rotation angle detector 7 provided in the synchronous generator 2 is input, and the corrected active power command value P _G6 ^{* is} corrected ^. Is provided with an active power command value correction unit 16 that outputs the power to the converter control device 10.

  FIG. 13 is a block diagram illustrating a configuration example of the active power command value correction unit 16.

In FIG. 13, 16-3 is a speed detection unit for obtaining an angular velocity ω _G from the magnetic pole rotation angle θ _R detected by the magnetic pole rotation angle detector 7, and 16-4 is an angular velocity ω obtained by the speed detection unit 16-3. _It is a speed deviation amount detection unit for obtaining an angular speed Δω _G deviating from the upper limit speed ω _UL and the lower limit speed ω _{LL with} respect to _G.

Reference numeral 16-7 denotes a maximum power calculation unit for obtaining the maximum power P _M from the angular velocity ω _G input from the speed detection unit 16-3, and 16-1 denotes a maximum power P _M obtained by the maximum power calculation unit 16-7. subtracting unit for obtaining a difference [Delta] P _G1 ^* of the active power command value _{P G6} ^* after correction and, 16-2 from the difference [Delta] P _G1 ^* output from the subtraction unit 16-1, the active power command value after correction _{P G6} ^This is a limiting characteristic adjustment gain for obtaining a limit amount ΔP _G2 ^* for limiting a deviation amount between ^* and the active power command value P _G ^* .

Further, 16-5 adds the difference ΔP _G2 ^* output from the limiting characteristic adjustment gain 15-2 and the angular velocity ω _G deviated from the speed deviation detection unit 16-4 to obtain an added value ΔP _G5 ^* . An addition unit 16-6 to be obtained is an integration unit that integrates the addition value ΔP _G5 ^* obtained by the addition unit 16-5 and outputs a corrected active power command value P _G6 ^* .

In the above description, the magnetic pole rotation angle θ _R detected by the magnetic pole rotation angle detector 7 is input to the angular velocity detection unit 16-3, but the generator terminal voltage phase shown in FIG. 5 is used instead of the angular velocity detection unit 16-3. You may obtain | require the angular velocity (omega) _G of the synchronous generator 2 using the detection part 10-8a and the angular velocity calculating part 10-8b. Further, the angular velocity ω _G of the synchronous generator 2 may be obtained from the magnetic pole rotation angle estimated value θ _E ′.

  FIG. 14 is a block diagram illustrating a specific configuration example of the maximum power calculation unit 16-7.

16-7a, the arithmetic unit for determining the amplitude _{V E} of the internal induced voltage of the synchronous generator 2 from the angular velocity ω _G, 16-7b, the arithmetic unit for obtaining the maximum input _{P M1} of the converter 3 from the amplitude _{V E} of the internal induced voltage and a, 16-7C, the arithmetic unit for obtaining the maximum output _{P M2} of the synchronous generator 2 from the amplitude value _{V E} of the internal induced voltage, 16-7D includes an output _{P M1} of the arithmetic unit 16-7b calculation unit 16 from 7c output P _M2 Prefecture of a low value selector for outputting a maximum power P _M by selecting the smaller value.

  Next, the operation of the control device of the wind power generation system configured as described above will be described. Since the operation is the same as that described with reference to FIG. 8 except for the maximum power calculation unit 16-7, the operation of the maximum power calculation unit 16-7 will be described with reference to FIG.

The converter control device 10 controls the generator current so as to be the d-axis current I _d that is the in-phase component current of the generator internal induced voltage. Therefore, in the arithmetic unit 16-7b,
P _M1 = V _E I _M
Then, P _M1 is obtained. However, I _M is the maximum current of the converter 3.

Further, if the resistance value of the generator windings and R _G, the active power P _G of the synchronous generator,
_{P G = V E I d -R} G I d 2 = V E 2 / 4R G -R G (I d -V E / 2R G) 2
It becomes. The maximum value of active power _{P G} is when the second term of this expression is _0, because it is ^V E 2 / 4R _G, calculation unit 16-7c is,
P _M2 = V _E ² / 4R _G
P _M2 is obtained as follows.

The maximum power P by the maximum power calculation section 16-7 converter control device active power command value to the 10 _{P G6} ^* is computed _{P M,} i.e., the maximum power _{P M1} or synchronous generator 2 which can be extracted by the converter 3 can output Settling in a state where it is equal to the smaller value of _M2 .

Here, assuming a case where a permanent magnet synchronous generator is used as the synchronous generator 2, when the maximum powers P _M1 and P _M2 are overlaid on the wind turbine characteristic curve of FIG. 9, it becomes as shown in FIG. The operating points at are the intersections P ₅ , P ₆ , P ₇ , P ₈ , P ₉ of the maximum powers P _M1 and P _M2 .

  As is apparent from FIG. 15, it can be seen that both the synchronous generator 2 and the converter 3 can be operated at the maximum allowable output regardless of the wind speed.

  When the wind speed fluctuates greatly, it is common to determine the rating of the power converter from an average over a long period of time. Therefore, when the wind speed is high, the capacity of the power converter is insufficient with respect to the wind turbine output. However, according to the fifth embodiment of the present invention, the synchronous generator and the power converter are stepped out. In addition, effective power that can be output from the synchronous generator can be efficiently extracted, and the system can be operated as an optimum system even when the capacity of the power converter is small with respect to the wind turbine output.

(Sixth embodiment)
FIG. 16 is a block diagram showing a sixth embodiment of the control apparatus for a wind power generation system according to the present invention. The same parts as those in FIG. 12 are assigned the same reference numerals and explanations thereof are omitted, and different parts will be described here.

In the sixth embodiment, as shown in FIG. 16, a d-axis current command value correction unit 18 is provided in place of the active power command value correction unit 16 in FIG. 12, and magnetic pole rotation is performed in place of the converter control device 10 in FIG. Converter control in which the magnetic pole rotation angle θ _R of the synchronous generator 1 detected by the angle detector 7, the current i _G detected by the current detector 8, and the output I _d1 ^{* of the} d-axis current command value correction unit 18 are input. The configuration is the same as that of FIG. 12 except that the device 17 is provided.

  FIG. 17 is a block diagram illustrating a specific configuration example of the converter control device 17.

In FIG. 17, reference numeral 17-3 denotes d in phase with the generator internal induced voltage from the magnetic pole rotation angle θ _R of the synchronous generator 1 detected by the magnetic pole rotation angle detector 7 and the current i _G detected by the current detector 8. axis current _{I d} and the current detector for detecting the 90-degree advanced q-axis current _{I q,} 17-4 current detection unit 17-3 detected d-axis current _{I d} at the d-axis current command value correction section 18 The d-axis current control unit 17-5 outputs a d-axis voltage command value V _d ^* by performing a proportional-integral calculation so as to be equal to the d-axis current command value I _d1 ^* output by the current detector 17-3. The q-axis current control unit outputs a q-axis voltage command value V _q ^* by performing a proportional integral calculation so that the detected q-axis current I _q becomes zero.

Furthermore, 17-6 d-axis voltage command value V _d ^* and the q-axis output from the magnetic pole rotation angle theta _R and d-axis current control unit 17-4 of the synchronous generator 1 detected by the magnetic pole rotation angle detector 7 An arithmetic unit 17-7 for obtaining the output voltage command value v _C ^* of the converter 3 from the q-axis voltage command value V _q ^* output from the current control unit 17-5, and an output obtained by the arithmetic unit 17-6 This is a gate pulse generation circuit that outputs a gate pulse signal g _C for controlling the converter 3 based on the voltage command value v _C ^* .

  FIG. 18 is a block diagram illustrating a configuration example of the d-axis current command value correction unit 18.

In FIG. 18, 18-3 is an angular velocity detector that obtains an angular velocity ω _G from the magnetic pole rotation angle θ _R detected by the magnetic pole rotation angle detector 7, and 18-4 is an angular velocity ω obtained by this angular velocity detector 18-3. _This is a speed deviation amount detection unit for obtaining a speed Δω _G deviating from the upper limit speed ω _UL and the lower limit speed ω _LL with respect to _G.

Reference numeral 18-7 denotes a maximum current calculation unit for obtaining the maximum current I _M from the angular velocity ω _G inputted from the angular velocity detection unit 18-3, and 18-1 denotes a maximum current I _M obtained by the maximum current calculation unit 18-7. The subtractor 18-2 calculates a difference ΔI _G ^* between the corrected d-axis current command value I _d6 ^* and the corrected effective current command value I _G6 ^* and the maximum current I from the output of the subtractor 18-1. _This is a limiting characteristic adjustment gain for obtaining a limiting amount ΔI _G2 ^* for limiting the amount of deviation from _M.

Further, 18-5 adds the difference ΔI _G2 ^* output from the limiting characteristic adjustment gain 18-2 and the angular frequency Δω _G output from the speed deviation detection unit 18-4 to obtain the added value ΔI _G5 ^* . An adding unit 18-6 is an integrating unit that integrates the added value ΔI _G5 ^* obtained by the adding unit 18-5 and outputs a corrected effective current command value I _G6 ^* .

  FIG. 19 is a block diagram illustrating a specific configuration example of the maximum current calculation unit 18-7.

Up In FIG. 19, 18-7a arithmetic unit for determining the amplitude _{V E} of the internal induced voltage of the synchronous generator 2 from the angular velocity ω _G, 18-7c the active power of the synchronous generator 2 from the amplitude _{V E} of the internal induced voltage It is a calculating part which calculates _| requires d-axis current I _M2 which becomes. Reference numeral 18-7d is a low-value selector that receives the d-axis current I _M2 that maximizes the active power of the synchronous generator ₂ and the maximum current value I _M1 of the converter 3, and outputs a d-axis current command value I _d1 ^*. It is.

  Next, the operation of the control device of the wind power generation system configured as described above will be described.

  In the sixth embodiment, the difference from the fifth embodiment is that a generator current is used instead of the generator active power.

_{P G = V E I d -R} G I d 2 = V E 2 / 4R G -R G (I d -V E / 2R G) 2
, And the the _{P G} is maximum, when the second term is zero, that _is, when _{I d = V E / 2R G} . Therefore, in the calculation unit 18-7c,
I _M2 = V _E / 2R _G
Then, the d-axis current I _M2 is obtained.

Therefore, the d-axis current command value I _d1 ^* to the converter control device 17 is calculated by the maximum current calculation unit 18-7 from the rated current I _M1 of the converter 3 or the d-axis current I _M2 that maximizes the effective power of the synchronous generator. The smaller value is used.

Since the generator current is controlled within the induced voltage in phase, active power _{P G} of the synchronous generator _is a ^{_{P G = V E × I d1}} * -R G (I d1 *) 2. Expressed in active power P _G, the operating point of each wind speed as in the fifth embodiment is represented in Figure 15.

  As described above, according to the sixth embodiment of the present invention, the same effect as that of the fifth embodiment can be obtained even when the active power command value is not given, and the synchronous generator can be used regardless of the wind speed. 2 and the converter 3 can be operated at the maximum allowable output, and the control configuration can be simplified as compared with the fifth embodiment.

The block diagram which shows 1st Embodiment of the wind power generation system by this invention. The block diagram which shows the structure of the converter control apparatus in the same embodiment. The block diagram which shows 2nd Embodiment of the wind power generation system by this invention. The block diagram which shows the specific structural example of the converter control apparatus in the embodiment. FIG. 5 is a block diagram illustrating a specific configuration example of a phase detection unit illustrated in FIG. 4. The vector diagram for demonstrating the effect | action of the phase estimation part in the embodiment. The block diagram which shows 3rd Embodiment by the wind power generation system by this invention. The block diagram which shows the specific structural example of the active power command value correction | amendment part in the embodiment. The characteristic view which shows an example of the relationship between windmill speed versus windmill output in the same embodiment. The block diagram which shows the other structural example of the active power command value correction | amendment part shown in FIG. 7 as the 4th Embodiment of this invention. The hysteresis characteristic figure given to the speed deviation of the speed deviation detection part in the same embodiment. The block diagram which shows 5th Embodiment by the wind power generation system by this invention. The block diagram which shows the structural example of the active power command value correction | amendment part in the embodiment. FIG. 14 is a block diagram illustrating a specific configuration example of a maximum power calculation unit in FIG. 13. The characteristic view which shows an example of the relationship with the windmill speed with respect to a windmill output for demonstrating the effect | action of a maximum electric power calculating part similarly. The block diagram which shows 6th Embodiment of the wind power generation system by this invention. The block diagram which shows the specific structural example of the converter control apparatus in the embodiment. The block diagram which shows the structural example of the d-axis current command value correction part in the embodiment. The block diagram which shows the specific structural example of the maximum electric current calculating part of FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Windmill, 2 ... Synchronous generator, 3 ... Converter, 4 ... DC capacitor, 5 ... Inverter, 6 ... Electric power system, 7 ... Magnetic pole rotation angle detector, 8, 13 ... Current detection , 9, 11, 14 ... voltage detector, 10, 17 ... converter control device, 12 ... inverter control device, 15, 16 ... active power command value correction unit, 18 ... current command value correction unit, 10-1: Generator active power calculation unit, 10-2: Power control unit, 10-3, 17-3 ... Current detection unit, 10-4, 17-4 ... d-axis current control unit, 10 -5, 17-5: q-axis current control unit, 10-6, 17-6: calculation unit, 10-7, 17-7: gate pulse generation circuit, 10-8: phase estimation unit, 10 -8a: phase detector, 10-8b: angular velocity calculator, 10-8c: voltage amplitude calculator, 10-8d ... Phase difference estimation unit, 10-8e ... Power estimation unit, 10-8f ... Subtraction unit, 10-8g ... Integration unit, 10-8h ... Addition / subtraction unit, 15-1, 16-1, 18-1 ...... Subtracting unit, 15-2, 16-2, 18-2 ... Limiting characteristic adjustment gain, 15-3, 16-3, 18-3 ... Speed detecting unit, 15-4, 16-4, 18- 4. Speed deviation amount detection unit, 15-5, 16-5, 18-5 ... Addition unit, 15-6, 16-6, 18-6 ... Integration unit, 15-7 ... Speed deviation amount detection , 16-7... Maximum power calculation unit, 18-7... Maximum current calculation unit, 16-7a, 16-7b, 16-7c, 18-7a, 18-7c ... Calculation unit, 16-7d, 18-7d ...... Low value selection part

Claims (10)

In a control device of a wind power generation system that controls a power converter in which an input end is connected to a synchronous generator coupled to a windmill and an output end is connected to a power system or a load,
A magnetic pole rotation angle of the synchronous generator detected by the magnetic pole rotation angle detector and a terminal voltage of the synchronous generator detected by the voltage detector are respectively input, and the effective power of the synchronous generator is set in advance. A terminal voltage command value having a phase corresponding to the magnetic pole rotation angle of the synchronous generator so as to be equal to the power command value is obtained, and the input of the power converter is set so that the terminal voltage of the synchronous generator becomes the voltage command value. A control device for a wind power generation system comprising a converter control device for controlling a side voltage. In the control apparatus of the wind power generation system according to claim 1,
The converter controller is
Power control means for outputting an active power divided current command value such that the active power of the synchronous generator is equal to a preset active power command value;
Current detection means for detecting a current in phase with the magnetic pole rotation angle from the magnetic pole rotation angle of the synchronous generator and the current of the synchronous generator detected by the magnetic pole rotation angle detector;
Calculation means for obtaining a voltage command value for controlling the input voltage of the power converter so that the current output from the current detection means is equal to the active power component current command value output from the power control means;
The control apparatus of the wind power generation system characterized by comprising. In a control device of a wind power generation system that controls a power converter in which an input end is connected to a synchronous generator coupled to a windmill and an output end is connected to a power system or a load,
Phase estimation means for obtaining an internal induced voltage phase estimation value of the synchronous generator by inputting a terminal voltage of the synchronous generator and a current or a current command value of the synchronous generator;
Power control means for outputting an active power divided current command value such that the active power of the synchronous generator is equal to a preset active power command value;
Current detection means for detecting a current in phase with the internal induction voltage phase estimation value from the phase estimation value of the internal induction voltage of the synchronous generator estimated by the phase estimation means and the current of the synchronous generator;
Voltage control for calculating a voltage command value for controlling the input side voltage of the power converter so that the current output from the current detection unit is equal to the active power component current command value output from the power control unit And a converter control device comprising: means for controlling a wind power generation system. In the control apparatus of the wind power generation system according to claim 3,
The phase estimation means includes
A phase difference estimating means for inputting a terminal voltage of the synchronous generator and a current or a current command value and estimating a phase difference of the terminal voltage with respect to an internal induced voltage of the synchronous generator;
Active power estimation means for obtaining an estimated value of the active power of the synchronous generator from the phase difference of the terminal voltage with respect to the internal induced voltage of the synchronous generator estimated by the terminal voltage of the synchronous generator and the phase difference estimation means;
A phase difference correcting means for correcting the phase difference estimated value estimated by the phase difference estimating means from a value obtained by subtracting the active power of the synchronous generator from the active power estimated value of the synchronous generator determined by the active power estimating means; A control device for a wind power generation system, characterized by being configured. In the control apparatus of the wind power generation system of Claim 1 or Claim 2,
An active power command value is corrected according to the speed of the wind turbine or the synchronous generator, and an active power command value correcting unit that provides the corrected active power command value to the converter control device is provided,
This active power command value correction unit
Limiting characteristic adjusting means for obtaining a limiting amount for limiting a deviation amount between the active power command value and the corrected active power command value;
Speed detecting means for detecting the speed of the synchronous generator;
It is detected whether or not the upper limit speed and the lower limit speed set in advance are deviated from the speed output from the speed detection means, and when the speed deviates, the difference between the speed and the upper limit speed or the lower limit speed is output. Speed deviation detection means;
Integrating means for integrating an added value of the deviating speed output from the speed deviation amount detecting means and the limit amount output from the limit characteristic adjusting means, and outputting the result as a corrected active power command value. A control device for a wind power generation system. In the control apparatus of the wind power generation system of Claim 3 or Claim 4,
Correcting the active power command value according to the speed of the wind turbine or the synchronous generator, and providing an active power command value correction unit that gives the corrected active power command value to the converter control device,
This active power command value correction unit
Limiting characteristic adjusting means for obtaining a limiting amount for limiting a deviation amount between the active power command value and the corrected active power command value;
Speed detecting means for detecting the speed of the wind turbine or the synchronous generator;
It is detected whether or not the upper limit speed and lower limit speed set in advance are deviated from the speed of the synchronous generator output from the speed detection means. A speed deviation detecting means for outputting a difference;
Integrating means for integrating an added value of the deviating speed output from the speed deviation amount detecting means and the limit amount output from the limit characteristic adjusting means, and outputting the result as a corrected active power command value. A control device for a wind power generation system. In the control apparatus of the wind power generation system according to claim 5 or 6,
The speed deviation amount detection means has a hysteresis characteristic in the speed deviation amount so that the speed limit is narrowed by a predetermined width when the speed input from the speed detection means deviates from the upper limit speed or the lower limit speed. A control device for a wind power generation system. In the control apparatus of the wind power generation system according to claim 5 or 6,
An allowable maximum active power calculating means for obtaining the allowable maximum active power of the synchronous generator by inputting the speed of the wind turbine or the synchronous generator detected by the speed detecting means is provided, and the allowable maximum active power calculating means is obtained. A control device for a wind power generation system, wherein an allowable maximum active power is used as an active power command value. In a control device of a wind power generation system that controls a power converter in which an input end is connected to a synchronous generator coupled to a windmill and an output end is connected to a power system or a load,
The magnetic pole rotation angle of the synchronous generator detected by the magnetic pole rotation angle detector, the current of the synchronous generator detected by the current detector are input, and the effective current of the synchronous generator is equal to the effective current command value The terminal voltage command value having a phase corresponding to the magnetic pole rotation angle of the synchronous generator is obtained, and the input voltage of the power converter is controlled so that the terminal voltage of the synchronous generator becomes the terminal voltage command value. A converter control device,
A current command value control unit that provides the converter controller with the allowable maximum active current obtained from the rotational speed of the synchronous generator and the lower value of the rated current of the power converter as an active current command value. A control device for a wind power generation system.   A wind turbine, a synchronous generator coupled to the wind turbine, a power converter having an input end connected to the synchronous generator and an output end connected to an electric power system or a load, and controlling the power converter A wind power generation system comprising the control device according to any one of claims 1 to 9.

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