JP2014053996A - Controller for rotary electric machine, rotary electric machine, and wind power generation system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve power generation efficiency of a rotary electric machine.SOLUTION: According to an embodiment, a controller for a rotary electric machine comprising: a first rotor; a plurality of second rotors which are arranged around the first rotor so as to magnetically couple with the first rotor and are made to increase speed depending on rotation of the first rotor; and a plurality of power generators which are arranged on the inner peripheral side of the plurality of second rotors, respectively, and generate power depending on the rotation frequencies of the second rotors comprises means for performing setting so that an individual power generator output instruction for each power generator uniformly shows a value of P% (where 0%<P<100%) of maximum output of each power generator when a total power generator output instruction shows a value of P% of maximum output.

Description

  Embodiments described herein relate generally to a rotating electrical machine control device, a rotating electrical machine, and a wind power generation system.

  In rotating electrical machines such as large-capacity generators, it is known that the generator physique is inversely proportional to the rotational speed of the generator. In a rotating electrical machine that uses natural energy such as wind power, tidal power, and wave power as a power source, the turbine blades convert natural energy into rotational energy, but the rotational speed is low, and the rotational energy obtained by the turbine blades is directly converted. When transmitted to the generator, the generator size tends to be large.

  In order to reduce the size of the generator, it is common to place a mechanical speed increaser between the turbine blade and the generator to increase the rotational speed of the generator. A rotating electric machine that increases the speed of the machine has also been proposed.

  Conventionally, a rotating electrical machine using a magnetic worm gear is provided with a large toroid-shaped rotor on the rotating shaft on which the turbine blades are arranged, and the small rotor with the axis perpendicular to the rotating shaft of the large rotor on the same circumference of the large rotor. There is a configuration in which one or a plurality of rotors are arranged. Spiral magnetic poles formed of permanent magnets are alternately arranged on the outer peripheral surface of the small rotor, and the peripheral surface of the large rotor is magnetically coupled according to the magnetic pole spacing of the small rotor. Permanent magnets are arranged on the magnetic poles. A generator such as an independent outer rotor type permanent magnet generator is arranged on the inner diameter side of the small rotor, and when the large rotor rotates, the small rotor is determined by the number of magnetic poles of the large rotor and the gear ratio of the small rotor. Thus, the rotational speed of the small rotor is increased, and power is generated in the generator in the small rotor.

  In this magnetic worm gear, the large rotor and the small rotor are not mechanically in contact with each other, so that the transmission efficiency of the magnetic force is high, and there is an advantage over the mechanical speed increaser in terms of maintainability.

British Patent Application No. 2463102

  In a turbine power generation device using natural energy, the power generation output that can be generated is determined according to the flow velocity of wind power, tidal power, wave power, etc., which is an energy source, and therefore it is not always possible to generate power with a constant power generation output. Further, the power generation efficiency of the generator varies depending on the power generation output, and not all power generation outputs can be operated at the highest efficiency. In such a system, when the power generation output fluctuates, the efficiency is deteriorated, that is, the loss is increased, and the total power generation amount as the power generation device cannot be maximized.

  Problem to be solved by the invention is to provide a control device for a rotating electrical machine, a rotating electrical machine, and a wind power generation system capable of improving power generation efficiency.

  According to the embodiment, a plurality of control devices for the rotating electrical machine are arranged around the first rotor so as to be magnetically coupled to the first rotor and the first rotor. A plurality of second rotors that are accelerated according to rotation, and a plurality of power generators that are arranged on the inner peripheral side of the plurality of second rotors and generate electric power according to the rotational speed of the second rotors When the total power generation output command shows a value of P% (however, 0% <P <100%) with respect to the maximum output, the individual power generator output command for each generator Includes means for uniformly setting the value of P% with respect to the maximum output of each generator.

The perspective view which shows an example of schematic structure of the wind power generation system common to each embodiment. The conceptual diagram which shows an example of the internal structure of the nacelle in the wind power generation system of FIG. The perspective view which shows an example of the structure of the rotary electric machine installed in the nacelle shown in FIG. Sectional drawing which shows the schematic shape of a cross section at the time of seeing the part which cut | disconnected the rotary electric machine in the surface A in FIG. 3 from the axial direction of a small rotor. The conceptual diagram for demonstrating the structure formed so that a helical magnetic pole might be alternately arrange | positioned by the permanent magnet on the outer peripheral surface of a small rotor. The figure which shows an example of a structure of the electric power generation control system with which a rotary electric machine is equipped. The block diagram which shows an example of a function structure of a high-order power generation control part. The figure which shows an example of the structure regarding an individual electric power generation control part, a converter, and a generator. The block diagram which shows an example of a function structure of an individual electric power generation control part. The figure which shows the characteristic by which the electric power generation output with respect to a wind speed is determined according to a wind speed. The figure which shows the specific example of the setting by the separate electric power generation output calculation part of 1st Embodiment. The figure which shows the specific example of the setting by the separate electric power generation output calculation part of 2nd Embodiment. The figure which shows the specific example of the setting by the separate electric power generation output calculation part of 3rd Embodiment. The figure which shows an example of the map showing the efficiency of the generator in 4th Embodiment. The figure which shows an example of a structure of the high-order power generation control part in 5th Embodiment.

  Hereinafter, embodiments will be described with reference to the drawings.

(First embodiment)
First, the first embodiment will be described with reference to FIGS. 1 to 11. Of these drawings, FIGS. 1 to 10 are also applied to other embodiments described later.

  FIG. 1 is a perspective view illustrating an example of a schematic configuration of the wind power generation system according to the first embodiment. FIG. 2 is a conceptual diagram showing an example of the internal configuration of the nacelle in the wind power generation system of FIG.

  The wind power generation system shown in FIG. 1 includes a nacelle 1, a windmill blade 2, and a tower 3 as main elements.

  As shown in FIG. 2, the nacelle 1 is attached to the top of the tower 3, and accommodates the rotating electrical machine 100, and converts the voltage and frequency of power generated from the generator mounted on the rotating electrical machine 100 to other voltages. And a power conversion unit 101 that converts the frequency into a frequency. The electric power after being converted by the electric power conversion unit 101 passes through the inside of the tower 3 through the cable C and is guided downward.

  Note that the power conversion unit 101 may be arranged outside the nacelle 1 (for example, on the ground) instead of being arranged inside the nacelle 1. When the power conversion unit 101 is disposed on the ground, for example, the power generated from the generator is guided downward through the inside of the tower 3 through the cable C, and is guided to the power conversion unit 101 on the ground. .

  The wind turbine blade 2 corresponds to a prime mover in the wind power generation system, and a blade shaft (blade shaft) 2A attached so as to be directly connected to the rotating shaft 11 of the rotating electrical machine 100 in the nacelle 1, and the blade shaft 2A It consists of a plurality of wind turbine blade bodies 2B attached around.

  The tower 3 is installed on the ground and supports the nacelle 1. A cable C for transmitting electric power is provided inside the tower 3. The cable C is guided downward from the nacelle 1 through the inside of the tower 3 and is guided to the outside of the tower 3 in the vicinity of the ground.

  In such a configuration, when the wind turbine blade 2 is rotated by wind power, the rotational force is transmitted from the blade shaft 2A of the wind turbine blade 2 to the rotating shaft 11 of the rotating electrical machine 100 installed in the nacelle 1 and mounted on the rotating electrical machine 100. Electricity is generated by the generated generator. The electric power generated from the generator of the rotating electrical machine 100 is converted by the power conversion unit 101, and then sent from the nacelle 1 through the tower 3 through the cable C to the outside of the tower 3.

  FIG. 3 is a perspective view showing an example of the structure of the rotating electrical machine 100 installed in the nacelle 1 shown in FIG.

  As shown in FIG. 3, the rotating electrical machine 100 includes a toroidal rotor 10 (hereinafter referred to as “large rotor 10”) and one or more cylinders that are spaced apart from the outer periphery of the large rotor 10. Rotor 20 (hereinafter referred to as “small rotor 20”) and, for example, an outer rotor type permanent magnet generator 30 (hereinafter referred to as “generator 30”) disposed on the inner diameter side of the small rotor 20. Have. The generator 30 includes a rotor having a permanent magnet and a stator having a coil, and the rotor is arranged on the outer periphery of the stator.

  The generator 30 is not limited to the outer rotor method, and another method may be adopted. Further, the generator 30 may be arranged on the side surface of the small rotor 20 instead of being arranged on the inner diameter side of the small rotor 20, and at that time, the generator 30 is located on the inner side of the outer peripheral surface of the small rotor 20. You may arrange in.

  As shown in FIG. 3, the large rotor 10 includes a rotating shaft 11 and a support member 12 that are directly connected to the blade shaft 2 </ b> A of the wind turbine blade 2, and is configured to rotate around the rotating shaft 11. The shape of the support member 12 is not limited to the shape illustrated in FIG. That is, the support member 12 is not limited to a plate-like shape over the entire surface as illustrated in FIG. 3. For example, a member provided with a cavity in the middle may be adopted in consideration of weight and ventilation. . The outer peripheral surface of the large rotor 10 forms a semi-annular shape (U-shape) so as to surround the half periphery of the small rotor 20 while keeping the gap with the outer peripheral surface of the small rotor 20 uniform. The small rotor 20 is configured to rotate around a shaft 21 oriented in a direction perpendicular to the direction of the rotation shaft 11 of the large rotor 10. FIG. 4 shows a schematic shape of a cross section when a portion obtained by cutting the rotary electric machine 100 on the surface A in FIG. 3 is viewed from the axial direction of the small rotor 20. As shown in FIG. 4, there is a semi-annular gap G between the large rotor 10 and the small rotor 20.

  The large rotor 10 and the small rotor 20 have permanent magnets on their outer peripheral surfaces, and constitute a magnetic worm gear. That is, a low-speed magnetic gear is formed on the outer peripheral surface of the large rotor 10, a high-speed magnetic gear is formed on the outer peripheral surface of the small rotor 20, and a magnetic worm gear that rotates each small rotor 20 at a higher speed than the large rotor 10 is provided. It is configured. Specifically, on the outer peripheral surface of the small rotor 20, as shown in FIG. 5, spiral magnetic poles are formed in the magnetic material 6 a by the permanent magnet 5 a so that N poles and S poles are alternately arranged, On the other hand, the magnetic poles of the magnetic material 6b are alternately arranged on the outer peripheral surface of the large rotor 10 by the permanent magnet 5b so as to be magnetically coupled according to the magnetic pole spacing of the small rotor 20. Has been.

  At least in the region where the large rotor 10 and the small rotor 20 are magnetically coupled, the magnetic pole spacing of the large rotor 10 and the inclination angle of the magnetic pole pattern are substantially equal to the magnetic pole interval of the small rotor 20 and the inclination angle of the magnetic pole pattern, respectively. It is desirable to be configured as follows.

  In such a configuration, when the large rotor 10 rotates, the magnetic poles of the large rotor 10 and the magnetic poles of the small rotor 20 are attracted or repelled, so that the small rotor 20 rotates following the rotation of the large rotor 10. At this time, the rotation of the small rotor 20 is increased at a gear ratio determined by the number of magnetic poles of the large rotor 10 and the number of gear strips of the small rotor 20, and electric power corresponding to the number of rotations of the small rotor 20 is generated from the generator 30. .

  Hereinafter, a method for controlling the power generation output of the rotating electrical machine 100 will be described.

  FIG. 6 is a diagram illustrating an example of the configuration of the power generation control system provided in the rotating electrical machine 100.

  In FIG. 6, the upper power generation control unit 40 calculates and transmits the power generation output command to the individual power generation control units 41 to 4N based on the total power generation output command of the power generation control system.

  The individual power generation control units 41 to 4N control the converters 51 to 5N that drive the generators 301 to 30N based on the power generation output commands 1 to N.

  The generators 301 to 30N are controlled in voltage and current by the converters 51 to 5N, and output torque corresponding to the output.

  Each of the small rotors 201 to 20N includes generators 301 to 30N on the inner peripheral side, and is magnetically coupled to the large rotor 10 via a magnetic gear.

  FIG. 7 is a block diagram illustrating an example of a functional configuration of the upper power generation control unit 40.

  In FIG. 7, the total power generation output calculation unit 61 determines the total power generation output based on the wind speed, the pitch angle (blade inclination), and the like. The total power output calculation unit 61 may be mounted on a higher-level control unit (for example, a wind farm controller) of the upper power generation control unit 40. In this case, the input to the upper power generation control unit 40 is the total power output. Become.

  The individual power generation output calculation unit 62 calculates the power generation output of each of the generators 301 to 30N based on the total power generation output, and sends each to the individual generators 301 to 30N as generator output commands 1 to N.

  FIG. 8 is a diagram illustrating an example of a configuration related to the individual power generation control unit 41, the converter 51, and the generator 301.

  In FIG. 8, the voltage sensor 71 measures and outputs the DC bus voltage of the converter 51. The current sensor 72 measures and outputs the generator current.

  FIG. 9 is a block diagram illustrating an example of a functional configuration of the individual power generation control unit 41.

In FIG. 9, the generator torque command calculation unit 81 calculates a generator torque command T ^ref from the generator output command P ^ref and the generator rotation speed ω by calculation such as Expression (1).

T ^ref = P ^ref / ω (1)
The generator rotation speed ω can be calculated by, for example, differentiating the rotation angle measured by the rotation angle sensor.

Further, the current command calculation unit 82 determines a current command for the corresponding generator based on the generator torque command T ^ref . The current command is generally expressed by a current amplitude I ^ref current phase θ ^ref , but there may be a case where only the current amplitude I ^ref is determined according to the generator torque command T ^ref with the current phase as a fixed value. is there. As an example, represented by the torque coefficient K _t as in Equation (2).

I ^ref = K _t T ^ref (2)
The current control unit 83 calculates a voltage command V ^ref from the current command I ^ref and the generator current response I ^res . Since the generator current response I ^res and the voltage command V ^ref are generally a three-phase AC amount, and the current command I ^ref is a DC amount, conversion such as dq / 3-phase conversion is performed as necessary. Often used.

The converter drive command calculation unit 84 performs PWM modulation on the voltage command V ^ref and generates a converter drive signal that is a switching signal for a power element built in the converter.

  Thereby, the converter 51 of FIG. 8 performs AC / DC conversion by switching of a power element between a DC bus and a generator side AC line.

  In the power generation control system configured as described above, the power generation output with respect to the wind speed is generally determined according to the wind speed as shown in FIG. The determination method may use a table of wind speed versus output value (correspondence table data), or may be determined by numerical calculation.

At this time, the maximum output W _GMAX of the power generation control device is the sum when all the individual generators are controlled with the maximum output W _mx , and is expressed by Expression (3).

W _GMAX = ΣW _mx (3)
Where x = 1, 2, 3,..., N (where N = the number of generators)
The individual power generation output calculation unit 62 sets the individual power generator output command W _gx ^ref = W _mx when the total power output command W _G ^ref = W _GMAX , but the individual power generator output when W _G ^ref <W _GMAX The command distribution method is important from the viewpoint of device cost and power generation efficiency.

Therefore, in this embodiment, it determines the power output coefficient K _P as in Equation (4).

K _P = W _G ^ref / W _GMAX (4)
Using the power generation output coefficient K _P , the individual generator output command is uniformly determined as shown in Expression (5).

W _gx ^ref = K _P W _mx (5)
Since W _mx is a value determined at the time of design of the generator and is a device-specific value, by determining in this way, the power generation output coefficient K _{P can be} individually calculated by a very simple calculation as shown in Equation (4) and Equation (5). A generator output command can be determined.

  That is, when the total power generation output command indicates a value of P% (however, 0% <P <100%) with respect to the maximum output, the individual power generation output calculation unit 62 determines that the individual power generation output command for each generator is It is set so as to indicate a value of P% with respect to the maximum output of each generator uniformly.

  For example, as shown in FIG. 11, when there are ten generators and the total power generation output command indicates a value of 70% with respect to the maximum output, the individual power generation output calculation unit 62 is configured for each individual power generator. The generator output command is uniformly set to indicate a value of 70% with respect to the maximum output of each generator.

  According to the first embodiment, the individual power generation output calculation unit 62 can employ an inexpensive arithmetic unit as the arithmetic device for calculating the individual generator output command value, thereby reducing the device cost and the calculation time. Such an effect can be obtained.

(Second Embodiment)
Next, the second embodiment will be described with reference to FIG. 12 while referring to FIG. 1 to FIG.

In the present embodiment, when W _G ^ref <W _GMAX , the individual generator output command value in the individual power output calculator 62 is determined as follows.

First, based on the maximum output W _mx of each generator, the number of generators driven n (n is an integer) is determined so as to satisfy the equation (6).

nW _mx ≦ W _G ^ref <(n + 1) W _mx (6)
n is the maximum value that the total output does not exceed W _G ^ref when all n generators to be driven are driven with the maximum output W _mx . By following equation (6), as many generators as possible are driven at maximum power.

Furthermore, the number of generators driven q (q is an integer) at which power generation is suspended, that is, the power generation output command W _gx ^ref = 0 is determined as in Expression (7).

q = N−n−1 (7)
By deciding as in equation (7), all but one generator driven by the maximum output will be operated with the power generation output command W _gx ^ref = 0, and as many as possible The generator can be shut down.

  When the generator output command is determined as described above, the power generation output command is determined for the remaining one as shown in Expression (8).

W _gx ^ref = W _G ^ref −nW _mx (8)
By determining the individual generator output command values as described above, the total power output, which is the sum of the power generation output command values, can be set to W _G ^ref according to the command value, and as many generators as possible can be used. It can be driven at the maximum output and can stop the generation of as many generators as possible.

  That is, when the total power output command indicates a given value of less than 100% with respect to the maximum output, the individual power output calculation unit 62 determines that the individual power generator output command for each generator The maximum output value is shown for as many units as possible without exceeding the value of, the output value for stopping as many units as possible for the generators that are not set to the maximum output, and the remaining The generator is set to show an output value such that the total output becomes the given value.

  For example, as shown in FIG. 12, when the total number of generators is 10 and the total power generation output command indicates a value of 75% with respect to the maximum output, the individual power generation output calculating unit 62 The generator output command indicates the maximum output value for 7 units, 0% output value for stopping 2 units, and 50% output value for the remaining 1 generator. Set as follows.

  In general, generators are often designed to be efficient at maximum output. Further, when the power generation output ≠ 0, that is, during the power generation operation, a loss occurs in both the generator and the converter due to the current of the generator, leading to deterioration in efficiency. However, by configuring as in the second embodiment, it is possible to set the power generation output = 0 with as many generators as possible and not only can suppress loss due to the generator current but also as many as possible. With this generator, it is possible to drive at the maximum output with high efficiency, and it is possible to obtain an effect that the generation of loss can be suppressed as much as possible.

(Third embodiment)
Next, a third embodiment will be described with reference to FIG. 13 while referring to FIG. 1 to FIG.

In the present embodiment, when W _G ^ref <W _GMAX , the individual generator output command value in the individual power output calculator 62 is determined as follows.

First, based on the output W _ex that gives the highest efficiency in each generator, the number of generators driven n (n is an integer) is determined so as to satisfy Equation (9).

nW _ex ≦ W _G ^ref <(n + 1) W _ex (9)
n is the maximum value that the total output does not exceed W _G ^ref when all the n generators are driven with the maximum efficiency output W _ex . By following equation (9), as many generators as possible will be driven at the highest efficiency output.

Here, when N-1 ≦ n, it means that the total output is less than W _G ^ref if there is even one generator that stops power generation. Therefore, p satisfying the formula (10) is determined by driving p out of N units with the maximum output,
(N−p) W _ex + pW _mx ≦ W _G ^ref <(n−p−1) W _ex + (p + 1) W _mx
(10)
Assuming that n ′ = n−p−1, there are n ′ generators driven at the maximum efficiency output, p generators driven at the maximum output, and the remaining one output command is determined as in Expression (11). .

W _gx ^ref = W _G ^ref −n′W _ex −pW _mx (11)
Note that the above case includes the case of p = 0.

  In the case of n <N−1, the number of generators q to be stopped (q is an integer) is determined according to the equation (7) as in the second embodiment, and the remaining generator output command is expressed by the equation (12). )

W _gx ^ref = W _G ^ref −nW _ex (12)
By determining the individual generator output command values as described above, the total power output, which is the sum of the power generation output command values, can be set to W _G ^ref according to the command value, and as many generators as possible can be used. It can be driven with the highest efficiency output and can stop the power generation of as many generators as possible.

  That is, when the total power output command indicates a given value of less than 100% with respect to the maximum output, the individual power output calculation unit 62 determines that the individual power generator output command for each generator Shows the output value that maximizes the power conversion efficiency of each generator as much as possible without exceeding the value of, and stops other generators as many as possible The output value is set, and the remaining generators are set so as to show the output value so that the total output becomes the given value.

  For example, as shown in FIG. 13, when the total number of generators is 10 and the total power generation output command indicates a value of 65% with respect to the maximum output, the individual power generation output calculating unit 62 The generator output command indicates 90% output value for which the power conversion efficiency of each generator is the highest efficiency for 7 units, 0% output value for stopping only 2 units, and the remaining power generation For one machine, it is set to show an output value of 20%.

  In general, the generator may not have the highest output = the maximum output. In such a design, the total power generation efficiency is not always optimal in the configuration of the second embodiment. However, by configuring as in the third embodiment, the generator output can be set to 0 with as many generators as possible, and not only can the loss due to the generator current be suppressed, but also as many as possible. With this generator, it is possible to drive at the output with the highest efficiency, and it is possible to obtain an effect that the generation of loss can be suppressed as much as possible.

  In addition, as the concept of efficiency described in the present embodiment, it is possible to employ the efficiency of a single generator or the total efficiency of the generator and the converter. It can be said that it is desirable to adopt the latter when the efficiency of the converter alone is relatively worse than the efficiency of the generator alone.

(Fourth embodiment)
Next, a fourth embodiment will be described with reference to FIGS. 1 to 10 and FIG.

In the present embodiment, when W _G ^ref <W _G ^MAX , the individual generator output command value in the individual power output calculator 62 is determined as follows.

First, the efficiency of the generator can generally be represented by a map as shown in FIG. In the configurations described in the second and third embodiments, the generation of loss is suppressed as much as possible by increasing the number of generators driven at the maximum output or the maximum efficiency output as much as possible. In order to output the power generation output command W _G ^ref , the output command is calculated within the range of 0 to 100% for adjustment, so that it does not become the output command of maximum output, maximum efficiency output, or zero output (power generation stoppage) There is only one machine. At this time, if the efficiency of this one unit is significantly lower than the efficiency at the maximum output or the maximum efficiency, this one unit will deteriorate the overall efficiency, and the generation of loss will not be reduced as much as possible. There is a case.

  Therefore, in this embodiment, a storage medium for storing a data group in which the generator efficiency map is tabulated as shown in FIG. 14 is provided, and the efficiency value is referred to from this data group so that the total power generation efficiency is maximized. Determine the generator output command value.

As the determination method, for example, after determining the number of generators to be stopped by the determination method of the third embodiment, the total output and the output command value when all the n generators to be driven are operated at the highest efficiency output Is calculated as shown in Equation (13),
ΔW = W _G ^ref −nW _ex (13)
Each power generation output command value is determined as shown in Equation (14).

W _gx ^ref = W _ex + ΔW / n (14)
That is, when the total power generation output command indicates an output value less than 100% with respect to the maximum output, the individual power generation output calculation unit 62 determines that the individual power generation output command for each generator is the total power generation based on the data group. Set the output value to maximize efficiency.

  By deciding as in equation (14), the individual generator output command to be driven becomes an output value that is uniformly deviated from the maximum efficiency output by ΔW / n, but as can be seen from the generator efficiency map of FIG. As the output value is further away from the maximum efficiency point, the efficiency is deteriorated. Therefore, it is possible to prevent the efficiency of only one unit from being significantly reduced, and the effect that the loss reduction can be suppressed as much as possible can be obtained.

  As another method, for example, it is also possible to calculate the total efficiency while changing the individual generator output command little by little by repeatedly performing calculation, and determine the generator output command so that this is the highest. In this case, the calculation algorithm may be complicated, but the loss can be further reduced as compared with the method determined as in Expression (14).

(Fifth embodiment)
Next, a fifth embodiment will be described with reference to FIGS. 1 to 10 and FIG.

  Although the total power generation efficiency can be improved with a simple configuration by the methods described in the second, third, and fourth embodiments, from the viewpoint of a failure interval MTBF (Mean Time Before Failure) between the generator and the converter. In some cases, it is better to select a generator that stops power generation or a generator that adjusts the amount of power generation.

  FIG. 15 shows the configuration of the upper power generation control unit 40 in the present embodiment.

  The operating state quantity calculator 61 calculates an operating state quantity that affects the failure frequency of the generator. In FIG. 15, the generator output command is input, and the accumulated operating time of the generator and the accumulated power generation amount are calculated. This is because MTBF, which is one of the measures representing the failure frequency, often depends on these values.

  The individual power generation output calculation unit 62 selects a generator to be stopped or a generator for adjusting the output from these operating state quantities. For example, when using the cumulative operating time, if there is a generator with a cumulative operating time higher than the average cumulative operating time of all the generators, the generator is selected to be stopped.

  In addition, when using the accumulated power generation amount, if there is a generator having a higher accumulated power generation amount than the average accumulated power generation amount of all the generators, the generator is selected to be stopped or to reduce the output.

  According to the fifth embodiment, the failure intervals of the generators and converters can be made uniform as much as possible, the maintenance interval is extended, the maintenance efficiency is improved, the operation time of the power generator is increased, and the total power generation amount It is possible to obtain an effect such as an increase in.

  As described above in detail, according to each embodiment, it is possible to improve the power generation efficiency in the rotating electrical machine.

  Although several embodiments of the present invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

  DESCRIPTION OF SYMBOLS 1 ... Nacelle, 2 ... Windmill blade, 2A ... Blade axis | shaft (blade shaft), 2B ... Windmill blade main body, 3 ... Tower, 5a, 5b ... Permanent magnet, 10 ... Large rotor, 11 ... Rotating shaft, 12 ... Support member, 20, 201 to 20N ... small rotor, 21 ... shaft, 30, 301 to 30N ... generator, 40 ... upper power generation control unit, 41-4N ... individual power generation control unit, 51-5N ... converter, 61 ... total power generation output Calculation part 62 ... Individual power generation output calculation part 71 ... Voltage sensor 72 ... Current sensor 100 ... Rotating electric machine 101 ... Power conversion part C ... Cable, G ... Gap.

Claims (7)

A plurality of second rotors are arranged around the first rotor so as to be magnetically coupled to the first rotor, and are accelerated according to the rotation of the first rotor. In a control device for a rotating electrical machine having a rotor and a plurality of generators that are arranged on the inner peripheral side of the plurality of second rotors and generate electric power according to the number of rotations of the second rotor,
When the total power output command indicates a value of P% (where 0% <P <100%) with respect to the maximum output, the individual generator output command for each generator is uniformly applied to the maximum output of each generator. A control device for a rotating electrical machine, comprising means for setting to indicate a value of P%. A plurality of second rotors are arranged around the first rotor so as to be magnetically coupled to the first rotor, and are accelerated according to the rotation of the first rotor. In a control device for a rotating electrical machine having a rotor and a plurality of generators that are arranged on the inner peripheral side of the plurality of second rotors and generate electric power according to the number of rotations of the second rotor,
When the total power output command indicates a given value of less than 100% with respect to the maximum output, the individual generator output command for each generator is as far as possible within the range where the total output does not exceed the given value. The output value of the maximum output is shown for many units, the output value for stopping as many units as possible is shown for generators that are not set to the maximum output, and the total output is given for the remaining generators. A control device for a rotating electrical machine comprising means for setting an output value to be a value of A plurality of second rotors are arranged around the first rotor so as to be magnetically coupled to the first rotor, and are accelerated according to the rotation of the first rotor. In a control device for a rotating electrical machine having a rotor and a plurality of generators that are arranged on the inner peripheral side of the plurality of second rotors and generate electric power according to the number of rotations of the second rotor,
When the total power output command indicates a given value of less than 100% with respect to the maximum output, the individual generator output command for each generator is as far as possible within the range where the total output does not exceed the given value. For many generators, the output value at which the power conversion efficiency of each generator is the highest efficiency is shown. For other generators, output values for stopping as many as possible are shown, and the remaining power generation A control device for a rotating electrical machine, characterized in that it comprises means for setting an output value such that the total output becomes the given value. A plurality of second rotors are arranged around the first rotor so as to be magnetically coupled to the first rotor, and are accelerated according to the rotation of the first rotor. In a control device for a rotating electrical machine having a rotor and a plurality of generators that are arranged on the inner peripheral side of the plurality of second rotors and generate electric power according to the number of rotations of the second rotor,
Efficiency information storage means for storing information indicating the relationship between the power generation efficiency of each generator and the operating conditions;
When the total power generation output command indicates an output value of less than 100% with respect to the maximum output, the individual power generator output command for each generator is based on the information stored in the efficiency information storage means, and the total power generation efficiency is maximum. A control device for a rotating electrical machine, comprising: a setting unit configured to set an output value such that A plurality of second rotors are arranged around the first rotor so as to be magnetically coupled to the first rotor, and are accelerated according to the rotation of the first rotor. In a control device for a rotating electrical machine having a rotor and a plurality of generators that are arranged on the inner peripheral side of the plurality of second rotors and generate electric power according to the number of rotations of the second rotor,
An operating state quantity measuring means for measuring an operating state quantity that influences the frequency of failure of each generator;
Means for setting the generator to stop the output or select the generator that reduces the output amount so that the operating state quantity of each generator measured by the operating state quantity measuring means is as uniform as possible. A control device for a rotating electrical machine.   A rotating electrical machine comprising the control device according to any one of claims 1 to 5.   A wind power generation system that generates electric power from wind power using the rotating electrical machine according to claim 6.

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