JPH0834717B2 - Variable speed winding type induction machine controller - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to a variable speed winding type winding machine using a winding type induction machine that can be rotated by a water turbine and an AC exciter connected to the secondary winding side of this induction machine. The present invention relates to an induction machine control device, and more particularly to a variable speed winding type induction machine control device that can smoothly control the rotation output and the power generation output of the induction machine even when the input signal related to the power generation output changes significantly.

[Conventional technology]

One of the main purposes for controlling the speed of a rotating electric machine
The first was to control the rotation speed according to the load of the turbomachine such as a pump turbine to realize the operation of the turbomachine at the highest efficiency. The method of operating the water turbine for the turbine power generator at a variable speed can be roughly classified into two types.

The first is a method of providing a frequency converter between the AC system and the generator. JP-A-48-21045 allows power to be supplied to the AC system even when the generator is operated at an arbitrary rotation speed.
A method has been proposed in which the rotation speed is adjusted by opening and closing the guide valve of a water turbine to realize operation at the maximum efficiency point of the water turbine.

The second is to connect the primary side of the wire wound induction machine to the AC system.
This is a method of providing a frequency converter between the secondary side and the AC system. This method is a typical application of the method in which the primary side of a wound-type induction machine is connected to an AC system and a frequency converter is installed between the secondary side and the AC system to control the rotation speed according to the generator output. Has been known for a long time, and is also described in the Electrical Engineering Handbook (published by The Institute of Electrical Engineers of Japan, 1972 edition). As a control device for a variable speed turbine generator of this type, for example, Japanese Patent Laid-Open No.
-46428, Japanese Patent Application No. 57-182920, and Japanese Patent Application Laid-Open No. 55-56499 are proposed.

The problem common to the two types of variable speed turbine generators is how to control the turbine speed and the generator output to control the rotation speed. Specifically, what is the speed deviation signal (Na-N) that compares the optimum rotation speed command value Na calculated from a signal including at least the power generation output command signal Po from the outside that indicates the turbine operating condition and the rotation speed detection value N Another issue is whether to use it for output control of a water turbine and a generator. Because, when adjusting the rotation speed with a mechanically connected turbine and generator, the fluid kinetic energy of the water channel system is smaller than the rotational kinetic energy of the mechanical system, and the loss of the generator is generally negligible. This is because the difference between the turbine output and the generator output almost increases or decreases the rotational kinetic energy. Here, the power generation output command Po from the outside is the power generation output calculated from the measurement signals of the voltage, current, frequency, phase, rotation speed, etc. of the devices that make up the variable speed power generator such as the water turbine, generator, frequency converter, etc. It means a power generation output command other than the command. Specifically, it means a power generation output command from the outside of the power generation device such as a central power supply command station.

Japanese Patent Application Laid-Open No. 55-56499 cited as a method for connecting a primary side of a wire wound type induction machine to an AC system and providing a frequency converter between the secondary side and the AC system in an induction machine control device for variable speed turbine power generation. No. 3 proposes a configuration in which three types of measurement signals, that is, the speed of the driving medium (flow rate in the case of a turbine), rotation speed, and generator stator output, are used for generator output control and turbine output control. However, there is no specific proposal on how to control the generator output and the turbine output to control the rotation speed. Further, there is no specific proposal as to how to make the generator output respond to the power generation output command Po from the outside.

Japanese Patent Application Laid-Open No. 52-46428 and Japanese Patent Application No. 57-1, which are cited as proposals for an induction machine control device relating to this type of variable speed turbine power generation.
No. 82920 proposes a control method that controls the generator output using the rotation speed deviation signal.

FIG. 9 shows an example of the configuration of the induction machine control device relating to these variable speed turbine power generation. In FIG. 9, reference numeral 1 denotes an induction machine, which is rotationally driven by a water turbine 2 directly connected to its rotor, and a secondary excitation controller 3 having a secondary converter 1b of the induction machine 1 provided with a frequency converter. AC exciting current adjusted to a predetermined phase according to the rotation speed of 1 is supplied, and variable speed so that AC power of the same frequency as the AC system 4 is output from the primary winding 1a of the induction machine 1. Driving is performed. Reference numeral 5 is a turbine characteristic function generator, which is an external power generation output command Po
And a water level detection signal H are input to generate an optimum rotation speed command Na and an optimum guide valve opening command Ya for operating at maximum efficiency.
A slip phase detector 7 detects a slip phase Sp which is equal to the difference between the voltage phase of the AC system 4 and the secondary side rotational phase of the induction machine expressed in electrical angle. A configuration example of the slip phase detector 7 will be described. The rotor of the slip phase detector is provided with a three-phase winding connected in parallel to the primary winding 1a of the induction machine 1, and the stator side of the slip phase detector 7 has an electrical angle of π.
A Hall converter is provided at a position different from each other by / 2, and a signal in which the voltage phase of the AC system 4 seen from the secondary side of the induction machine 1 matches is detected by the Hall converter and converted into a slip phase Sp. It An induction machine output command device 8 generates an induction machine output command PG by comparing the optimum rotation speed command Na from the water turbine characteristic function generator 5 and the rotation speed detection signal N from the rotation speed detector 6. This induction machine output command PG and the slip phase signal Sp of the slip phase detector 7
Is input to the secondary excitation control device 3 and the output detection signal P of the induction machine 1 detected by the active power detector 9 is an induction machine output command.
The AC exciting current supplied to the secondary winding 1b of the induction machine 1 is controlled so as to be equal to PG. Specifically, Japanese Patent Publication 57-60645
The control method proposed in the issue can be applied. The guide valve driving device 10 corrects the opening of the guide valve 11 as the water amount supply means according to the optimum guide valve opening command Ya which is the supply water amount signal from the water wheel characteristic function generator 5, and thereby the guide valve 11
It controls the turbine output PT by correcting the amount of water supplied by.

In such a control device, when the power generation output command Po, which is about to increase the power generation output P stepwise, is changed as shown in FIG. 10 (a), the power generation output command Po increases stepwise. Along with this, the optimum rotation speed command Na and the optimum guide valve opening command Ya also rise in steps as shown in FIGS. 10 (b) and 10 (c), and the opening Y of the guide valve 11 is set to the guide valve drive unit 10.
As a result, as shown in FIG. 10 (d), the control is sequentially performed so as to match the guide valve opening command Ya, and the turbine output PT is also shown in FIG. 10 (e) as the opening Y of the guide valve changes. And changes to a value corresponding to the power generation output command Po. On the other hand, in order to increase the rotation speed N of the induction machine 1 to match the optimum rotation speed command Na as shown in FIG. 10 (f), the kinetic energy of the rotating system of the power generator corresponding to the increase is required. Need to increase. The only way to compensate for this increase in kinetic energy is to increase the turbine output PT or the power generation output P. However, as described above, the guide valve that changes according to the optimum guide valve opening command Ya
The turbine output PT does not increase immediately because the turbine output PT is determined by the opening Y of 11. For this reason, the kinetic energy increase is supplied to the rotating system by reducing the power generation output P, and as shown in FIG. Problems occur in the operation of the grid. In order to prevent the transient decrease in the power generation output P, the optimum rotation speed command Na from the water wheel characteristic function generator 5 is provided inside the induction machine output command device 8 to suppress a sudden change in the signal such as a first-order lag element. A method of generating the induction machine output command PG by comparing the output of this device and the rotation speed detection signal N from the rotation speed detector 6 after inputting is conceivable. By this method, a part of the increase in the turbine output PT can be supplied to the increase in the rotational kinetic energy, and the rest can be distributed to the increase in the output P of the induction machine 1. However, even with this method, the output P of the induction machine 1 cannot be increased faster than the increase of the turbine output PT, and there is a drawback that the response speed of the power generator is suppressed by the response of the guide valve drive device 10. This problem also occurs when trying to lower the power generation output command Po stepwise. These problems are basically caused by controlling only the output of the induction machine 1 to control the rotation speed N.

The problems of the prior art regarding the output control and the rotation speed control of the induction machine control device regarding the variable speed turbine power generation have been described above. Next, the problem when the frequency control of the AC system is performed by the induction machine control device relating to the variable speed turbine power generation will be described.

A feature of a power generator that performs a variable operation by providing a secondary excitation control device having a frequency converter between the secondary side of the induction machine and the AC system is that the rotational speed and the frequency of the AC system do not match. In response to this point, Japanese Patent Application No. 58-199041 has been proposed as a method for controlling the frequency of the AC system to a predetermined value. In this proposal, it is necessary to control the power generation output to the AC system in order to control the frequency, but on the other hand, in order to keep the rotation speed at an optimum value, the turbine must supply an output corresponding to the change in the power generation output. The focus is on the point.
An example of the structure of this proposal is shown in FIG. In FIG. 11, the items having the same numbers as those in FIG. 9 are the same items. Here, only the part of FIG. 11 different from that of FIG. 9 will be described.

Reference numeral 13 is a frequency detector for detecting the frequency f of the AC system 4. Reference numeral 14 is a frequency control device for comparing the frequency detection signal f with a frequency setting value to calculate a power generation output command correction signal ΔPo.
Consider a case where the power generation output command correction signal ΔPo rises stepwise and the input to the turbine characteristic function generator 5 rises stepwise. In this case, the response of the output P of the induction machine 1 shows exactly the same change as in FIG. 10 (g). Therefore, the frequency control, which is the initial purpose, has a problem that the output P of the induction machine 1 does not respond in response to the change in the power generation output command correction signal ΔPo and the frequency deviation is transiently increased.

Thus, in the conventional induction motor control device for variable speed turbine power generation, when changing the power generation output state of the induction machine, the target rotation speed signal is compared with the actual rotation signal of the induction machine, and the AC Although the output of the exciter is adjusted to change the rotation output of the induction machine, the output of the turbine is not changed rapidly, so it operates to increase or decrease the power generation output for the fluctuation of the kinetic energy. As a result, there has been a problem that the power generation output of the induction machine is transiently projected or dropped and does not change smoothly with respect to the target signal.

[Problems to be Solved by the Invention]

An object of the present invention is to provide a variable speed winding type induction machine control device capable of controlling so that the rotation output and the generation output of the induction machine can be smoothly changed even when the input signal related to the generation output is greatly changed. is there.

[Means for solving the problem]

In order to achieve the above object, the present invention comprises a target rotation speed signal generating means for inputting a power generation output command signal and outputting a target rotation speed signal of a wire wound induction machine, and also a rotation signal and a target of the wire wound induction machine. A rotation speed signal is input to input the AC excitation output correction means that corrects the AC excitation output of the AC excitation device, the rotation signal of the wire-wound induction machine and the target rotation speed signal, and the amount of water supplied to the water amount supply means. And a supply water amount correction signal output means for outputting a supply water amount correction signal for correcting

[Action]

According to the present invention, the target rotation speed signal of the induction machine and the actual rotation speed signal are input to quickly correct the AC excitation output of the AC excitation device, and the target rotation speed of the induction machine is also used for the amount of water supplied to the water turbine. Since the signal and the actual rotation speed signal are input to quickly correct the water amount, even if the input signal related to the power generation output changes significantly, the AC water supply output and the supplied water amount are increased / decreased as soon as possible. Therefore, the rotation output and the power generation output of the induction machine can be controlled so as to change smoothly.

Example of Invention

FIG. 1 shows an example of a variable speed winding type induction machine control device which has been recently considered, and the components having the same numbers as those in FIG. 9 used for explaining the conventional example show the same products. Here, parts of FIG. 1 different from those of FIG. 9 will be described in detail, and description of common parts will be omitted. A rotation speed command calculator 15 generates an optimum rotation speed command Na according to a power generation output command Po from the outside and a water level signal H from the outside. In the case of a power generator with little fluctuation in water level, the optimum rotation speed command Na may be generated only from the power generation output command Po without inputting the water level signal H. Reference numeral 16 denotes a rotation speed control device which compares the optimum rotation command Na with the rotation speed signal N detected by the rotation speed detector 6 and outputs a guide valve opening command signal Ya which is a supply water amount signal. The guide valve driving device 10 inputs this signal and corrects the opening degree of the guide valve 11, thereby correcting the amount of water supplied by the guide valve 11 and controlling the turbine output PT.

FIG. 2 shows an embodiment of the rotation speed control device 16. Reference numeral 17 is a comparator which outputs the rotational speed deviation ΔN. This rotation speed deviation ΔN is input to 18 comparison elements K1 and 19 integration elements (K2 / S), and their outputs are added by the adder 20 to the guide valve opening command Ya.
Is input to the guide valve drive device 10.

On the other hand, a power generation output command Po from the outside is input to the rotation speed command calculator 15 and also as a power generation output command to the secondary excitation control device 3.

In the control device of the present embodiment configured as described above, the power generation output command Po is increased stepwise as shown in FIG. 3A in order to increase the power generation output P stepwise at time t0. And the power generation output P of the induction machine 1 increases following the change of the power generation output command Po as shown in FIG. 3 (g). On the other hand, the guide valve opening command Ya is the optimum rotation speed command Na
Rises in a step manner as shown in FIG. 3 (c), and therefore changes in a step manner as shown in FIG. 3 (b) due to an output change of the proportional element 18. However, the response of the opening degree Y of the guide valve 11 is slower than the response speed of the induction machine output P to the above-described power generation output command Po. Therefore, the turbine output PT becomes smaller than the induction machine output P, and the rotation speed N is temporarily decelerated after the sudden change in the power generation output command Po. Then, at time t1, the power generation output P and the turbine output PT become equal and the rotation speed N Is minimal. Since the speed deviation ΔN is positive at the time point t1, the guide valve opening command Ya continues to rise by the integrating element 19. The guide valve opening Y continues to increase, and at time t2, the rotation speed N becomes equal to the optimum rotation speed command Na, and the guide valve opening Ya becomes maximum. Then, the guide valve opening Y and the rotation speed N are damped and oscillated, and the rotation speed N is settled to the optimum rotation speed command Na. The turbine output PT and the power generation output P are equal at the times t3 and t5 in FIG. 3, and the rotation speed N and the optimum rotation speed command Na are equal at the time t4.

From the above, it is possible to make the power generation output P follow the change of the power generation output command Po faster than the response of the guide valve 11 and settle the rotation speed N to the optimum rotation speed Na. This uses rotational kinetic energy first in order to make the power generation output P follow the change of the power generation output command Po, and keeps the output P of the induction machine 1 at the power generation output command Po while rotating the optimum rotation speed command Na to the rotation speed. Rotational kinetic energy required to adjust N is guide valve 11
It is realized by controlling and supplying.

However, in this device example, since the opening control of the guide valve 11 is not rapidly performed with respect to the power generation output command Po, the turbine output PT does not change quickly, but the power generation output P is changed to the power generation output command Po. There is a problem in that the target signal that follows quickly is not smoothly changed because of the target signal that causes the rotational speed N to oscillate transiently.

Further, FIG. 4 is a diagram showing another example of a variable speed winding type induction machine control device which has been recently considered. Here, parts different from those in FIG. 1 will be described in detail, and description of common parts will be omitted. A water wheel characteristic function generator 5 generates an optimum guide valve opening command Ya and an optimum rotation speed command Na from an external power generation output command Po and a water level signal H. When the water level fluctuation is small, the water level signal H can be omitted. The rotation speed control device 16 outputs the guide valve opening correction signal ΔY with the same configuration as in FIG.
The optimum guide valve opening command Ya from the water wheel characteristic function generator 5 is configured to be urged by the adder 21 to the guide valve opening correction signal ΔY and input to the guide valve driving device 10.

In the control device of the present embodiment configured as described above, the power generation output command Po is increased stepwise as shown in FIG. 5 (a) in order to increase the power generation output P stepwise at time t0. Then, the power generation output P of the induction machine 1 follows the change of the power generation output command Po as shown in FIG. On the other hand, the response of the opening Y of the guide valve 11 to the optimum guide valve opening command Ya is slower than the response of the power generation output P to the power generation output command Po. Therefore, the turbine output rather than the power output P
Since PT becomes smaller, the rotation speed N is temporarily decelerated after the power generation output command Po suddenly changes, and at time t1, the power generation output P and the turbine output PT become equal and the rotation speed N becomes extremely small. Since the speed deviation ΔN is positive at this time t1, the guide valve opening correction signal Δ
Y is positive, and the guide valve opening degree Y further rises above the optimum guide valve opening degree instruction Ya. Therefore, the turbine output PT becomes larger than the power generation output P, and the rotation speed N begins to rise as shown in FIG. 5 (f). Then, as the rotation speed N increases, the optimum rotation speed command Na
The deviation between and decreases, the turbine output PT decreases with the decrease of the guide valve opening correction signal ΔY, and the acceleration of the rotation speed N decreases.

Using the embodiment of FIG. 4, the speed deviation ΔN in the steady state becomes zero by the integral element 19. On the other hand, the deviation between the optimum guide valve opening command Ya from the turbine characteristic function generator 5 and the guide valve opening Y corresponds to the error between the turbine characteristic stored in the turbine characteristic function generator 5 and the actual characteristic of the turbine 2. It can be made almost zero by increasing the precision of the turbine characteristic function. Therefore, it suffices that the integration element 19 generate only the guide valve opening deviation (Ya-Y) in the steady state. This is because in the embodiment of FIG. 1, all of the guide valve opening command Ya in the steady state are integrated elements.
In contrast, 19 must occur. As a result, in the embodiment shown in FIG. 1, the integral element is used to accelerate the response of the guide valve 11.
As a price that the gain K2 of 19 must be increased to some extent or more, as shown in Figs. 3 (e) and (f), the turbine output PT and the rotation speed N
Has a vibrational response to some extent. On the other hand, in the embodiment shown in FIG. 4, the response speed can be increased even if the gain K1 of the proportional element 18 having a braking effect is increased and the gain K2 of the integral element 19 is relatively decreased. Moreover, as shown in Fig. 5 (e) and (f), the turbine output
It is possible to settle without vibrating PT and rotation speed N.

However, in this device example as well, as in the device shown in FIG. 1 described above, since the opening control of the guide valve 11 is not performed quickly, the turbine output PT does not change quickly, but the power generation output P does not change. There is a problem that the output command po is quickly followed, and thus the rotation speed N transiently drops or rises.

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

FIG. 6 is a diagram showing an embodiment of the present invention. The configuration of this embodiment is a modification of the device configuration of FIG.
The parts different from the device configuration in FIG. 4 will be described in detail, and the description of the common parts will be omitted. A comparator 22 outputs a deviation ΔN between the optimum rotation speed command Na and the rotation speed detection value N. This rotation speed deviation ΔN is input to the power generation output correction command device 23, and the output signal ΔP1 of this power generation output correction command device 23 and the power generation output command signal Po from the outside are generated by the adder 24 and output to the secondary excitation control device 3. It is configured to be input as a command signal.

The configuration of the power generation output correction command device 23 will be described. When the absolute value of the rotation speed deviation ΔN is smaller than N1, the power generation output correction command signal ΔP1 maintains zero, and when it exceeds N1, the rotation speed deviation ΔN.
The absolute value of the power generation output correction command signal ΔP1 also increases in proportion to the increase of the absolute value of. The absolute value of this power generation output correction command signal ΔP1 is output so as not to exceed P1.

In the control device of the present embodiment configured as described above, the power generation output command Po is shown in FIG. 7 (a) in order to increase the power generation output P to a value near the maximum output of the water turbine in a ramp shape at the time point t0. The response when the lamp is raised like this will be described. First, for comparison and comparison, FIG. 8 shows the response when the power generation output command is increased like a ramp under the same conditions in the embodiment of FIG. When the power generation output command Po is ramped up from time t0 to t3 as shown in FIG. 8 (a), the optimum rotation speed command Na is the rating of the secondary excitation control device until time t1 as shown in FIG. 8 (c). It remains at the minimum rotation speed determined by the voltage. Up to time t1, the optimum guide valve opening command Ya and the guide valve opening y are almost equal as shown in FIG. 8 (b). From time t1, the optimum rotation speed command Na increases with the increase of the power generation output command Po,
Due to the deviation ΔN from the rotation speed N, the guide valve opening Y becomes larger than the optimum guide valve opening command Ya from the turbine characteristic function generator 5, and a part of the turbine output starts to be supplied as an increase in rotational kinetic energy. At time t2, the guide valve opening Y reaches the maximum value, and the turbine output PT becomes almost constant as shown in FIG. 8 (d).
In order to bring the rotation speed N close to the optimum rotation speed command Na, it is necessary to make the turbine output PT larger than the power generation output P to increase the rotational kinetic energy. However, as shown in FIGS. 8 (d) and 8 (e), from the time t3, the increase in the rotational kinetic energy becomes smaller as the final value of the power generation output command Po becomes larger, and the acceleration of the rotation speed N also becomes smaller. As a result, the rotation speed deviation ΔN becomes smaller and the time until the guide valve opening Y starts to settle to the optimum guide valve opening command Ya becomes longer until the rotation speed N settles to the optimum rotation speed command Na. It is not possible to operate the turbine 2 at the highest efficiency. In some cases, the efficiency decrease due to this cannot be ignored. On the other hand, the response of FIG. 7 is exactly the same as the response of FIG. 8 described above until the time t1. Optimal rotation speed command as shown in Fig. 7 (c)
The rotation speed deviation ΔN starts to increase from time t1 when Na starts to rise, and the rotation speed deviation ΔN reaches N1 set by the power generation output correction command device 23 at time t2. After the time point t2, the power generation output correction command device 23 generates a power generation output correction command ΔP1 in a direction of canceling the external power generation output command Po input to the secondary excitation control device 3. As a result, as shown in FIG. 7 (e), the power generation output P becomes lower than the power generation output command Po, and the acceleration of the rotation speed N increases as the difference between the turbine output PT and the power generation output P increases. At time t3, the guide valve opening Y becomes maximum,
The power generation output command Po reaches the maximum value at time t4. At time t5, the rotation speed deviation ΔN again decreases to N1 and the power generation output correction command signal ΔP1 becomes zero. At time t6, as the rotation speed N approaches the optimum rotation speed command Na, the guide valve opening Y starts to decrease and settles to the optimum guide valve opening Ya. As a result, from time t2 to time t5
By suppressing the power generation output P up to, the acceleration to the optimum rotation speed command value Na can be accelerated. INDUSTRIAL APPLICABILITY The present invention is effective when the power generation output command Po is greatly changed, and is particularly suitable for the control device of the variable speed turbine generator whose inertia moment in the rotating part is relatively large with respect to the power generation output rating.

FIG. 9 is a view showing another embodiment of the present invention, and this embodiment is a modification of the embodiment shown in FIG. Here, parts different from those in FIG. 4 will be described in detail, and description of common parts will be omitted. The rotation speed N detected by the rotation speed detector 6 is input to the power generation output correction command device 25, and the output signal ΔP2 of this power generation output correction command device 25 and the power generation output command signal Po from the outside are secondary through the adder 26. The excitation control device 3 is configured to be input as a power generation output command signal. The configuration of the power generation output correction command device 25 shown in FIG. 9 will be described. When the rotation speed N is between the set values N2 and N3, the power generation output correction command signal ΔP2 maintains zero, and when the rotation speed N becomes lower than the set value N2, the power generation output correction command signal Δ2 decreases the rotation speed N. It decreases in proportion. On the other hand, when the rotation speed N becomes higher than the set value N3, the power generation output correction command signal ΔP2 increases in proportion to the increase of the rotation speed N. This power generation output correction command signal ΔP2
The absolute value of is output so that it does not exceed P2. Set value N2 here
And N3 correspond to the voltage rating and frequency output range of the frequency conversion device that constitutes the secondary excitation control device 3, and the rotational speed range determined by the strength of the mechanical parts of the induction machine 1 and the water turbine 2. In the control device of the present embodiment configured as described above, the time t0
Now, the response when the power generation output command Po is increased stepwise as shown in FIG. 10 (a) in order to increase the power generation output P stepwise in the state where the rotation speed N is near the set value N2 will be described. When the power generation output command Po increases at the time point t0, the rotation speed N temporarily decreases as shown in FIG. 10 (f), contrary to the change of the optimum rotation speed command Na, as in the case of FIG. When the rotation speed N becomes lower than the set value N2, the power generation output command inputted to the secondary excitation control device 3 by the power generation output correction command ΔP2 becomes smaller than the power generation output command Po from the outside. Therefore, the time point t1 at which the turbine output PT and the power generation output P match is earlier than the time point t2 at which the turbine output PT matches the power generation output command Po. Therefore, when the present invention is carried out, the time point at which the rotation speed N becomes the minimum is the time point t2 as shown by the broken line in FIG. At the same time, it is possible to greatly reduce the transient overshoot in the opposite direction of the speed. INDUSTRIAL APPLICABILITY The present invention is effective for controlling the rotation speed within the rotation speed setting range of the variable speed turbine generator. Needless to say, this embodiment can be implemented in combination with the embodiment shown in FIG.

FIG. 11 is a view showing another embodiment of the present invention, and this embodiment is a modification of the embodiment shown in FIG. Here, parts different from those in FIG. 4 will be described in detail, and description of common parts will be omitted. Reference numeral 13 is a frequency detector for detecting the frequency f of the AC system 4, and 27 is a frequency control device for comparing the frequency detection signal f of the AC system 4 with the frequency setting value fo and outputting the power generation output correction command signal ΔP3. This power generation output correction command signal Δ
A configuration is adopted in which P3 is biased by the adder 28 to the power generation output command Po from the outside and is input to the water turbine characteristic function generator 5 and the secondary excitation control device 3. FIG. 12 is a diagram showing an embodiment of the frequency control device 27. A comparator 29 outputs a deviation Δf between the frequency set value fo and the frequency detection signal f. This frequency deviation Δ
f is input to 30 proportional elements K3 and 31 integral elements (K4 / S), and these outputs are input to the limiter 33 via the adder 32. The limiter 33 is configured to suppress the absolute value of the power generation output correction command signal ΔP3 to P3 or less. With such a configuration, the power generation output correction command signal ΔP3 calculated from the frequency deviation Δf can be used for adjusting both the hydraulic turbine guide valve drive device 10 and the secondary excitation control device 3, and frequency control and stable rotation speed control can be performed. Can be realized.

FIG. 13 is a view showing another embodiment of the present invention, and this embodiment is a modification of the embodiment shown in FIG. Here, parts different from those in FIG. 4 will be described in detail, and description of common parts will be omitted. Although there is no specific proposal for the processing method when the power generation output command from the outside of the variable speed turbine power generator is outside the power generation range of the power generator, FIG. 13 is a diagram showing an example of this processing method. . Reference numeral 34 denotes a power generation output limiting calculator which suppresses the output to P5 when the power generation output command signal Po from the outside exceeds a set value P5 and suppresses the output to P4 when the power generation output command signal Po is smaller than the set value P4. And the input to the water wheel characteristic function generator 5.

FIG. 14 is a diagram showing another embodiment obtained by modifying the embodiment shown in FIG. Reference numeral 35 denotes a power generation output limit calculator, which is configured to suppress the power generation output command Po within a range determined by the set values P4 and P5, like the power generation output limit calculator 34 described above. However, in the power generation output limit calculator 35, the set values P4 and P5 are input from the power generation limit function generator 36. The power generation limit function generator 36 receives the water level signal H and receives the power generation output upper limit value P5 and lower limit value P4.
Occurs. The upper and lower limits P4 and P5 are determined by the hydraulic characteristics of the water turbine 2, the output limit of the induction machine 1, the voltage output limit of the secondary excitation control device 3, the output frequency range, and the like. According to this embodiment, it is possible to prevent overload of the variable speed turbine generator with large fluctuations in water level.

FIG. 15 is a diagram showing another embodiment obtained by modifying the embodiment shown in FIG. The power generation output limiting calculators 341 and 342 have the same configuration as the above-described power generation output limiting calculator 34. The power generation output limiting calculator 341 is installed between the adder 28 for frequency control and the power generation output command input of the turbine characteristic function generator 5, and the power generation output limiting calculator 342 is the adder 26 for adjusting the rotation speed. The secondary excitation control device 3 is arranged between the power generation output command inputs. According to the present embodiment, overload prevention can be realized even when the output command to the water turbine and the induction machine is corrected for frequency control and rotation speed adjustment.

〔The invention's effect〕

According to the present invention, the target rotation speed signal and the actual rotation signal of the induction machine are input to adjust the output of the AC exciter, and the target rotation speed signal and the actual rotation speed signal with respect to the amount of water supplied are also adjusted. Since a means for inputting and correcting the rotation signal of the induction machine is provided, even if, for example, the signal related to the power generation output input to the wire wound induction machine changes significantly, the rotation output and the power generation output of the induction machine are transient. Since it is possible to quickly adjust the output of the AC exciter and the amount of water supplied to the water turbine so as to prevent the rise and fall of the induction machine, the rotation output of the induction machine and the power generation output can be adjusted smoothly within a range that can be adjusted as much as possible. The effect is that it can be changed quickly.

[Brief description of drawings]

FIG. 1 is a block diagram of a variable speed winding type induction machine control device which has been recently considered, FIG. 2 is a block diagram of an embodiment of a rotation speed control device forming a part of FIG. 1, and FIG. a) ~
(G) is a waveform diagram of a signal in each part of the control device,
The figure is a block diagram of another example of the variable speed induction machine control device which has been recently considered, FIGS. 5 (a) to 5 (g) are waveform diagrams of signals in each part of the control device, and FIG. 7 is a block diagram of a variable speed winding type induction machine control device according to an embodiment of the invention;
8 (a) to 8 (e) are waveform diagrams of signals in respective parts of the control device, and FIGS. 8 (a) to 8 (e) are signals in respective parts of the control device of FIG. 4 for comparison with FIG. Waveform diagram of No.9
FIG. 10 is a block diagram of a variable speed induction machine control device according to another embodiment of the present invention, FIGS. 10 (a) to 10 (g) are waveform diagrams of signals in respective parts of the control device, and FIG. 12 is a block diagram of a variable speed winding type induction machine control device according to another embodiment of the invention.
FIG. 11 is a block diagram according to an embodiment of a frequency control device forming a part of FIG. 11, and FIGS. 13, 14, and 15 are variable speed induction motor control devices of another embodiment of the present invention. Block diagram of No.
FIG. 16 is a block diagram showing an example of a conventional control device, FIGS. 17 (a) to (g) are waveform diagrams of signals in respective parts of the control device, and FIG. 18 is another example of the conventional control device. It is a block diagram. 1 ... Induction machine, 2 ... Water turbine, 3 ... Secondary excitation control device,
4 ... AC system, 4 ... Turbine characteristic function generator, 6 ... Rotation speed detector, 7 ... Slip phase detector, 8 ... Induction motor output command device, 9 ... Active power detector, 10 ... Guide valve drive device, 11 guide valve, 12 power receiving transformer, 13 frequency detector, 14,27 frequency controller, 15 speed command calculator, 16 speed control Equipment, 17,22,29 ……
Comparator, 18,30 ... Proportional element, 19,31 ... Integral element, 20,2
1,32 …… Adder, 23,25 …… Generation output correction command device, 24,
26,28 …… Adder, 33 …… Limiter, 34,35,341,342 ……
Power generation output limit calculator, 36 ... Power generation limit function generator.

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Akira Bando 3-1-1, Saiwaicho, Hitachi-shi, Ibaraki Hitachi Ltd. Hitachi factory (72) Inventor Nao Kuwahara 3-chome, Saiwaicho, Hitachi, Ibaraki No. 1 Stock company, Hitachi, Ltd., Hitachi factory (72) Inventor, Kazuo Nohara, 4026, Kuji-machi, Hitachi, Hitachi, Ibaraki Prefecture, Hitachi Research Laboratory, Hitachi, Ltd. (72) Kenichi Ono, 3-chome, Saiwai-cho, Hitachi, Ibaraki No. 1 No. 1 in Hitachi Works, Hitachi Ltd. (56) References JP-A-60-14775 (JP, A)

Claims (2)

[Claims] 1. A winding type induction machine having a primary winding and a secondary winding, which is rotationally driven by a water turbine whose water quantity is adjusted by a water quantity supply means, and a secondary winding of the winding type induction machine. In a variable-speed winding-type induction machine control device including an alternating-current excitation device for alternating-current excitation, a target rotation speed signal generation unit that inputs a power generation output command signal and outputs a target rotation speed signal of the winding-type induction machine,
AC excitation output correction means for inputting the rotation signal of the wire-wound induction machine and the target rotation speed signal to correct the AC excitation output of the AC excitation device, and the rotation signal of the wire-wound induction machine and the target rotation. A variable speed winding induction machine control device comprising: a supply water amount correction signal output means for inputting a number signal and outputting a supply water amount correction signal for correcting the supply water amount to the water amount supply means. 2. The variable speed winding type induction control device according to claim 1, wherein the AC excitation output correction means uses a deviation between the input rotation signal of the winding type induction machine and the target rotation speed signal. Correcting the AC excitation output of the AC exciter, and the supply water amount correction signal output means uses the deviation between the input rotation signal of the winding induction machine and the target rotation speed signal to correct the supply water amount. A variable speed winding type induction machine control device characterized by outputting a signal.