JPS61170300A - Controller of variable speed water wheel generator - Google Patents

Abstract

PURPOSE:To enhance the stability of a power system by temporarily delaying the variation followed at the rotating speed to the optimum rotating speed command when a generator output command is abruptly varied, and directly controlling the generation output in response to the generation output command. CONSTITUTION:When a generation output command P0 and a water level detection signal H are input to a water wheel characteristic function generator 5, the optimum rotating speed command Na and the optimum guide valve opening command Ya are generated. The command Na is compared by a comparator 10 with the actual rotating speed signal N detected by a rotating speed detector 6, and its deviation DELTAN is input to a calculator 11. The calculator 11 outputs a correction signal DELTAC for correcting the command Ya. The signal DELTAC is added by an adder 13 to the command Ya, and input to a guide valve driver 8. The command P0 is also input to a comparator 15, compared with a generation output signal PG from a generation output detector 16, and its deviation P is input to a power controller 17 and a cycloconverter 3. Thus, the generation output of a wound-rotor type induction generator 1 is smoothly followed to the command P0.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to the installation of a width-loading system from a variable-speed water turbine using a scroll-type induction generator.

[Background of the invention]

As a control device 6' for this kind of variable speed water turbine generator, the eighth
Something like the one shown in the figure has been proposed. (For example, see Japanese Patent Application No. 57-182920.) In FIG. The secondary winding 1b is supplied with an AC excitation current adjusted to a predetermined phase according to the rotational speed of the generator 1 by the cycloconverter 3, and from the primary winding 1a of the generator 1, the power system +Y;!
+.

Variable speed operation is performed so that AC power of a constant frequency equal to the specified frequency of No. 4 is output.

5 is a water turbine characteristic function generation function, which inputs the rotational speeds U and N detected by the rotational speed detector 6, the power generation output command Po given from the outside S, and the water level detection signal 14, and calculates the maximum efficiency: Most stripped 1st rotation speed command N for l1l18 rotation
A and the optimum guide valve opening command Y are generated. 7 is a slip phase development guide 41fjJ, and its turntable is Kodenki IK+
At the same time, the negative winding 7a is connected to the output side of the power generation intake 1, and the slip phase signal S is output from the secondary winding j7b.
Output p. This slip phase signal Sp and the optimum rotational speed command N are given to the cycloconverter 3, and as described above, the AC excitation (
+& The phase of the current, etc. is controlled, and the optimum guide valve opening degree command Y11 is given to the guide valve drive device 8, and the opening degree of the guide valve 9 is controlled so that the water turbine output PT becomes an appropriate value M.

In such a control device, now the power generation output P.

In an attempt to increase the power generation output command P in a stepwise manner,
When changed as shown in FIG. 9(a) K, the step-like upper row of the power generation output command po - accordingly, the optimum rotational speed command N and the optimum guide valve opening command Y also change as shown in FIG. (b)
, as shown in (C), the opening degree Y of the guide valve is increased by the guide valve driving device 8, as shown in FIG. 9(d) VC.
As shown, the water turbine output PT is sequentially controlled to match the value of the optimum guide valve opening command Y&, and according to the change in the opening of the guide valve 9, the water turbine output PT also changes as shown in the ninth column (e) VC. Also, the value corresponds to the power generation output command Povc. On the other hand, in order to increase the rotational speed of the generator 10 as shown in Fig. 9(f) and match the optimum rotational speed command NaK, f is the rotational speed of the generator set corresponding to the additional load. Kinetic energy is required, but this -M! l! The only way to supplement the II energy is from either the water turbine output P or the electrical load on the generator 1, that is, the power generation output P0. However, as mentioned above, the water turbine output PT is determined by the optimum guide valve opening command Ya [the opening Y of the guide valve 9 which changes accordingly, and therefore does not increase immediately. Therefore, the operating energy is converted into the power generation output P.

As shown in Figure 9(g),
The power generation output P11, which should be increased, decreases transiently, causing problems in the operation of the power system. This problem is the power generation output P. It also occurs when you try to lower your level in steps.

[Purpose of the invention]

An object of the present invention is to solve the problems of the prior art described above.
It is an object of the present invention to provide a control device for a variable speed water turbine power generation device that can increase the stability of an electric power system by making the power generation output follow the power generation output command without reducing the power generation efficiency.

[Summary of the invention]

In order to achieve this object, the present invention provides an output detector for detecting the starting output after power generation, and a power generation output command detected by the starting output detector. and a power control device that controls the cross-excitation ml current given to the secondary @ line of the winding type generator according to the deviation of the power generation output command, and the water level detection signal and the power generation output command are input. A Mizutari characteristic function generator that outputs an optimal rotation speed command and an optimal guide valve opening signal, and inputs the deviation between the optimal rotation speed command and rotation speed signal and outputs a signal that takes this deviation as a value. When the power generation output command is changed stepwise, the rotational speed of the single-winding induction generator is temporarily [delayed] from changing in accordance with the optimum rotational speed command. The present invention is characterized in that the power generation output is directly controlled according to the power generation output command.

[Embodiments of the invention]

Hereinafter, the present invention will be explained with reference to the illustrated embodiments.

FIG. 1 is a block diagram of a control device according to an embodiment of the present invention. In FIG. 1, the same reference numerals as in FIG. 8 indicate the same or equivalent components.

The power generation output command PO and the water level detection signal H are input to the water turbine characteristic function generator 5, and the optimum rotation speed command deviation ΔN (=N
, -N) are input to the arithmetic unit 11. Performance = Instrument 11 has 1 for the proportional element and 27 s for the integral element.

It consists of a differential element S and an adder 12, and outputs a correction signal ΔC that corrects the optimum guide valve opening command Y so as to make the deviation ΔN zero as long as it exists. This correction signal ΔC is added to the optimum guide valve opening command Ya in the adder 13, and the output from the adder 13, that is, the corrected guide valve opening command (Y−+ΔC) is input to the guide valve driving device 8. Ru. The guide valve driving device 8 is connected to an adder 14 and an integral system. /S, the output of which is negatively fed back to the adder 14.

The power generation output command PO is also input to a comparator 15, and the other input is an actual power generation output signal P detected by a power generation output detector 16. The deviation ΔP (
=pO-p, ) is input to the power control device 7.17. The power control device 17 includes a proportional element 1 (5), an integral element 1 (./S), and an adder 18, the output of which is input to the cycloconverter 3.

In the control device of this embodiment configured in this way, for example, in order to increase the power generation output P0 stepwise, the power generation output command 1)0 is changed to the second Cm (a).
When Vc is raised stepwise as shown, generator 1
Power generation output P. As shown in Fig. 2<g), P increases following the change in the power generation output command P.

In other words, the integral element included in the power control device 17 has 6/
The deviation ΔP (:=p6-p
o) gradually decreases to p,=po at steady state. On the other hand, the optimum guide valve opening command Y.

The responsiveness of the opening degree Y of the guide valve 9 to the above-mentioned power generation output command P, [power generation output P to. Responsiveness is slower than . Therefore, the power generation output P. Is the water turbine output P? As shown in Figure 2), the rotational speed N is temporarily decelerated after the sudden change in the power generation output command Po, and then,
At time t1, as shown in Fig. 2(d), the 5IC1 guide valve opening Y becomes equal to the optimum guide valve opening command Y, and the power generation output P0
Since the water turbine output PT becomes approximately equal to PT, the rotational speed N stops decreasing.

Note that at time t, the actual rotational speed N is lower than the optimum rotational speed command Na, the deviation ΔN (=N, -N) is positive, and the correction signal ΔC output from the calculator 11 is positive. , the guide valve opening command ('
l'a+ΔC) is smaller than the optimum guide valve opening command Ya, and eventually the water turbine output PT becomes smaller than the power generation output P0. Therefore, as the rotational speed N increases and approaches the optimum rotational speed command Na vc, the correction signal ΔC also approaches zero, and finally the guide valve opening Y matches the optimum guide valve opening command Ya, and the rotational speed N It becomes equal to the optimum rotation speed command. That is, the integral element included in the arithmetic unit 11 includes /S, the arithmetic unit 11, the adder 13, the guide valve + m shift device 8, and the guide valve 9.
, water turbine 2, generator 1, rotational speed detector 6 and comparator 1
0, the deviation ΔN (=
Na-N) gradually decreases to KN=Na at steady state.

Further, during steady state, the deviation ΔY(-Y, -Y)=o, that is, Y,=Y, is achieved as follows. (a) The optimum guide valve opening degree command Y output from the water turbine characteristic function generator 5 is, of course, equivalent to the power generation output command Po. (b) As mentioned above, P during steady state. - becomes Po. (c) What is the inertial effect of all rotating parts such as the rotor of the water turbine 20 launch and the generator 1, which is the water turbine output P? It is speeded up or slowed down depending on the difference between the output power and the power generation output P, and can be seen as a kind of integral element. Therefore, since a negative feedback circuit is configured, the state becomes PT-Po during steady state. ) Guide valve open & Y is water turbine output P? This corresponds to If we combine the above (a) ~), we get the deviation ΔY(-Y
, -Y) -〇, that is, Y, =Y.

3 and 4 are block diagrams of control devices according to other embodiments of the present invention.

In these embodiments, the IJ positive signal Δ from the arithmetic unit 11 is
Instead of being added to the optimum guide valve opening command Y, C is added to the power generation output command Po in the adder 19, or added to the water level detection signal I4 in the adder 20, and then sent to the water turbine characteristic function generator 5. It has been entered.

The rest of the structure is the same as the embodiment shown in FIG.

Therefore, according to each of these embodiments, the power generation output command Po or the water level detection signal H is corrected by the correction signal ΔC and input to the water turbine characteristic function generator 5, and the output thereof, the optimum guide valve opening command Ya, is , as shown in Figure 5(b)K,
Since the signal increases in the same way as the input signal (Y, +ΔC) to the guide valve drive device 8 in the embodiment of FIG. 1, the same effect as in the embodiment of FIG. 1 can be obtained. In addition, the power generation output command Po
Alternatively, when the water level detection signal H is corrected by the correction signal ΔCK, the optimum rotational speed command N also changes, but the rate of change is small compared to the optimum guide valve opening command Ya (7), so it hardly changes. Which can be ignored.

Furthermore, FIG. 6 is a block diagram of a control device according to still another embodiment of the present invention.

This embodiment differs from the embodiment shown in FIG. The power correction function generator 21 that generates and this power correction signal ΔP
An adder 22 that subtracts c from the power generation output command Po is provided.

Therefore, according to this embodiment, when the power generation output command P is increased in a stepwise manner and the deviation ΔN between the optimum rotational speed command Na and the rotational speed N exceeds a predetermined value, the power correction function generator 21 outputs electric power. A correction signal Δpe is generated, which is added to the adder 22 and subtracted from the power generation output command P, so that the output power P is as shown in FIG. 7(g).
Compared to FIG. 2(g), it increases more slowly following the change in the power generation output command Po. On the other hand, as shown in Fig. 7(f) K, the decrease in the rotational speed N by one rotational speed N is suppressed by that amount, and the rotational speed N with respect to the change in the optimum rotational speed command Na.
response becomes faster. That is, the power generation output PQ and the rotational speed N can be made to follow changes in the power generation output command P while maintaining harmony between the two.

〔Effect of the invention〕

As explained above, according to the present invention, when the power generation output command is suddenly changed, the rotational speed of the single-winding induction generator is temporarily delayed from changing in accordance with the optimum rotational speed command, thereby generating power. Since the output is directly controlled according to the power generation output command, the power generation output can be made to smoothly follow the power generation output command, and the stability of the power system can be improved. Also 1
If changing the rotational speed in accordance with the optimum rotational speed command is delayed, the power generation efficiency will be reduced by that amount, but this is for an extremely short period of time and can be almost ignored.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a control device according to an embodiment of the present invention, FIGS. 2(a) to (g) are waveform diagrams of signals in each part of the control device, and FIGS. 3 and 4 are diagrams of the present invention. Block diagrams of control devices according to other embodiments, FIGS. 5(a) to 5(g)
6 is a waveform diagram of signals in each part of the control device, and FIG. 6 is a block diagram of a control device according to still another embodiment of the present invention.
Figures 7 (a) to (g) are waveform diagrams of signals in each part of the same control device, Figure 8 is a block diagram showing an example of a conventional control device, and Figures 9 (a) to (g) are the same control FIG. 3 is a waveform diagram of signals in each part of the device. 1... Wound induction generator, 2... Water turbine, 3... Cyclo converter, 5...
Water turbine characteristic function generator. 6... Rotation speed detector, 7... Slip phase detection induction machine, 8... Guide valve drive device,
9... Guide valve, 10... Comparator, 11
...... Arithmetic unit, 13... Adder, 15.
... Comparator, 16 ... Power generation output detector,
17...'Power control device, 19.20...
... Adder, 2] ... Power correction function generator, 2
2... Enhancer. Figure 8 Figure 9 (Mold opening lL'l. 17'+opening

Claims (1)

[Claims] 1. A wound induction generator connected to an electric power system, a water wheel that rotationally drives the wound induction generator, a guide valve that adjusts the amount of water supplied to the water turbine, and this guide. A guide valve drive device that controls the opening degree of the valve according to a guide valve opening command, and a rotation speed detector that detects the rotation speed of the wound induction generator, and the rotation speed obtained from the rotation speed detector. The alternating current excitation current applied to the secondary winding of the wound induction generator and the opening degree of the guide valve are controlled according to the speed signal, a water level detection signal given from the outside, and a power generation output command. In a control device for a variable speed water turbine generator, which rotates the generator at an optimum rotational speed and generates alternating current power having the same rated frequency as the power system in the primary winding of the wound induction generator, a power generation output detector that detects the power generation output; and a power control device that controls an AC excitation current applied to the secondary winding according to a deviation between the power generation output signal detected by the power generation output detector and the power generation output command. , a water turbine characteristic function generator that inputs the water level detection signal and the power generation output command and outputs an optimum rotation speed command and an optimum guide valve opening degree command; and a water turbine characteristic function generator that inputs the deviation between the optimum rotation speed command and the rotation speed command. 1. A control device for a variable speed water turbine power generator, comprising: a correction calculator that outputs a correction signal that makes the deviation of the lever zero. 2. A control device for a variable speed water turbine generator according to claim 1, characterized in that the correction signal is input to the guide valve driving device in addition to the optimum guide valve opening command. . 3. A control device for a variable speed water turbine power generator according to claim 1, wherein the correction signal is input to the water turbine characteristic function generator in addition to the power generation output command. 4. A control device for a variable speed water turbine power generator according to claim 1, characterized in that the correction signal is input to the water turbine characteristic function generator in addition to the water level detection signal. 5. In claim 1, when the deviation between the optimum rotational speed command and the rotational speed signal exceeds a predetermined value,
A control device for a variable speed water turbine power generation device, characterized in that the power generation output command is adjusted according to the deviation and inputted to the power control device.