JPH0348757B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a control device for a hydraulic power generator using an arithmetic unit, and its purpose is to eliminate errors in flow rate-generator control output conversion and generator output-flow rate conversion. The purpose is to provide a control device that performs stable control.

FIG. 1 shows a block diagram of a control device for a hydraulic power generator showing one embodiment of the present invention.

In the figure, reference numeral 1 denotes a flow rate setting device, which outputs the set flow rate QX to a DI interface 3, which is a signal converter, and a verification circuit 14, which will be described later. 2 is a water tank water level detector which detects the water level of the water tank and outputs the detected water level HX to the DI interface 3;

4 surrounded by a dotted line is an arithmetic device section, which has a memory circuit 43 used by both a QP arithmetic device 41 that performs flow rate-generator control output conversion and a PQ arithmetic device 42 that performs generator output-flow rate conversion. are doing.

Furthermore, as shown in FIG. 2, the relationship between the output P and the flow rate Q and the water level H is shown in a graph. I remember.

Here, with the water level HX as the axis, the flow rate QX generator is QP calculation is defined as converting to output control power PX, and PQ calculation is defined as converting generator output P′X into flow rate QX′ for verification by calculating based on the plot point data of this graph. do.

The QP calculation device 41 includes a flow rate QX inputted from the flow rate setting device 1 and a water level HX inputted from the water level detector 2.
Accordingly, a QP calculation is performed using the data stored in the memory circuit 43 to obtain the generator control output PX, and this signal is output to the DO interface 5.

The PQ calculation device 42 is a generator output input from the hydraulic power generator 11 via the DI interface 12.
PX' and water level detector 2 to DI interface 3
With the water level HX input via the memory circuit 43
A PQ calculation is performed using the data stored in , to obtain the flow rate Q'X, and this signal is output to the DO interface 13.

Also, the output input to DO interface 5
PX is input to the matching point 6, subtracted from the output P'X from the generator 11, and passed through the deviation comparator 7, load adjustment device 8, speed governor 9, and water turbine 10 in this order. It is output to the hydraulic power generator 11 and closed loop control is performed.

The verification circuit 14 compares the flow rate QX input from the flow rate setting device 1 and the flow rate Q'x input from the DO interface 13, and sends the results to a host computer (not shown) via a remote monitoring control device 15.
Output to.

In the device configured as described above, the present invention is particularly provided with an arithmetic control device 4 for performing the following arithmetic operations, and the operation thereof will be explained next.

Now, the flow rate QX from the flow rate setter 1 and the water level HX from the water tank water level detector 2 are input to the QP calculation device 41 of the calculation control section 4 via the DI interface 3, respectively. The QP calculation device 41 calculates this flow rate QX and the water level.
Find the output PX from HX using the following method.

First, based on the input water level HX signal, the water level HX-1 closest to the negative side from the water level HX is determined from the memory circuit 43 in which the value marked with △ in the graph shown in FIG. 2 is plotted. Moreover, this water level HX
-1 and the closest plot points on the positive and negative sides of the input flow rate QX, in this case A and B, are found.

Next, in the same manner, the water level HX+1 which is closest to the positive side of the water level HX is determined, and the plot points C and D which are on this water level HX+1 and which are the closest to the positive and negative sides of the flow rate QX are determined.

The QP arithmetic unit 41 selects among the calculated points A to D,
Divide line AD and line BC by water level ratio=HX+1-HX/HX-HX-1 to find points K and L.

The obtained point L is the flow rate QX + 1 and this flow rate QX
It is the output value of PX+1 at +1 time, and point K is
Flow rate QX-1 and PX at this flow rate QX-1
It is an output value of -1, and is not the value of PX that we are trying to find.

Therefore, the flow rate QX+ found from these points L and K
1 and QX-1, find the ratio of flow rate = QX + 1-QX/QX-QX-1.

In other words, by finding this ratio, the dividing point between points L and K can be found, and this determines the flow rate.
The output PX at the time of QX is determined, and the QP calculation device 41 outputs this output PX to the DO interface 5 to control the hydraulic power generator 11 as described above.

On the other hand, the PQ calculation device 42 calculates the output P'X of the hydroelectric generator 11 inputted via the DI interface 12.
and the water level HX, calculate the flow rate Q′X using the following method.

First, points L' and K' are determined using the method described above.

Next, the flow rate Q'X is determined by distributing the line segment L'K' according to the output ratio of the following equation.

Ratio of output = P'X + 1 - P'X / P'X - P'X - 1 In this way, PQ conversion and
Since QP conversion is performed, there are no errors like in the conventional method.

In other words, when PX = P'X, QX = Q'X, as is clear from the above method.

Therefore, the data outputted from the PQ calculation device 42 to the verification circuit 14 via the DO interface 13 is error-free data, and the results of the verification circuit 14 are output to the host computer via the remote monitoring control device 15. Stable control can be performed.

Furthermore, the significance of notifying the higher-level computer of the comparison results of the verification circuit 14 is that the verification results can be used to determine whether or not normal control is being performed in the control device of this hydroelectric generator. , the host computer can determine whether this control device is normal or not.

As described above, the present invention eliminates errors in QP conversion and PQ conversion by performing calculations using the flow rate on the vertical axis and the water level output characteristics on the horizontal axis in the arithmetic control device, thereby improving control accuracy. It has excellent advantages such as:

[Brief explanation of drawings]

FIG. 1 is a configuration diagram showing an embodiment of the present invention, and FIG. 2 is a graph diagram for explaining the present invention. 1 is a flow rate setting device, 2 is a water tank water level detector, 3,
12 is the DI interface, 4 is the arithmetic unit, 4
1 is a QP calculation device, 42 is a PQ calculation device, 43 is a memory circuit, 5 and 13 are DO interfaces, 6 is a matching point, 7 is a deviation comparator, 8 is a load adjustment device, 9 is a speed governor, 10 1 is a water turbine, 11 is a hydraulic power generator, 14 is a verification circuit, and 15 is a remote monitoring and control device.

Claims (1)

[Claims] 1. In a device that controls a hydroelectric generator based on a flow rate QX signal from a flow rate setting device 1 and a water level HX signal from an upper water tank water level detector 2, the flow rate QX signal and the water level A QP calculation device 41 that introduces the HX signal via the DI interface 3, and a DI interface 12 that inputs the generator output P'X.
The output PX of the QP calculation device 41 is introduced through a memory circuit 43 in which the plot points of the graph of the output P according to the flow rate Q and the water level H are stored in advance, and the DO interface 5. The output of the deviation comparator 7 which calculates the deviation between this output and the output P′X of the generator is introduced, and the load adjustment device outputs the output to the generator 11 via the speed governor 9 and the water turbine 10, and the PQ A verification circuit 14 is provided which introduces the output Q'X of the arithmetic unit 42 via the DO interface 13, compares it with the output QX of the flow rate setting device 1, and outputs the output to the remote monitoring control device 15. The QP calculation device 41 calculates the ratio of water level = HX + 1 - HX / HX - HX from the values of HX - 1 which is closer to the negative side and HX + 1 which is closer to the positive side of the water level signal HX than the flow rate Q and water level H stored in the memory circuit 43. -1, and add positive to the flow rate signal QX on the HX,
Find the plot points of the flow rates QX-1 and QX+1 that are close to the negative side, calculate the flow rate ratio = QX + 1-QX/QX-QX-1, and calculate the generator calculated from this flow rate ratio and the output data of this plot point. DO control output PX
The PQ calculation device 42 outputs the water level HX-1 to the interface 5.
Find the plot points of P'X-1 and P'X+1, which are closest to the positive and negative sides of the generator output P'X, on HX+1,
Based on the water level ratio and plot point data, the water level is
Find the flow rates Q'X+1 and Q'X-1 on HX and corresponding to the outputs P'X-1 and P'X+1, and calculate the output ratio = P'X+1-P'X/P'X-P' 1. A control device for a hydraulic power generator, characterized in that the control device for a hydraulic power generator is configured to obtain a flow rate Q'X by calculating the flow rate Q'X using X-1, and output it to a DO interface 13.