JP3085802B2 - Signal processing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a power plant.
Control system based on gas temperature measurement of gas turbine
A controller based on measured values where the measurement location has a spread as a surface
The present invention relates to a signal processing device suitable for use in a system, and particularly for the purpose of improving reliability, signal processing for input redundancy for inputting a plurality of signals of the same content, from a large number of uneven input signals to a target signal. The present invention relates to a signal processing device applied to multi-input signal processing for calculating and outputting signals.

[0002]

2. Description of the Related Art Conventionally, gas turbines in power plants
In the control mechanism based on the measurement of the gas temperature of the input, as a method of eliminating abnormal inputs in the multi-input signal processing, as shown in FIG. 4, a plurality of input signal sources (I) 11 and 1 are used.
An abnormal input disconnection mechanism 3 is provided by a signal Zi (i = 1, 2,... N) that detects an input abnormality by an input abnormality detection mechanism (D) 21, 22,.
i is applied to separate the corresponding input point from the signal processing mechanism 5, and the signal processing mechanism 5 performs processing using only remaining normal input values.

For this reason, since the signal processing mechanism 5 selectively uses only normal input points, additional processing based on information from the normal input point selection processing mechanism (SEL) 4 is required, and the configuration is complicated. There is a disadvantage. In addition, if there is a variation in the input signal value, there is a defect that the signal processing result may cause an unintended sudden change when the shifted abnormal input point is separated or restored.

[0004] Further, in order to prevent this abrupt change, as shown in FIG. 5, a mechanism for preventing the abrupt change of the signal (S) 6
Conceivable means for inserting the output of the signal processing mechanism 5, but incomplete resulting in response delay due mechanism 6 input to prevent rapid changes in the always signals in the normal case.

[0005]

As described above, in the conventional signal processing apparatus for processing signals at multiple input points, as shown in FIG. 4, a signal processing apparatus for selectively using only normal input points is used. There is a problem that the configuration is complicated because a mechanism for changing the processing content is required. Further, as shown in FIG. 5, it is conceivable to provide a circuit for preventing an abrupt change of a signal in order to eliminate an unintended sudden change of a signal processing result generated when an input point is separated or restored. However, in this case, there is a problem that the response delay is caused by the insertion of the circuit.

The present invention has been made in view of the above circumstances,
Also for gas temperature measurement of gas turbine in power plant
Such as a control mechanism based on the
In signal processing devices used in control mechanisms based on measured values
In the prior art, it is indispensable to change the processing content for selectively processing only normal input points and perform signal processing of multiple input points without the need for a normal input point selection processing mechanism. It is an object to provide a signal processing device.
Another object of the present invention is to provide a signal processing device that does not cause an unintended sudden change of a signal processing result generated at the time of disconnection or return of an input point, and that does not cause a response delay. I do.

Another object of the present invention is to provide a signal processing apparatus which does not cause an unintended sudden change in a signal processing result generated when an input point is separated or returned, and does not cause a response delay. With the goal.

[0008]

According to the present invention, a power generation plug is provided.
Based on gas temperature measurement of gas turbine
For measurement values where the measurement location spreads as a surface, such as a control mechanism
The signal processing device used in the control mechanism based on a plurality of similar signals as inputs, as accurate as possible even for some of the abnormalities, and does not cause a sudden change in the signal independent of the change in the input In this manner, processing that does not cause a delay in response is realized by the following configuration (1) or (2).

That is, as shown in FIG. 1, when the input abnormality detecting mechanism 2i (i = 1, 2,... N) detects an abnormality of the input signal source 1i, as shown in FIG. The abnormal input switching mechanism 7i is operated to switch the value of the corresponding input point to the output value of the signal processing mechanism 5.

Further, as shown in FIG. 2, according to the present invention, on the input side of the signal processing mechanism 5, signal sudden change preventing mechanisms 61, 62,.
.. 6n are provided.

[0011]

In the configuration shown in FIG. 1, when the input abnormality detection mechanism 2i (i = 1, 2,... N) detects an abnormality in the value (Xi) of the input signal source 1i, the input abnormality detection signal By the input switching of the abnormal input switching mechanism 7i according to Zi, the value of the corresponding input point is switched to the output value of the signal processing mechanism 5. Thus, the signal processing mechanism 5 only has to always execute the arithmetic processing for a fixed number (n), which is the total number of input points, irrespective of the presence or absence of an input abnormality, and thus selectively process only normal input points. This does not require a process for changing processing contents and a normal input point selection processing mechanism, thereby simplifying the device configuration and improving reliability.

In the configuration shown in FIG. 2, the mechanism 6i for preventing a sudden change in the signal operates only for a predetermined period from the time when the input abnormality is detected. That is, by the function of the mechanism 6i for preventing a sudden change in the signal, the mechanism 6i for preventing the sudden change in the signal is operated only until the output value substantially matches the input value and stabilizes. Do not work. This makes it possible to provide a highly reliable signal processing device that does not cause an unintended sudden change in the signal processing result generated when the input point is separated or returned, and does not cause a response delay.

[0013]

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

According to the present invention, as means for excluding an abnormal input value, as shown in FIG. 1, an abnormal input switching mechanism 7i is actuated by a signal Zi detected by an input abnormality detecting mechanism 2i. The value of the input point is calculated by the signal processing unit 5.
The average value is replaced with the output value of the signal processing mechanism 5.

By employing this means, the signal processing mechanism 5 only needs to always execute the arithmetic processing for a fixed number n, which is the total number of input points, regardless of the presence or absence of an input abnormality.

This eliminates the need for the processing for changing the processing contents for selectively processing only the normal input points and the normal input point selection processing mechanism 4 which are indispensable in the prior art, and simplifies the apparatus. Reliability is also improved. By adopting the above-described means, the problem that the device becomes complicated in the related art is solved.

However, if the input signal value varies, the problem that the signal processing result changes unexpectedly when the shifted abnormal input point is switched to the output value of the signal processing mechanism 5 is essentially a problem. Is not resolved. On the other hand, as in the prior art shown in FIG. 5, a configuration in which a mechanism 6 for preventing a sudden change of a signal is conceivable, but an unnecessary response delay always occurs.

In the signal processing device according to the present invention, as a means for removing an abnormal input, this is realized by replacing the value of the abnormal input point with the output value of the signal processing mechanism 5 without separating the abnormal input point. Furthermore, paying attention to the fact that all the input points of the signal processing mechanism 5 operate in the same manner as in the normal state,
As shown in FIG. 2, mechanisms 61, 62,..., 6n for preventing abrupt changes in signals are inserted at each input side of the signal processing mechanism 5.

Further, the mechanism 6i inserted at each input side for preventing a sudden change in the signal is provided by the input abnormality detecting mechanism 2
After the input abnormality is detected, the signal is applied only until the output value is almost equal to the input value and stabilized by the operation of the mechanism 6i for preventing a sudden change in the signal. The mechanism 6i for preventing abrupt changes in is not operated.

By this means, no abrupt change of the signal occurs at the time of switching and returning of the abnormal input point, and no response delay occurs at the time of normal input. Further, since the mechanism 6i for preventing a sudden change in the signal operates only at the corresponding abnormal input point, no response delay occurs to other normal inputs during this switching.

Specifically, as means for determining the period during which the mechanism 6i for preventing a sudden change in the signal is operated, as shown in FIG. 3, the input and output of the mechanism 6i for preventing the sudden change in the signal are used. Means for confirming the value by the signal coincidence detecting mechanism 8i and terminating the operation when the value between the input and the output substantially coincides can be applied.

Further, a mechanism 6 for preventing a sudden change in the signal.
When i is composed of a first-order lag element, it is known that the output value substantially matches the input value after a time equal to or more than three times the time constant of the first-order lag element. After the switching by the detection, it is possible to terminate the operation of the mechanism 6i for preventing a sudden change of the signal by a time limit element which operates after about three times the time constant of the primary delay element. According to this means, the circuit can be further simplified.

Next, it will be described that the configuration shown in FIG. 1 can correctly exclude an abnormal input point. In the following description, it will row a illustrating the average value calculation method, which is most common as a signal processing unit as an example.

That is, when an input error occurs, the abnormal input point is replaced with the signal processing output value, so that the abnormal input point is separated and the same result as when signal processing is performed using only the values of the remaining normal input points is obtained. It turns out to be. Next, examples of machines which are effective by specifically applying the embodiments shown in FIGS. 1 and 2 will be described.

In a cogeneration or combined power generation plant using a gas turbine, which has recently attracted attention as an efficient use of energy, it is particularly necessary to accurately grasp the combustion gas temperature of the gas turbine in order to maintain the highest possible efficiency. It is. On the other hand, these gas turbines are usually provided with a plurality of combustors, and the combustion gas flows in a distributed manner in the gas passage.In order to correctly measure these, a plurality of temperature detection devices are provided in the gas passage, An average temperature is obtained from the plurality of temperature signals and used for controlling important temperatures of the gas turbine. Used for this temperature control,
It is important that the measurement of the combustion gas temperature also provides a response as fast as possible.

Conventionally, the temperature signal processing used for this purpose has only a configuration as shown in FIG. 4, so that the apparatus configuration is complicated, and a sudden change in the temperature signal at the time of abnormality is tolerated. I had no choice.

On the other hand, by applying the embodiment of the present invention shown in FIGS. 1 and 2, a correct average temperature signal can be obtained from signals from a plurality of temperature detectors without complicating the structure of the apparatus. It is possible to obtain without delay of response, and controllability and reliability of the gas turbine can be greatly improved.

[0028]

According to the present invention, as described above in detail, according to the present invention, the calling
Based on gas temperature measurement of gas turbine in power plant
Measurement where the measurement location is wide as a surface, such as a control mechanism
In a signal processor used for a value-based control mechanism
Te, when an abnormality in the number of one of the input point signal of the input signal source to be subjected to signal processing occurs, the value of the input point signal
The signal processing mechanism always performs the arithmetic processing for a certain input that is the total number of input points regardless of the presence or absence of an input error by adopting a configuration that switches to the output value of the signal processing mechanism that has been subjected to the average value calculation processing by the signal processing mechanism Therefore, it is possible to simplify the apparatus configuration and improve the reliability by eliminating the processing for changing the processing content for selectively processing only the normal input points and the normal input point selection processing mechanism.

Further, according to the present invention, the input side of the signal processing mechanism is provided with a signal sudden change preventing mechanism which operates for a predetermined time for preventing a sudden change of the signal, so that the input point can be disconnected. Thus, it is possible to realize a highly reliable signal processing device that does not cause an unintended sudden change of a signal processing result generated at the time of return or the like and does not cause a response delay.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an apparatus according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of a mechanism for preventing a sudden change in a signal in the embodiment.

FIG. 3 is a block diagram showing a configuration example of an operation control mechanism in the mechanism shown in FIG. 2;

FIG. 4 is a block diagram showing a configuration of a conventional signal processing device.

FIG. 5 is a block diagram showing a configuration of a mechanism for preventing a sudden change in a signal in a conventional signal processing device.

[Explanation of symbols]

..,... 1n...
... Input abnormality detection mechanism, 5 ... Signal processing mechanism, 61, 62,
... 6n: Signal sudden change prevention mechanism, 71, 72,... 7n: Abnormal input switching mechanism.

Claims (2)

(57) [Claims] 1. A signal processing device used in a power plant.
A signal processing mechanism for obtaining a single output signal obtained by averaging the signals from a multi-point input signal, and an input for detecting a signal abnormality at each input point supplied to the signal processing mechanism. According to the abnormality detection mechanism and the detection signal of the input abnormality detection mechanism,
An abnormal input switching mechanism that replaces an abnormal input point signal with an output signal of the signal processing mechanism and removes an abnormal input point signal from the signal processing mechanism among the input point signals supplied to the signal processing mechanism. A signal processing device comprising: 2. A signal processing mechanism for obtaining a single output signal from a multipoint input signal, an input abnormality detecting mechanism for detecting a signal abnormality at each input point supplied to the signal processing mechanism, and an input abnormality detecting mechanism Of the input point signals supplied to the signal processing mechanism in accordance with the detection signal, the abnormal input point signal is replaced with the output signal of the signal processing mechanism, and the abnormal input point signal is excluded from the signal processing mechanism. An abnormal input switching mechanism, and a mechanism interposed between the abnormal input switching mechanism and the signal processing mechanism, which operates for a certain period in accordance with the abnormality detection of the abnormality detection mechanism to prevent a sudden change of the input point signal. A signal processing device, comprising: