JPH048612B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a gas turbine engine-driven power generation device, and particularly to an automatic operation control device for the emergency power generation device.

"Prior Art" Conventionally, gas turbine engine-driven power generators have been used as emergency power generators in response to situations such as power outages.

With conventional equipment, it is not possible to properly control the operation of a wide range of control items, such as the rotational speed of the gas turbine engine, exhaust temperature, and lubricating oil pressure, and measures are taken to stop the gas turbine engine, especially when startup fails. The subsequent treatment is left to humans. When used as an emergency power generator, this point is extremely unsatisfactory, and improvements are desired.

Furthermore, when monitoring the operating status of a gas turbine power generation system, only some of the items that require monitoring, such as overspeed of the gas turbine engine, abnormal rise in exhaust temperature, and abnormal drop in lubricating oil pressure, are monitored, which is insufficient. be. In addition, when controlling this type of automatic control device using a microcomputer, in conventional devices, if the I/O port becomes high impedance, control signals that should not be output are output, and the gas turbine engine may have an adverse effect on driving.

Furthermore, in this type of automatic control device that has been used conventionally, there is It was not possible to easily check the wiring, and it was also not possible to independently check whether each auxiliary machine was operating properly without starting the gas turbine engine.

The increase in control targets, monitoring items, and alarm display items has made wiring complex and difficult to check.
It is desired that a simple means for inspecting wiring be realized. Furthermore, there has been a demand for a means for easily performing tests after installation of a gas turbine power generating apparatus, inspection after handling an abnormal situation, preparation for operation, and the like.

"Problems to be Solved by the Invention" The present invention is intended to solve the above-mentioned problems with conventionally used control devices of this type, and aims to solve the following problems.

The first object of the present invention is to detect external signals supplied in the event of an abnormality in the electrical system such as a power outage, and detection signals corresponding to operating conditions such as the rotation speed, exhaust temperature, and lubricating oil pressure of the gas turbine engine. Accordingly, the operation of the gas turbine power generation device including automatically starting, stopping and restarting the gas turbine engine is comprehensively and appropriately controlled. In particular, if the gas turbine engine does not reach a state capable of self-sustaining operation after one startup, the startup operation (hereinafter abbreviated as "restart") is automatically performed again.

The second object of the present invention is to prevent runaway of the central processing unit (hereinafter referred to as CPU) and input/output interface (hereinafter referred to as CPU) in a control device for a gas turbine power generator (hereinafter referred to as “control device”) using a microcomputer. This is to ensure safety in the event that appropriate control signals, etc. cannot be obtained due to destruction of the I/O (abbreviated as I/O).

"Structure of the Invention" This invention provides a rotational speed detection means for detecting the rotational speed of a gas turbine engine;
An ignition confirmation means for confirming that ignition has occurred in the combustion chamber and a hydraulic pressure detection means for detecting the pressure of lubricating oil are provided, and on the other hand, after the gas turbine engine is started, the ignition confirmation means indicates that no ignition has occurred. When it is confirmed that the gas turbine engine is ignited, the first means stops and restarts the gas turbine engine after a predetermined time has elapsed, and when the ignition confirmation means confirms ignition, the rotation speed detection means detects that the rotation speed has reached the first predetermined rotation speed. If it is confirmed that the rotation speed has reached the first rotation speed, the second means restarts the engine after a predetermined period of time, and if it is confirmed that the rotation speed has reached the first rotation speed, the starter of the gas turbine engine and the auxiliary equipment of the ignition device are stopped. and a fourth means for restarting the auxiliary machine when the pressure of the lubricating oil is confirmed to be below a predetermined value by the oil pressure detection means after the auxiliary machine is stopped.
and a fifth means for restarting the engine after a predetermined time when the rotation speed detecting means confirms that the oil pressure is higher than a predetermined value and that the rotation speed is not at the second predetermined rotation speed. There is.

Furthermore, the present invention is configured such that sequence control is performed by a microcomputer, and individual output ports for control signals of various devices related to the operation of the gas turbine engine are grounded via resistors.

With such a configuration, in the present invention, the gas turbine engine is automatically and appropriately started, stopped, restarted, etc., depending on the operating state of the gas turbine power generator.

Furthermore, fail-safe measures are taken at the output interface of the control device, improving control safety.

``Example'' The configuration of an automatic control device for a gas turbine power generator according to the present invention will be described below based on an example with reference to the drawings.

As shown in FIG. 1, the automatic control device for a gas turbine engine of the present invention includes a sensor 1 that detects parameters related to the operating state of the gas turbine engine, a detection circuit 2 that processes the signal, a multiplexer 3 (MPX), a sample hold Circuit 4 (S/
H), A/D converter 5, detection unit 6 for detecting power outages and abnormalities in power generation status, etc., operation mode changeover switch (hereinafter referred to as
(abbreviated as switching SW) 7, operation unit 10 consisting of setting SW 8, inspection SW 9, etc., I/O 11, bus 12, CPU
13, ROM14, RAM15, clock 16,
Control, alarm and display output interface 1
7, 18, and 19, and a display section 20.

That is, parameter signals related to the operating state of the gas turbine engine, such as the gas turbine engine rotational speed 1a and exhaust temperature 1b, detected by the sensor 1 and processed by the detection circuit 2 to a signal level that can be post-processed, are sequentially taken in by the multiplexer 3. is sent to the sample and hold circuit 4, and then
It is converted into a digital signal by the D converter 5, and the I/O
11 and stored in the RAM 15. In addition, an abnormality in the power generation state such as a power outage 6a or power generation establishment 6b is detected by the detection unit 6, and is detected by the RAM 1 via the I/O 11.
It will be incorporated into 5.

By the way, the ROM 14 stores a program that is in charge of overall control of the operation, alarms, and displays of the gas turbine generator, and based on this program,
The CPU 13 determines and controls each process. Also I/O
At 11, inputs such as switch data and control outputs are controlled. Control output signals and the like from the I/O 11 are applied to output interfaces 17 to 19 consisting of transistors, relays, etc., and output as control, alarm, and display outputs, respectively.

That is, sensor signals related to the operating state of the gas turbine engine and detection signals such as power outages and abnormalities in the power generation state are captured. CPU13 is ROM1 in advance
4, performs comparative calculations based on the operating sequence stored in 4, the setting conditions, the clock signal from the clock 16, etc., and determines actions such as starting, stopping, restarting, load switching, and generating an alarm for the gas turbine engine.
Based on the determination result, control signals and the like are outputted to the output interfaces 17 to 19 via the I/O 11. The display unit 20 performs display based on the control signal.

On the other hand, the operation section 10 includes a mode switching SW 7 for setting operation modes such as manual, automatic, and test, a digital SW for setting operation sequence control time of the gas turbine engine, and the display section for displaying operations or alarms. In addition to a setting SW 8 such as a digital SW for setting display contents on the alarm 20, an alarm return SW 10a for resetting an alarm, and the like, an inspection SW 9 is provided as a means for achieving the fifth object of the present invention.

In other words, when inspection SW9a is input, CPU13
In response to this signal, reads out the procedure stored in the ROM 14 in advance, that is, the procedure for activating the ignition device, and outputs the I/O 11 and the output interface 17.
Since the control output of the ignition device 17a is obtained and the ignition device 17a is operated, the wiring leading to the ignition device and its operation are checked.

When inspection SW9b is input, control outputs for the solenoid valves in the fuel supply path such as the fuel cutoff valve 17b, bypass valve 17c, and enrichment valve 11d are obtained in the same way, and these auxiliary machines are activated, so check their wiring and operation. will be held. Check in the same way
In response to the input of SW9c, the fuel pump 17e,
Since the control outputs of the bypass valve 17c and the enrichment valve 17d are obtained and these auxiliary machines are operated,
The suitability of the wiring leading to this and the operation of these auxiliary machines are checked. Further, this operation is also used for the purpose of venting air from the fuel supply path.

Similarly, control outputs of the starter 17f, air assist pump 17g, and bypass valve 17c are obtained in response to the input of the inspection SW 9d, and since these auxiliary machines are operated, the suitability of the wiring leading to them and the operation of each auxiliary machine are checked. A check is performed. This operation is also used for cranking purposes in gas turbine engines.

As described above, during the inspection, the auxiliary machines are divided into four groups so that the gas turbine engine cannot be started independently, and each group is functionalized.

Further, when an abnormality occurs, an alarm output signal is outputted via the output interface 18, and an alarm is sounded by a bell or the like. When the setting SW 8 is set to an error display code, a corresponding abnormality display is displayed on the display section 20 of a lamp, printer, CRT, etc. via the display interface 19.

Further, set SW8 to, for example, gas turbine engine rotational speed 19d, exhaust temperature 19e, month/day 1.
When a display code such as an operating state parameter such as 9f is set, a display of the corresponding item can be obtained on the display unit 20 via the display interface 19.

Next, an embodiment of the operation control of the control device according to the present invention will be described based on a series of flowcharts shown in FIGS. 2 to 5.

Figure 2 is a flowchart when starting a gas turbine engine. When a start command is received in step _S1 , the gas turbine engine overspeeds, abnormally increases exhaust temperature, abnormally increases lubricating oil temperature, abnormality in control device power supply, abnormality in detection sensor, etc. Continuous monitoring of constant monitoring items will be carried out throughout the period. Immediately when it is determined that this item is abnormal, the constant monitoring item abnormality process described below is performed and the operation is stopped. Additionally, ambient temperature control using heaters and fans continues throughout the entire period.

Next, in step _S2 , the starter and ignition system are started, the fuel cutoff valve is opened, and starting is performed. In step _S3 , it is determined whether or not the specified rotation speed has been reached within the specified number of times of starting. If the starting is not started, the starting abnormality processing described below is carried out, and if it is starting, the step is stopped.
In _S4 , ignition is checked to see if the exhaust gas temperature has risen to a predetermined temperature within a predetermined time. When it is determined that there is no ignition, the process proceeds to restart as shown in FIG. 4, which will be described later.

When ignition is confirmed, it is determined in step _S5 whether the first set speed has been reached within a predetermined time, and if the first set speed has not been reached, the process proceeds to restart as described above, and if it has been reached, the starter is restarted in step _S6 . and stop the ignition system auxiliary equipment. Next, in step _S7 , it is similarly determined whether or not the second set speed has been reached within a predetermined time. If the second set speed has not been reached, the process proceeds to the above-mentioned restart, and if it has been reached, the power generation and Proceed to stop control. Between steps _S6 and _S7 , the lubricating oil pressure is monitored, and when it falls below a set value, the restart is performed.

Next, Figure 3 is a control flowchart for power generation/shutdown.
Proceed to this step from step S ₇ in the figure, and first proceed to step S7.
After energizing the generator in _S8 , overvoltage, overvoltage and
Load operation will continue as long as there are no voltage abnormalities such as undervoltage, hydraulic abnormalities such as abnormally low lubricating oil pressure, abnormalities in constant monitoring items, or stop commands. Even if any of the above-mentioned abnormalities or commands is determined or detected, the processing immediately proceeds and the operation is stopped.

Now, the flowchart of the restart control that is automatically performed when startup fails is shown in Figure 4. First, at S ₁ ',
Check whether there are predetermined conditions that allow restart, such as whether there is an automatic mode and a power outage signal, or whether there is a test mode. Next, up to S ₄ ', the process proceeds in the same manner as steps S ₁ to S ₄ at the time of startup described in FIG. If it is determined that there is no ignition in step _S4 ', the process moves to the ignition abnormality processing described later, and if ignition is confirmed, the first speed check is performed in _S5 ', and the specified rotation speed is reached within a certain period of time. If not, proceed to startup abnormality processing described later. When the rotational speed is at a predetermined value, _the auxiliary equipment is stopped at step S ₆ ′ in the same way as step S ₆ in FIG.
The speed will be checked.

In this step, the rotation speed increases further within a certain period of time, and if it does not reach the predetermined value, it moves to acceleration abnormality processing, and if it reaches the predetermined value, it proceeds to power generation/stop control step _S8 shown in Figure 3. Proceed to.

Note that it is also possible to create a sequence that allows the same system to be restarted multiple times.

The above-mentioned abnormality processing and stop processing are respectively processed in subroutines shown in FIG. That is, the constant monitoring items, oil pressure, acceleration, voltage, and ignition abnormality processing are shown in Fig. 5a, and the starting abnormality processing is shown in Fig. 5b.
The stop processing is performed in FIG. 5c, and the controller abnormality processing is stopped or alarmed in FIG. 5d, and after the alarm returns, the system returns to the standby state. Further, the contents of the stop and alarm in the subroutine shown in FIG. 5 are as illustrated in FIG. 6.

A configuration for achieving the second object of the invention is illustrated in FIG. That is, in the control device of the present invention using a microcomputer, the I/O
Control terminals of switching elements constituting output interfaces 17 to 19 connected to output ports 21 of 11 are grounded via resistors 23.
As a result, even if the CPU goes out of control or the I/O 11 is destroyed, and the I/O port 11 is disconnected, the relay R will not operate and its contact r will be opened, so the output signal will not change. The starter, ignition system, and other auxiliary equipment will be stopped. In addition, an emergency stop switch 24 is provided on the power line at the final stage of the output section, so that all outputs can be shut off.

"Effects of the Invention" With the above configuration, the present invention can, firstly, automatically and appropriately control the start, stop, and restart of the gas turbine engine according to an external signal such as a power outage and the operating state of the gas turbine generator. . In particular, if the robot cannot move independently after a single activation, it will be restarted automatically, doubling the reliability of activation.
This point has an immeasurable effect, especially in emergency power generators.

A second effect of the present invention is that fail-safe measures are taken for the output interface of the control device, so that control safety is improved.

As explained in detail above, according to the present invention, operation control such as starting, stopping, restarting, and load switching of the gas turbine engine is automatically performed under optimal conditions in accordance with external signals and the operating state of the gas turbine generator. Therefore, it is possible to provide an automatic control device for a gas turbine engine that can safely perform constant monitoring during operation and ensure safety in control emergencies.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention, FIGS. 2 to 5 are flowcharts of control in this invention, and FIG. 6 shows contents of stop and alarm in each subroutine shown in FIG. 5. 7 are diagrams showing an example of a fail-safe circuit of the output section in the present invention. 1, 6...detection means, 9...inspection switch, 1
1...I/O, 13...CPU, 14...ROM,
15...RAM, 17, 18, 19... Output interface, 17a... Ignition device, 17b...
Fuel cutoff valve, 17e...Fuel pump, 17f...
Starter, 20...Display section, 22...Switch element, 23...Resistor, 24...Emergency stop switch (output).

Claims (1)

[Scope of Claims] 1. A rotational speed detection means for detecting the rotational speed of a gas turbine engine; an ignition confirmation means for confirming that ignition has occurred in the combustion chamber of the gas turbine engine; and a lubricating oil in the gas turbine engine. After the gas turbine engine is started, the ignition confirmation means confirms whether or not ignition has occurred, and if it is confirmed that ignition has not occurred, after a predetermined period of time has elapsed, a first means for restarting the gas turbine engine after stopping the gas turbine engine; and when it is confirmed that ignition has occurred in the ignition confirmation, the rotation speed detection means determines whether or not the rotation speed has reached a first predetermined rotation speed; and when it is confirmed that the rotation speed has not reached the first predetermined rotation speed, a second means for restarting the rotation speed after a predetermined time has elapsed; Then, the third means for stopping the auxiliary equipment of the starter and ignition system of the gas turbine engine, and the oil pressure detection means after the auxiliary equipment is stopped, check whether the pressure of the lubricating oil is equal to or higher than a predetermined value. , a fourth means for restarting the hydraulic pressure when it is confirmed that it is below a predetermined value, and a fourth means for restarting the hydraulic pressure when it is confirmed that the oil pressure is above a predetermined value, and a fourth means for determining whether the rotation speed has reached a second predetermined rotation speed or not. and fifth means for restarting the engine after a predetermined time when it is confirmed that the rotation speed has not reached a second predetermined rotation speed. 2. The gas turbine according to claim 1, wherein sequence control is performed by a microcomputer, and individual output ports for control signals of various devices related to the operation of the gas turbine engine are grounded via resistors. Engine automatic control device.