JPS63302104A - Electrical governor control device - Google Patents

Abstract

PURPOSE:To maintain control performance at an optimum condition by detecting the operating condition of a duplexed coil so as to switch over the set value of the gain of an opening governor when a valve opening command value is given to an electricity-oil converter with the duplexed coil so as to govern the opening of a control valve for controlling the revolving speed of a turbine. CONSTITUTION:The output signal from a revolving speed governor 10 obtaining the deviation of revolving speeds is added to the output signal from an output governor 12 so as to obtain the set value for valve opening, and the aforesaid set value for valve opening is thereby compared with the detected value for valve opening by an opening governor 14. In this place, a valve opening command value depending on the deviation in signal for valve opening is obtained so as to be applied to an electricity-oil converter 18 with duplexed coils 17a and 17b for allowing the hydraulic output thereof to control the valve opening of a control valve 24 through a main servo 22. In this case, the opening governor 14 consists of a proportion computing element 32, a gain selection switch circuit 34 changing selectively the gain thereof, and of an OR gate which inputs the abnormal signal in case each of the coils 17a and 17b becomes inoperative so as to switch over the circuit 34.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a method of controlling the valve opening of a control valve that controls the amount of steam through an electro-hydraulic converter having duplicated coils. The present invention relates to an electric governor control device that controls the rotation speed of a turbine.

[Prior art] Conventionally, as an electric gabble that controls the rotation speed of a turbine using an electro-hydraulic converter having duplicated coils, a second
A device configured as shown in the figure is known. That is, in FIG. 2, reference numeral 10 is a rotation speed regulator, 12
is an output regulator, 14 is an opening regulator, 16a, 16bE;
Output card, 18 is electro-hydraulic converter, 20 is auxiliary servo,
22 is a main servo, 24 is a control valve, and 26 is a turbine. Note that an opening detection circuit 30 is provided to the auxiliary servo 20 via a differential transformer 28 in order to obtain an opening detection value as a feedback signal for the valve opening command.

However, in the conventional electric governor configured in this way, the rotation speed setting t, t, * and the rotation speed detection value r
1 is input to the rotation speed regulator 10, and the obtained output signal from the rotation speed regulator 1oT is added to the output signal from the output regulator 12 to obtain the valve opening setting value d1. This valve opening degree setting [d is calculated by comparing the valve opening degree detection value d1 calculated by the abdominal opening detection circuit 30, and inputting the deviation signal Δd to the opening degree controller 14 to determine the optimum valve opening degree command value. Obtain Δd1. However, the electro-hydraulic converter 18 is a converter that obtains hydraulic driving force for adjusting the valve opening of the control valve 24, and is equipped with 2V coils 17a and 17b, and each coil 17a and 17b has a On the other hand, output cards 16a and 16b for inputting the valve opening command value Δd1 are connected. In this way, the coils 17a, 17t) of the electro-hydraulic converter 18 are energized based on the valve opening command value Δd1, and the obtained hydraulic output of the electro-hydraulic converter 18 is used to control the auxiliary servo 2.
0 and U through the main servo 22! II Operate the Ij valve 24 the nth time. In this case, the position of the auxiliary servo 20 is detected by the differential transformer 28, and this detection signal is input to the melon detection circuit 30 to obtain the valve opening detection value F3 d 1. Note that since the auxiliary servo 20 is of an integral type, the valve opening command value Δd1 is O■ in a steady state, and no current flows through each coil 17a, 17b of the electro-hydraulic converter 18.

By the way, when the valve opening rlX setting value d* is larger than the valve opening detection value d1, the valve opening command value Δd1 becomes a positive voltage value, and the valve opening to each coil 17a, 17b of the electro-hydraulic converter 18 is The degree command values Δd1a and Δd1b also become positive current values,
The auxiliary servo 20 is operated in the direction in which the control valve 24 is opened. Conversely, when the valve opening degree set value d1 is smaller than the valve opening degree detection value d1, the valve opening degree command value Δd1 becomes a negative voltage value, and the valve opening degree to each coil 17a, 17b of the electro-hydraulic converter 18 is The degree command values Δd1 a and Δd1b also become negative current values, and the auxiliary servo 20 is operated in the opening direction of the 1I11 control valve 24 .

The electro-hydraulic converter 18 includes each coil 17a.

The current values flowing through the auxiliary servo 2o are added together, and the operating speed of the auxiliary servo 2o is determined by the added current value. Therefore, if the rated current of the electro-hydraulic converter 18 is I mA, then
The valve opening command values Δd1a and Δd1b are each (1/2
) I mA. At this time, auxiliary servo 20
operates at a maximum speed T sec. That is, each coil 1 of the output cards 16a, 16b and the electro-hydraulic converter 18
If both 7a and 17b are in good condition, the auxiliary servo 20 will reach the maximum speed T at the rated current I mA of the electro-hydraulic converter 18.
It operates in sec.

[Problem that the invention seeks to solve]

However, in the conventional electric governor mentioned above, -
- Pair of output cards 16a, 16b or electro-hydraulic converter 18
coil 17a.

171) is abnormal or disconnected, the electro-hydraulic converter 18 will be controlled only by a single coil, and the maximum operating speed of the auxiliary servo 20 at this time will be the same as that of the electro-hydraulic converter 18. There is a drawback that the speed decreases to approximately (1/2) Tsec corresponding to the current (1/2) I mA of one coil. As a result, since the opening adjuster 14 is adjusted at the operating speed T Sec of the auxiliary servo 20, there is a drawback that the control response of the entire system is poor.

Therefore, an object of the present invention is to detect when the duplicated coils of an electro-hydraulic converter are controlled by only one coil, or when they are controlled by two coils, and to By configuring the setting value of the opening adjuster to be automatically changed to a value suitable for the operating speed of one coil, the response characteristics of the entire control system can be improved. To provide a governor control device.

[Means for solving problems]

The electric governor control device according to the present invention includes an electro-hydraulic converter that connects the duplex coil, and sends the valve opening command value obtained by the opening adjuster to the duplex coil through an output card. In an electric governor control device configured to issue a control command to operate an electro-hydraulic converter and adjust the valve opening of a control valve to control the rotational speed of a turbine, the electric governor control device is configured to control the rotation speed of a turbine by controlling the rotation speed of a turbine. The present invention is characterized in that a circuit is provided to detect whether both or only one of the opening controllers is in a controlled operation and to switch and select the gain setting value of the opening regulator.

In the above-mentioned electric governor control device, the circuit for switching and selecting the gain setting value of the opening regulator is composed of a proportional calculator, a gain selection switch circuit, and an OR gate, and the circuit controls the valve opening to respectively control the duplex coil. The output cards that output command values have a built-in self-diagnosis function, and the abnormal signals generated from these output cards are input to the OR gate to operate the gain selection switch circuit and select the gain setting value for the proportional calculator. Can be configured to do so automatically.

In this case, a valve test circuit for detecting a disconnection of the coil of the electro-hydraulic converter may be provided, and a disconnection signal generated from the valve test circuit may be input to the OR gate.

[Effect]

According to the electric governor control device according to the present invention, when adjusting the valve opening of a control valve that controls the rotation speed of a turbine using an electro-hydraulic converter having dual coils, both dual coils By properly detecting when one coil is used and when only one coil is used, and selecting the gain setting value of the opening regulator that outputs the valve opening command value based on this detection, only one coil is used. Even when the electro-hydraulic converter is used, the control operation of the electro-hydraulic converter maintains the maximum operating speed, and the optimum control performance of the entire control system can always be obtained.

〔Example〕

Next, embodiments of the electric governor control device according to the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 is a system diagram showing one embodiment of the electric governor control device of the present invention, and shows a digital electric governor.

For convenience of explanation, the same reference numerals are given to the same components as those of the conventional electric governor shown in FIG. 2, and detailed explanation thereof will be omitted. However, in this embodiment, the opening regulator 171 includes a proportional calculator 32, a gain selection switch circuit 34 for selectively changing the gain of the proportional calculator 32, and each of the electro-hydraulic converter 18. ”Il 17a.

17b is inoperative, and an OR gate 36 which inputs an abnormal signal to switch the gain selection switch circuit 34.

Therefore, this opening degree adjuster 14 is ? It is configured by the CPU of the microcontroller, and the functions of the proportional calculator 32) gain selection switch circuit 34 and OR gate 36 can be configured by software. Further, in this case, the output cards 16a and 16b are composed of D/A converters, and have a built-in self-diagnosis side, so that when an abnormal state is detected during self-diagnosis, each coil 17a is activated.

Valve opening command value Δd1a for 17b.

The output signal as Δd1b is held at OmA. And this output card 16a.

The output signal of 16b is used as an abnormal signal by the opening adjustment controller 1.
The circuit is configured so that the signal is input to the OR gate 36 of 4.

Therefore, when the electric governor is in a steady state, the gain selection switch circuit 34 in the opening regulator 14 closes the a contact and opens the b contact, selects the gain setting value G1, and selects the gain selection switch circuit 34 in the opening regulator 14. The state 1 (Tse
It is adjusted and maintained so that c).

However, when an abnormal state is detected in one of the output cards 16a, 16b, the abnormal signal Sa or sb is inputted to the OR gate 36 in the opening adjuster 14, and the gain selection switch circuit 34 is activated based on this. The switching operation closes the b contact and opens the a contact, thereby selecting the gain setting fIiG2.

Therefore, in this case, the gain setting value G2 is
When only one of the eight coils 17a and 17b operates, the operating speed of the auxiliary servo 20 is set to a value that provides the optimum state g (Tsec) as in the steady state.

In addition, when a plurality of control valves 24 are provided, a valve test circuit 38 is provided, and the valve opening degree setting value d8 and the valve distance detection value d
1, the low value selection circuit 40 is configured to operate a low value selection circuit 40 which is connected and arranged to select a low value with respect to the deviation signal Δd from 1. Disconnection of wires 17a and 17b can be detected. Therefore, in this case, the disconnection detection signal S2 obtained from the valve test circuit 38 is connected and arranged so as to be input to the OR gate 36 of the opening regulator 14 in the same way as the abnormal signals Sa and Sb, and the same procedure as above is performed. It can be configured to perform a gain setting value switching operation.

With this configuration, it is possible to properly detect that the control operation is now performed with only one coil, whereas the electro-hydraulic converter normally operates with two coils, and adjust the opening. Switch the gain setting of the device so that the auxiliary servo always maintains the maximum operating speed! Perform optimal control of the BLJ valve,
The rotation speed of the turbine can be controlled smoothly.

(Effects of the Invention) As is clear from the embodiments described above, according to the present invention,
In an electric governor control device using an electro-hydraulic converter with dual coils, when the electro-hydraulic converter performs control operation with only one coil, an abnormal state can be easily detected, and an opening adjuster can be used. By automatically switching the gain setting value of the auxiliary servo to maintain the operating speed of the auxiliary servo at the maximum value, it is possible to maintain optimal control performance of the control valve that controls the rotational speed of the turbine.

Although the preferred embodiments of the present invention have been described above, it goes without saying that various design changes can be made without departing from the spirit of the present invention.

[Brief explanation of the drawing]

FIG. 1 is a system diagram showing an embodiment of an electric governor control device according to the present invention, and FIG. 2 is a system diagram showing the configuration of a conventional electric governor control device. 10... Rotation speed regulator 12... Output regulator 14.
...Opening degree regulators 16a, 16b...Output cards 17a, 17b -Sill 18...Electro-hydraulic converter 20...Auxiliary servo 22.
...Main servo 24...Control valve 26...Turbine 28...Differential transformer 30...Opening detection circuit 32...Proportional calculator 34...Gain selection switch circuit 36...OR Gate 38...Valve test circuit 40
...Low value selector r*...Rotation speed setting value r1...
・Rotation speed detection value d... Valve opening setting value Δd... Deviation signal dl... Valve opening detection value Δd1... Valve opening command value Δd1a, Δd1b... Valve opening command value sa ,sb・
...Abnormal signal S2...Disconnection signal G1. G2...gain setting value

Claims (3)

[Claims] (1) The electro-hydraulic converter is equipped with an electro-hydraulic converter having a duplex coil, and controls the valve opening command value obtained by the opening regulator via an output card to the duplex coil. In the electric governor control device configured to control the rotation speed of the turbine by operating the control valve and adjusting the valve opening of the control valve, both of the duplex coils of the electro-hydraulic converter and only one of the duplex coils are controlled. An electric governor control device, comprising: a circuit for detecting that the opening degree adjuster is present, and switching and selecting a gain setting value of the opening degree adjuster. (2) In the electric governor control device according to claim 1, the circuit for switching and selecting the gain setting value of the opening regulator is composed of a proportional calculator, a gain selection switch circuit, and an OR gate, and has a double A self-diagnosis function is built into the output card that outputs the valve opening command value that is used as a control command for each control coil, and the abnormal signals generated from these output cards are
Input it to the R gate and operate the gain selection switch circuit,
An electric governor control device configured to automatically select a gain setting value for a proportional calculator. (3) In the electric governor control device according to claim 2, a valve test circuit is provided to detect disconnection of the coil of the electro-hydraulic converter, and a disconnection signal generated from the valve test circuit is input to the OR gate. An electric governor control device configured as follows.