JPH07107361B2 - Electric governor control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention adjusts the valve opening of a control valve for controlling the amount of steam through an electro-oil converter having a duplex coil. The present invention relates to an electric governor control device that controls the rotation speed of a turbine.

[Conventional technology]

Conventionally, as an electric governor for controlling the rotation speed of a turbine by using an electro-oil converter having a dual coil,
A configuration configured as shown in the figure is known. That is, in FIG. 2, reference numeral 10 is a rotation speed controller, 12 is an output controller, 14 is an opening controller, 16a and 16b are output cards, and 1
8 is an electro-oil converter, 20 is an auxiliary servo, 22 is a main servo, 24 is a control valve, and 26 is a turbine. An opening detection circuit 30 is provided via the differential transformer 28 in order to obtain an opening detection value as a feedback signal for the valve opening command for the auxiliary servo 20.

However, in the conventional electric governor configured as described above, the deviation signal between the rotation speed set value r ^* and the rotation speed detection value r ₁ is input to the rotation speed adjuster 10 and is obtained by the rotation speed adjuster 10. The output signal thus obtained and the output signal from the output controller 12 are added to obtain the valve opening set value d ^* . This valve opening setting value d
^* Is the valve opening detection value d ₁ calculated by the opening detection circuit 30
And the deviation signal Δd is input to the opening controller 14 to obtain the optimum valve opening command value Δd ₁ . However, the electric oil converter
Reference numeral 18 is a converter that obtains a hydraulic drive force for performing the valve opening adjustment operation of the control valve 24, and includes dual coils 17a and 17b. Output cards 16a and 16b for inputting the command value Δd ₁ are connected. In this way, the coils 17a and 17b of the electro-oil converter 18 are energized based on the valve opening command value Δd ₁ , and the auxiliary servo 20 and the main servo 22 are driven by the obtained hydraulic output of the electro-oil converter 18.
The valve opening of the control valve 24 is operated via. 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 opening degree detection circuit 30 to obtain the valve opening degree detection signal d ₁ . Since the auxiliary servo 20 is an integral type, the valve opening command value Δd ₁ is 0 V in the steady state, and the electro-hydraulic converter is
No current flows through each coil 17a, 17b of 18.

By the way, when the valve opening set value d ^* is larger than the valve opening detection value d ₁ , the valve opening command value Δd ₁ becomes a positive voltage value, and the coil 17a, 17b of the electro-hydraulic converter 18 receives Valve opening command value Δd ₁ a,
Δd ₁ b also becomes a positive current value, and the auxiliary servo 20 is set to the control valve 24
Operate in the opening direction. On the contrary, when the valve opening set value d ^* is smaller than the valve opening detection value d ₁ , the valve opening command value Δd ₁ becomes a negative voltage value, and the coils 17a and 17b of the electro-hydraulic converter 18 are supplied to the coils 17a and 17b. The valve opening command values Δd ₁ a and Δd ₁ b also have negative current values, and the auxiliary servo 20 is operated in the opening direction of the control valve 24.

In the electro-oil converter 18, the current values flowing in the coils 17a and 17b are added, and the operating speed of the auxiliary servo 20 is determined by the added current value. Therefore, assuming that the rated current of the electro-hydraulic converter 18 is I mA, the valve opening command values Δd ₁ a and Δd ₁ b share (1/2) I mA. At this time, the auxiliary servo 20
Operates at maximum speed Tsec. Ie output card 16
If both the coils a, 16b and the coils 17a, 17b of the electro-hydraulic converter 18 are in good health, the auxiliary servo 20 will operate the rated current I mA of the electro-oil converter 18
Sometimes it operates at maximum speed Tsec.

[Problems to be solved by the invention]

However, in the conventional electric governor described above, the pair of output cards 16a, 16b or the coil 17 of the electro-oil converter 18 is used.
If one of a and 17b is abnormal or broken, 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 is the electro-oil converter 18 The speed corresponding to the current (1/2) I mA of one coil of [
/ 2) Tsec] has a drawback that it is lowered. As a result, since the opening degree adjuster 14 is adjusted at the operating speed Tsec of the auxiliary servo 20, there is a drawback that the control response of the entire system deteriorates.

Therefore, an object of the present invention is to detect the case where the coil of the electro-hydraulic converter that is doubled is controlled by only one coil, or the case where it is controlled by two coils. When the control system is controlled by, it is possible to improve the response characteristics of the entire control system by automatically changing the set value of the opening controller to a value that matches the operating speed of one coil. To provide a governor control device.

[Means for solving problems]

An electric governor control device according to the present invention includes an electro-oil converter having a duplex coil, and controls a valve opening command value obtained by an opening controller to the duplex coil via an output card. An electric governor control device configured to control a turbine rotational speed by adjusting a valve opening degree of a control valve by operating a command to operate an electro-oil converter. It is characterized in that a circuit is provided for detecting that only one is in control operation and switching and selecting the gain set value of the opening degree adjuster.

In the above-mentioned electric governor control device, the circuit for switching and selecting the gain set value of the opening adjuster is composed of a proportional calculator, a gain selection switch circuit, and an OR gate, and a valve opening for controlling the duplex coils respectively. The self-diagnosis function is built into the output card that outputs the command value, and the abnormal signal generated from these output cards is input to the OR gate to operate the gain selection switch circuit to select the gain set value for the proportional calculator. It can be configured to do this automatically.

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

[Action]

According to the electric governor control device of the present invention, when the valve opening of the control valve for controlling the rotational speed of the turbine is adjusted by using the electro-oil converter having the duplex coil, both of the duplex coils are used. Only one coil can be selected by properly detecting when it is used and when only one is used, and switching the gain setting value of the opening controller that outputs the valve opening command value based on this detection. Even when is used, the control operation of the electro-hydraulic converter maintains the maximum operation speed, and the optimum control performance of the entire control system can always be obtained.

〔Example〕

Next, an embodiment of an 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 an embodiment of an electric governor control device of the present invention, showing a digital electric governor.
For convenience of explanation, the same components as those of the conventional electric governor shown in FIG. 2 are designated by the same reference numerals, and detailed description thereof will be omitted. Therefore, in the present embodiment, the opening degree adjuster 14 includes the proportional calculator 32 and a gain selection switch circuit for selectively changing the gain of the proportional calculator 32.
34 and the gain selection switch circuit by inputting an abnormal signal when the coils 17a, 17b of the electro-hydraulic converter 18 become inoperative.
It is composed of an OR gate 36 which performs a switching operation of 34. Therefore, the opening controller 14 is a CPU of the microcontroller.
The functions of the proportional calculator 32, the gain selection switch circuit 34, and the OR gate 36 can be configured by software. Also, in this case, output cards 16a, 16b
Consists of a D / A converter, has a self-diagnosis function, and when an abnormal condition is detected by self-diagnosis, the output signal as the valve opening command value Δd ₁ a, Δd ₁ b for each coil 17a, 17b is O mA.
Held in. Then, the output signals of the output cards 16a, 16b are OR gates 36 of the opening adjuster 14 as abnormal signals.
The circuit is configured to input to.

Therefore, when the electric governor is now in a steady state, in the gain selection switch circuit 34 in the opening degree controller 14, the a contact is closed and the b contact is opened, the gain set value G ₁ is selected, and the electro-hydraulic converter 18 is selected. The respective coils 17a, 17b are properly adjusted and held so that the operating speed of the auxiliary servo 20 is in the optimum state (Tsec). However, in one of the output cards 16a, 16b, when an abnormal state is detected, the abnormal signal Sa or Sb is input to the OR gate 36 in the opening adjuster 14, the gain selection switch circuit 34 based on this. The switching operation is performed to close the b contact and open the a contact, whereby the gain setting value G ₂ is selected. Therefore, in this case, the gain setting value G ₂ is such that when only one of the coils 17a and 17b of the electro-hydraulic converter 18 operates, the operating speed of the auxiliary servo 20 is the optimum state as in the steady state ( Tsec).

Further, when a plurality of control valves 24 are provided, a valve test circuit 38 is provided and connected so that a low value is selected for the deviation signal Δd between the valve opening set value d ^* and the valve opening detection value d _1. The low value selection circuit 40 described above is configured to be operated, and the open / close operation time of each control valve 24 can be monitored to detect disconnection of each coil 17a, 17b of the electro-hydraulic converter 18. Therefore, in this case, the disconnection detection signal S ₂ obtained by the valve test circuit 38 is connected and arranged so as to be input to the OR gate 36 of the opening degree controller 14 like the abnormal signals Sa and Sb, and the same as above. In addition, the gain setting value can be switched.

With this configuration, it is possible to properly detect that the electro-hydraulic converter is normally controlled by two coils, while the electro-hydraulic converter is normally controlled by only one coil, and the opening degree is adjusted. It is possible to switch the gain setting value of the device so that the auxiliary servo always maintains the maximum operating speed and optimally controls the control valve to smoothly control the rotational speed of the turbine.

〔The invention's effect〕

As is apparent from the above-mentioned embodiments, according to the present invention,
In an electric governor control device using an electro-oil converter having a double coil, when the electro-oil converter is controlled by only one coil, the abnormal state can be easily detected and the opening controller It is possible to automatically switch the gain setting value of 1 to maintain the operating speed of the auxiliary servo so as to be maximized at all times, and optimally maintain the 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 description of drawings]

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 a configuration of a conventional electric governor control device. 10 …… Rotation speed controller, 12 …… Output controller 14 …… Opening controller 16a, 16b …… Output card 17a, 17b …… Coil 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 set value r ₁ ...... Rotation speed detection value, d ^* ...... Valve opening set value Δd …… Deviation signal, d ₁ …… Valve opening detection Value Δd ₁ …… Valve opening command value Δd ₁ a, Δd ₁ b …… Valve opening command value Sa, Sb …… Abnormal signal S ₂ …… Disconnection signal G ₁ , G ₂ …… Gain setting value

Claims (2)

[Claims] 1. An electro-oil converter having a duplex coil,
The valve opening command value obtained by the opening controller is commanded to the duplex coil via the output card to operate the electro-hydraulic converter to adjust the valve opening of the control valve to control the turbine. In an electric governor control device configured to control the rotation speed, the opening adjuster, a proportional calculator, a gain selection switch circuit for selectively changing the gain of the proportional calculator, the gain selection switch circuit, A self-diagnosis function is provided in the output card that controls the duplication coil by outputting the valve opening command value while being configured with an OR gate that operates, and inputs an abnormal signal generated from these output cards to the OR gate. The electric governor control device is configured so that the gain selection switch circuit is operated to automatically select and switch the gain setting value for the proportional computing unit. 2. An electro-oil converter having a duplex coil,
The valve opening command value obtained by the opening adjuster is commanded to the duplex coil via each output card to operate the electro-hydraulic converter and adjust the valve opening of the control valve to control the turbine. In an electric governor control device configured to control the rotation speed, the opening adjuster, a proportional calculator, a gain selection switch circuit for selectively changing the gain of the proportional calculator, the gain selection switch circuit, A self-diagnosis function is provided in the output card that controls the duplication coil by outputting the valve opening command value while being configured with an OR gate that operates, and inputs an abnormal signal generated from these output cards to the OR gate. And a valve configured to operate the gain selection switch circuit to automatically perform gain setting value switching selection for the proportional calculator, and further to detect disconnection of the coil of the electro-hydraulic converter. The strike circuit is provided, configured to electrically governor control device in which to enter a disconnection signal generated from the valve test circuit to the OR gate.