SU966249A1 - Turbine controlling apparatus - Google Patents

Description

(54) DEVICE FOR REGULATING TURBINE

f The invention relates to thermal power engineering and can be used; but in turbine control systems to provide a bumpless mode switching.

There are known devices for regulating a turbine, containing a control signal generator, to the inputs of which power corrections are connected through a switch of a mode control unit, and a power setting device tl}

These devices do not provide a sufficiently high reliability of adjusting the turbine when changing modes because of the need for the operator to intervene to make an unstressed transition.

Closest to the invention, a turbine control device comprising a control signal generator, to which inputs a power sensor, a power corrector connected to the rotational speed sensor directly, and a power sensor through a statism change command generator, and a power setter equipped with control connecting entrances, the executive body connected to the output of the driver

$ of the main signal, and the mode control block 2}.

The disadvantage of this known device is somewhat lower reliability of turbine control when changing modes due to the lack of consideration of a number of factors. :

The purpose of the invention is to improve the reliability of the regulation of the turbine at

10 mode changes.

To achieve this goal, a sequence is entered into the device. but the connected null orgach and keys connected to the control inputs

15 of the power setting device and to the output of the mode control unit, the input of which is connected with the output of the statism changing command generator, and the zero-body output is connected with the output of the control signal generator.

The drawing shows a diagram of the device.

The device contains a driver 1. of a control signal, an electrohydrodical turbine executive 2; 3, a turbine power sensor 4, a statistics change command driver 5, a turbine speed power corrector 6, a turbine speed sensor 7.

power sensor 8, null organ 9, keys 10, mode control block 11.

The device works as follows.

In the steady state, the sum of the signals of a given power, the measured power, and the magnitude of the power correction in terms of the turbine rotation frequency is zero. The output of the driver 1 of the control signal is also a zero signal.

At the time of the occurrence of a perturbation, for example, from a change in the gain amplitudes, the equality is violated in the power corrector by the turbine speed (or when the corrector is completely turned off), a non-zero signal appears at the output of the control signal generator 1. Taking into account the inertia of the steam turbine, the measured turbine power remains almost unchanged for hundredths of a second, i.e. a turbine 3 with a power sensor 4 may serve for a short time as a good storage unit.

Thus, in view of the inertia of the turbine, at the output of the driver 1 of the control signaling machine, and hence at the first input of the zero-organ 9, there is a short time signal equal to the magnitude of the disturbance. At the output of a null organ, a corresponding signal appears. At the same time, the mode control unit 11 generates a short pulse (for example, a duration of 15-20 ms) transmitting the null-organ 9 signal through the keys 10 to the input of the power setting unit 8. The power setting device 8, made, for example, in the form of a reversible counter with a priority node at the input and a code-to-output voltage converter, begins to work out the signal of the null organ 9, added (or decrease) the power task so as to reduce the signal at the output of the generator 1 control signal to zero. The speed of the electronic setting device. allows you to do this in 5-10 ms of any signal size.

Thus, the automatic quick entry of the correction into the power setpoint 8 by the signals of the zero-organ 9 at the time of the appearance of the mode change signal allows an unstressed transition, i.e. keep value

power that exists at the output of the forglirovat 1 control signal before the signal of the change of regimes.

After the end of the pulse from the block

11 of the mode control, the action of the nullorgan 9 on the setter is blocked, and the device operates in the normal adjustment mode, and the priority node allows the setter to work out command commands from the operator or from adjacent systems. In the case of an unstressed transfer of a command from a null organ 9, having a higher priority, it blocks all other commands that have a lower priority from passing through the setpoint counter.

The technical and economic effect of this invention is to save the resource of powerful steam turbines.

by improving the quality and reliability of the bumpless transition when changing control modes.

Claims (2)

1. USSR author's certificate: 601438, cl. F 01 D 17/24, 1976. 2. USSR author's certificate No. 623984, cl. F 01 D 17/20, 1976. L eleven flpuSetfui ji P Manual