SU1249175A1 - Arrangement for controlling a turbine - Google Patents

Description

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The invention relates to a power system and can be used in the automatic control of turbines.

The purpose of the invention is to increase reliability.

The drawing shows a diagram of the proposed device.

The device contains turbine regulator 1 2, turbine model 3, the outputs of which are connected to the inputs of regulator 1 and comparison element 4, also connected to the sensor 5 of the turbine operating parameter, and output / 1, ohm - to the first input of element 6 The knives, the output of which is connected to the input of the model 3, and the noise intensity meter 7 of the sensor 5, associated with the first input of the division element 8, connected by the output to the second input of the multiplication element 6. The transfer function of the turbine model 3 is identical to the transfer function of the turbine with a single transfer coefficient, and the input of the model 3 is connected via a scaling element 9 multiplied by the transfer coefficient of the turbine to the output of the regulator 1,

An adder Yu, an additional comparison element 1I, an additional multiplication element 12, a time counter 13, a memory element 14, a threshold element 15 and a setting unit I6 are entered into the device. The time counter 13 and a memory element 14 have control inputs 17 and 18, respectively. 16 is connected to the second input of the division element 8 and the input of the additional multiplication element 12 connected to the output of the time counter 13; the output of which is connected to the adder 10; The control input 17 of the time counter 3 is connected to the output of the additional element 15 comparing element 11, the inputs of which are connected directly and through a memory element 14 to the output of the model 3 of the turbine. The control input 18 of the memory element 14 is connected to the output of the threshold element 15, and the noise intensity meter 7 is connected to the division element 8 via an adder 10,

The device works as follows.

The signal from the regulator 1 controls the turbine 2, the output stabilized parameter of the turbine (for example, power) is measured by the sensor 5, the output signal

5. 2

which is reduced so as to suppress the noise in the sensor 5 signal to a minimum value. For this purpose, in the comparison element 4, the signal is continuously subtracted from the output signal of the sensor 5, which is obtained by multiplying in control element 9 the output signal of the turbine and the subsequent signal conversion in model 3, the transfer function of which is identical to the transfer function of the turbine with a single transmission coefficient. At the input of the model 3, a converted error signal is generated from the comparison element 4 by multiplying in element 6 the element 4 signal arriving at one input by the signal arriving at its other input from the output of the division element 8 generating a gain signal as the ratio arriving at one the input of the sensor signal 16 to the adder signal Y arriving at its other input. An additional multiplication element 12 forms at the input of the adder 10 a signal on the product of the setpoint signal 6 arriving at its input the current time signal from the time counter 13; In the threshold element 15, the mismatch signal of the additional element 1 is compared with a threshold value, which is chosen according to the condition of exceeding the dead zone for measuring random changes in the magnitude of the reconstructed signal, for example, equal to the variance of these random changes. If the error signal between the signal at the current value of the restored model 3 signal and the signal stored in the memory of the signal of the memory element 14 is greater than the threshold value, then the threshold element 15 simultaneously generates signals to the control input 17 of the time counter 13, causing the counter to reset. 13 time, and to the control input 18 of the memory element 14, causing the current value of the restored value to be memorized, instead of the value stored in the memory. Otherwise, the threshold element 15 does not generate an output signal cash ..

The adder 0 supplies the input of the element 8 dividing the signal by the sum of the signals arriving at its inputs by the intensity of the sensor noise from measurement 3

and a signal of the multiplication element 12.

The output of setpoint 16 is adjusted before switching on the control loop to operation by pre-measuring the variance of random variations of the parameter being stabilized.

In a number of turbine control modes, the turbine operation parameter is stabilized on. certain constant level. At the same time, the specified parameter remains constant for relatively long time intervals and only occasionally changes randomly with dispersion QJ, and the parameter sensor signal contains noise with constant intensity V. Gain factor k (t) of the sensor output signal restorer in the case of the mentioned modes 249175 4 m the stabilization of the turbine operation parameter is determined from the ratio

k (t)

Qe

V + 0 "t

where t About - time.

Therefore, in the considered case, there is no need to constantly measure the dispersion, but it is enough to measure it once and build the signal point by 0 before turning on

control loop in operation.

Thus, using the comparison element 11, the memory element 14 and the threshold element 15 provide the required law of formation of the gain of the reducing agent with an initial zero time with random 1-changes of the stabilized operating parameter of the turbine. The overall design of the device is simplified by

exclusion of a complex dispersion meter.

Claims (1)

(56) Copyright certificate of the USSR No. 840800, cl. F 01 D 17/20, 1979. / 54) DEVICE FOR REGULATING A TURBINE, containing a regulator whose input is connected to the output of the turbine model, and the output to the turbine and one of the model inputs, a comparison element whose inputs are connected to the turbine operation parameter sensor and the output of the model, and the output is to one of the inputs of the multiplication element, the second input of which is connected to the output of the division element, and the output is connected to the second input of the model, and the sensor noise intensity meter associated with the input of the division element, characterized in that, for the purpose increase reliability about o equipped with a time counter and a memory element with control inputs, an adder, a threshold element, a setter and additional elements for comparison and multiplication, the adder being installed in a communication line of a noise intensity meter, and the input of the division element also connected to the setter connected to the input of the adder an additional element of multiplication, the inputs of which are connected to the master and to the time counter, the control input of the latter together with the control input of the memory element is connected to the output of the threshold element, input to the output of an additional comparison element connected by inputs to the output of the model directly and through a memory element.