SU1562479A1 - System for automatic control of output power of power unit - Google Patents

Abstract

The invention is intended to increase the efficiency of operation of a power unit with a heat-generating turbine unit by testing high-frequency changes of the task without introducing disturbances into the mode of the steam generator. Two control units, two adders, an integrator, a functional converter, and a limiter for setting and changing heat extraction have been introduced into the power control system, which contains the electric power adjuster and the electric power and heat controllers. The integrator, covered by rigid feedback, forms a high-frequency filter and passes the high-frequency component of the electric power setpoint signal to the input of the heat removal controller without transmitting the effect to the steam generator. The low-frequency component is processed by changing the load without affecting thermal consumers, coming from the integrator output through the rate limiter and the adders to the input of the electric power regulator of the power unit. 1 il.

Description

The invention relates to a power system and can be used to regulate the electrical power of power units with thermal selection in turbine units, which allow a short-term change in the value of selection.

The purpose of the invention is to increase the efficiency of the power unit by testing the high-frequency changes in the task without introducing disturbances into the steam generator mode.

The drawing shows the scheme of the proposed control system.

The system contains an electric power setting device 1, a setpoint speed limiter 2, a power unit electric power regulator 3, an integrator 4, a heat extraction change limiter 5, a heat removal controller 6, a dynamic functional converter 7, the first and second comparison organs 8 and 9, respectively, and the first and second adders 10 and 1 1 respectively.

Limiter 5 of change in heat extraction is typical of a nonlinear element with controllable setpoints

SP R

Yu

4 1

with

maximum and minimum. The heat regulator 6 is performed in accordance with known rules. The functional transducer 7 is selected from typical dynamic links that have a resultant transient response as close as possible to the transient response in terms of the electrical power of the turbine unit under the step effect on the heat removal regulator.

In the proposed system, the control action from the electric power setting device 1 is supplied to the limiter 2 of the rate of setting the subsequent transmission to the electric power controller 3 through the high-frequency filter. The high-frequency filter is formed by the integrator 4, covered with rigid feedback by supplying the output signal P3d n to the input of the first comparison unit 8, to the input of which the signal P also comes from the setpoint 1 of electrical power. With respect to the integrator input, the integrator 4 with rigid feedback is a low-frequency filter, the output signal P3d, which through the limiter 5 is transmitted to the heat regulator 6. The limiter 5 is designed to control the value of Rzd.vtss so that the effect on the heat extraction regulator does not exceed the maximum allowable for the turbine unit heat changes. The constants, the maximum permissible changes in heat are determined by the 6th regulator 6. The RDD c input signal. ch.i vb ° dno signal RZD.Y.Ch. The limiter 5 is compared by the second comparison authority 9 in order to determine when the adjusting range of the heat regulator is exhausted and the part of the PZ task 6 h of the input signal, exceeding the capabilities of the selection regulator, is transferred for testing the electric power regulator of the power unit. . h. summed in the first adder 10 with the output signal of the integrator 4. The signal Rzd.hh from the output of the limiter 5 enters as a task to the input of the regulator 6. Simultaneously through the functional converter 7 it enters the input of the regulator 3 of the electric power of the power unit.

The system works as follows.

The RZD signal from the electric power setting device 1 is fed to the integrator 4, covered by hard feedback, the output low-frequency signal of which Rsd n. Is the output signal of the high-frequency filter, and the input high-frequency signal 7ЗЛ as the output signal of the low-frequency filter. The high-frequency signal is checked by the allowable values in limiter 5 and is supplied as a task to the input of heat regulator 6. The latter takes effect and changes the electric power of the power unit by changing the heat output without introducing disturbances into the operation of the steam generator.

At the same time, via the functional converter 7, the high-frequency signal of the RE 6 changes the setpoint of the electric power regulator 3 of the power unit so that the regulator 3 does not block the action of the heat regulator 6. Non-interference of the controller 3 is provided, since in this case the change in the actual power of the power unit and the output signal of the converter 7 coincide in time.

When the heat change in regulator 6 changes, the available control ranges of the RHF and RZA.C.Ch. are determined. in the direction of respectively increasing and decreasing heat extraction, and are transmitted to the limiter 5. If the signal Rsd8 h is outside the permissible limits, then the value of the RZD signal is determined in the second comparison organ 9. incl. which can not be worked out by the regulator 6. The signal RED in-h. from the output of the comparator body 9 is transmitted for testing to the electric power controller 3 of the power unit. Being summed in the first adder 10 with the output signal Rzd g „. integrator 4, it participates in the formation of the signal P h acting on the input of the limiter 2 of the task rate.

Thus, the system allows the power unit to work out high-frequency changes of the task without affecting the steam generator by changing the heat when the change in the parameters of the selected steam remains within acceptable limits.

In the low-frequency range, testing of the driving forces is provided by varying the load of the steam generator without affecting the heat consumers. The low-frequency signal from the output of the integrator 4 is fed to the input of the controller 3 through the limiter 2 of the task rate and the adders 10 and 11.

Claims (1)

Invention Formula The automatic power control system of a power unit with a heat-generating turbine unit, containing a generator of electrical power and regulators of electrical power and heat extraction, which, in order to increase the efficiency of the power unit by testing high-frequency changes of the task without introducing disturbances into the steam generator mode, it is equipped with two comparison bodies, two adders, an integrator, a functional transducer and limiters of the rate of assignment and selection change 0 heat, moreover, an electrical power adjuster and an integrator output are connected to the input of the first organ, the input of which is connected to the output of the first comparison organ, which is also connected to the input of the selection change limiter and to the input of the second comparison organ to which the selection change organ is also connected, connected to the inputs of the selection controller and the functional converter, the outputs of the selection controller are connected to the inputs of the limiter, the bodies of the selection selection, the outputs of the integrator and the second reference unit are connected us to the first adder, its output connected to the input of the limiter tempo specifying whose output together with output of the function generator connected to a second adder connected to its output electric power regulator. ; & - / " I n I P3d.fy. one  n i P3d.fy. Rzd.V.ch. Max Lf. P3d.fa min