SU941638A1 - System for automatic control of power installation - Google Patents

Description

(54) AUTOMATIC REGULATION SYSTEM FOR POWER UNIT

one

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

The systems of automatic control of the power unit are known, which contain power regulators of nominal and minimum steam pressure, connected through a mode selector unit to the control unit of the turbogenerator control unit 1.

However, these systems cannot be used in power units with two turbo-Q generators connected to a common reactor.

Also known is a system for automatic control of a power unit with two turbo generators connected to a common reactor, power regulators, 15 nominal and minimum steam pressure, connected through a mode selector unit and a load distribution unit with units controlling turbine generators with minimum and maximum signaling devices 20 loads, a regulator of economic load distribution with a power setting unit, an integrator and power sensors of turbo-generators 2.

A disadvantage of the known system is its somewhat reduced reliability and accuracy due to the need to install two sets of regulators - according to the number of turbo generators, which complicates the system and prevents the reservoir pressure from being maintained in front of the turbo generators without load imbalance, otherwise the stability is parallel operation of two pressure regulators.

The purpose of the invention is to increase reliability and accuracy.

The goal is achieved by adding a comparison element, a logic element and an integrator control unit to the system, and power sensors and an integrator are connected to the input of the comparison element whose output is connected to the input of the load distribution unit, the control units of the turbogenerator control unit are connected to the input of the distribution unit load and to the input of the logic element, which is also connected by its input to the output of the load sharing unit and the integrator control unit, and the output to the input house integrator.

The regulator of the economic load distribution is connected to the input of the integrator control unit.

Minimum and maximum load alarms are connected to the input of the load sharing unit.

FIG. 1 is a diagram of a system for automatic control of a power unit with two turbine generators connected to a common reactor; in fig. 2 - type of load distribution; in fig. 3 - the characteristic of a nonlinear element.

The circuit contains power regulators 1, 2 and 3, nominal and minimum steam pressure, unit 4 for selecting their operating mode, which transmits a signal from the output of the selected regulator to the switching input of the load distribution unit 5 between the turbo-generators. The output of unit 5 is connected via control units 6 and 7 to the inputs of devices 8 and 9 for regulating turbo-generators. Each control unit contains a control switch "automatic control mode - remote control mode and a remote control unit (not shown).

Signaling devices 10, 11 and 12, 13, respectively, are triggered when one of the turbogenerators reaches the minimum or maximum permissible load.

Logic element 14 connects to the input of the integrator 15 the output of the integrator control block 16, similar to the control blocks 6 and 7, if both control blocks 6 and 7 are in the "automatic control mode" position, or the output of the block 5, if at least one of the blocks 6 or 7 is in a different position. The output of the integrator 15 defining the difference in power of the turbo-generators is compared with the signals from the sensors 17 and 18 of the power of the turbo-generators in the reference element 19.

The economic distribution of loads between the turbogenerators is provided by connecting to the integrator 15 through the control unit 16 of the economic distribution controller 20, at the input of which the signal from the integrator output is compared with the signal of the nonlinear element 21 that specifies the difference between the loads between the turbine generators as a function of the signal from the output unit setting unit 22 (the signal of the actual power of the power unit can be used as this signal). An exemplary economic distribution of the loads NI and N2 between two turbo-generators depending on the total power N (j of the power unit is shown in Fig. 2. In Fig. 3, the characteristic of this distribution is given the characteristic of the nonlinear element 21. The system works as follows. When blocks 6 and 7 of the control devices of the turbogenerators are in the "automatic control mode" position, the signal from the output of the regulator 1, 2 or 3, selected by block 4, goes to block 5. If the actual load distribution (output signals sensors 17, 18) correspond to that specified by the integrator 15, as evidenced by the signal at the output of the comparison element 19, the signal from the output of the block 5 passes simultaneously to the inputs of the devices 8 and 9 for adjusting the turbo-generators.Otherwise, the signal for each pipe generator is corrected with the signal from the output of the comparison element 19, which ensures that the turbogenerator loads correspond to a given distribution, which is installed on the integrator 15 by remote control through the block 16.

If at least one of the control units 6 or 7 is in the position "remote control mode, the signal from the output of unit 4 is fed to that turbo generator, the control unit of which is in the position" automatic control mode. The logic element 14 then disconnects from the input of the integrator 15 the output of the control unit 16 and connects to it the output of the block 5, a signal on which, formed taking into account the signal at the output of the comparison element 19, ensures the installation of the integrator 15 in accordance with the actual load distribution between the turbine generator. mi Thus, the inclusion of the second turbo-generator in the automatic control mode will occur unstressed, while preserving the load distribution that existed before the switching-on moment.

The connection of the regulator 20 by the block 16 to the integrator 15 ensures the installation at the last m of the signal corresponding to the load difference of the turbogenerators, given from the conditions of economic distribution (Fig. 3). This difference is formed by the non-linear element 21 from the signal of the unit 22 of the power unit.

If one of the turbogenerators has exhausted the adjustment range, as evidenced by the triggering of the alarms 10 or 12 (respectively 11 or 13), the redistribution of loads in block 5 is blocked, and the signal for changing the load is realized by another turbogenerator.

The economic effect is determined by

improving the quality of pressure control, as well as increasing the reliability of the automatic control system and facilitating its maintenance.

Claims (3)

Invention Formula i. The system of automatic control of a power unit with two turbine generators connected to a common reactor, containing regulators of power, nominal and minimum vapor pressure, connected through a mode selector unit and a load distribution unit with control units of turbogenerator control devices equipped with minimum and maximum load signaling devices, a regulator economic load sharing with a power setting unit, an integrator and power sensors of turbo-generators, characterized in that overestimations of reliability and accuracy, a comparison element, a logic element and an integrator control unit are added to the system, and power sensors and an integrator are connected to the input of the comparison element, the output of which is connected to the input of the load distribution unit, the control units of the turbogenerator control devices are connected to the input of the load distribution unit and to the input of the logic element, which is also connected with its input to the output of the load sharing distribution unit and the integrator control unit, and the output to the input ntegratora. 2. The system according to claim 1, wherein the economic load balancer is connected to the input of the integrator control unit. 3. The system of PP. 1 and 2, characterized in that the minimum and maximum load signaling devices are connected to the input of the load distribution unit. Sources of information taken into account in the examination 1. Davydov N. I. and others. The system of automatic control of the frequency and power of block TPPs with flow boilers. - “Thermal Engineering, 1979, № 8, p. 3-6. 3. P. Salmipen et al. The main control loops of the NPP Loviisa in Finland Thermal Power Engineering, 1976, No. 8, p. 7-14.