SU585300A1 - System of steam power unit automatic regulation - Google Patents

Description

The drawing is a schematic diagram of this system.

It contains a generator 1, speed-i-most proportional regulator 2 speed of the turbine 3, control valves 4 tur-5 bins, boiler 5, sensor 6 of the mains frequency deviation, element 7 of the dead zone type and block 8 of the level limitation, dynamic link 9 types of real derivative,; stabilizer l6 of the leading operating parameter “on the boiler and stabilizers of the slave parameters i (conditionally shown in the drawing together with i. the stabilizer U), dynamic control organ C, regulator 12 of the steam pressure and red turbine, regulator 13 of the pery-us valves 4 turbines 3 and block 14 mode selection.

The output signal of the dynamic link is equivalent in shape and standard to the main Cig 2t bank, which is located at the input of the pressure regulator and the valve position regulator with mixing of the control valves of the bin under the action of the speed regulator, which eliminates counter-action adjusting the iJS pa speed to the pressure regulator (valve valves) practically at any small disturbance in the system and provides the possibility of involving the power unit to the regulator | frequency, both in emergency and AOR in normal modes.

If the power unit is only involved in emergency frequency regulation, the output of the frequency deviation sensor includes, with element 7 of the type 7, an insensitive zone of 1 with an adjustable zone value.

When the operation mode of the power unit (with nominal or sliding vapor pressure) changes, the dynamic characteristics of the power unit change, therefore, the dynamic adjustment body 11 of the compensating signal is inserted into the control system 40.

When the frequency deviation at the terminals of the generator 1 by the value of D f regulator 2. By the speed of turbine 3, its regulating valves 4 are moved. In this case, the power of the power unit changes by an amount where S is the statistics of the turbine speed controller and the vapor pressure in front of the turbine is deflected. back to the boiling capacity of the boiler 5. At the same time, a signal appears at the output of sensor 6 and rejects the frequency, through the element 7 of the type of dead band and the block 8 of the limit S, the level is fed to the dynamic link 9 and stabilized% 1 of fuel consumption, pi -, heavy water and air. The adjusted body 11 dynamic adjustment. the signal from the output of the gynemic link 9 poo-g

blunt to the inputs of the pressure regulator 12 and the regulator 13 of the position of the turbine regulating valves: and compensates for the signals that are proportional to the deviation of the parameters regulated by them. As a result (in spite of the existing deviation of the parameter (pressure or position of the control valves, the turbine signal is present at the output of the regulators, and the control valves 4 of the turbine 3 receive a signal only from the output of the speed regulator 2).

Under the action of a signal proportional to the frequency deviation applied to the input of the stabilizer of the leading parameter, the performance of the boiler 5 is changed; if the gains are equal over the channel and the controller channel. 2 turbine speeds At the end of the transition process on the boiler, the change in jero capacity is equal to the change in turbine load, and the pressure (or regulating rivets, turbines) returns to its original value.

After the change process is over, the compensating signal disappears, and the pressure regulator (or valve position regulator) is automatically entered into the renter and ensures that the corresponding parameter is maintained in normal operation. The & iop mode of operation is performed by block U4.

The system provides automatic change of power unit capacity in accordance with the needs of the power system and is applicable for both normal and emergency frequency control. At the same time, it ensures the frequency pickup of the power unit in no worse than systems with astatic pressure contours or power sheds through the whole power unit. The main part of the power change with frequency change occurs with a constant turbine time.

This system is simple in real life and does not require additional equipment with devices to limit the parameters.

Equipping power units with direct flow and mi-boilers of this system allows you to improve the quality of the energy fleet operation on the insulated load both at nominal and under steam conditions.

Claims (2)

1. Automatic control on block power plants, Energy series abroad, BTI ORGRES, Moscow, I960, p. 6-11. 2. USSR author's certificate number 442312, cl. F 01 K 7/24, 1972.