SU892028A1 - Apparatus for controlling group of parallelly operating pumps with turbodrives - Google Patents

Description

I

The invention relates to a power system and can be used to control a group of pumps (or blowers) with turbo drives and components of a power unit of a thermal power plant that operate in parallel on a common network.

There are known devices for regulating groups of pumps connected in parallel with drives, which contain sets and individual controllers for each drive connected to it, connected at the input with a corresponding sensor of an adjustable parameter, and at the output with an actuator of the corresponding drive 1.

However, the devices provide joint control of a group of parallel operating pumps within the control range. If it is necessary to change the number of operating pumps in a group, these devices do not allow for a high degree of automation and reliability.

The closest to the proposed technical essence and the achieved result is a device for regulating a group of parallel-connected pumps with turbo drives, containing a master and connected to it individual controllers for each turbo drive, connected at the input with the corresponding sensor of the adjustable parameter and the integrator, and at the output with the same integrator and actuator

 corresponding turbo drive 2.

A disadvantage of this device is the reduced reliability of operation of the group of pumps, since it is not possible to automate the connection of the new pump to the group of workers.

The purpose of the invention is to increase the reliability of the group of pumps.

The goal is achieved in that the device additionally contains a maximum extraction unit, a pulse generator and individual comparison blocks and prohibition blocks that are individual for each Turboprive, each sensor of an adjustable parameter additionally connected to the corresponding comparison block and maximum separation unit, the output of which is connected through comparison blocks the inputs of the prohibition blocks, which are also connected to the setpoint generator and the pulse generator, and the outputs of the prohibition blocks are connected to the integrators.

The drawing shows a diagram of the device in relation to a group of three parallel-connected pumps with turbo drives.

The device contains individual for each turbine drive regulators 1 - 3, the inputs of which are connected to the control device 4, the adjustable parameter common sensors 5-7 and the integrator 8-10, common to all the regulators, and the outputs are connected through switching elements 11-13 to the actuators 14 -16 corresponding turbo drive and to integrators 8-10. The inputs of the comparison blocks 17-19 are connected to the sensors 5-7 and the maximum allocation unit 20 common to the whole device, and the outputs are connected to the inhibit blocks 21-23 through 23. The output of the setter through the prohibition blocks, the output of each of which is connected to the generator of a pulse generator 24, is connected to the input of the integrators 8-10.

The device works as follows.

The shock-free connection of the output circuits of the regulators 1-3 to the actuators 14-16 is provided by applying to the input of the integrators 8-10, through the switching elements, 11-13 pulses from the output of the regulators arising from the mismatch between the set and the current values of the controlled parameter and disappearing at equality of well; 1Ü algebra jQii-iccKofi of the SUM of signals from the generator 4,; i.; jГЧ11К1)) 5-7 and the integrator. When the device is connected by a command given to e. 1G - 13 by the machinist or authpish control system, originated; iT switching the output circuits of the regulator from the integrators to the actuators 14-16, having sat down the regulators not previously included in the mode of maintaining a constant value of the controlled parameter, and gives permission to turn on the prohibition block.

In the case of signaling signals of a signal of a 1) signal, the signal from the sensor of the controlled variable; ) am, tr: 1. related to the connected ai-regatta, one of the signals from similar sensors of other units, which are sent to the comparison blocks 17-19 through the Eischelem 20 and maximum, the output of the comparison unit receives a signal to turn on the prohibition block. Signal output

4 through a prohibition unit, controlled by a generator of 24 pulses, is fed to the controllers of regulators 1-3 through an integrator.

The rate of change of the controlled parameter of the connected unit is determined by the set pulse frequency from the generator 24. With equal signals compared in blocks 17-19, the prohibition unit breaks the integrator control circuit and the device stops working.

The invention allows the plug-in unit to be automatically brought to a predetermined load level, to align the adjustable parameters with the required quality of the transient process, which contributes to a more reliable operation of the group of units operating in parallel.

Claims (2)

1. USSR author's certificate number 727874, cl. F 04 C 27/00, 1973. 2. Kvasha N.V. and others. System of automatic power control of a power unit of 1200 mW. Works CKTI. Issue 147, L., 1977, p. eight.