UA60176A - Method for controlling technological parameters of turbo-mechanisms - Google Patents

Abstract

A method for controlling technological parameters of turbo-mechanisms includes the use of electroenergy parameters (voltage, current, frequency) and on the base of calculation of those the formation of control actions. To obtain real technological characteristics of turbo-mechanism one applies electro-mechanical parameters of electric drive (electromagnetic momentum and rate of electromotor), those are formed by a frequency transformer with vector control. To realize the control algorithm, calculations are performed by absolute values.

Description

Description of the invention

The invention relates to objects of automatic control of technological parameters of turbomechanisms 2 by means of a frequency-regulated electric drive with vector control.

There is a known method of controlling the technological parameters of pumps (B.S. Leznov, Znergosberezhenie and adjustable drive in pump installations.-M.-Yahorba.-1998.-S.Yu4) in which the quantitative pressure characteristics of the turbomechanism are regulated by the automatic control system (ACS), using signals from sensors of controlled quantities (pressure, productivity) (Analog).

The analogue of the claimed invention coincides with the fact that the technological parameters are regulated by changing the rotation frequency of the turbomechanism according to the technological requirements, by comparing the set value with the actual one obtained from the sensors.

The disadvantage of this method is that primary converters (sensors) of controlled values are used to control the technological parameters, which are directly placed in the control zone and leads to a decrease in the reliability of the system and the complexity of its maintenance.

Also known is the method of controlling technological parameters of turbomechanisms (M.V. Rogoza. Creation of systems of automatic regulation by parameters of drives of turbomechanisms of mines at the request of an autonomous source// Technical electrodynamics. - 2001. - Mo5 - P.42-44), in which the frequency of rotation of the electric motor regulated by a frequency converter, according to the algorithm in the computer unit for which the electric power signals come from the current, voltage and frequency sensors installed in the power supply circuit of the electric motor. The calculation algorithm is based on the modular vector values of electrical energy signals, resulting in valid quantitative and pressure characteristics of the turbomechanism. (Prototype).

With the claimed invention, the prototype coincides with the following characteristics: to obtain the actual productivity or pressure of the turbomechanism, indirect measurement data (voltage, current, frequency) are calculated.

The disadvantage of this method is that the information for the implementation of the algorithm comes from external sensors, which "complicates the algorithm of the system as a whole, reduces the speed of operation.

The invention is based on the task of improving the efficiency of the method, simplifying the design, increasing the reliability and speed of the system.

The task is achieved due to the fact that in the method of controlling the technological parameters of turbomechanisms for the implementation of the algorithm, the signals are received directly from the frequency converter with cha vector control, the principle of operation of which involves obtaining the electromechanical parameters of the electric drive (electromagnetic moment and speed of the electric motor), with the help of which - - calculation according to the given algorithm by absolute values. at

The structural diagram of the SAR implementation of the method is shown in Figure 1.

З The method of controlling technological parameters of turbomechanisms with an adjustable electric drive о is implemented as follows. When changing the operating modes of the turbomechanism (TM) in accordance with the requirements of the technological process, the electrical power parameters of the asynchronous electric motor (AD) change, which in turn are controlled by a frequency converter with vector control, and based on their values, the values of the electromagnetic moment M and the angular velocity o are calculated computational Z s 70 block (OB), where the algorithm is implemented:

I (me -Meze- -- o e "I and" "sing ZB00 "102 where:

Ma- electromagnetic moment AD;

Me, mk - mechanical losses of AD moment; (ав) Ф - angular speed of TM; - H- pressure TM; o - productivity of TM; - yap - transmission efficiency ratio; 4) yam - Coefficient of useful effect of TM,

According to equation (1), the real values Н(С)) are calculated, which are compared in the comparative element (PE) with the specified value Н зад (Ззад) and the error signal А Н(А С) is fed to the input of the frequency converter and is a function of the rotation speed setting. » To implement the algorithm (1), the following dependencies are defined:

Neo,

Yam U mu 6o which are obtained experimentally or from reference literature and are approximated by the following expressions:

ON. OV. St.

Jan --Oyu NE av a o. eyes; where, A, B, C, Y, E, E, b, I are approximation coefficients determined for a specific TM. 65 The use of this method allows to increase reliability, speed of operation and reduce capital investment during its implementation.

Claims (1)

The formula of the invention 5. : below The method of controlling the technological parameters of turbomechanisms, which includes the use of electrical energy parameters (voltage, current, frequency) and, based on their calculation, the development of control actions, which differs in that to obtain the real technological characteristics of the turbomechanism, the electromechanical parameters of the electric drive are used (electromagnetic torque and speed 70 electric motor), which are formed by a frequency converter with vector control, and for the implementation of the control algorithm, calculations are performed according to absolute values. « (Se) cha «- «in) (Se) - with . and? (o) («c) - -I 4) 60 b5