Мустафин М.А. Энергосберегающие системы электропривода центробежных насосных агрегатов. Автореферат

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Mustafin Marat A.

Power saving systems of electric drive of centrifugal pump unites

This work is dedicated to the actual technical-economical problem – creation

of the energy saving system of automated electric drive for control of the

centrifugal units.

Mechanisms of centrifugal function (CM) are most mass and энергоемким

consumers of electrical energy. Now in world practice is existence of the stability

tendency of replacement of the non-regulated electric drives of the centrifugal

pumps (CP), compressions, fans for regulated systems. It’s conditioned by

considerable losses of power in application which was used in schemes lately –

pressure and productivity of the CM.

In spite of the most wide-speeded method- throttling-the value of the losses

on the elements of stop valve can reach 50% of consumed power by unit during the

regulation of CP by rotate frequency of the wheel by means of automated electric

drive.

The effective transferring of the centrifugal mechanisms to regulating drive

systems must accompanied by elaborating of the new economized systems of

electric drive which adapted to CP like a control object. As a automated electric

drive system of centrifugal pump the most wide-sprained get electric drives based

on a syndromes engine (AE) by scheme frequency transformer – asynchronous

engine and the system with machine of double supple (MDS) – asynchronous

engine to stator and contact rings of rotor which is bring up the voltage amplitude,

frequency and phase regulated voltage.

Operating conditions of the engine and converter are determined, finally, by

defined parameters of the pipe and the characteristics of the pump. From the point

of view of carry out of researching of the “regulating electric drive - pumping unit

- pipe” in complex was not enough.

Operating conditions, regulation parameters of rotary pump, which are

determining the requirements to the electric drive, are various depending on

purpose of unit. The correct selection of the electric drive system, elaboration of

the optimal engine control and converter rules must be guided by exact

identification of the rotary pump like a load of the drive.

The offered variants of the optimal controlling of asynchronous motor

doesn’t take no account with a adequate features accuracy of the rotary pump and

pipes, like a load of the drive.

For the mentioned systems of the electric drives is necessary to develop the

algorithms of the controlling of suggested electric drive which is allow to minimize

the losses of electric power and reactive power consumption in drive during

controlling of operating conditions of rotary pumps of the units. It is necessary to

develop the united methods to make assessment of the proposed solutions.

There is a significant influence of the unsinusoidality of the converters

voltage and current on the energy of the drive. It is necessary to make analysis of

the electromagnetic and electromechanical process, integral energy indexes of the

pump electric drive with taking into account the current and voltage

unsinusoidality, contrastive analysis of the several of forming variants of the

converters output voltage which is based on minimized power consumption

conditions in the various operating conditions of the rotary pump.

The objective of the work is developing the scientific basis of the

asynchronous energy-saving regulating drive system with centrifugal load:

1. To obtain the functional dependences which connecting the hydraulic,

mechanical and electrical power canal variables of the centrifugal units.

To identify the rotary pump as a mechanical load of the controlled

electric drive.

2. To develop the united method of the calculations for electromagnetic and

electromechanical process for the various asynchronous regulating drive

systems of the rotary pump.

3. To develop the optimal rules and the mathematics models for rotary

pump electric drive with the minimum of the engine losses and with a

minimum of reactive power consumption with a taking into account the

parameters of the pump and piping.

4. To develop the researching of the electromagnetic and electro mechanic

processes at the control mode of the pump units.

5. To develop the methods of the calculations, mathematic models for

researching of the processes at the electric drive with a taking into

account the unsinusoidality of the converters current and voltage.

As a result of realized researching:

• The modified mechanical characteristics of the asynchronous

regulating drive systems with centrifugal pumps and piping was

obtained.

• The basic rules of the electromagnetic and electro mechanical

processes are passing in static and dynamical conditions of the

main asynchronous drive systems of the rotary pumps.

• The mathematic models of the asynchronous regulating pump

drive systems was developed which allow converters, engines,

pump units and pipes characteristics.

• The methods and the algorithms of the optimal regulation of the

asynchronous regulating pump drive systems with a minimum of

energy expense were offered.

• There are electromagnetically, electromechanical processes and

integral energy indexes of the engines of centrifugal units with a

supply by the various converters was developed.

МУСТАФИН МАРАТ АСКАРОВИЧ

Энергосберегающие системы электропривода центробежных насосных

агрегатов

05.09.03 - Электротехнические комплексы и системы

Автореферат

диссертации на соискание ученой степени

доктора технических наук

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