НАСОСЫ_РЕГУЛИРОВАНИЕ_1 / 0274870_89A0A_mustafin_m_a_energosberegayushie_sistemy_elektroprivoda_cent

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

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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

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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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