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The problem of increase of efficiency of production, transmission and consumption of electric power are current importance because diminishing of power-hungryness of products allows to reduce its prime price and promote a competitiveness. Actuality of this problem increases in countries with limited energy supplies [1].
Compensation reactive power is current importance for industrial enterprises. The value of reactive power in the electric network of industrial enterprise is determined parameters and mode of operations of electro-receivers. Crossflows of reactive power are the forced ballast of electric network, their presence leads the negative effects. There are overload of lines of electricity transmissions by reactive currents; increase of sum of payment for utillized electric power. These negative effects must be limited. Attaining it is possible by making of part of necessary reactive power.
Compensation reactive power provides the decline of losses of electric energy and charges on building and exploitation of electric networks.
The task of Compensation reactive power on industrial enterprises is needed and economic justified.
The purpose of work is a decline of the resulted expenses on the system of electricsupply of industrial enterprise taking into account paying for reactive energy, losses of electric power in electric networks by the optimum placing of capacitors banks and choice of the mode of operations of synchronous engines from point of compensation reactive power in the network of industrial enterprise.
The task of researches is further perfection of the proper program.
Industrial enterprises have the ramified network and large number of electro-receivers, consuming a reactive power. Therefore for them a question about compensation reactive power (CRP) is current importance. CRP can be executed by capacitors banks (CB). They are connected to 6 – 10 kV buses of main step – down substation of industrial enterprise, to distribution points or on the 0,4 kV side of transformer shopfloor substation [7,8]. Also by high-voltage synchronous engines (SE) [9]. But it is necessary to define power of devices of CRP and their optimum placing in the network of enterprise.
At choice and power of capacitors banks connecting place the great number of factors among which such influences, as:
• a decline of losses of electric power in lines and transformers;
• possibility of choice of transformer of less power on shopfloor substation;
• diminishing of sections of cable busses of electricity transmissions;
• cost of set CB;
• losses of active power in CB on the generation of reactive.
Size generated high-voltage SE reactive power is determined from such terms:
• the active loading of SE must be taken into account;
• losses of active power in SE on the generation of reactive;
• reactive loading of network of user.
The choice of optimum places of connecting devices of CRP depends on many parameters. The choice of optimum decision can be done on the basis of technical and economic calculation. Function makes for the calculation of the resulted expenses. Further numeral methods are determine a minimum of this function.
For the valuable use of the program its addition is required certificate information, touching an electric equipment and it cost.
The use of the developed program allows to reduce the losses of electric power in the network of industrial enterprise, to optimize paying for reactive energy, to make a decision about expedience of the use of SE for CRP, to decrease the resulted expenses on the electricsupply system (ESS). The program can be utillized both on the stage of planning of ESS for the choice of its elements, economic expedient chart of electricsupply in a complex with compensation reactive power and for operating enterprises.
At writing of this abstract of thesis master's degree work is not yet completed. Final completion: December, 2009. The complete text of work and materials on the topic can be got for an author or his leader after the indicated date.
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