1、附录一英文资料翻译 Industrial enterprises of reactive power compensation Abstract The improvement of industrial enterprises is to improve the power factor of electric power efficiency,an important means of saving energy. In this paper, theoretical analysis and application examples of the industrial enterpris
2、es,the significance of reactive power compensation and the role and view of the current power system,industrialenterprises,the problems for the proposed improvements and measures. Introduction In industrial enterprises,the vast majority of electrical equipment belongs to perceptual load， these devic
3、es in operation to absorb a large number of reactive power. An increase in reactive power supply system power factor to lower system voltage drop to occur,electrical equipment not fully utilized, increasing line losses and lower-powered equipment,power supply capacity and so on. In situ reactive pow
4、er compensation and thus improve the power factor of the Energy Conservation has extremely important significance. The choice of method of compensation Compensation for reactive power compensation is divided into centralized and decentralized compensation for three kinds of compensation and in situ.
5、 Focus on compensation,thatis,high and low voltage power distribution set up by several groups within the capacitor ， capacitor connected to the power distribution bus,the compensation for the distribution of power within the reactive power,and to reach the required value of the total power factor a
6、bove. This method of compensation can compensate for high and low voltage bus routes prior to the reactive power,which is equivalent to the reactive power source to move the electricity distribution companies,allowing users to power the system requirements for reactive power has been reduction in th
7、e electricity sector to achieve the required power factor. And their distribution within the enterprise bus following the line of transformer and reactive power compensation can not play a role,there is still a large number of reactive power line flows within the enterprise and generate losses. Disp
8、ersion compensation is the capacitors were installed at various workshops at the switchboard,which will enable installation of distribution transformer and the substation to the plant lines can be due to a decrease in reactive load compensation effect. Local compensation is the reactive power compen
9、sation device directly connected to the induction motor terminals on the side or into the line. Focus on compensation methods used in the capacity of capacitor compensation or in-place than the grouping of compensation should be small,its utilization rate is even higher disadvantage is the change in
10、 distribution has not been compensated by the feeders,only lightened the load reactive power grid. Dispersion compensation in the way the utilization of capacitor compensation than the in situ high,so the total requirement of compensation is smaller than the spot is an economical and reasonable reme
11、dy. Reactive power compensation should follow the overall planning,rational distribution ， classification of compensation,in-place balance； focus on compensation and dispersion compensation combine to spread-based compensation； high compensation and low voltage compensation combined with low-pressur
12、e-based compensation； Regulator combined with lower losses,down are the main loss principle 1. Compensation capacity to determine In the power grid in the reactive power consumption is a big， about 50% of the reactive power consumed in transmission， transformation and the device， 50% of the consumed
13、 electricity users. In order to reduce reactive power consumption， it is necessary to reduce the reactive power in the grid where flow. The best way to start from the user to increase reactive power compensation,improve user load power factor,so that Generator reactive power can be reduced and the r
14、eduction of transmission， transformation and distribution equipment in the reactive power consumption， so as to achieve the purpose of reducing wear and tear 2. Compensation for reactive power capacity of Qc for 22121111c o s c o sc a vQP Load changes can be decided according to the static or dynami
15、c compensation mode. When the load change is relatively stable,we should use the static method of compensation,which can not only reduce the line losses， and investment； when the load change is large， dynamic compensation method should be used， stable voltage 3. Reduce line losses Is located at a ra
16、ted voltage,active power is constant,due to power factor changes,the line loss rate of change P% for the 212c o s% 1 ( ) 1 0 0 %c o sP As can be seen from Table 1 to improve the power factor in lowering power consumption,improving economic efficiency plays an important role. Table 1 Power factor and
17、 power loss percentage of the corresponding data If a constant active power condition,the original power factor cos1 of 0.59,compensated power factor cos2 of 0.98,its line loss rate reduction % to 64%. Dynamic compensation device. Group to track the power capacitor compensation， power factor can be different from the stability provided in the context of the power factor to achieve adequate compensation purposes.
