Discussion Based On The Inverse-load Voltage Regulation And Energy Conservation Of Main Transformer

Nowadays,with fast update of power systems,the power grid structure becomes increasingly complicated.Therefore,the power supply quality problem of power distribution network has attracted great attention from relevant working personnel and power consumers.So,how to provide power consumers with high-quality electric energy and reasonably improve economic benefits of power grids becomes a very important problem that power grid is faced with.Currently,in order to solve the problem of voltage excursion caused by load changes,most regions adopt the principle of local reactive power balancing for power grid.However,since fluctuations of load in the power distribution network are too big,such a method cannot realize overall coordination of the whole network,and sometimes in the process of on-load voltage regulation,it's easy to cause oscillations of the power grid.This may lead to extremely low voltage at the end of power grid during the load peak period,high systemic voltage during night and load valley period,and dramatic increase of iron loss of the power grid.Therefore,people begin to be focused on an energy-saving measure that combines voltage regulation and parallel capacitor compensation.In the thesis,it was proposed to adopt on-load inverse voltage regulation technology reasonably for the whole distribution network and carry out study on the premise of reactive compensation and on-the-spot balance and with the improvement of voltage quality,the saving of power grid electricity and the reduction of power grid loss as the target and to adopt on-load voltage regulation technology for the main transformer in the power grid for reasonable selection of voltage regulation grade according to the change of load and the principle of minimum loss of the whole network,eliminating the limitation of previous literature to single emphasis on the economic operation of transformers.During the actual operation of the distribution network,since the load factor of the distribution line is not consistent with that of the distribution transformer,too large error of the line loss calculated with equivalent resistance method would be caused.Regarding this,the equivalent resistance method was improved in this thesis to calculate the line loss on the basis of the running parameters and rated capacity of the distribution transformer,the parameters of the distribution line,and the electric quantity in the distribution transformer and the distribution line,improving the calculation accuracy and laying a foundation for the analysis on examples of loss reduction and energy saving of distribution network.Meanwhile,practical operation parameters of Shenyang Dong-min Transformer Station were taken as examples.Through comparison of data,economic voltage levels of Dong-min Transformer Station were analyzed.The results showed that the increase of load rate would lead to increase of active power loss of each circuit and overall loss as well as increase of the economic voltage corresponding to the minimum power loss;in the process of regulating voltage,two factors,namely quantity of transformers in each branch of the transformer station and length of electric transmission line,should be taken into consideration as highlights;and reasonable use of on-load reverse voltage regulation technology and adoption of economical operation method could ensure voltage stability and improve the overall economic benefits of the power distribution network.The application of on-load reverse voltage regulation technology to generator step-up transformer significantly improved the voltage qualification rate and reduced active power loss of the power grid,so as to reach the goal of coordinated energy conservation and loss reduction of the whole grid.This not only ensured stable and safe operation of power grid,but also brought great social significance and economic benefits to citizens' life.