Design And Application Of Distribution Transformer And Dynamic Compensation Integrated Device

With the increasing power load and the diversity of load types,the issue of distribution network power quality has become increasingly prominent.The current harmonic components of the power grid are increasing,especially the unbalanced currents accumulated on the neutral line and the harmonic currents of the zero-phase currents of the phases far exceed the relevant design standards of the electrical regulations,bringing power quality problems at the same time.It also causes a waste of energy,and it also brings serious safety hazards to the distribution transformers,placing higher demands on the quality of power supply.The IOkV distribution transformer,as a direct device for power supply to the grid,is one of the most severe equipment that suffers from unbalanced,reactive,and harmonic problems.The distribution and dynamic compensation integrated device integrates the distribution transformer and the dynamic compensation unit to integrate the unbalance,reactive power,and harmonic compensation devices into a controllable current source for load current control with multiple functions.In the case that the compensation capacity provided by the DC side is limited,flexible compensation for selectively variable ratios of harmonic currents,reactive currents,and load unbalanced currents can be achieved,while achieving the goal of.both improved power quality and reduced distribution transformer losses.This paper discusses the different effects of power quality and energy saving under different compensation methods,and proposes an optimized coordinated control strategy based on the optimization theory of multi-objective weights for the distribution and dynamic compensation integrated device to realize both the improvement of power quality.For the purpose of minimizing the optimal compensation for transformer losses,the PSCAD simulation platform was used to simulate the calculation.The power quality improvement and loss reduction under the optimization strategy and the traditional compensation strategy were compared to prove the improvement of the proposed optimization control strategy.The combined effect of power quality and reduced transformer losses is even more pronounced.According to the design requirements of the distribution and dynamic compensation integrated device,the structural design in terms of heat dissipation and electromagnetic compatibility is verified by Solidworks and Ansys workbench,and the heat dissipation and electromagnetic analysis of the main components of the distribution transformer body and the smart compensation unit are analyzed.Compatible features,on the basis of this,taking into account the mutual influence between sensitive components,the structural design of the integrated device was carried out,and the structures of the three integrated distribution and dynamic compensation devices,namely discrete,integrated,and floor-standing boxes,were proposed.This paper designs the main circuit selection of integrated device for distribution transformer and dynamic compensation based on DSP-F2812 and FPGA control core.Finally,the experimental prototype was manufactured for pilot operation.The application shows that the distribution transformer and dynamic compensation integrated equipment can solve the power quality problems in the station area,improve the power quality in the station area,and effectively reduce the cost of operation and maintenance of distribution transformers and the transformer station area line.Loss and damage increase the level of integrated intelligence in transformer station area.