Research On Comprehensive Control Of Power Quality In Low Voltage Distribution Network

Low-voltage distribution network as an important part of the power system,the stability of the system is directly related to the power supply reliability of the entire load.Due to the low power distribution of low-voltage distribution network,the load there is a lot of randomness,low-voltage distribution network,there are three main problems.The first one is that there is a large imbalance current between the three-phase systems supplying power to the distribution network.The second one leads to insufficient reactive power in the distribution network and a decrease in voltage at the end of the power supply line.Third,the voltage drop causes the entire line loss to increase.Therefore,the effective control of low voltage distribution network is directly related to the power quality of the entire low-voltage distribution network,which is of great significance to improve the reliability of the power supply of the entire power system.In this paper,the problems of low voltage and line loss due to three-phase imbalance in LV distribution network,reactive power shortage and so on are studied.At the same time,the causes of low-voltage distribution network and its influence are analyzed.Secondly,it introduces the integrated power quality control device of low voltage distribution network,including the full-control intelligent power quality correction device SPC and the LVR LVR function(three-phase unbalance compensation,reactive power compensation,voltage support and terminal low voltage Suppression),the principle and its installation.Finally,the operation effect analysis of the low-voltage distribution network in a certain area where the integrated control device is installed is carried out.The main method is to monitor and compare the data of the operation grid before and after the operation of the integrated control unit is put into operation,and analyze the reactive power compensation of the low-voltage distribution network Effect and energy-saving effect of reactive power compensation,three-phase unbalance degree of improvement and the effect of reducing the line loss.The results show that the low-voltage distribution network in the region after the installation of low-voltage distribution network power quality control device can effectively improve the three-phase imbalance in the system to compensate for reactive power to improve the power factor and reduce line losses,to improve the low voltage distribution Grid power quality has a significant effect.On the comprehensive management of low-voltage distribution network power quality in a great sense to improve the power quality of low-voltage distribution network power supply to improve the low-voltage distribution network system to provide energy to protect the reliability of the power supply system and reduce the economy of the entire power grid Losses,in a certain sense,promote the economic growth of the entire community.