Study On The Configuration Of Energy Storage System In Distribution Network

The reliability of power quality and power supply is becoming more and more stringent.The demand of power and the load difference between peak and valley is increasing;Moreover,the permeability of distributed power supply,which is dominated by wind power and photovoltaic,is rising gradually.It has brought a great challenge to distribution networks of orderly scheduling and reliable operation.The introduction of the energy storage system into the distribution network not only can reduce the system standby power and reduce the difference of load peak and valley,improve the system equipment utilization,but also provide active and reactive power to ensure stable operation of the system.Moreover,the storage energy system can improve the absorption capacity of wind power,photovoltaic and other distributed power,which promote the development of renewable energy power generation technology in the power grid.In this paper,the configuration of energy storage system in distribution network is analyzed.In the traditional distribution network,discussing the economy of energy storage system at first,and an economic model is established considering the impact of the battery discharge depth on its service life and the initial cost of the battery,operation and maintenance cost and the part of value,and calculating the optimal lead-acid battery capacity aiming at minimizing the annual cost,and analyzing the factors of affecting on the economy.For the distribution network with distributed power supply,a multi-objective optimization model is established with the minimum voltage fluctuation of the distribution network node and the economic optimum of the energy storage device considering the economic benefit and investment cost of the energy storage system,the multi-objective algorithm based on the artificial immune algorithm is used to solve the model.By the simulation analysis of three different battery types verify the reliability of the model.Finally,the influence of PV permeability on the configuration and economy of the battery energy storage system is analyzed.In order to further optimize the energy storage equipment configuration and improve the economy,consider the sequence complementary of distributed power supply on the impact of energy storage capacity.This paper analyzes the timing relationship among wind,light and load,and puts forward the indexes of power consumption fluctuation and wind-solar complementary characteristics.Based on the investment of energy storage equipment,a multi-objective model is established aiming at the minimum initial investment cost and the minimum fluctuation power of the distribution networks.Proposing fuzzy control strategy for the hybrid energy storage system for power distribution to extend the battery life,and show the complementary between battery and super-capacitor.In conclusion,the energy storage system configuration is influenced by the characteristics of the load,the supply of distributed power and other factors.In order to receive the more reasonable energy storage system configuration,analyzing the internal relations between these factors deeply.The government should formulate energy storing strategies to promote the development of energy storage industry taking into account the energy storage device can versatilely benefit the grid as well as the social environment.