Research On Coordinated Control Technology Of Small Hydro Power And Hybrid Storage System In Micro-grid

Distributed power is an effective way to solve the problem of power supply in remote areas without electricity.In China's non-electrified areas such as Tibet and Qinghai,power demand is small and far away from large power grids,and the power supply problem is solved by long-distance transmission technology,and the construction cost is high and running Maintenance difficulties,the use of abundant local solar,wind and water resources and other resources,according to local conditions to build multi-energy complementary power generation system,often more technical and economic solutions.Aiming at the low power supply reliability of traditional distributed SHP,this paper solves the problem of operation control of a variety of renewable energy complementary power supply system through the research of coordination control technology based on micro-grid SME and hybrid energy storage system.By increasing the limiting links to improve the droop control of energy storage inverters to improve the adaptability of energy storage inverters under different operating modes of microgrid,the smoothing of the hydropower stations and new energy power plants in / out of the network is achieved Switching and steady operation.The analysis model of the power domain stability of the inverter and synchronous generator based on impedance is established,and the mechanism of oscillation under the weak network access to the grid-connected inverter is revealed.The current operating conditions of the small hydropower station unit Analyzes and formulates the control strategy of the small hydropower station,and carries on the simulation analysis of the single-machine and multi-machine operation;establishes the new energy grid-connected inverter,the energy and power hybrid energy storage power conversion system,the power frequency division of the small hydropower unit Frequency control model.Based on the above-mentioned differences and complementary characteristics of the distributed power frequency control,the power frequency division control model of the multi-power co-frequency-modulated independent power supply system is established to further improve the power quality and reliability of the distributed energy.