Research On Control Strategy In Low Pressure Micro Power Grid Based On New Energy Storage Technology

Currently energy and environmental issues have become a key factor restrictingsocial development, but distributed power generation technology can make a win-winsituation for the energy conservation and environmental protection, so this kind oftechnology has become one of the important development directions in the electricalpower industry. However there are also many problems with distributed power. Inorder to solve the contradiction between the power systems and distributed power, theconception of microgrid was proposed. And it has already become one of the mostforefront topics in the international electrical engineering line.This paper mainly studies the related theory about control strategy in lowpressure micro power grid, and detail the vanadium flow battery energy storagetechnology and its application in micro power grid, become the foundation forsubsequent micro grid research.Firstly, based on the process vanadium flow cell charges and discharges in acycle,established the model of vanadium flow battery, and observation the chargedstate of SOC in different linear, The simulation analysis verifies the vanadium flowcell is gentle in linear range20%~80%of change.Secondly, based on the analysis of micro power inverter control method andprinciple，establish the equivalent model in micro power grid, while discussed on thedesign method on the basis of PQ controller, V/f controller and synchronous parallelin controller. and use Simulink simulation software to build the simulation model formicro-grid and control system. Simulation analysis verify the effectiveness andcorrectness of the control strategies.Finally, based on the most power tracing method control the surrunding,establish two specific micro power supply models that include wind generator andphotovoltaic power generation system. Finally, in Simulink software, set up the wholesystem model, respectively exit configuration vanadium flow batteries in wind field mouth and solar array, To absorb supply wind and light complementary, used tostabilize parallel in power and in the island as the network element, the simulationresults verify the feasibility of the control strategy.