Studies on Modeling and Control of Distributed Energy Storage System in Microgrid
|School||Huazhong University of Science and Technology|
|Course||Proceedings of the|
|Keywords||Piconet Energy storage Battery Supercapacitor Control strategy Composite Energy Storage|
Large number of distributed power access, the security and stability of large power grids can not be ignored , micro- net is a good solution for a distributed power supply connected to the grid . Micro and stable operation of the network , the energy storage system has played a great role in the control of the energy storage system is the key , so this study micro network storage system modeling and control strategy . This paper begins with a macroeconomic point of view , the overall structure of the piconet do an analysis . First micro- network modeling, to build simulation platform in Matlab , based on Siemens standard 20kV voltage distribution network and 400V low voltage feeder to modify the voltage level and some parameters , the establishment of 10kV medium voltage distribution network and 400V micro network simulation model. Then further study the piconet distributed power model , taking into account the the piconet distributed power generally smaller , focused on the three-phase photovoltaic and asynchronous fan modeling , to study the mathematical model and control strategy access piconet simulation , its port characteristics correctness of the modeling . The focus of this paper is to study the modeling of the energy storage system , first determine the basic structure of the energy storage system : Batteries connected by buck-boost bi - directional DC / DC circuit boost a bi-directional DC / AC converter , and then through a filter and transformer liter pressure to the power grid . Studied the DC / AC inverter and DC / DC converter , the mathematical model and control strategy . Access to the piconet of the simulation model of the structures of the energy storage system to do simulation , the energy storage system can exchange power to the micro-grid , to verify the feasibility of such a structure . The innovation of this paper lies is to propose a short-term load forecasting based energy storage system active control strategy , the battery can not be frequent charge-discharge characteristics , made ??improvements on the traditional control strategy to determine the charging and discharging of the energy storage system in load forecasting based on interval , and do the simulation study of energy storage systems for micro network load shifting ; study energy storage system to improve the stability of distributed power piconet ; propose a battery and super capacitor composite energy storage structure , consider the characteristics of the battery and supercapacitor complementary , and both take different control strategies through simulation study composite energy storage for power fluctuations stabilize micro- network analysis and simulation results indicate that this structure is feasible .