Research On Optimal Control Of Multi-Energy Complementary Microgrid

Microgrid is composed of several distributed generators,energy storage equipment,energy replacement module,load,protection and monitoring devices,which can realize self-control,protection and management of small power distribution system.Microgrid is an important form of distributed energy generation,which can integrate many different distribution systems into the same network and complete the control operation and energy management of local power grid.Microgrid can operate as both controllable generation/power unit and small regional power grid independently and autonomously.The development and research of microgrid is very broad.For the multi-energy complementary microgrid system,The working principle and basic classification of photovoltaic,wind power generation systems and energy storage devices are introduced.The operation characteristics of wind,photovoltaic power generation system and energy storage device are analyzed respectively,and the corresponding mathematical model,control system model and electromagnetic transient simulation model are established.In PSCAD software,the operation characteristics of different parts are studied,and the validity of the model is verified.In this paper,the structure and control strategy of the microgrid system are analyzed.By optimizing the control strategy,the central control model of the system is established.In this paper,the main factors affecting the grid-connected system are analyzed,and the characteristics of the micro-grid are studied when there are errors in voltage and frequency.The grid-connected system model is built in PSCAD,and the conclusions of operation control characteristics and grid-connected dynamic characteristics are obtained.Finally,the control strategy of grid-connected microgrid is studied.Based on the analysis of the synchronous control strategy adjustment method of microgrid,an optimal control strategy is proposed,which solves the grid-connected collapse caused by the limitation of single regulating power supply capacity in traditional power grid by active power distribution,effectively reduces power flow between grids,suppresses frequency and voltage oscillation,and ensures the parallel separation of microgrid under various working conditions.Smooth control.The control strategy is simulated and the simulation results verify the effectiveness of the proposed method.