Research And Application Of Micro-grid Intelligent Monitoring System

In the application process of the integrated microgrid control system,there are problems such as increased monitoring range,insufficient monitoring,and difficulty in discovering hidden safety hazards and weak links in the microgrid in time.In this regard,a design of an intelligent monitoring system for the microgrid based on the integrated control system is proposed.By integrating and sorting the important monitoring objects(voltage,current,power flow,frequency)when the microgrid is connected to the grid and disconnected from the grid and switched,it will alarm in time when the limit is exceeded,and timely discover the potential security risks of the power grid.In this thesis,the optical storage microgrid is taken as the research object,and the working principle and control strategy of photovoltaic power generation and energy storage are modeled and analyzed respectively.Through modeling and simulation,the information to be monitored in microgrid is classified,so as to prepare for system-level coordinated control.Aiming at the fluctuation problem of off-grid switching process,the mathematical model of energy storage inverter control strategy is analyzed.Starting from the current inner and outer loop and frequency control link,additional modules are added to compensate the fluctuation of frequency and voltage caused by the change of input quantity in mode switching process.A coordinated control strategy based on hierarchical control and intelligent monitoring is proposed based on the principle of economy of the system.By monitoring the status of distributed power supply,energy storage and power grid,taking the electricity price at different times as variable information and according to the constraints of microgrid,the coordinated control strategy of microgrid in the process of grid-connection,off-grid and switch-over is formulated.Distributed power supply,energy storage and power grid can realize economic energy flow according to the instructions sent under the control strategy.Finally,an example is analyzed to verify whether the micro-grid intelligent monitoring system can perform corresponding actions in different situations by offline simulation on Matlab.And through the configuration software MCGS to write the intelligent monitoring system operating system,the system to ensure equipment level and system level information monitoring and policy implementation,and monitoring information storage and abnormal information alarm function.