摘要：To change the electrical power system from conventional system or existing system to micro grid one needs to check the performance of this system and analyze all parameters. Actually the power grid consists of three essentials parts that are generation, transmutation line and distributions system. Among all parts feeders, transformers and some of electronics parts are to improve the voltage drop or decrease the active power losses and interfaces between two systems. The main advantage of the micro grid is integration of the renewable energy recourses into the power grid through transmutation line or distribution system, but before integration one needs to check and evaluate all parameters of the system (cable, transformers, load flow, losses, etc.). and find out how to improve them . This paper consists of three parts: the first part is introduction about important parameters in the power grid, the Second part analyzes system from IEC standers by using MATLAB software and discuss on the result of these systems. as well as it involves an idea of how to improve it by using the Newton Raphson method. The third part is about power quality analysis and effect of the harmonics on the current and voltage wave form.
关键词：micro grid;renewable energy;control power flow;MATLAB
