Modelling and analyses of electrical power system of communication satellites

Geosynchronous (GEO) communication satellites design is a result of a joint work of different engineering branches (Mechanical, Electrical, Electronics, Computer Engineering). Communication satellites which include variety of complex electronic systems have a unique design and designing of this complex electronics is a time-consuming engineering task. The electrical power system is , one of the most critical systems in satellite which is about 36 000 km from the earth, and the average operating time of over 15 years, should be designed to operate at the desired performance Regarding design approach, especially for the electrical power system of the communications satellites, making the right choice and taking the right decision at the beginning of the design will have cost and time effect. In this respect, having accurate design modeling which include all the arguments of system is very useful at the begging of design phase. In this study, communication satellites power system modelling is designed by using P-spice in order to make optimization of power system regarding bus power reliability. The designed modelling is validated with analyses which the result values are compared with real flight satellite systems. P-spice model includes total satellite electrical power system architecture as Solar Array, Battery, Solar Array Regülatör (S3R), Battery discharge Regulator (BDSR), Main Error Amplifier (MEA). With modeling, satellite electrical power bus voltage analyzes and EMC fluctation amalysis are obtained and compared with the actual satellite data. It has been identified that, the results of the analysis and the actual satellite data overlap with each other. Design of electrical power system (EPS) and developed battery sizing tool are explained.