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Power quality is an important issue for the distribution network companies. They must guarantee the electricity supply fulfilling the requirements for the consumers. In this thesis we investigate specifically voltage requirements. We use transformers and tap changers to see how the voltage works in an electric system and we analyze the relationships with other aspects of the system’s performance,
In today's industry the need for fast logging of measurements is increasing. Existing systems used by Tetra Pak AB have a maximum logging frequency which is inadequate. As a result of this Tetra Pak gave Industriprojektbyrån AB the task of developing a measuring system for this purpose. Industriprojektbyrån AB has before the start of this thesis developed the hardware set up for the system. Th
The purpose of this study is to compare different schemes of anti-windup. The methods are compared for different processes and different disturbances; step response in setpoint, and load and measurement noise. The controller parameters are determined by the MIGO method and the reset time constant. The tests have been done by simulation in Matlab Simulink and the report is divided for PI and PID co
