Abstract
The development of a microgrid for archipelagos like Indonesia is a solution in supplying electrical energy. However, the load connected into the microgrid systems vary, this causes a systematic change in the form of voltage. In this paper, the microgrid testbed simulation is explained. The simulation system of the microgrid testbed consists of a diesel- fueled power plant as an implementation of a synchronous generator and two micro-hydro power plant and wind power plant as an implementation of induction generators. The change of load will affect the output voltage of the synchronous generator thus affecting the output voltage of the microgrid system. Excitation control on a synchronous generator is needed to maintain voltage stability regardless of load variation. In this paper, the excitation system of the synchronous generator is simulated. The excitation system uses the topology of DC chopper as an excitation voltage regulator with a PI control system. Testing is done in two scenarios with three load variations when DC Chopper is controlled and uncontrolled. The presence of an optimally controlled DC Chopper can control a system's voltage output that sits at the standard (+5% dan −10%) Vrms ±220 Volt.
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