Maintaining power system stability in renewable-rich power systems can be a challenging task. Generally, the renewable-rich power systems suffer from low and no inertia due to the integration of power electronics devices in renewable-based power plants. Power system oscillatory stability can also be affected due to the low and no inertia. To overcome this problem, additional devices that can emulate inertia without adding synchronous machines can be used. These devices are referred to as virtual synchronous machines (VISMA). In this paper, the enhancement of oscillatory stability of a realistic representative power system using VISMA is proposed. A battery energy storage system (BESS) is used as the VISMA by adding an additional controller to emulate the inertia. The VISMA is designed by using Fruit Fly Optimization. Moreover, to handle the uncertainty of renewable-based power plants, the VISMA parameters are designed to be adaptive using the extreme learning machine method. Java Indonesian Power Grid has been used as the test system to investigate the efficacy of the proposed method against the conventional POD method and VISMA tuning using other methods. The simulation results show that the proposed method can enhance the oscillatory stability of the power system under various operating conditions.
To keep the server running properly, the temperature and humidity in the server room need to be considered because if the temperature or humidity in the server room is not suitable with standards it will disturb or damage the existing server. For this reason, the condition of the server room must be monitored and the temperature and humidity in the room are maintained. In this work we design a temperature and humidity remote monitoring system and server room using Lattepanda and ThingSpeak to data cloud of monitoring result. The system design process consists of two parts, the first is the design of hardware reading data on the sensor. The second is sending data to ThingSpeak capable to be resuscitated which is can be accessed via internet using a browser. From the results of the test, it can be seen that Lattepanda can be used to monitor temperature and humidity in the server room. The temperature and humidity can be monitored in real time (every 30 seconds) through the channels provided by ThingSpeak.
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