Grid voltage stabilization for smart grid systems

As the power grid is improving and increasing in size day by day, new systems must be developed and designed to control and negate the newly arising problems. This paper proposes a new system to stabilize the voltage fluctuations in grid which often occur in some situations. For example, when a large number of distributed generating resources are connected to the grid and when the load fluctuates rapidly. A system has been proposed here as a solution to the problem of under voltage problems in grid. Whenever distributed generating units such as photovoltaic cells and micro turbines are connected to the grid, the grid voltage increases above the upper acceptable level. During the over voltage situations, the proposed system will be deactivated and the energy storage system will get power from the grid; as a result, the grid-voltage will decrease to an acceptable level. The paper also describes a Grid Tie Inverter (GTI) for the system. The system consists of a monitoring mechanism which continuously monitors the grid-voltage fluctuations. If the grid-voltage falls down to a certain level the control unit will send a command to boost converter unit to boost up the voltage level of the energy storage system. In order to keep the grid-voltage constant no matter how much the load fluctuates, the boosted DC power will then be fed into the grid by using the GTI. The proposed system has been demonstrated through PSIM simulation software. The electronic controlling part of the system has been designed and demonstrated through the Proteus simulation software.