New Paths Towards Building-to-Building Decentralized Energy Management

Abstract

Distributed generations (DGs) and Renewable energy sources (RES) have become the most important and common these days. These DGs and RES have small or no rotating mass and damping behavior, which results in very low inertia and damping effect compared to conventional power plants. Studies showed this affects the grid dynamic stability, frequency, and voltage regulation of energy exchange between buildings in a distributed network. So implementing a systems that emulates the behavior of synchronous generator for integration of DG's to grid is a must, to improve the inertia for dynamic stability of the power system. This thesis presents the design and simulation of a virtual synchronous generator (VSG) based control of building-level interlinking converters for building to building energy exchange in islanded and grid-connected operation. Details of the mathematical modeling for selecting the relevant parameters for the virtual synchronous generator, and state-space modeling and analysis to enhance the dynamic response of the system are presented. The simulation of the islanded, grid-connected, and parallel operation is carried out in Matlab/SIMULINK with a dynamic load. The transient behavior of the system at a time of connecting, disconnecting, and reconnecting to the grid is minimized with an improved method for grid pre-synchronization. Finally, the results and comparisons of the simulation results are presented in detail.