Typical Design and Simulation Experimental Study of DC Micro-grid Control System

摘要

With the development of power electronics technology and the promotion of changes from both the power supply side and the load side, distributed energy is increasingly being connected to the grid in the form of AC/DC hybrid micro-grid. The innovation will bring about a significant change on the network structure, new challenges to the design of the micro-grid control system, and also put forward new requirements for the simulation test method. Based on the control objects and target functions of different levels of the DC micro-grid control system, this paper proposes a typical design method of the DC micro-grid control system, and the corresponding performance indicators. Meanwhile, in order to solve the contradiction between simulation calculation time and equivalent modeling accuracy, this paper uses modular modeling design and simulation method to build three-level simulation models for components, devices and systems, and divides the grid-connected DC micro-grid system into control nodes in three categories, builds subsystems for corresponding simulation models and control function sub-modules, established closed-loop test platform based on RTDS, and then carried out hardware-in-loop test for micro-grid control system to verify the performances of the control strategy.