Papers by Author: Huan Wang

Abstract: With the rapid development of the VSC-HVDC Power transmission and distribution grid demonstration projects, the technology of the DC transmission once again becomes a research focus. In order to meet the needs of accessing VSC-HVDC power grid of Photovoltaic power generation, the topologies suitable for photovoltaic high voltage DC grid-connected converter was analyzed, the program based on the dual-module combination of full-bridge topology structure was proposed, a detailed control strategy using dual-loop of voltage and current loops was given, and finally a 12kW simulation model to verifying the system topology and control strategy was constructed using PSIM. The simulation results show that the PV high voltage DC grid-connected converter has a good dynamic response and steady state performance.

Abstract: Three phase double mode inverter system was researched in this paper, whose input was battery bank system with PV generation. This system can be operated in stand-alone mode by connecting to local load and also in grid-connected mode by paralleling with grid. When in stand-alone mode, system worked as voltage source, while when in grid-connected mode, the output current of inverter was controlled following with grid. A transition algorithm to restrain current inrush and fast detection of switch and grid status make sure the seamless transition between grid-connected and stand-alone. This inverter system has advantage of simple structure and easy to implement, so that it was appropriate for micro-grid. .