Development Of A Shunt Active Power Filter For Micro-Grid

With society developing, studying in improving the application of renewable clean energy, in improving the effective utilization of energy, in realizing the sustainable development urges more and more scientific and technologic engineers to forcing on the Micro-Grid. Furthermore, improving the quality of Micro-Grid power, one of the key technologies of Micro-Grid, has got a widespread attention. This paper based on the birth of Micro-Grid as a background, and then summaries and analyzes the current status of treatment to Micro-Grid power quality through the characteristic of Micro-Grid harmonic and its power quality. Aiming at the active power filter applied in the Micro-Grid, some research is carried on.First of all, the paper analyzes and selects the topology of active power filter which is applied in Micro-Grid, describes its system structure and composition, its applications and its advantages and disadvantages. Based on mathematical modeling and the active power filter applied in Micro-Grid, the paper finishes the selection of key components and the calculation of its parameters, and also finishes the circuit of main power circuit and IPM drive circuit. With that, the paper makes a research in the control system which is applied in the shunt active power filter for Micro-Grid. Aiming at the particularity of Micro-Grid, the paper analyzed and simulated the control algorithms, a damped harmonic composite control algorithm and an algorithm with voltage feed-forward on shunt active power filter control system for Micro-Grid.Then, the paper implements the control system based on a DSP called TMS320F2812with32-fixed-point of TI Company. Circuits, mainly including the main control chip of DSP with its external interfaces, signal acquisition and processing circuit, protection circuit and so on, and system software, including the program of the control algorithm based on the BIOS system of DSP, compose the control system.Finally, the paper builds an experiment platform which contains grid, micro source and nonlinear load,.etc. and applies the control methods which are described in this paper to the active power filter for Micro-Grid based on the platform. The results show that the proposed control algorithm not only can compensate the current harmonics and the voltage harmonics of Micro-Grid, but also can eliminate the possibility of the grid resonance.