Impact And Improvement Of Distributed Photovoltaic Grid-connected On Power Quality

As the energy depletion and environmental pollution become serious, the utilization of solar photovoltaic (PV) generation becomes worldwide hot issue. In this situation, PV grid-connected generation will surely grow into a development trend as a way of using PV generation. but the increasing number of distributed generations brings about some technical problems. Based on the study of distributed PV grid-connected generation system the Matlab simulation model of the distributed PV generations introduced into the distribution network is established in this paper, and then studies the influence on voltage by introducing the distributed PV generations into the distribution network and voltage regulation strategy.Firstly, the basic working principle of the PV cell and main electric parameter is analyzed, and the Matlab simulation model of the PV cell is established, based on this model, the output characteristic curve of the output power of the PV cell was detailed analyzed, which was related to solar irradiance and temperature. Secondly, the influence on voltage by introducing the distributed PV generations into the distribution network and the main factors was analyzed. Based on the typical daily load distribution of the radial distribution network, the influence on voltage of PV generations was studied which on different time of a day and different PV introducing position, the corresponding the influence law was concluded. And then, the advantages and disadvantages of the common distribution network voltage regulation ware analyzed, and the voltage regulation strategy which combined the change of PV introducing position and the change of the ratio of transformation together, then, the feasibility was proved by the distribution network simulation model. Finally, this voltage regulation strategy was simulated and Verified by the example of actual distribution network.