Research On Influence And Control Of Power Quality Of Distribution Network With Multi Distributed Generation

With the expansion of the scale of power grid and the more access of power electronic equipment and new energy power generation technology, power quality problem has been paid more and more attention. Power quality directly affects the power network in power transmission efficiency, the normal use of the equipment in a power user experience and distribution network. Especially the access of each kind of new distributed power supply, a direct result of the deterioration of the power quality in power distribution network, but the research and development of new energy, grid is under the condition of energy resource constraints must be. In order to better use of new energy power generation technology, distribution network in access to distributed generation power quality problem has become an important research topic.In this paper, we firstly introduce the working principle of distribution network in a variety of new distributed power, and on this basis, establish its mathematical model and the further analysis of the distributed power, points out the main power characteristics; analysis of typical distributed power supply connected to the distribution network of the grid structure, analysis of distributed power supply connected to the distribution network control mode.Secondly, after the introduction of multiple distributed generators connected to distribution network electric energy quality problems, mainly from the aspects of the distribution network voltage quality and the current quality consideration, analysis of multiple distributed generators connected to distribution network location and output changes brought about by the distribution network electric energy quality changes; at the same time, due to the interaction between distributed power distribution network node electrical to quality variation problem has also carried on the detailed analysis.Finally, on the analysis of traditional distributed power quality control method based on the proposed a distributed power quality composite control method, using the principle of harmonic droop to realize active power filter function module in the no communication condition harmonic power allocation, a simplified model of distribution network system and verified by simulation. The results show that the distributed power compound control method can well realize harmonic suppression and reactive power compensation and grid generation. Composite control method for dynamic response speed, strong stability, which can at the same time to realize the distributed power grid control and power quality comprehensive management.