Stability Simulation And Research Of The Photovoltaic Power Generation In Distributed Generation System

Distributed generation (DG) possesses the following advantages: less investment,more flexibility and compatibility. The joint operation of DG with power grid bringstremendous variation in control and operation for modern power system. DG can meetthe special need of both power system and consumers such as peak clipping, on theother hand, it possesses incomparable reliability and economy which the traditionalpower system does not have. So, it is very important both in theory and practice tostudy DG.Photovoltaic power generation is an important part of the distributed generationsystem. As a kind of efficient and environment-friendly new energy and the substituteof the conventional energy in the future, photovoltaic power generation has widelybeen paid attention day by day. Judging from the present condition, it has importantrealistic meanings in researching the characteristics and the maximum power pointtracking algorithm of the photovoltaic grid-connected generation system.In this paper, the working principle of the photovoltaic cell including its physicalprinciple, mathematical models, output characteristics and the algorithm of maximumpower point pracking is introduced firstly, as well as the improved maximum powerpoint tracking algorithm. Secondly, the typical single-stage and double-stagegrid-connected structures are introduced respectively, focusing on the powerelectronics devices such as inverter and chopper and their control systems and controlstretagies. Based on the principles mentioned above, the stability simulation modelsboth in DIgSILENT and in Stability Simulator for Distributed Generation—SSDG aredeveloped in order to research the stability emulation technology of distributionnetwork including the photovoltaic power generation. At last the emulation results ofthe Benchmark low voltage distribution network including the photovoltaic cell,which are calculated both by DIgSILENT and by SSDG, are compared and analyzed,proving the rationality and feasibility of the models developed.