Research On Key Technologies Of Partial Porous Externally Pressurized Gas Bearing

With the rapid development of global economy,the contradiction between energy and economic development have become increasingly prominent,China gradually develop nuclear energy is also stepping up the development of solar power and other clean energy,the photovoltaic power generation system as the research object,the principle of photovoltaic power generation,the main components are introduced,and analyzed the influence of photovoltaic power distribution network.Photovoltaic power generation technology in MPPT technology is always the core part,it can determine the efficiency of photovoltaic power generation,are similar to the analysis of factors affecting the maximum power point of the photovoltaic power generation,followed by an analysis of various MPPT control strategy,put forward the asymmetric fuzzy control strategy,the proposed method can effectively restrain the fluctuation near the maximum power point at the same time,the maximum power point tracking effect is good.Finally,according to the effect of the island effect on the photovoltaic power generation,a wavelet transform based detection technology is proposed,which has good effect after simulation by the BOOST control circuit of DSP.Subsequently,a protective circuit is given to protect the PV generator in the isolated island state.The arrangement and main contents of this paper are as follows.The first chapter introduces the research background and significance of PV grid connected generation,and the current research status of PV grid connected generation system.The second chapter introduces the basic principle of photovoltaic power generation,photovoltaic power generation system according to the application form will be divided into large-scale photovoltaic grid connected photovoltaic power station and distributed photovoltaic power station,the key device in grid connected photovoltaic system inverter are introduced.The third chapter describes the impact of photovoltaic grid connected to the grid,including power quality,islanding effect and the impact on the distribution network.The fourth chapter introduces an important part of photovoltaic power generation system-maximum power tracking and control technology.After analysis,it is considered that the oscillation of power is caused by the asymmetry of the photovoltaic device.In this paper,an asymmetric fuzzy control method is proposed to eliminate the influence on the output power.The fifth chapter designs a hybrid form of photovoltaic power generation structure,which can be used as an independent power supply,and can also send excess power to the grid,which has the function of island monitoring.In this paper,the research work is focused on the possible efficiency of photovoltaic power generation in practical engineering applications and the stability of islanding detection.It has important engineering application value.