Research On MPPT Of Photovoltaic Poverty Alleviation Power Station Under The Condition Of Module Partial Failure

It is a general trend for new energy to replace traditional energy.The non renewable and over exploitation of fossil fuels make the energy supply difficult and environmental pollution more and more serious.Looking for a sustainable and renewable new energy has become a research hotspot.Photovoltaic power generation is a very important renewable energy utilization technology.Photovoltaic poverty alleviation power station is a small power station project that it uses the photovoltaic effect of solar energy and photovoltaic modules to promote in the vast rural areas of China with convenient Utilize,low investment cost and quick effect.However,due to the vulnerability of photovoltaic power station’s photovoltaic panels to the external environment,the utilization rate of solar energy is low.The problems existing in the long-term use of photovoltaic panels are mainly short circuit,open circuit,surface stain coverage,etc.,which seriously affect seriously affect the power generation capacity of photovoltaic poverty alleviation power stations.Therefore,timely detect the fault location of photovoltaic panels to ensure that the photovoltaic poverty alleviation power station works at the maximum power point before and after the fault.Therefore,it is particularly important to improve the power generation of photovoltaic poverty alleviation power stations.Firstly,the research status of photovoltaic poverty alleviation power station power generation principle and maximum power tracking is summarized.Then the working principle of photovoltaic poverty alleviation power station power generation is analyzed,and the mathematical model of photovoltaic cell is established through the analysis results,and then handle according to production process and flow,photovoltaic cells are connected in series and in parallel to form photovoltaic modules;Photovoltaic modules are connected in series and in parallel to form a photovoltaic array to realize a photovoltaic poverty alleviation power station with required power generation.From simple to complex,this paper verifies the power generation performance of photovoltaic cells,photovoltaic arrays,photovoltaic modules and photovoltaic poverty alleviation power stations through simulation experiments.The improvement of the power generation of the photovoltaic poverty alleviation power station mainly lies in(1)the selection of high-efficiency photovoltaic conversion photovoltaic modules(the performance price ratio is the primary consideration for the photovoltaic poverty alleviation power stations in remote areas and poor mountainous areas);(2)the realization of the efficiency of the dc/dc converter and other related circuits for the stable supply voltage of the photovoltaic poverty alleviation power station;(3)the power buffer of the energy storage device that maintains the stable supply of the photovoltaic poverty alleviation power station and its bi-directional DC converter efficiency;(4)the maximum power tracking effect..Secondly,the detection method and fault diagnosis strategy of photovoltaic panel of photovoltaic poverty alleviation power station with multi coordinated switch linkage are proposed.The existing methods not only increase the early construction cost of the photovoltaic poverty alleviation power station itself,but also add additional overhead to the management of the background database.Based on this,a multi bit coordinated switch linkage diagnosis strategy is proposed by my paper,which is mainly compared with the traditional fault detection methods in the following aspects: the number of sensors,the complexity of wiring,the number of switching,etc,The proposed improved strategy can simplify the wiring,alleviate the maintenance workload and increase the advantage of fault detection under the condition of reducing the number of sensors,that is,quickly locate the location of the fault path through the principle of small branch in abnormal state,and quickly determine the location of the specific fault photovoltaic module through voltage sensor;At the same time,GUI human-computer interaction interface is added to make the simulation experiment easy to operate.At last,the maximum power tracking control strategy of photovoltaic poverty alleviation power station system based on improved particle swarm optimization algorithm is proposed.In view of the shortcomings of the general detection method in multi peak detection: the traditional method cannot realize the global MPPT tracking in the case of multi peak components,the excellent search characteristics of particle swarm optimization are used to optimize the MPPT.Considering that the traditional convergence factor and its inertia weight affect the overall search performance of the algorithm,the strategies such as Cauchy variation and compressibility adjustment of convergence factor are proposed for the convergence factor and inertia weight,and the improved particle swarm optimization algorithm,Realize global search.The simulation results show that compared with the general detection method and the original particle swarm optimization algorithm,the tracking speed and steady-state accuracy of the improved particle swarm MPPT are greatly improved in the use scenario of photovoltaic poverty alleviation power station.