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Photovoltaic (pv) grid power system efficiency where 20% of the loss?

by:Fangpusun     2020-10-25
In photovoltaic (pv) grid power system before and after construction, both the user and enterprise, one of the most concerned matters is how future earnings, and the influence factor of yield is the system capacity, and notice the photovoltaic (pv) grid power generation systems impact on power generation efficiency. Normally, photovoltaic (pv) grid power system efficiency will be reduced by 20%. Dust and rain shelter: 8% large photovoltaic power stations are generally located in the gobi area, sand blown, little precipitation, consider to have management under the condition of artificial cleaning a phalanx frequency component, the attenuation value: 8%; Temperature changes: 3% solar modules will increase due to lower the temperature change and the output voltage and current, reduced component practical efficiency, capacity reduction, therefore, the temperature of photovoltaic (pv) grid power system low efficiency is an important factor that must be considered in the design when considering the temperature change caused by voltage change, and select the component serial number according to the change, ensure that components can work in most of the time within the scope of the maximum power tracking, consider 0. 45% / K calculating weighted average power change, consider months irradiation, can calculate the weighted average, there exist certain differences because of different geographical environment temperature, the impact on the efficiency of system there exist certain differences, so considering temperature efficiency of photovoltaic (pv) grid power generation systems to reduce value of 3%. Component series mismatch: 2% due to production process problems, lead to different components have a certain deviation between power and current, single battery components of photovoltaic (pv) grid power generation system, the photovoltaic (pv) grid power station consists of many parallel of battery components later, because of power and current of the deviation between components, the efficiency of the photovoltaic power station will have a certain influence on the. Component series because current inconsistent reduce efficiency of photovoltaic (pv) grid power generation system, select the lower efficiency of 2%. Dc cable power loss: 3%, according to design experience, 20 MWP pv grid-connected power generation project using conventional photovoltaic dedicated cable dosage is about 350 km, dc distribution cabinets of power cable junction box to ( Commonly used specifications for ZR - YJV22 - 1 kv - 2*70mm2) Is calculated in the dosage of about 35 km, the dc portion of the cable loss 3%. Inverter power loss: 2. The current domestic production of high-power inverter (5% 500千瓦) Basic efficiency achieves 97. 5% of system efficiency, grid inverter adopts type transformer, transformer isolation by double division two parallel inverter, inverter inside does not consider efficiency of transformer, inverter power loss for 97. 5%, 97. 5%. Communication cable power loss: 1% due to the photovoltaic (pv) grid power plants commonly used in situ booster interconnection in the form of communication cable for high voltage cable, usually the smaller part loss and computing communication part of the cable loss is about 1%. Transformer power loss: 2% transformer for mature products, choose efficient transformer, transformer efficiency is 98%, the power loss of about 2%. Comprehensive power loss of each part above, calculate the efficiency of photovoltaic (pv) grid power generation systems: loss of components of dust, temperature efficiency loss, the component does not match the pressure drop loss and line loss, inverter efficiency, step-up transformer efficiency, communication lines, such as the loss can be calculated from photovoltaic (pv) grid power system efficiency: eta = ( 1 - 8%) * ( 1 - 3%) * ( 1 - 2%) * ( 1 - 3%) * ( 1 - 2. 5%) * ( 1 - 1%) * ( 1 - 2%) = 80. 24%. Through the above analysis, can be concluded that photovoltaic (pv) grid power system efficiency is typically 80%, while 20% of the loss of environmental factors, also have technical factors, the two will be the trend of the main considerations.
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