| Photovoltaic power generation is a kind of renewable energy for powertechnology, which can not only reduce global pollution, but also solve the problem inremote areas and areas without electricity. But the output of the photovoltaic powergeneration systems have the characteristics of intermittent and randomness, whichmakes it difficult to forecast the output, limiting the large-scale application ofphotovoltaic power generation systems. When interconnecting to the power grid,random output may increase the uncertainty of the safe operation of the power grid.Therefore it is necessary to study the influence of the safety of power grid caused byrandom output of photovoltaic power generation system.Aiming at this problem, this paper establishes the model of solar radiation andthe reliability of photovoltaic power generation system, using Monte Carlo method torandom sampling of those models, in order to get a random output model ofphotovoltaic power generation systems. And then a random sample of the entireequipments and the random output of photovoltaic power generation was extracted.Combining with the risk theory, the risk indicators of the power grid caused by therandom output of power grid operation is calculated.Stochastic output model of photovoltaic power generation systems, process ofoperation risk assessment were made, using MATLAB software to program. Finallyusing IEEE-RTS79system as an example, analyzed the influence to the operation riskcaused by different capacities and positions of photovoltaic power generation systemsconnecting to the power grid. Calculation result shows that dispersedly adding smallcapacity of photovoltaic power generation branches at the heavier load areas caneffectively reduce the risk of power grid operation. Selecting appropriate photovoltaicpower generation branches and capacities can reduce the operation risk, and thecalculation result can be a basis of choosing capacities and positions of DG branchesconnecting to the power system. |
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