Large-scale Grid-connected PV Power Generation System Design And Research Methods

With the sharp declineing in prices of polysilicon and national policies were introduced, the domestic large-scale grid-connected photovoltaic plant building opened one after another. At present, the domestic grid-connected photovoltaic plant start-up has only just begun, so more power plant design, lack of experience, lack of a mature design standards and criterion. This article focuses on research and investigation of system design method of large-scale grid-connected photovoltaic plant, by optimizing the rational design to bring reference observations for future power plant construction, and reduce the construction cost and increase economic benefits for the investor.Based on theoreticses and experiments, We started to analyse and study in-depth actual issue for the power plant construction research experience. By comparing the traditional formula of calculation and experimental data, amending with the theoretical formula, finally, we achieved purpose of optimal design. The main content include: Bright resource assessment methods, and related theoreticses calculation, and introduced the principle of photovoltaic power generation, photovoltaic power plant design principle, the inverter selection, comparison of installation, the direct radiation section determined to meet the 120W/m2 Winter solstice,determining the best angle, pitch check, comparison of plain scheme, line loss, the calculation of power generation, wind load capacity of components, without the foundation of the feasibility study and analysis. Through the winter solstice the shadow of the test, discovering the shadow value than the calculated value of 14.3% large, so square design in the time to consider the amendment on the distance formula to reduce impact on power generation result from the front row of the shadow block. To suffer wind load test component-based projection bracket tipping moment, and the anchors pulled out masterpiece after analysis and comparison of non-ground support to study the stability of judgments obtained from a stability point of view, no foundation strength Stent installation method is feasible in practical engineering, so that the actual construction of building foundations to consider no installation, can shorten the construction period, more significant savings in installation costs, so the design to be given priority. Another author compared to the four cable wiring scheme, through calculating a variety of line loss and voltage drop, obtained to the most reasonable cable wiring for the program, offered to reference for reducing the cost.Compared with the traditional design,this issue reflect the aspects of sciencific,optimization, rationale and saving. This research of this design play a role in reference and direction to the design of the future power station ,and it will lay the theoretical foudation of carrying out the building work of the large-scale Grid-connected in the future.