3MW太阳能并网项目介绍

3MW Solar PV station Project1. Summary1.1. LocationThe solar PV station will be built in South Africa.The land should be flat exposed throughout the day.The coordinates: 33° S 18° E ;1.2. PrincipleOSDA Solar’s polycrystalline silicon solar modules which convert the radiant energy of the sun into direct current without emissions are the core of the photo-voltaic solar PV station. The direct current produced by the solar modules is converted into alternating current suitable for the grid by power inverters which are set indoors. The energy collected by many inverters, is supplied tothe local grid by high-tension-transformers (110KV).The Project is placed on a terrain of 40000 m2.The Solar PV Station contains 12480 modules, and its installed capacity will be 2.995MW. High efficiency polycrystalline modules whose unit power is 240Wp will be mounted for the implementation of the project. These modules will be mounted on a metal construction statically with a slope of 28° facing to the north. Six inverters with nominal power of 500kW shall be used to convert the direct current produced by the PV modules into alternating current which will be transferred to the three-phase high-voltage transformer with power 3000kVA.1.3. Climatic DataBy evaluation of the resource there were used data from theNASA.MonthAir Relativetemperature humidityDaily solarradiation -horizontalWindAtmospher Earthspeeic pressure temperatured°C %kWh/m2/d kPa m/s °CJanuary 23.2 47.0% 8.15 97.5 5.1 27.1February 23.4 49.0% 7.27 97.5 5.0 26.4 March 21.9 52.5% 5.92 97.6 4.8 24.1 April 19.1 55.5% 4.41 97.8 4.6 20.4 May 16.3 57.8% 3.25 98.0 4.6 16.7 June 13.4 61.5% 2.81 98.2 5.0 13.2 July 12.7 61.8% 3.05 98.3 5.0 12.5 August 13.4 59.5% 3.86 98.2 4.9 14.0 September 15.3 55.9% 5.06 98.0 4.8 17.0 October 18.1 49.7% 6.48 97.9 5.2 20.9 November 20.1 47.3% 7.63 97.7 5.0 24.1 December 21.7 49.0% 8.18 97.6 4.9 26.1 Annual 18.2 53.9% 5.51 97.9 4.9 20.2Measuredat (m)10.0 0.02. Solar PV station designIn order to optimize the energy yield of the Solar PV station of South Africa, the following design is used:2.1. Optimization title of fixed arrangementIn order to achieve a higher factor of energy yield, an optimization title (25°) is used, see drawing below.Total sun radiation by sloped (20°, optimal (28°), 35°) horizontal and vertical surface.GlobHor kWh/m 2.mthDiffHor kWh/m 2.mthGlobInc kWh/m 2.mth 20°28°35°Jan 253.3 65.73 244.1 234.4 222.8 Feb 204.4 51.83 210.1 206.5 200.7 Mar 183.2 54.85 204.4 207.2 206.9 Apr 129.0 43.57 158.4 165.8 170.2 May 95.7 42.51 125.0 133.5 139.2 Jun 79.2 33.52 110.4 120.1 126.9 July 88.4 36.53 120.8 130.6 137.4 Aug 113.8 44.33 142.9 150.8 155.7 Sep 147.6 51.84 170.5 175.0 176.8 Oct 200.3 64.29 210.7 209.1 205.0 Nov 230.4 60.26 226.2 218.1 208.5 Dec 253.6 68.91 240.3 228.6 215.9Year1978.8 618.17 2163.8 2179.7 2165.92.2. Optimization of mutual arrangement shadingIn the early morning and evening hours, there is a mutual shading of the fixed arrangement among themselves. The optimization of the distance between the arrangements allows for the minimization of energy losses due to shading so that they are financially tolerable.There size of effect was calculated at 2.8% by considering of sun shading limit angle at 22.8° and title plane of modules 28°.3. Energy yield SimulationThe simulation has been executed by the program PVsyst. PVsyst is a programmer for the design and simulation of grid connected photovoltaic systems. With PVsyst the most commonly-used system configurations can be optimized for efficient system design.The simulation takes the mentioned shading angles of the modules ODA240-30-P into consideration as well as the reduction factors. The result of annual yield of solar PV station for the first year is calculated as5093MWh/year (PR = 78.1%).4. Techniques4.1. The solar modulesSolar modules are the core of every PV facility. In each solar module, highly efficient solar cells are interconnected electrically and combined mechanically. Polycrystalline Solar modules are used in the solar PV station. The modules’ output is 240Wp per module, with an efficiency level of 14.7%. The high quality of OSDA Solar modules means they stand out among the competition.Detailed information about the quality of OSDA Solarmodules:⏹High capacity through the use of high potential solar cellsand the exploitation of the modules’ surfaces;⏹25 year guarantee for performance 80%;⏹ 5 year guarantee for the material;⏹Easy installation thanks to prefabricated solar cables;⏹Framework consisting of high-value anodized aluminumwith a double chamber system and drain holes;⏹High-value product quality due to comprehensive finalcontrols against inspection sheets for each module;⏹ Low iron tempered safety glass with high transmission rate;⏹ Voltage 1000V;Each module has its own serial number welded onto it and undergoes flash testing. The inspection sheet for each module will be preserved together with the technical documentation of the project. For this reason, it will always be possible to compare modules’ actual capacity with the original data.4.3. The invertersThe solar PV station uses the most modern central inverters, which are designed for use under all conditions. With a maximum possible efficiency of 98% and the European efficiency level 97%,The inverters offer a peak power with almost no loss of energy.Special digital algorithms guarantee a high tracking efficiency for a wide voltage range: 99.9% in stable conditions and 99.6% in unstable conditions. Each inverter is equipped with high-value semiconductor technology. The absence of transformers, whilst at the same time using modern electronics and optimized internal connections, reduces losses in the inverter and allows it “to catch” each watt from the PV-module. The inverters are designed for high power and are the first string inverters that combine 900V input voltage, 420-850 V MPP range and multiple direct current inputs in a single appliance.The 900 V input makes it possible to operate multiple modules in series. Three independent direct current inputs offer more flexibility and allow us to add an arbitrary number of modules in string.The wide MPP window, combined with efficient tracking, guarantees high efficiency for the whole voltage range. In light of their above-mentioned operational specifications, high efficiency and operational simplicity, central inverters are particularly suitable for solar PV station.An integrated communication board allows a monitoring appliance to be connected without using external equipment. Inorder to communicate data directly to an external receiver, the communication board has modems for easy remote surveillance. In the event of a permanent error, a danger signal will be initiated. If the system fails to work correctly, an alarm signal or a flashlight can be activated externally.。