1.6MW_p屋顶分布式光伏项目的设计

A Study into Designing 1.6MW_p Rooftop Distributed Photovoltaic Power Station

以1.6MW_p屋顶分布式光伏发电项目为例,详细介绍其设计流程。综合考虑各方面因素,本项目采用245Wp多晶硅组件和组串型28k W逆变器,设计中彩钢瓦屋顶采用简单可靠的平铺安装方式。将3个区域共计1.6MW_p的光伏系统经逆变后连接汇流集中升压,升压后接入用户10k V母线处。所发电量全部供给厂区负荷就地消纳,余电上网。本项目接入后满足规范相关短路电流表要小于10%的要求。在电气二次设计中,主要考虑了保护配置、光伏发电站调度自动化、计量、系统通信和电能质量监测装置等方面。发电量可以作为光伏电站建设可行性的一个重要指标,根据项目所在地的太阳辐射值,通过相关公式计算得出系统的年发电量预测值,光伏电站运行期25年内的年平均发电量为1568226.99k W·h,年均每瓦发电量为0.953938377k W·h。

This article describes in detail the process of designing a 1.6MW_p rooftop distributed photovoltaic power generating project.With all affecting factors considered,the project uses a combination of a 245 Wppolycrystalline silicon module and 28 k W string inverters and simple horizontal tile installation is adopted on a color steel tile roof.PV systems in three areas,with a combined capacity of 1.6MW_p,are connected for centralized voltage boosting after being inverted.The current then flows into 10 k V buses of users after being boosted.All power generated is supplied to loads in plant areas for local consumption,with the remainder transmitted into the power grid.The power generated by the project meets the relevant specifications that short circuit current is not more than 10% lower.The main considerations in secondary electrical design include protective configu-rations,automated dispatching of PV power station and metering,system communication and power quality monitoring devices.Power output can be used as an important index to evaluate the feasibility of a PV power station.Annual power output can be estimated based on the solar radiation value of the area where the pro-ject is located and through related formula.The average annual power output of the project during its 25-year lifetime is 1568226.99 k W·h and the average annual power output per tile is 0.953938377 k W·h.