光伏发电单元布置及容量优化设计

Optimal design of unit layout and capacity for PV power generation

在光伏电站的每个光伏发电单元内,考虑到不同布置格局的光伏发电单元直流汇流电缆工程量差别大,不同装机规模对工程建设成本及发电量的影响,需合理配置光伏阵列与逆变器容量。通过设计分析及工程实践,提出光伏发电单元应尽量布置成正方形格局、将逆变小室布置在光伏发电单元的几何中心、采用单位兆瓦的装机规模、装机容量大于逆变器额定容量的设计理念。按此优化设计可减少单位兆瓦光伏发电单元的电缆用量,降低功率损耗,提高设备利用率。

In each power generation unit of photovoltaic power station, a reasonable allocation of photovoltaic array and inverter capacity are needed by considering the different lengths of DC bus cable due to the different arrangements and the influences of different installed capacities on construction cost and generation capacity. In view of design analysis and engineering practice, this paper proposes that the units should be arranged as a square with the inverter room in the geometric center of each unit, and the idea of MW - level PV installation capacity （more than the inverter rated capacity） is adopted. It is indicated that the optimal design can lessen the amount of cable in MW - level PV power generation unit, reduce power consumption and improve the e- quipment utilization rate.