According to the physical model of photovoltaic cells and the output characteristics of photovoltaic arrays under different illumination intensity and ambient temperature, the theoretical analysis and implementation of the maximum power tracking control based on Boost circuit are carried out. The work principle of three-phase photovoltaic grid-connected inverter is discussed. And the three-phase photovoltaic grid-connected system is built in PSCAD/EMTDC. The model construction of 20MW photovoltaic power station is carried out by using PSCAD simulation software, and the simulation of the grid-connected process is carried out to analyze the impact on the power quality of the grid. Finally, a feasible solution is proposed and simulated.
秦鸣泓,杨胜云,常湧. 基于PSCAD/EMTDC的光伏并网系统建模与仿真[J]. 分布式能源, 2019, 4(4): 10-16.
QIN Minghong,YANG Shengyun,CHANG Yong. Modeling and Simulation of Photovoltaic Grid-Connected System Based on PSCAD/EMTDC[J]. Distributed Energy, 2019, 4(4): 10-16.
表1 公共电网谐波电压(相电压) Table 1 Harmonicvoltage of public grid (phase voltage)
电网标称电压/kV
电压总谐波畸变率/%
各次谐波电压含有率/%
奇次
偶次
0.38
5.0
4.0
2.0
6.00
4.0
3.2
1.6
10.00
35.00
3.0
2.4
1.2
66.00
110.00
2.0
1.6
0.8
表1 公共电网谐波电压(相电压)
图16 补偿后并网侧电压总谐波畸变率
图17 补偿后光伏电站并网后并网侧电压波形
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