两级式光伏并网发电系统功率变换控制研究

Power Conversion Control of Two-stage PV Grid-connected Generation System

本文以光伏并网发电系统为研究对象,研究其中的功率变换拓扑、最大功率跟踪和并网逆变控制策略。仿真结果表明,系统可以跟踪光伏阵列环境条件的变化,准确追踪最大功率点,并且并网电流与电网电压保持同频同相,以单位功率因数向电网输送电能。

Two-stage PV grid-connected generation system was taken as the research object, the power conversion to pology,m axim um power p oint tracking and g rid connected in ve rte r control strategy were investigated. S im ulation re sults showed that, the system could track the variation o f the PV array outer environm ent factors, and then track the maximum power point o f PV array accurately, the grid current could be the same frequency and phase w ith the grid voltage, the e le ctrica l power was conveyed in to g rid w ith u n it power factor.