When distributing the power of photovoltaic grid-tie inverter,the corresponding impedances of individual in-verters are different due to the influence of spatial-time position difference and external load difference,which gives rise to the reactive power of the inverter.Therefore a power distribution optimization method of photovoltaic grid-tie inverter based on particle swarm optimization algorithm was proposed.On the basis of calculating the relationship between inverter terminal voltage and line impedance,the reactive voltage droop characteristic curve of the inverter was obtained,and the power allocation objective function was constructed from the perspectives of droop coefficient and line impedance.After the particle swarm size was set according to the executable range of the operating parameters of the photovoltaic grid-tie in-verter,the optimal allocation result was determined by calculating the fitness value of the particle position and the objec-tive function.In the test results,the reactive power under the proposed method remained stable within 1210.0 var,at a relatively low level.
关键词
粒子群算法/光伏并网逆变器/功率分配优化/端电压/无功电压下垂特性曲线/目标函数/适应度值
Key words
particle swarm optimization/PV grid-tie inverter/power allocation optimization/terminal voltage/characteristic curve of reactive voltage droop/objective function/fitness value
维普
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