由于现有的控制方法跟踪控制过程失败,不同节点控制后的功率超过 3600 W,因此研究新能源接入下光伏逆变器快速功率控制方法.通过建立逆变器阵列优化数学模型,添加对应的约束条件.根据逆变器的工作周期,确定开关的占空比,通过划定不同功率等级能获得电路功率的损耗情况.运用改进粒子群算法对逆变器的最大功率点进行跟踪控制,改变光伏阵列的输出电压.通过搜索全局区域调整后可得到最优解.使用修正 PI 控制器进行模糊实时调节,将电流解耦,将新能源输入的有功功率进行分配输出从而完成对功率的快速控制.实验结果表明,实验组在最大功率点跟踪控制过程中能最终收敛于光伏阵列的全局最大功率点,能准确对结果进行跟踪控制,达到良好的控制效果;经过不同节点控制后的功率始终稳定在 3500～3600 W之间,结果符合预期,有效地解决了电压较高的缺陷,实现了光伏逆变器快速功率控制.
Fast Power Control Method for Photovoltaic Inverters Facilitating Integration of New Energy Generations
Due to the failure of existing control methods in tracking control process,the power of different nodes after control exceeds 3600 W.Therefore a fast power control method for photovoltaic inverters is studied.By establishing an in-verter array optimization mathematical model,corresponding constraint conditions are introduced.According to the work-ing cycle of the inverter,the duty cycle of the switch is determined,and the loss of circuit power can be obtained by defi-ning different power levels.Using improved particle swarm optimization algorithm,the maximum power point of the in-verter is tracked and controlled,and the output voltage of photovoltaic array is changed.The optimal solution can be ob-tained by searching the global region and adjusting it.Using a modified PI controller for fuzzy real-time adjustment,the current is decoupled,and the active power input from new energy sources can be distributed to achieve fast power control.The experimental results show that the experimental group can ultimately converge to the global maximum power point of the photovoltaic array during the maximum power point tracking control process,and can accurately track and control the results,achieving good control effects.After being controlled by different nodes,the power remained stable between 3500～3600 W,which met the expectations and effectively solved the defect of high voltage,achieving fast power control of photovoltaic inverters.
new energy sourcephotovoltaic inverterpowercontrol method
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