CAJ | 학술논문

针对定步长扰动观察法存在的不足(扰动步长过小，外部条件变化较快无法快速跟踪；扰动步长过大，在最大功率点功率振荡比较大)，为了提高电流快速跟踪能力，提出一种基于电流预测控制的自适应变步长最大功率跟踪方法。该方法结合自适应变步长控制器和电流预测控制器各自优点，将此方法应用于中点钳位型三相三电平光伏发电系统。建立起10 kW 三相三电平光伏发电系统实验平台，并与传统最大功率跟踪方法进行对比实验。实验结果表明：所提出的最大功率跟踪方法使系统具有很好的静、动态性能。
침대정보장우동관찰법존재적불족(우동보장과소，외부조건변화교쾌무법쾌속근종；우동보장과대，재최대공솔점공솔진탕비교대)，위료제고전류쾌속근종능력，제출일충기우전류예측공제적자괄응변보장최대공솔근종방법。해방법결합자괄응변보장공제기화전류예측공제기각자우점，장차방법응용우중점겸위형삼상삼전평광복발전계통。건립기10 kW 삼상삼전평광복발전계통실험평태，병여전통최대공솔근종방법진행대비실험。실험결과표명：소제출적최대공솔근종방법사계통구유흔호적정、동태성능。
Due to the shortage of the fixed step perturbation and observation (P&O) method (if the perturbation step is small, it cannot fast track under a rapidly changing weather condition; and if the perturbation step is large, there will be large oscillating power around the maximum power point (MPP)). In order to improve the ability of fast current tracking, the paper proposed an adaptive variable step maximum power point tracking (MPPT) based on a current predictive controller. The new algorithm has combined the respective advantages of the adaptive variable step controller and the current predictive controller, which is applied to a neutral-point-clamped (NPC) three-phase three-level photovoltaic generation system. Comparative experimental tests for different conventional MPPT algorithms have been verified based on three-phase three-level photovoltaic generation system rated at 10 kW. The experimental results show that the proposed MPPT algorithm has good steady-sate and dynamic performance.