作　　者： ; ; ; ; ; ;

机构地区： 清华大学电机工程与应用电子技术系电力系统及大型发电设备安全控制和仿真国家重点实验室

出　　处： 《清华大学学报（自然科学版）》 2005年第7期873-876,共4页

摘　　要： 为了克服传统两级式光伏并网系统在设备体积、成本和控制复杂度上均存在的不足,提出了一种无直流稳压环节的新型单级式光伏并网系统电路拓扑和适用于此拓扑的电压变化速度受限的最大功率点控制算法(VVSL-MPPT)。使用仿真和实验的方法,对系统的性能进行了验证。实验样机实现连续工作10h的稳定运行,输出稳定在系统最大功率点,并于14:00:00左右达到全天峰值。结果表明,在此算法控制下,系统可稳定追踪最大功率点,并对光照突变等恶劣情况,有较强的适应能力。 Two-level grid connected photovoltaic systems, which contain a DC/DC voltage regulated segment, have obvious drawbacks with respect to system volume, cost and control complexity. A one-level topology for grid-connected photovoltaic systems that is less expensive and uses a control theory based on variable voltage speed limited maximum power point tracking （VVSL-MPPT）, which adapts to the system characteristics. The system performance was evaluated by simulations and experiments. The experimental system was operated continuously for 10 hours at the maximum power point with the peak value at 14：00 pm. The results show that, with the VVSL-MPPT algorithm, the one level photovoltaic grid connected system can smoothly track the maximum power point of the photovoltaic array and has good adaptability to problems like degradation of the photovoltaic laminate.

关 键 词： 太阳能发电 并网系统 最大功率点跟踪控制 恒电压控制

领　　域： [电气工程]