摘要
针对定电压跟踪光伏系统最大功率点(MPPT)控制上存在的功率损失和适应性差问题,提出自适应电压变化率的MPPT 控制方法。该方法通过检测光伏系统电压—输出功率曲线的梯度变化,利用最小二乘法推导出变频器电压的变化量,并用定电压PI 控制变频器输出频率。该控制法经光伏水泵系统仿真试验验证其有效性。结果表明:①系统的实际发电量达到理论最大发电量的99%以上;②具有快速起动性能,从起动到额定输出时间仅为8s;③具备良好的动态性能,当日照强度急变时,能迅速稳定输出,避免系统崩溃。该方法可用于多种光伏系统中。
This paper proposes a control method for maximum power point tracing (MPPT) with adaptive voltage, aiming at solving the problems of power loss and poor adaptability in controlling MPPT of constant-voltage tracing photovoltaic system. The method is implemented by measuring the grads variety of voltage-output curve of the photovoltaic system, and obtaining the voltage variation volume of transducer using the least square method, and controlling the out-frequency of transducer with constant voltage PI. Its efficiency is verified by simulating photovoltaic pumping system. The results indicate:①the practical generating volume is larger than 99 percent of maximum generating volume in theory; ②the system has a quick start performance, capable of reaching a rated output in eight seconds; ③its sound dynamic performance guarantees a stable output in case of abrupt changes in solar intensity, thus avoiding the breakdown of the system. The method can be applied to various photovoltaic systems.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2005年第8期95-99,共5页
Proceedings of the CSEE
