不平衡电压下光伏逆变器直接功率控制仿真
Simulation of Direct Power Control of Photovoltaic Inverter under Unbalanced Voltage
刘国旗 1卢倩楠1
作者信息
摘要
为了有效避免不平衡电压下光伏逆变器产生的波动,提出不平衡电压下光伏逆变器直接功率控制方法.分析光伏逆变器的特点,通过三相逆变器拓扑结构,设计直流侧与交流侧的滤波器参数,结合不平衡电压情况,构建逆变器并网模式下的数学模型,得出不平衡电压对光伏逆变器产生的影响.引入调节参数实时调整自然振荡频率,准确提取正负序分量以及相位信息.通过多目标协调控制方法组建多目标函数,运用粒子群算法对多目标函数寻优处理,输出最优协调系数,使光伏逆变器工作在最优状态,实现光伏逆变器直接功率控制.仿真结果表明,所提方法能够准确提取谐波分量,在功率控制中能够保持一定的稳定性.
Abstract
In order to effectively avoid the fluctuation of photovoltaic inverter under unbalanced voltage,this arti-cle presented a method of controlling the direct power of photovoltaic inverter under unbalanced voltage.Firstly,we analyzed the characteristics of the photovoltaic inverter,and then designed the filter parameters of the DC side and AC side through three-phase inverter topology.Under the unbalanced voltage,we built a mathematical model under grid connected mode of the inverter,thus obtaining the influence of unbalanced voltage on the photovoltaic inverter.Fur-thermore,we used regulating parameters to adjust the natural oscillation frequency in real time,and thus to accurately extract the positive and negative sequence components and phase information.Meanwhile,we used the multi-objective coordinated control method to construct a multi-objective function.After that,the particle swarm algorithm was also used to optimize the function and output the optimal coordination coefficient,thus making the photovoltaic inverter work in the optimal state.Finally,we realized the direct power control of photovoltaic inverter.Simulation results show that the proposed method can accurately extract harmonic components and maintain certain stability in power control.
关键词
不平衡电压下/光伏逆变器/直接功率控制/调节参数/粒子群算法Key words
Under unbalanced voltage/Photovoltaic inverter/Direct power control/Regulating parameter/Parti-cle Swarm Optimization引用本文复制引用
出版年
2024
NETL
NSTL
万方数据