摘要
针对分布于电网末梢的单相LCL型光伏并网发电单元,提出了一种单电流反馈有源阻尼优化方法抑制LCL的谐振尖峰,并采用SRFPI控制方法零稳态调节单相逆变器的瞬时并网电流,使系统具有低谐波失真的并网电流及无功补偿功能。对于LCL谐振抑制,通过对并网电流的高频分量反馈增加了系统阻尼,减少了额外的传感器,提高了系统稳定性;将该单电流反馈系数中多变量降为单一变量,在响应速度和阻尼系数中择优选取参数值,降低参数设计复杂度,提高系统性能。给出了单相逆变器并网系统的设计,分析了SRFPI控制策略以及单电流反馈中不同参数对系统性能的影响,并给出了最优参数的选择方法,确定反馈参数的取值。仿真和实验结果验证了所提方法的有效性。
For the single-phase photovoltaic grid-connected generation unit installed at the end of the grid, a single current feedback control strategy based on active damping optimization is proposed. The synchronous reference frame proportional intergral （SRFPI） strategy is adopted to control the grid current with zero steady-state regulation. By this way, the system could quickly provide low harmonic distortion current and the required reactive power. Through sampling and feeding back the derivative and high frequency component of the grid current, the system damping increases while the number of sensors decreases. Meanwhile, the optimization method can decrease the multiple variables of feedback factors to single one, which reduces the complexity of system and improves the system performance. The paper designs the grid power control, and analyzes the method of SRFPI as well as the system performance under different control parameters of the single current feedback control strategy. Meanwhile, the selection method of optimization parameters is also proposed. Simulation and experimental results verify the proposed control strategy.
出处
《电工技术学报》
EI
CSCD
北大核心
2016年第6期144-154,共11页
Transactions of China Electrotechnical Society
基金
国家自然科学基金重点项目(51237003
51577056)
湖南省博士生科研创新项目(CX2015B084)资助
关键词
并网控制
功率控制
同步旋转坐标变换
LCL滤波器
单电流反馈
动态性能
Grid connect control, power control, synchronous rotation coordinate transformation, LCL filter, single current feedback, dynamic performance
