摘要
针对光伏并网逆变器采用准比例谐振控制策略时,忽略了LCL滤波器本身存在的谐振问题,采用无源阻尼和有源虚拟阻尼电阻并联两种方案,抑制LCL滤波器产生的谐波,提高并网电压和电流的稳定性.通过建立无源和有源的系统控制模型,构建开闭环传递函数,从而求出前馈系数.研究结果表明:有源阻尼电阻并联比无源阻尼电阻并联方案能更好抑制谐波,不额外增加功率损耗,能提高系统的动稳态性能,降低并网电流和电压的谐波含量.
For photovoltaic grid connected inverter using quasi proportional resonant control strategy, which is ignored by the resonance problem of LCL filter itself, this paper suppressed the harmonics produced by the LCL filter by adopting the passive damping and active damping virtual resistor in parallel with the two schemes, and improved the stability of the grid voltage and current. Through the establishment of passive and active system control model, the open loop transfer function is constructed, and the feedforward coefficient is obtained. Simulation results show that the active damping resistor in parallel can obtain better harmonic suppression than that of passive damping resistor parallel scheme with no additional power loss, and it can improve the system dynamic steady-state performance and reduce the harmonic content of the grid connected current and voltage.
出处
《辽宁工程技术大学学报（自然科学版）》
CAS
北大核心
2016年第11期1300-1304,共5页
Journal of Liaoning Technical University (Natural Science)
基金
国家自然科学基金项目(51177076)
关键词
逆变器
准比例谐振
LCL滤波器
无源阻尼
有源虚拟阻尼
Inverter
quasi proportional resonance
LCL filter
passive damping
active virtual damping
