摘要
LCL滤波器具有优越的高频谐波抑制能力,因而在并网逆变器中得到了广泛应用。为了抑制LCL滤波器固有的谐振尖峰,通常采用有源阻尼的方法,这种控制策略虽然抑制了谐振尖峰,但由于数字控制延迟会造成固有谐振点偏移。针对上述问题,提出了一种以虚拟阻抗模型为基础的有源阻尼叠加的控制策略,在抑制谐振尖峰的同时,又避免了固有谐振点的偏移,并且将有效阻尼区扩大至(0,fs/3)。最后,通过搭建LCL型单相并网逆变器仿真系统与硬件在环半实物样机,验证了该控制策略的正确性,实验结果表明了其具有良好的抗干扰能力、动态性能和稳态性能。
LCL filter has superior high-frequency harmonic suppression capability,and therefore it has been widely used in gridconnected inverters.In order to suppress the resonance peak problem of LCL filters,active damping is usually used.Although the resonance peak is suppressed by this control strategy,the digital control delay can cause the inherent resonance point to shift.To solve these problems,a control strategy of active damping superposition based on the virtual impedance model is proposed,which not only suppresses the resonance peak but also avoids the shift of the inherent resonance point,and expands the effective damping zone to(0,fs/3).Finally,the simulation system of LCL single-phase grid-connected inverter and the hardware in-loop prototype are built to verify the correctness of the control strategy.The experimental results show that the control strategy has good anti-interference abil⁃ity,dynamic performance and steady performance.
作者
张声淇
陈冬冬
洪卫东
沈谢林
林弘毅
ZHANG Shengqi;CHEN Dongdong;HONG Weidong;SHEN Xielin;LIN Hongyi(College of Electrical Engineering and Automation,Fuzhou University,Fuzhou 350108,China;School of Electronics and Electrical Engineering,Minnan University of Science and Technology,Quanzhou,Fujian 362700,China;Quanzhou Power Supply Company,State Grid Fujian Electric Power Co.,Ltd.,Quanzhou,Fujian 362011,China;School of Electrical Engineering,Xi’an Jiaotong University,Xi’an 710049,China)
出处
《南方电网技术》
CSCD
北大核心
2024年第11期1-12,47,共13页
Southern Power System Technology
基金
福建省自然科学基金资助项目(2022J01514)。
关键词
LCL滤波器
虚拟阻抗
阻尼叠加
有效阻尼区
LCL filter
virtual impedance
damping superposition
effective damping zone
