基于LLCCL滤波器的储能变流器控制策略研究  

Study on LLCCL Filter-based Control Strategy for PCS Converters

作　　者：芦开平 李泰 孙攀磊 鲁庆华 LU Kaiping;LI Tai;SUN Panlei;LU Qinghua(XJ Corporation,Xuchang 461000,China)

机构地区：[1]许继电气有限公司,河南许昌461000

出　　处：《电工技术》2024年第20期30-33,共4页Electric Engineering

摘　　要：在新能源分布式并网系统中,通常采用无源低通滤波器对变流器产生的高频谐波进行有效衰减。滤波器的滤波特性好坏直接决定着系统性能和体积,发展高功率密度变流器需要进一步提高滤波器的高频谐波衰减效果。对此,提出采用LLCCL型并网滤波器,其不仅能对开关频率处谐波实现陷波效果,同时具有LCL滤波器对高次谐波的高衰减特性;提出采用滤波电容串联阻尼电阻来实现对LLCCL滤波器谐振频率的抑制,同时利用PR控制器及相位补偿算法抑制低频谐波。仿真和实验均验证了所采用的滤波器以及控制策略可以有效抑制系统谐振,降低并网电流和电压的谐波含量。Distributed new energy generations-integrated systems commonly use passive low-pass filters to effectively attenuate the high-frequency harmonics generated by converters.The filtering characteristics of the filter directly determine the performance and volume of the system,and the development of high power density converters requires further improvement of high-frequency harmonic attenuation effect of filters.In view of the aforementioned problem,this work proposed the uses of an LCLLC filter and the corresponding control strategy.The former was to achieve simultaneously notch effect at the switching frequency and high attenuation characteristics of LCL filter for high harmonics.The latter was to utilize filter capacitance series damping resistance for suppressing the resonance frequency of LLCCL filter,and PR controller and phase compensation algorithm for attenuating low frequency harmonics.The proposed filter and control strategy were verified,both simulatively and experimentally,effective in suppressing system resonance and reducing harmonic content of grid-connected current and voltage.

关 键 词：PCS变流器 谐振控制 LLCCL滤波器 

分 类 号：TM46[电气工程—电器]