CAJ | 학술논문

在新能源分布式并网发电系统中，通常采用无源低通滤波器对脉宽调制逆变器产生的高频谐波进行有效衰减，而其滤波特性好坏直接决定着系统性能和成本体积。在分析现有L型、LCL型和LLCL型滤波器拓扑结构和滤波特性基础上，提出了一种新的LLCCL型并网接口滤波器。为抑制滤波器谐振尖峰以保证系统稳定运行，采用 Rd 阻尼法和Rd-Cd阻尼法对LCL型、LLCL型和LLCCL型滤波器进行无源阻尼，并对不同阻尼方法应用到不同滤波器拓扑时的谐振尖峰阻尼效果和高频谐波衰减效果进行了深入分析与对比研究。仿真和实验结果均验证了所提新型滤波器结构及无源阻尼技术的正确性和有效性。
재신능원분포식병망발전계통중，통상채용무원저통려파기대맥관조제역변기산생적고빈해파진행유효쇠감，이기려파특성호배직접결정착계통성능화성본체적。재분석현유L형、LCL형화LLCL형려파기탁복결구화려파특성기출상，제출료일충신적LLCCL형병망접구려파기。위억제려파기해진첨봉이보증계통은정운행，채용 Rd 조니법화Rd-Cd조니법대LCL형、LLCL형화LLCCL형려파기진행무원조니，병대불동조니방법응용도불동려파기탁복시적해진첨봉조니효과화고빈해파쇠감효과진행료심입분석여대비연구。방진화실험결과균험증료소제신형려파기결구급무원조니기술적정학성화유효성。
In distributed generation system based on renewable energy sources,a passive low-pass filter is normally used to attenuate high-frequency harmonic components generated by pulse width modulation based inverter. Therefore, the filtering characteristics of grid-interfacing filters have a significant influence on system performance, volume and cost. A new LLCCL filters is proposed based on the analysis of topologies and harmonic attenuation characteristics of L, LCL and LLCL filters in this paper. A series ofRd andRd-Cd damping method are comprehensively investigated and compared in terms of filter resonance suppressions and high-frequency harmonic mitigations for guaranteeing stable operation of LCL, LLCL and LLCCL type filters. Finally, simulation and experiment results are presented to demonstrate the correctness and effectiveness of the proposed LLCCL filter, as well as, of the developed passive damping methods (Rd or Rd-Cd damper) for the three filters.