CAJ | 학술논문

有源滤波器 LCL 滤波系统存在谐振，需要引入阻尼。通过对比分析，发现当有源滤波器采用电流定时比较控制时，滤波电容并联虚拟阻尼策略最为适宜。该策略检测滤波电容的谐波电压，通过比例环节等效于电容并联虚拟谐波电阻，增强系统的阻尼作用，整个策略实现简单且避免了微分运算。通过建立离散域的数学模型，根据朱利稳定性判据求得虚拟阻尼系数的稳定域条件：即采样频率需大于滤波器谐振频率的6倍，以保证系统的稳定性；进而，系统的稳定域随采样频率的提高而增大，随滤波器谐振频率或滤波器网侧总电感值的增大而减小。仿真和实验分析证明了所提出的虚拟阻尼策略及理论分析的正确性。
유원려파기 LCL 려파계통존재해진，수요인입조니。통과대비분석，발현당유원려파기채용전류정시비교공제시，려파전용병련허의조니책략최위괄의。해책략검측려파전용적해파전압，통과비례배절등효우전용병련허의해파전조，증강계통적조니작용，정개책략실현간단차피면료미분운산。통과건립리산역적수학모형，근거주리은정성판거구득허의조니계수적은정역조건：즉채양빈솔수대우려파기해진빈솔적6배，이보증계통적은정성；진이，계통적은정역수채양빈솔적제고이증대，수려파기해진빈솔혹려파기망측총전감치적증대이감소。방진화실험분석증명료소제출적허의조니책략급이론분석적정학성。
Resonance existing in an active power filter LCL system should be restrained by introducing damping.When the current timer comparison control method is used,the strategy for the filter capacitor with virtual damping in parallel is proved appropriate by contrast and analysis.By detection of harmonic voltage on the filter capacitor,this method is equivalent to a virtual harmonic resistor in parallel with the capacitor under the function of proportional component to enhance the damping effect.The method is easily implemented without differentiation.In addition,a mathematical model is developed and the stability domain of the virtual damping control coefficient is obtained according to the July stability criterion.Firstly,to ensure system”s stability,the sampling frequency must be six times greater than the resonant frequency.Furthermore,the stable region is enlarged with an increase of sampling frequency,and narrowed with an increase of resonant frequency or total grid-side inductance.Simulations and experiments have proved the validity of the proposed virtual damping strategy and the theoretical analysis.