Resonance Issues and Damping Techniques for Grid-Connected Inverters With Long Transmission Cable

LCL-resonance damping strategies for grid-connected inverters with LCL filters: a comprehensive review

“…6 i L1 0°)1 1[ 59, 60] 1 for a low value of a [11,12]; lead filter [11]; notch filter [11,14] No extra sensor for i L1 control \ (1 Require accurate system information i L2 ±180°)1 Notch filter 1 for a high value of a [11,12,26]; lowpass filter [11]; notch filter [11,16] No extra sensor for i L2 control…”

“…The notch filter damps the resonance through direct magnitude adjustment as long as it has an extremely low gain at x res . Filter-based AD has been broadly discussed in [11][12][13][14][15][16]. 4 Overview of resonance damping strategies with multi-state feedback 4.1 Multi-state feedback control based on zeroplacement…”

“…Filter-based AD improves stability by adding a digital filter next to the current controller [11][12][13][14][15][16]. For feedbackbased AD, the state used for feedback can be the capacitor current [17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32], the capacitor voltage [33][34][35][36], the inverterside current [37], the grid current [38][39][40][41] or a combination of multiple states [42][43][44][45][46][47][48][49][50].…”

Frequency Domain Stability Analysis of MMC-Based HVdc for Wind Farm Integration

“…Shunt capacitor banks and high-frequency harmonic filters in wind power plants can create significant parallel resonance interaction with the main transformer and any associated load tap changing apparatus, and harmonic filters were used to address these resonance concerns in [8]. In [9], the highfrequency resonance issues in offshore wind farms caused by the distributed inductance and capacitance of the long-distance HVAC transmission cable was investigated, and a cascaded notch-filter-based active damping method was also proposed to eliminate the resonant peaks. In [10], subsynchronous resonance (SSR) in DFIG-based wind farms, resulting from the interaction between the converter control and the seriescompensated line, was studied and impacts of wind speed, compensation level, and current controller gain on SSR were then examined.…”

Impedance Matching Based Control for the Resonance Damping of Microgrids with Multiple Grid Connected Converters

“…Therefore, the LCL filter is susceptible to coupling with an external network as an intermediate component without constraints by the current control loop, which may pose a potential threat to system stability. In addition, the performance of these methods, which were designed with a relatively fixed parameter, may degrade because the structure and impedance characteristics of the external network which the GCC is confronted with will be variable and complicated as the microgrid is further developed [4], [23], [24]. In order to deal with the harmonic resonance in increasingly complicated microgrids, it is necessary to take a comprehensive consideration of the GCC, the coupling among multiple GCCs, the grid impedance, the special distributed, etc.…”