Design and control of an LCL-filter-based three-phase active rectifier
Citations
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Cites background from "Design and control of an LCL-filter..."
...If a small resistor is inserted in series with the -filter capacitor in the -plane the result is the attraction of the unstable poles inside the unity circle [6]....
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...The use of an -filter offers the possibility to reduce switching harmonics injection as well as to limit the value of the converter boost inductance decreasing encumbrance and mounting cost [6]–[8]....
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...2) has already been described in [6] and [8]....
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...If this is not the case the -filter effectiveness is reduced because at frequencies lower than the resonance frequency the filter behaves like the sum of its inductances [6]....
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...Passive damping produces losses (they can be around 1% [6]) which especially in WT-turbine application systems can be unacceptable....
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869 citations
Cites background from "Design and control of an LCL-filter..."
...However, these filters require high switching frequencies to acceptably attenuate switching harmonics, particularly in weak-grid applications where the supply is sensitive to these harmonics....
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797 citations
Additional excerpts
...Regarding filters, typically an LCL-filter is the adopted solution to attenuate PWM harmonics [33] but in the case a diode-bridge is adopted on the generator side and in the case of higher power WTS have also strict demands to grid voltage harmonics, trap filters might also be adopted....
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736 citations
References
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"Design and control of an LCL-filter..." refers background in this paper
...Hence, the damping value is set to a similar order of magnitude as the series capacitor impedance at the resonant frequency [ 26 ]....
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...... of the left side of the plane it is clear that the system is close to the border of the stability region without damping (zeros and poles numbered with 1 in Fig. 7). If a 10damping resistor is used then the system becomes more stable (zeros and poles numbered with 2 in Fig. 7). It is commented that stability analysis relating to resonance dynamics becomes less reliable as the sampling frequency approaches twice the resonant frequency [ 26 ]....
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...Also, a disturbance can trigger a reaction from the closed-loop current controller (e.g., caused by a PWM modulator with a wide spectrum spread between the fundamental and the switching frequency harmonics, by an A/D characterized by poor resolution, by inadequate filters on the measured grid voltage [14], [ 26 ], or by an external disturbance such as a load connected to the same point of common coupling (PCC) [17])....
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419 citations
"Design and control of an LCL-filter..." refers background in this paper
...A further issue for a VSC is high-frequency electromagnetic interference (EMI) (differential mode and common mode) [8], which needs specific filters (passive [9], [10] or active [11]) in frequency ranges above 150 kHz and rated at lower power...
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