Step by step design of a high order power filter for three-phase three-wire grid-connected inverter in renewable energy system

Huang, Min; Blaabjerg, Frede; Yang, Yongheng; Wu, Weimin

doi:10.1109/pedg.2013.6785603

Cited by 42 publications

(22 citation statements)

References 9 publications

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“…Table I shows the main parameters of the NPC grid side converter. The LCL damping circuit can have different configurations [2], [7][8][9]. LCL filter with a damping resistor in series with the capacitor involves high losses in the resistor, mainly caused by the fundamental component.…”

Section: Converter Structure Parameters and Specificationsmentioning

confidence: 99%

<italic>LCL</italic> Grid Filter Design of a Multimegawatt Medium-Voltage Converter for Offshore Wind Turbine Using SHEPWM Modulation

Zabaleta

Burguete

Madariaga

et al. 2016

IEEE Trans. Power Electron.

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Abstract-The switching frequency of medium-voltage high power converters is limited to about 1 kHz due to semiconductor junction temperature constraint. The frequency band between the fundamental and carrier frequency is limited to a little more than one decade and the LCL filter design is usually a challenge to meet grid codes for grid connected applications. Traditional designs focus on the optimization of the filter parameters and different damping circuits. However, this design is very influenced by the modulation technique and produced low order harmonics. Widely used pulse width modulations (PWM), such as phase disposition PWM (PDPWM), produce low order harmonics that constraint the design of the filter. Selective harmonic elimination PWM (SHEPWM) can eliminate theses low order harmonics, enabling a more efficient design of the LCL filter. In this paper, the LCL grid filter of a Multi-Megawatt Medium-Voltage neutral point clamped (NPC) converter for a wind turbine is redesigned using SHEPWM modulation. Experimental results demonstrate that the efficiency of the converter, filter and overall efficiency are increased compared to that obtained with PDPWM.Index Terms-LCL filter, medium-voltage converter, selective harmonic elimination, SHE.

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Section: Converter Structure Parameters and Specificationsmentioning

confidence: 99%

<italic>LCL</italic> Grid Filter Design of a Multimegawatt Medium-Voltage Converter for Offshore Wind Turbine Using SHEPWM Modulation

Zabaleta

Burguete

Madariaga

et al. 2016

IEEE Trans. Power Electron.

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show abstract

“…The dominant harmonics of the grid-side current of the LLCL filter will be around the double of the switching frequency since the harmonics around the switching frequency are attenuated by the trap circuit L f -C f . That is the reason LLCL filter has smaller inductance or capacitance than LCL filter when they meet the same harmonic requirement of the grid-injected current (18) . According to (2), the resonant frequency of the LLCL filter can be higher than the resonant frequency of the LCL filter due to the smaller size.…”

Section: Modeling Of Llcl-filter-based Grid-connected Invertermentioning

confidence: 99%

Stability Analysis and Active Damping for <i>LLCL</i>-Filter-Based Grid-Connected Inverters

Huang¹,

Wang²,

Loh³

et al. 2015

IEEJ Journal IA

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A higher-order passive power filter (LLCL filter) for a grid-connected inverter is becoming attractive for the industrial applications owing to the possibility of reducing the cost of copper and the magnetic material. To avoid the well-known resonance problems of the LLCL filter, it is necessary to use either passive or active damping methods. In this study, the stability of the LLCL-filter-based grid-connected inverter is analyzed and a critical resonant frequency for the LLCL filter is identified when sampling and transport delays are considered. In the high-resonant-frequency region, active damping is not required; however, active damping is necessary in the low-resonant-frequency region. The basic LLCL resonance damping properties of different feedback states based on a notch filter concept are also studied. Then, an active damping method using capacitor current feedback for the LLCL filter is introduced. On the basis of this active damping method, a design procedure for the controller is given. Last, both simulation and experimental results are provided to validate the theoretical analysis of this study.

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“…Fig. 2 shows bode plots of transfer functions ig (s)/Uj (s) of LCL-filter and LLCL filter when they meet the same harmonic requirement of grid-injected current according to IEEE 519-1992 [ 19]. It can be seen from Fig.…”

Section: Grid-connected Invertermentioning

confidence: 99%

“…Table I shows the parameters of the selected test system. Table II shows the parameters of the LLCL-filter in different resonant frequencies cases according to the design method given in [19].…”

Section: Grid-connected Invertermentioning

confidence: 99%

Stability analysis and active damping for LLCL-filter based grid-connected inverters

Huang

Blaabjerg

Loh

et al. 2014

2014 International Power Electronics Conference (IPEC-Hiroshima 2014 - ECCE ASIA)

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A higher order passive power filter (LLCL filter) for the grid-tied inverter is becoming attractive for the industrial applications due to the possibility to reduce the cost of the copper and the magnetic material. To avoid the well-known stability problems of the LLCL-filter it is requested to use either passive or active damping methods. This paper analyzes the stability when damping is required and when damping is not necessary considering sampling and transport delay. Basic LLCL resonance damping properties of different feedback states are also studied. Then an active damping method which is using the capacitor current feedback for LLCL-filter is introduced. Based on this method, a design procedure for the control method is given. Last, both simulation and experimental results are provided to validate the theoretical analysis of this paper.

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Step by step design of a high order power filter for three-phase three-wire grid-connected inverter in renewable energy system

Cited by 42 publications

References 9 publications

<italic>LCL</italic> Grid Filter Design of a Multimegawatt Medium-Voltage Converter for Offshore Wind Turbine Using SHEPWM Modulation

<italic>LCL</italic> Grid Filter Design of a Multimegawatt Medium-Voltage Converter for Offshore Wind Turbine Using SHEPWM Modulation

Stability Analysis and Active Damping for <i>LLCL</i>-Filter-Based Grid-Connected Inverters

Stability analysis and active damping for LLCL-filter based grid-connected inverters

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