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In this paper, a sensorless active damping scheme of LCL-filter is proposed in grid-connected parallel inverters for battery energy storage systems. The proposed damping method is superior to the conventional notch filter and virtual damping methods with respect of robustness on the variation of resonance of the filter and unnecessary additional current sensors. The theoretical analysis of the proposed...
The resonance problem in multi-paralleled grid-connected inverters in microgrid is more complex than single one. The Norton's equivalent circuit associated with grid-connected inverter with LCL filter is figured out in this paper. And in terms of different reasons of causing resonance, resonance problems associated with multi-paralleled grid-connected inverters are categorized into three types: individual...
Compared with LCL filter, an LLCL-filter is characterized with smaller size and lower cost for grid-connected inverters. But this high order filter may also have resonant problem which will affect the system stability. Many methods can be used to alleviate the resonant problem including active damping, passive damping or even without damping if it is designed conservative. In this paper, an overview...
In order to fulfill the grid codes and meet power quality requirements in grid connected converters without increasing the switching frequency or system size, higher order line filters are used. This paper considers the active damping of LCL filters in grid connected converters. The proportional feedback of the last two samples of the filter capacitor current for the purpose of active damping is analyzed...
High power converters adopted in oil and gas applications or in wind turbine applications can benefit from the introduction of medium voltage multilevel inverters, in terms of volume and efficiency. The low switching frequency lead to currents characterized by an high harmonic content despite the use of multilevel technology, hence to high filtering needs. The use of LCL-filter is the solution to...
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