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This paper proposed a novel parallel passive damping topology for LCL-filter, which consists of damping resistors paralleled with grid side inductor and damping inductors connected in series with filter capacitance. The proposed filter could improve the harmonic attenuation with lower losses. Damping losses and harmonic suppressions of different filtering topologies were presented and it was found...
Hybrid filters could restrain harmonic current in distribution power-line effectively and their compensation precision relies heavily on the design of current loop controllers. Since the reference and feedback signals of the current loop controller are composed by different harmonic components and the bandwidth of conventional proportional controller is limited, this controller cannot control the...
Shunt Active Power Filters (APFs) are suitable to compensate current-type harmonics generated by nonlinear load, but large power and high compensation precision is difficult to be obtained due to low switching frequency of high power switch devices e.g. IGBTs and phase lag of digital control loop. In this paper, a high equivalent switching frequency is obtained in spite of low real switching frequency...
Shunt Active Power Filters (SAPF) could restrain harmonic current in distribution grid effectively and their compensation precision relies heavily on the design of current loop controllers. Since the reference and feedback signal of the current controller are composed by different harmonic components and the bandwidth of conventional ProportionIntegral (PI) controller is limited, this controller cannot...
Shunt Active Power Filters (SAPF) have been proved to be an effective approach to eliminate harmonic current in power grids. The DC voltage control during dynamic processes is critical for the safe and performance of the SAPF. In this paper, soft startup and impact suppression techniques are proposed to guarantee no voltage overshoots or sags in DC bus during startup and other dynamic processes. Subsequently,...
In active power filter (APF) application, LCL-filters are prevalently served as output filters due to high slew rate of compensation current and sufficient attenuation ratio for switching frequency with small LC parameters. In order to realize the stable control of LCL filters, appropriate damping is required. Both the classical PI control method with a damping resistor and active damping without...
Shunt hybrid active power filter (HAPF) which consists of both active and passive parts has a lot of attractive points, e.g. suitable for high power and/or high voltage application, cost-effective initial investment and convenient for connection etc. However, popular HAPF configurations are confronted larger active part's capacity, discontinuous impedance in frequency domain and sensitive to passive...
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