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In this paper, a three-phase four-wire shunt active power filter (APF) is studied. In order to reduce voltage stress of power devices and improve the performance and practicality of APF in high voltage and capacity occasions, a hybrid cascade H-bridge seven-level converter is adopted as the main circuit of the APF. In system control, DC-link total voltage control is realized by transferring active...
The using of large numbers of airborne electronic equipments and electric actuators makes the performance and comfort of new aircraft improved with a leaping development. But it also introduces more harmonics into aircraft power systems. As the specificity of aircraft gird, conventional three-phase four-wire active power filter (APF) has its limitation in aircraft applications. A novel shunt three-phase...
The main circuit topology of active power filter is mainly based on the conventional phase-leg cell. The dead-time control should be introduced to avoid the “shoot-through” phenomenon. It may lead to the decrease of compensation performance. Another combination form of the conventional phase-leg cell, interleaved buck cell, is studied in this paper. Moreover, an interleaved buck cell based full-bridge...
With the progress of “more electric aircraft,” introducing active power filter (APF) technology into the aircraft power system to improve its quality and reliability catches growing interest. In this paper, based on the analysis and modeling of the shunt APF with close-loop control, a feedforward compensation path of load current is proposed to improve the dynamic performance of the APF. The two H-bridge...
With the progress of “More Electric Aircraft”, power capacity of aircraft electric power system is increased. It is not easy for the power-quality characteristics of the system to be in compliance with the harmonic standards by using traditional method to compensate the harmonics introduced by the nonlinear load. Active power filter (APF) gets increasing usage in 50Hz power system for its high performance...
Regular control of parallel active power filter (PAPF) based on the p-q theory is studied in this paper. After evolutional reduction of the control diagram and mathematic derivation of the p-q theory, a generalized conclusion is drawn: regular control scheme could be regarded as a composite control with feedback of dc-link voltage and feedforward of the fundamental load current; under different compensation...
In this paper, an optimal design method of three-phase rectifier with near-sinusoidal input currents (RNSIC) is proposed. By using the proposed method, high power factor could be achieved as well as low input current harmonics, making the converter more practical. Moreover, based on the operation principle analysis of RNSIC, characteristic of the rectifier is discussed. Experimental results form three...
In order to improve the distorted current of the conventional uncontrolled rectifier connected with the capacitance load, former researchers used to propose a new rectifier where inductors are series connect with the ac side and capacitors are parallel connected with the upper diodes. Although improved input current is achieved, the rectifier uses LC filter in the dc side, resulting in large size...
A three-phase rectifier with near-sinusoidal input currents is studied in this paper. Based on the analysis of the operation principle of this rectifier which can work in three modes: small current mode, medium current mode and large current mode, a practical design method used for the rectifier is proposed to obtain the optimum value of the passive components. Additionally, the characteristic of...
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