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Improving performance, energy efficiency and reduced carbon emissions in industrial installations require the enhancement of power quality and reduced EMC/EMI emissions. In this frame, active power filters for improving power factor and harmonics mitigation are gaining interest as FACT devices for smart power networks. This work presents the simulation and analysis of a predictive control method applied...
A novel harmonic suppression rectifier transformer and its filter system based on transformer inductive filtering technology is proposed in this paper for the electrolytic rectifier system. The proposed rectifier transformer adopts three-winding structure, in which, the power winding at the primary side adopts star connection scheme, and both load and filter windings at the secondary side adopt delta...
A medium power Current Source Converter (CSC) based Active Power Filter (APF) system is designed and implemented to suppress the amplification of low order harmonics at the Medium Voltage (MV) interface bus between the distribution and transmission systems, owing to the presence of large shunt capacitor banks installed only for reactive power compensation. For this purpose, four CSC based APF units...
The paper presents considerations how application of high power inverter-based power supply units affects supply conditions of industrial plants as well as how it influences power quality in MV power supply grids. Scope of the paper topics covers the effect of LC resonance that occurs between an output filter of the inverter, active compensating filters and inductances of the power supplying grid...
The repetitive control and resonant control are widely used in grid-connected voltage-source converters recently, such as uninterruptible power supplies (UPS), photovoltaic inverter (PV) and active power filter (APF). This paper introduces a new repetitive control strategy in APF system, whose repetitive period is only one half of the traditional and could eliminate all odd harmonics as a bank of...
As a compromise between economy and good performance, this paper adopts the combined system using active power filter (APF) and static var compensator (SVC) to compensate reactive power and harmonic currents simultaneously. The SVC is constructed by fixed capacitor (FC) and thyristor controlled reactor (TCR), and the APF is constructed by a voltage source converter and its filter reactor. SVC acts...
The repetitive control has been widely used in grid connected voltage source converters, such as uninterruptible power supplies (UPS), photovoltaic inverter (PV) and active power filter (APF). This paper introduces a new repetitive control strategy in the APF system; the proposed control strategy has a forgetting factor (FF), which could improve control system robustness. Control system stability...
The model and the normal control method of the cascaded H-bridge active power filter is described firstly in this paper. However, problems exist in the normal control. One of the main problems is the unbalance of DC capacitor voltages of the H-bridge units. In this paper, an improved method for DC capacitor voltages control of the cascaded H-bridge active power filter is presented. With slightly shifting...
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