Abstract
In this study, the equation for the reactive and harmonic power compensation of a shunt active power filter (APF) system has been derived by studying the power exchange mechanism and power tetrahedron phasor diagram. The switching dynamics of a voltage source inverter (VSI)-based three-phase, three-wire (three-leg /half-bridge) shunt APF system with hysteresis band current control has been studied and verified by simulation. The relation between the design parameters and their effects on the active losses has also been identified. Detailed calculation and extensive simulation have been performed for a three-phase, three-wire shunt APF implemented in a 400VL-L distribution system, as an example, to study the effects of design parameter selection and their role in active power loss calculation. Simulated and calculated results are presented for the important design parameters for different switching frequencies together with their associated losses and kVA ratings. The procedure can be followed to design the parameters for other topologies, such as three-phase, four-wire or single-phase systems.
Highlights
Technological advancement in power generation from conventional and non-conventional sources, exploitation of renewable energy sources and their integration into supply networks and final utilization by highly sophisticated devices in the end users’ equipment has increased the awareness of the quality and reliability/security of the power supply
This paper presents a step by step procedure of parameter selection for the design of an Active Power Filter (APF) to compensate the harmonic current, generated by the load, with the following contributions;
Equations for reactive and harmonic power compensation have been derived for a shunt APF system by analyzing the power exchange mechanism and power tetrahedron phasor diagram
Summary
Technological advancement in power generation from conventional and non-conventional sources, exploitation of renewable energy sources and their integration into supply networks and final utilization by highly sophisticated devices in the end users’ equipment has increased the awareness of the quality and reliability/security of the power supply. Based on the switching dynamics and power exchange mechanism, the relation among the different parameters such as switching frequency (fsw), VSI output voltage (vsh), voltage at PCC (vpcc), DC capacitor voltage (Vdc), compensating current (ish), hysteresis band (h), interfacing inductor (Lsh) and their effect on total power loss of the filter (Ploss) have been identified. This paper presents a step by step procedure of parameter selection for the design of an APF to compensate the harmonic current, generated by the load, with the following contributions;. For circuit simplicity and to describe the compensating power exchange mechanism between the APFsh and grid PCC, a working diagram for phase A is shown, where Sw represents the switch of the switching devices. According to Kirchhoff’s voltage law, the basic equations for the capacitive and inductive mode can be derived as; vsh − vpcc −
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