Power quality enhancement by SiC Active Power Filters in Oil and Gas Platforms

Abstract

This paper presents a study for active power filters' (APFs) application in a typical offshore O&G platform, where reactive power compensation and current harmonic mitigation are often needed to meet minimum power quality requirements. As size and weight are critical constraints in offshore installations, possible benefits of using Silicon Carbide (SiC) switches for the APF implementation are also investigated. Different compensation strategies have been compared, varying the connection point of the APF between two different voltage levels and assigning the APFs different compensation targets. Improvements in Power Quality (PQ) indexes as well as APFs rating, efficiency and design complexity have been considered for both SiC and Silicon-based solutions to identify trade-offs suitable for the considered application.

Active Power Filter Pre-Selection Tool to Enhance the Power Quality in Oil and Gas Platforms

“…From Figure 6 , the transfer functions between PoC harmonic voltage (V h ) and nonlinear load harmonic current (I h ) for SCS and RLS are given by (16) and (17), respectively.…”

“…In [16], a chain circuit active power filter for high voltage and power applications is proposed, a prototype of 10 kV/1 MVA is built. However, although a preliminary analysis has been presented in [17], a holistic and detailed study bench-marking APF design and PQ performance for this specific application is not available in the literature.…”

“…With respect to [17], this paper details the description of the SAPF control scheme, with a thoroughly analytical analysis of the advantages of each compensation strategy, supported by additional results. Finally, the paper concludes by presenting an integrated SAPF pre-selection tool that allows to compare the different alternatives to identify the most suitable one.…”

Load Compensation by DSTATCOM with LCL-Filter by Comparing Different Resonance Damping Methods

“…Also, for the AD method, the converter voltage signals are modified by using P-controllers with a gain constant K d . Unlike for the shunt active power filters, where the load is balanced and nonlinear with zero neutral current, the DSTATCOM current controller should also incorporate a 0-axis controller for the compensation of the neutral load current (i l0 ) in the case of unbalanced loads [19]. In this study, a 0-axis controller was implemented in the dq0 reference frame using a PI-controller where i l0 was compared to the reference filter current i * f 0 .…”

“…Different topologies, reported in the literature for the DSTATCOMs, have incorporated four-leg VSCs, three single-phase VSCs, and three-leg VSCs with split capacitors, three-leg VSCs with zig-zag transformers [11], [19]. These topologies have been investigated using single reactor filters or different transformer topologies for the grid connection [20].…”