A new scheme for power factor correction and active filtering for six-pulse converters loads

Abstract

Abstract. This paper presents a novel harmonic-free power factor correction (PFC) topology based on T-type active power filter (APF), which is dedicated for power factor improvement and harmonic filtering for six-pulse converter loads. The cascaded controller structure is adopted for the proposed system, namely, the inner current loop and outer voltage loop. The current-loop control scheme is based on a decoupled state-space equations of the T-type APF using separate proportional-integral (PI) controllers in d-axis and q-axis of the synchronous rotating reference frame (SRRF) synchronized with grid voltages, respectively. The fundamental components of load-side currents are feed forwarded in the current-loop using two groups of synchronous frame adaptive linear neural networks (ADALINEs) to ensure estimation accuracy and a fast dynamic response. A separate proportional-integral (PI) controller is adopted in the outer voltage loop for balancing the active power flow of the voltage source inverter (VSI) dc-side capacitor. The experimental results confirm well with the theoretical analysis.

Modeling, Control and Experimental Investigation of a Novel DSTATCOM Based on Cascaded H-bridge Multilevel Inverter

“…[1][2][3][4]. Among all forms of the power quality issues, the voltage fluctuations or sag/swell problems were recognized as the most costly events in the modern assembly lines and commercial offices [5][6][7][8]. On the other hand, the increasing power quality problems have stimulated a great potential for the industry to devise the power quality mitigation and compensation devices.…”

“…For instance, the static synchronous compensator for the distribution system (DSTATCOM) was proposed in [5] to solve the voltage sag and flicker problems. In [6][7][8], new compensation schemes for the voltage flicker problem were presented and the combined compensation scheme based on the active power filter (APF) and switching capacitors was implemented in a typical electrical distribution system for the automobile industry.…”

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“…Curves of the daily loading on the Polish EPS: ignoring the additional power for charging EVs, curve (1), are visible in Fig. 25; taking into account this power throughout the day with a coincidence factor of 0.5, curve (2); and with charging power restricted by time through an EPS operator within the hours, e.g., 21:30 to 7:30 it shows that by introducing certain procedures by EPS operator, in grids with V2G or V2H technology it would allow a balancing of the daily load curve [65][66][67][68][69][70][71]. Additionally, a systematic solution in the form of differential tariff calculations for consumed or uploaded energy in relation to the time of day might lead to both V2G and V2H technologies becoming additional instruments in the hands of the EPS operator, instruments leading to an increase in the reliability of the power system, mainly at the level of low voltage grids.…”

CM voltage compensation in AC/DC/AC interfaces for smart grids

“…A typical approach to conducted EMI reduction [17][18][19][20][21] bases on the application of the CM and DM filters that increase the impedance of the EMI current paths in conducted EMI frequency range. However, these solutions may bring about many side effects [9,12] such as creation of various resonant frequencies in system with uncontrolled paths for the passage of EMI currents generated in nearby circuits, lowering of the path damping factor due to introduction of additional series inductance, increasing of the EDM current amplitudes with lowered awaiting time to puncture Fig.…”