New Control Method of Active Power Quality Compensator with Reduced-Capacity Three-Leg Inverter for Electrified Railways

2009 ◽  
Vol 129 (9) ◽  
pp. 907-913
Author(s):  
Norio Ishikura ◽  
Eiji Hiraki ◽  
Toshihiko Tanaka
Keyword(s):  
Power Quality ◽  
Control Method ◽  
Active Power ◽  
Electrified Railways

scholarly journals Improving Power Quality by a Four-Wire Shunt Active Power Filter: A Case Study

Energies ◽  
2021 ◽  
Vol 14 (7) ◽  
pp. 1951
Author(s):  
Mihaela Popescu ◽  
Alexandru Bitoleanu ◽  
Mihaita Linca ◽  
Constantin Vlad Suru
Keyword(s):  
Power Quality ◽  
Quality Indicators ◽  
Reactive Power ◽  
Control Method ◽  
Active Power Filter ◽  
Active Power ◽  
Current Control ◽  
Shunt Active Power Filter ◽  
Power Filter ◽  
Unbalanced Load

This paper presents the use of a three-phase four-wire shunt active power filter to improve the power quality in the Department of Industrial Electronics of a large enterprise from Romania. The specificity is given by the predominant existence of single-phase consumers (such as personal computers, printers, lighting and AC equipment). In order to identify the power quality indicators and ways to improve them, an A-class analyzer was used to record the electrical quantities and energy parameters in the point of common coupling (PCC) with the nonlinear loads for 27 h. The analysis shows that, in order to improve the power quality in PCC, three goals must be achieved: the compensation of the distortion power, the compensation of the reactive power and the compensation of the load unbalance. By using the conceived three-leg shunt active power filter, controlled through the indirect current control method in an original variant, the power quality at the supply side is very much improved. In the proposed control algorithm, the prescribed active current is obtained as a sum of the loss current provided by the DC voltage and the equivalent active current of the unbalanced load. The performance associated with each objective of the compensation is presented and analyzed. The results show that all the power quality indicators meet the specific standards and regulations and prove the validity of the proposed solution.

scholarly journals A Half-bridge Inverter Based Active Power Quality Compensator for Electrified Railways

2012 ◽  
Vol 37 (0) ◽  
pp. 146-152
Author(s):  
Tint Soe Win ◽  
Y Baba ◽  
M Okamoto ◽  
E Hiraki ◽  
T Tanaka
Keyword(s):  
Power Quality ◽  
Active Power ◽  
Electrified Railways

Power Quality Enhancement in Four-Wire Systems under different distributed Energy Resource Penetrations

2021 ◽  
Vol 69 (4) ◽  
pp. 50-58
Author(s):  
Mohamed ELBAR ◽  
◽  
Imad MERZOUK ◽  
Abdelkader BEALDEL ◽  
Mohamed Mounir REZAOUI ◽  
...  
Keyword(s):  
Power Quality ◽  
Power Supply ◽  
Control Method ◽  
Energy Resource ◽  
Active Power Filter ◽  
Active Power ◽  
Nonlinear Loads ◽  
Control Approach ◽  
Power Filter ◽  
Filtering Function

Reactive and harmonic currents that are being injected into the power supply by nonlinear loads, cause an increasing deterioration of the power system voltages and currents, whereas active power filter (APF) has been widely used to overcome this problem and to improve the power quality delivered by the power supply. In this paper, a three-level four-legged active power filter based on a neutral-point-clamped (NPC) inverter is presented. To fulfil the requirement of the active power filtering function under balanced, unbalanced, and distorted (including 3rd and 5th harmonics) power supply voltages, a control method based on the instantaneous power theory has been used and discussed. On the other side, the inverter switching state control has been achieved based on PWM current controller. The performance of the proposed topology under the control approach has been finally discussed through the obtained simulation results.

Dual-loop generalized predictive control method for two-phase three-wire railway active power quality controller

2020 ◽  
pp. 014233122093247 ◽  
Author(s):  
Hamed Jafari Kaleybar ◽  
Morris Brenna ◽  
Federica Foiadelli
Keyword(s):  
Control System ◽  
Power Quality ◽  
Predictive Control ◽  
Reactive Power ◽  
Control Method ◽  
Fast Response ◽  
Active Power ◽  
Two Phase ◽  
Power Substation ◽  
Quality Controller

One of the most challenging topics in electric railway networks (ERNs) is power quality (PQ) problems caused by single-phase feeding of time-varying and high-power locomotives. During previous years, many techniques and compensators have been offered to alleviate these problems. Railway active power quality controller (RAPQC) is considered as one of the most efficient approaches. Due to the time-variant, uncertainty and distorted features of ERNs, the controlling of RAPQCs has always been a substantial concern to experts. This paper presents, a new robust control system for two-phase three-wire RAPQC (ThRAPQC) based on generalized model predictive control integrated with modified instantaneous reactive power theory (GMPC-MIRP). A dual-loop balancing system has been adopted in the proposed control system to equalize the active powers of traction power substation (TPSS) adjacent feeders, compensate reactive powers and suppress harmonic simultaneously. The performance of the proposed method in comparison with the conventional Fryze-Buchholz-Depenbrock (FBD)-based current strategy together with hysteresis current controller (FBD-HCC) has been evaluated through the detailed simulations and Opal-RT 5600-based laboratory setup results. The fast response, high precision, lower fluctuation in reference current tracking and high capability of working in distorted conditions are the outstanding privileges of the proposed method that are confirmed by the output results.

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