Using C‐type filter with partial compensation method for capacity reduction of hybrid power quality conditioner in co‐phase traction power system

Abstract

Hybrid power quality conditioner (HPQC) has been utilised in a co-phase electrified railway system with the aim of improving power quality indices. A C-type filter is designed as an auxiliary device alongside the HPQC for high-order harmonics mitigation in this paper. Alternatively, the C-type filter compensates a selected portion of load reactive power, while the HPQC compensates for the left required power. Furthermore, the HPQC mitigates grid side unbalance and other harmonics in a co-phase supplied system simultaneously. In addition, a design procedure of LCL filters is proposed to suppress high-order harmonic contents induced by the HPQC converters to achieve lower grid-side total harmonic distortion (THD). Moreover, a flexible partial compensation (PC) method considering the C-type filter effect on the HPQC performance is adapted to maintain the grid-side power quality indices in an acceptable range. The C-type filter and PC method provide VA rating reduction of the HPQC without applying any complication to the compensation control system. Finally, simulation and experimental results are presented to validate the feasibility and functionality of the proposed configuration.This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

Enhancement of power quality issues for a hybrid AC/DC microgrid based on optimization methods

“…The performance of PFCK is quite evident in the reduction of TH D i by nearly 50%. Furthermore, FIGURE 25 The iteration diagram of each of the proposed algorithms by considering and using the MAPF module, the output range of this component will be reduced to 2%.…”

“…The output results indicate the proper performance of the above system [11]. To cope with harmonic distortions in the power grid and especially MGs, numerous harmonic compensation approaches are presented in the literature [12][13][14][15][16][17][18][19][20][21][22][23][24][25][26]. For harmonic mitigation, two elements, active power filter and super capacitor, are investigated in [12].…”

“…The load voltage harmonics are reduced from 11.65% to 1.53% and the current harmonics are reduced from 30.97% to 2.24%, respectively. In [25], a C‐type filter is designed as an auxiliary device alongside the hybrid power quality conditioner (HPQC) for high‐order harmonics mitigation. Furthermore, the HPQC mitigates grid side unbalance and other harmonics in a co‐phase supplied system simultaneously.…”

Optimal C-type filter design for wireless power transfer system by using support vector machines

“…Furthermore, it has lower loss than highpass filter at fundamental frequency [14]. Due to these advantages, it is widely used in different applications such as loading capability improvement of transformers under non-sinusoidal conditions [15], filtration of higher harmonics injected into the transfer system by arc furnaces [16] and capacity reduction of hybrid power quality conditioner in co-phase traction power system [17].…”

An effective utilization scheme for regenerative braking energy based on power regulation with a genetic algorithm

“…Hence, the regenerative braking energy is either used by the accelerating trains in the same power arm or directly fed back to the utility grid through the traction substation (TS) [13]. The co-phase power supply system can realize the same phase of the voltage in the power supply sections of different substations along the whole line, cancel the electric phase separation links [14,15], prolong the power supply distance, expand the flow range of regenerative braking energy and help to improve the utilization rate of regenerative braking energy. However, different substations are still separated by sectional insulators, which essentially do not realize the connection of the whole line, and it is impossible to realize the sharing of regenerative braking energy among trains on the whole line.…”