scholarly journals Modeling and Control of a Novel Hybrid Power Quality Compensation System for 25-kV Electrified Railway

Energies ◽  
2019 ◽  
Vol 12 (17) ◽  
pp. 3303 ◽  
Author(s):  
Minwu Chen ◽  
Yinyu Chen ◽  
Mingchi Wei
Keyword(s):  
Power Quality ◽  
Power Flow ◽  
Reactive Power ◽  
Compensation System ◽  
Modeling And Control ◽  
Voltage Unbalance ◽  
Hybrid Power ◽  
Traction Power Supply System ◽  
Traction Power Supply ◽  
And Control

The severe power quality problems aroused by the single-phase 25-kV traction power supply system (TPSS), especially for the voltage unbalance (VU) and high-frequency harmonic resonance, have attracted increasing attention nowadays. In this paper, a novel hybrid power quality compensation system, including a power flow controller (PFC) and thyristor-controlled L and C-type filter (TCL-CTF), is proposed. The PFC can be used for VU compensation, and the TCL-CTF can be designed to filter out harmonics as well as compensate reactive power. Furthermore, an optimized compensation strategy is proposed, and the power quality of the TPSS can meet the requirements of the technology standard. Compared with the conventional scheme, the compensation capacity of the PFC can be reduced by 12%, as well as the cost. Finally, the effectiveness of the proposed system is verified by the simulation and experimental results.

Electrical magnetic hybrid power quality compensation system for V/V traction power supply system

2016 ◽  
Vol 9 (1) ◽  
pp. 62-70 ◽  
Author(s):  
Baichao Chen ◽  
Chenmeng Zhang ◽  
Wenjun Zeng ◽  
Gang Xue ◽  
Cuihua Tian ◽  
...  
Keyword(s):  
Power Quality ◽  
Power Supply ◽  
Power Supply System ◽  
Supply System ◽  
Compensation System ◽  
Hybrid Power ◽  
Traction Power Supply System ◽  
Traction Power Supply ◽  
Traction Power

scholarly journals Improvement of Quadruple Structure and Optimization of Control Algorithm for Co-Phase Traction Power Supply System

2020 ◽  
Vol 38 (5) ◽  
pp. 1112-1121
Author(s):  
Shu Cheng ◽  
Chang Liu ◽  
Jianxiang Tang ◽  
Tianjian Yu ◽  
Kaidi Li
Keyword(s):  
Power Supply ◽  
Control Algorithm ◽  
Power Supply System ◽  
Reactive Power ◽  
Supply System ◽  
System Structure ◽  
Traction Power Supply System ◽  
Traction Power Supply ◽  
And Control ◽  
Traction Power

Co-phase power supply is one of the key technologies to solve the technical bottlenecks such as electrical phase separation zone, poor power quality and defects in structure and control algorithms in traditional traction power supply systems and single co-phase power supply schemes, and an inevitable way to realize the development of electrified railways in the direction of safety, high speed and heavy load. Based on the single co-phase power supply technology, a novel quadruple co-phase power supply scheme with negative sequence elimination and to suppress reactive power and harmonic better for the two aspects of the system structure improvement and control algorithm optimization is proposed by combining the technologies of power system flexible transmission grid-connected and multiple inverters. Finally, the simulation model for the novel co-phase traction power supply system was designed and built, and the present method was verified by a set of simulation experiments so as to obtain the expected results.

scholarly journals Application of ETAPTM eTraXTM software package for digital simulation of distribution network that feeds an AC traction power supply system

2020 ◽  
Vol 209 ◽  
pp. 07011
Author(s):  
Vladimir Tulsky ◽  
Maxim Shevlyugin ◽  
Aleksei Korolev ◽  
Kamil Subhanverdiev ◽  
Alexander Murzintsev ◽  
...  
Keyword(s):  
Power System ◽  
Power Supply ◽  
Power Flow ◽  
Power Supply System ◽  
Distribution Network ◽  
Supply System ◽  
Voltage Unbalance ◽  
Traction Power Supply System ◽  
Traction Power Supply ◽  
Traction Power

Voltage unbalance in power systems feeding AC traction power systems is a worldwide known problem. One of the main aspects of this problem is the negative effect of voltage unbalance on motor loads causing operating problems and economic damage. It is necessary to perform unbalanced power flow studies and calculate voltage unbalance indexes to assess this negative effect of voltage unbalance and the develop of compensating measures during the design stage. Usually, calculations of the AC traction power supply system and the distribution network feeding it are carried out separately during the design of new lines of railways electrified by alternating current (AC) and reconstructing of existing ones. This approach is a source of deviations in the power flow studies because the lack of consideration of mutual influences between the traction power system and the distribution power system. In this paper, we compare a digital model in which the traction power supply system and the distribution network are modeled separately with a model that considers mutual influences between the traction and external power supply systems, including power flows through the traction network caused by the distribution network (transit currents). For digital modeling of these processes, authors used ETAPTM software with eTraXTM package. It allows to run unbalanced power flow studies when the generation and load are being changed over time, including train movement. During a separate simulation of the traction power system and distribution network, traction network was modelled using the equivalent sources connected to traction substation buses and the distribution network was modeled taking into account the fact that traction load was given from the simulation of the traction power system. The traction load was considered as lumped loads connected to the traction substation buses.At the same time, in both cases, the unbalanced power flow study was carried out by the phase domain method. Based on the results of two models comparison, it was concluded that the combined model containing a traction power supply system and distribution network, is more effective in terms of improving the accuracy of assessment voltage unbalance in accordance with current regulatory and technical documents on power quality.

scholarly journals Hybrid Power Quality Compensation System for Electric Railway Supplied by the Hypotenuse of a Scott Transformer

IEEE Access ◽  
2020 ◽  
Vol 8 ◽  
pp. 227024-227035
Author(s):  
Leilei Zhao ◽  
Mingli Wu ◽  
Qiujiang Liu ◽  
Peng Peng ◽  
Jing Li
Keyword(s):  
Power Quality ◽  
Compensation System ◽  
Hybrid Power ◽  
Electric Railway

scholarly journals From Hierarchical Control to Flexible Interactive Electricity Services: A Path to Decarbonization

2021 ◽  
Vol 15 ◽  
pp. 1558-1570
Author(s):  
Marija D. Ilic ◽  
Pedro M. S. Carvalho
Keyword(s):  
Power Flow ◽  
Distribution Systems ◽  
Reactive Power ◽  
Hierarchical Control ◽  
Electric Energy ◽  
Specific Model ◽  
Net Energy ◽  
Primary Control ◽  
Interaction Variables ◽  
And Control

We propose to conceptualise electric energy systems as complex dynamical systems using physically intuitive multilayered energy modelling as the basis for systematic diverse technology integration, and control in on-line operations. It is shown that such modelling exhibits unique structure which comes from the conservation of instantaneous power (P) and of instantaneous reactive power ( _Q), (interaction variables (intVar)) at the interfaces of subsystems. The intVars are used as a means to model and control the interactive zoomed-out inter-modular (inter-area, inter-component) system dynamics. Control co-design can then be pursued using these models so that the primary control shapes intVars of its own module by using its own lowlevel detailed technology-specific model and intVar info exchange with the neighbours. As a result, we describe how the proposed approach can be used to support orderly evolution from today’s hierarchical control to a platform enabling flexible interactive protocols for electricity services. The potential for practical use of the proposed concepts is far-reaching and transparent. All that needs to be conceived is that intVar characterising any intelligent Balancing Authority (iBA) is a generalisation of today’s Area Control Error (ACE) characterising net energy balance of a Balancing Authority (BA). An iBA can be any subsystem with its own sub-objectives, such as distributed energy resources (DERs) comprising customers and grid forming microgrids; distribution systems; transmission systems; Independent System Operators (ISOs); and, ultimately, electric energy markets within large interconnection. Several industry problems are described as particular sub-problems of general interactive electricity services. These formulations help one compare models and assumptions used as part of current solutions, and propose enhanced solutions. Most generally, feasibility and stability conditions can be introduced for ensuring feasible power flow solutions, regulated frequency and voltage and orderly power exchange across the iBAs.

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