Forming of Current of the Single-Phase Grid Inverter of Local Combined Power Supply System with a Photovoltaic Solar Battery

2018 ◽  
Author(s):  
Olexandr Shavolkin ◽  
Iryna Shvedchykova
Keyword(s):  
Power Supply ◽  
Power Supply System ◽  
Single Phase ◽  
Supply System ◽  
Solar Battery ◽  
Combined Power Supply

scholarly journals Research on Control Strategy of AC-DC-AC Substation Based on Modular Multilevel Converter

2017 ◽  
Vol 2017 ◽  
pp. 1-14 ◽  
Author(s):  
Fei Chang ◽  
Zhongping Yang ◽  
Fei Lin
Keyword(s):  
Power Supply ◽  
Power Supply System ◽  
Single Phase ◽  
Supply System ◽  
Multilevel Converter ◽  
Traction Power Supply System ◽  
Three Phase ◽  
Phase Converter ◽  
Traction Power Supply ◽  
Traction Power

Significant disadvantages in power quality especially the unbalance problem and neutral sections restrict the evolution of conventional traction power supply system. A new traction power supply system based on three-phase to single-phase converter is studied, which can transfer active power from three-phase grid to single-phase catenary. One catenary section could be utilized in the new traction power supply system instead of the multiple split sections in conventional system. Three-phase to single-phase converter is the core equipment of new traction power system. MMC (modular multilevel converter) structure of AC-DC-AC substation is proposed in this paper. To solve the problem of the capacitor voltage balancing in MMC, a parallel sorting algorithm based on field programmable gate array (FPGA) is studied. And the correctness and effectiveness of the algorithm are verified by experiments. In addition, it is inevitable that the AC grid voltage will be unbalanced caused by the fault in the new system. Therefore, this paper focuses on the analysis of the effect of the unbalanced grid voltage on the operating characteristics of the MMC system. Finally, the correctness of the theoretical analysis is verified by simulation.

scholarly journals A Novel Co-Phase Power Supply System for Electrified Railway Based on V Type Connection Traction Transformer

Energies ◽  
2021 ◽  
Vol 14 (4) ◽  
pp. 1214
Author(s):  
Shaofeng Xie ◽  
Yiming Zhang ◽  
Hui Wang
Keyword(s):  
Power Supply ◽  
High Speed ◽  
Power Supply System ◽  
Single Phase ◽  
Supply System ◽  
Technical Problems ◽  
Electrified Railway ◽  
Traction Power Supply ◽  
Universal Applicability ◽  
Neutral Section

Power quality and neutral section are two technical problems that hinder the development of electrified railway to high-speed and heavy railway. The co-phase power supply technology is one of the best ways to solve these two technical problems. At present, a V type connection traction transformer is widely used in a power frequency single-phase AC traction power supply system, especially in high-speed railway. In this paper, a new type of co-phase power supply system for electrified railway based on V type connection traction transformer is proposed. One single-phase winding in the V type connection traction transformer is used as main power supply channel, and three ports are used as compensation ports. Neutral section is no longer set with traction substation, and the train is continuously powered through. The independent single-phase Static Var Generators (SVGs) are used to compensate the three-phase imbalance caused by single-phase traction load. When necessary, the power factor can be improved at the same time. The principle, structure, control strategy, and capacity configuration of the technical scheme are analyzed in this paper, and the effectiveness of the scheme is verified by using the measured data of electrified railway. The advantage of this scheme lies in the universal applicability of the V type connection traction transformer, and the flexibility of the SVG device.

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