贯通式同相供电变流器研究
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摘要
贯通式同相供电系统是牵引供电系统未来重要发展方向之一。它能有效避免当前牵引供电系统的电能质量问题和过分相问题。我国学者提出的由平衡变压器和动态补偿装置(APC, Active Power Compensator)组成同相供电系统能大大改善牵引网电能质量,并可以将系统过分相个数减半。但该方案还难以实现整个牵引供电大系统范围内的同相贯通供电。
基于此,本文研究了一种基于贯通式同相牵引供电系统的三相-单相变流器。并以此三相-单相变流器作为牵引变电所核心设备,从而利用电力电子技术可以实现牵引网全线贯通供电,彻底取消过分相装置,实现三相负荷的对称以及牵引网侧的柔性可控,改善了电能质量,提高了系统效率,是一种新型的智能牵引供电系统。
本文主要研究了基于贯通式同相牵引供电系统的三相-单相变流器,深入分析了三相整流器和单相逆变器各自的拓扑结构,详尽分析了PI双闭环控制策略,设计了三相整流器的交流侧电感、直流侧电容以及单相逆变器的交流侧滤波电路。为了验证三相-单相变流器的控制策略及其性能,在Matlab/Simulink环境下分别搭建了三相整流器和单相逆变器的系统仿真模型。对于三相-单相变流器四象限运行进行了仿真,并深入研究了三相整流器和单相逆变器的性能。
本文研究了三相锁相环及单相锁相环,分析了三相锁相的结构和原理,并在FPGA平台上实验验证了其锁相性能。研究了一种新型单相锁相环(EPLL),并与传统的电力锁相环进行了对比仿真及实验研究。
本文搭建了两电平三相-单相变流器FPGA实验平台,制作调试了FPGA控制电路板及IGBT驱动电路板。运用Verilog HDL语言编写了PI控制模块、锁相环模块、abc到dq转换坐标变换模块程序等,并完成了基于PI双闭环控制的控制程序编写。在实验平台上,完成了三相整流器、单相逆变器以及三相-单相变流器实验研究。仿真及实验结果验证了本文研究的三相-单相变流器能适应牵引网的时变非线性负载并可以实时提供合理的功率输出,基于三相-单相变流器的贯通式同相供电系统是可行的。
Co-phase connected power supply system is one of the development direction if traction power supply system, which can solve the problem of power quality and phase separation of traditional traction power supply system effectively.Chinese scholars put forward the co-phase power supply system based on APC(Active Power Compensator) and balance transformer to solve the electrified railway power quality problem and meantime, reduce half number of the phase separation.But the two-phase output of APC connecting with traction transformer secondary side presents no impact to the phase of power supply arm. So if phase difference exists in adjacent substations, the continuous power supply will be hardly to accomplished.
So, a new type of co-phase connected power supply system based on three-phase to single-phase converter is brought up.It uses power electronic technology to cancel the neutral-section passing device completely, achieve the symmetrical of three-phase load and flexible control of traction network side, improve the quality of power and raise the efficiency of the system. It is a new type smart traction network.
The three-phase to single-phase converter of co-phase connected power supply system is mainly studied in this paper.The topology of the converter is analyzed and the control strategy based on PI double loop is introduced. The AC inductor of three-phase rectifier, DC capacitor and AC filter circuit of single-phase inverter are designed.To verify the control performance of three-phase to single-phase converter, the simulation models of three-phase rectifier and single-phase inverter are built in Matlab.Four quadrant operation simulation is made and the performances of the rectifier and invertei are analyzed,
A low power three-phase to single-phase converter based on FPGA experiment platform is built.The FPGA control circuit and IGBT driving circuit board is made and debugged.The three-phase rectifier and single-phase inverter experiments are completed on the platform.
Then, the three-phase PLL and single-phase PLL is studied.The structures and principles of three-phase and single-phase PLL are introduced, and the phase-locked performance is verified on the FPGA platform. EPLL,a new type single-phase PLL, is introduced and compared with the traditional power PLL by simulation and experiment.
基于此,本文研究了一种基于贯通式同相牵引供电系统的三相-单相变流器。并以此三相-单相变流器作为牵引变电所核心设备,从而利用电力电子技术可以实现牵引网全线贯通供电,彻底取消过分相装置,实现三相负荷的对称以及牵引网侧的柔性可控,改善了电能质量,提高了系统效率,是一种新型的智能牵引供电系统。
本文主要研究了基于贯通式同相牵引供电系统的三相-单相变流器,深入分析了三相整流器和单相逆变器各自的拓扑结构,详尽分析了PI双闭环控制策略,设计了三相整流器的交流侧电感、直流侧电容以及单相逆变器的交流侧滤波电路。为了验证三相-单相变流器的控制策略及其性能,在Matlab/Simulink环境下分别搭建了三相整流器和单相逆变器的系统仿真模型。对于三相-单相变流器四象限运行进行了仿真,并深入研究了三相整流器和单相逆变器的性能。
本文研究了三相锁相环及单相锁相环,分析了三相锁相的结构和原理,并在FPGA平台上实验验证了其锁相性能。研究了一种新型单相锁相环(EPLL),并与传统的电力锁相环进行了对比仿真及实验研究。
本文搭建了两电平三相-单相变流器FPGA实验平台,制作调试了FPGA控制电路板及IGBT驱动电路板。运用Verilog HDL语言编写了PI控制模块、锁相环模块、abc到dq转换坐标变换模块程序等,并完成了基于PI双闭环控制的控制程序编写。在实验平台上,完成了三相整流器、单相逆变器以及三相-单相变流器实验研究。仿真及实验结果验证了本文研究的三相-单相变流器能适应牵引网的时变非线性负载并可以实时提供合理的功率输出,基于三相-单相变流器的贯通式同相供电系统是可行的。
Co-phase connected power supply system is one of the development direction if traction power supply system, which can solve the problem of power quality and phase separation of traditional traction power supply system effectively.Chinese scholars put forward the co-phase power supply system based on APC(Active Power Compensator) and balance transformer to solve the electrified railway power quality problem and meantime, reduce half number of the phase separation.But the two-phase output of APC connecting with traction transformer secondary side presents no impact to the phase of power supply arm. So if phase difference exists in adjacent substations, the continuous power supply will be hardly to accomplished.
So, a new type of co-phase connected power supply system based on three-phase to single-phase converter is brought up.It uses power electronic technology to cancel the neutral-section passing device completely, achieve the symmetrical of three-phase load and flexible control of traction network side, improve the quality of power and raise the efficiency of the system. It is a new type smart traction network.
The three-phase to single-phase converter of co-phase connected power supply system is mainly studied in this paper.The topology of the converter is analyzed and the control strategy based on PI double loop is introduced. The AC inductor of three-phase rectifier, DC capacitor and AC filter circuit of single-phase inverter are designed.To verify the control performance of three-phase to single-phase converter, the simulation models of three-phase rectifier and single-phase inverter are built in Matlab.Four quadrant operation simulation is made and the performances of the rectifier and invertei are analyzed,
A low power three-phase to single-phase converter based on FPGA experiment platform is built.The FPGA control circuit and IGBT driving circuit board is made and debugged.The three-phase rectifier and single-phase inverter experiments are completed on the platform.
Then, the three-phase PLL and single-phase PLL is studied.The structures and principles of three-phase and single-phase PLL are introduced, and the phase-locked performance is verified on the FPGA platform. EPLL,a new type single-phase PLL, is introduced and compared with the traditional power PLL by simulation and experiment.
引文
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[6]张秀峰,李群湛,吕晓琴.基于有源滤波器的V,v接同相供电系统[J].中国铁道科学.2006,27(2)：98-103.
[7]曾国宏,郝荣泰.基于有源滤波器和阻抗匹配平衡变压器的同相供电系统[J].铁道学报.2003,25(3)：49-54.
[8]张秀峰,连级三.利用电力电子技术构建的新型牵引供电系统[J].变流技术与电力牵引.2007,3：4-7.
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[10]李猛.新型同相牵引供电系统仿真的研究[J].大连交通大学硕士学位论文.2008.
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[13]Zeliang Shu,Shaofeng Xie,and Qunzhan Li,Single-Phase Back-To-Back Converter for active Power Balancing,Reactive Power Compensation,and Harmonic Filtering in Traction Power System[J].Power Electronics,IEEE Traction on vol.26, pp.334-343,2011.
[14]魏光,李群湛,黄军等.新型同相牵引供电系统方案[J].电力系统自动化,2008,32(10)：80-83.
[15]陈民武,牵引供电系统优化设计与决策评估研究[D].西南交通大学博士学位论文.2009.
[16]AraiK.Balanelng Circuit for Single Phase Load with Scalene Scott Connection Transform er[J]. Rail way Technical Research Institute Quarterly Report.1981, (1).
[17]李群湛,贺建闽,电气化铁路的同相供电系统与对称补偿技术[J].电力系统自动化,1996,20(4)：9-11.
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