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为解决电气化铁路牵引供电系统中三相网侧谐波、无功和负序等电能质量问题,同时满足电气化铁路补偿容量大的要求,提出了采用并联型铁路功率调节器(railway static power conditioner,RPC)配合降压变压器的综合补偿方案,具体研究了并联型RPC的控制策略并进行了仿真分析。提出了对RPC的指令电流检测采用平衡补偿电流检测法,对RPC的补偿电流控制采用基于比例谐振(proportion resonance,PR)控制器的三角波比较控制方式,同时将载波相移(carrier phase shift,CPS)技术应用于RPC的控制。最后,利用MATLAB/Simulink搭建了由2个RPC并联构成的补偿方案的仿真模型。仿真结果表明:RPC投入运行后,三相网侧电流为与电网电压同相位的三相正弦对称电流,只含有开关频率整数倍次的高次谐波;通过进一步采用CPS技术,开关频率奇数倍次的高次谐波被有效滤除,三相网侧电流总谐波畸变率由8.04%降低为2.24%。仿真结果验证了并联型RPC在解决牵引供电系统中三相网侧电流谐波、无功和负序等电能质量问题方面的可行性与优越性,为并联型RPC的工程应用提供了有价值的参考。
In order to solve the power quality problems of harmonic, reactive power and negative sequence on the three-phase network side of the electrified railway traction power supply system and satisfy the requirement of large compensation capacity for electrified railway at the same time, a new method of adopting railway static power conditioner RPC) with the comprehensive compensation scheme of step-down transformer, the control strategy of parallel RPC is studied in detail and the simulation analysis is carried out. The counter current detection method based on balanced compensation is proposed for the instruction current detection of RPC. Triangular wave comparison control method based on proportion resonance (PR) controller is used to control the compensation current of RPC. Meanwhile, the carrier phase shift (CPS Technology is used in RPC control. Finally, using MATLAB / Simulink to build a simulation model consisting of two RPC parallel compensation scheme. The simulation results show that: after the RPC is put into operation, the three-phase network side current is the three-phase sinusoidal symmetrical current with the same phase with the grid voltage, only contains the higher order harmonics with the integral multiple of the switching frequency; by further adopting CPS technology, the switching frequency is odd times The second harmonic is effectively filtered out, and the total harmonic distortion of the three-phase line current is reduced from 8.04% to 2.24%. The simulation results verify the feasibility and superiority of parallel RPC in solving the power quality problems of three phase network side current harmonics, reactive power and negative sequence in traction power supply system, and provide a valuable reference.