摘要
随着新能源大规模接入电力系统,高速铁路牵引供电系统在运行中面临三相电流不平衡、负序电流增加以及电能质量下降等问题。为解决传统全补偿模式下铁路功率调节器(MRPC)容量受限导致的新能源接入受阻与电能质量恶化的矛盾,文章提出一种面向新能源接入的优化补偿控制策略。首先对新能源接入V/v牵引供电系统的功率流动特性及MRPC全补偿机理进行分析,明确了不同机车组合工况下MRPC容量约束对新能源消纳能力的影响;然后在此基础上,构建以新能源接入电流限制量ΔI与三相负序电流I-为目标的优化补偿数学模型,将两相桥臂转移有功电流、两相牵引供电臂机车功率因数角及三相电流不平衡度作为关键决策变量,并引入多目标遗传算法NSGA-Ⅱ进行求解;最后通过半实物仿真试验验证了所提策略的有效性。结果表明,即使在最大不平衡工况下接入50 kW新能源,该方法仍能显著提升电能质量,将负序电流由37.5 A抑制至14.4 A。相比传统全补偿策略,优化补偿不仅能够更大程度消纳新能源,还能在MRPC容量受限的条件下保持系统的安全性和可靠性。研究创新性地将传统的全补偿范式转化为多目标优化补偿范式,揭示了新能源接入与电能质量改善之间的权衡关系,为新能源消纳与铁路电气化供电系统的协调运行提供了一种切实可行的新思路。
With the large-scale integration of renewable energy into power systems,high-speed railway traction power supply systems face increasing challenges,including three-phase current imbalance,higher negative-sequence current,and deterioration of power quality.To address the conflict between the limited capacity of the multi-port railway power conditioner(MRPC)in traditional full compensation mode and the simultaneous demand for integrating renewable energy and power quality improvement,this paper proposes an optimization compensation control strategy for integrating renewable energy.First,this study analyzed the power flow characteristics of the V/v traction power supply system with renewable energy integrated,along with the full compensation principle of MRPC.The influence of MPRC capacity constraints on the absorptive capacity of renewable energy under different locomotive operation combination conditions was determined.Building on this analysis,an optimization compensation mathematical model was developed with two objectives:current limit for integrating the renewable energy(DI)and the three-phase negative-sequence current(I⁻).The model included key decision-making variables such as active current transfer between two-phase bridge arms,the locomotive power factor angle of the twophase traction supply arms,and the three-phase current imbalance.The model was solved using the multi-objective genetic algorithm NSGA-Ⅱ,and the effectiveness of the proposed strategy was validated through hardware-in-the-loop experiments.Results show that even under the most imbalanced condition with 50 kW of renewable energy integrated,the negative-sequence current can be reduced from 37.5 A to 14.4 A,significantly improving system stability and power quality.Compared to the traditional full compensation approach,the proposed optimization method not only facilitates greater absorption of renewable energy but also ensures safe and reliable system operation within the constraints of limited MRPC capacity.This study innovatively transformed the paradigm from"full compensation"to"optimization compensation",revealing the trade-off between renewable energy integration and power quality enhancement,while providing a feasible solution for the absorption of renewable energy and coordinated operation of electrified railway power supply systems.
作者
李国俭
徐进
吴学刚
邱勇
杨汶坡
李新雨
LI Guojian;XU Jin;WU Xuegang;QIU Yong;YANG Wenpo;LI Xinyu(Inner Mongolia Chahar New Energy Co.,Ltd.,Ulanqab,Inner Mongolia 012000,China;XYZ Storage Energy Development(Beijing)Co.,Ltd.,Beijing 102400,China;College of Electrical and Information Engineering,Hunan University,Changsha,Hunan 410082,China)
出处
《机车电传动》
2025年第3期65-73,共9页
Electric Drive for Locomotives
基金
湖南省科技创新计划项目(2024JK2105)。
关键词
多端口铁路功率调节器(MRPC)
新能源接入
负序电流抑制
多目标优化
NSGA-Ⅱ
电能质量
高速铁路
multi-port railway power conditioner(MRPC)
renewable energy integration
negative-sequence current suppression
multi-objective optimization
NSGA-Ⅱ
power quality
high-speed railway
