共查询到18条相似文献,搜索用时 125 毫秒
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通过对重载铁路牵引供电系统存在的电分相、谐波、负序及再生制动四个主要技术问题进行分析,给出了切实可行的解决方案,希望能为重载铁路事业的进一步发展提供一定的参考. 相似文献
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电气化铁路以牵引负载为主,这种负载基于大量电力电子器件工作,其运行会给供电网带来谐波超标、负序越限、低功率因数等问题,严重影响周边用户的用电权益。文章基于国家权威部门对京沪线电能质量测试结果,就电气化铁路负载对电网电能质量的副作用进行解析,同时从优化牵引技术、引入并联补偿技术等层面提出针对性解决方法,以期为推进铁路电气化而抛砖引玉。 相似文献
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本文以哈大高铁西四牵引供电区段及CRH380BG型动车组车网耦合为研究对象,分析牵引网高低次谐波产生机理,建立了车网耦合系统的数学模型,对动车组不同位置不同工况谐波电流进行仿真分析。针对牵引供电区段谐波电流特性,提出基于阻波高通滤波器的抑制策略,对满功率动车组不同工况谐波电流抑制方案验证,为哈大高铁西四牵引供电区段谐波抑制问题提供了理论参考依据。 相似文献
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本文以SS4G型电力机车为例,建立SS4G型电力机车在直供式牵引供电系统中的数学模型;并对电力机车牵引工况主电路采用的不等分四段桥式整流电路进行分析;然后对可能产生谐波最多的SS4G型电力机车在第一段整流桥工作在牵引状态时进行了仿真分析,得出机车在此状态下的谐波电流分布特性;最后利用电能质量测试仪器U902对第一段整流桥工作在牵引状态时的谐波电流进行了现场测试,测试数据表明与仿真结果基本吻合,证明了论文的分析和仿真结果正确合理。 相似文献
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随着电气化铁路系统的迅速发展,大量煤矿电网都与电铁牵引供电系统共网运行,由于电铁牵引负荷产生负序电流注入电网,其对煤矿电网的电能质量造成很大影响,影响煤矿电网的安全运行。本文结合山西某煤矿实际电网运行情况,测试、分析了与电气化铁路系统共网运行的煤矿电网负序电流特点,同时分析了现有有源负序治理方法的优缺点,并选取合适的算法集成于有源治理设备MARS中进行煤矿电网负序电流治理。最后利用仿真软件PSCAD/EMTDC进行仿真分析,验证其是有效可行的。 相似文献
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确保车辆牵引供电系统持续供电,才能保证高速动车组的正常运行.基于这种认识,本文对高速动车组车辆牵引供电系统的继电器保护配置问题展开了分析,结合不同供电方式对牵引网和变压器的继电保护方法进行了探讨,以便为关注这一话题的人们提供参考. 相似文献
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城市轨道交通机车制动时产生的制动能量,除一部分被正在取流的机车利用外,剩余的则会导致直流牵引网压升高。现阶段,由于普遍采用的是电阻制动,剩余的能量全部由电阻消耗,这样不仅造成了再生制动能量的利用率低,还会增加散热通风系统的负担。本文分析了将PWM变流器应用于城市轨道交通再生制动能量吸收,建立了系统数学模型,并在Matlab/Simulink环境下搭建了系统仿真模型。仿真结果验证了方案的可行性,并且具有功率因素较高、系统动态响应快和直流侧电压稳定性好等特点。 相似文献
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A new two-quadrant (2Q) zero-current-transition (ZCT) converter with the capabilities of 2Q power flow and ZCT switching profile for DC motor drives is presented. It possesses the advantages that both the main and auxiliary switches can operate with zero-current switching (ZCS), reduced switching losses and stresses, minimum voltage and current stresses as well as minimum circulating energy during both the motoring and regenerating modes. It also offers simple circuit topology, minimum component count and low cost. This converter is particularly useful for DC traction systems in which both motoring and regenerative braking are desired to have high efficiency. The corresponding theoretical analysis and its high-efficiency performance are supported by both simulation and experimental results. 相似文献
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Chunting Mi Hui Lin Yi Zhang 《Vehicular Technology, IEEE Transactions on》2005,54(2):486-494
Hybrid electric vehicles (HEVs) use multiple sources of power for propulsion which provides great ease and flexibility to achieve advanced controllability and additional driving performance. In this paper, the electric motor in HEV and electric vehicle (EV) propulsion systems is used to achieve antilock braking performance without a conventional antilock braking system (ABS). The paper illustrates that the antilock braking of HEV can be easily achieved using iterative learning control for various road conditions. A vehicle model, a slip ratio model, and a vehicle speed observer were developed to control the antilock performance of HEV during braking. Through iterative learning process, the motor torque is optimized to keep the tire slip ratio corresponding to the peak traction coefficient during braking. Simulations were performed on a compact size vehicle to validate the proposed control method. The control algorithm proposed in this paper may also be used for the ABS control of conventional vehicles. 相似文献
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《Power Electronics, IEEE Transactions on》2008,23(5):2230-2236
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This paper describes a novel regenerative braking control scheme of electric power-assisted wheelchairs for safety driving on downhill roads. The ldquoelectric power-assisted wheelchairrdquo which assists the driving force by electric motors is expected to be widely used as a mobility support system for elderly people and disabled people; however, it has no braking system to suppress the wheelchair's velocity and brings the dangerous and fearful driving particularly on downhill roads. Therefore, this paper proposes a novel safety and efficient driving control scheme based on the regenerative braking system. This paper applies the regenerative braking system with the step-up chopper circuit serially connecting two motors and realizes the velocity feedback control with the variable duty ratio so that it tracks the optimal velocity based on the minimum Jerk model. In addition, the dynamic braking system is also applied at the low-speed range instead of the regenerative braking in order to suppress the acceleration. Some driving experiments on the practical downhill roads show the effectiveness of the proposed control system. 相似文献
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Vehicle Stability Enhancement of Four-Wheel-Drive Hybrid Electric Vehicle Using Rear Motor Control 总被引:4,自引:0,他引:4
Donghyun Kim Sungho Hwang Hyunsoo Kim 《Vehicular Technology, IEEE Transactions on》2008,57(2):727-735
A vehicle stability enhancement control algorithm for a four-wheel-drive hybrid electric vehicle (HEV) is proposed using rear motor driving, regenerative braking control, and electrohydraulic brake (EHB) control. A fuzzy-rule-based control algorithm is proposed, which generates the direct yaw moment to compensate for the errors of the sideslip angle and yaw rate. Performance of the vehicle stability control algorithm is evaluated using ADAMS and MATLAB Simulink cosimulations. HEV chassis elements such as the tires, suspension system, and steering system are modeled to describe the vehicle's dynamic behavior in more detail using ADAMS, whereas HEV power train elements such as the engine, motor, battery, and transmission are modeled using MATLAB Simulink with the control algorithm. It is found from the simulation results that the driving and regenerative braking at the rear motor is able to provide improved stability. In addition, better performance can be achieved by applying the driving and regenerative braking control, as well as EHB control. 相似文献