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大功率交流机车的辅助变流器系统研究
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摘要
中国铁路第六次大提速,国家加速了新型大功率交流机车国产化的步伐。辅助变流器的工作状况直接影响到机车的工作状态,以及司乘人员的工作环境,是机车稳定、安全运行的关键,而辅助变流器的检修是其前提。DJ1型机车是国产新型大功率交流机车的第一款,论文为其设计了辅助变流器能流循环试验台,利用“能流循环”的原理,将系统中的电能循环利用,大大的节约了电能资源,充分响应了国家关于社会节能、生产节能的号召。
     本文首先对新型交流机车的辅助变流器最新发展动态进行介绍,重点对国产的重载机车DJ1、HXD系列、SS4改辅助变流系统的电路结构与工作原理进行阐述。
     在8K机车辅变能流循环试验台开发经验基础上,论文对新型的DJ1辅助变流器系统能流循环试验台的设计方案进行详细分析比较,并最终决定利用模拟负载,通过将其输出电能回馈到电网的途径,实现大功率输出与能流循环的目标。
     论文重点首先从结构和操作上整体介绍试验台模拟负载(三相PWM整流器、单相并网逆变器)的主电路硬件结构;DJ1辅变实际运行与离车运行的工作情况以及MVB通信原理;试验台实际工作的操作与原理。
     另外从系统与局部细节角度,文章对试验台的控制系统尤其是DSP控制系统箱的优越性与内部电路进行详细介绍,然后再为模拟负载两个功率单元分别设计了同步PI控制与预测电流控制算法,最后给出实际实验波形,充分验证算法的正确性与系统能流回馈及大功率输出的可行性。
With the beginning of the sixth "speed boost" of Chinese railways, China has largely developed its domestic manufacturing on new high power AC electric locomotive, in which DJ1 is the first style. For decreasing the running cost of testing system, increasing efficiency, lightening work strength, this paper designs an off-locomotive "power-looping testing device" for DJ1 auxiliary converter. It can save electric power in a considerable degree which is full fill summon of saving energy by our country.
     The paper introduces the developing trends of auxiliary converter on new AC electric locomotive, especially to the domestic production DJ1, HXD series, SS4G with the circuit structure and working theory.
     Based on the developing experience of power-looping testing system for 8K electric locomotive auxiliary power, some new programs for DJ1 auxiliary converter are compared. The final one picked is to feedback its output electric power to electric grid using simulating load to make high power output and power loop.
     The paper introduces the simulating load from the structure and operation globally, including main circuit, working condition and MVB communication of DJ1 auxiliary converter, operation and theory actually of testing system.
     Also control system is introduced from system and detail degree, especially to the DSP control system box and circuit inside. We design synchronous PI control and predict current control for the two power units of simulating load. Experiment waves are given to prove this design's well performance.
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