In order to solve the abnormal power picking of the electric locomotive caused by the voltage drop of the haulage network for the special heavy load coal transportation line, an analysis was conducted on the voltage transmission and lost process. The voltage lost mainly was to compensate the reactive current for the voltage lost in the system and the voltage lost in the haulage network. Thus a dynamic reaction compensation device set in the substation was provided. A proper injection of reactive power was applied to stabilize the voltage of the haulage network. Taking the Yinta substation as an example, a 55 kV wall-hooked static reactive generator consisted with 42 pairs of thyristor components was researched and developed and a control tactics with feed forward open loop and local feedback closed-loop was provided to improve the response speed and steady state accuracy of the transition process.The results showed that after the dynamic reactive compensation device put in application, the average voltage value of the haulage network was increased from 46.39 kV to 54.40 kV and the voltage drop of the haulage network was reduced by 52.5%. Meanwhile, the power factor was improved from previous 0.76 to 0.98 and the utilization rate of the power supply system was effectively improved.%为解决重载运煤专线的牵引网电压跌落，导致电机车无法正常取电的问题，对电压的传递及其损失过程进行分析，可知电压损失主要为补偿无功电流在系统中的电压损失和牵引网的电压损失，基于此，提出了在变电所安装动态无功补偿装置，通过适当调整无功功率来稳定牵引网电压的技术。以阴塔变电所为例，研制了由42对晶闸管组件组成的55 kV直挂式静止无功发生器，并采用了前馈开环和局部反馈闭环的控制策略来提高调压过渡过程的响应速度和稳态精度。结果表明：动态无功补偿装置投入后牵引网电压的平均值由原来的46.39 kV提高到54.40 kV，牵引网电压跌幅降低了52.5％；同时功率因数由原来的0.76提高到0.98，有效提高了供电系统的利用率。
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