摘 要摘 要在原油管道输油系统中，形成输油泵与管线之间压差大的直接原因是运行的输量远小于设计输量。而在工况的运行不同时候，电机的转速恒定，势必会造成此工况下输油泵机组的能耗增大，利用率降低。又因原油输送特殊工况，仅通过不断更新外输泵机组，不能实现两者间的最优特性匹配。提出利用高压变频器对中石化管道储运系统鲁宁线的三个站场内的动力设施变速调速方式控制，通过变换频率来改变电机的转速，达到节能、使能耗降低的目标，研究站场内动力设施采用变频方式前、后泵使用效率的变化。通过对变频调速原理的分析研究，提出以压力信号比对的方式，通过采集在用管道的压力数据，先与设定压力数据进行比较，再根据比较结果，调节相应的输油泵机组工况。针对原油输送的不停输特殊性，利用高压变频设备具有工/变频的自动转换功能。采取了开环控制、保护参数自动优选、多电平电压源串联、多功率单元结构的变频器方案，该方案优点为谐波污染小、效率高、电网功率因数高、旁路保护等。在六合、滕州、睢宁等输油站，分别进行了单泵、双泵并联以及三泵并联三种工作模式下的试验，对比了变频调速前后泵机组能耗的差异，来评价该方案的有效性结果表明，在原油管道输油系统中，采用变频调速改造后，综合工况节电约 40%。关键词：输油泵；变频；调速；节能ABSTRACTResearch on Application of Frequency Converter in Electrical Machine of Station along Oil PipelineABSTRACTDue to the design throughput is much higher than operation throughput in the oil transportation system, the increase of pressure difference between pump and pipe occurs frequently. As the rotational speed of motor are not able to adjust under variable working conditions, because of the special status of the oil transportation system, it is impossible to accthe utilization efficient of oil pump units is low and the energy consumption is high. Howeveromplish the performance characteristic matching between pump and pipe simply by replacing the efflux pump or corresponding electromotor. For regulating the oil pump units speed in the three stations of Luning pipeline of SINOPEC pipeline...
