Research Of Beam-Pumping Units Timing Control System Saving Energy Method

Beam-Pumping Units control system measure and control the working condition of the oil-pumping units for the saving energy objections. The paper includes: pumping units' working principle, analysis of saving energy method in our country, putting forward the saving energy scheme, designing the hardware and software of cycloconverter and emulating the whole control system.First of all the paper discusses the background of the issue, signification of the research and the aim and process. Then this paper analysises the pumping units' working process and existed problem, it introduces common saving energy method and compares of the shortcoming and advantage of these. according to analysis, we sum up that there are 3 main problems: the problem of life of pumping unit saving energy system; the problem of pumping unit reverse generating electricity; the problem induced by interval pump frequently start-stop.Now pumping units timing saving energy control machine mainly adopts AC-DC-AC inverter, it has a fatal shortcoming, this inverter can't run for a long time. Besides, pumping units existed inverse generating electricity problem. On the basis of these two problems, it puts forward the saving energy scheme that is cycloconverter control system. This paper adopts embedded system op7200 as a control core, introduces the design of hardware and software of cycloconverter.Besides, interval pumping expenses is high, system reliability is low. this paper adopts " relation between pump filling degree and output power "method. it adjusts frequency of stroke according to power, reduces the time of start-stop, increases system reliability, at last the paper makes a simulation of whole control loop that adopts this working mode. the result of simulation shows that this control mode fits the control of motor, its response is good, it can tail after the load moment and has good stability and anti-jamming quality.