| Direct-Current(DC)High-voltage(HV)contactor,with the advantages of high reliability and long operating life,is capable of handling high power process,and thus widely used in several different high voltage and high current conditions,such as medical equipment,electric vehicles,battery recovery and uninterrupted power system.But the traditional DC drive coil is severely heated due to power consumption,which directly influences the promotion and application of DC HV contactor,the supporting energy-saving driving circuit is needed to improve the power consumption performance.In this paper,the remaining energy-saving driving circuits are categorized into 3types.Among the 3 types of circuits,the driving circuit which its drive coil and retaining coil asynchronously supply power,must contain two coils,and is of simple structure,low cost,and inherits the disadvantages of occupying auxiliary contact and low reliability.As for voltage switching type driving circuit,it is of simple structure and high control precise,but also faces the issue of larger volume and higher cost.The last type-the PWM driving circuit,represents the development trend of the future energy-saving driving circuit,and is more intelligent and powerful.In the paper,a PWM control type circuit for a contactor is designed and physically tested.The results indicate that the coil current significantly declines at contactor retaining period and purpose of energy saving is achieved.The key issue in the simulation and modeling of electromagnetic appliances is finding the solution of the electromagnetic field.So far,the commercial finite element software is usually used to solve the issue,but the software is not capable of complex circuit modeling.In order to meet the demands of real time simulation of large scale,hybrid electrical system,conducting circuit calculation and finding the solution of appliances electromagnetic field at the same time is essential and becomes a research field of great prospects.In the paper,an energy-saving driving circuit is modeled through electrical and electronic analysis software PSIM,and simulated.The dynamic and steady characteristics of contactor are simulated through infinite element analysis software Flux,and finally the dynamic joint simulation is achieved through Matlab/Simulink platform.Based on the platform,the dynamic characteristics of contactor with energy-saving driving circuit are simulated and analyzed,and the dynamic characteristics of different energy-saving driving circuit is compared and analyzed.Since the infinite element solving process takes quite a long time when ensuring the proper solution accuracy,the time consumption mainly relies on the speed of device-level taking up relatively more simulation time,namely the devicelevel simulation speed.Thus,in order to improve the solving speed of the key simulation,the simulation of contactor itself must speed up.In the paper,a radial basis function neural network together with the data sampling points offered by infinite element model is used to establish an approximate model to achieve the goal of fast calculation and simulation.Besides,the method is also applied in the field-circuit integrated simulation,and that makes the integrated simulation much faster.Compared with the results of the infinite element method,the relative error is within 2% which meets the demand of calculation accuracy.As for the simulation speed,the joint simulation with radial basis function neural network approximate model only takes 5s while the infinite element one take 5h.Through using this approach,the field-circuit integrated simulation is greatly sped up,and the paper finally achieves the goal of simulation speed optimization. |
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