Research On Control System Of Multi-winding Permanent Magnet Synchronous Motor For Solar UAV

Currently,solar-powered UAV are attracting much attention due to their strategic value and development prospects,but the large-scale wings of solar-powerd UAV suffer from the problems of different power generation capacity of photovoltaic panels at different locations and unbalanced energy supply modules.At the same time,the energy management system usually adopts a centralized DC bus structure,with the DC bus voltage fixed,resulting in inconsistent energy absorption by each part and reduced overall power generation efficiency.Based on this,relevant scholars have proposed a new distributed energy management system,which has multiple independent variable DC buses,each with a different voltage level,so that the energy absorbed by each part of the PV panel is adapted to the corresponding DC bus voltage level,ensuring that each part is working at the maximum power point and improving energy utilization radio.The propulsion system of a long-range solar-powered UAV with a distributed energy management system usually consists of multiple small propulsion motors distributed symmetrically from left to right.When the propulsion motors on the left and right wings do not obtain the same amount of energy,this results in an imbalance in thrust between the two wings,which seriously affects the flight attitude.In order to achieve a balanced thrust between the two wings,it is inevitable that the high energy side is forced to maintain consistency with the low energy side,reducing the energy utilization.Therefore,this paper proposes a new multi-winding permanent magnet synchronous motor control system suitable for distributed energy management systems.The system is divided into several motor modules,each consisting of a single set of windings supplemented by a corresponding drive,and the different motor modules can work either independently or in concert.However,the output torque of this motor control system must always be consistent between the different windings,which requires the current phases of the different windings to be synchronized to meet the magneto-dynamic potential consistency principle,which is the key issue addressed in this paper.This article first analyzes the structure of the multi-winding permanent magnet synchronous motor,and builds the corresponding mathematical model in different coordinate systems.At the same time,a magnetic circuit calculation is carried out to determine the basic parameters of the motor,and then a finite element model is constructed and simulated to prove the rationality of the motor’s parameter design.Secondly,based on the study of vector control algorithms for single motor modules,a closed-loop control algorithm for multi-motor modules is proposed.In order to achieve phase synchronization of the current between different windings,three control strategies,PI,PR and quasi-PR,are analyzed in focus,and proposed the reference current to use the quasi-PR control strategy to complete the tracking without static error.In other words,one motor module was vector-controlled to obtain a set of reference current phases,and the rest of the motor modules are tracked by the quasi-PR control strategy for the reference current phases.Matlab/Simulink simulations are used to verify that the reference current can be tracked without static error by using the quasi PR control strategy.The simulation results also show that the motor has a good dynamic performance and validate that the multi-motor module can work independently or in coordination.Finally,build an experimental platform.The experimental results show that the winding currents of each motor module can ensure phase synchronization,and that each motor module is able to adjust its power according to the changes in the issued commands,thus verifying the feasibility of the multi-winding permanent magnet synchronous motor control system suitable for the distributed energy management system of solar-powered UAV.