| Military Mobile Power Station(MMPS)is the main source of energy for military weapons and logistics protection under field conditions,it is also an important guarantee to win the modern war.The main components of the system are as,follows:power generation device part,the main power circuit part,the control system part,carrying part.At present,a large number of troops equipped with the MMPS power generation device is a diesel generator sets,because there is an inevitable disturbance problem in the engine fuel supply system,it's output voltage amplitude and frequency instability is difficult to ensure that the weapons system and logistical support for electricity quality requirements.At the same time,in order to make the performance,capacity,reliability,safety and scalability of the MMPS power supply system meet the requirements of various modern weapons and logistics requirements,it is necessary to provide two or more power stations to provide any energy Capacity of the redundant power supply system,that is,to build "tactical microgrid",and the core technology of using the MMPS to form the "tactical microgrid" is PMSG with inverter parallel control technology.Therefore,this paper mainly focuses on the analysis and research of PMSG inverter design and inverter parallel control technology.First of all,in order to make the output of PMSG three-phase AC voltage and frequency constant and can meet the electricity requirements,and to provide electricity and improve the single-phase load with unbalanced load capacity,in this paper,the topology of the AC-DC-DC-AC converter is designed for the PMSG inverter system,which is a three-phase bridge uncontrolled rectifier circuit,dual-boost circuit and three-phase bridge inverter circuit,and the mathematical model is deduced for the key components of PMSG in the topology of the inverter system.In order to overcome the problem of the bus voltage drop when the load is abrupt,the compound control strategy of the disturbance compensation of the inverter output current is put forward,the response speed of the system is improved and the output voltage waveform of the Boost booster circuit is improved.And also,a closed-loop control strategy for voltage and current decoupling is designed for three-phase inverter.On the basis of theoretical research,the feasibility and correctness of PMSG inverter system control strategy are verified by simulation with the use of MATLAB/Simulink software.Secondly,on the basis of the theoretical analysis of the traditional droop control method,in order to realize the power sharing,circulating current suppression and improve the dynamic response of the system,an improved inverter parallel droop control method is proposed.The content is:it is impossible to accurately measure the common node voltage after the equivalent line impedance for the traditional droop method,the improved power calculation formula is deduced by using the output voltage of the inverter,and the control precision of the inverter system with PMSG is improved.Aiming at the reactive power circulation caused by different impedance of different voltage levels in PMSG parallel system,the compensation of line voltage drop is designed and the current sharing performance of inverter parallel system is improved.In order to solve the dynamic response of the parallel system by using the low-pass filter,the integral link and the differential link are added on the basis of the traditional droop method,which accelerates the dynamic response of the system and eliminates the static error.The simulation results show that the improved droop control method can realize the power equalization and circulation suppression of the inverter,and improve the response speed of the system.Finally,the hardware platform of PMSG inverter system is designed based on TI's DSP,model TMS320F28335 as the center controller and CREE's MOSFET,moddel C2M0280120D SiC as the power device.The experimental results show that the PMSG inverter system designed in this paper can meet the main technical requirements and achieve the intended purpose,to further verify the rationality and feasibility of the design. |
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