【作者】 郝亮；

【导师】 赵文祥；

【作者基本信息】 江苏大学 ， 电气工程， 2022， 硕士

【摘要】 双三相永磁同步发电机(dual three-phase permanent magnet synchronous generator,DTPPMSG)凭借强容错能力、低压大功率等优势,在先进装备的直流发电领域发挥重要的应用价值。但是直流母线电压在负载瞬态变化时深受电压响应慢、振幅大等问题困扰,且母线电流传感器易故障损坏,严重影响系统可靠运行。为了增强抗负载扰动能力,本文提出交轴电流直接计算和电容储能比例积分(proportional integral,PI)控制相结合的外环控制方法。通过分析整流系统数学模型推导出交轴电流的计算公式,设计电容储能PI控制器应对电容电压和交轴电流的非线性,补偿建模中难以计算的损耗所引起的交轴电流计算误差。为了提高母线电流监测的可靠性,提出无母线电流传感器的稳压控制方法,在DTP-PMSG的空间矢量脉宽调制(space vector pulse width modulation,SVPWM)下建立相电流与母线电流数学方程,重构出母线电流并将其前馈进电压外环,实现母线电流监测的同时又提升电压控制效果。本文从理论分析、数学建模及仿真实验等多面验证了所提方法的有效性,主要研究内容如下:1.简要分析了双三相电机的拓扑结构和电气特性,参考多相电机矢量解耦方法,建立DTPPMSG多子空间解耦模型。结合整流器特征推导直流母线功率交换模型,阐述最大四矢量SVPWM和矢量控制,奠定交轴电流计算和无母线电流传感器稳压控制的理论基础。2.阐述传统PI控制方法中电压和电流双环控制的设计实现过程,并以此为基础研究交轴电流计算方法,通过对直流负载扰动的系统传递函数分析,验证交轴电流计算方法的可行性,并对两种方法搭建仿真模型,对比仿真结果验证所提方法具有较好的控制性能。3.针对复杂工况下直流母线电流传感器易故障的问题,提出无母线电流传感器稳压控制方法,根据最大四矢量SVPWM原理,采样电机电流重构出母线电流,并进行优化。设计以电容储能PI控制和母线电流前馈的方式进行电压控制,并搭建模型进行仿真验证。4.搭建了以双三相整流器拓扑结构为基础的软硬件实验系统,并对整流器关键的硬件电路和面向电机控制的核心软件进行介绍。以DTP-PMSG为控制对象,将本文所提的两种控制策略与分析的传统PI控制方法进行对比实验验证。更多还原

【Abstract】 Dual three-phase permanent magnet synchronous generator(DTP-PMSG)plays an important role in the direct current(DC)power generation system in the field of advanced equipment by virtue of its advantages,such as strong fault tolerance,low voltage and high power.However,the DC bus voltage is plagued by problems such as slow voltage response and large amplitude during load transient changes.The bus current sensor is prone to failure and damage,which seriously affects the reliable operation of the system.In order to enhance the anti-load disturbance capability,an outer loop control strategy combining quadrature-axis current calculation and capacitor energy storage proportional integral(PI)control is proposed in this paper.By analyzing the mathematical model of the rectifier system,the calculation formula of the quadrature-axis current is deduced,and the capacitor energy storage PI controller is designed to deal with the nonlinearity of the capacitor voltage and quadrature axis current,and compensate the quadrature axis current calculation error caused by the loss that is difficult to calculate in the modeling.In order to improve the reliability of bus current monitoring,a bus current sensorless voltage regulation control method is proposed,and the mathematical equations of phase current and bus current under the space vector pulse width modulation(SVPWM)of DTP-PMSG is established.The bus current is reconstructed and fed forward into the outer voltage loop to realize the bus current monitoring and improve the voltage control effect.In this paper,the effectiveness of the proposed method is verified from theoretical analysis,mathematical model and simulation experiments.The main research contents are as follows:1.The topological structure and electrical characteristics of the dual-phase motor are analyzed briefly,and the DTP-PMSG multi-subspace decoupling model is established by referring to the vector decoupling method of the multiphase motor.Combined with the characteristics of the rectifier,the DC bus power exchange model is deduced,the maximum four vector SVPWM and vector control are described,which lay the theoretical foundation of quadrature-axis current calculation and voltage stabilization control without bus current sensor.2.On this basis of design process for traditional PI control method of voltage and current double loop control,the quadrature axis current calculation method is studied.Through the analysis of the system transfer function to DC load disturbance,the feasibility of the quadrature axis current calculation method is verified.Meanwhile,simulation models are built for the two methods,and the simulation results are compared to verify that the proposed method has better control performance.3.To solve the problem that the DC bus current sensor is prone to failure under complex working conditions,a voltage stabilizing control method without bus current sensor is proposed.According to the principle of maximum four vector SVPWM,the bus current is reconstructed by sampling motor current and then optimized.Capacitor energy storage PI control and bus current feedforward are designed to control the voltage,and a corresponding model is built for simulation verification.4.The hardware and software experiment system based on the topology of dual-three-phase rectifier is built,and the key hardware circuit of rectifier and the core software for motor control are introduced.Taking DTP-PMSG as the control object,the two control strategies proposed in this paper are compared with the traditional PI control method.更多还原