双PWM变换器协调控制策略及工作性能研究

发布时间：2018-12-25 14:24

【摘要】：因网侧电流正弦化、功率因数可调以及能量双向流动等优势，双PWM变换器在电力特别是在永磁同步电机（PMSM）调速领域中，有着广阔的发展前景和研究价值。本课题主要研究内容及创新点如下： 1）根据瞬时无功功率理论，在两相静止坐标系下建立双PWM变换器网侧整流器离散化数学模型。在此基础上提出一种瞬时功率预测电流控制（IP-PCC）算法，改善传统PCC算法存在的稳态误差问题，并降低对结构参数变化的敏感程度。设定瞬时无功功率指令值为零以满足系统单位功率因数运行要求。据单个采样周期内瞬时功率跟踪误差平方和设定价值函数。通过满足固定时间周期内价值函数最小为原则，预测下一采样时刻电网电流分量。同时，将虚拟磁链变量引入IP-PCC算法，针对纯积分运算存在的积分初值和直流偏置问题，提出一种带有补偿量的改进型一阶低通滤波器（FOLP）进行虚拟磁链估计,以期实现PWM整流器IP-PCC无电压传感器控制。 2）根据静止坐标系以及以转子磁链和定子磁链为基准的两种旋转坐标系下各变量关系，借助矢量控制解耦思想，利用定子电流及定子磁链分量建立逆变器瞬时功率数学模型，从而提出双PWM变换器电机侧逆变器瞬时功率预测控制（PIPC）算法，提高系统功率因数。以PMSM定子磁链幅值恒定为原则计算瞬时有功功率指令值，，并根据功率跟踪误差选择逆变器期望开关电压。推导PMSM调速系统能观性条件，并将离散滑模观测器（D-SMO）及高频旋转电压信号注入法分别引入PIPC算法中，以期实现全速度范围内逆变器PIPC无位置传感器控制。 3）针对双PWM变换器功率流动情况，根据PIPC算法结构，将PIPC算法中瞬时有功功率预测值直接作为双PWM变换器负载功率变量，采用负载功率前馈控制实现PWM整流器IP-PCC结构和PWM逆变器PIPC算法的协调。无需单独进行负载功率观测，以期实现双PWM变换器协调控制。在理论和仿真分析基础上，搭建双PWM变换器电机调速系统实验平台。从软硬件两方面设计网侧PWM整流器IP-PCC实验、电机侧PWM逆变器PIPC实验以及双PWM变换器负载功率前馈协调控制实验，并进行在线调试，验证所提相关理论有效性和可行性。
[Abstract]:Due to the advantages of sinusoidal current, adjustable power factor and bidirectional energy flow, double PWM converters have a broad prospect and research value in power, especially in the field of permanent magnet synchronous motor (PMSM) (PMSM) speed regulation. The main contents and innovations of this paper are as follows: 1) based on the instantaneous reactive power theory, a discretization mathematical model of grid-side rectifier of double PWM converter is established in two-phase stationary coordinate system. On this basis, a transient power predictive current control (IP-PCC) algorithm is proposed to improve the steady-state error of the traditional PCC algorithm and reduce the sensitivity to structural parameters. The instantaneous reactive power instruction value is set to zero to meet the operational requirement of unit power factor of the system. According to the sum of the square of instantaneous power tracking error in a single sampling period, the value function is set. By satisfying the principle of minimum value function in a fixed time period, the current component of the power network at the next sampling time is predicted. At the same time, the virtual flux variable is introduced into IP-PCC algorithm. Aiming at the problem of integral initial value and DC bias in pure integral operation, an improved first-order low-pass filter (FOLP) with compensation is proposed to estimate the virtual flux. In order to achieve PWM rectifier IP-PCC voltage sensorless control. 2) according to the relations of variables in static coordinate system and two kinds of rotating coordinate system based on rotor flux and stator flux, the instantaneous power mathematical model of inverter is established by using stator current and stator flux component with vector control decoupling idea. In order to improve the power factor of the system, the (PIPC) algorithm of instantaneous power predictive control for the motor side inverter of dual PWM converter is proposed. The instantaneous active power instruction value is calculated on the principle of constant amplitude of PMSM stator flux, and the expected switching voltage of inverter is selected according to the power tracking error. The observability condition of PMSM speed regulating system is deduced, and the discrete sliding mode observer (D-SMO) and the high frequency rotation voltage signal injection method are introduced into the PIPC algorithm, respectively, in order to realize the PIPC sensorless control of inverter in full speed range. 3) according to the structure of the PIPC algorithm, the instantaneous active power prediction value in the PIPC algorithm is taken directly as the load power variable of the double PWM converter, according to the power flow situation of the dual PWM converter. The IP-PCC structure of the PWM rectifier and the PIPC algorithm of the PWM inverter are coordinated by the load power feedforward control. It is not necessary to observe the load power separately in order to realize the coordinated control of double PWM converters. On the basis of theory and simulation analysis, the experiment platform of motor speed regulation system of double PWM converter is built. The IP-PCC experiment of the PWM rectifier on the network side, the PIPC experiment of the PWM inverter on the motor side and the coordinated control experiment of the load power feedforward of the double PWM converter are designed from two aspects of hardware and software, and the on-line debugging is carried out to verify the validity and feasibility of the proposed theory.
【学位授予单位】：天津大学
【学位级别】：博士
【学位授予年份】：2014
【分类号】：TM46

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