变频空调压缩机驱动系统低频转矩补偿控制算法研究

发布时间：2018-04-30 19:12

本文选题：永磁同步电机 + 变频空调　；参考：《中南大学》2014年硕士论文

【摘要】：摘要：随着稀土材料、电力电子技术以及现代交流伺服电机驱动控制技术的发展,永磁同步电机(PMSM)在国民经济中的各个领域应用越来越广泛。永磁同步电机作为家用变频空调压缩机是节能驱动技术发展的核心,已成为当前研究的热点课题,但变频空调压缩机驱动系统低频负载转矩脉动的问题尚未得到很好的解决。本论文将针对压缩机低频运行时负载转矩脉动的问题展开研究,主要研究内容如下： (1)针对变频空调压缩机低频运行时负载转矩波动剧烈的问题,在深入分析压缩机低速运行时负载转矩特性的基础上,提出了一种基于控制参数化的低频转矩补偿控制算法。该方法将给定的时间区间划分成若干个等间隔的子区间,在每个子区间内周期非线性负载用一个常值负载进行等效,通过优化计算性能指标函数来获得各子区间内控制输入值。控制参数化方法能够很好的适应电机低频时的机械特性,而且可以很大程度上提升低频段的控制精度。 (2)针对变频空调压缩机低速运行时负载转矩脉动的问题,提出了一种基于模型预测控制的低频转矩补偿控制方法。首先,对两相旋转坐标系下永磁同步电机数学模型中的非线性项进行了简化,针对模型中存在负载扰动的问题,引入交轴电压补偿控制,从而获得线性化的电机模型。其次,采用电机转速和电流的实时测量值对电机负载转矩进行实时估计,利用线性化的模型预测系统未来动态。通过优化未来的控制动作使得预测的系统输出接近控制参数化方法优化求解的理想控制曲线。最后,将每个采样时刻求解的优化控制量的第一步作用于实际系统。通过仿真和实验结果分析说明了所提控制策略的正确性和可行性。图36幅,表2个,参考文献62篇。
[Abstract]:Absrtact: with the development of rare earth materials, power electronics technology and modern AC servo motor drive control technology, PMSM (permanent Magnet synchronous Motor) is more and more widely used in various fields of national economy. Permanent magnet synchronous motor (PMSM), as the core of energy saving drive technology, has become a hot topic in the field of energy saving, but the problem of low frequency load torque ripple in the drive system of variable-frequency air conditioner compressor has not been solved well. This paper will focus on the load torque ripple of the compressor in low frequency operation. The main research contents are as follows: 1) aiming at the problem that the load torque fluctuates sharply during the low frequency operation of the variable frequency air conditioner compressor, a low frequency torque compensation control algorithm based on the control parameters is proposed based on the in-depth analysis of the load torque characteristics of the compressor in the low speed operation. In this method, a given time interval is divided into several equal intervals, and the periodic nonlinear load is equivalent to a constant load in each subinterval, and the control input value is obtained by optimizing the performance index function. The control parameterization method can well adapt to the mechanical characteristics of the motor at low frequency, and can greatly improve the control accuracy of the low frequency band. In order to solve the problem of load torque ripple in low speed operation of variable frequency air conditioner compressor, a low frequency torque compensation control method based on model predictive control is proposed. Firstly, the nonlinear terms in the mathematical model of permanent magnet synchronous motor (PMSM) in two-phase rotating coordinate system are simplified. In order to solve the problem of load disturbance in the model, the AC axis voltage compensation control is introduced to obtain the linearized motor model. Secondly, the real time measurement of motor speed and current is used to estimate the motor load torque in real time, and the linearized model is used to predict the future of the system. By optimizing the future control action, the predicted system output is close to the ideal control curve solved optimally by the parameterized control method. Finally, the first step of the optimal control is applied to the real system. Simulation and experimental results show the correctness and feasibility of the proposed control strategy. There are 36 figures, 2 tables and 62 references.
【学位授予单位】：中南大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TB652;TM341

【参考文献】