On-Line Identification of Winding Resistances and Load Torque in Induction Machines
On-Line Identification of Winding Resistances and Load Torque in Induction Machines
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DOI：
10.1109/tcst.2013.2285604
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发表时间：
2014-07
影响因子：
4.8
通讯作者：
C. M. Verrelli;A. Savoia;M. Mengoni;R. Marino;P. Tomei;L. Zarri
中科院分区：
文献类型：
--
作者：
C. M. Verrelli;A. Savoia;M. Mengoni;R. Marino;P. Tomei;L. Zarri
转子和定子电阻沿着负载转矩在感应电机中通常是不确定的量。电机发热使绕组电阻在运行过程中发生变化，而负载扭矩严格取决于应用。所有这些变量都需要在线估计，以提高驱动器的性能，特别是最小化稳态功率损耗。本文设计了一种新的自适应观测器。它是能够指数估计的电机通量，并确定上述关键参数的定子电流/电压和转子速度测量。与文献中提出的其他解决方案相比，转子和定子电阻不在同一时间尺度上估计。因此，通过详细的稳定性证明，它不依赖于恒定的操作条件下的线性化参数的行为的直观启发的观察者的新见解。详细分析了仅依赖于外生信号的激励条件对估计误差系统的持久性，并给出了清晰的物理解释。所提出的解决方案的主要特点是整体简单的估计方案，低维的回归矩阵（正相关的未测量或不确定量的数量）和指数收敛到零的估计误差。仿真验证了所有数学推导的正确性。实验结果表明，所提出的方法在实施一个先进版本的间接磁场定向控制方案的有效性：不确定的转子磁链模量参考，最大限度地减少在稳态时的功率损耗，可以实际估计和实施。
Rotor and stator resistances along with load torque are typically uncertain quantities in induction machines. The machine heating makes the winding resistances vary during operation whereas the load torque strictly depends on the application. All those variables need to be on-line estimated to improve the drive performances and in particular to minimize the power loss at steady state. A new adaptive observer is designed in this brief. It is able to exponentially estimate the motor fluxes and to identify the aforementioned critical parameters from stator currents/voltages and rotor speed measurements. In contrast to other solutions proposed in the literature, rotor and stator resistances are not estimated on the same time scale. New insights on the behavior of an intuitively inspired observer are thus given through a detailed stability proof, which does not rely on linearization arguments around constant operating conditions. Persistency of excitation conditions, which only depend on exogenous signals to the estimation error system, are analyzed in detail and a clear physical interpretation is presented. Key features of the proposed solution are the overall simplicity of the estimation scheme, the low dimension of the regressor matrix (being exactly related to the number of unmeasured or uncertain quantities) and the exponential convergence to zero of the estimation errors. Simulations confirm the correctness of all the mathematical derivations. Experimental results show the effectiveness of the proposed approach in implementing an advanced version of the indirect field oriented control scheme: the uncertain rotor flux modulus reference that minimizes the power loss at steady state can be actually estimated and imposed.