基于反馈模型逆变换原理的参量辨识研究

Parameter identification based on principle of feedback model in verse transformation

针对工程上模型求逆实现困难,以及反馈控制对模型求逆进行参量辨识的理论模糊不清等问题,推导并分析了利用反馈控制对已知模型进行逆变换的数学关系,提出了反馈模型逆变换原理,并讨论了利用该原理进行参量辨识的电气自动控制系统应用实例.结果表明,该原理在工程上易于实现,利用该原理构造的电机负荷转矩观测器解决了工程上逆模型难以实现的问题,构造的凸极同步电机转子激磁电流观测器解决了正模型已知逆模型求取困难的问题,该原理也可用于无速度传感器异步电机速度观测.

It is difficult to obtain the inverse models of known models in field projects. Furthermore, the principle using feedback control to obtain inverse models is not clear. To solve these problems, a mathematical relation using feedback control to obtain the inverse models of known models was derived and analyzed, and the principle of feedback model inverse transformation was presented. Examples using this principle to identify the parameters in electrical automation control system show that this principle is easy to implement in field projects. The motor load torque observation model constructed using this principle solves the problem that the inverse model is difficult to implement in field project, and the exciting-current observation model of salient pole synchronous motors constructed using this principle solves the problem that the positive model is known, but the inverse model is difficult to obtain. The principle can also be used in the speed observation of asynchronous motors without speed sensors.