Power equipment state monitoring method, device and system
The embodiment of the invention provides a power equipment state monitoring method, device and system, and relates to the field of automatic monitoring. The invention can realize unification and centralization of monitoring data, thereby reducing waste of information resources and communication resources. The method comprises the following steps: receiving original information of power equipment state acquired by an information acquisition terminal; and converting the original information into state characteristic parameter values, which are directly available for a background monitoring device, according to unified coding rules, and transmitting the state characteristic parameter values to the background monitoring device, so that the background monitoring device can monitor the power equipment state according to the state characteristic parameter values. The invention is used for monitoring power equipment state.
This paper develops a sliding mode-based observer for load torque and parameters variations control of permanent magnet synchronous motor (PMSM) drives. A sliding mode control scheme combined with an observer is useful as a means to depress chattering and the robustness is increased. It is demonstrated that the robustness of an PMSM is improved by using the proposed observer and that the robustness is more enhanced by varying the controller parameters according to the value of the estimate of the disturbance. This paper also presents a detailed comparison of SMC controller with observer for PMSM. The observer designs the implementation aspects, and a comparative study on the extensive experimental results are given.