A flux linkage observation method and system for an electrically excited synchronous machine

Abstract

The invention discloses a flux linkage observation method and a system of an electrically excited synchronous machine. The method comprises the following steps: according to a mathematical model of the electrically excited synchronous machine in a dq two-phase rotating coordinate system, a state equation of the electrically excited synchronous machine is established with a stator flux linkage, a rotor flux linkage and a damping flux linkage thereof as state variables. According to the state equation and the preset feedback matrix, the full-order flux observer of the electrically excited synchronous machine is constructed by using the modern control theory. Acquiring d-axis and q-axis components of excitation voltage and stator voltage of an electrically excited synchronous machine, and acquiring d-axis and q-axis components of excitation current and stator current of the electrically excited synchronous machine; According to the obtained voltage and current of rotor and stator, the flux linkage of electrically excited synchronous machine is observed by full-order flux observer. As can be seen, the present application establishes a full-order flux linkage model to observe the flux linkage of an electrically excited synchronous machine, and the steady-state accuracy and the dynamic performance are excellent, thereby ensuring the high-performance control of the motor control system.

Description

technical field [0001] The invention relates to the field of high-power AC transmission, in particular to a flux linkage observation method and system of an electrically excited synchronous motor. Background technique [0002] As a typical AC drive motor, electrically excited synchronous motor has the advantages of high power factor, high motor efficiency, high overload multiple and small moment of inertia compared with asynchronous motor, so it is widely used in the field of high-power AC drive. At present, there are two main control methods for electric excitation synchronous motors: vector control based on field orientation and direct torque control based on torque. In order to realize the control strategy of the motor control system with high performance, both control methods need to obtain the flux linkage of the electric excitation synchronous motor, and the accuracy of the acquired flux linkage determines the control performance of the system to a large extent. Theref...

AI Technical Summary

Problems solved by technology

For the open-loop flux linkage model, the open-loop flux linkage model adopts the open-loop flux observation method, which is easily affected by the motor parameters, and the motor parameters will change with the change of temperature and working conditions, so the open-loop The accuracy of the flux linkage model to observe the flux linkage is low

For the hybrid flux linkage model, the hybrid flux linkage model is essentially a reduced-order flux linkage model, and the steady-state accuracy and dynamic performance are not excellent enough to ensure the high-performance control of the motor control system

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