Double-stator synchronous phase modifier of rotor energy storage type, and control method thereof

Abstract

The invention relates to a double-stator synchronous phase modifier of a rotor energy storage type, and the synchronous phase modifier comprises a power electronic device and a phase modifier. The power electronic device includes an AC / DC converter and a DC / AC converter which is connected with the DC side of the AC / DC converter. The phase modifier includes stators and a rotor, and the stators include an outer stator and an inner stator. Switches are respectively connected between one end of the outer stator and one end of the inner stator and between the other end of the outer stator and the other end of the inner stator. One end of the outer stator and the AC side of the AC / DC converter are connected with a power grid, and one end of the inner stator is connected with the AC side of the DC / AC converter. The invention also relates to a control method for the double-stator synchronous phase modifier. The outer rotor connected with the power grid remains the synchronous with the power grid without affecting the conventional reactive power compensation and the normal operation of the phase modifier. When the frequency is constant at 50 Hz, the phase modifier performs the active powerconsumption for the grid, enlarges the application range, and facilitates the normal and stable operation of the phase modifier in the power grid.

Description

technical field [0001] The invention relates to the field of stable operation of electric power systems, in particular to a double-stator synchronous condenser with rotor energy storage and a control method thereof. Background technique [0002] A synchronous motor is an AC motor that needs to keep the rotor speed and the stator's rotating magnetic field at the same speed. In terms of physical structure, the stator and rotor of the generator are two completely independent and non-interfering individuals. The stator of the generator is an active source , to generate induced electromotive force, the rotor of the generator is a reactive power source, and the winding introduces direct current from the outside to establish a magnetic field. Under the drag of the prime mover, the voltage is established and the reactive power of the alternating current is transmitted outward. From the perspective of electromagnetic principles, the two are closely related. In connection, the active ...

AI Technical Summary

Problems solved by technology

The synchronous motor will appear that the rotor speed is no longer consistent with the synchronous speed of the stator's rotating magnetic field, the speed will drop, and enter the asynchronous operation state. When the speed is not reached or close to the rated speed, if the excitation is switched on, it is likely to produce asynchronous phenomenon, mainly because the synchronous motor is constantly damaged by various disturbances from the power grid, load and the motor itself during the use of the motor shaft. Secondly, during the operation of the synchronous motor, if the excitation voltage is reduced or the supply voltage is reduced, so that the overload capacity of the synchronous motor, that is, the maximum output torque is less than the mechanical load torque, the synchronous motor will be out of step

Images