Method for physical simulation of transient state and dynamic state of power live load in power system

Abstract

The invention relates to a method for physical simulation of the transient state and the dynamic state of a power live load in a power system and belongs to the technical field of electromechanical control and physical simulation based on electric power and power systems. According to the method for physical simulation of the transient state and the dynamic state of the power live load in the power system, according to the demand for simulation of different types of live loads, the armature current Ia which needs to be applied to a separate excitation direct-current generator is calculated based on the angular velocity omega of a rotating shaft which is connected with an asynchronous motor and the separate excitation direct-current generator; on the premise that the magnetic flux phi of the separate excitation direct-current generator is kept constant, due to the fact that Te is equal to CTphiIa, the change of the armature current Ia of the separate excitation direct-current generator enables the electromagnetic torque Te of the separate excitation direct-current generator to change at the same proportion, the change of the electromagnetic torque Te acts on the rotating shaft which is connected with the asynchronous motor and the separate excitation direct-current generator, the effect caused by the fact that a real load acts on the rotating shaft is achieved, and the simulation of the mechanical features of the load is achieved. The method for physical simulation of the transient state and the dynamic state of the power live load in the power system has the advantages of being simple, convenient to implement, easy to implement, good in control performance and the like; test results show that the precision of simulation, generated through the method, of the power live load meets the demands of physical tests.

Description

technical field [0001] The invention relates to a power dynamic load transient state and dynamic physical simulation method in a power system, which belongs to the technical field of physical simulation and electromechanical control based on power and power systems. Background technique [0002] Experimental techniques and conditions play an increasingly important role in modern scientific research and product production, and scientific researchers require that experiments can be carried out conveniently under as realistic a situation as possible. Motor load is the most important part of modern industrial, agricultural, commercial and residential electrical loads, and the mechanical loads it bears in practical applications are characterized by complexity and diversification. With the rapid development of science and technology, the mechanical load borne by the motor is becoming more and more complex. Considering the nature of the actual production process, it is also unreali...

AI Technical Summary

Problems solved by technology

[0003] Traditional electric dynamic load physical simulation often needs to introduce torque feedback, but it is difficult to measure the shaft torque of the motor directly through the torque sensor, and the signal collected by the sensor needs to be filtered, which will result in a lower bandwidth

At the same time, the introduction of torque feedback may cause excessive torque or negative torque due to improper control, resulting in damage to the motor

In some schemes, torque control of DC motors that generate load mechanical characteristics requires measurements of flux linkage and flux across air gap pairs, which are difficult to obtain in motors

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