Novel high-voltage circuit breaker and control method thereof

Abstract

The invention discloses a novel high-voltage circuit breaker and a control method thereof. The novel high-voltage circuit breaker mainly comprises a measuring unit, a DSP control unit, a driving unit,an inversion unit, a brushless DC motor and a high-voltage circuit breaker operating mechanism unit. The control method comprises the following step: improving an observer to enable the observer to have disturbance estimation capability so as to realize disturbance rejection tracking control. The embodiment of the invention provides a novel high-voltage circuit breaker and a control method thereof, so as to realize motion characteristic control of the high-voltage circuit breaker. The mathematical description of the operating mechanism has a certain inexact part, the complex system of the operating mechanism has a non-linear part, and the opening and closing of the operating mechanism are subjected to different electric forces when different line currents exist, which all affect the control of the operating mechanism. The above parts are defined as disturbance, and the disturbance is observed and estimated through an improved control strategy; disturbance elimination is achieved through feedback, and finally the control target of the performance requirement of the high-voltage circuit breaker in the moving process is achieved.

Description

technical field [0001] The invention relates to the technical field of high-voltage circuit breakers, in particular to a novel high-voltage circuit breaker and a control method thereof. Background technique [0002] High-voltage circuit breaker is one of the most important power equipment in the power system. It plays a role in controlling and protecting the power grid, that is, normal switching on and off of related electrical equipment, as well as coordination protection and automatic device removal of faults in case of faults. The value of the equipment protected by the high-voltage circuit breaker is high. At the same time, it should ensure the timeliness of fault removal, prevent the expansion of the fault range, and ensure the normal operation of the power grid. The whole mission of the high-voltage circuit breaker is, in the final analysis, reflected in the opening and closing action of the contact of the high-voltage circuit breaker, and the opening and closing actio...

AI Technical Summary

Problems solved by technology

[0003] The high-voltage circuit breaker provided by the prior art has the following two disadvantages: First, the traditional operating mechanism of the high-voltage circuit breaker includes electromagnetic, spring, pneumatic and hydraulic pressure, etc. Non-linear relationship, the mathematical description of the system design is inaccurate, and the controller designed by this system has a large dispersion of response time, resulting in unsatisfactory dynamic control characteristics; Under different conditions (such as no-load, light load, load change, short-circuit fault, etc.), the electric power received when breaking is different, resulting in different operating circuit parameters, and the required breaking capacity of high-voltage circuit breakers is different.

These can be regarded as disturbances of the system, and traditional control methods are difficult to achieve good dynamic control characteristics

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