Circuit breaker closing time estimation method based on distance power inverse proportion method

Abstract

The invention relates to the technical field of circuit breakers, in particular to a circuit breaker closing time estimation method based on a distance power inverse proportion method, which comprises the following steps: analyzing the closing process of a circuit breaker to obtain that the closing of the circuit breaker has mechanical dispersity; calculating an expected estimated value of the distribution function of the next closing time of the circuit breaker according to a distance power inverse proportion method; according to a distance power inverse proportion method, making variance estimation value calculation on the distribution function of the next closing time of the circuit breaker; and modeling the closing time of the circuit breaker according to the expected estimated value, the variance estimated value and a normal distribution model. Uncertainty of the mechanical dispersity of the circuit breaker is overcome by introducing a normal distribution function in calculation, so that the accuracy of closing time estimation is improved; the distance power inverse proportion method is used for estimating the closing time of the circuit breaker for the first time, the proportion of recent data is reasonably improved, and the method has high feasibility and accuracy.

Description

technical field [0001] The invention relates to the technical field of circuit breakers, in particular to a method for estimating closing time of a circuit breaker based on a distance inverse power method. Background technique [0002] DC transmission has the advantages of large transmission power, low line cost, and good control performance. It is an important means for high-voltage, large-capacity, long-distance power transmission and asynchronous networking in developed countries. my country wants to realize large-scale west-to-east power transmission. , the large-scale application of HVDC transmission is an inevitable choice. The AC filter is one of the important equipment in the DC transmission system. It not only provides the reactive power required for commutation, but also filters out harmonics. [0003] The phase-selection closing device can control the circuit breaker to perform closing operation at an appropriate time, effectively shortening the transient process ...

AI Technical Summary

Problems solved by technology

Reasonably predicting the closing time of the next closing is very important to the phase selection closing technology. Due to the difference in manufacturing process and level, the circuit breaker has a certain dispersion of operating time. Due to the mechanical dispersion of the circuit breaker, it will change with time. Due to constant changes with the external environment, the filter field circuit breaker of the converter station is only evaluated according to the test data at the factory, and the dispersion of the closing speed of the circuit breaker has certain limitations. It is difficult to study the evaluation method from the principle.

In the past, there are mainly two types of circuit breaker closing time estimation. The first method is to simply estimate the average value of previous data. This method cannot consider the characteristics that the mechanical dispersion of circuit breakers will change over time, and the accuracy rate is low; The second method uses the external environment as a variable to make predictions in principle. Due to too many variables involved, this method has low feasibility and cannot take into account all influencing factors, so the accuracy of the prediction results is low.

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