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Identification Algorithm for Three-phase Leakage Based on Least Square Method

Author: ZengZuo
Tutor: YangHao
School: Chongqing University
Course: Electrical Engineering
Keywords: Transformer protection Balance equation equivalent circuit The method of least squares Parameter Identification
CLC: TM407
Type: Master's thesis
Year: 2009
Downloads: 160
Quote: 1
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Abstract


Power transformer electrical power system is the most important one of the master , is a complete different voltage level of electrical energy is converted hub , its operating status directly affect the safe and stable operation of the power system , and the cost is very expensive , power transformers , must be based on the need to set the appropriate protection. In the past, the differential protection as the main protection of transformers , but with the increasing complexity of the protection requirements of the correct action rate and power system , differential protection is no longer adapted to the new requirements of the times . Today , based on the principle of the protection of the equivalent circuit , the power characteristics are to get rid of the shackles of the original ideas , the differential protection alternative , but they are assumed to be equal to the leakage inductance of the transformer secondary windings , thus affecting the protection of the right action the rate of further improved. To this end , this paper is dedicated to the identification algorithm to find the three - phase leakage inductance . The paper describes the current transformer model and protection methods , including methods based on the principle of differential and some new ideas , and pointed out the advantages and disadvantages of the various methods . This paper focuses on the analysis pointed out that the assumption that the three - phase leakage inductance equal protection criterion is its rate of protection action can make a difference to improve the obstacles and based on the principle of protection of the balance equation of the equivalent circuit analysis of power transformers triangular side loop equation starting simultaneous star side of the loop equation , get a load closing time calculation of the three-phase winding leakage inductance parameter identification algorithm . In order to achieve the recognition of the three - phase leakage inductance by comparing selected the least squares method widely used today in the field of system identification and parameter estimation . In this paper, the method of least squares linear constraints recognition and identification signal interference to overcome transformer model can not be sufficient incentive caused not recognize some of its shortcomings and test data requirements . To establish transformer digital simulation and automatically mimic the true model , simulation load closing of the power transformer , and record the voltage and current data . Through the acquisition of the data analysis , the algorithm has good convergence , at the same time , also verify the correctness and accuracy of the algorithm .

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CLC: > Industrial Technology > Electrotechnical > Transformers, converters and reactors > General issues > Maintenance,repair
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