ASSESSMENT OF EXTERNAL FACTORS INFLUENCE ON SELF-EXCITED INDUCTION GENERATOR OPERATION

Abstract

The object of the study is an induction generator, the self-excitation of which is provided by a capacitor exciter. Existing solutions for regulating self-excited induction generator do not ensure the stability of the output voltage when changing the rotation frequency and load power. This determines the need to assess the influence of external factors on the functioning of self-excited induction generator. During the study, the exciter capacitance was changed discretely by switching capacitors and changing their connection scheme. The subject of the study is the process of changing the output voltage of an induction generator depending on the rotation frequency, load power and exciter capacitance. The study was conducted using a computer model of an induction generator equipped with a capacitor exciter with a variable topology. The numerical experiment was conducted according to the full factorial experiment planning matrix with a central point. For each point of the plan, the self-excitation of the generator was simulated for each level of exciter capacitance. The coefficients of the linear mathematical model were estimated during regression analysis. The results of the full factorial experiment confirm the significant influence of the load power and rotation frequency on the required capacitance value to maintain the rated output voltage of the generator. Estimates of the parameters values of the linear regression model were obtained, which relates the required excitation capacitance of an induction generator to provide the rated output voltage with the rotor rotation frequency and the power of the active load. In this case, the component corresponding to the linear interaction of factors was rejected as statistically insignificant. It was established that the value of the required capacitance depends on the load power directly proportionally, and on the rotation frequency – inversely proportionally. The results of the study can be used when developing a control system for the operating parameters of an induction generator.