Research On Transient Operation Performance Of Stator Double Winding Induction Generator Syste

The High-low Voltage Dual Stator Winding Induction Generator is a special type of generator that integrates power generation and voltage transformation.It realizes the function of reactive power compensation for the induction generator with load on the high voltage winding side by the low voltage winding side.Given the nonlinearity and complexity of the winding circuit of the Dual Winding Induction Generator,this paper mainly adopts the eigenvalue analysis method to study and analyze the transient operating performance of the generator under self-excited voltage buildup,parameter changes,and fault short circuits.Starting from the physical model of the Dual Winding Induction Generator,the internal physical process during generator operation was analyzed.Based on the electromagnetic relationship of the generator,a mathematical model in a three-phase stationary coordinate system was derived.By using coordinate transformation,the three-phase coordinate system was transformed into a two-phase coordinate system,relieving the coupling relationship between the stator and rotor windings.Through the no-load test of Dual Winding Induction Generator,the magnetization curve of the generator with the variation of excitation inductance and excitation current was fitted.Based on the equivalent circuit of the Dual Winding Generator in a two-phase stationary coordinate system,the generator state equation is derived from the circuit voltage equation,and the eigenvalues of the generator system are calculated.Starting from the principle of system stability,the essence of voltage building in Dual Winding Induction Generator is analyzed.Combining eigenvalue analysis and one-dimensional optimization methods,the critical values of capacitance and speed that can make the generator self-excited were calculated.Simulation analysis and experimental verification were conducted on the self-excited voltage building process of the Dual Winding Generator under different capacitance,speed,and residual magnetic values.The consistency between the simulation results and experimental results proves the correctness of the analysis method.Based on the two equivalent circuits of the Dual Winding Generator,no-load and on-load,simulation analysis and experimental verification were conducted on the transient process of the generator after sudden addition or reduction of different loads after no-load voltage building,as well as after changes in load and capacitance during on-load operation.The essence of generator transient process was explored from the perspective of system eigenvalue changes.Qualitative analysis was conducted on the impact of changes in motor speed on the Dual Winding Generator system.The simulation and experimental results are in good agreement with the eigenvalue analysis results,verifying the effectiveness of the analysis method.Simulation analysis and experimental verification were conducted on the transient process of the Dual Winding Induction Generator under fault conditions.By calculating the system eigenvalues under different parameters,the operating critical values of load,capacitance,and speed were analyzed,and the voltage collapse process that occurred after exceeding the critical values was simulated and experimentally conducted.Simulation analysis and experimental verification were conducted on the transient process of the Dual Winding Induction Generator after a three-phase short circuit occurred on the compensation winding side during no-load operation.Based on the mathematical model of the generator in the 120 coordinate system,the expression of short-circuit current was derived,and the amplitude and arrival time of the maximum short-circuit current of the Dual Winding Generator after three-phase short-circuit were obtained.Finally,the expression was verified through simulation.