This paper proposes a sliding mode controller based on robust model reference adaptive proportional-integral(RMRA-PI)control for a stand-alone voltage source inverter(SA-VSI).The proposed controller has two control lo...This paper proposes a sliding mode controller based on robust model reference adaptive proportional-integral(RMRA-PI)control for a stand-alone voltage source inverter(SA-VSI).The proposed controller has two control loops where the coefficients of PI controller are regulated by the adaptive sliding law.This method is used to regulate the output voltage of the inverter under different load conditions and uncertainty,and adapts the output to the reference model to reduce the total harmonic distortion(THD).In this paper,the stability of the proposed controller is proven by using Lyapunov's theory and Barbalet’s lemma.The proposed controller performs well in voltage regulation such as low THD under sudden load change and uncertainty.Also,the results of the proposed controller are compared with PI controller to show the effectiveness of the presented control system.展开更多
A new adaptive single-pole autoreclosure technique based on the magnitude of fault point voltage is presented.After fault phase tripping,the fault point voltage of transient faults is essentially different from that o...A new adaptive single-pole autoreclosure technique based on the magnitude of fault point voltage is presented.After fault phase tripping,the fault point voltage of transient faults is essentially different from that of permanent faults,so the magnitude of fault point voltage is used to distinguish fault nature.Fault point voltage can be calculated through uniform transmission line equation.Considering that fault point voltage changes with fault location and transition resistance,a concept of real-time action voltage setting is put forward.The technique solves the problem that criterions based on terminal voltage could be easily affected by inductive coupling voltage and transition resistance.Simulation results show that the method is reliable.展开更多
文摘This paper proposes a sliding mode controller based on robust model reference adaptive proportional-integral(RMRA-PI)control for a stand-alone voltage source inverter(SA-VSI).The proposed controller has two control loops where the coefficients of PI controller are regulated by the adaptive sliding law.This method is used to regulate the output voltage of the inverter under different load conditions and uncertainty,and adapts the output to the reference model to reduce the total harmonic distortion(THD).In this paper,the stability of the proposed controller is proven by using Lyapunov's theory and Barbalet’s lemma.The proposed controller performs well in voltage regulation such as low THD under sudden load change and uncertainty.Also,the results of the proposed controller are compared with PI controller to show the effectiveness of the presented control system.
基金supported by National Natural Science Foundation ofChina(No.50477037,No.50607014)
文摘A new adaptive single-pole autoreclosure technique based on the magnitude of fault point voltage is presented.After fault phase tripping,the fault point voltage of transient faults is essentially different from that of permanent faults,so the magnitude of fault point voltage is used to distinguish fault nature.Fault point voltage can be calculated through uniform transmission line equation.Considering that fault point voltage changes with fault location and transition resistance,a concept of real-time action voltage setting is put forward.The technique solves the problem that criterions based on terminal voltage could be easily affected by inductive coupling voltage and transition resistance.Simulation results show that the method is reliable.
