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In the double closed loops control strategy of three-phase voltage source PWM rectifier in the synchronous reference frame, the linear PI control is usually adopted in the voltage control loop, which cannot reflect the nonlinear nature of the PWM rectifier, and restricts the systempsilas control performance. According to the analyses on the voltage equation of the PWM rectifier, a voltage control...
In wind power generation system the grid-connected inverter is essential device for energy conversion and transmission, of which the performance has a direct influence on the entire wind power generation system. The inductance of AC side affects the static and dynamic performance of the whole system when the grid-connected inverter is actively inverting. So the design of inductance of AC side is essential...
Induction motor drives without speed sensors have been developed in these years. This paper presents a speed estimation of induction motors by using an observer and PWM carrier frequency components. In this method, three phase triangular carrier waves are used at zero and low frequency and an observer is used at other frequency. The proposed method is not affected from the stator resistance error...
In order to improve the performance of three phase voltage source PWM rectifiers, this paper presents a passivity-based control (PBC) strategy based on port-controlled Hamiltonian with dissipation (PCHD) model established from the rectifierspsila power circuit. With the model, a passivity-based controller for PWM rectifiers is designed by using Inter-connection and Damping Assignment passivity-based...
For the mathematical model of PWM inverter under the d-q rotary coordinate system, there exists coupling between the active current and reactive current, which makes it difficult manipulating the power injected into AC grid from distributed generation system. So as to handle the problem, a novel current decoupling strategy based on the input-output linearization is employed in the paper and the PI...
In this paper a predictive control scheme is proposed for the VSC-HVDC system to achieve decoupled control of active and reactive power. The proposed control scheme, which is of simple structure, offers high tracking accuracy, fast dynamic response and good robustness. A case of two-terminal three-level VSC-HVDC system is developed in MATLAB/SIMULINK to verify the validity of the proposed control...
The permanent magnet brushless DC motor speed control system (PMBDCSCS) is simple control, high power density and high performance, and used in many domains. The voltage inverter used widely in the PMBDCSCS operates commonly in the six PWM methods: H_PWM_L_PWM, ON_PWM, H_PWM_L_ON, H_ON_L_PWM, PWM_ON and PWM_ON_PWM. In this paper, the six PWM methods are introduced in theory and are compared in detail...
The Selective Harmonic Elimination (SHE) PWM technique has become a significant PWM method for less switching loss for three-level neutral-point-clamped (NPC) inverter. This paper introduces an online optimization approach to the SHEPWM technology based on genetic algorithm and BP neural network. The method doesnpsilat need to preset the initial values and to predict the trend of these values over...
On the basis of analyzing three-level inverter direct torque control principle (DTC) , a new synthesizing vectors PWM method of three-level DTC is presented, which can not only effectively control neutral- point voltage, but also restrain higher dv / dt of output voltage and improve three-level DTC output performance ,reduce torque ripple. Through theory analysis and experiment research, the author...
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