PWM rectifier

About: PWM rectifier is a research topic. Over the lifetime, 2254 publications have been published within this topic receiving 25614 citations.

Direct power control method of voltage source PWM (pulse width modulation) rectifier system

Abstract: The invention provides a direct power control method of a voltage source PWM (pulse width modulation) rectifier system. Based on an inner-loop power and outer-loop voltage control method adopted in a DPC (data processing control) method, set values of active power and reactive power are compared with actual values, and a voltage vector is selected by querying a switch list to control the on-off state of the PWM rectifier. According to the control method provided by the invention, a state variable marking the active power and the reactive power is added, the location of a space vector is redefined and a segmented switch list is constructed, thus enhancing the decoupling control on the active power and the reactive power and the response capability, and improving the power factor of the rectifier. The calculation and experiment results show that the grid side input current is sine and the instantaneous power dynamic and static control characteristics of the system are better.

High quality rectifiers with reduced thd for enhanced mains power quality - vienna with synchronous logic

Abstract: A synchronous logic control based three-phase boost unity power factor rectifier unit that works as an interface to ensure high energy efficiency by reducing reactive power consumption, as well as to maintain a constant DC-bus voltage. This paper discusses the determination of performance characteristics of Vienna rectifier topology with the synchronous logic based control. Furthermore this enabled the design and development of a three-phase active converter system that was built and tested with the inputs and output. This paper also describes the Vienna Rectifier’s power stage and synchronous logic control technique, with particular emphasis on finding differences between real prototype results and the simulation results. The design and experimental performance of a three-phase PWM rectifier with a power output of 3 kW is presented. The real prototype results confirm with the simulation results.

LED centralized direct-current power supply system and operating method thereof

Abstract: The invention provides a light emitting diode (LED) centralized DC (direct-current) power supply system and operating methods thereof. The proposed DC power supply system comprises a three-phase AC (alternating-current) input interface, a DC power supply output interface, N+1 three-phase PWM (pulse width modulation) rectifier modules, LED cluster loads and a power supply management module. The proposed operating methods are described as following: the power supply management module adjusts the duty ratio of the three-phase PWM rectifier modules, based on the control signals formed by synthesizing the information about voltage and current of the positive and negative output buses, the three-phase AC input ends, control signals and output of the three-phase PWM rectifier modules, hence AC voltage of power grid can be directly converted into adjustable DC voltage by the PWM rectifier.

Input impedance modeling of multipulse rectifiers by double-fourier series method

Abstract: Rectifier input impedance models are required for stability analysis of ac power systems with significant amount of rectification loads. Such stability analysis is particularly important for mobile and autonomous systems, such as aircraft and ship power systems, where high-power, multipulse rectifiers often dominates the loads. Averaging techniques can be applied to develop input impedance models for PWM rectifiers. To model the input impedance of line-frequency rectifiers, a direct linearization technique was developed recently and has been applied to model direct multipulse rectifiers without using inter-phase transformers. This paper extends the previous work and uses double-Fourier series method to develop describing (mapping) functions for the rectifier bridge. The double-Fourier method overcomes the limitations of conventional Fourier analysis which requires the perturbation frequency to be commensurable with the line fundamental frequency. The method is also applied to model the input impedance of multipulse rectifiers with interphase transformers. Analytical input impedance models are presented and validated by numerical simulation and experimental results.

The optimized strategy for input current harmonic of low switching frequency PWM rectifier

Abstract: The industry application of High-power medium-voltage drives converter is an appealing spot in Power electronics technology in recent years. This paper presents an optimized control strategy for input current harmonic of rectifier of three-level NPC back-to-back converter under low switching frequency conditions. A modified P-N SVPWM method includes asymmetrical regular sampling, even-order harmonic elimination and natural DC bus balancing is applied for optimize the THD performance of input currents. And a modified proportional sinusoidal signal integrator method based on control scheme in two phase stationary reference frame which is different from ordinary direct-quadrature (DQ) rotating reference frame is proposed. It provides a specific input current harmonic elimination performance especially considerable in low switching frequency circumstance. Simulation and experimental results based on a rectifier of a 75kVA three-level NPC back-to-back converter prototype with a 400Hz device switching frequency constraint show satisfactory performance.