Topic
PWM rectifier
About: PWM rectifier is a research topic. Over the lifetime, 2254 publications have been published within this topic receiving 25614 citations.
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TL;DR: Two identical three-phase, bipolar transistor, controlled-current, pulsewidth modulation (PWM) power modulators are integrated so that one functions as a rectifier and the other as an inverter in an AC drive system.
Abstract: Two identical three-phase, bipolar transistor, controlled-current, pulsewidth modulation (PWM) power modulators are integrated so that one functions as a rectifier and the other as an inverter in an AC drive system. The rectifier input currents maintain near-60-Hz sinusoidal waveforms with unity power factor. A leading power factor is also possible. The modulators do not depend on the availability of bidirectional switch elements. Performance as a polyphase induction motor drive under motoring and regenerative braking is reported. The study includes digital simulation of operation as a synchronous motor drive. >
144 citations
TL;DR: In this paper, a new and fast model-based approach for open-switch fault diagnosis of the single-phase pulse width modulation rectifier, based on the mixed logical dynamic model and residual generation, is presented.
Abstract: The converter with a single-phase rectifier, a dc-link circuit and a three-phase inverter is widely applied in high-speed railway electrical traction drive system. The fault frequency of single-phase rectifier is higher than that of three-phase inverter. Thus, this paper presents a new and fast model-based approach for open-switch fault diagnosis of the single-phase pulse width modulation rectifier, based on the mixed logical dynamic model and residual generation. It requires no additional hardware but only some measurements and command signals which are available in control system. This diagnosis method is quite suitable for electrical traction application due to the fast diagnosis time, simple structure and high reliability. Experimental results confirm the effectiveness and accuracy of the proposed algorithm. It is shown that such diagnosis method can locate the faulty switch in a few milliseconds which is important to avoid catastrophic consequences.
143 citations
TL;DR: In this paper, an improved two-vectors-based MPC was proposed, which relaxes the vector combination to two arbitrary voltage vectors and achieved better steady-state performance without affecting the dynamic response.
Abstract: Finite-control-set model predictive control (FCSMPC) has been proposed as a powerful control strategy for the power control of the pulse-width modulation rectifier. However, conventional FCSMPC applies only one voltage vector during one control period, which still presents relatively high power ripples. Introducing a zero vector in combination with a nonzero vector during one control period can improve the steady-state performance of the conventional FCSMPC, but the fixed vector combination is not an optimal solution in minimizing power errors. This paper proposes an improved two-vectors-based MPC, which relaxes the vector combination to two arbitrary voltage vectors. Compared to prior improved MPC with fixed vector combinations, the proposed method achieves better steady-state performance without affecting the dynamic response. Furthermore, the average switching frequency is reduced by up to 29.5% in average. The principles of vector selection and optimal vector duration are introduced in detail. The results obtained from two kinds of three-vectors-based predictive control methods are also presented for the aim of comparison. Both simulation and experimental results confirm the theoretical study and the effectiveness of the proposed method.
140 citations
06 Feb 2000
TL;DR: In this paper, two different control strategies for a PWM rectifier without line voltage sensors are compared and the steady-state performance of both strategies is compared with regards to voltage unbalance and pre-distorted grid.
Abstract: In this paper two different control strategies for a PWM rectifier without line voltage sensors are compared. The direct power control (DPC) which has no need for line voltage measurements is compared to the conventional voltage oriented control (VOC) strategy in rotating coordinates with a novel line voltage estimator. The steady-state performance of both strategies is compared with regards to voltage unbalance and pre-distorted grid. Furthermore, the use of discontinuous modulation is motivated in the classical control strategy and is analyzed along with the novel line voltage estimator. It is shown that the VOC strategy with line voltage estimator exhibits several advantages compared to DPC. Some simulations and experimental results verifying the comparison are presented.
133 citations
TL;DR: In this article, a control scheme of three-phase PWM rectifiers eliminating both the AC input voltage and current sensors is proposed, where the phase angle and magnitude of the source voltage are estimated by controlling the deviation between the rectifier current and its model current to be zero.
Abstract: In this paper, a novel control scheme of three-phase PWM rectifiers eliminating both the AC input voltage and current sensors is proposed. The phase angle and the magnitude of the source voltage are estimated by controlling the deviation between the rectifier current and its model current to be zero. The input currents can be reconstructed from switching states of the PWM rectifier and the measured DC link currents. To eliminate the calculation time delay effect of the microprocessor, the currents ahead one sampling period are estimated by a state observer and then are used for feedback control. The proposed control scheme reduces the system cost and improves its reliability. The feasibility of the proposed AC sensorless technique for three-phase PWM rectifiers has been verified through experiments using a high performance DSP chip.
127 citations