Matrix Rectifier Research Articles

Analysis of the Input Harmonic Current of the Matrix Rectifier and the Design of its Input LC Filter

As a new type of pulse width modulate converter,the input current of matrix rectifier consists of a great deal of high-frequency harmony current. The harmony has a bad influence on the net side. So a input filter is needed to eliminate it. Through the approach of Fourier transform, the harmony wave of the matrix rectifier is discussed, and the conclusion of the value of high-harmony and the induction in inverse proportion is deduced. The inactive power that the capacitance absorbe determines its value. The range of the resonance frequency determine the range of the induction. From above analysis a basic design of input LC filter of matrix converter is given. The input filter has been verified in the matlab/simulink and good performances are achieved.

A Novel Absolute Value Logic SPWM Control Strategy Based on De-Re-Coupling Idea for High Frequency Link Matrix Rectifier

Matrix Rectifier has evolved from the traditional three phase to three phase Matrix Converter (MC) in recent years, and inherits merits of the traditional MC. Matrix Rectifier could be divided into isolated and non-isolated two types according to using high frequency transformer or not. A kind of isolated Matrix Rectifier topology, i.e., high frequency link Matrix Rectifier (HFLMR) has been selected as the study project. Space vector modulation is the mostly focused control strategy for the HFLMR, however its algorithm and its implementation are complicated and difficulty. So a novel straightforward absolute value logic SPWM control strategy based on De-Re-coupling idea has been proposed in this paper, which could realize unit power factor and DC voltage output, and made the transformer gain volt-second balance in a high frequency switching cycle. The validity and feasibility of the proposed control strategy have been well proved by the simulation and experiment results, and a special working phenomenon named as “the dual voltage endemism” has been analyzed in detail.

Design and Implementation of a Unity Power Factor Fuzzy Battery Charger using an Ultrasparse Matrix Rectifier

This paper presents a novel unity power factor fuzzy battery charger conception based on an ultrasparse matrix rectifier (USMR). The advantages of the proposed converter are low harmonic distortion in absorbed currents and nearly unity power factor over a wide operating output power range. Its circuit has only three switching components and low-energy-conversion loss. This reduces the cost and enhances the system's efficiency for high-voltage battery. Thus, the proposed fuzzy logic controller improves the line power quality and delivers admissible output power to the battery. Experimental results based on a 24-V battery charger are proposed to validate the proposed approach and to demonstrate its performance. The stability and performance of the battery charger are then verified by the constant current and constant voltage charge. The fuzzy control and space vector modulation algorithms are implemented with the Digital Signal Processor.

Vector operation of one-cycle controlled matrix rectifier

Vector operation of one-cycle controlled matrix rectifier A novel vector operated one-cycle control matrix rectifier (OCC-MR) is proposed in this paper. Matrix rectifier (MR) is a generalized buck three-phase AC-DC converter with four-quadrant operation capability. MR can also be the front-stage circuit of AC-DC-AC equivalent structure of MC. One-cycle control (OCC) is a nonlinear control technique, which integrates modulation algorithm and control strategy. By applying OCC to current control loop, the OCC-MR achieves balance only in a switching cycle, and realizes unitary input power factor. Furthermore, vector operation of OCC results in minimum switching losses. In order to make up for the insufficiency of OCC on load disturbance suppression, a PID controller is added onto output voltage control to improve load regulation. The OCC-MR features great simplicity, fast dynamic response and good immunity on input disturbance. On the basis of theoretical analysis, a systematic simulation of OCC-MR is implemented by means of Matlab/Simulink. Both static state performance and dynamic state performance of OCC-MR are discussed deeply. The simulation results have proved theoretical analysis of the vector operation of OCC-MR, and the control effects are satisfactory.

Research of One-Step Commutation Strategy in Matrix Rectifier

Due to the absence of natural free-wheeling paths, the commutation in matrix rectifiers is much more complicated than in the other kinds of AC-DC converters. In this paper, based on the measurement of the output current direction and the signs of the input line-to-line voltages, a new one-step commutation strategy is applied in the design of matrix rectifier. Experimental results show that the new method is valid and feasible, founding a basis of further practical application.

An Integration SPWM Strategy for High-Frequency Link Matrix Converter With Adaptive Commutation in One Step Based on De-Re-Coupling Idea

When matrix converter (MC) and high-frequency link (HFL) are combined together, they become more complex and gain a safe commutation for the use of high-frequency transformer. To realize energy conversion and transmission, and to achieve reliable and safe commutation at the same time are particularly important and desirable. HFL matrix converter (HFLMC) can be divided into two types: high-frequency link matrix inverter (HFLMI) and high-frequency link matrix rectifier (HFLMR). A three-phase output HFLMI is selected as the object of this study, and a novel integration sinusoidal pulse width modulation (SPWM) control strategy with one-step adaptive commutation based on De-Re-coupling idea is proposed for it. After expounding on the De-Re-coupling idea, a kind of HFLMC equivalent circuit model based on the high-frequency transformer equivalent circuit is built up. Then, a detailed analysis of the voltage stress on power devices of the HFLMC by using this model is performed. A safe operation evaluation criterion of HFLMC is also gained. A suggestion of how to select carrier wave for integration SPWM is ascertained through detail discussion, and two kinds of specific Re-coupling logic circuits are presented, and at last some experimental results are shown to make a certification for feasibility and effectiveness of the new proposed SPWM strategy.

Analysis on Performances of Matrix Rectifier under Abnormal Conditions

Matrix rectifier (AC-DC MC) is a four-quadrant AC-DC power converter device with compact topology. This paper concerns the influence of abnormal power supply conditions to the matrix rectifier. The input and output performances of matrix rectifier with pure sinusoidal supply voltages are discussed. The input currents are symmetrical sinusoidal without any low-order components. But due to the absence of DC capacitors, the abnormal conditions at input side affect the input and output performances directly, which introduce ripples into the DC output and cause the distortion of input currents. In this paper, the low-order harmonic components in input currents, and ripples at output side are theoretically analyzed under conditions that the input voltages are unbalanced and non-sinusoidal respectively. The simulation research is carried out to verify the theoretical analysis, and the results, which demonstrated the analysis conclusions, are given.

A Study of Topology Based on Matrix Rectifier and AC Chopper Principle

A new frequency conversion device topology based on matrix rectifier and AC chopper called MCAC） is proposed, which is referred as AC chopper matrix converters. First, the basic configuration of these new topologies and the fundamental principle are introduced. Then, the validity and feasibility of the new topologies are tested by digital simulation and prototype experiments. The results indicate that the output voltage transfer ratio can be larger than 1.0, the output voltage waveform is very close to standard sine wave and the harmonic contents increase slightly, overcoming the drawbacks of conventional MCs that maximum voltage transfer ratio is 0.866. This study may provide inspiration for further engineering applications.