A predictive control scheme for the indirect matrix converter including a method to mitigate the resonance effect of the input filter is presented. A discrete-time model of the converter, the input filter, and the load is used to predict the behavior of the instantaneous input reactive power and the output currents for each valid switching state. The control scheme selects the state that minimizes the value of a cost function in order to generate input currents with unity power factor and output currents with a low error with respect to a reference. The active damping method is based on a virtual harmonic resistor which damps the filter resonance. This paper shows experimental results to demonstrate that the proposed control method can generate good tracking of the output-current references, achieve unity input displacement power factor, and reduce the input-current distortion caused by the input filter resonance.

Current Control for an Indirect Matrix Converter With Filter Resonance Mitigation

This paper presents a current control scheme with instantaneous reactive power minimization for an indirect matrix converter. The strategy uses the commutation state of the converter in the subsequent sampling time according to an optimization algorithm given by a simple cost function and the discrete system model. Using this strategy, harmonics in the input current generated by the resonance of the input filter are strongly reduced. Simulation and experimental results with a laboratory prototype are provided in order to validate the control scheme, and the effects of a distorted source voltage and filter resonance are analyzed.

Instantaneous Reactive Power Minimization and Current Control for an Indirect Matrix Converter Under a Distorted AC Supply

This paper presents the analysis and design of a new ac-ac resonant converter applied to domestic induction heating. The proposed topology, based on the half-bridge series resonant inverter, uses only two diodes to rectify the mains voltage. The proposed converter can operate with zero-voltage switching during both switch-on and switch-off transitions. Moreover, this topology doubles the output voltage, and therefore, the current in the load is reduced for the same output power. As a consequence, the converter efficiency is significantly improved. The analytical and simulation results have been verified by means of a 3600-W induction heating prototype. An efficiency study has been carried out, obtaining values higher than 96%.

High Efficiency AC–AC Power Electronic Converter Applied to Domestic Induction Heating

This paper proposes a multiple-input versatile matrix converter (VMC) for integrating hybrid ac/dc energy resources and storages to the power grid. The VMC is developed from the traditional indirect matrix converter but operates in the reverse-boost mode rather than in the forward-buck mode. The reverse-boost mode is more relevant here since most renewable sources and energy storages have lower voltages than the grid. The eventual VMC developed uses an alternative nine-switch converter, rather than usual six-switch voltage-source converter, for providing six input terminals in total. One three-phase ac source and three dc sources, or other source combinations, can therefore be connected to the VMC. Powers from these sources are channeled to the three-phase utility grid through the VMC's current-source inverter. Their proper dispatches are guaranteed by the proposed control and modulation schemes, which also help maintain near-sinusoidal input and output current waveforms. Mathematical proofs, simulation, and experimental results have shown that the VMC can indeed operate as intended.

A Direct Power Conversion Topology for Grid Integration of Hybrid AC/DC Energy Resources

Domestic induction appliances require power converters that feature high efficiency and accurate power control in a wide range of operating conditions. To achieve this modulation techniques play a key role to optimize the power converter operation. In this paper, a series resonant inverter featuring reverse-blocking insulated gate bipolar transistors and an optimized modulation technique are proposed. An analytical study of the converter operation is performed, and the main simulation results are shown. The proposed topology reduces both conduction and switching losses, increasing significantly the power converter efficiency. Moreover, the proposed modulation technique achieves linear output power control, improving the final appliance performance. The results derived from this analysis are tested by means of an experimental prototype, verifying the feasibility of the proposed converter and modulation technique.

Modulation Scheme for Improved Operation of an RB-IGBT-Based Resonant Inverter Applied to Domestic Induction Heating

The topology and control method of indirect matrix converter (IMC) is discussed in the paper. The space vector pulse width modulation (SVPWM) is employed on both of the rectifier stag and the inerter stage. The adjustment method of input power factor is presented based on the input current SVPWM of the rectifier stage. According to the polarity requirement of dc-link voltage, the regulation range of input power factor angle is determined. In addition, the influence of input LC filter on input power factor is analyzed. The calculation formula of input power factor angle at the grid side is presented. Simulation and experimental results validate the theoretical analysis.

Analysis and control of input power factor in indirect matrix converter

Compared with conventional direct matrix converter, two-stage matrix converter has similar input/output characteristic. Furthermore, two-stage matrix converter can be implemented and controlled much easier since it has a practical DC-link. RB-IGBT is employed to construct bi-directional switches in two-stage matrix converter, which reduces on-state voltage drop and power loss of the converter. In this paper, a gate drive circuit for RB-IGBT with short-circuit protection based on integrated chip EXB841 is proposed. Experimental results validate the good performance of the proposed circuit in terms of switching test, fault under load test and hard switching fault test. The proposed gate drive circuit has been applied to drive the RB-IGBT bi-directional switches in the rectifier stage of two-stage matrix converter. The implementation of 10 kW two-stage matrix converter prototype using RB-IGBT is presented, and the experimental results on the rectifier stage of two-stage matrix converter using RB-IGBT is shown to test the proposed gate drive circuit.

RB-IGBT gate drive circuit and its application in two-stage matrix converter

Compared with conventional direct matrix converter, two-stage matrix converter has similar input/output characteristic. Furthermore, two-stage matrix converter can be implemented and controlled much easier since it has a practical dc-link. RB-IGBT is employed to construct bi-directional switches in two-stage matrix converter, which reduces on-state voltage drop and power loss of the converter. In this paper, a gate drive circuit for RB-IGBT with short-circuit protection based on integrated chip EXB841 is proposed. Experimental results validate the good performance of the proposed circuit in terms of switching test, fault under load test and hard switching fault test. The proposed gate drive circuit has been applied to drive the RB-IGBT bi-directional switches in the rectifier stage of two-stage matrix converter. The implementation of 10kW two-stage matrix converter prototype using RB-IGBT is presented, and the experimental results on the rectifier stage of two-stage matrix converter using RB-IGBT is shown to test the proposed gate drive circuit.

This paper proposes a novel algorithm for two-stage matrix converter to implement space vector pulse width modulation (SVPWM). Since the two-stage matrix converter has an intermediate dc link, the control process can be decoupled into rectifier stage modulation and inverter stage modulation. Conventionally, PWM algorithm for the rectifier stage is based on two larger source line voltages without zero vectors, which causes the distorted input currents. In this paper, in order to improve the power quality of two-stage matrix converter at input side, SVPWM for input current is applied on the rectifier stage, while the inverter and motor can be seen as constant current load in DC link. And SVPWM for output voltage is applied on the inverter stage. A novel algorithm is proposed to realize the PWM sequence of two-stage matrix converter. The modulation processes of rectifier stage and inverter stage are considered simultaneously and a two-step commutation of zero current switching in rectifier is achieved. Experimental tests have been conducted on a RB-IGBT based two-stage matrix converter prototype. The results verify the good performance of the proposed PWM algorithm with improved input currents.

A novel algorithm for space vector modulated two-stage matrix converter

Indirect matrix converter (IMC) fed interior permanent magnet synchronous motor (IPMSM) drive is a novel solution for AC adjustable-speed drives with high performance and high efficiency. Position sensorless vector control technique is applied for the IMC fed IPMSM drive. Model reference adaptive system (MRAS) based rotor position estimation method is employed to estimate rotor position and speed. An anti-overflow algorithm is proposed to avoid the data overflow in the digital implementation of sensorless control. Simulations using MATLAB verify the effectiveness of the developed control methods. Some experimental results validate the practical feasibility of this drive system.

Gang Li

Papers

Analysis and control of input power factor in indirect matrix converter

RB-IGBT gate drive circuit and its application in two-stage matrix converter

RB-IGBT gate drive circuit and its application in two-stage matrix converter

A novel algorithm for space vector modulated two-stage matrix converter

High performance vector control of IPMSM drive fed by indirect matrix converter