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This paper proposes a control method to expand a fault-ride-through (FRT) operation range for a grid-tied matrix converter. In the conventional method, the generator current is limited because the q-axis current is only controlled whereas the d-axis current is kept to zero. Consequently, the matrix converter cannot satisfy the FRT requirements for the grid reactive current due to the limitation of...
This paper presents a hybrid six-step operation, which utilizes both a pulse width modulation (PWM) and a conventional six-step operation of a matrix converter in order to reduce switching losses during the standby time of flywheel. In the hybrid six-step operation, a virtual AC-DC-AC conversion is applied in order to separate the control of the matrix converter into a current source rectifier (CSR)...
This paper proposes a halt sequence for a matrix converter to overcome the overvoltage and overcurrent problems in the case of grid faults in regeneration. The proposed halt sequence short-circuits PMSM to avoid the regenerating current which flows into the snubber capacitor. The proposed method consists of two sequences; Sequence I controls the q-axis current to reach zero and PMSM becomes in the...
This paper presents a matrix converter design for achieving maximum power density using a SiC device based on a front-loading design. To design the matrix converter to achieve maximum power density, the conduction loss and the switching loss of the matrix converter are theoretically derived and validated by simulation and experiment. Based on these formulas, the relationship between the efficiency...
This paper discuses soft-switching range in an isolated single-phase matrix converter with a center-tapped transformer for HVDC (high voltage direct current) power feeding systems. The proposed converter consist of a full bridge inverter, a high frequency transformer and a matrix converter which it does not require a bulky electrolytic capacitor. The power decoupling operation is accomplished by the...
This paper proposes a FRT (Fault ride through) method of a matrix converter under three-phase short voltage sag. The feature of the proposed method is to control grid reactive current and generator torque at the same time. In order to realize these capabilities, this paper describes a modulation method dividing a control period into 3 modes. The first mode is to turn off all switches and the second...
This paper discusses a bi-directional isolated single-phase matrix converter using center-tapped transformer, which has a power decoupling capability for battery energy storage systems for renewable energy sources such as PV and wind turbine systems. The proposed converter is comprised of a full bridge inverter, a high frequency transformer and a matrix converter in order to eliminate large DC-link...
This paper proposes a control method of a matrix converter in a micro grid system to obtain stable islanded operation. The islanded operation using a matrix converter needs a voltage feedback control to assume the matrix converter as a constant voltage power supply for the load. On the other hand, the islanded operation also requires a generator current control with a feedback to determine provided...
This paper presents an isolated type of single-phase matrix converter topology for PHV/EV on-board battery chargers. The proposed converter is comprised of a full bridge inverter, a high frequency transformer and a matrix converter. Due to the lack of DC link bus in matrix converter, in order to suppress the power fluctuation, a power decoupling method which only employs a center-tapped high frequency...
This paper discusses a direct grid connection system for the permanent magnet synchronous motor (PMSM). It is difficult to connect PMSM to the power grid directly due to the resonance between a synchronous reactance and the inertia moment. In order to solve this problem, the direct grid connection system which consists of an auxiliary inverter of small capacity and a matrix converter is proposed for...
This paper presents an isolated DC to single-phase AC converter using a matrix converter for HVDC (higher voltage direct current) power feeding system. The proposed converter comprises a full bridge inverter, a high frequency transformer and a matrix converter and does not use a bulky electrolytic capacitor. Then, in order to reduce a ripple component in a DC bus current caused by the single-phase...
This paper presents a design procedure for an output current control and an output damping control of a matrix converter to suppress LC filter resonance and improve transient current response. With a conventional design method which gives preference to stability, the output damping control causes a large output current overshoot and a control bandwidth of the output current is affected. Therefore,...
This paper discusses loss analysis formulas to achieve high efficiency and high power density for matrix converter. In this paper, the conduction loss and the switching loss of the matrix converter are derived theoretically based on virtual AC-DC-AC control method. Then, the validity of the equations is confirmed in simulation and experiment. From the experimental results, the maximum efficiency is...
This paper discusses and evaluates the performance of a 50-kVA three-phase AC to DC matrix converter. Comparing to the conventional converter, which consists of a PWM rectifier and an inverter, the matrix converter does not require a large reactor at the three-phase input side, and require no DC smoothing capacitor at the DC link part. A space vector modulation based on the virtual AC-DC-AC conversion...
This paper discusses an uninterrupted power supply (UPS) with a flywheel and a matrix converter using a direct grid connection. A flywheel type UPS has a problem where a standby power is bigger than that of the battery or EDLC type UPS. To solve this problem, an operation known as direct grid connection mode is proposed, where a matrix converter is the interface converter between the flywheel and...
This paper proposes a space vector modulation based on the virtual AC/DC/AC conversion method for a matrix converter to reduce the switching loss. The switching loss of the matrix converter is not decided by only the number of switching times but also depending on the voltage and current in the selected switching devices based on the modulation. The proposed method can minimize the maximum instantaneous...
This paper discusses an interface power converter between a power grid and an engine generator. A matrix converter, which is one of the AC/AC direct converters, can achieve high efficiency without large energy storages. Therefore, the volume of the converter becomes smaller and the reliability of the interface system is improved due to no use of electrolytic capacitor. This paper discusses the control...
This paper proposes a circuit topology for a matrix converter with a boost up function in the input side. The proposed circuit uses a V-connection AC chopper to achieve the boost-up function. The matrix converter and the V-connection AC chopper are independently controlled, where a virtual indirect control method is applied to the matrix converter, and the control of the V-connection AC chopper is...
This paper discusses a modulation control for an indirect matrix converter connects with a reactor free boost converter for induction motor drives. The square wave modulation is proposed to apply with a four-step commutation pattern to improve the voltage transfer ratio of the indirect matrix converter from 0.866 to 0.97 (VTR= vout/vin). Furthermore, a feed-forward control is proposed to apply in...
This paper discusses about characteristics of a matrix converter where a current feedback is applied to the input side. When the impedance of the power grid is high, such as a generator, the control stability of the matrix converter will be deteriorated. One of the solutions to this problem is to apply an input current stability control that is proposed. However, the efficiency of the generator will...
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