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This paper discusses pulse density modulation (PDM) control methods for a single-phase to three-phase matrix converter for high-frequency applications such as the grid interface converter for a wireless power transfer system and high-frequency transformer link system. The input frequency for this converter is assumed as several hundred kHz, and at the same time outputting a commercial frequency, i...
This paper proposes a new space vector pulse width modulation (SVPWM) strategy for a hybrid input switched multilevel converter. The converter topology is a cascaded connection of input switched and H-bridge converters, which can provide 2N+1 voltage levels for each phase. The proposed SVPWM strategy treats the multilevel converter as a two-level converter by introducing an offset vector. With generated...
Model Predictive Control (MPC) offers a variety of advantages compared to conventional control methods. The problem with MPC is the high computational cost and the associated long control cycle time. This makes MPC unattractive for processes with small time constants, as in permanent magnet synchronous motors with interior magnets (IPMSM) for electric vehicles. In this paper a Model Predictive Control...
The PRM which uses reluctance torque positively and reduced the amount of magnets relatively, and the industrial low-voltage inverter to which the PRM control function is applied has been developed. Though exact motor parameters may not be known, the inverter has a control method which on-site PMM control commissioning can be performed easily for such the case. The combination test of the PRM and...
The design of optimized modulation schemes at low pulse ratios, e.g. Selective Harmonic Elimination (SHE), has been widely studied. However, most previous work has focused on half-wave symmetry pulse patterns. For variable speed and variable torque applications, non-half-wave symmetry SHE modulators depending on the power factor angle still achieve highly efficient inverters in many power factors...
Open-end winding machine configuration provides better fault tolerance and flexibility for control compared with a conventional three-phase neutral connected electric motor. In this paper, three types of pulse width modulation (PWM) schemes - sinusoidal PWM, space vector PWM, and symmetrical sinusoidal PWM for open-end winding induction motor drives are being examined. The three PWM schemes are simulated...
This paper introduces a configurable three-phased inverter designed to demonstrate the basic operation and concepts of frequency inverters to electrical engineering and mechatronics students. The inverter consists of an FPGA-based space vector controller, a controller-based communication interface, and the actual power stage. Frequency inverters employing space vector controllers are usually complex...
Multi-level matrix converter (MMC) is a three phase ac-ac converter that can synthesize three or more levels at the output voltage while maintaining desired input power factor. In this paper a new converter, Capacitor clamped Multi-level Matrix converter (CMMC) has been proposed as an addition to the MMC family. In comparison to conventional matrix converter, the CMMC offers an additional level at...
Multi-MW wind power converter's reliability is a key issue for the whole wind power generation system. Due to wind power fluctuation, IGBT's handling power is fluctuating largely and rapidly, which will cause a large junction temperature variation of IGBT. Thermal stress is the main factor affecting IGBT's lifetime. In this paper, the adaptive thermal control is proposed to improve IGBT's lifetime...
This paper presents a novel auto-tuning method of inductances for permanent magnet synchronous motor (PMSM). In the proposed method, inductances are measured injecting high frequency current and voltage to the motor at standstill. On the basis of adaptive control, the current control executing inductance tuning is stable and highly accurate up to the high frequency area, though motor parameters are...
Droop based control schemes for power electronic converters have been object of extensive research in the last decade and have arguably become the most popular solution for converter control in microgrid applications. The protection from over-currents and over-voltages are critical features of control schemes for converters required to operate in both stand-alone and parallel-connected modes, but...
This paper introduces a new method of generator brake torque control during Fault Ride Through (FRT) drive for a multi level matrix converter of wind power system. It may be exist that a generator speed become over speed during FRT drive. In this case, a generator has to be fixed brake torque. In the past, generator brake torque control during FRT drive for a matrix converter is impossible. However,...
Overhead crane is widely used to convey the payload due to its convenience. However it is hard to control the crane because of its underactuated structure. The most important control requirement is to make the trolley position converge to target position accurately with suppressing payload sway. This makes it possible to achieve the purpose of overhead crane which is to convey payload to target position...
In this paper, a new design method of vibration suppression controller for multi-mass (especially, 2-mass) resonance systems is proposed. The controller consists of a digital modified-IPD controller for speed loop and a digital PI controller for current minor loop. The six controller gains are determined by Differential Evolution algorithm. The Differential Evolution is one of optimization techniques...
This paper presents a modified DTC-PWM scheme which uses 12-side sectors and 12 voltage vectors to reduce torque and flux ripple. In the proposed control scheme, three voltage vectors can be selected in a sector with the torque and flux error conditions. The 3 voltage vectors are set as big-small, medium-medium and small-big pairs of torque and flux component according to the sign of the torque and...
Electrical drives with open-end winding configurations offer certain advantages over drives with star-connected windings such as higher dc-link voltage utilization and lower inverter losses. However, there are a couple of drawbacks like circulating currents, diminishing the performance of the drive. This paper compares the performance of inverter and drive configurations with star-connected windings...
This paper presents a space vector modulation (SVM) technique for a three-level operation based on dual two-level voltage source inverter (VSI). This inverter topology uses two standard two-level VSI placed in parallel using a three-phase transformer to connect them together. This paper proposes a general modulation algorithm for dual two-level VSI based on the basic two-level SVM technique. The proposed...
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