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A control system for a DC-DC boost converter based on a deadbeat controller providing a finite duration transient in a small neighborhood of the equilibrium state is proposed. Deadbeat control is implemented by reducing a system matrix to the Frobenius form without transformation of state variables. A procedure to obtain deadbeat controller parameters for DC-DC boost converter is stated. Mathematical...
A multiple drives solar-pumping system is presented in this paper. The system is based on a singlestage photovoltaic (PV) topology where an array of solar panels is connected to multiple inverters supplying equal centrifugal pumps. The inverters are operated to obtain maximum power from the PV system and a standard indirect vector control strategy is used to regulate the machines currents. Moreover...
Recently, the demand of the position sensorless control is increasing in motor drive. At low speed range, the saliency-based methods are proposed. In this paper, using the modified symmetrical carrier PWM with switching frequencies up to 16kHz, we achieve to reduce the audible noise that human can be heard.
The proposed control method for dual converters combines two approaches as space vector PWM (SVPWM) and finite control set model predictive control (FCS-MPC). The SVPWM is used for suitable output voltage vectors preselection and the FCS-MPC enables using a mathematical model of the system and a proposed cost function to reduce power losses and to redistribute power losses among transistors. The suitable...
Motor current measurement techniques as well as predictive control algorithms for electric drives rely on an assumption of linear motor currents changes resulting from constant inverter output voltages. Recent research has reported that this assumption does not hold in motors with short electrical time constant, and in drives whose rotor position advances substantially during a control period. This...
The impact of capacitor voltage changes during the modulation period is examined in order to improve the arm voltage of a modular multilevel converter. Different methods are used to predict and compensate for the capacitor voltage change and the resulting arm voltage error, whereby two of the improvements provide a possibility to easily upgrade existing modulation algorithms. Simulation and measurement...
This paper will present different modulation schemes for optimizing the efficiency of low-voltage traction drives. The converter of the vehicle automatically has to select the most suitable modulation or control scheme depending on the present operating point in order to maximize the efficiency of the complete drive train. Furthermore, the functional principles and algorithms of the individual modulation...
The output torque of switched reluctance motor (SRM) can be controlled by flowing an appropriate current through the armature windings. In general, current hysteresis control has been applied. However, there is a problem that acoustic noise generated from the SRM at the driving tends to become large. Then, there are reports that PWM control has been applied to suppress the acoustic noise. This paper...
Modular Multilevel Converter (MMC) has served as a promising Voltage Source Converter (VSC) for High Voltage Direct Current (HVDC) applications. In this paper, a new MMC Submodule (SM) topology called Modified Switched Capacitor Sub-Module (MSCSM) is proposed. The MSCSM is able to block the DC fault using the power electronics semiconductor diodes due to its intelligent configuration without the need...
A single phase transformer-less inverter is introduced in this paper. The negative polarities of the input voltage and output terminal have common ground. Therefore, the leakage current problem that is common in PV systems is eliminated naturally. In addition, the proposed inverter has fewer components compared with its counterparts and only one switch conducts during the active states which enhance...
A control algorithm for an integrated power factor correction (PFC) and series resonant converter (SRC) using only two switches is presented, allowing to open loop control the AC input current and the DC output current independently. The theory for this approach is analyzed in time domain and a novel approach for open loop regulation is presented and verified. The software defined power (SDF) control...
In this paper a control scheme for a PMSM drive that keeps the torque ripple within predefined limits is presented. The electromagnetic torque is assumed to be proportional to i1q, which is measured by using Sigma-Delta Analog to Digital Converters (ΣΔ-ADCs) with a very high sampling rate, so the actual ripple of the torque can be obtained and controlled in an enhanced way. The measurement results...
A dual active bridge (DAB) dc-dc converter has a limited soft-switching range and high circulating current with the conventional phase shift modulation (PSM) when a voltage variation occurs in the input/output voltage. To overcome these issues, single pulse-width modulation (SPWM) and dual pulse-width modulation (DPWM) were proposed and combined into one modulation strategy called combined pulse-width...
In this paper, a self-adaptive resonance frequency tracking method is presented. The resonance frequency tracking is used in a LCL-filter-based active power filter to adapt the frequency of the notch filter applied for active resonance damping. By determining the resonance frequency of the LCL-filter and adapting the notch filter frequency, the bandwidth of the notch filter can be decreased, whereby...
Recently, modular multilevel conterters (MMC) are also considered for medium voltage (MV) applications, where the number of modules and the switching frequency are relatively low compared to high voltage (HV) applications. In this context, standard modulation methods can cause relatively large output voltage errors. This effect is amplified even more, if the value of the module capacitances is decreased...
This paper presents a new mathematical model and a PWM switching technique for a three-phase grid-tie bidirectional DC-AC converter. The converter topology is designed based on linking an H-bridge to a three-to-single-phase matrix converter through a single-phase high-frequency transformer. The proposed mathematical model uses the trapezoidal waveform approximation for the high-frequency current waveform...
In this paper, a drive scheme generating 24-sided polygonal voltage space vector structure using an inverter topology with single DC source is proposed. A 24-sided structure eliminates dominant low order phase voltage harmonics including and up to seventeenth and nineteenth orders throughout the speed range including step operation. The power circuit has a two-level inverter and two low voltage cascaded...
The paper objective is to propose an innovative power converter topology combining the advantages of capacitor discharge and switch-mode converters to generate half sinusoidal fast current pulses with high precision. The capacitor discharge operation mode of the converter allows the generation of current pulses with fast transient response and the switch-mode operation enables the control of the pulse...
The objective of this project is the performance optimization of an electrical drive system, which consists of a two-level Voltage Source Inverter (VSI) and a Permanent Magnet Synchronous Motor (PMSM) with high magnetic anisotropy. To this end, the concept of Synchronous Optimal Modulation (SOPWM) is employed for inverter control and the optimal inverter switching angles are defined for an isotropic...
Electrical insulation materials quality and reliability play a central role in providing the electrical machines reliable operation. It is well recognized that insulating system of low voltage motor fed by converter is exposed to electrical stresses arising from repetitive square waveform of supplying voltage while additional impact of temperature, vibrations and environmental operation conditions...
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