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In the previous research, the fast P control method is proposed. In this method, the PID control part is divided into the P control and I-D control parts. The high speed-low resolution A-D converter and low speed-high resolution A-D converter are required for the P control and I-D control, respectively. These two A-D converters are lower cost than the high-speed and high-resolution A-D converter....
This paper proposed a single-phase three-level inverter that has constant voltage constant frequency (CVCF) operation system. Harmonic analyses with linear and nonlinear loads have been realized to measure the robustness of the proposed technique. It has been shown that the proposed technique has 15% less harmonic distortion and better performance than the conventional inverter for the same load and...
Multilevel inverters are emerging as a new breed of power converter options for power system applications. Recent advances in power switching devices enabled the suitability of multilevel inverters for high voltage and high power applications because they are connecting several devices in series without the need of component matching. Usually, a transformerless battery energy storage system based...
This paper describes a simple grid current control method for the grid-connected operation, and inverter voltage control method based on the phase locked loop (PLL) for the intentional islanding operation at the three-phase grid-connected inverter. The PLL controller based on the pq theory with a simple P-controller is used to synchronize the phase of inverter output voltage with a grid voltage at...
The paper investigates the use of multilevel cascaded Z source inverter (MC-ZSI) for photovoltaic (PV) power generation system. The control of the proposed system will take into account the multilevel modulation scheme and the independent control of the shoot-through duty ratio of the connected Z source inverters (ZSI). In three phase three cells inverter, there exist nine independent shoot-through...
An alternating-current light-emitting diode (AC-LED) driver is implemented between the grid and lamp to eliminate the disadvantages of a directly grid-tied AC-LED lamp. In order to highlight the benefits of AC-LED technology, a single-stage converter with few components is adopted. A high power-factor (PF) single-stage bridgeless AC/AC converter is proposed with higher efficiency, greater power factor,...
In this paper, an optimal converter drive method for Permanent Magnet Synchronous Motor (PMSM) with a 3-level inverter is discussed in terms of loss minimization. The 3-level inverter can change an operation mode between two modulations namely, PWM and 1'pulse modulation at a decided point. In this paper, we discuss the interchange point for the two modulations subject to the total loss of PMSM drive...
Battery energy storage systems (BESS) become increasingly more important due to the impact of volatile energy sources on the power supply and present a good solution for buffering the power imbalances in the electric grid. Particularly with regard to a future scenario with electrical energy, means have to be taken to ensure a stable and reliable power supply. Redundant BESS allow normal operation,...
Permanent magnet synchronous generator (PMSG) is often linked to a PWM rectifier in order to provide a dc power supply. When such a system is used for variable speed applications, it is desirable to extend the operation speed range. Since the induced voltage of the PMSG increases with the speed, it is proposed in this paper to utilize flux weakening control to restrict the PMSG output voltage at high...
This paper presents a pulse-width modulation (PWM) strategy of single-phase to three-phase matrix converters for reducing output voltage harmonics and number of commutations. The authors have already proposed a PWM strategy to decrease the number of commutations to four in all three phases during one control period. This paper describes a procedure for further reducing number of commutations to three...
A new prototype of a secondary-side phase shifted (SPS) soft switching PWM dc-dc converter suitable for electric vehicle (EV) battery charging systems is presented in this paper. In the proposed dc-dc converter, soft switching commutations are achievable from full load to no load by utilizing parasitic inductances of the high frequency (HF) transformer. Beside that, no circulating current in both...
Authors has proposed a new method to decrease high-frequency noise at specific frequency band with modification of switching transient slope. In this paper, new voltage feedback type VDS controller (gate driver) has proposed to realize modified switching transient to increase stability. In the step-down converter applied propose VDS controller, harmonics reduction effect is obtained about 10 dB in...
This paper presents a newly-developed soft switching PWM boost dc-dc converter in continuous conduction mode (CCM). The soft switching boost dc-dc converter consists of an edge-resonant switched capacitor (ER-SWC) cell, providing the wide-range soft commutations for all the switching power devices. The voltage stress inherent to the CCM scheme can be reduced by employing a lossless auxiliary circuit...
This paper proposes an optimum PWM method which reduces switching losses of a three-level NPC inverter most effectively by the two-phase modulation method. It selects the optimum one which minimizes a new switching (SW) loss estimation based on reduction effects in switching times considering phase currents among multiple reduction patterns. The proposed method was experimentally verified to select...
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