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An effective output voltage regulation method using harmonic burst mode control strategy is presented. By using this strategy, the operating performance of the full-bridge series resonant dc-dc converter (SRC) applied to electric vehicle (EV) battery charging is improved. The proposed control strategy not only performs load regulation, but it also achieves soft switch both at turn-on and turn-off...
In open-end winding AC motor drives, terminals of stator phases are normally connected between two inverters, normally, of the same type and size. In the present paper, an alternative configuration is studied where the machine is supplied exploiting two different converters: a main multi-level inverter and an auxiliary two-level inverter. The last operates as active power filter in order to eliminate...
The discontinuous current mode (DCM) flyback power factor correction (PFC) converter features zero-current turn-on for the switch, no reverse recovery in the secondary diode and constant frequency operation. However, due to DCM, the energy transfer does not cover the whole switching cycle, the peak and RMS values of the inductor current are large, which also occurs to the switch and diode. This increases...
This paper presents H-bridge converter which is bridgeless boost converter with sinusoidal pulse width modulation to improve the quality of utility mains ac supply. Due to nonlinear loads and common mode voltage harmonics are produced on the supply side which can be reduced using sinusoidal pulse width modulation technique for H-bridge converter. To reduce the common mode noise currents the grounds...
There are several Multilevel inverter topology emerge in new era. But several are complex in nature as number of level increases, hence for medium and low power conversion and to reduce complexity of the circuitry, interfacing of Buck Converter and simple H-bridge two level inverter is proposed with great flexibility of control and design, also less complex as level increases. By using appropriate...
Model-based control of converter-connected assets is an option to establish excellent dynamics. Such a control strongly relies on the quality of the model used. In case of power-electronic converters, blanking-time effects introduces a large voltage error, especially at low output voltage. Blanking-time effects depend on the sign (and, to a lesser degree, on the magnitude) of the current flowing in...
The number of distributed energy resources are increasing in modern power systems. Vehicle-to-grid power transfer is envisioned to become another type of distributed energy resource and support energy needs of the grid under various circumstances. This paper investigates the stability and power quality of a parallel grid-connected inverter system for vehicle-to-grid application using modeling and...
Modulation methods can significantly influence the performance of the converter in steady state, which is therefore very important. With different objectives like the minimum current ripple, minimum power loss or maximum DC link voltage utilization, SVPWM or DPWM are normally applied. With the SVPWM or DPWM proposed in literatures, the generation of the references is phase voltage based. But the phase...
This paper presents a division-summation (D-Σ) digital control applied to a three-phase active power filter (APF) with a three-leg inverter. The three-leg inverter shapes the source current sinusoidally by injecting harmonic currents to compensate the load current. The proposed D-Σ digital control approach summarizes the inductor-current variations over one switching cycle to derive control laws directly,...
In this paper an active power filter is presented based on a multilevel converter. The active power filter is intended to be used in domestic applications where reactive power compensation in two-phase networks is required. An innovative technique to balance the DC bus voltages of the power converter capacitors is proposed and also an estimation algorithm for those voltages is developed, allowing...
In this paper, Grey Wolf Optimizer (GWO) algorithm is applied to determine optimum switching angles for cascaded multilevel inverter of eliminating some high order harmonics while maintaining the required fundamental voltage. As case study in this paper, 11-level and 15-level inverter are considered and the optimum switching angles are calculated off-line to eliminate the 5th, 7th, 11th, 13th harmonics...
Direct power control (DPC) attracted wide attention due to its advantages of simple structure, quick response, strong robustness and elimination of current regulation/PWM blocks. However, conventional table-based DPC cannot work well when grid voltage is unbalanced. This paper proposes an improved DPC by using a new definition of instantaneous reactive power. As a result, the distortion in grid current...
This study deals with a control system for voltage regulation of stand-alone generation systems based on self-excited induction generators (SEIG). It is considered a four-wire hybrid topology composed by switchable capacitor banks and distribution static compensator (DSTATCOM). While the switchable capacitor banks supply the most part of the reactive power for voltage regulation, the DSTATCOM is controlled...
More recently, a completely different and a promising PWM switching method, based on wavelet modulation (WM) has been reported for single phase inverters. The WM scheme has been tested with single-phase inverters; higher magnitudes of fundamental components and lower harmonic contents than those from the conventional PWM and Random PWM inverters are reported. However, a major problem with WM scheme,...
Power electronics converters represent an interesting class of switched systems. They can be assumed to consist of linear elements, external sources, and electronic devices such as diodes and electronic switches. The behavior of the converter is obtained by the commutations of the electronic devices which determine the switchings among the different converter modes. In general it is difficult to know...
Recent tools for control and analysis of hybrid systems are applied to an AC-DC converter. The topology poses particularly challenging problems since it is unusually complex and the circuit parameters are such that the dynamic coupling between the AC and DC sides cannot be ignored. The paper proposes a model predictive control scheme for direct voltage control which circumvents the bandwidth limitations...
An operational analysis of a multilevel active front end rectifier, which has the mitigating capability of the current harmonics generated by the nonlinear loads connected to the same power distribution bus would be presented in this paper. Undesirable conditions in the power network such as voltage unbalances and spikes can affect negatively on the operation of very sensitive electric devices. Thus...
Generally, selective harmonic elimination (SHE) complexity for multilevel converters increases with the increase in number of levels. In this paper, an approach for multilevel converters' SHE is introduced. This approach is based on cancelling the 5th and 7th order harmonics irrelevant of the number of levels in three-phase cascaded-type multilevel converters with unequal DC sources, such that the...
Flying capacitor multicell (FCM) converter is one of the well-known breeds of multilevel converters. There are several configurations of flying-capacitor-based converters presented and reviewed in the literature. One of the promising topologies of the FCM converter suitable for single/threephase applications requiring isolated converters is H-Bridge (Full-Bridge) FCM converter wherein two FCM converters...
This paper provides general solutions for nonlinear transcendental equations to determine the feasible switching angles for a fundamental frequency-switching-scheme modulated cascaded multicell multilevel power converter with a higher number of modules (H-bridges) and output voltage levels in order to eliminate the dominant low-order line-to-line voltage harmonics. Afterwards, for each cascaded multilevel...
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