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The DC/AC inverters are the key elements in grid-connected PV energy production systems. In this paper, new design optimization techniques focused on transformerless (very high efficiency) PV inverters are proposed. They have been developed based on an analysis of the deficiencies of the current, state-of-the-art PV inverters design technology, which limits the amount of PV energy supplied into the...
This paper presents a new micro-inverter topology that is intended for single-phase grid-connected PV systems. The features of the proposed topology are: (1) eliminating the double-frequency power ripple using small film capacitor; (2) improving the maximum-power-point tracking (MPPT) performance; (3) using long life-time film capacitors, which will improve the reliability of the inverter; and (4)...
SiC-JFET based inverters can achieve very fast switching, hence reducing the commutation losses, at the cost of increased Electro-Magnetic Interferences (EMI). To keep the EMI conducted emissions within reasonable limits, we propose to integrate some small-values capacitors directly into the power module. Common Mode (CM) is investigated and compared with a standard configuration. The high frequency...
Based on the inherent property of three phase AC power supply, the present scheme of the three phase rectifier utilizes auxiliary blocked phase selection and boost-buck circuits by processing only 22% amount of the power to patch the gaps of the input current waveforms of the main rectifier. That only one current loop of the three-phase inputs is regulated and one is left as low resistance state makes...
In this paper, a novel active clamp Flyback-Forward converter is proposed for large voltage gain and high power applications. The interleaved configuration on the primary side is employed to handle the large input current. An improved voltage doubler configuration is adopted on the secondary side to make the output diodes sustain only half of the high output voltage. Furthermore, the output diode...
In the transformerless photovoltaic (PV) system, the common mode ground leakage current may appear due to the galvanic connection between the PV array and the ground, which causes the safety issues and reduces the efficiency. To solve this problem, a novel inverter topology with switched capacitors is proposed in this paper. By connecting one pole of the PV cell directly to the neutral line of the...
This paper proposes a novel series-connected, self-reconfigurable, multicell battery design. A new cell switching circuit topology is proposed and implemented by using high-efficiency semiconductor devices for dynamic configuration of the multicell battery. Each cell in the battery only uses two switches to fully control its operation independently. The proposed design can maximally utilize the battery's...
Critical Conduction Mode (CRM) Flyback APFCs is widely used in High Brightness Light Emitting Diodes (HB-LEDs) driver. But with high input voltage or light load, its line current distortion deteriorates because of the peak distortion. In this paper, an improved control strategy is introduced to solve this problem. It is realized by the injection of sin2θ component to primary reference current. Nonetheless,...
Single Boost converter has several limitations in driving a long LED string although it can have perfect current match between each LED. Extreme duty cycle and low efficiency are the two major drawbacks. In this paper, a high efficiency step-up DC-DC converter with high voltage gain for LED backlighting applications is proposed. Without using a transformer, a multi-modes charge-pump is cascaded with...
A photovoltaic panel fitted with a large collection of low-power inverters integrated at the level of individual solar cells is used to design an ac module. To facilitate dc-ac power conversion, the inverter aggregate is controlled using interleaved carrier pulse width modulation. Every solar cell operates at its maximum power point even when the photovoltaic panel is partially shaded. Additionally,...
This paper presents a new parameter identification method designed for single-phase induction machines (SPIM), and applicable in general to symmetric and non-symmetric two-phase machines. The approach is based on a state-space model, as opposed to the more commonly used equivalent-circuit model. Two frequency response functions are identified as a function of these state-space parameters. One frequency...
This paper presents a high-frequency transformer link single-phase inverter system using a series resonant soft-switching scheme applied to photovoltaic AC modules. The proposed high-frequency transformer link inverter circuit consists of a full-bridge inverter, a series resonant circuit, an isolation transformer with center tap winding in secondary side and low-frequency distribution switches synchronized...
A fault-tolerant technique valid for both open-loop and vector-control motor-drive systems is introduced in this paper. The technique is merely presented for AC motors with Delta-connected circuits in their stator windings. Hence, it enables the operation of the three phase motor upon a failure in one of its phases without the need of a special fault detection algorithm. This technique is to significantly...
This paper presents an efficient, low-cost, versatile LED-based light simulator intended to produce a well-characterized spectrum for tests of solar cells and other photosensitive devices. Three major design aspects are addressed: LED spectra, power converters for LED drive, and control. Visible light emulating a standard solar spectrum is used as a test application using six LED colors. The number...
A high step-up current fed multi-resonant converter (CFMRC) has been proposed recently for renewable energy harvesting where the sustainable power sources such as PV panels and fuel cells are characterized by low-voltage, high-current output. An output voltage doubler is applied to the previously proposed CFMRC for the purpose of reducing the turns-ratio of the transformer. Compared to the CFMRC with...
Previous works on interleaved operation of switching power converters are based on the assumption that natural-sampling pulsewidth modulation (PWM) is used. Various interleaving strategies have been reported to minimize EMI filtering requirements, eliminate system resonance at certain frequencies, or minimize total harmonic current distortion through optimization of the interleaving phase shift angles...
The compensator design is closely related to the transient response achieved by the closed loop converter. So, the representation of the aforementioned transient response while designing the compensator is a powerful optimization tool. However, in order to represent the transient response, the small signal model of the power stage must be completely characterized. When the power stage is not determined...
An optocouplerless two-stage high power factor LED driver is proposed in this paper. The first stage is an optocouplerless isolated PFC converter and the second stage is a constant-current controlled non-isolated DC/DC LED driver. Optocoupler and secondary amplifier circuit of the first PFC stage can be removed. Besides, the output capacitor s of the PFC stage can be reduced due to low output ripple...
Power electronics control algorithms are relying increasingly on digital discrete-time implementation of basic blocks for development of power electronics applications. Flexible reconfigurable blocks capable of handling these algorithms in realtime is necessary. This paper discusses the effect of hardware-software partition and hardware accelerators on performance of basic modules. It is concerned...
This paper proposes the stability control method for the input current of the matrix converter considering the synchronous reactance of a generator and a motor drive. When the stability control uses the input current feedback with a vector control for the generator side, the oscillation in the input filter can be suppressed. However, the output current oscillation occurs when the high response output...
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