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In order to simplify the configuration of photovoltaic (PV) grid-connection system, this paper proposes to adopt a buck-boost dc-dc converter, and then develops a single-phase inverter via the connection with an H-bridge unfolding circuit with line-commutated. Depending on the conditions of dc input-voltage and ac output-voltage, the proposed circuit can work functionally as either a step-down or...
This study presents design of D-Σ digital controlled hybrid-frequency inverters with LCL filter for grid-connected applications. Hybrid-frequency inverters consist of inverters with different frequencies and power ratings connected in parallel. The lower frequency inverter has higher power rating, while the higher frequency inverter has lower one. The inverters are controlled to cancel out low-frequency...
This paper presents a harmonic study of different parallel photovoltaic (PV) systems connected to a low voltage distribution network to identify potential resonance between PV inverters and system impedance. LCL filters are commonly employed in PV inverters and recommended by IEEE 929–2000. These filters, however, by interacting with each other as well as with the system, may generate multiple harmonic...
A DC-DC converter for high-power battery chargers with the power-capacity over 6.6-kW for electric vehicle (EV) is proposed in this paper. Due to a new architecture, the proposed converter achieves the reduction of conduction loss at the primary-side by as much as 50% and has many benefits such as reduced circulating current, less duty-cycle loss, and lower secondary-voltage stress. In addition, its...
State-of-the-art high power density AC/DC and DC/AC converter systems typically employ Triangular Current Mode (TCM) modulation or conventional PWM. TCM is characterized by a wide variation of switching frequency over the mains period and ensures soft-switching in all operating points, but results in increased conduction and high-frequency losses due to the necessary large current ripple. In contrast,...
In this paper, a transformerless photovoltaic (PV) power conditioning system (PCS) based on the AC/DC boost inverter is proposed, which is capable of solving leakage currents and second-order power ripple issues. In this topology, the leakage current is reduced significantly since most of common-mode currents flow through the output capacitor instead of parasitic capacitors and grounding resistor...
Recently, the use of induction-heating systems has increased, and wireless power transmission systems for electrical vehicles have also been launched. These applications are designed to operate under 100 kHz and close to electrical equipment or the human body. Therefore, it is important to discuss the effects of alternating magnetic fields and evaluate the electromagnetic interference to other equipment...
This paper presents the dimensioning as well as the comparison of common compensation topologies for inductive power transfer (IPT) systems. A compensation is needed on the primary as well as the secondary side. It consists of a capacitor (parallel or series) in the simplest case or a combination of reactive components (like LCC). This work is the first compilation of the dimensioning, considering...
A novel solution of a single-stage buck-boost inverter with unfolding circuit at the output stage is presented. The inverter has a wide range of input voltage regulation, minimum passive components and a very flexible control structure. It can be applied for renewable energy systems where high power density is required. Our simulation results confirmed all theoretical statements.
With the electric vehicle drive system running electromagnetic compatibility problems become more and more serious, how to effectively suppress the conducted interference problem has become a technical problem. In this paper, the mechanism and the coupling path of conducted EMI in EV drive system are analyzed, and the suppression effect of electromagnetic interference is discussed from the aspect...
This paper presents a filter-based control scheme for an H-Bridge inverter with output LC filter. This approach relies only on a single output voltage measurement to reduce the system cost as well as measurement noise and disturbance injected by output current and/or inductor current measurements. To reduce the controller sensitivity to the system parameters, the proposed controller is developed for...
DC-DC converter reliability is of primary interest due to their key role in electronic systems. This paper proposes a diagnostic algorithm, which can be easily implemented in digital programmable device for MOSFET fault detection and identification. An improvement over the existing technique is presented, and its rapid fault detection capability is demonstrated. The two basic faults, namely the short...
This paper presents mainly on the basis of open loop L-Z source inverter. By using the power electronics converter the distributed generating system is connected to the grid. In that by adding inductance and diode to the input side of power electronic converter the input voltage to be boosted and eliminates the ripples in the input current and reduce the inrush current. In the distributed generating...
This paper presents a comparative analysis of different shoot through control schemes employed in Z-source inverters. Z-source inverter provides a single stage power conversion topology which can give both voltage buck and boost properties. This paper also gives an insight on the working of Z-source inverter by utilization of shoot through forbidden states. These states are utilized by implementing...
This paper presents an on-grid photovoltaic (PV) in a micogrid which is including a PV array, a boost converter, an inverter and an LC filter. The main challenge of designing the proposed system is the ability to combine the power electronic converters with the corresponding control method to achieve best performance. In this paper, a voltage-current mode controller is proposed to adjust both the...
The boost inverter is an attractive solution for photovoltaic (PV) microinverters since it is a single stage architecture. Indeed, in comparison, most of the microinverters topologies consist of two-stage structures, a DC-DC converter for voltage elevation and an inverter for grid connection, resulting in a lower efficiency. The boost inverter consists of two DC-DC boost converters connected in differential...
This paper proposes a single-phase bridge inverter with both voltage-boosting and power decoupling capabilities. The proposed inverter topology diverts the second-order ripple power into a small film capacitor instead of using a bulky electrolytic capacitor at the DC side, thus eliminating the large electrolytic capacitor that has a short lifetime. The voltage across the decoupling capacitor is controlled...
Photovoltaic energy has gained prominence in the current context of energy generation. The fundamental element of a photovoltaic system connected to the electric grid is the electronic converter. In order to be marketed, electronic converters must be tested and certified in accordance with current standards. In the certification process, an equipment known as a solar array simulator (SAS) is used...
This paper presents a grid-connected mono-phase PV system. The electronic processing of the photovoltaic array energy was managed by a dual-stage inverter through high-frequency galvanic isolation. The DC-DC three-phase Series Resonant Converter works with switching frequencies equal to the resonant frequency. The main objective of the DC-DC converter is providing a bus with an equally divided voltage...
An autonomous DC microgrid system that uses a triple active bridge converter as a power routing unit is proposed. A control system that can independently manage the transmission power between each port is needed to construct the microgrid. This paper describes how the decoupling power flow control system is implemented in the prototype triple active bridge (TAB) converter rated at 400 V, 10 kW, and...
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