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In this paper, a novel power electronic transformer (PET) structure for dc power distribution system is proposed. The proposed converter can achieve very high voltage conversion ratio with high frequency isolation and bidirectional energy flow, thus it can be used as the interface equipment of high voltage and low voltage dc power grid. Different from the conventional structure, only one high frequency...
This paper proposes a DC-AC conversion system adapted to an electric vehicle with fuel cell. This conversion chain consists of a fuel cell, a unidirectional converter, an isolated bidirectional converter, an inverter, and a second voltage source. Matlab-Simulink is used in order to verify the theoretical results.
This paper is concerned with the design of the power control system for a single-phase voltage source inverter feeding a parallel resonant induction heating load using shift-phase inverter control. The control of the inverter output current, meaning the active component of the current through the induction coil when the control frequency is equal or slightly exceeds the resonant frequency, is achieved...
Distributed generation and smart grid integration of renewable energy sources introduce a lot of challenges for the enabling power electronic converter technology. Some of these challenges include wide controllability range, high power handling and good reliability. Three-level boost converter is one of the attractive solution for applications requiring voltage cross regulation such as three-level...
A four switch, low power, battery integrated, photovoltaic stand-alone inverter system is proposed in this paper. The proposed topology is derived by combining a DC-DC bidirectional converter with a Ćuk based inverter. The derived topology has a simple structure consisting of four switching devices and an isolation transformer. A simple integrated control strategy for maximum power point tracking...
This paper proposes a control method to realize interior permanent magnet synchronous motor (IPMSM) drive system without using both an electrolytic capacitor and an line inductor. In general, an electrolytic capacitor-less inverter shows input current vibration in the source side if there is a line impedance on the source. This vibration is caused by resonance with the line impedance and the DC-link...
In this paper DC-AC differential inverters, which are capable of stepping-up the DC voltage in a single-stage, are studied. Due to the reduced number of devices, they are compact, efficient and low cost. Due to their unique characteristics, they can be used in many applications such as PV, UPS and fuel-cell. This paper introduces a new control method which utilizes a different set of voltage references...
A multilevel inverter with a H-bridge clamp circuit is proposed for single-phase three-wire (1P3W) utility connected applications such as PV systems. The proposed inverter consists of two n-level inverters and a H-bridge clamp circuit. The proposed inverter requires only 12 controllable switches to obtain a 5-level output voltage though conventional multi-level converters with grounded neutral point...
This paper presents an isolated DC to single-phase AC converter using a matrix converter for HVDC (higher voltage direct current) power feeding system. The proposed converter comprises a full bridge inverter, a high frequency transformer and a matrix converter and does not use a bulky electrolytic capacitor. Then, in order to reduce a ripple component in a DC bus current caused by the single-phase...
This paper presents a implementation of Z-source inverter system and speed control for induction motor drives. The Z-source inverter system is a single stage converter. By controlling the shoot-through duty cycle, the Z-source network can boost the capacitor DC voltage. Which is greater than the input DC voltage. As a result, the new Z-source inverter system provides ride-through capability during...
In electric vehicles abrupt torque steps and changing driving speeds require alternating currents and voltages. The battery voltage varies depending on the state of charge and on operation points. In order to keep the DC voltage of the Three-Level Inverter constant or conform it to the induced voltage of the electric machine (M) to reduce switching losses a DCDC converter is necessary. An alternative...
This paper presents a new photovoltaic (PV) micro-inverter topology. The topology is based on a partial power processing resonant front end dc-dc stage, followed by an interleaved inverter stage. The input stage provides high efficiency, and flexibility of design for wide input voltage range and the output stage provides an effective switching ripple of twice the PWM frequency, which reduces the output...
This paper introduces a high gain Single-Stage Boosting Inverter (SSBI). The proposed topology can be used for alternative energy generation and particularly in photovoltaic applications. As compared to the traditional two stage approach, SSBI has a simple topology, low decoupling capacitor and low component count. SSBI employs One Cycle Controller to generate its AC output and attain DC-AC power...
Hybrid PV-wind based stand-alone systems have evolved as a promising solution for rural deployment where access to electrification is not viable. The conventional approach for the integration of multiple renewable sources and energy storage elements involves using dedicated single-input converters for each source and requires more number of converter stages leading to considerable reduction in reliability...
This paper proposes a new high-efficiency and low-cost dc-to-ac power conversion circuit for installation on a low-voltage distribution system in which the s-phase terminal is grounded. The circuit consists of two half-bridge PWM inverters and a symmetric boost converter. The symmetric boost converter uses four IGBTs as the switching devices, and can independently boost the dc-link voltage up and...
A six-switch solid state variable capacitor (SSVC) with minimum dc capacitance is proposed. A variable ac capacitor (with capacitance variable from 0 to Cac) is conventionally realized by an H-bridge inverter and a large electrolytic dc capacitor with capacitance of 10 times the ac capacitance value, Cac to absorb the 2ω dc ripple. The proposed SSVC consists of a six-switch converter with two ports...
To provide an interface equipment between medium voltage ac grid and low voltage dc grid, an innovative resonant power electronic transformer (PET) structure is proposed and analyzed in this paper. Only one high frequency transformer is used in the proposed converter. To achieve high voltage with low voltage device, modular multilevel structure is introduced as converter valve. The proposed converter...
In this study, the input filter design and dc-bus voltage control of ac motor drives utilizing low capacitance film capacitor are investigated. The dc-bus voltage instability problem arising due to the resonance between the dc-bus capacitor and circuit inductances is explained. A dimensioning algorithm of dc-bus filter components for stable operation is given. The simulation results of the low capacitance...
A controllable output impedance method for parallel inverters system is proposed in this paper. The control strategy uses LCL filter in output side and add a current loop to adjusting the output current of the inverter bridge. With this modification, the output impedance of inverter is compensated to a specific value then the difference of line and filter impedance can be neglected. Redesigned output...
Variable carrier frequency control of PWM inverter based on deadbeat control using SoC-FPGA based hardware controller was proposed. To adopt to the fault ride through (FRT) conditions, deadbeat control was introduced to control the output current, and variable carrier method was applied to achieve high efficiency without the deterioration of controllability of the output current. The disturbance compensator...
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