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This paper analyzes the impact of converter design elements on the operating performance of DC/DC converters, used worldwide for renewable energy sources. The design of inductor and capacitor elements is made considering the acceptable output ripple of voltage and current. This paper presents the methodology for determining the inductances and capacitances required for DC/DC converter operation within...
Renewable energy systems are playing an important role to reduce CO2 emission and provide electricity for daily use in rural areas. But brand new components with up-to-date technology could be far too expensive for many potential users (rural communities in many developing countries. As a consequence, turning waste components into energy production systems could be a good opportunity to reach these...
Photovoltaic power generation is growing worldwide at an accelerated pace. A cascaded multilevel converter topology based on Silicon Carbide switches and high frequency components in association with multiple maximum power point tracking capabilities addresses common limitations of central grid inverters, targeting a raise in the overall efficiency of large-scale photovoltaic power plants. The topology...
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 presents a control algorithm for dealing with the constraints of energy power source and a current-fed full-bridge converter. The advantages of this control scheme include transient and steady-state responses and robustness. The prototype of 26 V/100 V 250 W and its controller were implemented. A dSPACE DS1104 was used to implement the outer control loop by using flatness system's properties...
In order to suppress the switch voltage spike in the tapped-inductor boost (TIB) converter, a passive lossless snubber with minimum voltage stress is proposed. It consists of two capacitors and three diodes and takes advantage of the leakage inductance of the tapped-inductor. Moreover, it can readily be incorporated into an existing system since it does not modify the original TIB topology. The TIB...
In this paper, an isolated high step-up ratio dc-dc converter aimed to be used in interface systems between low voltage renewable energy sources, like photovoltaic panels and fuel-cells, and the utility grid is presented. The converter is based on the active clamp flyback topology with a voltage multiplier at the transformer secondary side. Such configuration, while naturally clamping the rectifier...
Self-excited induction generators produce power off-grid with capacitors placed in parallel with the load to supply the reactive power. The existing theory predicts an exponential growth of the phase voltages from the zero state when the linearized electrical system has unstable poles, a condition that requires a combination of minimum speed and sufficient capacitance. In practice, however, pre-charged...
This paper presents a power converter for grid connection of renewable energy sources, consisting of a ZETA converter associated with a bridge inverter operating at low frequency. The Zeta converter, operating in the discontinuous conduction mode (DCM), produces a rectified sinusoidal current waveform synchronized with the electric grid. The full-bridge inverter, connected to the output of the Zeta...
This paper presents generators models for rural electrification systems, fed from renewable energy. A brief introduction on wind energy and biomass system is shown, followed by dynamic modeling of three phase induction generator, single phase induction generators and Permanent Magnet generator. The aim of this research is to propose optimal electrification system design for rural areas, which are...
This paper presents the study and development of a processing power system to be used in the grid connection of renewable energy sources to the power grid. The system consists of a Zeta converter associated with a full bridge inverter operating at low frequency. The Zeta converter, operating in discontinuous conduction mode (DCM), plays the main role in this arrangement, producing a rectified sinusoidal...
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