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The utilization rate of the power conditioner in the grid-tied solar power system is low because the operation of photovoltaic (PV) cell depends on the sunlight. Adding the small scale wind power generating system to the existing solar power system can increase the utilization rate of the power conditioner. In this paper, we propose a novel design method by which the small scale wind power generating...
Building is responsible for more than 40 percent of energy consumption and one third of greenhouse gas emissions. Europe has stablished the path towards nearly zero-energy buildings (nZEB), soon required in every new construction and large renovation in existing buildings by 2020. Achieving nZEB required the use of photovoltaic modules for generating electricity. In Vietnam, photovoltaic systems are...
This paper introduces a predictive voltage controller for multilevel inverter used in Dynamic Voltage Restorer, which is able to protect a sensitive load against grid voltage sags dynamically. The compensated voltages are obtained by using Phase-Lock Loop to detect the phase and the magnitude of the grid voltage then compare to the load reference voltage. A three-phase NPC inverter with output LC...
This paper proposes a new switching method to increase the efficiency in Dual Active Bridge converter (DAB). Two level PWM is general method but the efficiency is lower than three level PWM. In this paper, three level inverter is applied in DAB and the efficiency is compared two level PWM. The power loss of MOSFET checked and the power loss with three level PWM is expected to lower loss. The dead-time...
This paper reviews the existing structures for converter stages in renewable energy and motor drive systems that offer high voltage gain at the input of an inverter. The inverter may also connect the DC supply to the utility grid. For traction motor drives in vehicle and rail transport and in high-frequency transformer connected grids, bi-directional power flow capability is also required. Cascaded...
A new strategy for controlling single-phase dual-active-bridge converter is proposed in this paper. It is realized by employing dynamic control of the direct and quadrature current components, detached from the transferred current. The direct component Id is determined approximately from the terminal current, whereas, the quadrature one, Iq, is estimated by a reduced-order observer. All the models...
This paper proposes a Discontinuous current mode (DCM) feedback current control for the grid-connected inverter in order to achieve the low THD of the grid current at wide load range. In the DCM operation, the nonlinearity between the duty ratio and the current occurs in the current command response, whereas another nonlinearity between the disturbance voltage and the current occurs in the disturbance...
In this paper, a SVPWM for an indirect matrix converter (IMC) with dual output inverter has been proposed to eliminate the common-mode voltage (CMV). The presented converter is a combination of the conventional rectifier stage and a dual inverter stage for feeding open-end winding load. The principles of selecting suitable active vectors and zero vectors and then properly arranging the switching sequence...
This paper proposes an enhanced distributed generation (DG) unit with an adaptive virtual impedance control approach in order to solve the inaccurate reactive power sharing problem. The proposed method can adaptively regulate DG units with the aid of the equivalent impedance, and the mismatching problem of the feeder impedance is compensated by sharing the reactive power accurately. The proposed control...
This paper presents an enhanced reconfiguration method for the cascaded H-bridge inverter (CHBI) that maintains high quality of the output voltage waveforms. This method is based on controlled shifting of the system neutral point together with the phase-shifted pulse-width modulation (PS-PWM) scheme. During fault conditions, if the carrier signals are not properly adjusted in the healthy working power...
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