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The limited capacity of a single inverter has encouraged the usage of parallel inverters for the interconnection of renewable energy generation system. The current-sharing control is one of the commonly used operating strategies for parallel inverters; however, the conversion efficiency using conventional current sharing is low at light loads. Therefore, a smart control strategy for conversion efficiency...
This paper presents a DVR system using the cascade inverter to perform an effective compensation for the voltage sag. By splitting the DVR-injected active and reactive power from different inverter unit, the designated dynamic voltage restorer not only provides the battery a ripple-free dc link to extend the lifetime of battery, but also offer a flexible way to design the capacitor bank in the system...
Parallel inverters are often used for the interconnection of Renewable Energy Generation Systems (REGSs); however, the output efficiency using the conventional current-sharing control scheme is low at light loads. Therefore, an intelligent control scheme for output efficiency enhancement of parallel inverters is proposed in this paper. The proposed control scheme is based on the output efficiency...
In case of the grid connected transformerless photovoltaic (PV) inverter, the leakage current through the parasitic capacitance of the PV panel can cause very serious electromagnetic interference problems. In this paper, a more accurate high frequency PV array model is proposed. It includes the influence of PV frame, mounting rack, solar cell material and area. Based upon that model, the common mode...
Electromagnetic magnetic interference (EMI) issue has become one of the urgent problems to be solved in the photovoltaic (PV) inverter system. Therefore, it should not be ignored. In order to optimize the EMI filter design, high frequency characteristic of a PV system is studied in this paper. A conducted EMI model is proposed. The proposed model take into consider the influences of PV array parameters,...
Nowadays, electromagnetic interference (EMI) seems to be one of the major constraints of photovoltaic inverters. Unfortunately, it is too often regarded as the last phase of the development of the system since it represents the last step of its marketing. This paper discusses DC side EMI filter design methodology for photovoltaic inverter System. An analysis of noise source and propagation path impedances...
The occurrence of leakage current (also called ground current) that can occur in photovoltaic (PV) system depends strongly on the value of parasitic capacitance between PV cell and its metal frame, usually earth connected. This paper presents a straightforward approach to calculate the involved panel parasitic capacitance in order to predict the likeliness of such leakage current. A novel 2-D parasitic...
Nowadays transformerless PV converters are widely used in the energy conversion stage of a PV plant, because their good characteristics regarding efficiency, size, cost and weight. The main problem in transformerless PV systems is the common mode voltage variations that can generate leakage ground currents through the parasitic capacitance formed between the PV panels and ground. This paper comparisons...
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