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Fundamental target regarding aforementioned paper is to design a five level multi strand converter topology without a filter inasmuch as appropriated energy resources based dc-ac alteration system based dc-ac alteration system In this title we are proposing two strategies associated with five level's CHB inverter, specifically break even with step strategy and other is selective harmonic elimination...
In the multi-MW wind turbine market, the maximum power rating of a commercial wind turbine has been increased more than 5MW with a view to generate more power from Wind Power Sites [1]. The three-level neutral-point-clamped voltage-source converter has been highly applied in wind generation system. Despite the advantages, the capacitor voltage unbalancing in NPC converters has become a burning issue...
A typical distributed generation application (DG) only operates in grid-connected mode, for safety reasons. Recently, changes in Brazilian legal framework authorized islanded operation in some cases. This paper presents a dual mode LCL VSI for DG applications. The proposed system can operate in both, grid-connected or islanded, commutating between modes seamlessly. It was designed to operate with...
Dynamic Voltage Restorer (DVR), which has being considered to be one of the most cost-effective solutions to protect sensitive loads from voltage distortions, yet may be degraded in its compensation performance due to the poor response characteristic of the normally single-stage LC filter especially in situations of e.g. distorted load current. This paper proposes a structure of DVR characterized...
Electric power quality has become an important part of power systems and electric machinery, so the research on harmonic reduction and enhancement of Power Factor (PF) has become intensified. In this paper, a comparison between passive Power Factor Corrector (PFC) traditionally used in the power systems and an active PFC type based on buck boost conversion is drawn according to harmonic distortion...
A conventional Unified Power Quality Conditioner (UPQC) is a back-to-back shunt and series converters with a dc-link capacitor, requires 12 switches to resolve voltage and current related power quality issues. Recently a nine-switch UPQC (NS-UPQC) is proposed, but suffers with certain limitations like limited reference amplitude and phase shift, twice the rated dc-link voltage and increased stress...
The optimal DG allocation and sizing which results in the reduction of THD and the system losses using the backward and the forward sweep method is shown in this paper. The optimal location of the DG is obtained from various sensitivity indices. The size of DG is determined by the minimum loss criterion. BIBC and BCBV matrices are calculated to perform load flow analysis and harmonic flow analysis...
This work addresses a single-stage active power factor correction (PFC) scheme that is implemented using a Floating Interleaved Boost Converter (FIBC) equipped with an indirect Double Integral Sliding Mode Controller (DISMC) adopted for a single phase full bridge rectifier. Due to the high gain, high efficiency and small size components, FIBC-based approach can achieve unit power factor and voltage-regulation...
In this paper a simple control method involving new insertion index selection scheme for control of Modular Multilevel Converters (MMC) is proposed. In contrast with classical closed-loop methods, where all available arm voltages are measured and used in the generation process of insertion indices, this method uses available average voltage, i.e. the arithmetic mean of available upper and lower arm...
The use of a second phase in household electric wiring is a requirement for feeding heavy loads in those countries using 100 ~ 127 Vrms as the standard voltage. One problem of this wiring is the unbalance between phase currents since single-and two-phase loads coexist. A back-to-back topology is proposed for an active power filter to add it the ability of active power compensation. The presented topology...
The main purpose of this paper is the harmonic power flow in multiphase unbalanced radial distribution systems in the presence of non-linear loads and reactive components. It is important to have analytical methodologies to assess the impact and consequences of non-linear loads and shunt capacitors on voltage profile and harmonic distortion in each bus in the power systems. The presented power flow...
Modular Multilevel Converter (MMC) technology is rapidly evolving, and research is ongoing to make the MMC suitable for more applications. This topology comprises multiple Sub-Modules (SM) to form the output voltage levels with lower order harmonic contributions. In this paper, a reconfiguration control method for continuous operation during bypassed faulty SM is presented. The method accomplish to...
Electric energy is usually generated through power stations (hydroelectric, gas, coil, nuclear) interconnected to ensure the power supply; but in the last years a massive number of renewable energy resources have been integrated in the electric grid helping to fulfill the power demand. Nevertheless, the interconnection of multiple generation along the distribution system affects the power quality...
In this paper, a three-phase five level inverter with new balancing algorithm is proposed using Selective Harmonics Elimination PWM. The inverter is fed photovoltaic generator as dc source. 36 redundant vectors are making use for the 12 unbalance cases of four capacitor voltages instead of 24 cases presented in the previous works. The obtained results show that the frequency of the PWM is unchanged.
To reduce the weight of a satellite, an internal wireless system for satellites was proposed in a previous study. It is a system that can communicate between the satellite's subsystems by wireless communication modules. In this paper, we propose a complete internal wireless system for a satellite using microwave wireless power transmission technology and present the design of a 5.8 GHz high efficiency...
Z-Source inverter has become main aspect for buck and boost inversion, where the boost gain is limited due to more component voltage sag and swell are high. To avoid these new quasi resonant inverter called Switched-coupled-inductor quasi Z-Source Inverter (SCL-qZSI) is introduced. This SCL-qZSI adds one capacitor, coupled inductor and two diodes compare to traditional qZSI. Switching stress can be...
Growing the use of nonlinear devices for purpose of the controlling the machines as per our definition. These circuits are based on power semiconductor switching devices which are for most of harmonic source in our network. Due to negative effect of harmonics, the filtration of it must require. The active power filter is most superior solution in eliminating unwanted harmonics. This paper will speak...
Resonance is a common problem of power quality in the renewable energy power generation system, and its suppression strategy is closely related to the safe and stable operation of the grid connected with the renewable energy. In this paper, the generation mechanism and related influencing factors of resonance are analysed at first by analysing the specific resonance problem of photovoltaic power station...
This paper provides the switching angles that mitigate the dominant low-order line-to-line voltage harmonics in a cascaded H-bridge power converter with a single faulty switch. In this paper, first the firing angles for 5-level and 7-level converters are calculated by solving a set of nonlinear equations. Then, in the faulty condition, a set of switching angles for each phase that results in balanced...
Multimode cellular RFICs need high dynamic range in order to simultaneously satisfy the high linearity requirements of LTE and the low-noise performance of 2G. Traditionally, SAW filters are employed to relax the noise-linearity trade-off at the cost of higher BOM. In a highly competitive market, mobile devices need to support >35 LTE bands, a number which is expected to rise further in the future,...
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