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The electrostatic precipitator (ESP) system depends heavily on the three-phase IGBT intelligent inverter high voltage (HV) power supply. To improve the dynamic responses of ESPs during the event of flashovers and back corona, a magnificent nonlinear-controll technology called hysteretic current-mode control (HCMC) concept is proposed based on the working characteristics of ESPs. This method adapts...
The boost inverter can be an alternative grid interfacing power converter for renewable energy sources since it can generate an AC voltage whose peak value could be greater than the DC voltage. When it connects to the grid, high quality output current is required, therefore, grid current is hoped to be controlled directly. A novel control strategy to control grid current with only one closed control...
A filter-based control scheme is developed for buck-type converters. This approach relies only on a single output voltage measurement. The benefits of this approach are reducing the system cost as well as measurement noise and disturbance injected by output current and/or inductor current measurements. A Lyapunov stability analysis is utilized to demonstrate system stability. Experimental results...
Renewable energy sources are obviously accepted as clean energy sources of future. The solar energy is the most popular among other renewable energy sources in all over the world. Many studies are performed on photovoltaics (PVs) and solar energy systems. Inverter is the most important power converter section of photovoltaic systems in terms of efficiency in changing weather conditions. This study...
Single-phase inverters suffer from double-frequency ripple of the input power. For mitigation, an input capacitor is applied but the fluctuation range of power across it is limited according the desired fluctuation in the dc-link voltage. To realize power decoupling without changes in the main circuit and in the control strategy of it, an additional independent power decoupling circuit can be applied,...
This paper proposes a controller design to compensate the current harmonics from the nonlinear load when a grid-connected inverter operates as an active power filter. When the LCL filter is installed at the output of inverter, the controller should be designed differently depending on the location of the nonlinear load. As this nonlinear load is connected to the grid before or after the grid side...
Conventional photovoltaic (PV) systems using a micro-inverter tend to be complex and costly as three separate converters (i.e., a boost converter, inverter, and voltage equalizer to prevent partial shading issues) are necessary. This paper proposes a novel micro-inverter integrating a voltage equalizer to achieve not only system-level but also circuit-level simplifications. The voltage can be boosted...
In order to simplify the configuration of photovoltaic (PV) grid-connection system, this paper proposes to adopt a buck-boost dc-dc converter, and then develops a single-phase inverter via the connection with an H-bridge unfolding circuit with line-commutated. Depending on the conditions of dc input-voltage and ac output-voltage, the proposed circuit can work functionally as either a step-down or...
In this paper, a transformerless photovoltaic (PV) power conditioning system (PCS) based on the AC/DC boost inverter is proposed, which is capable of solving leakage currents and second-order power ripple issues. In this topology, the leakage current is reduced significantly since most of common-mode currents flow through the output capacitor instead of parasitic capacitors and grounding resistor...
This paper presents a filter-based control scheme for an H-Bridge inverter with output LC filter. This approach relies only on a single output voltage measurement to reduce the system cost as well as measurement noise and disturbance injected by output current and/or inductor current measurements. To reduce the controller sensitivity to the system parameters, the proposed controller is developed for...
This paper presents a comparative analysis of different shoot through control schemes employed in Z-source inverters. Z-source inverter provides a single stage power conversion topology which can give both voltage buck and boost properties. This paper also gives an insight on the working of Z-source inverter by utilization of shoot through forbidden states. These states are utilized by implementing...
This paper presents an on-grid photovoltaic (PV) in a micogrid which is including a PV array, a boost converter, an inverter and an LC filter. The main challenge of designing the proposed system is the ability to combine the power electronic converters with the corresponding control method to achieve best performance. In this paper, a voltage-current mode controller is proposed to adjust both the...
The boost inverter is an attractive solution for photovoltaic (PV) microinverters since it is a single stage architecture. Indeed, in comparison, most of the microinverters topologies consist of two-stage structures, a DC-DC converter for voltage elevation and an inverter for grid connection, resulting in a lower efficiency. The boost inverter consists of two DC-DC boost converters connected in differential...
This paper proposes a single-phase bridge inverter with both voltage-boosting and power decoupling capabilities. The proposed inverter topology diverts the second-order ripple power into a small film capacitor instead of using a bulky electrolytic capacitor at the DC side, thus eliminating the large electrolytic capacitor that has a short lifetime. The voltage across the decoupling capacitor is controlled...
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...
Compared with traditional inverters (VSI & CSI) family, Z source topology has feasible merits of less component count, single stage conversion and boosting of voltage which opens the path to various applications particularly in distributed generation system with renewable & alternative energy source. This paper presents the review of role of Quasi inverter in renewable energy system, as this...
It is known that energy source used in car today comes from fuel, which generates pollution to the environment. The scientists have forecasted that the amount of oil will be decreasing in the future. In the present, scientists and engineers seek for new energy sources to reimburse oil. Causing no harm to the environment is the first priority. To overcome this problem, the electric vehicle is the popular...
In conventional photovoltaic microinverters configuration, a single PV module is connected to the grid through two converter stages: a step-up dc-dc stage and a step-down dc-ac stage. In the first stage, a high frequency transformer is generally used to achieve the high step-up voltage ratio conversion to a voltage above the grid peak value, reducing the converter efficiency while increasing its size...
The solar based grid-connected power system is becoming a very fast growing area due to the shortage of the fossil fuel energy and the great environmental pollution. But the grid continuously supplies the power even when load is not present. This cause harmful situation in and around the grid. In the proposed technique, First Zeta converter is designed using PID(Proportional Integral Differential)...
The main aim of this paper is to reduce the distortion produced in the output side of the AC mains of electronic ballast. The paper implies design of electronic ballast (EB) for compact fluorescent lamps (CFL) by replacing the conventional electronic ballast circuitry with improved SMPS and inverter topologies. Here zeta converter (DC/DC converter) is implemented as power factor correction circuit...
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