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This paper presents a design approach for renewable energy power systems operation in case of power outage or grid failure. The grid connected distributed power system delivers energy to the consumers located on the micro-grid, operating at distribution voltage level, and also delivering the remaining surplus energy to the main distribution grid. The optimal and permanent system operation is when...
In order to solve the distribution of voltage quality problems, this paper presents a new voltage regulation control strategy of distribution network based on switched affine model. By establishing the state space equation of the controllable series voltage regulation device, using the method of Lyapunov function and quadratic stability theory, according to the convex combination stability theory,...
Inverters play important role in photovoltaic (PV) systems integration into power grid. Inverter affect power quality (PQ), as well as stability of power grid. PQ become prominent issue for many electricity companies due to widely used nonlinear loads. In this paper, an Adaptive Multilevel Inverter (MLI) is proposed to response PQ problems in PV systems integrated into power grid. The approach of...
This article presents advanced vector control technique for a five-level cascaded H-Bridge inverter for integration of distribution generation based on renewable energy to the power grid. The presented control strategy has designed with SRF PLL and the proposed control plan is completed by setting suitable reference current components for the d and q axis in the control loop of DG, which are given...
This paper reports a study on a grid-tied photovoltaic system, using a microinverter based on Ćuk converter working in DCM. Since, when the Ćuk converter is working in DCM, its output voltage presents a linear behavior in relationship to its duty cycle. Therefore, the duty cycle must have a sinusoidal behavior, in absolute value, in order to generate a rectified sine current waveform, at its output...
Switched Intelligent Grid Networking Systems (SIGNS) [31] is the result of research, analysis and development of an alternative process for controlling end-user electrical power quality, as well as transients on the incoming electricity supply grid. In the past power quality issues associated with the grid network were usually generated by the connected loads. This has changed in today's grid system...
Voltage pulsations in the DC bus may develop if the voltage-source inverter is fed from an unbalanced voltage supply. Negative effects on the connected electric machine and on the power grid usually result from such operation. It is possible to entirely eliminate or at least minimize such negative effects by suitable control of the active front end of the inverter. The control range of the active...
Conventional anti-islanding techniques used in grid-tied photovoltaic (PV) systems pose many disadvantages at high levels of PV deployment. One such issue is the inability of these systems to ride-through grid disturbances. In this paper, the use of a Power Line Carrier Communications (PLCC) Permissive anti-islanding scheme is investigated as a means of safely enabling ride-through operation of grid-tied...
For future all-electric ships, one possibility is a DC grid fed by converter-controlled generators and loaded by converter-controlled components. The consumers can be categorized by their power demand - mainly constant or pulsed operation. Especially pulsed power is a major challenge in the scope of grid stability and, therefore, has to be analyzed and assessed in the early conceptual-design phase...
Static Compensator (STATCOM) has been widely proposed for power quality and network stability improvement. It is easily connected in parallel to the electric network and has many advantages for electrical grids. It can improve network stability; power factor, power transfer rating. It can also avoid disturbances such as voltage sag (dip) and swell which is the main concern of this paper. This paper...
This paper presents a new micro-inverter topology that is intended for single-phase grid-connected PV systems. The features of the proposed topology are: (1) eliminating the double-frequency power ripple using small film capacitor; (2) improving the maximum-power-point tracking (MPPT) performance; (3) using long life-time film capacitors, which will improve the reliability of the inverter; and (4)...
In the transformerless photovoltaic (PV) system, the common mode ground leakage current may appear due to the galvanic connection between the PV array and the ground, which causes the safety issues and reduces the efficiency. To solve this problem, a novel inverter topology with switched capacitors is proposed in this paper. By connecting one pole of the PV cell directly to the neutral line of the...
Extracting as much as wind energy as possible and feeding the grid with high quality power are the two main targets for the grid connected wind turbine system. This paper proposes the design of an efficient controller for the 3.2KW wind turbine which grabs the maximum power from the available wind. The 3.2 KW wind turbine system provides a variable frequency AC voltage and this variable frequency...
In this paper, a new circuit implementation of Carrier Phase Shifting Sinusoidal Pulse Width Modulation(CPS SPWM) for grid connected cascaded multilevel inverter is presented. The SPWM control scheme is realized with only a single Field programmable gate array (FPGA) chip EP1K from ALRERA, Inc. and the programming language is Very High Speed Integrated Circuit Hardware Description Language (VHDL)...
In this paper, a high gain single-stage buck-boost grid-connected system is proposed. The proposed system consists of a high voltage gain - high efficiency - switched inductor buck-boost converter (SIBBC) and a folded cascade H-bridge inverter. The proposed converter switch is derived with a sinusoidal modulation, so that the converter output voltage is a rectified sine wave which requires only a...
The purpose of this paper is to provide low cost, high power quality and high efficiency solutions for grid-connected inverters. Compared with bipolar switched inverters, unipolar switched inverters have the advantages of higher efficiency due to reduced switching frequency and low iron losses of inductor in output filter. However, unipolar inverters produce large harmonic distortion due to the dead-time...
Vehicle to grid (V2G) power transfer has been under research for more than a decade because of the large energy reserve of an electric vehicle battery and the potential of thousands of these connected to the grid. In this study a complete analysis of the front end inverter of a non-isolated bidirectional EV/PHEV charger capable of V2G reactive power compensation is presented.
In this paper, a high frequency (HF)-based three-phase Semicontrolled rectifier-current source inverter system is proposed for grid-connected permanent magnet wind generators. The main advantages of the topology are: high efficiency due to less power losses and reduced number of switching elements, high output power density realization, reduced passive component ratings proportionally to the frequency,...
This paper presents a software-based adaptive dead-time compensation technique for single-phase grid-connected photovoltaic (PV) inverter system. To prevent a short circuit in the dc-link, a switching delay time is needed to be inserted in Pulse Width Modulation (PWM) signals. This causes the dead-time effect which is harmful to the system performance. To improve the mitigation of dead-time effect...
This paper presents a critical study of modulation strategies for three level Diode Clamped Voltage Source Inverter (DCVSI) for grid connected wind turbine. The survey is carried out on two types of modulation techniques popularly used in three level DCVSI, viz. Sinusoidal PWM and Space vector PWM. Purpose of the survey is to critically analyze and identify the problems associated with existing DCVSI...
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