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Design and analysis of a novel three phase discrete observer is proposed in this paper. A rotation matrix based on recurrence formula along with observer feedback matrix set for a particular frequency is used to formulate a structure such that accurate estimation is obtained for the designed frequency. This observer is used to filter out the switching noise percolating into the control loop by providing...
In the present circumstances in order to gratify the supply demand equation of electrical power the renewable energy source is the only alternative. However it is very difficult to comprehend and exploit renewable energy due to its stochastic character. That's why it is often cited as an obstacle for the grid integration. In most of the cases current controlled pulse width modulated voltage source...
This paper presents a comparative analysis of maximum torque per ampere control (MTPA) and zero d-axis current control (ZDAC) in Interior permanent magnet synchronous motor drive. Interior PMSM is preferred due its extra reluctance torque production. Zero d axis current control is used in most of the industrial application due its control simplicity. Due to thermal or reliability constraints the maximum...
This paper presents modeling and control for a single-phase grid-connected two-stage micro-inverter system. An average signal model has been developed for a single-phase bridge inverter. The proposed controller has three cascaded control loops. The inner current loop consists of a variable frequency hysteric current mode control which regulates output filter inductor current thereby improved system...
This paper described a synchronized output regulation (SOR) strategy for control of inverters working in grid-connected and stand-alone modes. As a concept of networked dynamic systems, SOR means that the nodes have their outputs synchronized but also demonstrate the desired wave shape. Both the inverter and the utility are regarded as two nodes of the simplest network consisting of themselves. In...
This paper proposed a high efficiency standalone inverter design for Google Little Box Challenge (LBC). A full bridge inverter is designed with two high frequency legs and one low frequency leg. To improve the system efficiency, asymmetrical unipolar modulation is utilized and interleaved switching is used. The synchronization between high switching frequency leg and low switching frequency leg is...
On account of its stochastic generation, system voltage fluctuation is one of the impediments to further increase the penetration level of the grid-connected photovoltaic system. However, the reactive power capacity of the photovoltaic inverter can be controlled to regulate the grid voltage. In this paper, the outer current control loop, which is designed in the dq synchronous reference frame, is...
This paper introduces a mathematical model and a voltage/frequency control scheme for inverter interfacing Grid Forming DG (VF) unit. The introduced control scheme utilizes the well understood and optimized dq-frame current control scheme that is used with inverter interfacing Grid Following DG (PQ) units. Minimum modifications are made to the control software to allow grid isolation operation of...
A photovoltaic (PV) supported cascaded H-Bridge multilevel inverter can be used to transfer the bulk solar power to the grid. It is considered that the dc link of the H-bridges is supplied from the PV array. The five-level cascaded H-bridge inverter enhances the power transfer rating and improves the output quality with carrier phase-shifted method of current control. Under varying radiation level...
This paper presents the preliminary results concerning the development of a multistring solar inverter system for dc microgrids. The proposed system is composed of two dc-dc converters as the dc input stage and an ac grid-tied bi-directional full-bridge inverter. Each input dc-dc converter operates with independent MPPT algorithms which are capable of extracting the maximum power even under shading...
The grid connected photovoltaic (PV) system have been modeled and simulated using control algorithm with dedicated PI control for dc link voltage regulation. Generally, the PI controller used for the system is tuned using trial and error method but this method is having manual limitation for the tuning of controller so as to obtain the desired response like as regulating dc link voltage to reference...
This paper proposes a frequency separation type current control system for a grid-connected single-phase five-level inverter. The proposed control system realizes high tracking performance and high disturbance suppression performance. To obtain high tracking performance to the sinusoidal reference signal, a repetitive controller is applied to the current controller. The current controller with a repetitive...
This paper presents the modeling, simulation, and performance evaluation of a hybrid proton exchange membrane fuel cell (PEMFC) with an energy storage system utilized in a grid-connected distributed generation (DG) system. To control the fuel cell/battery grid-side voltage source inverter (VSI), the conventional voltage-mode and current-mode control schemes with improved proportional-integral (PI)-fuzzy...
Cascade H-bridge multilevel inverter is a best candidate for static VAr compensation in medium and high voltage applications. The topology consists of several capacitors to provide dc link voltage support for H-bridge inverters. Regulation of the dc link voltages at the required levels is a major research challenge in VAr compensated inverters. This paper presents a novel and simple control strategy...
The system resonance frequency of a grid connected inverter with LCL filter depends on the filter parameters and the time varying grid impedance. To obtain stability and to preserve good dynamic behavior of the system, grid impedance adaptation of the current controller is proposed. The design of the current controller is described and the adaptation strategy to prevent the excitation of the system...
Energy efficiency and size reduction are crucial in modern power electronic converters where more energy saving and less volume of power converters are desired simultaneously. This paper will aim to propose efficient and compact boost-inverter operating at 200 kHz based on the Silicon Carbide (SiC) power switching devices. The boost-inverter using SiC power switches instead of Si devices will result...
This paper presents a simple carried-based discontinuous geometric modulation approach for three-phase voltage fed converters with multiple magnetically coupled legs. The proposed modulation technique produces multilevel equivalent PWM line-to-line output voltages with a reduced harmonic distortion. Moreover, it is proposed a mechanism to limit the circulating currents to acceptable values. It is...
In this paper, a combined control strategy for grid connected converters is proposed. A synchronous machine is emulated for synchronization and power sharing of the converter with the grid. In order to compensate the influence of grid voltage harmonics, a Proportional+Resonant controller is applied to harmonic compensation. Simulation results are presented to corroborate the theory.
This paper proposes a control method of a matrix converter in a micro grid system to obtain stable islanded operation. The islanded operation using a matrix converter needs a voltage feedback control to assume the matrix converter as a constant voltage power supply for the load. On the other hand, the islanded operation also requires a generator current control with a feedback to determine provided...
This paper deals with control of a kVA-rated power conversion system containing energy storage devices used for three-phase applications. Two main operating modes are possible: grid-feeding, when system operates as a power source connected to the grid, and grid-forming (standalone), when system operates as a voltage source supplying an islanded load. A two-level global control architecture is employed...
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