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This paper presents a unified selective harmonic compensation strategy using DG-interfacing inverter with LCL filter in the presence of nonlinear local loads for both grid-connected and islanded microgrid. Compared with the existing harmonic compensation methods in the literature, the proposed strategy consists of a triple-control-loop in the grid-connected mode to compensate the grid current harmonics...
Distribution grids unbalance challenges the DC-link of the Smart Transformer leading to higher ripples and then the lifetime of the DC aluminium electrolytic capacitors (AEC) is reduced. Additionally, dead time and nonlinearity characteristic of IGBT also may introduce ripple current in DC link, potentially decreasing the lifetime of AEC. Based on physical characteristic of AEC, the lifetime estimation...
Unified power quality conditioner (UPQC) consists of combined shunt and series active power filters for improving both the power quality on the source side and on the load side. The paper presents a simple method for controlling the series filter under unbalanced and distorted load conditions by using a three phase locked loop (PLL). Two methods for controlling the shunt filter are analyzed. The model...
In the micro-grid, renewable energy is used as power generations and source voltage fluctuated. So we proposed to use Matrix Converters (MCs) which have voltage control ability instead of transformers to supply a certain amount of power for the consumer sides [1]. To suppress the fluctuation of the amplitude of the source voltage, we had proposed a load voltage control method for the MCs [2] [3]....
This paper presents a 27-Level asymmetric multilevel shunt active power filter topology that allows the compensation of a nonlinear load, as well as the DC voltage regulation thanks to a comprehensive control strategy. The topology considers the ratio 9∶3∶1 in order to generate the AC waveform with a simple staircase modulation algorithm. The dynamic model of the proposed topology is obtained and...
In this paper a multilevel transformerless hybrid series active filter is proposed to enhance the power quality of a single-phase residential household. The proposed topology reflects new trends of consumers toward electronic polluting loads and integration of renewable sources which in fact may lead to the scope of a reliable and sustainable supply. This paper contributes to improvement of power...
The DC onboard microgrid of a More Electric Aircraft (MEA) comprises of multiple Point Of Load (POL) converters to cater to diverse loads at different voltage levels. Lightly damped LC filters are typically used at the inputs of these POLs to reduce the noise in the system. Any tightly regulated POL acts like a Constant Power Load (CPL) and exhibits negative incremental impedance. The interaction...
This paper discuss control of DVR using SPLL (Software Phased Locked Loop) strategy for compensation of PQ disturbances in power DS (Distribution System) network. Using this control strategy, fundamental reference load voltages are estimated using magnitude of fundamental active and reactive components of source voltages. The SPLL strategy based DVR is modeled in MATLAB R2013b environment using SIMULINK...
In this paper, Design and development of control circuit algorithm of 3-Φ Voltage Source Inverter (VSI) using Unipolar Sinusoidal Pulse Width Modulation (SPWM) techniques is proposed using STM32F407VGTx discovery board interfaced with MATLAB Simulink Environment. For implementing 3-Φ VSI, this method is most useful as it will eliminate complexity of control circuit algorithm occurred due to analog...
This paper proposes a method to calculate the THD% value of the line-to-line voltage waveform at the PCC (Point of Common Coupling) in a shipboard system using an interconnection between Simulink and a power simulator, ETAP. Nowadays, electrical shipboard systems are more and more characterized by AFE (Active Front End) drives that allow more flexibility in the power drive but they can affect the...
This article presents a study of a design of four controllers to a ladder converter modeled by the generalized equivalent continuous model. Two controllers are designed minimizing the energy of the input and minimizing the states; and the other two controllers are designed minimizing the changes in the input, and the states. Also, the article shows a Kalman filter with shaping noise filter to estimate...
To improve the quality of output power of VSIG grid-side converter under the working condition of asymmetric load, this paper, based on the instantaneous symmetrical component method, studies double closed loop control strategy under synchronous rotating coordinates of positive and negative sequence, and designs corresponding decoupling strategy. In order to further curb disturbance of asymmetric...
The renewable energy resources provide us with green energy and flexible integration into power grids, but due to their variable nature, they cause significant frequency, voltage and power fluctuation for power system so that a sophisticated control strategy is needed to cope with these challenges. In this paper, the proposed control strategy consists of inner voltage and current controller and outer...
This paper presents a new approach of input-output feedback linearization control applied to the three-phase three-level four-wire neutral point clamped (NPC) converter. Under the proposed control strategy, the NPC converter demonstrates the capability to achieve simultaneously two tasks. The first task is to operate as a nonpolluting rectifier by regulating and nearly equalizing the two dc capacitor...
This paper concentrates on a multi-loop hierarchical controllers for a microgrid system in order to design a modified local voltage controller with a proper power sharing performance. The proposed controller which contains inner current and voltage loops, is based on dynamic model of microgrid system. This controller regulates the switching functions of interfaced-inverters and the reference values...
Power quality in distribution system is one of the chief concerns in the modern industrial and commercial applications. Power quality problem is an occurrence manifested as a non-standard voltage, current or frequency that results in a failure of end user equipments. However critical problems in power quality have been recognized such as transients, sags, swells and harmonic distortions. Out of these...
A nonlinear control for a three-phase seven-level Neutral Point Clamped (NPC) inverter based Shunt Active Power Filter (SAPF) is proposed in this paper. The aim of this system is to mitigate the undesired reactive power and current harmonics created by nonlinear loads. The model of the Multilevel Shunt Active Power Filter (MSAPF) is divided into two subsystems including a Multi-Input Multi-Output...
A control method of a Matrix Converter to convert from four-wired three-phase voltages to three-wired single-phase voltages (single-phase MC) which replaces transformer in consumer side on micro-grid has been found [1]. In the single-phase MC, voltage drop and phase shift in its load voltage occur because the line current flows due to the input and output filters. So we proposed the load voltage control...
This paper presents a control technique for enhancing the stable operation of distributed generation (DG) units during islanding and grid-connected modes. The compensation of instantaneous variations in the reference current components of DG units in ac-side, and dc-link voltage variations in dc-side of interfaced converters, are considered properly in the control loop of DG units, which is the main...
This paper presents a model-based predictive control scheme for a dual-output Nine-Switch Inverter (NSI) with output filter. The conventional Pulse Width Modulation (PWM) method for NSI control is very complicated, it requires a multi-loop control scheme and implementation incurs high computational costs. Conversely, the proposed predictive control scheme is simple and controls two the three-phase...
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