A novel control scheme for dynamic reactive power compensation multilevel inverter based shunt hybrid active power filter

18th UKSim-AMSS International Conference on Computer Modelling and Simulation, UKSim 2016 --6 April 2016 through 8 April 2016 -- --This paper presents a novel control scheme for seven levels diode clamped multilevel inverter (DCMLI) topology based shunt hybrid active power filter which can compensate both dynamic reactive power and current harmonics in three phase three wire medium voltage distribution power systems as against many literatures that compensate fixed reactive power. It is on account of this novel control method, it can obtain better compensating performances compared with conventional fixed reactive power and harmonic compensation control. Dynamic reactive power compensation is supplied both active and passive filter parts of SHAPF with fixed dc link voltage. And also control algorithm for proposed SHAPF has shown its feasibility in suppressing harmonics produced by nonlinear loads. Theoretical analyses and simulation results are obtained from an actual industrial network model in PSCAD. The simulation results are demonstrated that harmonic compensation performance meets the IEEE-519 standard. © 2016 IEEE

A novel fuzzy logic control for bidirectional DC-DC converter and comparison with dual phase-shift control method in medium voltage applications

IEEE;IEEE Computational Intelligence Society;IEEE Instrumentation and Measurement Society2016 IEEE International Conference on Computational Intelligence and Virtual Environments for Measurement Systems and Applications, CIVEMSA 2016 --27 July 2016 through 29 July 2016 -- --In this study, operation, design and comparison of Dual Phase-Shift and Novel Fuzzy Logic control methods on isolated bidirectional DC-DC converter are discussed. The major components (DC link capacitors and inductors) are created for dual phase shifting method in order to obtain maximum efficiency. Triggering signals, voltage-current waveforms are compared and efficiencies are listed for all of these control methods at buck and boost modes of the full-bridge converter topology without using snubber capacitors to reduce cost feasibility. The main contribution of this paper, applying one of the most common used phase-shift control method, dual phase-shift and comparing with proposed novel Fuzzy Logic control method (Fuzzy-PSO-PI) on efficiency way for medium voltage applications. In this paper, isolated bidirectional DC-DC converter topology is modelled and control algorithms are written by FORTRAN programming language. © 2016 IEEE

PSO-PI Based DC Link Voltage Control Technique for Shunt Hybrid Active Power Filter

2nd International Conference on Systems Informatics, Modelling and Simulation, SIMS 2016 --1 June 2016 through 3 June 2016 -- --In power systems, the intensive use of nonlinear loads causes several power quality problems such as current harmonic pollution. In order to reduce the current harmonic pollution, the shunt hybrid active filter (SHAPF) is the best solutions effectively. In shunt hybrid active filter systems SHAPFs, the design of dc link controller is a significant and challenging task due to its impact on the performance and stability of the overall system. The main contribution of this paper is that the particle swarm optimization (PSO) algorithm is applied gains for PI controller which can result in the improved response in terms of response time and overshoot. In proposed control method, the performance results of harmonic compensation are satisfactory. Theoretical analyses and simulation results are obtained from an actual industrial network model in PSCAD. The simulation results are presented for proposed system in order to demonstrate that the harmonic compensation performance meets the IEEE-519 standard. © 2016 IEEE

Performance investigation of high level modular multilevel inverter based shunt hybrid active power filter

2016 International Symposium on Fundamentals of Electrical Engineering, ISFEE 2016 --30 June 2016 through 2 July 2016 -- --The multilevel inverters have become popular equipment for medium and high power applications in recent years. These inverters can constitute high voltage and decrease harmonics by their own circuit topologies. This paper presents a modular multilevel inverters based SHAPF for medium voltage applications, focusing on its control method and operating performance. The compensation process is based on synchronous reference frame method. Theoretical analyses and simulation results are obtained from an actual industrial network model in PSCAD. The simulation results are presented for a proposed system in order to demonstrate that the harmonic compensation performance meets the IEEE-519 standard. © 2016 IEEE

Adaptive Input Voltage Prediction Method Based on ANN for Bidirectional DC-DC Converter

2nd International Conference on Systems Informatics, Modelling and Simulation, SIMS 2016 --1 June 2016 through 3 June 2016 -- --For industrial applications, Bidirectional DC-DC converters (BDCs) are used in recent years. And also their efficiency results are improved to apply different control methods. ANN algorithms is one of the new control topic in literature. This paper attempts to improve the dynamic performance of bidirectional dc-dc converter. And it deals with a novel control scheme related with an adaptive input voltage control by using ANN algorithms based on SOM. Firstly, adaptive input voltages are classified by ANN algorithms (SOM, SVM, FF) and the best suitable and proposed ANN algorithm is SOM which is selected for this controller. The best efficiency case is selected in this algorithm. Then, the voltage values are predicted. This voltage values are used in simulation models. Thus, the proposed system works both effective and high efficiency. Theoretical analysis and simulation results obtained from an actual industrial network model in PSCAD verify the viability and effectiveness of the proposed Bidirectional DC-DC Converter (BDC). © 2016 IEEE

A fuzzy neural network approach to estimate PMSG based and DFIG based wind turbines' power generation

7th International Conference on Innovative Computing Technology, INTECH 2017 --16 August 2017 through 18 August 2017 -- --Neural networks and fuzzy systems are amalgamate their advantages and to eliminate its individual disadvantages. Neural networks have its computational characteristics of learning in the fuzzy systems and receive from them the interpretation and clarity of systems representation. Thus, the disadvantages of the fuzzy systems are fulfilled by the capacities of the neural networks. These techniques are complementary, which prove its use together. This is called fuzzy neural networks In this paper, a fuzzy neural network is applied to estimate PMSG based and DFIG based wind turbines' power generation. The obtained results showed that this model can be used to predict wind turbine power generation and performance analysis both two type turbines in a simple, reliable and accurate way. © 2017 IEEE

Modelling of wind turbine power output by using ANNs and ANFIS techniques

7th International Conference on Innovative Computing Technology, INTECH 2017 --16 August 2017 through 18 August 2017 -- --In this study, artificial neural network (ANN) and adaptive neuro fuzzy inference system (ANFIS) were applied to estimate the wind turbine power output of a horizontal axis wind turbine. Hub-height wind speed, atmospheric air temperature and rotational speed values obtained from an operating wind power plant (WPP) were employed as input data in the model. According to the derived results, the mean absolute percentage error (MAPE) and correlation coefficient (R) values for the ANN model were determined as 4.41% and 0.9850, respectively, whereas the corresponding values for the ANFIS model were found as 2.19% and 0.9971, respectively. The obtained results showed that ANN and ANFIS models can be used to predict wind turbine power output in a simple, reliable and accurate way. © 2017 IEEE

Fuzzy logic controlled DC-DC converter based dynamic voltage restorer

This paper presents fuzzy logic controlled dc-dc boost converter based Dynamic Voltage Restorer (DVR) to compensate severe voltage sag problems in an electrical system. DVR absorbs real power from battery to compensate voltage sags in the system. This condition causes reduction in voltage magnitude of dc-link capacitor. Additionally, DVR requires large dc capacitors to compensate long and severe voltage sags in the system. In this study, dc-dc boost converter is connected to DVR for keeping dc link voltage constant. For this propose, a control algorithm based on Fuzzy Logic (FL) control is developed for dc-dc boost converter. The main contribution of this study is that Fuzzy Logic (FL) is firstly used to generate reference signal for PWM signals of dc-dc converter applied in DVR. FL is a very flexible controller which keeps the dc link voltage constant during voltage sag. The performance results of proposed study are verified with PSCAD/EMDTC. © JES 2015

Simulation modelling and analysis of modular cascaded multilevel converter based shunt hybrid active power filter for large scale photovoltaic system interconnection

Modular multilevel inverters are promising candidates for next generation of efficient, robust and reliable inverters in large scale photovoltaic system. A modular cascaded multilevel inverter based shunt hybrid active power filter (SHAPF) for three phase grid-connected large scale PV systems is represented in this paper. The main contribution of this paper is to model and control of grid interfaced large scale photovoltaic system with embedded hybrid active power filter functions. In proposed system, the features of hybrid active power filter have been amalgamated in the control circuit of the voltage controlled voltage source inverter interfacing the photovoltaic system to the grid. As a result, the same inverter part of SHAPF is utilized to inject power generated from photovoltaic source to the grid and also to act as hybrid active power filter to compensate harmonics and reactive power demand. With using compensation ability, the grid currents are sinusoidal and in phase with grid voltages. The whole system is modeled in PSCAD/EMTDC. The simulation results are demonstrated to verify the operation and the control system of the proposed system. © 2016 Elsevier B.V.FDK-2016-5828 115R327 National Council for Scientific ResearchThe authors would like to acknowledge the Scientific and Technological Research Council of Turkey (TÜBİTAK Project Number: 115R327 ) and the Scientific Project Unit of Cukurova University ( FDK-2016-5828 ) for full financial support