scholarly journals A power quality enhanced for the wind turbine with sensorless direct power control under different input voltage conditions

2021 ◽  
pp. 64-71
Author(s):  
Z.E.Z. Laggoun ◽  
H. Benalla ◽  
K. Nebti
Keyword(s):  
Power Control ◽  
Reactive Power ◽  
Harmonic Distortion ◽  
Electrical Energy ◽  
Input Voltage ◽  
Voltage Sensor ◽  
Direct Power ◽  
Direct Power Control ◽  
Grid Voltage ◽  
Active And Reactive Power

Introduction. The quality of electrical energy is essential during disturbances, at the level of power electronic devices will suffer serious operating problems causing dangerous damage. Aim. A new approach to direct power control without grid voltage sensor improves the quality and control of instantaneous active and reactive power converters. Methodology. First, the technique without network voltage sensor with a direct power control based on a switching table, which is a classic approach, is discussed and its performance is analyzed under increasing and decreasing load. In addition, the performance of the proposed technique is also analyzed under the same circumstances and their performance is compared. Originality. The new method consists of a nonlinear grid voltage modulated controller and a conventional controller which guarantees very good results in a polluted network. The proposed method is verified using MATLAB/Simulink. Results. The simulation results under different input voltage conditions show that the proposed method not only has good tracking performance in active and reactive power, but also reduces the current total harmonic distortion to 1.9 %, which is good lower than the requirement for network operation.

Predictive Direct Power Control (PDPC) of Grid-connected Dual-active Bridge Multilevel Inverter (DABMI)

2017 ◽  
Vol 8 (4) ◽  
pp. 1524 ◽  
Author(s):  
H.H. Goh ◽  
Azuwien Aida ◽  
S.S. Lee ◽  
S.Y. Sim ◽  
K.C. Goh
Keyword(s):  
Power Control ◽  
Reactive Power ◽  
Power Grid ◽  
Harmonic Distortion ◽  
Multilevel Inverter ◽  
Energy Integration ◽  
Direct Power ◽  
Direct Power Control ◽  
Dual Active Bridge ◽  
Model Predictive Control Algorithm

This paper deals with controlling a grid-connected dual-active bridge multilevel inverter for renewable energy integration. The concept of direct power control is integrated with model predictive control algorithm, which is termed as predictive direct power control, to control the real and reactive power injected into the power grid. The proposed multilevel inverter allows more options of feasible voltage vectors for switching vector selections in order to generate multilevel outputs, and thereby obtaining high power quality in the power grid. By using the predictive direct power control, simulation results show that the proposed multilevel inverter produces lower power ripple and manage to achieve currents with low total harmonic distortion which are well within the IEEE standard. The modeling and simulation of the system are implemented and validated by MATLAB Simulink software.

Direct Power Control of Doubly Fed Induction Generator Based on the Estimated Stator Flux

2014 ◽  
Vol 1070-1072 ◽  
pp. 1111-1114
Author(s):  
Jing Wang ◽  
Xiang Dong Wang
Keyword(s):  
Power Control ◽  
Reactive Power ◽  
Dynamic Performance ◽  
Induction Generator ◽  
Doubly Fed Induction Generator ◽  
Direct Power ◽  
Direct Power Control ◽  
Active And Reactive Power ◽  
Stator Flux ◽  
Doubly Fed

In order to improve the dynamic performance, based on the analysis of the dynamic model of doubly fed induction generator (DFIG), this paper presents an improved direct power control strategy which is based on the direct control of stator active and reactive power of DFIG. The proposed method only utilizes the estimated stator flux by the stator resistance which is the only machine parameter, so as to remove the power dithering resulting from the inaccuracy associated with rotor flux estimation. In the Matlab/Simulink, simulation results for a 15KW DFIG system demonstrate the high accuracy and excellent dynamic performance during variations of active and reactive power, and revolution.

scholarly journals A new switching look-up table for direct power control of grid connected 3L-NPC PWM rectifier

2021 ◽  
Vol 12 (3) ◽  
pp. 1413
Author(s):  
Azziddin M. Razali ◽  
Nor Azizah Yusoff ◽  
Kasrul Abdul Karim ◽  
Auzani Jidin ◽  
Tole Sutikno
Keyword(s):  
Power Control ◽  
Reactive Power ◽  
Supply Voltage ◽  
Harmonic Distortion ◽  
Pwm Rectifier ◽  
Direct Power ◽  
Direct Power Control ◽  
Pulse Width Modulated ◽  
Look Up Table ◽  
Dynamic Performances

This paper presents a comprehensive and systematic approach in developing a new switching look-up table for direct power control (DPC) strategy applied to the three-phase grid connected three-level neutral-point clamped (3L-NPC) pulse width modulated (PWM) rectifier. The term of PWM rectifier used in this paper is also known as AC-DC converter. The approach provides detailed information regarding the effects of each multilevel converter space vector to the distribution of input active and reactive power in the converter system. Thus, the most optimal converter space vectors are able to be selected by the switching look-up table, allowing smooth control of the active and reactive powers for each sector. In addition, the proposed DPC utilizes an NPC capacitor balanced strategy to enhance the performance of front-end AC-DC converter during load and supply voltage disturbances. The steady state as well as the dynamic performances of the proposed DPC are presented and analyzed by using MATLAB/Simulink software. The results show that the AC-DC converter utilizing the new look-up table is able to produce almost sinusoidal line currents with lower current total harmonic distortion, unity power factor operation, adjustable DC-link output voltage and good dynamic response during load disturbance.

scholarly journals Predictive Direct Power Control for Dual-Active-Bridge Multilevel Inverter Based on Conservative Power Theory

Energies ◽  
2020 ◽  
Vol 13 (11) ◽  
pp. 2951 ◽  
Author(s):  
Azuwien Aida Bohari ◽  
Hui Hwang Goh ◽  
Agustiono Kurniawan Tonni ◽  
Sze Sing Lee ◽  
Sy Yi Sim ◽  
...  
Keyword(s):  
Power Control ◽  
Reactive Power ◽  
Direct Power ◽  
Direct Power Control ◽  
Current Harmonics ◽  
Dual Active Bridge ◽  
Active And Reactive Power ◽  
Unbalanced Grid ◽  
Conservative Power Theory ◽  
Conservative Power

This paper explores the feasibility of multilevel dual-active bridge-inverter (DABMI) applications for grid-connected applications of a modern Model of Predictive Direct Power Control (MPDPC) based on the conservative power theory (CPT). In the case of unbalanced grid voltages, the objective of the study is to promote continued active and reactive energy in MPDPC without reducing efficiency such as transient response and current harmonics. The nature of the instantaneous p-q theory permits only one out of three control targets to be fulfilled. The proposed control approached directly regulates the instantaneous active and reactive power to achieve three particular control objectives namely sinusoidal and symmetrical grid current, cancelling twice of fundamental grid frequency reactive power ripples, and removing twice grid frequency active power ripple. The techniques of complicated Grid part sequence extraction are unnecessary and improved at no extra expense, as is the case with current MPDPC fault-tolerant approaches. The instantaneous power at the next sampling instant is predicted with the newly developed discrete-time model. Each possible switching state will then be evaluated in the cost function defined until the optimal state which lead to the minimum power errors is determined. In MATLAB/Simulink simulation, the proposed CPT-based MPDPC measures reliability and performance at balanced and unbalanced grid voltages then compared with the conventional and existing MPDPC The proposed method manages to achieve all of three control targets which generates sinusoidal grid currents and attenuates active and reactive power ripple of twice the grid frequency exactly at the same time without losing its critical efficiency including transient reaction and current harmonics.

scholarly journals Instantaneous Active and Reactive Power Control Using Direct Power Control Strategy for Multilevel Multistring Inverter Fed Photovoltaic System

2021 ◽  
Vol 54 (1) ◽  
pp. 139-146
Author(s):  
Balamurugan Manoharan ◽  
Sarat Kumar Sahoo
Keyword(s):  
Power Control ◽  
Real Time ◽  
Reactive Power ◽  
Photovoltaic System ◽  
Switching Frequency ◽  
Direct Power ◽  
Pv System ◽  
Direct Power Control ◽  
Detailed Model ◽  
Active And Reactive Power

This paper presents the Direct Power Control (DPC) strategy for Multilevel Multistring Inverter fed Photovoltaic (PV) system to control the instantaneous active and reactive power. The proposed system consists of PV strings, boost converter and three phase three level cascaded H-bridge (CHB) inverter. In multistring topology, each PV string is connected to the dc/dc converter and the distributed MPPT control algorithm is connected to the central inverter. The Space Vector Modulation (SVM) based DPC approach is used to obtain the constant switching frequency and reduced power ripple. The detailed model of the proposed system is developed in Matlab to evaluate the performance. A laboratory based prototype of the proposed system is developed to realize the system in real time. dSPACE DS1103 is used as the control interface to perform the real time implementation (RTI). Power Quality Analyser (PQ-Box 200) is used to analyse the system parameters like voltage, current and Total Harmonic Distortion (THD) of inverter. The effectiveness of the proposed system has been validated with the help of simulation and the experimental results.

scholarly journals Three-phase power factor corrector with direct power control and power supply of the unbalanced industrial network

2019 ◽  
Vol 124 ◽  
pp. 05017
Author(s):  
D.A. Sorokin ◽  
S.I. Volskiy ◽  
Y.Y. Skorokhod
Keyword(s):  
Power Control ◽  
Power Factor ◽  
Electrical Energy ◽  
Input Voltage ◽  
Direct Power ◽  
Direct Power Control ◽  
Three Phase ◽  
Power Loss Reduction ◽  
Industrial Network ◽  
Harmonic Composition

Nowadays three-phase power factor correctors (PFC) became widely used. This is dictated by strict requirements of the international electrical technical commission standards to harmonic composition of current supplied by three-phase industrial network. New schematic technical version of three-phase PFC having direct power control and improved efficiency factor is presented. Mathematical description of power component and control system taking in account its functioning depending upon asymmetrical three-phase input voltage was fulfilled. The electrical processes in the presented PFC was analysed by means of computer simulation. The obtained results are of interest to the persons engaged in the development of electrical energy systems and complexes to which higher requirements in respect to power loss reduction and reliable functioning in case of three-phase asymmetrical industrial network are imposed.

A power quality enhanced grid voltage sensorless predictive direct power control for active front end rectifiers

2017 ◽  
Vol 40 (13) ◽  
pp. 3809-3823 ◽  
Author(s):  
Amit Kumar ◽  
Gopalakrishna Srungavarapu
Keyword(s):  
Power Control ◽  
Power Quality ◽  
Pulse Width Modulation ◽  
Reactive Power ◽  
Research Work ◽  
Switching Frequency ◽  
Direct Power ◽  
Direct Power Control ◽  
Grid Voltage ◽  
Bus Voltage

In this research work, a power quality enhanced grid voltage sensorless deadbeat predictive direct power control (DB-DPC) approach for AC/DC power converters based on latest virtual flux (VF) estimation, DB-DPC and space vector pulse width modulation (SVPWM) is proposed. At first, the grid voltage sensorless technique with switching table based DPC, which is a conventional approach, is discussed and its performance is analyzed under both increase of load as well as decrease of load conditions. Further, the proposed technique performance is also analyzed under the same circumstance and its performance is compared with the traditional method. The proposed technique has numerous advantages over the conventional method such as constant switching frequency, better active and reactive power control, good regulation of dc bus voltage, and enhanced power quality performance. As the proposed approach utilizes VF, DB-PC, and SVPWM techniques, this ensure line voltage sensorless approach, excellent control dynamics and constant switching frequency, respectively. At the end, experimental validation is done to confirm the supremacy of the proposed technique under load varying conditions and has a phenomenal performance under these circumstances.

scholarly journals Virtual Flux Predictive Direct Power Control of Five-level T-type Multi-terminal VSC-HVDC System

2020 ◽  
Vol 64 (2) ◽  
pp. 133-143
Author(s):  
Ahmed Reguig Berra ◽  
Said Barkat ◽  
Mansour Bouzidi
Keyword(s):  
Power Control ◽  
Reactive Power ◽  
Operating Conditions ◽  
Voltage Source ◽  
Voltage Source Converter ◽  
Switching Frequency ◽  
Direct Power ◽  
Direct Power Control ◽  
Active And Reactive Power ◽  
Virtual Flux

This paper proposes a Virtual Flux Predictive Direct Power Control (PDPC) for a five-level T-type multi-terminal Voltage Source Converter High Voltage Direct Current (VSC-HVDC) transmission system. The proposed PDPC scheme is based on the computation of the average voltage vector using a virtual flux predictive control algorithm, which allows the cancellation of active and reactive power tracking errors at each sampling period. The active and reactive power can be estimated based on the virtual flux vector that makes AC line voltage sensors not necessary. A constant converter switching frequency is achieved by employing a multilevel space vector modulation, which ensures the balance of the DC capacitor voltages of the five-level t-type converters as well. Simulation results validate the efficiency of the proposed control law, and they are compared with those given by a traditional direct power control. These results exhibit excellent transient responses during range of operating conditions.

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