Power Control of a Three-phase Grid-connected Inverter using a Time-Domain Symmetrical Components Extraction Method under Unbalanced Conditions

2021 ◽  
Author(s):  
Mohammad Alathamneh ◽  
Xingyu Yang ◽  
R. M. Nelms ◽  
Saad Al-Gahtani
Keyword(s):  
Power Control ◽  
Time Domain ◽  
Extraction Method ◽  
Symmetrical Components ◽  
Three Phase ◽  
Grid Connected Inverter

Operation and Startup of Three-Phase Grid-Connected PWM Inverter for an Experimental Test Bench With DSPACE Real-Time Implementation of PQ Control

2022 ◽  
pp. 207-232
Author(s):  
Kamal Elyaalaoui ◽  
Moussa Labbadi ◽  
Khalid Chigane ◽  
Mohammed Ouassaid ◽  
Mohamed Cherkaoui
Keyword(s):  
Power Control ◽  
Real Time ◽  
Experimental Test ◽  
Control Strategy ◽  
Test Bench ◽  
Experimental Results ◽  
Electrical Network ◽  
Three Phase ◽  
Grid Connected Inverter ◽  
Experimental Test Bench

The main objective of this chapter is the experimental validation of active and reactive power control at the connection point for a three-phase grid connected inverter. It gives an overview on the adopted vector control strategy, regulation of the angle of orientation of the blades (pitch control), synchronization grid side converter to the power network using phase closed loop (PLL). Once the experimental test bench is described, the authors devote a first part to the design of the block circuit diagram of the experimental platform and the control strategy implemented in the DSPace DS1104, and they suggest some steps to associate the inverter to the electrical network. Subsequently, they discuss the experimental results validating the proposed power control. The purpose of this experimental results is the DSPACE real-time implementation of PQ control using three-phase inverter and development of a startup algorithm of the experimental test bench.

Dynamic Response Improvement of the DPC-SVM Three-Phase Grid-Connected Inverter

2013 ◽  
Vol 732-733 ◽  
pp. 1251-1254
Author(s):  
Zhi Lei Yao ◽  
Lan Xiao ◽  
Jing Xu
Keyword(s):  
Theoretical Analysis ◽  
Dynamic Response ◽  
Power Control ◽  
Experimental Results ◽  
Space Vector Modulation ◽  
Control Methods ◽  
Direct Power ◽  
Three Phase ◽  
Grid Connected Inverter ◽  
Vector Modulation

As the dynamic response of the traditional direct power control using space vector modulation (DPC-SVM) is slow, an improved DPC-SVM for the three-phase grid-connected inverter is proposed. The feed-forward reference powers are used to improve the dynamic response. The operating principles of the traditional and improved DPC-SVMs are illustrated. Experimental results of a 15-kVA three-phase grid-connected inverter with the traditional and improved control methods verify the theoretical analysis.

scholarly journals The direct power control of three-phase AC-DC converter under unbalance voltage condition

2019 ◽  
Vol 9 (6) ◽  
pp. 5107 ◽  
Author(s):  
Nor Azizah Yusoff ◽  
Azziddin M. Razali ◽  
Kasrul Abdul Karim ◽  
Auzani Jidin
Keyword(s):  
Power Control ◽  
Harmonic Distortion ◽  
Integrated Approach ◽  
Phase System ◽  
Direct Power ◽  
Direct Power Control ◽  
Symmetrical Components ◽  
Supply Condition ◽  
Three Phase ◽  
Unbalance Voltage

This paper has presents the integrated approach for three-phase PWM AC-DC converter for obtaining the symmetrical components under unbalanced supply condition. The input structures for conventional direct power control have been modified with three simpler sequence networks instead it coupled by a detailed three-phase system method. In the cases of an unbalanced three-phase system, it causes the presence of unbalanced current and voltages thus produce the negative components on the grid voltage. Otherwise, the unbalance voltage in a three-phase power system causes severe performance degradation of a grid-connected VSI. Therefore, the imbalance voltage can be resolved by separating from the individual elements of voltage and current into symmetrical components called as a sequencing network. Consequently, the input power is relatively improved during unbalanced condition. It proven through the measurement of Total Harmonic Distortion (THD) from the conventional direct power control in individual elements is much higher compared than it resolved in separate components. Therefore, three symmetrical components are necessary for imbalance supply condition to obtaining almost sinusoidal grid currents.

Model predictive flexible power control for grid-connected inverter under unbalanced network

2020 ◽  
Vol 13 (16) ◽  
pp. 3580-3589 ◽  
Author(s):  
Bihua Hu ◽  
Zhiyong Chen ◽  
Zhi Zhang ◽  
Siyan Liu ◽  
Wenlang Deng
Keyword(s):  
Power Control ◽  
Grid Connected Inverter ◽  
Unbalanced Network

scholarly journals Analysis of Three-Phase Wye-Delta Connected LLC

Energies ◽  
2021 ◽  
Vol 14 (12) ◽  
pp. 3606
Author(s):  
Jing-Yuan Lin ◽  
Chuan-Ting Chen ◽  
Kuan-Hung Chen ◽  
Yi-Feng Lin
Keyword(s):  
Frequency Domain ◽  
Time Domain ◽  
Operation Time ◽  
Time Domain Analysis ◽  
Domain Analysis ◽  
Frequency Domain Analysis ◽  
Complete Analysis ◽  
Plane Analysis ◽  
Analysis Methods ◽  
Three Phase

Three-phase wye–delta LLC topology is suitable for voltage step down and high output current, and has been used in the industry for some time, e.g., for server power and EV charger. However, no comprehensive circuit analysis has been performed for three-phase wye–delta LLC. This paper provides complete analysis methods for three-phase wye–delta LLC. The analysis methods include circuit operation, time domain analysis, frequency domain analysis, and state–plane analysis. Circuit operation helps determine the circuit composition and operation sequence. Time domain analysis helps understand the detail operation, equivalent circuit model, and circuit equation. Frequency domain analysis helps obtain the curve of the transfer function and assists in circuit design. State–plane analysis is used for optimal trajectory control (OTC). These analyses not only can calculate the voltage/current stress, but can also help design three-phase wye-delta connected LLC and provide the OTC control reference. In addition, this paper uses PSIM simulation to verify the correctness of analysis. At the end, a 5-kW three-phase wye–delta LLC prototype is realized. The specification of the prototype is a DC input voltage of 380 V and output voltage/current of 48 V/105 A. The peak efficiency is 96.57%.

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