A dq-Domain Impedance Measurement Methodology for Three-Phase Converters in Distributed Energy Systems
A distributed energy system (DES) using controlled power electronics converters delivers power to loads, via conventional, as well as a number of renewable, energy sources. However, stability concerns retard the integration of power electronics converters into an existing DES. Therefore, due to the...
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| Format: | Article |
| Language: | English |
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MDPI AG
2018-10-01
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| Series: | Energies |
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| Online Access: | http://www.mdpi.com/1996-1073/11/10/2732 |
| _version_ | 1798040259605299200 |
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| author | Muhammad Saad Husan Ali Huamei Liu Shahbaz Khan Haider Zaman Bakht Muhammad Khan Du Kai Ju Yongfeng |
| author_facet | Muhammad Saad Husan Ali Huamei Liu Shahbaz Khan Haider Zaman Bakht Muhammad Khan Du Kai Ju Yongfeng |
| author_sort | Muhammad Saad |
| collection | DOAJ |
| description | A distributed energy system (DES) using controlled power electronics converters delivers power to loads, via conventional, as well as a number of renewable, energy sources. However, stability concerns retard the integration of power electronics converters into an existing DES. Therefore, due to the high penetration of power converters, the overall network analysis of DES is becoming increasingly difficult. Impedance-based DES modeling emerged as an effective technique as it reduces the system into source and load subsystems and offers easier analysis of the dynamic interactions between them. These models can be obtained using either analytical calculations, simulations, or experimental measurements. In this work, firstly, a line-to-line current injection technique is used for the measurement of alternating current (AC) impedances. Since it requires repeated injections, a d q -domain impedance measurement methodology based upon a set of independent perturbations and measurements is proposed. The perturbation is injected via a sweep signal which is preprocessed by the digital signal processor (DSP) prior to injection. The d q reference frame is synchronized with the three-phase AC system using a low-bandwidth phase-locked loop (PLL). The close matching of impedance parameters measured in simulation using the proposed approach with those obtained using analytical expressions and the line-to-line current injection technique verifies the effectiveness of the approach. Furthermore, the method was also implemented experimentally, and the close matching of the results with the analytical and simulation results validates the overall modeling and measurement procedure. |
| first_indexed | 2024-04-11T22:05:00Z |
| format | Article |
| id | doaj.art-44bf3c44ca274a7598dc60a69c5f9df6 |
| institution | Directory Open Access Journal |
| issn | 1996-1073 |
| language | English |
| last_indexed | 2024-04-11T22:05:00Z |
| publishDate | 2018-10-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Energies |
| spelling | doaj.art-44bf3c44ca274a7598dc60a69c5f9df62022-12-22T04:00:44ZengMDPI AGEnergies1996-10732018-10-011110273210.3390/en11102732en11102732A dq-Domain Impedance Measurement Methodology for Three-Phase Converters in Distributed Energy SystemsMuhammad Saad0Husan Ali1Huamei Liu2Shahbaz Khan3Haider Zaman4Bakht Muhammad Khan5Du Kai6Ju Yongfeng7Department of Automation, School of Electronic and Control Engineering, Chang’an University, Xi’an 710072, ChinaDepartment of Electrical Engineering, School of Automation, Northwestern Polytechnical University, Xi’an 710129, ChinaDepartment of Electrical Engineering, School of Automation, Northwestern Polytechnical University, Xi’an 710129, ChinaDepartment of Electrical Engineering, School of Automation, Northwestern Polytechnical University, Xi’an 710129, ChinaDepartment of Electrical Engineering, School of Automation, Northwestern Polytechnical University, Xi’an 710129, ChinaDepartment of Electrical Engineering, School of Automation, Northwestern Polytechnical University, Xi’an 710129, ChinaDepartment of Automation, School of Electronic and Control Engineering, Chang’an University, Xi’an 710072, ChinaDepartment of Automation, School of Electronic and Control Engineering, Chang’an University, Xi’an 710072, ChinaA distributed energy system (DES) using controlled power electronics converters delivers power to loads, via conventional, as well as a number of renewable, energy sources. However, stability concerns retard the integration of power electronics converters into an existing DES. Therefore, due to the high penetration of power converters, the overall network analysis of DES is becoming increasingly difficult. Impedance-based DES modeling emerged as an effective technique as it reduces the system into source and load subsystems and offers easier analysis of the dynamic interactions between them. These models can be obtained using either analytical calculations, simulations, or experimental measurements. In this work, firstly, a line-to-line current injection technique is used for the measurement of alternating current (AC) impedances. Since it requires repeated injections, a d q -domain impedance measurement methodology based upon a set of independent perturbations and measurements is proposed. The perturbation is injected via a sweep signal which is preprocessed by the digital signal processor (DSP) prior to injection. The d q reference frame is synchronized with the three-phase AC system using a low-bandwidth phase-locked loop (PLL). The close matching of impedance parameters measured in simulation using the proposed approach with those obtained using analytical expressions and the line-to-line current injection technique verifies the effectiveness of the approach. Furthermore, the method was also implemented experimentally, and the close matching of the results with the analytical and simulation results validates the overall modeling and measurement procedure.http://www.mdpi.com/1996-1073/11/10/2732AC impedancedistributed energy systemshunt current injectiondq domainmeasurement |
| spellingShingle | Muhammad Saad Husan Ali Huamei Liu Shahbaz Khan Haider Zaman Bakht Muhammad Khan Du Kai Ju Yongfeng A dq-Domain Impedance Measurement Methodology for Three-Phase Converters in Distributed Energy Systems Energies AC impedance distributed energy system shunt current injection dq domain measurement |
| title | A dq-Domain Impedance Measurement Methodology for Three-Phase Converters in Distributed Energy Systems |
| title_full | A dq-Domain Impedance Measurement Methodology for Three-Phase Converters in Distributed Energy Systems |
| title_fullStr | A dq-Domain Impedance Measurement Methodology for Three-Phase Converters in Distributed Energy Systems |
| title_full_unstemmed | A dq-Domain Impedance Measurement Methodology for Three-Phase Converters in Distributed Energy Systems |
| title_short | A dq-Domain Impedance Measurement Methodology for Three-Phase Converters in Distributed Energy Systems |
| title_sort | dq domain impedance measurement methodology for three phase converters in distributed energy systems |
| topic | AC impedance distributed energy system shunt current injection dq domain measurement |
| url | http://www.mdpi.com/1996-1073/11/10/2732 |
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