Design of voltage and current controller parameters using small signal model-based pole-zero cancellation method for improved transient response in microgrids
Abstract Microgrids are supposed to provide stable power for seamless utility-grid interaction under all conditions as stated by IEEE-1547 standard. But, the use of power electronic inverter makes the microgrid sensitive to transients than synchronous generator-based plants. This degrades the voltag...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
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Springer
2021-10-01
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| Series: | SN Applied Sciences |
| Subjects: | |
| Online Access: | https://doi.org/10.1007/s42452-021-04815-x |
| _version_ | 1818930252695470080 |
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| author | Y. V. Pavan Kumar Ravikumar Bhimasingu |
| author_facet | Y. V. Pavan Kumar Ravikumar Bhimasingu |
| author_sort | Y. V. Pavan Kumar |
| collection | DOAJ |
| description | Abstract Microgrids are supposed to provide stable power for seamless utility-grid interaction under all conditions as stated by IEEE-1547 standard. But, the use of power electronic inverter makes the microgrid sensitive to transients than synchronous generator-based plants. This degrades the voltage/frequency responses during transients, which can lead to transient stability problem if not controlled properly. Hence, the design of effective closed-loop voltage and current (V/I) controllers is highly desired to control the inverter output against the disturbances. The V/I controllers are based on PI (proportional-cum-integral) formulas. Thus, the effectiveness of V/I controllers relies on how accurate that their gain parameters are tuned. Many PI-tuning methods have been developed in the literature, but, it is yet difficult to identify a suitable method for an application. Also, only a few researchers have focused on the microgrids due to the complexity involved in its controller design by the presence of V/I cascaded dual-loop. Hence, to address this problem, this paper proposes a novel way of designing V/I controller parameters by using pole-zero cancellation method. This method is implemented by deriving the microgrid’s small-signal model. This improves the transient response through reduced system order and/or alleviated sluggish/marginal-stable/unstable poles by adding zeros at same places where those poles are laid, to in effect cancel them. The efficacy of the proposed method over existing methods is assessed by plotting frequency and voltage responses under different test conditions. From the simulation results, it is witnessed that the proposed method relatively improved the transient characteristics of microgrids. Article Highlights Analyzes the applicability of conventional PI tuning methods for microgrid controllers’ design. Proposes a novel small signal model based pole-zero cancellation method for the design of microgrid controllers. Enhances the gain margin, which improves the stabilization capacity of the system when subjected to disturbances. Improves the transient behavior of frequency and voltage responses, which ensure the safety of sensitive loads. |
| first_indexed | 2024-12-20T03:57:45Z |
| format | Article |
| id | doaj.art-4008abcbc82d464e9e6f3f04ea534157 |
| institution | Directory Open Access Journal |
| issn | 2523-3963 2523-3971 |
| language | English |
| last_indexed | 2024-12-20T03:57:45Z |
| publishDate | 2021-10-01 |
| publisher | Springer |
| record_format | Article |
| series | SN Applied Sciences |
| spelling | doaj.art-4008abcbc82d464e9e6f3f04ea5341572022-12-21T19:54:15ZengSpringerSN Applied Sciences2523-39632523-39712021-10-0131111710.1007/s42452-021-04815-xDesign of voltage and current controller parameters using small signal model-based pole-zero cancellation method for improved transient response in microgridsY. V. Pavan Kumar0Ravikumar Bhimasingu1School of Electronics Engineering, VIT-AP UniversityDepartment of Electrical Engineering, Indian Institute of Technology Hyderabad (IITH)Abstract Microgrids are supposed to provide stable power for seamless utility-grid interaction under all conditions as stated by IEEE-1547 standard. But, the use of power electronic inverter makes the microgrid sensitive to transients than synchronous generator-based plants. This degrades the voltage/frequency responses during transients, which can lead to transient stability problem if not controlled properly. Hence, the design of effective closed-loop voltage and current (V/I) controllers is highly desired to control the inverter output against the disturbances. The V/I controllers are based on PI (proportional-cum-integral) formulas. Thus, the effectiveness of V/I controllers relies on how accurate that their gain parameters are tuned. Many PI-tuning methods have been developed in the literature, but, it is yet difficult to identify a suitable method for an application. Also, only a few researchers have focused on the microgrids due to the complexity involved in its controller design by the presence of V/I cascaded dual-loop. Hence, to address this problem, this paper proposes a novel way of designing V/I controller parameters by using pole-zero cancellation method. This method is implemented by deriving the microgrid’s small-signal model. This improves the transient response through reduced system order and/or alleviated sluggish/marginal-stable/unstable poles by adding zeros at same places where those poles are laid, to in effect cancel them. The efficacy of the proposed method over existing methods is assessed by plotting frequency and voltage responses under different test conditions. From the simulation results, it is witnessed that the proposed method relatively improved the transient characteristics of microgrids. Article Highlights Analyzes the applicability of conventional PI tuning methods for microgrid controllers’ design. Proposes a novel small signal model based pole-zero cancellation method for the design of microgrid controllers. Enhances the gain margin, which improves the stabilization capacity of the system when subjected to disturbances. Improves the transient behavior of frequency and voltage responses, which ensure the safety of sensitive loads.https://doi.org/10.1007/s42452-021-04815-xMicrogridsVoltage controllerCurrent controllerPI tuningSmall-signal modelTransient response |
| spellingShingle | Y. V. Pavan Kumar Ravikumar Bhimasingu Design of voltage and current controller parameters using small signal model-based pole-zero cancellation method for improved transient response in microgrids SN Applied Sciences Microgrids Voltage controller Current controller PI tuning Small-signal model Transient response |
| title | Design of voltage and current controller parameters using small signal model-based pole-zero cancellation method for improved transient response in microgrids |
| title_full | Design of voltage and current controller parameters using small signal model-based pole-zero cancellation method for improved transient response in microgrids |
| title_fullStr | Design of voltage and current controller parameters using small signal model-based pole-zero cancellation method for improved transient response in microgrids |
| title_full_unstemmed | Design of voltage and current controller parameters using small signal model-based pole-zero cancellation method for improved transient response in microgrids |
| title_short | Design of voltage and current controller parameters using small signal model-based pole-zero cancellation method for improved transient response in microgrids |
| title_sort | design of voltage and current controller parameters using small signal model based pole zero cancellation method for improved transient response in microgrids |
| topic | Microgrids Voltage controller Current controller PI tuning Small-signal model Transient response |
| url | https://doi.org/10.1007/s42452-021-04815-x |
| work_keys_str_mv | AT yvpavankumar designofvoltageandcurrentcontrollerparametersusingsmallsignalmodelbasedpolezerocancellationmethodforimprovedtransientresponseinmicrogrids AT ravikumarbhimasingu designofvoltageandcurrentcontrollerparametersusingsmallsignalmodelbasedpolezerocancellationmethodforimprovedtransientresponseinmicrogrids |