Improved Control Strategy Of Grid Forming Inverters For Fault Ride Through In A Microgrid System Preprint
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Improved Control Strategy Of Grid Forming Inverters For Fault Ride Through In A Microgrid System Preprint
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Author :
language : en
Publisher:
Release Date : 2022
Improved Control Strategy Of Grid Forming Inverters For Fault Ride Through In A Microgrid System Preprint written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2022 with categories.
This paper develops improved control strategy of GFM inverter with fault ride-through (FRT) capabilities to guarantee stable operation of microgrid under fault conditions especially islanded microgrid and asymmetrical faults. The proposed control strategy includes dual control of positive-sequence and negative-sequence control, and the adaptive virtual impedance (VI) control. Unlike the existing works, the proposed strategy only applies the VI control for the d-component of the positive-sequence control and leaves the q-component of positive-sequence control and dq-component of negative-sequence control zero, thus achieving the improved stability and balanced three-phase voltage under asymmetrical faults. The adaptive feature of the VI control guarantees the stability of the GFM inverter under severe faults which could cause saturated inner current loop and instability if the VI is not adaptive. Simulation results of a phase-to-phase-ground fault show that the proposed control strategy improves the stability of GFM and achieves the stable and balanced output voltages in islanded microgrid.
Improved Control Strategy Of Grid Forming Inverters For Fault Ride Through In A Microgrid System
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Author :
language : en
Publisher:
Release Date : 2022
Improved Control Strategy Of Grid Forming Inverters For Fault Ride Through In A Microgrid System written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2022 with categories.
This paper develops an improved control strategy of grid-forming (GFM) inverters with fault ride-through (FRT) capabilities to guarantee the stable operation of microgrids under fault conditions, especially islanded microgrids and asymmetrical faults. The proposed control strategy includes the dual control of positive-sequence and negative-sequence control as well as the adaptive virtual impedance (VI) control. Unlike existing works, the proposed strategy applies the VI control for only the d component of the positive-sequence control and leaves the q component of the positive-sequence control and the dq component of the negative-sequence control as zero, thus achieving improved stability and balanced three-phase voltages under asymmetrical faults. The adaptive feature of the VI control guarantees the stability of the GFM inverter under severe faults, which could cause the saturation of the inner current loop, and the instability if the VI is not adaptive. Simulation results of various unbalanced faults with high and low fault impedances show that the proposed control strategy improves the stability of the GFM inverter and achieves stable and balanced output voltages in islanded microgrids. And the algorithm also improves the stability of GFM inverters under balanced faults with high and low fault impedances.
Design Power Control Strategies Of Grid Forming Inverters For Microgrid Application Preprint
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Author :
language : en
Publisher:
Release Date : 2021
Design Power Control Strategies Of Grid Forming Inverters For Microgrid Application Preprint written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2021 with categories.
This paper compares two control schemes in the application control layer of a non-PLL grid-forming (GFM) inverter to gain the insights and understanding of how the two schemes affect the dynamic responses of the GFM inverters and the transition operation of microgrids. Both schemes can achieve smooth microgrid transition operation and power tracking, however, the first scheme expects to exhibit more transients due to the feedforward of the inverse dynamic model of the output filter. Simulation results show that both control schemes achieve successful transition operation with smooth transients, and the second control scheme exhibits slightly better transients in the system frequency during islanding operation and the first one has slightly superior transients in the system frequency during reconnection operation. The power tracking performance in the grid-connected mode is evaluated, which shows that the first scheme has better active power tracking and the second one has better reactive power tracking. The analysis and results are useful to develop reliable control schemes for non-PLL GFM inverters because more and more inverters will work as non-PLL grid-forming sources in the future grids due to better stability and reliability.
Study Of Inverter Control Strategies On The Stability Of Low Inertia Microgrid Systems Preprint
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Author :
language : en
Publisher:
Release Date : 2022
Study Of Inverter Control Strategies On The Stability Of Low Inertia Microgrid Systems Preprint written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2022 with categories.
This paper investigates the stability of low-inertia microgrid systems with two control strategies that have different percentages of grid-forming (GFM) inverters. The first control strategy has approximately 50% GFM inverters, and all the battery inverters are working in GFM control mode. Originally, the second control strategy has approximately 10% GFM inverters, with only two battery inverters working in GFM control mode and the rest working in grid-following (GFL) PQ control mode based on current control, which cannot stabilize the microgrid system. Then, the second control strategy is modified to change the GFM inverters from droop control to isochronous control and the GFL battery inverters from traditional current control to voltage control for power control. Both control strategies can maintain system stability; however, the first control strategy can better handle contingency events. The study indicates that 1) a microgrid system with a higher percentage of GFM inverters has better stability; and 2) a microgrid with a lower percentage of GFM inverters can have poor stability, but improved control strategies in inverters can improve system stability. This study improves the understanding of how different percentages of GFM inverters and inverter control strategies affect the system stability of low-inertia microgrids.
Study Of Inverter Control Strategies On The Stability Of Low Inertia Microgrid Systems
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Author :
language : en
Publisher:
Release Date : 2022
Study Of Inverter Control Strategies On The Stability Of Low Inertia Microgrid Systems written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2022 with categories.
This paper investigates the stability of low-inertia microgrid systems with two control strategies that have different percentages of grid-forming (GFM) inverters. The first control strategy has approximately 50% GFM inverters, and all the battery inverters are working in GFM control mode. Originally, the second control strategy has approximately 10% GFM inverters, with only two battery inverters working in GFM control mode and the rest working in grid-following (GFL) PQ control mode based on current control, which cannot stabilize the microgrid system. Then, the second control strategy is modified to change the GFM inverters from droop control to isochronous control and the GFL battery inverters from traditional current control to voltage control for power control. Both control strategies can maintain system stability; however, the first control strategy can better handle contingency events. The study indicates that 1) a microgrid system with a higher percentage of GFM inverters has better stability; and 2) a microgrid with a lower percentage of GFM inverters can have poor stability, but improved control strategies in inverters can improve system stability. This study improves the understanding of how different percentages of GFM inverters and inverter control strategies affect the system stability of low-inertia microgrids.
Design Power Control Strategies Of Grid Forming Inverters For Microgrid Application
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Author : Jing Wang (Architectural engineer)
language : en
Publisher:
Release Date : 2021
Design Power Control Strategies Of Grid Forming Inverters For Microgrid Application written by Jing Wang (Architectural engineer) and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2021 with Electric inverters categories.
Novel Hybrid Current Limiter For Grid Forming Inverter Control During Unbalanced Faults Preprint
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Author :
language : en
Publisher:
Release Date : 2023
Novel Hybrid Current Limiter For Grid Forming Inverter Control During Unbalanced Faults Preprint written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2023 with categories.
Grid-forming (GFM) inverter controls have illustrated many desirable features to enable bulk integration of renewable sources into the future power grid. However, the performance of GFM inverters during unbalanced faults remains under-explored. In this paper, a novel current-limiting method is proposed for GFM inverters to handle unbalanced fault conditions while providing voltage support to the main grid. The proposed current limiter combines concepts of dynamic virtual-impedance and current-reference saturation limiting, all built-up in the stationary reference frame to achieve improved current-limiting performance under unbalanced load/fault conditions. System-wide full-order transient simulations with multiple GFM inverters demonstrate the potential of the method and benchmark the performance against state-of-the-art current limiters. Simulation results portray improved voltage balancing performance of the proposed method compared to both current-reference saturation and virtual-impedance limiting.
Integrated Synchronization Control Of Grid Forming Inverters For Smooth Microgrid Transition Preprint
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Author :
language : en
Publisher:
Release Date : 2019
Integrated Synchronization Control Of Grid Forming Inverters For Smooth Microgrid Transition Preprint written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019 with categories.
This paper develops an integrated synchronization control technique for a grid-forming inverter operating within a microgrid that can improve the microgrid's transients during microgrid transition operation. This integrated synchronization control includes the disconnection synchronization control and the reconnection synchronization control. The simulation results show that the developed synchronization control works effectively to smooth the angle change of the grid-forming inverter during microgrid transition operation. Thus, the microgrid's transients are significantly improved compared to the case without synchronization control.
Design Power Control Strategies Of Grid Forming Inverters For Microgrid Application Preprint
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Author : Jing Wang
language : en
Publisher:
Release Date : 2021
Design Power Control Strategies Of Grid Forming Inverters For Microgrid Application Preprint written by Jing Wang and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2021 with Electric power distribution categories.
Grid Fault Ride Through Capability Of Voltage Controlled Inverters For Distributed Generation Applications
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Author : Prasanna Piya
language : en
Publisher:
Release Date : 2017
Grid Fault Ride Through Capability Of Voltage Controlled Inverters For Distributed Generation Applications written by Prasanna Piya and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017 with categories.
The increased integration of distributed and renewable energy resources (DERs) has motivated the evolution of new standards in grid interconnection requirements. New standards have the requirement for the DERs to remain connected during the transient grid fault conditions and to offer support to the grid. This requirement is known as the fault ride-through (FRT) capability of the inverter-based DERs and is an increasingly important issue. This dissertation presents the FRT capability of the DERs that employ a voltage control strategy in their control systems. The voltage control strategy is increasingly replacing the current control strategy in the DERs due to the fact that it provides direct voltage support. However, the voltage control technique limits the ability of direct control over the inverter current. This presents a challenge in addressing the FRT capability where the problem is originally formulated in terms of the current control. This dissertation develops a solution for the FRT capability of inverters that use a voltage control strategy. The proposed controller enables the inverter to ride through the grid faults and support the grid by injecting a balanced current with completely controlled real and reactive power components. The proposed controller is flexible and can be used in connection with various voltage control strategies. Stability analysis of the proposed control structure is performed based on a new linear time-invariant model developed in this dissertation. This model significantly facilitates the stability and design of such control loops. Detailed simulation, real-time and experimental results are presented to evaluate the performance of the proposed control strategy in various operating conditions. Desirable transient and steady-state responses of the proposed controller are observed. Furthermore, the newly established German and Danish grid fault ride-through standards are implemented in this research as two application examples and the effectiveness of the dissertation results are illustrated in the context of those two examples.