Adaptive controller based on grid impedance estimation for stable operation of grid‐connected inverters under weak grid conditions

Temiz, Hakan; Keysan, Ozan; Demirok, Erhan

doi:10.1049/iet-pel.2019.1411

Cited by 10 publications

(9 citation statements)

References 43 publications

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“…Noted that, due to F ue < 0, two eigenvalues in (11) are opposite, that is, α 2 > 0, α 1 < 0. It means that (δ ue , 0) is a saddle point with two asymptotic lines in the phase plane, whose slope is determined by the eigenvectors.…”

Section: Transient Instability Analysismentioning

confidence: 99%

“…wileyonlinelibrary.com/iet-pel non-linear part in the VSG control around the equilibrium point. Previously, the small-signal analysis of VSG is well documented, including the eigenvalue analysis and the impedance analysis [11,12] etc. On the other hand, the latter refers to the ability to experience the transient dynamics from the initial operation point to another one after subjected to large disturbances, such as grid faults.…”

Section: Introductionmentioning

confidence: 99%

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Improved active power control of virtual synchronous generator for enhancing transient stability

Cheng

Wang

et al. 2022

IET Power Electronics

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Virtual synchronous generators (VSGs) are widely used as grid‐forming control converters in the inverter‐dominated power system. Similar to synchronous generators (SGs), there would also be transient instability of VSGs under certain conditions. In this paper, the transient dynamics of VSGs during gird faults are fully investigated based on the large‐signal model. It is revealed that the significant deteriorative of active power control loop (APCL) is the main factor on the transient stability of VSGs. Thus, for enhancing transient stability during grid faults, an integrator‐based feedback loop is introduced for APCL. Then, an enhanced active power control of VSGs is presented with transient stability enhancement during grid faults. Moreover, the impacts of different integral parameters on the transient stability of VSGs are studied. Finally, the validity of the transient stability enhancement of VSGs is demonstrated by the hardware‐in‐loop (HIL) results.

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Section: Transient Instability Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Improved active power control of virtual synchronous generator for enhancing transient stability

Cheng

Wang

et al. 2022

IET Power Electronics

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“…Both T L and B are unknown variables. The former ranges from 0 to the maximum output, and the latter can be estimated via adaptive control [28,29]. The motor dynamics are performed using both the voltage and the current of motor, as presented in Equation (3).…”

Section: System Modelingmentioning

confidence: 99%

Design and Analysis of an Active Disturbance Rejection Robust Adaptive Control System for Electromechanical Actuator

Chen

Zhu

et al. 2021

Actuators

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Airline electromechanical actuators (EMAs), on the task of controlling flight surfaces, hold a great promise with the development of more- and all-electric aircraft. Notwithstanding, the deficiencies in both robustness and adaptability of control algorithms prevent EMAs from extensive use. However, the state-of-the-art control schemes fail to precisely compensate the system nonlinear uncertainties of servo control. In this paper, from the innovation point of view, we tend to put forward the foundation of devising an active disturbance rejection robust adaptive control (ADRRAC) strategy, whose main purpose is to deal with the position servo control of EMA. Specifically, an adaptive control law is designed and deployed for resolving not only the nonlinear disturbance, but also the parameter uncertainties. In addition, an extended disturbance estimator is employed to estimate the external disturbance and thus eliminate its impact. The proposed controlling algorithm is deemed best able to address the external disturbance based on the nonlinear uncertainty compensation. With the input parameters and control commands, the ADRRAC strategy maintains servo system stability while approaching the controlling target. Following the algorithm description, a proof of the controlling stability of ADRRAC strategy is presented in detail as well. Experiments on a variety of tracking tasks are conducted on a prototype of an EMA to investigate the working performance of the proposed control strategy. The experimental outcomes are reported, which verify the effectiveness of the ADRRAC strategy, compared to widely applied control strategies. According to the data analysis results, our controller is capable of obtaining an even faster system response, a higher tracking accuracy and a more stable system state.

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“…The issues such as grid voltage unbalance, distortion, and instability appears in the system due to the interconnection of the PCU with the weak grid. The contaminated voltage affects the resonance and stability of the system [5][6][7][8]. Therefore, some course of action is needed to eradicate the aforementioned issue.…”

Section: Introductionmentioning

confidence: 99%

Trilateral control for LCL filter‐based system with single grid current sensor in weak grid

Kumari

Jain

2023

IET Energy Syst Integration

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A trilateral control for LCL filter‐based system is introduced by the authors with a single grid current sensor in weak grid conditions. The LCL filter increases the complexity when the uncertain nature of the grid comes into the picture. Moreover, the traditional three‐loop control technique requires three current sensors on the inverter side, three voltage sensors to sense voltage across the capacitor, and three current sensors on the grid side combined for sensing. A novel trilateral control technique utilising a single sensor is implemented to sense the grid current. This technique has reduced a considerable number of current sensors and voltage sensors. The α axis of grid current is proportional to sensed ‘a’ phase grid current. The β current in the utility grid is acquired by employing the controller reference quantities of the grid current. The computation of another variable, that is, the current in the inverter side inductor and the voltage across the capacitor, is executed by an estimation algorithm. The proposed technique provides the feature of reducing implementation financial value and weight that reduces the complexity and size of hardware. The synchronisation technique is executed by a modified dual second‐order generalised integrator digital phase‐locked loop for the grid‐connected converter. The implemented system offers the advantage of ease of implementation, good performance, and high stability. The validity of the proposed scheme in the implemented system is demonstrated by the simulated waveform obtained on the MATLAB/Simulink platform. Finally, the effectiveness of the proposed system is further justified by the experimental waveform procured from a prototype developed in the laboratory.

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Adaptive controller based on grid impedance estimation for stable operation of grid‐connected inverters under weak grid conditions

Cited by 10 publications

References 43 publications

Improved active power control of virtual synchronous generator for enhancing transient stability

Improved active power control of virtual synchronous generator for enhancing transient stability

Design and Analysis of an Active Disturbance Rejection Robust Adaptive Control System for Electromechanical Actuator

Trilateral control for LCL filter‐based system with single grid current sensor in weak grid

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