Optimal Tuning of the Current Loop for Dual-Loop Controlled Grid-Forming Converters Based on Active Damping Optimization

Zhao, Zhihong; Han, Zhen; Liu, Xunduan; Yao, Jia; Ji, Baojian; Wang, Shuzheng; Zhao, Jianfeng

doi:10.1109/access.2021.3061098

Cited by 10 publications

(5 citation statements)

References 41 publications

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“…The effect of the resonant term could be disregarded for frequencies that are not near the fundamental frequency [20]. Therefore, the loop gain could be simplified by just considering the proportional term as (6), for analyzing the system stability in the range of medium and high frequencies.…”

Section: System Description and Stability Analysismentioning

confidence: 99%

“…s ω that comes from the delay in (6). In other words, the introduced negative phase of the delay helps the single-loop GFIs to work stably when f r > f s /3.…”

Section: System Description and Stability Analysismentioning

confidence: 99%

“…The authors are with the AAU Energy, Aalborg University, Aalborg, Denmark (e-mail: alak@energy.aau.dk; juq@energy.aau.dk; joz@energy.aau.dk). parameters, as well as the delay that comes from the pulsewidth modulation and sampling [6].…”

Section: Introductionmentioning

confidence: 99%

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Passivity-Based Control of Single-Loop Grid-Forming Inverters

Akhavan

Vásquez

Guerrero

2023

IEEE J. Emerg. Sel. Top. Ind. Electron.

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This paper addresses the passivity-based control of grid-forming inverters with an emphasis focused on the singleloop control system. It is elaborated that the closed-loop control system could be stabilized even without damping the resonance of the LC filter, and just by introducing the negative phase to the system. This negative phase is introduced using an all-pass filter that is adopted in series with the voltage regulator, and therefore, the system structure keeps its simplicity. It is also revealed that, unlike the traditional single-loop control system in which the stability region is higher than one-third of the sampling frequency, the proposed method is able to widen the stability region to frequencies lower than one-sixth of the sampling frequency. Then, the output impedance of the inverter is modified using the feedback of the output current to have a passive behavior up to the Nyquist frequency, which assures the stability of the system in different grid impedances and load conditions. The controller design procedure is elaborated in each part to provide the passivity of the system. The proposed control system is examined by experimental tests in grid-tied and off-grid modes to validate the theoretical concepts. 1

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Section: System Description and Stability Analysismentioning

confidence: 99%

“…s ω that comes from the delay in (6). In other words, the introduced negative phase of the delay helps the single-loop GFIs to work stably when f r > f s /3.…”

Section: System Description and Stability Analysismentioning

confidence: 99%

See 1 more Smart Citation

Passivity-Based Control of Single-Loop Grid-Forming Inverters

Akhavan

Vásquez

Guerrero

2023

IEEE J. Emerg. Sel. Top. Ind. Electron.

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“…In addition, many different current control loop solutions have been developed, most of which are based on symmetrical component extraction [11], [16], discussing tuning of parameters [17], as well as dynamic and tracking performance to directly control the injected current [18]. Furthermore, active and reactive power production and utilisation have been extensively analysed in recent years.…”

Section: B Control Structuresmentioning

confidence: 99%

Integrated Framework for Development, Emulation, and Testing of High-Level Converter Control Functions for Distributed Generation Sources

et al. 2021

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“…The VSC generally adopts voltage and current dual-loop Proportional Integral (PI) control, which can theoretically achieve a zero steady-state error tracking effect [14]. However, the PI control is sensitive to the uncertainty of the system parameters and external disturbances, and its tuning process is tedious [15], which will affect the stability of the DC bus voltage. To effectively regulate the DC bus voltage, the current inner loop robust control in dualloop control has been studied in many kinds of literature.…”

Section: Introductionmentioning

confidence: 99%

Coordinated Voltage-Power Control for DC Distribution Networks Based on an Uncertainty and Disturbance Estimator

Tan

Kong

et al. 2023

Electronics

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DC distribution networks are low-inertia systems with a range of uncertainties and disturbances. The traditional droop control widely used in DC distribution networks has a contradiction between the accurate power sharing of power units and voltage deviation due to the presence of line impedance. To overcome this contradiction and enhance the immunity and tracking performance of voltage-source converter (VSC) current inner loop PI control, this paper proposes a coordinated voltage-power control strategy based on an uncertainty and disturbance estimator (UDE) for DC distribution networks. Firstly, the improved droop control strategy based on the UDE is proposed, which not only avoids the influence of line impedance on the load current sharing, but also achieves voltage stabilization at the set value. Secondly, an improved VSC current inner loop controller based on the UDE is designed to improve the VSC’s tracking performance for the droop output reference value. The UDE control theory is applied to estimate and compensate for the uncertainties and disturbances of the VSC current inner loop control, in order to improve the tracking and immunity of the VSC current inner loop and enhance the DC voltage robustness. Finally, a three-terminal DC distribution network is taken as an example to verify the effectiveness of the proposed strategy.

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Optimal Tuning of the Current Loop for Dual-Loop Controlled Grid-Forming Converters Based on Active Damping Optimization

Cited by 10 publications

References 41 publications

Passivity-Based Control of Single-Loop Grid-Forming Inverters

Passivity-Based Control of Single-Loop Grid-Forming Inverters

Integrated Framework for Development, Emulation, and Testing of High-Level Converter Control Functions for Distributed Generation Sources

Coordinated Voltage-Power Control for DC Distribution Networks Based on an Uncertainty and Disturbance Estimator

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