Design of a novel robust current controller for grid-connected inverter against grid impedance variations

Wang, Jing; Tyuryukanov, Ilya; Monti, Antonello

doi:10.1016/j.ijepes.2019.03.006

Cited by 24 publications

(15 citation statements)

References 24 publications

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“…In the grid-tied and islanded mode, apart from the synchronization method, the same procedure is applied in many papers using traditional dual loop PID+R controllers. A reference current or voltage value is tracked by an outer voltage loop and inner current loop in abc (natural frame), dq (synchronous reference frame), or αβ (stationary reference frame) frame in the single or three-phase and the s or z domain [9], [148], [149], [158]- [161], [150]- [157].…”

Section: Pid+r Technique (Dual Loop)mentioning

confidence: 99%

“…The results show that the H∞ controller is more robust than MPC. Another study of control parameter roles in the stability of the current-controlled grid-tied inverter in the grid impedance variation condition was conducted in [161]. The decomposition method clarifies the stable region in the z domain in the grid impedance uncertainty.…”

Section: E Robustness Analysismentioning

confidence: 99%

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Recent Contributions, Future Prospects and Limitations of Interlinking Converter Control in Hybrid AC/DC Microgrids

et al. 2021

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This work analyzes interlinking converter control in hybrid AC/DC microgrids. The paper addresses the state-of-the-art general hybrid microgrid structure. The key power electronics topologies are used as bidirectional interface converters in the AC and DC parts. Different control structures of hybrid microgrids are categorized, followed by the classification of the main control functions, their control strategies, and the control techniques and a summary of their positive and negative aspects and applications. Control functions, their strategies and techniques are classified in the interlinking-converter based. Finally, overall control objectives, time-scaled control structures, and their strategies are outlined. The prospects, main challenges, research gaps, and the trend of the hybrid microgrid structure and control are reviewed and summarized in the conclusions.

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Section: Pid+r Technique (Dual Loop)mentioning

confidence: 99%

Section: E Robustness Analysismentioning

confidence: 99%

Recent Contributions, Future Prospects and Limitations of Interlinking Converter Control in Hybrid AC/DC Microgrids

et al. 2021

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“…Entretanto tal filtro apresenta uma ressonância inerente, devido aos três elementos passivos em sua estrutura, o que causa problemas de instabilidade e oscilações nas correntes injetadas na rede. Ainda, tal problema é acentuado pela característica variante no tempo da rede elétrica, o que afeta a ressonância do filtro [3].…”

Section: Introductionunclassified

Análise dos Impactos do Atraso de Implementação em Controladores de Corrente com Amortecimento Ativo para Conversores Conectados à Rede

Araujo¹,

Vieira²

2021

Proceedings of the 13th Seminar on Power Electronics and Control (SEPOC 2021)

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Esse trabalho apresenta análises sobre o efeito causado pelo atraso de implementação no amortecimento ativo de inversores conectados à rede com filtro LCL. Através do desenvolvimento matemático, é constatado que a realimentação da corrente do capacitor do filtro apresenta menor amortecimento quando há atraso de implementação no sistema, com isso, um elevado ganho do amortecimento ativo pode levar o sistema à instabilidade. Com intuito de validar a teoria desenvolvida, múltiplos compensadores ressonantes são utilizados para controlar o sistema e resultados de simulações são demonstrados.

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“…It was shown that once a set of smooth current references were provided to the controller, the inverter maintained nominal performance during a sudden increase of the grid impedance. Similarly, other types of controllers implemented in the αβ-frame including a robustly tuned Proportional Resonant (PR) controller, and a combination of PR and a lead compensator are proposed in [16,17]. While these solutions in the αβ-frame may be promising, VIR implementation requires determination of the grid voltage angle, and the synchronous reference frame PLL (SRF-PLL) is widely adopted in three phase inverters for this purpose [18].…”

Section: Introductionmentioning

confidence: 99%

Obtaining Robust Performance of a Current fed Voltage Source Inverter for Virtual Inertia Response in a Low Short Circuit Ratio Condition

Ally

Jong

2021

Energies

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Low inertia levels are typical in island power systems due to the relatively small rotational generation. Displacing rotational generation units with static inertia-less PV power results in a significant increase in the frequency volatility. Virtual inertia provided by inverter-storage systems can resolve this issue. However, a low short circuit ratio (SCR) at the point of common coupling together with a fast phase locked loop (PLL) will compromise the response performance of the system. To address this issue, a robust PI controller (RPI) for the inner current-loop of a current fed grid-connected inverter is proposed. The PLL disturbance and grid impedance are incorporated into a single model and recast to a generalized representation of the system, thereby allowing easy tuning of the RPI by the mixed sensitivity H∞ method. The performance of the RPI is compared with that of a PI controller (PI) tuned by the regular loop-shaping method. The results show that when the SCR is above 10, the performance of both controllers is equivalent. However, lowering of the SCR compromises the performance of the system with PI and it becomes underdamped at SCR < 2. On the contrary, the system with the RPI is capable of maintaining the nominal performance throughout the same SCR decrease.

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Design of a novel robust current controller for grid-connected inverter against grid impedance variations

Cited by 24 publications

References 24 publications

Recent Contributions, Future Prospects and Limitations of Interlinking Converter Control in Hybrid AC/DC Microgrids

Recent Contributions, Future Prospects and Limitations of Interlinking Converter Control in Hybrid AC/DC Microgrids

Análise dos Impactos do Atraso de Implementação em Controladores de Corrente com Amortecimento Ativo para Conversores Conectados à Rede

Obtaining Robust Performance of a Current fed Voltage Source Inverter for Virtual Inertia Response in a Low Short Circuit Ratio Condition

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