An Adaptive Digital Control Technique for Improved Performance of Grid Connected Inverters

González-Espín, Fran; Patrao, Iván; Figueres, E.; Garcerá, G.

doi:10.1109/tii.2012.2225437

Cited by 31 publications

(15 citation statements)

References 26 publications

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“… The MG is operated at minimum SCR and X/R. 4. The hard limits are not applied in the Inverter-based DGs for the inductive mode of operation to allow maximizing the fast dynamic reactive power reserve to react during system disturbances.…”

Section: Droop-based Voltage and Frequency Controllersmentioning

confidence: 99%

“…Primary control is mainly devoted to maintain the local variables on site such as voltage and frequency within the standard limits involving control loops for current injections and droop control [1,[4][5][6]. As for the secondary control level, it is dedicated for controlling the system voltage profile and frequency to maintain the MG parameters within the permissible operational limits.…”

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confidence: 99%

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Adaptive Roles of Islanded Microgrid Components for Voltage and Frequency Transient Responses Enhancement

Ibrahim¹,

Moursi

Huang

2015

IEEE Trans. Ind. Inf.

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This paper introduces a novel framework of coordinated voltage and frequency control strategy for islanded Microgrid (MG) operation. The proposed control schemes rely on local measurements as communication-free control approach. Therefore, the distributed controllers of the MG components have been deployed based on their slow, medium and fast dynamic responses to maintain the voltage and frequency in adherence to IEEE Standards 1547 and 929. The various voltage and frequency control responses associated with reactive power management scheme are efficiently utilized based on well-defined states of operation and transient management scheme. In each state, the roles of each device for voltage and frequency regulations are defined with its regulation capability and response time based on its local measurements. Consequently, the fast reactive power compensation and rapid frequency regulation are ensured based on the inverter based devices at challenging operating conditions. As a result, the proposed control strategy improves the voltage and frequency regulation, transient response and MG stability. A comprehensive simulation study has verified the superior performance of the communication-free approach during steady state and in response to severe disturbances. Index Terms-Islanded Microgrid, Communication-Free Coordinated Voltage and Frequency Control, Dynamic ReactivePower Reserve, Transient Response and Microgrid Stability. , IEEE Transactions on Industrial Informatics operating criteria. Therefore, the coordination between the DGs and OLTC is proposed with managing the active and reactive power generation from DGs to achieve an effective voltage regulation. This coordinated voltage control has inquired high band width communication infrastructure resulted in increasing the system complexity [25][26][27].In [28], a new method was proposed to minimize the requirement of communication infrastructure by employing the state estimator. The coordinated voltage control based on Multi-Agent System has been deployed among the OLTC, capacitor banks and DGs. The OLTC was controlled based on a line drop compensation scheme so that few RTUs were installed at selected buses, mainly for the DGs and capacitor banks; also, the voltage profile along the feeder was estimated. The measured and estimated voltages at all buses have been processed to identify the pilot bus to control the OLTC. Consequently, the generation status of the DGs has been accounted in controlling the OLTC to avoid the violation of operating voltage criteria along the feeder. Also, the coordinated voltage controller in the distribution network with the penetration of DGs and MG was considered as an important optimization problem formulation. In this context, several optimization techniques with different objective functions such as minimizing the voltage deviation, system losses and reducing the tap movements and switching capacitor banks have been deployed [29][30][31][32][33][34][35][36][37][38][39][40][41]. The voltage control for the islanded MG becomes a ...

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Section: Droop-based Voltage and Frequency Controllersmentioning

confidence: 99%

mentioning

confidence: 99%

Adaptive Roles of Islanded Microgrid Components for Voltage and Frequency Transient Responses Enhancement

Ibrahim¹,

Moursi

Huang

2015

IEEE Trans. Ind. Inf.

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“…The proposed algorithm uses a space vector modulation (SVM), in order to obtain low switching ripple in the output currents, at a fixed switching frequency. The harmonic current from the filter is tracked and transformed to dq controller to reduce current disturbances [13]. This control scheme helps to improve the stability margins of previous approaches and reduce the harmonic currents [14] - [16].…”

Section: Introductionmentioning

confidence: 99%

Modeling and control strategy of three phase neutral point clamped multilevel PV inverter connected to the grid

Arulkumar

Vijayakumar

Palanisamy

2015

Journal of Building Engineering

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“…Some controls may use a fixed estimate of the grid frequency, resulting in simplified design but susceptible to a large drop in controller gain at the resonant frequencies if the fundamental frequency of the grid changes even slightly [9]. Alternatively, a real-time estimate of the grid frequency from the SRF-PLL can be used to allow for the resonant-control gains to remain at the desired values regardless of changes in the grid frequency [10].…”

Section: Introductionmentioning

confidence: 99%

Adaptive resonant current-control for active power filtering within a microgrid

Hogan

González-Espín

Hayes

et al. 2014

2014 IEEE Energy Conversion Congress and Exposition (ECCE)

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This paper presents an adaptive current-control scheme for a three-phase active-power filter (APF) for use within a microgrid. A vector-proportional-integral (VPI) controller with grid frequency tracking capabilities is used to compensate up to the 18 th harmonic in the synchronous-reference-frame. This control scheme utilizes an advanced synchronous-referenceframe phase-locked loop (SRF-PLL) to update the resonant frequency values of the current controllers to ensure the resonant frequency of the VPI remain at the optimum point regardless of changes in the grid frequency. The advanced SRF-PLL uses adaptive digital notch filters based on the adaptive lattice structure to implement an adaptive lattice SRF-PLL (ALSRF-PLL). The ALSRF-PLL is able to reject the grid voltage harmonics thus preventing the estimation of the grid frequency to be polluted, which is essential for the correct behavior of the adaptive VPI controllers. In order to validate the adaptive control structure applied to APF, experimental testing has been carried out in a 70 kVA laboratory microgrid, where a 15 kVA three phase inverter is used as the APF.

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An Adaptive Digital Control Technique for Improved Performance of Grid Connected Inverters

Cited by 31 publications

References 26 publications

Adaptive Roles of Islanded Microgrid Components for Voltage and Frequency Transient Responses Enhancement

Adaptive Roles of Islanded Microgrid Components for Voltage and Frequency Transient Responses Enhancement

Modeling and control strategy of three phase neutral point clamped multilevel PV inverter connected to the grid

Adaptive resonant current-control for active power filtering within a microgrid

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