Virtual impedance current limiting for inverters in microgrids with synchronous generators

Paquette, Andrew D.; Divan, Deepak

doi:10.1109/ecce.2013.6646818

Cited by 88 publications

(164 citation statements)

References 21 publications

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“…From (22), when K e (E * − V C ) − n(P − P set ) is zero, the angular velocity becomes zero and the controller states can converge to the desired equilibrium point defined by the P ∼ V droop control. Considering a similar analysis for the controller dynamics (14)- (15), then E q and E qq are proven to remain on a similar ellipse…”

Section: B Proposed Nonlinear Controller (Outer Loop)mentioning

confidence: 89%

“…The P ∼ V and Q ∼ −ω droop expressions are adopted in this paper due to the introduction of the virtual resistance r v in the output via the proposed control design [24]. The initial conditions of the controller states E d , E dq , E q , and E qq are selected as 0, 1, 0, and 1, respectively, and the nonlinear dynamics (12)- (15) have been proposed in a way to guarantee the boundedness of the controller states E d and E q in the range E d , E q ∈ [−E max , E max ] as explained below. For the controller dynamics (12) and (13), one can consider a Lyapunov function candidate as…”

Section: B Proposed Nonlinear Controller (Outer Loop)mentioning

confidence: 99%

“…In grid-connected applications, in order to improve the system stability and also protect the inverter and the filter against high currents, a current-limiting property should be additionally guaranteed. For this purpose, additional saturation blocks or limiters are often used in combination with the droop controller [13], [14], and [15]. However, these techniques can lead to instability due to integrator windup.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Three-Phase Grid-Connected Inverters Equipped with Nonlinear Current- Limiting Control

Dedeoglu

Konstantopoulos

2018

2018 UKACC 12th International Conference on Control (CONTROL)

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Voltage source inverters are essential devices to integrate renewable energy sources to the main grid and control the injection of real and reactive power. Due to their inherent nonlinear dynamics, the stability and particularly the current limitation of power controlled inverters represent challenging tasks under grid variations or unrealistic power demands. In this paper, using the synchronously rotating dq transformation, a nonlinear current limiting controller is proposed for threephase inverters connected to the grid through an LCL filter. The proposed controller introduces a cascaded control structure with inner current and voltage control loops and an outer power controller that includes a droop function to support the grid and rigorously guarantee a limit for the grid currents. Using nonlinear closed-loop system analysis and based on input-to-state stability theory, the limits for the d-and q-axis grid currents are proven independently from each other without adding any saturation units into the system that can lead to instability. Extensive simulation results of the proposed nonlinear currentlimiting controller are provided to demonstrate its effectiveness and current-limiting property.

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Section: B Proposed Nonlinear Controller (Outer Loop)mentioning

confidence: 89%

Section: B Proposed Nonlinear Controller (Outer Loop)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Three-Phase Grid-Connected Inverters Equipped with Nonlinear Current- Limiting Control

Dedeoglu

Konstantopoulos

2018

2018 UKACC 12th International Conference on Control (CONTROL)

View full text Add to dashboard Cite

show abstract

“…In [140], a comparative study of PV systems shows that distributed PV generators have more advantages in terms of stability than solar farms. In a study of the transient stability of DG units, it is observed that the stability is greatly affected by a current limiter used to protect these units against damage [141].…”

Section: Challenges Of Microgridsmentioning

confidence: 99%

Evolution of Microgrids with Converter-Interfaced Generations: Challenges and Opportunities

Hossain¹,

Pota²,

Hossain³

et al. 2018

Preprint

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Although microgrids facilitate the increased penetration of distributed generations (DGs) and improve the security of power supplies, they have some issues that need to be better understood and addressed before realising the full potential of microgrids. This paper presents a comprehensive list of challenges and opportunities supported by a literature review on the evolution of converter-based microgrids. The discussion in this paper presented with a view to establishing microgrids as distinct from the existing distribution systems. This is accomplished by, firstly, describing the challenges and benefits of using DG units in a distribution network and then those of microgrid ones. Also, the definitions, classifications and characteristics of microgrids are revised according to their specific roles to provide a sound basis for novice researchers to undertake ongoing research on microgrids.

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“…In [142], a comparative study of PV systems shows that distributed PV generators have more advantages in terms of stability than solar farms. In a study of the transient stability of DG units, it is observed that the stability is greatly affected by a current limiter used to protect these units against damage [143]. In [144], a virtual power-angle instability considering an active power disturbance is analysed using the virtual 505 power-angle curves of a converter connected to an infinity bus.…”

mentioning

confidence: 99%

Evolution of Microgrids with Converter-Interfaced Generations: Challenges and Opportunities

Hossain¹,

Pota²,

Hossain³

et al. 2019

Preprint

View full text Add to dashboard Cite

Although microgrids facilitate the increased penetration of distributed generations (DGs) and improve the security of power supplies, they have some issues that need to be better understood and addressed before realising the full potential of microgrids. This paper presents a comprehensive list of challenges and opportunities supported by a literature review on the evolution of converter-based microgrids. The discussion in this paper presented with a view to establishing microgrids as distinct from the existing distribution systems. This is accomplished by, firstly, describing the challenges and benefits of using DG units in a distribution network and then those of microgrid ones. Also, the definitions, classifications and characteristics of microgrids are summarised to provide a sound basis for novice researchers to undertake ongoing research on microgrids.

show abstract

Virtual impedance current limiting for inverters in microgrids with synchronous generators

Cited by 88 publications

References 21 publications

Three-Phase Grid-Connected Inverters Equipped with Nonlinear Current- Limiting Control

Three-Phase Grid-Connected Inverters Equipped with Nonlinear Current- Limiting Control

Evolution of Microgrids with Converter-Interfaced Generations: Challenges and Opportunities

Evolution of Microgrids with Converter-Interfaced Generations: Challenges and Opportunities

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