Impedance Shaping of the Grid-Connected Inverter with LCL Filter to Improve Its Adaptability to the Weak Grid Condition

Yang, Dongsheng; Ruan, Xinbo; Wu, Heng

doi:10.1109/tpel.2014.2300235

Cited by 419 publications

(245 citation statements)

References 32 publications

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“…This is required for an accurate estimate of the error, due to the coupling between source and load impedance given by (16). Relating the above three methods to the modified sequence domain yields:…”

Section: Methods To Evaluate Accuracy Of Siso Impedance Modelsmentioning

confidence: 99%

“…The impedance Z p is obtained by assuming positive sequence shunt current injection I inj,p in the interface point (14) needed to obtain the model reduction from modified to original sequence domain (16) between source and load subsystem [21]. This gives the following set of equations:…”

Section: Relation Between Impedance Models In Original and Modifimentioning

confidence: 99%

“…It is proven in appendix D that this model has the same marginal stability condition as the dq and modified sequence domain models. An important and undesirable property in (16) is that parts of the source (grid) subsystem impedance appears in the expression for the load (converter) subsystem impedance. This appears counter-intuitive as one would expect the converter impedance model to only depend on the converter parameters and the system operation point.…”

Section: Relation Between Impedance Models In Original and Modifimentioning

confidence: 99%

“…three-phase Voltage Source Converters (VSC) [1]- [4], Modular Multilevel Converters [5] [6] and single-phase VSCs [7]- [9]. Some examples of applications of impedancebased models for small signal stability analysis can be found in [10]- [16].…”

mentioning

confidence: 99%

“…A frequency shift is also required in this step. This is achieved by the relations (16) or (18) derived in section IV. Note that this procedure is not reversible, i.e.…”

mentioning

confidence: 99%

See 4 more Smart Citations

On the Equivalence and Impact on Stability of Impedance Modeling of Power Electronic Converters in Different Domains

Rygg

Molinas

Zhang

et al. 2017

IEEE J. Emerg. Sel. Topics Power Electron.

108

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Abstract-Small-signal analysis of power electronic converters and systems is often carried out by impedance-based methods. At the core of these methods lies the impedance modelling, which can either be obtained through analytical calculations, simulations or measurements. The impedance models can be obtained into two main domains -the dq-domain and the sequence domain. In the dq-domain the impedance model is a 2x2 matrix, while in the sequence domain it is composed by the positive and negative sequence impedance. Recently, a third domain called the modified sequence domain was defined as an extension to the sequence domain, but also with clear similarities to the dq-domain. The objective of this paper is to unambiguously relate to each other the impedances in these three domains, and to show how this equivalence translates into their respective stability assessments. It is also proven that the sequence domain impedance has the same marginal stability condition as the dq-domain impedance matrix.The three-phase Voltage Source Converter is used as an example converter in this paper, as its impedance model in all three domains is well established and reported by previous research. The results in this paper shows that the modified sequence domain model can be derived from the dq-domain model (and vice versa), and that the stability analysis will be identical in these two domains. It is also shown how the original sequence domain model can be derived from the two other models through a model reduction. However, a small discrepancy between the two Nyquist plots is observed in the presence of components such as phase lock loop or DC-link control.

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Section: Methods To Evaluate Accuracy Of Siso Impedance Modelsmentioning

confidence: 99%

Section: Relation Between Impedance Models In Original and Modifimentioning

confidence: 99%

Section: Relation Between Impedance Models In Original and Modifimentioning

confidence: 99%

mentioning

confidence: 99%

“…A frequency shift is also required in this step. This is achieved by the relations (16) or (18) derived in section IV. Note that this procedure is not reversible, i.e.…”

mentioning

confidence: 99%

See 3 more Smart Citations

On the Equivalence and Impact on Stability of Impedance Modeling of Power Electronic Converters in Different Domains

Rygg

Molinas

Zhang

et al. 2017

IEEE J. Emerg. Sel. Topics Power Electron.

108

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Enhanced performance of PMSG wind turbines during grid disturbance at different network strengths considering fault current limiter

Okedu

Muyeen

2021

Int Trans Electr Energ Syst

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Summary With the recent proliferation and penetration of wind farms into existing power grids, it is paramount to conduct numerous studies to counter grid disturbances based on operational grid codes. One of the ways of generating electric power from wind energy is by employing the promising technology of the permanent magnet synchronous generator (PMSG) wind turbine. In order to solve the transient stability intricacies posed by the stochastic nature of wind energy during grid faults, this paper proposes a fault current limiter for a PMSG‐based wind turbine control. The fault current limiter used in this study is a series dynamic braking resistor (SDBR). The best location to place the SDBR on the machine‐side and grid‐side converters (GSCs) of the wind generator was investigated, considering the grid voltage as its switching signal during transient state. Efforts have been given to find a suitable sizing of the SDBR. The performance of the SDBR has been investigated at various network strengths in weak and strong grids. A severe three‐line‐to‐ground fault and asymmetrical faults were used to test the robustness and rigidity of the controllers of the wind generator. The system performance was evaluated using power system computer aided design and electromagnetic transient including DC (PSCAD/EMTDC) platform. The same conditions of operation were used in investigating the various scenarios considered in this study, for effective comparison.

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Novel time‐domain average model for harmonic current prediction in photovoltaic and wind power units

Moraes

Reis

Filho

2021

Int Trans Electr Energ Syst

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Computer models designed to assess harmonic levels created by renewable energy sources (RESs) need to reproduce the converter operation effect. However, only a few simplified time‐domain models have been developed to predict harmonics while reducing simulation time, which is one of the main limitations of detailed models. This paper presents a novel time‐domain model, called the harmonic average model (HM), to estimate harmonic currents generated by inverters. The superposition principle is applied to include dead time and switching effects in the average model. In addition, the snubber effect is considered by introducing snubber circuits in the HM. Time‐domain simulations of a type‐IV wind turbine are executed with existing models and then with the HM to evaluate the proposed model. Field measurements in a wind power plant and in a photovoltaic plant are used to validate the HM under different power injection scenarios. The results indicate that the HM follows reference currents while accurately estimating the harmonic spectra. Further, the HM is relatively simple to deploy and reduces computation time. A comparison between the HM results and field measurements suggests that the simulated spectra are an adequate approximation of the measured spectra. These results confirm that the HM can be used by transmission system operators to support the prediction of harmonic currents generated by inverters and to estimate the impact of RESs on voltage quality.

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Impedance Shaping of the Grid-Connected Inverter with LCL Filter to Improve Its Adaptability to the Weak Grid Condition

Cited by 419 publications

References 32 publications

On the Equivalence and Impact on Stability of Impedance Modeling of Power Electronic Converters in Different Domains

On the Equivalence and Impact on Stability of Impedance Modeling of Power Electronic Converters in Different Domains

Enhanced performance of PMSG wind turbines during grid disturbance at different network strengths considering fault current limiter

Novel time‐domain average model for harmonic current prediction in photovoltaic and wind power units

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