Identification of Grid Impedance for Purposes of Voltage Feedback Active Filtering

Tarkiainen, A.; Pollanen, R.; Niemelä, Markku; Pyrhönen, Juha

doi:10.1109/lpel.2004.828442

Cited by 37 publications

(26 citation statements)

References 4 publications

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“…Theoretical developments are given in [16], where its efficiency in fault detection and isolation of faulty sensor in electrical drives (FDI) was proven. Its principle consists on the calculation of the difference between two consecutive current measurements.…”

Section: Grid Impedance Variation Detectionmentioning

confidence: 99%

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A novel grid impedance estimation technique based on adaptive virtual resistance control loop applied to distributed generation inverters

Ghorbal

Slama‐Belkhodja

Guerrero

2013

2013 15th European Conference on Power Electronics and Applications (EPE)

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The penetration of the distributed power generation systems (DPGSs) based on renewable sources (PV, WT) is strongly dependent on the quality of the power injected to the utility grid. However, the grid impedance variation, mainly caused by grid faults somewhere in the electric network, can degrade the power quality and even damage some sensitive loads connected at the point of the common coupling (PCC). This paper presents detection-estimation method of the grid impedance variation. This estimation tehnique aims to improve the dynamic of the distributed generation (DG) interfacing inverter control and to take the decision of either keep the DG connected, or disconnect it from the utility grid. The proposed method is based on a fast and easy grid fault detection method. A virtual damping resistance is used to drive the system to the resonance in order to extract the grid impedance parameters, both resistive and inductive parts, using resonant filter frequency determination. Theoretical analysis and simulation results are presented to validate the proposed method.

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Section: Grid Impedance Variation Detectionmentioning

confidence: 99%

“…The threshold expression is given by (8) where more analytical development is performed in [15], [16]. The parameters used for the threshold expression are given in Table 1.…”

Section: Grid Impedance Variation Detectionmentioning

confidence: 99%

A novel grid impedance estimation technique based on adaptive virtual resistance control loop applied to distributed generation inverters

Ghorbal

Slama‐Belkhodja

Guerrero

2013

2013 15th European Conference on Power Electronics and Applications (EPE)

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“…In practice, the impedance information is of particular concern because it leads to interactions between the grid-connected power converters and the grid, which might cause the system resonance and instability (Sun, 2011). Aside from that, the impedance information is also essential for many other applications, such as power sources and conditioners design (Roberto, 2009), islanding detection (Ciobotaru et al, 2010), power flow control (Vasquez et al, 2009), passive filter design (Das, 2004), and active filter control (Tarkiainen et al, 2004).…”

Section: Introductionmentioning

confidence: 99%

New grid impedance estimation technique for grid-connected power converters

Guo

Sun

et al. 2014

J Engin Res

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Grid impedance estimation is crucial for operating and controlling of grid-connected converters, especially with the high penetration of renewable energy sources into microgrid and smart grid. One of the technical challenges is how to fast and accurately estimate the grid impedance, even under the distorted and unbalanced conditions. Many impedance estimation methods have been presented in the past decades. Most of them intentionally inject one or more disturbance signals, low frequency or high frequency, to excite the grid response. And then the grid impedance can be estimated by the voltage/current information of two steady-state operating points before and after the disturbance. However, these injected disturbances will deteriorate the power quality due to harmonics caused by the injected disturbances. In order to mitigate the problem, a new impedance estimation method is presented in this paper. Its basic idea lies in the inherent switching feature of the grid-connected power converter. The unique feature is that the proposed new grid impedance can be easily estimated, even under distorted and unbalanced grid voltage conditions with no need of the intentionally injected disturbance signals any more. First of all, the system equivalent impedance circuit is analyzed to clarify the proposed method, along with a theoretical comparison with the conventional one. Aside from that, an interesting estimation of voltage and current switching components are presented for determining the grid impedance with two well-defined equations. And then, the performance tests are carried out and the results verify the effectiveness of the proposed method. Finally, a typical application of the proposed method is presented and discussed.

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“…Some literatures have been researched the stability criterion related to the grid impedance [7]- [9], and many robust current controls against grid impedance also have been proposed under an uncertainty condition that the grid impedance could not be measured [10]- [12]. To overcome the uncertainty, some researches have proposed grid impedance prediction methods [13]- [ 14]. However, the theoretical analysis and negative impact of the low order harmonics caused by the grid impedance have been reported rarely, and the compensating method to attenuate the impact of grid impedance not proposed yet.…”

Section: Introductionmentioning

confidence: 99%

An active feedforward compensation for a current harmonics reduction in three-phase grid-connected inverters

Park

Choi

Kim

2013

IECON 2013 - 39th Annual Conference of the IEEE Industrial Electronics Society

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The paper discusses the influence of a grid impedance, especially for a leakage inductance of a grid side transformer. The grid impedance does not usually take into account during the design stage of the current controller. As a result, low order harmonics in the grid current are distorted. In this paper, the active feed-forward compensation method is proposed for the purpose of attenuating the current distortion.The proposed method can be applied to L filter as well as LCL filter. The effectiveness of the method is verified through various simulations and experiments based on a 1.5kW voltage source inverter prototype.

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Identification of Grid Impedance for Purposes of Voltage Feedback Active Filtering

Cited by 37 publications

References 4 publications

A novel grid impedance estimation technique based on adaptive virtual resistance control loop applied to distributed generation inverters

A novel grid impedance estimation technique based on adaptive virtual resistance control loop applied to distributed generation inverters

New grid impedance estimation technique for grid-connected power converters

An active feedforward compensation for a current harmonics reduction in three-phase grid-connected inverters

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