An Oscillatory Stability Criterion Based on the Unified &lt;inline-formula&gt;
                     &lt;tex-math notation="LaTeX"&gt;$dq$ &lt;/tex-math&gt;
                  &lt;/inline-formula&gt;-Frame Impedance Network Model for Power Systems With High-Penetration Renewables

Liu, Huan; Xie, Xiaorong; Liu, Wei

doi:10.1109/tpwrs.2018.2794067

Cited by 173 publications

(81 citation statements)

References 49 publications

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“…To achieve a desired performance, several DSCs have to be connected in cascaded. For instance, five DSCs with different value of n (n = 2, 4, 8,16,32) were arranged at the pre-filtering stage in [37]. The typical block diagram of the control strategy is shown in Figure 4.…”

Section: Modified Delay Signal Cancellation Operatormentioning

confidence: 99%

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A Modified DSC-Based Grid Synchronization Method for a High Renewable Penetrated Power System Under Distorted Voltage Conditions

Yang

et al. 2019

Energies

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With the increasing penetration of renewable energy, a weak grid with declining inertia and distorted voltage conditions becomes a significant problem for wind and solar energy integration. Grid frequency is prone to deviate from its nominal value. Grid voltages become more easily polluted by unbalanced and harmonic components. Grid synchronization technique, as a significant method used in wind and solar energy grid-connected converters, can easily become ineffective. As probably the most widespread grid synchronization technique, phase-locked loop (PLL) is required to detect the grid frequency and phase rapidly and precisely even under such undesired conditions. While the amount of filtering techniques can remove disturbances, they also deteriorate the dynamic performance of PLL, which may not meet the standard requirements of grid codes. The objective of this paper is to propose an effective PLL to tackle this challenge. The proposed PLL is based on quasi-type-1 PLL (QT1-PLL), which provides a good filtering capability by using a moving average filter (MAF). To accelerate the transient behavior when disturbance occurs, a modified delay signal cancellation (DSC) operator is proposed and incorporated into the filtering stage of QT1-PLL. By using modified DSCs and MAFs in a cascaded way, the settling time of the proposed method is reduced to around one cycle of grid fundamental frequency without degrading any disturbance rejection capability. To verify the performance, several test cases, which usually happen in high renewable penetrated power systems, are carried out to demonstrate the effectiveness of the proposed PLL. China [7,8], and caused many wind turbines to be tripped off. This highly impacted the operation of power distribution and renewable energy utilization. The grid frequency is prone to deviate from its nominal value since the inertia of the grid decreases. Grid voltages contain an amount of undesired components, such as fundamental frequency negative sequences (FFNSs) and harmonic components, which results in unbalanced and distorted grid conditions. It is an essential requirement for a renewable energy power converter to maintain stable operation with high performance under such conditions. To achieve this goal, a proper grid synchronization method is needed for all grid-connected applications. It is a big challenge for a grid synchronization method to extract grid frequency and phase information under such adverse conditions.

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Section: Modified Delay Signal Cancellation Operatormentioning

confidence: 99%

“…To verify the performance, several test cases, which usually happen in high renewable penetrated power systems, are carried out to demonstrate the effectiveness of the proposed PLL. China [7,8], and caused many wind turbines to be tripped off. This highly impacted the operation of power distribution and renewable energy utilization.…”

mentioning

confidence: 99%

A Modified DSC-Based Grid Synchronization Method for a High Renewable Penetrated Power System Under Distorted Voltage Conditions

Yang

et al. 2019

Energies

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“…The proposed method can be used for sub-mode analysis and oscillation suppression. H. Liu et al presented the concept of unified dq-frame impedance network model (INM), with which, different converters, as well as traditional generators/HVDCs, can be incorporated to form an integrated s-domain model of a practical system [28]. Then, a new criterion is then proposed to quantify the oscillatory stability by analyzing the frequency characteristics of the determinant of the matrix.…”

Section: G Power System Oscillation Analysismentioning

confidence: 99%

Guest Editorial for the Special Section on Enabling Very High Penetration Renewable Energy Integration Into Future Power Systems

Chen

Zhang

et al. 2018

IEEE Trans. Power Syst.

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“…There are two impedance-based analysis methods to analyze the interaction stability between inverters and weak grid [8][9][10][11]. On the one hand, References [8,9] proposed the sequence impedance model by the harmonic linearization modeling method, which is represented by a diagonal matrix, including the positive sequence and negative sequence components.…”

Section: Introductionmentioning

confidence: 99%

“…On the one hand, References [8,9] proposed the sequence impedance model by the harmonic linearization modeling method, which is represented by a diagonal matrix, including the positive sequence and negative sequence components. On the other hand, References [10,11] developed the dq impedance model by transforming three-phase variables into a rotating dq reference frame. The phase-locked loop (PLL) effect can be explained through linearizing the transitions between the system and the control dq frame.…”

Section: Introductionmentioning

confidence: 99%

Admittance Reshaping Control Methods to Mitigate the Interactions between Inverters and Grid

et al. 2019

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With the increasing impedance coupling between inverters and grid caused by the phase-locked loop (PLL), traditional three-phase inverters suffer from the harmonic distortion or instability problems under weak grid conditions. Therefore, the admittance reshaping control methods are proposed to mitigate the interactions between inverters and grid. Firstly, a dynamics model of traditional inverter output admittance including main circuit and PLL is developed in the direct-quadrature (dq) frame. And the qq channel impedance of the inverter presents as a negative incremental resistance with the PLL effect. Secondly, two admittance reshaping control methods are proposed to improve the system damping. The first reshaping technique uses the feedforward point of common coupling (PCC) voltage to modify the inverter output admittance. The second reshaping technique adopts the active damping controller to reconstruct the PLL equivalent admittance. The proposed control methods not only increase the system phase margin, but also ensure the system dynamic response speed. And the total harmonic distortion of steady-state grid-connected current is reduced to less than 2%. Furthermore, a specific design method of control parameters is depicted. Finally, experimental results are provided to prove the validity of the proposed control methods.

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An Oscillatory Stability Criterion Based on the Unified <inline-formula> <tex-math notation="LaTeX">$dq$ </tex-math> </inline-formula>-Frame Impedance Network Model for Power Systems With High-Penetration Renewables

Cited by 173 publications

References 49 publications

A Modified DSC-Based Grid Synchronization Method for a High Renewable Penetrated Power System Under Distorted Voltage Conditions

A Modified DSC-Based Grid Synchronization Method for a High Renewable Penetrated Power System Under Distorted Voltage Conditions

Guest Editorial for the Special Section on Enabling Very High Penetration Renewable Energy Integration Into Future Power Systems

Admittance Reshaping Control Methods to Mitigate the Interactions between Inverters and Grid

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