Adaptive Estimation of Three-Phase Grid Voltage Parameters Under Unbalanced Faults and Harmonic Disturbances

Dai, Zhiyong; Lin, Wei

doi:10.1109/tpel.2016.2605131

Cited by 32 publications

(8 citation statements)

References 31 publications

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“…Moreover, the boundedness and exponential decay of the signal estimation error can be established using Theorem A.3 given in [38]. It is to be noted here that this result is mathematically weaker than the global exponential stability results presented in [21], [22]. Using the estimatedμ, the frequency and the phase of the fundamental components can be calculated by:…”

Section: Multiple Adaptive Observermentioning

confidence: 99%

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Coordinate Transformation-Free Observer-Based Adaptive Estimation of Distorted Single-Phase Grid Voltage Signal

et al. 2020

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This paper studies the phase and frequency estimation problem of single-phase grid voltage signal in the presence of DC offset and harmonics. For this purpose, a novel parameterized linear model of the grid voltage signal is considered where the unknown frequency of the grid is considered as the parameter. Based on the developed model, a linear observer (Luenberger type) is proposed. Then using Lyapunov stability theory, an estimator of the unknown grid frequency is developed. In order to deal with the grid harmonics, multiple parallel observers are then proposed. The proposed technique is inspired by other Luenberger observers already proposed in the literature. Those techniques use coordinate transformation that requires real-time matrix inverse calculation. The proposed technique avoids real-time matrix inversion by using a novel state-space model of the grid voltage signal. In comparison to similar other techniques available in the literature, no coordinate transformation is required. This significantly reduces the computational complexity w.r.t. similar other techniques. Comparative experimental results are provided with respect to two other recently proposed nonlinear techniques to show the dynamic performance improvement. Experimental results demonstrate the suitability of the proposed technique.

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Section: Multiple Adaptive Observermentioning

confidence: 99%

“…non-smooth jump of phase, frequency, DC offset and amplitude. In the traditional state space observer design [20]- [22], by considering y = x 1 , andẏ = x 2 , the dynamics of the grid voltage signal in the state-space form is given by:…”

Section: Estimation Of Phase and Frequencymentioning

confidence: 99%

Coordinate Transformation-Free Observer-Based Adaptive Estimation of Distorted Single-Phase Grid Voltage Signal

et al. 2020

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“…As these disturbance observers are usually implemented in the synchronous reference frame, they can not be simply integrated into control schemes implemented in stationary reference frame. There are some observers designed for unbalanced network, such as those presented in [27]- [29]. However, they are usually used for estimating or predicting fundamental and harmonic components of grid voltages.…”

Section: Introductionmentioning

confidence: 99%

Robust Deadbeat Predictive Power Control With a Discrete-Time Disturbance Observer for PWM Rectifiers Under Unbalanced Grid Conditions

Yang

Zhang

Liang

et al. 2019

IEEE Trans. Power Electron.

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This paper presents a robust deadbeat predictive power control (DPPC) for PWM rectifiers with consideration of parameter mismatches under unbalanced grid conditions. Firstly, conventional DPPC is modified to extend its application to both ideal and unbalanced grid conditions. Secondly, tracking error of the modified DPPC with inaccurate grid-side impedance is analyzed. Thirdly, a discrete-time power disturbance observer (DPDO) is designed to achieve accurate power control with mismatched parameters. The designed DPDO can predict complex power at the next sampling instant and estimate system disturbance simultaneously. Therefore, the DPDO can contribute to eliminate steady-state tracking error resulting from disturbances caused by inaccurate parameters and compensate onestep delay in digital implementation. Although satisfactory steady-state performance can be obtained with modified DPPC and DPDO, transient performance still deteriorates significantly with inaccurate value of grid-side inductance. Thus, an online adaptive method to estimate mismatched inductance is finally developed based on the proposed DPDO. Both DPPC and DPDO are implemented in the stationary reference frame without coordinate transformation. Theoretical analysis confirms that the proposed DPDO can track disturbance without phase lag or magnitude error. Experimental tests and comparative studies with a prior DPPC on a two-level PWM rectifier validate the effectiveness of the proposed scheme.

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“…In the past decade, a large number of effective estimation methods for grid voltage parameters [3–23] including positive‐ and negative‐sequence voltage components and their frequency, amplitudes and phase angles have been proposed such as Kalman filtering [3, 4], discrete Fourier transform [5, 6], zero‐crossing detection [7], adaptive notch filter [8–11], least‐squares estimation [14] and phase‐locked loop (PLL) [15–23].…”

Section: Introductionmentioning

confidence: 99%

Global accurate estimation of positive‐ and negative‐sequence voltage components for variable frequency AC systems

Dai

Mwaniki

et al. 2018

IET Power Electronics

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In this study, a global observer-based method is proposed for variable frequency AC systems of more electric aircraft (MEA) to estimate positive-and negative-sequence components and their parameters. Looking at the measurable grid voltage as a parameterised system containing the unknown coefficient-voltage frequency, a mathematical model based on threephase grid voltage is established. According to the obtained dynamic model, a global observer is developed to achieve the estimation of positive-and negative-sequence voltage components and their frequency, amplitudes and phase angles with zero steady-state error. Different from most existing methods which are developed for constant frequency AC grids and only have local convergence, a Lyapunov-based argument proof provided in this study shows that the proposed observer is able to achieve global asymptotic convergence in theoretical sound. Also, it ensures that the addressed global observer method has a better stability and faster dynamic performance for variable frequency AC grids of MEA. Both simulations and experimental results are provided to validate the proposed global observer scheme.

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Adaptive Estimation of Three-Phase Grid Voltage Parameters Under Unbalanced Faults and Harmonic Disturbances

Cited by 32 publications

References 31 publications

Coordinate Transformation-Free Observer-Based Adaptive Estimation of Distorted Single-Phase Grid Voltage Signal

Coordinate Transformation-Free Observer-Based Adaptive Estimation of Distorted Single-Phase Grid Voltage Signal

Robust Deadbeat Predictive Power Control With a Discrete-Time Disturbance Observer for PWM Rectifiers Under Unbalanced Grid Conditions

Global accurate estimation of positive‐ and negative‐sequence voltage components for variable frequency AC systems

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