Amplitude-Phase Detection for Power Converters Tied to Unbalanced Grids with Large X/R Ratios

Xiong, Liansong; Liu, Xiaokang; Liu, Lei; Liu, Yonghui

doi:10.1109/tpel.2021.3104591

Cited by 16 publications

(23 citation statements)

References 24 publications

(40 reference statements)

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“…This means that the frequency detection algorithm used in this paper can overcome the influence of fundamental frequency fluctuation and accurately re-estimate the frequency on the premise of ensuring fast convergence. It is worth noting that the traditional amplitude and phase detection time generally exceed 80 ms [27]. The harmonic detection results of the observer are shown in Figure 12.…”

Section: Frequency Fluctuationmentioning

confidence: 98%

An Observer-Based Harmonic Extraction Method with Front SOGI

Sang

et al. 2022

Machines

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With the further development of harmonic pollution in the power system, scientists have carried out research on harmonics. Among them, harmonic detection is the first step in harmonic research. In this paper, a harmonic detection method based on an observer is proposed. This method first uses the cascaded Second-Order Generalized Integration (SOGI) algorithm, which can filter the Direct Current (DC) component of the input signal to extract the fundamental frequency, and then uses a time-varying observer to extract the harmonics. This can be used to extract harmonics from a distorted online grid signal. The effectiveness of the proposed method was evaluated on the Speedgoat Rapid Control Prototype (RCP) platform. The results show that it can complete the convergence within 0.05 s, and the standard deviation after stability will not exceed 1%.

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Section: Frequency Fluctuationmentioning

confidence: 98%

An Observer-Based Harmonic Extraction Method with Front SOGI

Sang

et al. 2022

Machines

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“…D UE to the presence of power electronic devices, unbalanced loads, and impact loads in three-phase distributed systems, a large faulty current, including negative sequence and exponential decay components, can flow into the grid [1]. Specifically, the decaying dc (DDC) component associated with the switching action can be dominant over the unbalanced components and harmonics, leading to a transient current amplitude as large as twice that during the steady state [2]. The compound impact current severely jeopardizes the safe and stable operation of power grids and electrical equipment, causing the undesired relay protection and economic loss.…”

Section: Introductionmentioning

confidence: 99%

“…In the past few years, several efforts, [2], [7], [8], have been made to address these issues, mainly by considering the analytical expression of multiple components in the transient signal. The method in [7] was able to separate the DDC component from the harmonic environment within one grid cycle.…”

Section: Introductionmentioning

confidence: 99%

A Fast Positive-Sequence Component Extraction Method With Multiple Disturbances in Unbalanced Conditions

Liu

Xiu

2022

IEEE Trans. Power Electron.

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Fast and accurate acquisition of current components is a key factor for an active power filter to realize transient control under unbalanced conditions. In this letter, a robust real-time algorithm, which rapidly separates the positivesequence component (PSC) from multiple decaying dc (DDC) components, dc bias component, negative-sequence component, and harmonics, is proposed. To this end, first, the multiple DDC components are detected in the multiple disturbance and unbalanced grid context, by making use of the periodicity of remaining components. The dc bias can be obtained accordingly, followed by the detection of a compound signal encompassing the positive-sequence component, negative-sequence component, and harmonics. Specifically, the compound signal can be extracted precisely, based on the detected DDC and dc bias components, with one grid cycle response time, or approximately, within half grid cycle. A switching logic of the two approaches is designed to shorten the overall convergence time and improve steady-state accuracy. The PSC is then effectively extracted by constructing the virtual orthogonal signal of the compound signal and using dq-frame filtering. Compared with the existing transient control techniques, the proposed scheme guarantees one grid cycle response time and simultaneously suppresses multiple disturbances. Finally, experimental results verify the effectiveness of the proposed method.

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“…In order to achieve accurate, fast, and small overshoot control of PMSM, the key part is to determine the position information and speed of the rotor magnetic pole. Generally speaking, mechanical sensors are installed to collect the specific parameter information of the signal through the photoelectric encoder and other sensors (Bourogaoui et al, 2017;Cao et al, 2020;Xu et al, 2021;Xiong et al, 2022). However, these sensors require the additional mounting space, increase the cost, and reduce the system reliability in environmental constraint.…”

Section: Introductionmentioning

confidence: 99%

SMO-Based Sensorless Control of a Permanent Magnet Synchronous Motor

Liu¹,

Wang²,

Wang³

et al. 2022

Front. Energy Res.

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In order to reduce the chattering caused by the discontinuity of the control function in the traditional sliding mode observer (SMO), this article proposes a sliding mode observer with phase-locked loop (PLL) to estimate the speed and position of the rotor. The back electromotive force (EMF) of a permanent magnet synchronous motor (PMSM) in a static coordinate system is accurately estimated by SMO, and then, PLL is constructed to combine the observed rotor position angle and back EMF to compensate the phase lag in angle estimation so as to obtain a more accurate speed. It solves the problems of poor robustness and complex algorithms in the traditional SMO prediction algorithm. The simulation results show that the SMO with PLL can effectively reduce the system chattering and effectively improve the accuracy of rotor speed and position estimation.

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Amplitude-Phase Detection for Power Converters Tied to Unbalanced Grids with Large X/R Ratios

Cited by 16 publications

References 24 publications

An Observer-Based Harmonic Extraction Method with Front SOGI

An Observer-Based Harmonic Extraction Method with Front SOGI

A Fast Positive-Sequence Component Extraction Method With Multiple Disturbances in Unbalanced Conditions

SMO-Based Sensorless Control of a Permanent Magnet Synchronous Motor

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