Unbalanced control of grid-side converter based on DSOGI-PLL

Jin, Lijun; Miao-Miao, Jiang; Yang, Guo Biao; Cheng, Yifan; Li, Rongzheng; Zhu, Hongping; Zhou, Ke

doi:10.1109/iciea.2015.7334279

Cited by 8 publications

(5 citation statements)

References 9 publications

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“…Addressing the imperative need for a precise and swift approximation of grid information within grid-tied PV systems, Phase-Locked Loop (PLL) schemes have been employed due to their recognized superiority in performance, as noted in [30]. The widely adopted DSOGI-PLL stands out for its structural simplicity, especially in three-phase grid synchronization, as corroborated in [30]. However, the conventional DSOGI-PLL grapples with substantial performance degradation under unbalanced grid conditions and distortions.…”

Section: Enhanced Dsogi-pllmentioning

confidence: 99%

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Advanced Control Strategies for Photovoltaic Power Quality and Maximum Power Point Tracking Optimization

Nkambule,

Nabil Hasan,

Shongwe

2024

IEEE Access

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This paper introduces an innovative Expectation-Conjugate-Gradient (ECG) approach designed for the management of the interfacing inverter in a grid-connected fixed tilt bifacial Photovoltaic (PV) system. The focus of this algorithm is to address current harmonics issues and elevate power quality. Additionally, the proposed control strategy integrates with an Enhanced Dual second-order generalized integrator phase-locked loop (EDSOGI-PLL), enhanced with a Savitzky-Golay Filter (SGF) to achieve grid synchronization, mitigate voltage harmonics, and estimate symmetrical components during unbalanced grid conditions. The state-of-art Double deep Q-network (DDQN) maximum power point tracking algorithm is introduced, integrating centralized start-up condition computation to stabilize voltage levels at the shared DClink bus terminal. Key benefits include reduced harmonics, enhanced stability, adaptive control, and minimal computational load. Simulation confirms compliance with IEEE 519 Standards, THD < 3%, PF ≈ 1, and reveal a significant reduction in CO2 emissions.

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Section: Enhanced Dsogi-pllmentioning

confidence: 99%

“…The performance of the algorithms is evaluated using three key metrics: Root Mean Squared Error (RMSE), Mean Absolute Error (MAE), and Mean Squared Error (MSE). These metrics, calculated using equations ( 28) to (30), provide quantitative measures of the algorithm's accuracy and effectiveness in predicting outcomes.…”

Section: A Case Study 1 -Fixed Tilt Approachmentioning

confidence: 99%

Advanced Control Strategies for Photovoltaic Power Quality and Maximum Power Point Tracking Optimization

Nkambule,

Nabil Hasan,

Shongwe

2024

IEEE Access

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“…It is obvious from (11) that the control errors will diminish to zero and the references will be tracked provided that the estimation of f PQη is such that fPQη → f PQη , ∀ K PQη > 0.…”

Section: Control Formulationmentioning

confidence: 99%

“…The role of power converters is very unique since the converters are the interfaces enabling the synchronization, voltage control, current control and power flow control in the MG and SG [5,7,8]. A number of studies can be found in the literature regarding the control of three-phase VSI, specifically in view of controlling the imbalance of power in the MG [9][10][11][12][13]. All of these established works offer complexity, since they are designed to maintain pure sinusoidal voltages as the output of the VSI, whose conception dates back to the 1980s due to the stringent supply requirements of the three-phase motors [14][15][16][17].…”

mentioning

confidence: 99%

Utilizing Full Degrees of Freedom of Control in Voltage Source Inverters to Support Micro-Grid with Symmetric and Asymmetric Voltage Requirements

et al. 2023

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This article proposes a novel equivalent control method for voltage source inverters (VSI) with disturbance observers (DOB) to support the symmetric and asymmetric voltage requirements of a micro-grid (MG) while also matching the MG output power requirements. The method leverages the degrees of freedom (DOF) of the VSI under symmetric and asymmetric MG voltage conditions by utilizing the mean-point voltage of the MG, which is often overlooked in literature studies due to this being grounded. The method enables the three-phase inverter to generate voltages as needed by the MG inconsistently due to changing loads in the MG circuits or phases. The method is also insensitive to disturbances because of the DOB, being part of the controller. The proposed method is validated under both the balance and imbalance voltage demands of the MG. The mean voltage of the MG is used as a set-point to be corroborated as a mean voltage at the inverter’s output, in addition to active-reactive power references. The novel model is developed by augmenting the new, mean-point voltage as part of the system dynamics. The proposed method is simulated in MATLAB/Simulink® and is verified for its hardiness and effectiveness.

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“…Based on the above, the positive and negative sequence decomposition link has become an important part of the wind farm control strategy. At present, the most common methods of phase-locked loop based on positive sequence components are the dual second-order, generalised integrator phase-locked loop (DSOGI-PLL) [6], and the decoupled double synchronous reference frame phase-locked loop (DDSRF-PLL) [7]. Compared with DSOGI-PLL, the algorithm structure of DDSRF-PLL is more complex, and the decoupling structure of DDSRF-PLL is mainly aimed at eliminating the infuence of the negative sequence fundamental frequency component, while the ability to resist low harmonic disturbance is relatively weak [8,9].…”

Section: Introductionmentioning

confidence: 99%

Calculation Method and Characteristic Analysis for Fault Current of Permanent Magnet Direct-Drive Wind Power System considering Positive and Negative Sequence Decomposition

Li,

Zhong,

Wen

et al. 2024

International Transactions on Electrical Energy Systems

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In view of the fact that the influence of positive and negative sequence decomposition, which is widely used in positive and negative sequence decoupling control in control system, on the fault current calculation process is not deeply considered in the existing transient analysis methods of permanent magnet direct-drive wind farm short circuit current, this paper proposes a transient short circuit current calculation model that takes into account positive and negative sequence decomposition. The influence of the transient characteristics of positive and negative sequence decomposition on the control system is studied, and the mechanism of its action on the transient change of short circuit current is revealed. The positive and negative sequence decoupling processes of the circuit equation are modified, and the characteristics of the coupling equation are analyzed. The difference in the converter output voltage between the circuit equation and the control equation and the depth of its influence on the calculation process is revealed. On the basis of quantifying the difference at the converter output voltage, the circuit equation and the control equation are combined to form a short-circuit current calculation model with positive and negative sequence decomposition, which accurately characterizes the transient characteristics of fault current under different voltage drops and effectively improves the accuracy of the calculation results.

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Unbalanced control of grid-side converter based on DSOGI-PLL

Cited by 8 publications

References 9 publications

Advanced Control Strategies for Photovoltaic Power Quality and Maximum Power Point Tracking Optimization

Advanced Control Strategies for Photovoltaic Power Quality and Maximum Power Point Tracking Optimization

Utilizing Full Degrees of Freedom of Control in Voltage Source Inverters to Support Micro-Grid with Symmetric and Asymmetric Voltage Requirements

Calculation Method and Characteristic Analysis for Fault Current of Permanent Magnet Direct-Drive Wind Power System considering Positive and Negative Sequence Decomposition

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