Robust Control and Optimization Method for Single-Phase Grid-Connected Inverters Based on All-Pass-Filter Phase-Locked Loop in Weak Grid

Yang, Lijun; Cao, Tian; Chen, Huapeng; Dong, Xinwei; Zhang, Shuyuan

doi:10.3390/en15197355

Cited by 6 publications

(5 citation statements)

References 33 publications

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“…This reduction in time delay enhances the frequency estimation. In this structure, the input voltage is written as a summation of the positive component (v p e jωt+∅ 1 ) and negative component (v n e −jωt+∅ 1 ) as in Equation (63), where the phase shift angles ∅ 1 and ∅ 2 are neglected for simplicity:…”

Section: Non-adaptive 1-𝜙 Cdsc-pll2mentioning

confidence: 99%

“…The all-pass filter PLL (APF-PLL) is a simple and stable performance method widely used in grid synchronization. However, APF-PLL performance degrades under distorted grid conditions, resulting in low-frequency oscillations appearing in the estimated phase and frequency [60][61][62][63][64]. To solve this problem, the work in [3] modified APF-PLLs to suppress harmonics and the DC offset effectively by using the band-pass filter (BPF) as a pre-filter of APF-PLL in the first structure, and the APF-PLL is integrated with the harmonic decoupling network (HDN) and multiple pre-filters.…”

Section: Introductionmentioning

confidence: 99%

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Advanced Single-Phase PLL-Based Transfer Delay Operators: A Comprehensive Review and Optimal Loop Filter Design

Bany Fawaz,

Smadi,

Albatran

et al. 2024

Energies

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In recent years, several research works have addressed and developed the phase-locked loop (PLL) in single-phase grid-connected converters with different structures and properties. Each has merits and demerits, such as a complex structure, high computational burden, and slow transient response. This paper aims to comprehensively review advanced single-phase PLLs based on transport delay operators to realize signal orthogonality. A deep insight into the PLLs’ small-signal modeling, main characteristics, stability analysis, and loop filter design are provided in this paper. The main advantages and drawbacks are explained for each type of PLL in terms of different performance indexes, such as settling time, estimation error, and ripples in the estimated grid information. This paper also aims to provide optimal tuning and design of the loop filter gains from the large-signal model point of view, including all the nonlinearities, adopting the stochastic optimization method. All simulations are implemented using the MATLAB/Simulink 2018b environment to validate all theoretical analyses of this paper. The sampling and nominal frequencies are set to be 100 kHz and 50 Hz throughout all the simulation studies.

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Section: Non-adaptive 1-𝜙 Cdsc-pll2mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Advanced Single-Phase PLL-Based Transfer Delay Operators: A Comprehensive Review and Optimal Loop Filter Design

Bany Fawaz,

Smadi,

Albatran

et al. 2024

Energies

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“…Simultaneously, owing to the small equivalent resistance R s of the parallel resonant circuit, a large harmonic voltage is generated, which in turn generates a large harmonic resonant current in the parallel resonant circuit. This can severely affect the voltage at the PCC node and degrade the power quality of the system, thereby affecting the normal power consumption of customers [35].…”

Section: Composite Control Strategies and Issuesmentioning

confidence: 99%

Research on an Adaptive Compound Control Strategy of a Hybrid Compensation System

2023

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This paper investigates the parallel harmonic resonance problem for hybrid compensation systems, consisting of active power filters and thyristor-switched capacitors, and proposes an adaptive composite control strategy for solving the parallel harmonic resonance problem that may arise in practical applications of hybrid compensation systems. In practice, a hybrid compensation system can effectively solve harmonic and reactive power problems, but the equivalent reactance of the thyristor-switched capacitor and the supply line may form a parallel resonant circuit, which may generate parallel harmonic resonance when excited by a harmonic source at the non-linear load side, affecting the quality and stable operation of the system. The adaptive composite control strategy employs a second-order generalized integrator-frequency-locked loop (SOGI-FLL) to extract the harmonic voltage at the point of common coupling (PCC) and generate an adaptive damping current command using an adaptive algorithm, which adaptively adjusts the parameters of the resonance suppression controller through harmonic content limitation. Matlab/Simulink simulations show that the method effectively achieves harmonic resonance suppression of the power supply system under complex operating conditions, thus ensuring the stable operation and power quality of the power supply system. Therefore, the proposed control strategy is feasible and effective.

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“…Synchronization techniques are employed to achieve fast and accurate grid synchronization between power electronics converters and the grid. Phase Locked Loop (PLL) algorithms are probably the most popular and widely used techniques for grid synchronization owing to their robustness and effectiveness [5][6][7][8][9]. Several research were done in designing PLLs for grid synchronization [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

“…Recently, researchers have conducted several sorts of single-phase PLL research, and numerous single-phase PLL variants have been proposed and examined. The most popular techniques for creating an orthogonal signal include the Inverse Park Approach (IPA) [21], Transfer Delay (TD) [10,22,23], Second Order Generalized Integrator (SOGI) [15][16][17]24,25], Kalman Filter (KF) [14,26], All-Pass Filter [18,19], and Moving Average Filter (MAF) [27].…”

Section: Introductionmentioning

confidence: 99%

Simple solution of DC-offset rejection based phase-locked loop for single-phase grid-connected converters

Bany Issa,

Al Muala,

Bello Bugallo

2024

Renew. Energy Environ. Sustain.

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Distributed Generators (DG) systems based on Renewable Energy Sources (RES) such as hydro, wind, and solar power plants have been spread widely due to their lower cost and the advanced capability of connecting them with the grid. The power generated from the DG must be shaped to be interfaced with the grid employing power electronics converters. The grid-connected power electronics converters must be synchronized with the grid (i.e., the same fundamental component of the grid frequency, phase, amplitude, and sequence). Synchronization techniques are employed to achieve accurate and fast grid synchronization between the converter and the grid. The existence of (DC-offset) in the input of Phase Locked Loop (PLL) caused synchronization problems as it causes oscillations in the estimated fundamental grid phase, frequency, and amplitude. In addition, the closed-loop system stability can be affected. This work proposes a simple technique for grid synchronization based on PLL with a phase angle correction. The proposed method was developed using Transfer Delay (TD) and Delay Signal Cancelation (DSC) operators; then, the small single model and stability analysis was employed. Several scenarios were developed to compare the proposed method with previous methods using MATLAB/Simulink tool. The scenarios involve introducing phase jumps, DC offsets, and amplitude changes to the grid voltage. Additionally, the grid frequency was also changed. The results show that the proposed PLL can solved the DC-offset problem using any delay time and fully synchronized with the grid. Moreover, the proposed PLL has the fastest dynamic response and shortest synchronization time over the other methods from literature.

show abstract

Robust Control and Optimization Method for Single-Phase Grid-Connected Inverters Based on All-Pass-Filter Phase-Locked Loop in Weak Grid

Cited by 6 publications

References 33 publications

Advanced Single-Phase PLL-Based Transfer Delay Operators: A Comprehensive Review and Optimal Loop Filter Design

Advanced Single-Phase PLL-Based Transfer Delay Operators: A Comprehensive Review and Optimal Loop Filter Design

Research on an Adaptive Compound Control Strategy of a Hybrid Compensation System

Simple solution of DC-offset rejection based phase-locked loop for single-phase grid-connected converters

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