Damping Oscillation and Removing Resonance in a RE Based DC Microgrids

Habibullah, Mohammad; Bhumkittipich, Krischonme; Mithulananthan, Nadarajah; Sharma, Rahul; Zare, Firuz

doi:10.1109/access.2021.3135033

Cited by 6 publications

(5 citation statements)

References 22 publications

(36 reference statements)

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“…The Jacobian matrix of the initial iteration is expressed as Equation (23) shows that C 2 and C 3 had a slight effect on the resonance frequency f = 714 Hz. Compared with the MFS of C 4 (−4.125 × 10 6 Hz/F), their sensitivities were only −0.069 × 10 6 and −0.837 × 10 6 Hz/F, respectively.…”

Section: Accuracy Of Modal Frequency Sensitivitymentioning

confidence: 99%

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Harmonic impedance optimization scheme for multi‐resonance systems to suppress resonance

Sun,

Lei,

Dai

et al. 2024

IET Generation Trans & Dist

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Harmonic resonance is caused by harmonic source matching resonance frequency and presents the characteristics of decentralization and whole network in modern grids. The current resonance suppression methods mainly focus on reducing the harmonic source, and are suitable for single‐site and small‐scale grids. This paper presents a new method for suppressing parallel resonance at system level. The holistic harmonic resonance is suppressed by reducing the harmonic impedance. In addition, new resonances are prevented by weakening the coupling between resonance and non‐resonance frequencies. The resonance modal analysis and resonance frequency shift (RFS) are employed to optimize harmonic impedance. Simulation results indicate that the capacitance parameter has higher sensitivity and is theoretically more suitable for RFS. Considering the accuracy of modal frequency sensitivity, a variable‐limit genetic algorithm for iteration is proposed. The validity of the proposed method was verified using an IEEE 14‐bus test network.

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Section: Accuracy Of Modal Frequency Sensitivitymentioning

confidence: 99%

“…Besides harmonic emission, another aspect that affects harmonic resonance is impedance distribution [22,23]. From the latter aspect, harmonic resonance can be mitigated by reducing harmonic impedance.…”

Section: Introductionmentioning

confidence: 99%

Harmonic impedance optimization scheme for multi‐resonance systems to suppress resonance

Sun,

Lei,

Dai

et al. 2024

IET Generation Trans & Dist

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show abstract

“…It is, however, not possible to identify the exact source of disturbance from the impedance scanning. Thus, to identify the exact source of the oscillation, a Fast Fourier Transform (FFT) analysis is conducted [56]. Initially, an AC source with a frequency of 580 Hz and amplitude of 500mV is introduced to the source side of the boost converter.…”

Section: B Fast Fourier Transform (Fft) Analysismentioning

confidence: 99%

Modular Open Source Solar Photovoltaic-Powered DC Nanogrids with Efficient Energy Management System

Rahman,

Pearce

2024

jsesd

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Initially the concept of a DC nanogrid was focused on supplying power to individual homes. Techno-economic advances in photovoltaic (PV) technology have enabled solar PV stand-alone nanogrids to power individual devices using device-specific architectures. To reduce costs and increase accessibility for a wider range of people, a modular open-source system is needed to cover all applications at once. This article introduces a modular PV-powered nanogrid system, consisting of a do it yourself (DIY) PV system with batteries to allow for off-grid power. The resultant open-source modular DC nanogrid can deliver DC power to loads of different voltage levels, which is possible because of the efficient and parametric energy management system (EMS) that selects modes of operation for the grid based on DC bus voltage and state of charge of batteries. Simulation results verify the coordination between the EMS and the PV-battery system under varying PV power generation and load conditions. This EMS has potential to enable easy personalization of a vast area of applications and expand appropriate technology for isolated communities. A thorough stability analysis has been conducted, leading to the development of an LQR (Linear Quadratic Regulator) controller as a replacement for the conventional PI (Proportional - Integral) controllers for better transient stability of the system.

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“…In this work, the suitability and the performance of three control design methods are illustrated. At first, the LQR control proposed in [20,21] has been developed in this work. For the sake of brevity and to avoid repetition, the details about the LQR control implementation are not illustrated here.…”

Section: Overview Of Control Tuningmentioning

confidence: 99%

“…Furthermore, few works have proposed controller design/retuning for DC microgrid stability enhancement [20]. For example, the LQR-based control is proposed in [21] to enhance the DC microgrid's low frequency and resonance performance. However, the LQR controller needs to be more robust, with a complex and high-order model, which is challenging to implement.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Oscillation and Resonance in the Renewable Integrated DC-Microgrid

et al. 2023

Self Cite

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This paper assessed the small-signal stability performance of a multi-converter-based direct current microgrid (DCMG). The oscillation and potential interactions between critical modes are evaluated. First, the complete analytical model of the DCMG is developed with the converter and associated controllers. Three methodologies, impedance scanning, eigenvalue analysis, and time-domain simulation, along with the fast Fourier transform (FFT) analysis, have been used to comprehensively investigate the oscillations and interactions. The simulation results show inherent weak modes, with a wide range of oscillations in the studied DCMG, which may destabilize the system under disturbances. Based on the sensitivity analysis, controller gains and DC-link capacitance are identified as the most critical parameters and substantially influence the weak modes leading to oscillations, interactions, and resonance. Finally, the performance of the various control synthesis methods is compared. This examination would help the researchers, planning, and design engineers to design and stably operate a multi converter-based DC microgrid.

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Damping Oscillation and Removing Resonance in a RE Based DC Microgrids

Abstract: Date of publication xxxx 00, 0000, date of current version xxxx 00, 0000.

Cited by 6 publications

References 22 publications

Harmonic impedance optimization scheme for multi‐resonance systems to suppress resonance

Harmonic impedance optimization scheme for multi‐resonance systems to suppress resonance

Modular Open Source Solar Photovoltaic-Powered DC Nanogrids with Efficient Energy Management System

Investigation of Oscillation and Resonance in the Renewable Integrated DC-Microgrid

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