Harmonic Resonance Investigation of a Multi-Inverter Grid-Connected System Using Resonance Modal Analysis

Hong, Lucheng; Shu, Wantao; Wang, Jianhua; Rizwan, Mian

doi:10.1109/tpwrd.2018.2877966

Cited by 71 publications

(43 citation statements)

References 31 publications

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“…where V dc denotes the constant DC bus voltage, D p, ω p and D p, 2ω 0 − ω p represent the small signal responses of duty radio. The small signal models of current controller in dq domain also can be derived at frequency ω p − ω 0 and ω 0 − ω p , and are shown in (16) and (17), respectively. In (16) and (17), V cr denotes the amplitude of carrier signal which is equal to half of the DC bus voltage, G c ω p is the current controller, and G d ω p is the emulated delay effect.…”

Section: Modelling Of Single Equivalent Inverter Admittancementioning

confidence: 99%

“…Combining the models of power stage circuit (14), (15) and current controller (16), (17) through Park transformation model (10), (11), self-admittance Y SA and accompanying-admittance Y AA for the inverter itself can be derived as shown in (18) and (19).…”

Section: Modelling Of Single Equivalent Inverter Admittancementioning

confidence: 99%

“…Stability concern of the multi-inverter grid-connected system has been reported in the literature [16][17][18][19]. A harmonic instability analysis method using the state-space modelling and participation analysis was proposed in [16].…”

Section: Introductionmentioning

confidence: 99%

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Single stationary domain equivalent inverter admittance for three‐phase grid‐inverter system considering the interaction between grid and inverter

Zou

Wang

et al. 2019

IET Power Electronics

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Admittance matrix has been used to represent the characteristics of three-phase inverter for grid-inverter system stability evaluation in both stationary, sequence, and dq domain. For the dq domain admittance matrix, the PLL and Park transformation introduce additional dynamics during the admittance measurement that may influence the application of dq model. For the stationary and sequence domain admittance matrix, the model measurement is not affected by the above additional parts but may also encounter other difficulties in actual measurement. First, current frequency response analyser (FRA) is not able to perform two-frequency measurement required by the admittance matrix. Second, practical limitations exist in the course of solving complex-valued admittance matrix equations. Here, a single stationary domain equivalent admittance of three-phase inverter for grid-inverter system with considering the interaction between grid and inverter is defined so that the above two difficulties can be avoided. Then, an equivalent admittance model of prototype inverter is constructed for stability analysis of the grid-inverter system using Nyquist stability criterion, instead of the generalised Nyquist criterion (GNC). The effectiveness of the proposed equivalent inverter admittance model is validated through simulation and experiment verification.

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Section: Modelling Of Single Equivalent Inverter Admittancementioning

confidence: 99%

Section: Modelling Of Single Equivalent Inverter Admittancementioning

confidence: 99%

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Single stationary domain equivalent inverter admittance for three‐phase grid‐inverter system considering the interaction between grid and inverter

Zou

Wang

et al. 2019

IET Power Electronics

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“…Several studies have been conducted to mitigate the interactive resonance by introducing a virtual harmonic resistance [5], an active damper based on a high-bandwidth power converter [8], or capacitor current-based active damping [9][10][11]. The interactive resonance causes a mutual current-also known as an interactive current-which circulates among inverters instead of flowing into the grid.…”

Section: Literature Reviewmentioning

confidence: 99%

“…current regulation of any other j inverters. The control plant, which comprises multi-parallel GCIs in the discrete time domain is represented as a block-diagram according to Equation Energies 2019, 12, 4363 7 of 21(9). With the consideration of the zero-order-hold (ZOH) effect inFigure 3, the discrete representations of G d plant (s) and G d coupling (s) are given as[24] …”

mentioning

confidence: 99%

Active Disturbance Rejection Control Scheme for Reducing Mutual Current and Harmonics in Multi-Parallel Grid-Connected Inverters

Saleem

Kim

et al. 2019

Energies

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With the increasing penetration of renewable energy sources into modern power systems, parallel inverters with LCL filters are commonly employed in the grid interface, giving rise to potential resonance problems. Among the different resonances, interactive resonance is triggered by interaction among inverters when different current references are applied to parallel inverters. It may also feature a mutual current that circulates among inverters instead of flowing into the grid and introduces harmonics or instability in the control system. In this paper, active disturbance rejection control based on a reduced-order extended state observer (RESO) was proposed for parallel inverters. With the proposed scheme, the interaction between inverters is considered as an exogenous disturbance caused by other parallel inverters, estimated by the RESO, and rejected by the controller. In the results, the mutual current and interactive harmonics, calculated via fast Fourier transform, were reduced with the proposed control scheme. Thus, the lower total harmonic distortion of each current was achieved. Additionally, the robust stability and less model-dependent control design are the other additive advantages over the derivative filtered capacitor voltage feedforward-based active damping using PI control. The simulation and real-time experimental results of the conventional and proposed scheme, obtained using the hardware-in-loop, were presented to verify the theoretical analysis under the similar and different current reference cases.

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Active Damping Resonance Suppression and Optimization of Photovoltaic Cluster Grid Connected System

Yuan

Shi

et al. 2021

J. Electr. Eng. Technol.

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In order to effectively suppress the resonance problem of photovoltaic grid-connected system, an optimization method of active damping resonance suppression is proposed by combining active damping notch control method and active damper method. The resonance mechanism of photovoltaic grid-connected system is analyzed based on frequency domain analysis method. The notch filter is added into the active damping control method, and the active damping of the system is enhanced by using the notch characteristics. The virtual impedance is introduced in parallel with the active damper at the common bus to increase the system damping, which can suppress the system resonance effectively. Finally, the Matlab/Simulink simulation results show that the resonance suppression of photovoltaic grid-connected system can obviously improve the voltage waveform of the common bus, and make the total harmonic distortion rate of the common bus reach 1.07%, which is 0.55% lower than that of the single active damping notch control method, and the higher harmonic suppression effect is more obvious.

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Harmonic Resonance Investigation of a Multi-Inverter Grid-Connected System Using Resonance Modal Analysis

Cited by 71 publications

References 31 publications

Single stationary domain equivalent inverter admittance for three‐phase grid‐inverter system considering the interaction between grid and inverter

Single stationary domain equivalent inverter admittance for three‐phase grid‐inverter system considering the interaction between grid and inverter

Active Disturbance Rejection Control Scheme for Reducing Mutual Current and Harmonics in Multi-Parallel Grid-Connected Inverters

Active Damping Resonance Suppression and Optimization of Photovoltaic Cluster Grid Connected System

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