Performance analysis of adaptive notch filter active damping methods for grid-connected converters under a varying grid impedance

Rufa'I, Nabila Ahmed; Zhang, Li; Chong, Benjamin

doi:10.1109/ptc.2017.7981203

Cited by 10 publications

(15 citation statements)

References 18 publications

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“…However, at its resonant frequency, the capacitive and inductive impedances cancel out, producing a negligible resistance with an infinite gain. An ANF is positioned in the forward path of the closed loop current control system, introducing a complex conjugate pair of zeros which cancel out the LCL filter resonant poles [6]. ANF tuning is performed using the discrete Fourier transform (DFT) algorithm as implemented in [6].…”

Section: System Configuration and Transfer Functionsmentioning

confidence: 99%

“…An ANF is positioned in the forward path of the closed loop current control system, introducing a complex conjugate pair of zeros which cancel out the LCL filter resonant poles [6]. ANF tuning is performed using the discrete Fourier transform (DFT) algorithm as implemented in [6]. The DFT filter is applied to the grid side current, ig from which the band with the highest frequency is identified as the resonant frequency.…”

Section: System Configuration and Transfer Functionsmentioning

confidence: 99%

“…As the resonant frequency in (2) varies with the grid inductance, Lg adaptive active damping can only be achieved when is continuously monitored to update in (3). A DFT filter is therefore applied to monitor the variation and uses the new grid information to retune the NF parameters in (3) [6]. This makes NF adaptive to the grid impedance variation.…”

Section: System Configuration and Transfer Functionsmentioning

confidence: 99%

“…The PI controller tracks the sinusoidal reference with a visible steady state error, which significantly reduces when the feed forward voltage is considered. To completely eliminate the error, a logical solution is to increase KI such that a large gain occurs at the reference frequency based on (6). Alternatively, the voltage feedforward term can be increased.…”

Section: B Ac Reference Trackingmentioning

confidence: 99%

See 3 more Smart Citations

Comparison of PI and PR Controllers with Adaptive Notch Filter for LCL Filtered Grid-Tie Converters under Weak Grid

Rufa'I

Zhang

Chong

2019

2019 IEEE PES/IAS PowerAfrica

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Renewable energy sources such as solar and wind require power converters and harmonic filters for interconnection with the grid. Central to the operation of such systems is the controller, which ensures that the maximum possible power is transferred from the source to the grid. Of these controllers, the proportional-integral (PI) controller is the most commonly used, owing to its ease of implementation. This report therefore aims at comparing the operation of the PI controller with its stationary reference frame equivalent known as the proportional-resonant (PR) controller. Both controllers are implemented in the voltage oriented control scheme for a three phase converter connected to a weak grid through an LCL filter. The characteristics of the controllers are analysed and compared in both the time and frequency domains. Simulation results validate the performance of each controller.

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Section: System Configuration and Transfer Functionsmentioning

confidence: 99%

Section: System Configuration and Transfer Functionsmentioning

confidence: 99%

Section: System Configuration and Transfer Functionsmentioning

confidence: 99%

Section: B Ac Reference Trackingmentioning

confidence: 99%

See 2 more Smart Citations

Comparison of PI and PR Controllers with Adaptive Notch Filter for LCL Filtered Grid-Tie Converters under Weak Grid

Rufa'I

Zhang

Chong

2019

2019 IEEE PES/IAS PowerAfrica

Self Cite

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“…In additional, the grid-side online impedance estimation methods based on the power relationship and voltage vector relationship were presented respectively in Reference [22][23][24][25][26], these methods only consider the ground grid connected converter situation, the parameters of grid network changed largely and the control methods with parameter estimation is not limited to the MPC control. The Uncertainty of parameters of PWM rectifiers in ACVF electrical power system cannot be investigated, the characteristics of ac side impedance parameters changed with main AC generator frequency with the load profile.…”

Section: Introductionmentioning

confidence: 99%

A Novel Robust Model Predictive Controller for Aerospace Three-Phase PWM Rectifiers

et al. 2018

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This paper presents a novel Model Predictive Direct Power Control (MPDPC) approach for the pulse width modulation (PWM) rectifiers in the Aircraft Alternating Current Variable Frequency (ACVF) power system. The control performance of rectifiers may be largely affected by variations in the AC side impedance, especially for systems with limited power volume system. A novel idea for estimating the impedance variation based on the Bayesian estimation, using an algorithm embedded in MPDPC is presented in this paper. The input filter inductance and its equivalent series resistance (ESR) of PWM rectifiers are estimated in this algorithm by measuring the input current and input voltage in each cycle with the probability Bayesian estimation theory. This novel estimation method can overcome the shortcomings of traditional data based estimation methods such as least square estimation (LSE), which achieves poor estimation results with the small samples data set. In ACVF systems, the effect on the parameters estimation accuracy caused by the number of sampling points in one cycle is also analyzed in detail by simulation. The validity of this method is verified by the digital and Hard-in-loop simulation compared with other estimation methods such as the least square estimation method. The experimental testing results show that the proposed estimation algorithm can improve the robustness and the control performance of the MPDPC under the condition of the uncertainty of the AC side parameters of the three-phase PWM rectifiers in aircraft electrical power system.

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Incorporation of Modified Second-Order Adaptive Filter in MFGCI for Harmonic Mitigation of Microgrid

Keerthiga¹,

Kumar²,

Haland³

2020

Proceedings of International Conference on Artificial Intelligence, Smart Grid and Smart City Applications

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Performance analysis of adaptive notch filter active damping methods for grid-connected converters under a varying grid impedance

Cited by 10 publications

References 18 publications

Comparison of PI and PR Controllers with Adaptive Notch Filter for LCL Filtered Grid-Tie Converters under Weak Grid

Comparison of PI and PR Controllers with Adaptive Notch Filter for LCL Filtered Grid-Tie Converters under Weak Grid

A Novel Robust Model Predictive Controller for Aerospace Three-Phase PWM Rectifiers

Incorporation of Modified Second-Order Adaptive Filter in MFGCI for Harmonic Mitigation of Microgrid

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