Integrated Design of Filter and Controller Parameters for Low-Switching-Frequency Grid-Connected Inverter Based on Harmonic State-Space Model

Cai, Yuxi; He, Yangyang; Zhang, Haixiao; Zhou, Hongwei; Liu, Jinjun

doi:10.1109/tpel.2023.3241091

Cited by 10 publications

(1 citation statement)

References 33 publications

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“…In addition, some trapping algorithms, observers, and controller parameter optimization can also suppress the corresponding harmonic components [28][29][30][31][32]. In [33], the state space matrix explains the participation degree of the control loops, and a controller design method is proposed considering the current harmonic distortion rate. Virtual impedance is another effective filtering method, and the virtual impedance constructed in [34] effectively reduces the fifth and seventh harmonics, but such methods have high requirements for frequency component extraction.…”

Section: Introductionmentioning

confidence: 99%

Coordinated Mitigation Control for Wideband Harmonic of the Photovoltaic Grid-Connected Inverter

Yang¹,

Liu²,

Shan

et al. 2023

Applied Sciences

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Under the current trend of power electronics in energy systems, a high percentage of renewable energy transports clean energy to the grid through grid-connected inverters. The pulse-width modulation (PWM) technique brings high-order harmonics near to the switching frequency, and LCL filters with low-pass characteristics become the common choice for grid-connected inverters. However, the low-order harmonics caused by nonideal switching characteristics are difficult to filter out, and the new resonance point introduced by the LCL filter causes a security problem for the energy systems. Firstly, the generation mechanism of the 6 k ± 1 order harmonic and high-frequency resonance from a PV grid-connected inverter is analyzed. Then, a virtual resistor is constructed by the active damping method to absorb the resonant component. Meanwhile, this paper also presents an adaptive modulation voltage compensation method to decrease the low-order harmonics. Finally, the actual measured data of user photovoltaic (PV) and multiple comparative simulations verify these theories. Simulation results show that the proposed coordinated control algorithm reduces the peak of the resonance point, and the rate of low-order harmonics mitigation is more than 50%. The proposed method is suitable for various operating conditions.

show abstract

Section: Introductionmentioning

confidence: 99%

Coordinated Mitigation Control for Wideband Harmonic of the Photovoltaic Grid-Connected Inverter

Yang¹,

Liu²,

Shan

et al. 2023

Applied Sciences

View full text Add to dashboard Cite

show abstract

Resonant Damping Analysis of Output Filter of Grid-Connected Inverters

Zhou

2023

J. Electr. Eng. Technol.

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Comprehensive design method of controller parameters for three‐phase LCL‐type grid‐connected inverter based on D‐partition

Ma,

Xiao,

Wang

et al. 2024

IET Power Electronics

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The LCL‐type inverter is a core component in grid‐connected renewable energy systems, with its performance heavily influenced by the controller. Conventional design methods of controller parameters generally rely on approximation or trial and error, making it difficult to optimize parameters for multiple performance indices. This paper proposes a comprehensive design method of controller parameters for a three‐phase LCL‐type grid‐connected inverter based on the D‐partition method, obtaining a multi‐objective parameter stability domain of controller parameters that simultaneously satisfies multiple performance indices, such as gain margin, phase margin, and current loop bandwidth. The stability domain can be visually presented, which can avoid repetitive adjustments. Additionally, the variation trend of the stability domain when there are deviations in the LCL filter parameters is analyzed. Finally, the accuracy and effectiveness of the proposed design method are validated through simulations and experiments, achieving precise parameter design for the controller of LCL grid‐connected inverters even in the presence of deviations in filter parameters.

show abstract

Integrated Design of Filter and Controller Parameters for Low-Switching-Frequency Grid-Connected Inverter Based on Harmonic State-Space Model

Cited by 10 publications

References 33 publications

Coordinated Mitigation Control for Wideband Harmonic of the Photovoltaic Grid-Connected Inverter

Coordinated Mitigation Control for Wideband Harmonic of the Photovoltaic Grid-Connected Inverter

Resonant Damping Analysis of Output Filter of Grid-Connected Inverters

Comprehensive design method of controller parameters for three‐phase LCL‐type grid‐connected inverter based on D‐partition

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