Stability Analysis of LCL-Type Grid-Connected Inverter Under Single-Loop Inverter-Side Current Control With Capacitor Voltage Feedforward

2018 ◽  
Vol 14 (2) ◽  
pp. 691-702 ◽  
Author(s):  
Bangyin Liu ◽  
Qikang Wei ◽  
Changyue Zou ◽  
Shanxu Duan
Keyword(s):  
Stability Analysis ◽  
Current Control ◽  
Single Loop ◽  
Capacitor Voltage ◽  
Grid Connected Inverter

scholarly journals Coupling Influence on the dq Impedance Stability Analysis for the Three-Phase Grid-Connected Inverter

Energies ◽  
2019 ◽  
Vol 12 (19) ◽  
pp. 3676
Author(s):  
Chuanyue Li ◽  
Taoufik Qoria ◽  
Frederic Colas ◽  
Jun Liang ◽  
Wenlong Ming ◽  
...  
Keyword(s):  
Stability Analysis ◽  
Nyquist Plot ◽  
Current Control ◽  
Impedance Ratio ◽  
Three Phase ◽  
Grid Impedance ◽  
Nyquist Criterion ◽  
Grid Connected Inverter ◽  
The Stability ◽  
The Right

The dq impedance stability analysis for a grid-connected current-control inverter is based on the impedance ratio matrix. However, the coupled matrix brings difficulties in deriving its eigenvalues for the analysis based on the general Nyquist criterion. If the couplings are ignored for simplification, unacceptable errors will be present in the analysis. In this paper, the influence of the couplings on the dq impedance stability analysis is studied. To take the couplings into account simply, the determinant-based impedance stability analysis is used. The mechanism between the determinant of the impedance-ratio matrix and the inverter stability is unveiled. Compared to the eigenvalues-based analysis, only one determinant rather than two eigenvalue s-function is required for the stability analysis. One Nyquist plot or pole map can be applied to the determinant to check the right-half-plane poles. The accuracy of the determinant-based stability analysis is also checked by comparing with the state-space stability analysis method. For the stability analysis, the coupling influence on the current control, the phase-locked loop, and the grid impedance are studied. The errors can be 10% in the stability analysis if the couplings are ignored.

scholarly journals Current control of grid-connected inverter using integral sliding mode control and resonant compensation

2019 ◽  
Vol 10 (2) ◽  
pp. 1022
Author(s):  
Seung-Jin Yoon ◽  
Thanh Van Nguyen ◽  
Kyeong-Hwa Kim
Keyword(s):  
Sliding Mode Control ◽  
Sliding Mode ◽  
Voltage Control ◽  
Current Control ◽  
Control Loop ◽  
Integral Sliding Mode Control ◽  
Integral Sliding Mode ◽  
Distorted Grid ◽  
Capacitor Voltage ◽  
Grid Connected Inverter

<p>To eliminate the adverse effect from parameter variations as well as distorted grid conditions, a current control scheme of an LCL-filtered grid-connected inverter using a discrete integral sliding mode control (ISMC) and resonant compensation is presented. The proposed scheme is constructed based on the cascaded multiloop structure, in which three control loops are composed of grid-side current control, capacitor voltage control, and inverter-side current control. An active damping to suppress the resonance caused by LCL filter can be effectively realized by means of the inverter-side feedback control loop. Furthermore, the seamless transfer operation between the grid-connected mode and islanded mode is achieved by the capacitor voltage control loop. To retain a high tracking performance and robustness of the ISMC as well as an excellent harmonic compensation capability of the resonant control (RC) scheme at the same time, two control methods are combined in the proposed current controller. As a result, the proposed scheme yields a high quality of the injected grid currents and fast dynamic response even under distorted grid conditions. Furthermore, to reduce the number of sensors, a discrete-time reduced-order state observer is introduced. Simulation and experimental results are presented to demonstrate the effectiveness of the proposed scheme.</p>

scholarly journals A Highly Robust Single-Loop Current Control Scheme for Grid-Connected Inverter With an Improved LCCL Filter Configuration

2018 ◽  
Vol 33 (10) ◽  
pp. 8474-8487 ◽  
Author(s):  
Donghua Pan ◽  
Xinbo Ruan ◽  
Xiongfei Wang ◽  
Frede Blaabjerg ◽  
Xuehua Wang ◽  
...  
Keyword(s):  
Current Control ◽  
Loop Current ◽  
Single Loop ◽  
Control Scheme ◽  
Grid Connected Inverter ◽  
Filter Configuration

Stability Analysis of Sensorless Speed Control for PMSM Considered Current Control System

2018 ◽  
Vol 138 (11) ◽  
pp. 848-856
Author(s):  
Sari Maekawa ◽  
Mariko Sugimoto ◽  
Keiichi Ishida ◽  
Masaya Nogi ◽  
Masaki Kanamori
Keyword(s):  
Control System ◽  
Stability Analysis ◽  
Speed Control ◽  
Current Control

scholarly journals A Decoupled Hybrid Current Control for Improving the Performance of 60° DPWM-Based Three-Phase Grid-Connected Inverter

IEEE Access ◽  
2020 ◽  
Vol 8 ◽  
pp. 876-888
Author(s):  
Yuanbin He ◽  
Bangchao Wang ◽  
Xiaogao Xie ◽  
Lei Shen ◽  
Pingliang Zeng
Keyword(s):  
Current Control ◽  
Three Phase ◽  
Grid Connected Inverter
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