A5004099265- Islanding Detection in Power Systems
- Microgrid Control and Optimization
- HVDC Systems and Fault Protection
- Power Systems and Renewable Energy
Guangxi University
2022-2023
Capacitor-current-feedback active damping has been widely adopted in digitally controlled LCL-type grid-connected inverters (GCIs). However, their digital control delay causes the system stability to deteriorate within a negative range. Particularly, weak grid, such GCIs are prone be unstable against grid impedance variation. To address above problem, compensation strategy is proposed for an GCI, which second-order low-pass filter (LPF) inserted into capacitor-current-feedback path. This...
The Grid-Connected Inverter (GCI) can be considered a gray box when circuit and controller parameters are missing due to intellectual property rights or parameter variations caused by aging, which poses an impediment assessing the stability of system. This paper presents gray-box analysis method based on impedance identification GCI considering synchronization dynamics. frequency responses measured scanning dq-frame. Meanwhile, influence dynamics background harmonics is theoretically...