Grid-forming (GFM) control is increasingly adopted in grid-connected inverters for frequency support, as a promising solution for the large-scale integration of renewable energy resources, like solar photovoltaic (PV). To solve the uncertainty of the PV power and reserve extra energy for frequency support, a battery energy storage system (BESS) is usually adopted. However, in the PV-battery GFM sy...Show More
Grid-forming (GFM) control becomes an emerging technology due to its advantages like frequency and inertial support, being a promising solution for the large-scale integration of renewable energy like solar photovoltaic (PV). In order to solve the fluctuation of the PV system (PVS) and reserve extra energy for frequency support, a battery energy storage system (BESS) is usually adopted. However, t...Show More
With the wide-scale adoption of renewable energy sources (RESs) in the grid, becoming inverter-based systems, the control of inverters is playing a key role in grid stability. Conventionally, the inverters are controlled in the grid-following (GFL) mode, and more recently in the grid-forming (GFM) mode. Aiming to universally facilitate the GFL and GFM mode of grid-connected inverters, this paper p...Show More
A three-phase PWM AC-DC converter with high power factor (PF) using hybrid-clamped five-level topology is researched in this paper. The mathematical model and control strategy are analyzed. In addition, a novel method to determine ac-side inductance according to required current ripple is proposed. Simulation and experimental results show the dc-link capacitor voltages imbalance extensively existi...Show More
A new full-bridge circuit which can achieve zero voltage switching (ZVS) for all the primary side switches over the full load range and a wide input voltage range is proposed. The ZVS is achieved by the energy stored in the auxiliary inductor and the magnetizing inductance of the transformer. Because the leakage inductance is relatively small, there is no severe duty ratio loss or severe voltage r...Show More