Unfolder two apps5/26/2023 ![]() Besides that, the DC-link capacitors along with the L filter (to grid interface) have a large size and weight. However, a well-known drawback is that the multi-stage conversion decreases the converter efficiency. The DC-link voltage and capacitance are chosen in such a way that the VSI controls the active and reactive power transfer with the grid, whereas the DAB DC–DC allows galvanic isolation and only controls the active power transfer. In the typical two-stage converter, a voltage source inverter (VSI) is DC-linked by electrolytic capacitors with a dual-active bridge (DAB) DC–DC converter. For these applications, the typical structures are two or three stage AC–DC converters. Galvanic isolation is required between the bidirectional DC source and the grid to ensure safety and low leakage currents. Moreover, higher efficiency (96%) and smaller grid currents THDi (3%) were obtained.īidirectional and isolated AC–DC converters with active and reactive power capability play an essential role in electric vehicles’ smart battery chargers (SBC), and future solid-state transformers (SST) to improve grid reliability, particularly for grid voltage regulation. Compared with other structures, tiny DC-link capacitors and smaller L filters were used. Active and reactive power control were validated in a 2 kW prototype. Hence, the FDR angle was used to compensate for this increase. It is shown that the HF current amplitude is increased for reactive power injection. A constant HF current amplitude with minimum value was obtained. In contrast, the DC source was modulated by a fixed DR (FDR) angle along with a phase-shift angle which changes according to the grid current amplitude. The rectified grid voltages were modulated by time-variant duty ratio (DR) angles. A novel QAB modulation is proposed to solve three issues: (1) Three DC inputs with high ripple compensation, (2) active–reactive power injection, and (3) minimization of high-frequency (HF) transformers currents. This article introduces an SSIB three-phase AC–DC converter composed of three low frequency rectifiers linked by tiny film capacitors with a quad-active-bridge series-resonant (QABSR) DC–DC. However, there is a research gap for SSIB reactive power injection. *Two accounts are online at the same time, easily switch between two accounts, and each account information is managed independently.Single-stage isolated and bidirectional (SSIB) AC–DC converters have a high potential for future solid-state transformers and smart battery chargers due to their reduced volume and high efficiency. ![]() ![]() The receiving of different account information and the data in the account do not interfere with each other. *Social, games and other applications can log in to the second account in the dual app. * Make your personal account and work account both online, and you can balance between life and work easily. Keep multiple social accounts logged in simultaneously It can make your private account hidden and can not be seen by others, so your data security is ensured and your privacy is protected. * Dual App provides privacy, leaving no trace in the phone system. *Cloning the application, Dual App do not install more applications in your device, so that keeping your device running smoothly. Clone and run multiple accounts of the same app simultaneously(Social and gaming apps)!
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