Abstract:
The present disclosure generally relates to AC power control. More particularly, the present disclosure relates to a system and method for a Grid Tie Inverter (GTI) that provide for improved synchronization with the grid and better anti-islanding protection. In an aspect, the present disclosure provides for a system and method for improved synchronization of a GTI using a modulation method to turn OFF all switches near zero crossing that simplifies grid presence, voltage, frequency, phase detection and estimation, and also improves Phase Locked Loop (PLL) to synchronize the generated voltage with the grid. The system and method of the present disclosure also provides for a modulation method of using 3 switches out of 4 to avoid any reverse current from the grid to the GTI.
Abstract:
A three-phase power converter for converting power between a power grid network and a battery (255) comprises a three-phase grid transformer (230), a three-phase switching converter (251) for coupling to a positive terminal of the battery, a first, second and third series inductors(Ls1, Ls2, Ls3) coupled between the three-phase grid transformer and the three-phase switching converter, a control circuit (262) configured for controlling a first, second and third phase differences between first, second and third time-periodical power grid voltage signals(Vs1, Vs, Vs3) provided by the grid transformer and first, second and third converter time-periodical voltage signals (Vc1, Vc2, Vc3)provided to the switching converter such that the first, second and third time- periodical power grid voltage signals(Vs1, Vs2, Vs3) and first, second and third converter time-periodical currents(Ic1, Ic2, Ic3) are in phase. The three-phase grid transformer provides electrical isolation between the power grid network and the battery.
Abstract:
A system or method for a VSD with an active converter including a controller, an inductor, an active converter, a DC link, and an inverter. The active converter is controlled to receive an input AC voltage and output a boosted DC voltage to a DC link, up to 850 VDC, the active converter using only low voltage semiconductor switches to provide the 850 VDC DC link voltage. The controller is configured to operate with a reactive input current magnitude equal to zero at a predetermined system load, and at system loads less than the predetermined system load, to introduce a reactive input current that results in a converter voltage having a magnitude less than the input voltage, wherein the vector sum of the input voltage and an inductor voltage is equal to the converter voltage.
Abstract:
Convertisseur alternatif-continu destiné à être relié, côté alternatif, à un générateur synchrone à aimants permanents (1) et, à délivrer une tension continue(V), comportant: un pont redresseur (22, 32) avec plusieurs cellules (22.1, 32.1) à deux bras (E1, E2) ayant deux bornes extrêmes (B, C) et une borne milieu (A) à connecter au générateur; une paire (23) de dispositifs de stockage d'énergie (C', C'') en série, montés aux bornes extrêmes (B, C), côté continu,possédant un nœud commun (N1); autant de dispositifs interrupteurs bidirectionnels (4) que de cellules(22.1, 32.1), chacun monté entre une cellule (22.1, 32.1) et le nœud commun(N1); des moyens de commande vectorielle (5) des dispositifs interrupteurs,devant recevoir la vitesse (q) du rotor, le courant (ia, ib, ic) à injecter dans le convertisseur et la tension continue (V), destinés à activer chaque dispositif interrupteur (4),de manière à ce que le courant (ia, ib, ic) et la tension appliquée(ua, ub, uc) au convertisseur soient en phase.
Abstract:
A power factor correction (PFC) boost circuit. The PFC boost circuit can include a first switching device, a second switching device, a first gate driver coupled to the first switching device, a second gate driver coupled to the second switching device, and a PFC controller configured to control the first and second gate drivers. The PFC controller will utilize a new technique, referred to herein as "predictive diode emulation" to control the switching devices in a desired manner and to overcome inefficiencies and other problems that might arise using traditional diode emulation. The PFC controller is configured to operate in synchronous and non-synchronous modes.
Abstract:
Disclosed is an anti-surge bridgeless power factor correction (PFC) circuit, which comprises a bridgeless PFC circuit and a boost capacitor which are connected between an AC power supply and a load in sequence. The anti-surge bridgeless PFC circuit also comprises a protection unit, a switch unit and a control unit. When a surge merges into the input of the AC power supply, the control unit controls the switch unit to be conducted, so as to form return current and discharge surge energy through the protection unit, the boost capacitor and the switch unit, thereby being able to protect a bridgeless PFC circuit from the influence of the surge.
Abstract:
Procédé de commande de charge d'une batterie ( 1 3 ), notamment d'une batterie d'un véhicule automobile, à partir d 'un réseau monophasé, dans lequel : - on filtre la tension d' entrée (Ve); - on amène la puissance électrique du réseau à la batterie via un étage abaisseur de tension (3) et un étage élévateur de tension (4) couplés ensemble via un composant inductif (Ld); et - on contrôle une intensité (Id) traversant ledit composant inductif en fonction d'une consigne d ' intensité (Idref), ladite intensité (Id) n' étant pas continûment commandable, Selon ce procédé, on élabore la consigne d ' intensité de manière que ladite consigne d' intensité ait au moins une première valeur et au moins une deuxième valeur supérieure à la première valeur, la consigne d' intensité ayant la deuxième valeur avant le début d'une phase au cours de laquelle l 'intensité n' est pas commandable.
Abstract:
A power converter and a method of operation thereof is disclosed including an input, an output, a sensor unit, a switched power converter, and a processor module. The power converter may convert an input power into an output power. The power converter may sense real-time measurements of the input power and the output power to determine a real-time calculated efficiency. The power converter may chop the input power into sized and positioned portions of the input power based on a plurality of determined operating parameters. The power converter may determine the operating parameters based on the real-time calculated efficiency and on a plurality of other operating factors/conditions.