GE Energy Power Conversion Technology

The invention relates to a power device (1) comprising a first modular multilevel power converter (2), a second modular multilevel power converter (3), a DC link (4) connecting the first modular multilevel power converter (2) and the second modular multilevel power converter (3), a storage module (5) connected to the second modular multilevel power converter (3), and a control circuit (6). The first modular multilevel power converter (2) is intended to be connected to a main grid G_M powering an AC current and the second modular multilevel power converter (3) is intended to be connected to an auxiliary grid G_A. The control circuit (6) is configured to control the first modular multilevel power converter (2), the second modular multilevel power converter (3) and the storage module (5) to stabilize the current and the voltage delivered by the main grid G_M to reduce reactions in the main grid G_M and in the auxiliary grid G_A. The control circuit (6) is further configured to control the second modular multilevel power converter (3) and the storage module (5) to power the auxiliary grid G_A.

A power device (5) main input terminals (6) configured to be connected to a grid (G), an AC/AC power converter (7) operatively coupled to the main input terminals (6) and to an AC main bus (10) powered by the AC/AC power converter (7). The power device also comprises a plurality of power branches (11, 12, 13). Each power branch (11, 12, 13) comprises input terminals (14, 15, 16) connected to the AC main bus (10), and at least one set of output terminals (17, 18, 19) configured to be connected to a load (2, 3, 4). At least one power branch (11, 12, 13) comprises at least one dimmer (22, 23) characterized in that each dimmer (22, 23) comprises two thyristors (35, 36), and a control circuit (41) configured to control the two thyristors (35, 36) to trigger into conduction or to block either one of the first thyristor (35) or the second thyristor (36) or both, so that the AC main bus (10) powers or not the said load (2, 3, 4).

Power supply system comprising main input terminals configured to be connected to a grid, an AC/AC power converter comprising input terminals connected to the main input terminals and output terminals, and a plurality of power branches. Each power branch comprising input terminals connected to the output terminals of the AC/AC power converter, at least one set of output terminals configured to be connected to a DC load of the plurality of DC loads, a branch transformer connected to the input terminals of the said power branch; and a controlled rectifier connected to the branch transformer, the controlled rectifier comprising output terminals connected to the output terminals of the said power branch to power the output terminals of the said power branch with a DC current.

Auxiliary power supply, connected by its inputs to a power supply and by its outputs to a load, comprising at least two modules (Mi,Mj), the modules inputs being connected in serial, the modules outputs being connected in parallel, wherein in each module:a. The first input pole (Ii1,Ij1) is connected to a first pole of a first capacitor (Ci1,Cj1) and to a first pole of a first switch (Si1,Sj1),b. The second input pole (Ii2,Ij2) is connected to the second pole of the first capacitor (Ci1,Cj1), to a second pole of a second switch (Si2,Sj2) and to a pole of a second capacitor (Ci2,Cj2),c. a second pole of the first switch (Si1,Sj 1) is connected to a first pole of the second switch (Si2,Sj2) and to a pole of an inductor (Li,Lj ),d. the inductor (Li,Lj) is connected by its other pole to a first end of a primary winding of a transformer (Ti,Tj),e. the second end of the transformer (Ti,Tj) primary winding is connected to a first pole of the second capacitor (Ci2,Cj2),the transformer (Ti,Tj) secondary winding is connected to the output poles (Oi1,Oi2,Oj1,Oj2)

A switching module (1) is described. The switching module (1) comprises an H-bridge circuit (2) with four switching assemblies, and an active clamp circuit (6) with four controllable semiconductor switches (S5, S6, ..., S8). Each switching assembly comprises a pair of controllable semiconductor switches electrically connected an anti-series (S1, S2, ..., S4 and S9, S10, ..., S12). Alternatively, each switching assembly may comprise a controllable semiconductor switch and a diode electrically connected in series. The H-bridge circuit (2) comprises first and second AC bridge terminals (AC1, AC2) electrically connectable to a respective coil (4), and first and second DC bridge terminals (DC1, DC2) electrically connectable to a DC current source or to a DC bridge terminal of another switching module. The active clamp circuit (6) comprises first and second DC clamp terminals (DC3, DC4) between which an energy storage device (C) is electrically connected. A plurality of switching modules may be electrically connected together to provide a power electronic switching assembly.

A power system (1) is described. The power system (1) includes an AC/DC power converter (6) electrically connectable to an AC power network (2) and a DC link (8). An electrical load (10) is electrically connected to the DC link (8). A DC/DC power converter (14) is electrically connected to the DC link (8) and an energy storage device (12). A first converter controller (16) is adapted to control the DC/DC power converter (14) to regulate the DC link voltage, and the flow of power between the energy storage device (12) and the DC link (8). The second converter controller (18) is adapted to control the AC/DC power converter (6) and to regulate or control at least one of the voltage at the AC terminals of the AC/DC power converter (6), inertial AC power, and synchronisation with the AC power network (2).

A stator assembly (1) of an axial flux electrical machine is described. The stator assembly (1) includes a plurality of stator coils (4) and a plurality of core segments (2) arranged circumferentially to define a segmented stator core (3). Each core segment (2) includes a tooth part (2a) that extends axially and which is adapted to mount a respective stator coil (4). The stator core (3) can also be non-segmented with a plurality of tooth parts arranged circumferentially. Adjacent mounted stator coils (4) are spaced apart by a substantially trapezoidal void. The stator assembly (1) also includes a plurality of stator coil retainers (10). Each retainer (10) is received in a respective void between a pair of adjacent mounted stator coils (4) and its position in the radial direction is independently adjustable. Each retainer (10) includes at least one channel for receiving a cooling fluid (e.g., cooling air or a suitable cooling liquid such as water or propylene glycol). Each retainer (10) also includes a pair of contact surfaces that are spaced apart in the circumferential direction. Each retainer (10) is adapted to apply a contact pressure to the respective pair of adjacent mounted stator coils (4) through the contact surfaces.

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Zusammenfassung wird geladen …

Zusammenfassung wird geladen …