摘要:
When switching a current (Ic) by means of a semiconductor circuit breaker (44), provision can be made for a control voltage to be generated at the control input (50) of the semiconductor circuit breaker (44) by an actuation circuit (42) at switching flanks of a switching signal, said control voltage having a profile which is flattened in relation to the profile of the switching signal. One disadvantage of a solution of this kind is that the switching losses in the power semiconductor (44) are very high for the period during which the control voltage is reduced only slowly with a flattened profile. The object of the present invention is to reduce the switching losses in a semiconductor circuit breaker (44). In the case of the circuit arrangement according to the invention, a value can be predefined for a switching parameter of a control device (56) of the actuation circuit (42), it being possible for a switching behaviour of the actuation circuit (42) to be influenced by said switching parameter. In this case, a specific parameter value of the switching parameter can be varied during operation of the actuation circuit (42).
摘要:
The invention relates to a wind power plant (4) which consists of a nacelle (12) arranged on a tower (14), a rotor (28), a generator (16), a power converter (20) on the generator side, a power converter (22) on the network side and a transformer (26), the two power converters (20, 22) being electrically connected to each other on the DC voltage side, and the power converter (22) on the network side being connected on the AC voltage side to a feeding point (8) of a destination network (6) by means of the transformer (26). Every phase module (74) of the power converter (22) on the network side has an upper and lower valve branch (T1, T3, T5; T2, T4, T6) having at least two bipolar subsystems (76) that are connected in series and the power converter (20) on the generator side and the power converter (22) on the network side are interconnected on the DC side by means of a DC cable (72); A corresponding wind farm (2) consists of a plurality of wind power stations (4) and has a flexible design as compared to known DC concepts, the nacelles (12) of every wind power station (4) having a low dead weight.
摘要:
The invention relates to a power supply device for a speed-variable drive arranged at the bottom of the ocean, comprising a power converter (10, 12) each on the mains side and the consumer side, which are connected to each other in an electrically conductive manner on the DC side by means of a direct current cable (44), the power converter (10) on the mains side on land being connected to a supplying supply network (8). According to the invention, on the mains side an uncontrolled power converter (10) and on the consumer side a power converter (42) having distributed energy accumulators are provided, each phase module (52) of the power converter (42) having distributed energy accumulators comprises an upper and a lower valve branch (Tl, T3, T5; T2, T4, T6) having at least two series-connected two-pole sub-systems (54), the consumer-side power converter (42) having distributed energy accumulators is arranged at the bottom of the ocean, and a signal electronics unit (16) of the consumer-side power converter (42) having distributed energy accumulators is arranged on land. In this way, a power supply device for speed-variable drives for subsea applications is obtained, wherein the distance between the power supply on land and the drive at the bottom of the ocean can amount to several hundred kilometers, with ocean depths of several kilometers.
摘要:
The invention relates to a wind power plant (4) which consists of a nacelle (12) arranged on a tower (14), a rotor (28), a generator (16), a power converter (20) on the generator side, a power converter (22) on the network side and a transformer (26), the two power converters (20, 22) being electrically connected to each other on the DC voltage side, and the power converter (22) on the network side being connected on the AC voltage side to a feeding point (8) of a destination network (6) by means of the transformer (26). Every phase module (74) of the power converter (22) on the network side has an upper and lower valve branch (T1, T3, T5; T2, T4, T6) having at least two bipolar subsystems (76) that are connected in series and the power converter (20) on the generator side and the power converter (22) on the network side are interconnected on the DC side by means of a DC cable (72); A corresponding wind farm (2) consists of a plurality of wind power stations (4) and has a flexible design as compared to known DC concepts, the nacelles (12) of every wind power station (4) having a low dead weight.
摘要:
The invention relates to a pulse resistor for a frequency converter in the higher voltage and capacity range. The inventive pulse resistor is characterized by comprising at least two bipolar subsystems (24) and a resistor element (14), said subsystems (24) and said resistor element (14) being connected in series. The inventive pulse resistor is devoid of the drawbacks of known pulse resistors, it can be finely controlled by a brake current (iB) and can be adapted to any medium voltage by simple means.
摘要:
The invention relates to a controllable, non-locking semiconductor switching element (1) which comprises two switching terminals (2, 3) between which a connecting line (1') is positioned, as well as a control terminal (4). The connecting line (1') can be controlled via the control terminal (4) to have a low or high resistance. According to the invention a rise in a switching element voltage (US) which drops at the level of the switching terminals (2, 3) is detected. The connecting line (1') is controlled such that it presents a high resistance if the rise exceeds a threshold value.