Method for producing reactive current with a converter and converter arrangement and energy supply plant

• US 20140103886A1
• Filed: 07/31/2013
• Published: 04/17/2014
• Est. Priority Date: 02/02/2011
• Status: Abandoned Application

• Current Assignee: Universitaet Kassel
• Original Assignee: Universitaet Kassel
• Inventors: Heier, Sigfried, Da Costa, Jean Patric, Dziendziol, Christoph
• Application Number:
  US13/955,294
• Publication Number:
  US 20140103886A1
• Time in Patent Office: Days
• US Class Current: 323/207
• CPC Class Codes: H02J 2300/28 The renewable source being wind energy
• CPC Class Codes: H02J 3/16 by adjustment of reactive power
• CPC Class Codes: H02J 3/381 Dispersed generators
• CPC Class Codes: H02M 1/4208 Arrangements for improving power factor of AC input
• CPC Class Codes: Y02E 10/76 Power conversion electric or electronic aspects
• CPC Class Codes: Y02E 40/30 Reactive power compensation

Abstract

in a method for producing reactive current with a converter (4), a generator-side converter unit (41) and a system-side converter unit (43) are connected to one another via a DC voltage intermediate circuit (42). In a normal operating state, the converter (4) serves to convert and feed an electrical power produced by a generator (2, 2′) into an energy supply system (7), and in a faulty operating state serves to provide electrical reactive current to the energy supply system (7). The generator-side converter unit (41) is isolated from the generator (2, 2′) and the generator-side converter unit (41) is connected to the energy supply system (7). A reactive current is provided to the energy supply system (7) by means of the system-side converter unit (41) and the generator-side converter unit (43).

Claims

1. A method for producing reactive current during a fault of an energy supply system with a converter (4), which has a generator-side converter unit (41) and a system-side converter unit (43), which are connected to one another via a DC voltage intermediate circuit (42), wherein the converter (4)

in a normal operating state serves to convert and feed an electrical power produced by a generator (2, 2′

) into an energy supply system (7), and

in a faulty operating state serves to provide electrical reactive current to the energy supply system (7),

having the following steps;

isolating the generator-side converter unit (41) from the generator (2, 2′

),

connecting the generator-side converter unit (41) to the energy supply system (7), and

providing reactive current to the energy supply system (7) by means of the system-side converter unit (41) and the generator-side converter unit (43).

2. The method as claimed in claim 1, wherein a switchover time for providing the reactive current is short enough for enabling a fault ride through (FRT) of the power supply system fault.

3. The method as claimed in claim 1, wherein the system-side converter unit (41) and the generator-side converter unit (43) have power semiconductor switches, and wherein, in the faulty operating state, the provision of reactive current is performed by suitable actuation of the power semiconductor switches of the system-side converter unit (41) and the generator-side converter unit (43).

4. The method as claimed in claim 1, wherein the system-side converter unit (41) is connected to the energy-supply system (7) via a filter (5), and wherein the generator-side converter unit (41) is connected to the energy supply system (7) in the faulty operating state via a further filter (8).

5. A converter arrangement for feeding an electrical power provided by a generator (2, 2′

) into an energy supply system (7) during a during a fault of an energy supply system comprising a converter (4), which has a generator-side converter unit (41) and a system-side converter unit (43), which are connected to one another via a DC voltage intermediate circuit (42), characterized in that a changeover switch (3) is provided, via which the generator-side converter unit (41) can be connected either to the generator (2, 2′

) or to the energy supply system (7).

6. The converter arrangement as claimed in claim 5, characterized in that the converter (4) has a control device (44), which is connected to the changeover switch (4) for actuation thereof, and which is designed to implement a method.

7. The converter arrangement as claimed in claim 6, characterized in that the system-side converter unit (41) and the generator-side converter unit (43) of the converter (4) have power semiconductor switches, which are actuated via the control device (44).

8. The converter arrangement as claimed in claim 5, characterized in that the system-side converter unit (41) is connected to the energy supply system (7) via a filter (5), and in that a further filter (8) is provided, via which the generator-side converter unit (41) is connected to the energy supply system (7) in the faulty operating state.

9. An energy supply plant, having a converter arrangement as claimed in claim 5.

10. The energy supply plant as claimed in claim 9, which is a wind power plant.

11. The energy supply plant as claimed in claim 9, in which the generator (2) is a synchronous generator or an asynchronous generator with a squirrel-cage rotor.

12. The energy supply plant as claimed in claim 9, in which the generator (2) is a double-fed asynchronous generator and the converter (4) is arranged in a rotor circuit.

13. The energy supply plant as claimed in claim 9 which is a solar energy plant.