CN100416969C - Power supply systems for island networks - Google Patents

Abstract

The present invention relates to a power supply system for an island network, in particular on an oil rig or a ship. Wherein, the power supply system includes at least one generator (3) and at least two three-phase current systems (1a, 1b), and the generator (3) has at least two three-phase coil systems, so it may not use or maximize Earth does not use a current converter transformer to supply two phase-shifted three-phase current systems (1a, 1b), where the coil system of the generator (3) is spatially aligned with the electrical phases of the three-phase current system (1a, 1b) Set accordingly. The two three-phase current systems (1a, 1b) together form the primary system (1) and supply the secondary three-phase current system (2) by means of a transformer arrangement (4). The solution according to the invention provides precisely the weight and space savings which are so important for island systems.

Description

Power supply systems for island networks

technical field

The invention relates to a power supply system for an island network, wherein the power supply system has at least one generator and at least two three-phase current systems.

Background technique

A power supply system for an island network is understood to mean the overall energy system, ie the energy system in which electrical energy is generated, transmitted and ultimately converted into other forms of energy. The system is space-constrained in terms of its size and cannot be compared with power supply systems on land. Such systems are used in particular on marine-related and/or mobile installations. For example on ships and other marine vehicles, drilling platforms or other isolated, especially marine-related technical installations with energy requirements.

Depending on the implementation of the power supply system, there are usually at least two electrically phase-shifted three-phase current systems, which are driven by means of parallel-connected converters to pass through the electrical energy. Current and voltage harmonics are induced by the phase shift of a three-phase current system. The phase shift of such a three-phase current system is currently produced by means of a current converter transformer, wherein the phase shift of the three-phase current system is achieved by a corresponding selection of circuit groups.

In the above-mentioned power supply systems for island networks, especially at sea, the high weight of the system components employed poses gravity problems. Therefore, there are currently different solutions trying to optimize the weight of the devices belonging to the system, such as the current converter transformers and converters.

Contents of the invention

The technical problem to be solved by the present invention is to provide a power supply system for an island network, which has at least one generator and at least two three-phase current systems, which in particular further improves the above-mentioned problems.

According to the invention, the aforementioned technical problem is solved in that the generator of the power supply system has two three-phase coil systems respectively assigned to the three-phase current system, wherein a voltage is induced in the coil systems and the generator The coil system is spatially arranged in such a way that the voltages of the two three-phase current systems are electrically phase-shifted relative to each other. The power supply system has a primary system and a secondary three-phase current system, wherein the primary system is formed from the two three-phase current systems, the primary system is coupled to the secondary three-phase current system, and in the A load is coupled to the primary system described above.

According to the invention, it is thus possible to dispense completely or at least to a minimum with a current converter transformer for generating the two three-phase power systems, thereby having significant advantages in terms of weight and cost, as well as saving space.

Preferably, the electrical phase shift between the three-phase current systems in the primary system is 30°. This phase shift is particularly beneficial for reducing current and voltage harmonics in a further three-phase current system which is supplied by means of parallel-connected converters and which may be connected downstream.

Preferably, the coil system of the generator is installed in the trench in such a way that short-circuit currents occur to a minimum. In this way, the undesired energy input in the motor via the stator-side magnetic coupling of the coil system can be significantly reduced.

It is expedient to connect a load to the three-phase current system in both said primary systems. This approach is precisely for systems with more than two or multiples of two three-phase currents to prevent loss of redundancy in the system.

Advantageously, the power supply system has a primary system and a secondary three-phase current system, wherein the primary system is formed from two three-phase current systems, the primary system being coupled to the secondary three-phase current system. In this way, different devices in different voltage ranges can be applied to the circuit and/or the converter in the primary and secondary system. In this case, the determination of the voltage range is preferably determined in each case by the load to be supplied with energy. This results in an overall cost advantage since, if necessary, more cost-effective arrangements can be used for the low-pressure range.

Preferably, the secondary three-phase current system is coupled to another generator. This makes it possible to also supply loads on the primary system or the secondary system if a fault occurs in the other system while the energy is being generated.

Preferably, the coupling between the primary system and the secondary three-phase power system is effected in such a way that energy generated by means of a generator coupled to the secondary three-phase power system can be fed to the primary system. In this way, a generator connected to the secondary system can also supply loads connected to the primary system in an emergency.

Description of drawings

Embodiments and other advantages of the present invention will be further described below in conjunction with the accompanying drawings. in,

Figure 1 shows a schematic diagram of an example of a power supply system for an island network according to the present invention;

Figure 2 shows a schematic diagram of an example of a power supply system with a load on the primary system according to the invention;

Figure 3 shows an example of a transformer arrangement for coupling a primary system and a secondary system;

Figure 4 shows an example of a transformer arrangement for coupling a primary system and a secondary system.

Detailed ways

Fig. 1 shows a schematic diagram of a power supply system for an island network according to the present invention by way of example. Therein, a generator 3 connected to the two three-phase current systems 1a, 1b generates energy, for example by burning diesel fuel. In this case, the generator 3 has two three-phase coil systems, which are respectively assigned to the three-phase current systems 1a, 1b, wherein a voltage is induced in the coil systems and the coil systems are spatially arranged in the generator 3 in such a way that The voltages of the two three-phase current systems 1a, 1b are electrically phase-shifted relative to each other. As a result, a current converter transformer for generating the two three-phase power systems can be completely or at least largely dispensed with.

The two three-phase current systems 1a, 1b together form the primary system 1 . Preferably, the two three-phase current systems 1 a , 1 b are electrically phase-shifted by 30° and the secondary three-phase current system 2 is powered by means of at least one transformer device 4 . As a result, current and voltage harmonics are induced in the secondary three-phase current system 2 . In the embodiment shown in FIG. 1, the transformer arrangement 4 comprises two transformers connected in parallel.

Loads (not shown), such as motors or other drives, are connected to both primary system 1 and secondary system 2 . The generator 7 connected to the secondary system 2 can be used as a backup generator, and ensures the power supply of the secondary system 2 and the primary system 1 when the main generator 3 is not working.

FIG. 2 shows a schematic diagram of another example of a power supply system according to the invention, in which loads 6 a , 6 b are coupled to the primary system 1 . The generator 3 is connected to two three-phase current systems 1a, 1b, which are preferably electrically phase shifted by 30° relative to each other. The two three-phase current systems 1a, 1b form the primary system 1 . The motors 6a, 6b are powered via two converters 5a, 5b.

Primary system 1 is coupled to secondary three-phase current system 2 by means of two transformer arrangements 4 . Further loads not shown in the figure can be connected to the primary system 1 in addition to the motors 6a, 6b. Further loads not shown in detail and at least one generator are connected to secondary three-phase electrical system 2 via connections 8 a , 8 b , 8 c .

According to the embodiment shown in Fig. 2, the structure of the generator 3 guarantees that, firstly, the load suitable for the oil production rig, such as the motor 6a, 6b, can be evenly distributed on the stator-rotor side connected with the three-phase current system 1a, 1b load. In this case, operation at the highest voltage level is possible in the primary system 1 .

The secondary three-phase current system 2 is coupled to the primary system 1 via a transformer arrangement 4 in a symmetrical manner. In this case, the two transformer arrangements 4 have, for example, a delta connection on the primary side and a delta connection and a star connection on the secondary side.

3 and 4 show further configurations of the transformer arrangement 4 for coupling the primary system 1 and the secondary system 2 . In this case, the individual coil systems of the transformer arrangement 4 assign the two primary three-phase current systems 1 a , 1 b to the secondary three-phase current system 2 with connections 8 a , 8 b , 8 c . The transformer arrangement 4 shown in FIGS. 3 and 4 can be realized as an integrated transformer arrangement, ie it has only one coil system per connection 8 a , 8 b , 8 c on the secondary side as schematically shown in the figures.

In the transformer arrangement 4 shown in FIG. 3 , the coil system is star-connected on the side of the secondary three-phase current system 2 .

In the transformer arrangement 4 shown in FIG. 4 , the coil system is delta-connected on the side of the secondary three-phase current system 2 .

Figures 1 and 2 show a basic power supply system for an island network according to the invention. At least two such power supply systems can be coupled to one another. It is also possible to couple at least one power supply system according to the invention to an existing power supply system for an island network.

A power supply system consisting of a plurality of basic power supply systems as shown in FIGS. 1 and 2 can meet correspondingly high energy demands, and it can also be implemented in such a way that in addition to one main generator 3 other main generators 3 are also provided . The power supply system can also be designed in such a way that it has a plurality of primary systems 1 supplying one or more secondary systems 2 . The power supply system can be designed such that one primary system 1 supplies one or more secondary three-phase power systems 2 and/or one secondary three-phase power system 2 is supplied via one or more primary systems 1 .

The power supply system according to the invention is generally less expensive in terms of maintaining uniform loads, flexibility and capacity at least, and has a significantly lower weight than hitherto existing systems. The current converters required for the two phase-shifted three-phase power systems 1a, 1b require significantly less space than conventional systems.

Claims (6)

1. A power supply system for an island network with a generator (3) and two three-phase current systems (1a, 1b), characterized in that, The generator (3) has two three-phase coil systems respectively assigned to the three-phase current systems (1a, 1b), wherein a voltage is induced in the coil systems and the generator (3) The coil system is spatially arranged such that the voltages of the two three-phase current systems (1a, 1b) are electrically phase-shifted relative to each other; The power supply system has a primary system (1) and a secondary three-phase current system (2), wherein the primary system (1) is formed by the two three-phase current systems (1a, 1b), the primary system Coupled to the secondary three-phase current system (2), and a load (6a, 6b) is coupled to the primary system (1). 2. The power supply system according to claim 1, characterized in that the electrical phase shift between the three-phase current systems (1a, 1b) in the primary system (1) is 30°. 3. The power supply system according to claim 1 or 2, characterized in that, the coil system of the generator (3) is installed in the groove in such a way that the short-circuit current of the coil system is minimized. 4. The power supply system according to claim 1 or 2, characterized in that loads (6a, 6b) are connected to three-phase current systems (1a, 1b) in both said primary systems (1). 5. The power supply system according to claim 1, characterized in that the secondary three-phase current system (2) is coupled with another generator. 6. The power supply system according to claim 5, characterized in that the coupling between the primary system (1) and the secondary three-phase current system (2) is realized in such a way that the The energy generated by means of a generator coupled to the secondary three-phase electrical system (2) is supplied to the primary system (1).

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