JPS61102126A - Shaft driving generation set - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a shaft-driven power generator that is driven by a main engine whose rotational speed varies and outputs alternating current power of constant voltage and constant frequency.

[Technical background of the invention and its problems] In general, this type of shaft-driven power generator is
As shown in No. 22262, an alternating current generator driven by a main engine whose rotational speed fluctuates, a converter that converts alternating current power of varying frequency output from this alternator into direct current, and this converter. An inverter that converts the converted DC into constant frequency AC power, and a synchronous phase modifier that maintains the voltage of the constant frequency AC power converted by the inverter at a constant voltage and supplies reactive power to the inverter and load. It consists of

Such shaft-driven power generators can generate electricity using the surplus output of the main engine, which uses cheaper fuel than ordinary rotary engines, and have recently been attracting attention from an energy-saving perspective. By the way, this shaft-driven power generator uses a synchronous phase modifier and a separately excited inverter as an inverter. This is because the separately excited inverter can be easily commutated with the reactive power supplied from the synchronous phase gutter, and the control of the inverter can be simplified. However, since the separately excited inverter requires a large amount of reactive power, the capacity of the synchronous phase modifier must be increased, making the entire shaft-driven power generator expensive.

Therefore, although inverter control has become somewhat complicated in recent years, attempts have been made to use self-excited inverters that do not require reactive power as an inverter and therefore do not require a synchronous phase modifier. However, there is one problem here. That is, when a short circuit occurs in a load to which AC power is supplied, it is necessary to flow a short circuit sustaining current in order to disconnect the load from the grid. However, shaft-driven power generators using self-excited inverters do not require a synchronous phase modifier, so if a short circuit occurs in the load, the capacity of the elements that make up the inverter is sufficient to maintain the short circuit sustaining current. The need for extra margin makes the equipment excessively expensive. Furthermore, if the short-circuit current control function is activated, a disadvantage arises in that the load cannot be disconnected from the grid.

[Objective of the Invention 1] An object of the present invention is to provide a shaft-driven power generation device that can maintain short-circuit sustained current, utilize energy effectively, and does not require a special synchronous phase modifier for supplying reactive power. It is in.

[Summary of the Invention] The shaft-driven power generating device according to the present invention drives an alternating current generator by a main link that changes rotation, converts alternating current power with a variable frequency output from the alternating current generator into direct current using a converter,
Convert this DC to constant voltage, constant frequency AC power using a self-excited inverter +9! -J, the turbine generator is driven by the exhaust gas energy of the main engine, and the output of the turbine generator and the output of the self-help inverter are electrically connected.

[Embodiments of the invention] Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

1 is a main engine that drives a propulsion propeller 2 and changes its rotation; 3
is an AC generator driven by the main engine, 3a is its field winding, 4 is an AC lightning generator (a converter that converts the variable frequency AC power output from 3 into DC, and 5 is a converter 4). This is a self-excited inverter that converts the DC converted into constant voltage, constant frequency AC power, and the tFf is made up of elements such as SCR and GTO. 6 is a filter circuit, and 7 is the output voltage of the self-excited inverter 5. , a control device that detects current and controls the automatic inverter 5 and the alternator 3.

8 is an exhaust gas economizer that converts the exhaust gas energy of the main engine 1 into steam, 9 is a turbine driven by the steam converted by the exhaust gas economizer 8, 1° is a generator driven by the turbine 9, and 10a is its field winding. Line 11 is an automatic voltage regulator, which connects the exhaust gas economizer 8, turbine 9,
The generator 1o and the automatic voltage regulator 11 constitute a turbine generator 14. The output of the turbine generator 14, that is, the output of the generator 10, is electrically connected to the output of the self-help inverter 5 via the breaker 12.

13 is a breaker that supplies the output of the electrically connected self-excited inverter 5 and the output of the turbine generator to a load.

Next, the operation of the shaft-driven power generator configured as described above will be explained. First, alternating current power with a variable frequency outputted from the alternator 3 is converted into direct current independent of frequency in the converter 4, and then converted into alternating current power with constant voltage and constant frequency in the self-commutated inverter 5.

Here, since the self-excited inverter 5 does not require the supply of reactive power, a special synchronous phase modulator is not required.

On the other hand, the exhaust gas energy of the main engine 1 is converted into alternating current power by a turbine generator 14 consisting of an exhaust gas economizer 8, a turbine 9, a power generator 10, and an automatic voltage regulator 11. Here, the output of the turbine generator 14 and the output of the self-excited inverter 5 are electrically connected via the breaker 12, so the output power of the automatic inverter 5 is connected to the load via the breaker 13. Not only that, the output of the turbine generator 14 can also be supplied, allowing for effective use of energy. Also, since the load is electrically connected to the turbine generator,
Even if a short circuit occurs in the load, a short-circuit sustained current can flow,
The short-circuited load can be removed from the grid. Therefore, the output current setting of the self-excited inverter 5 can be selected near the rated value as shown in FIG.

[Effects of the Invention] As described above, according to the present invention, direct current converted by a converter is configured to be converted into constant voltage, constant frequency alternating current power by a self-commutated inverter that does not require the supply of reactive power, and the main Since the turbine generator is driven by the exhaust energy of the engine, and the output of the turbine generator is electrically connected to the output of the self-excited inverter, there is no need to provide a special synchronous phase changer, and the load is connected to the turbine generator. A short-circuit sustaining current can flow from the machine, and even if a short circuit occurs in the load, it can be disconnected from the grid. Furthermore, since the exhaust gas energy of the main engine drives the turbine generator and supplies power to the load, there is an effect that energy can be used effectively.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram showing an embodiment of the shaft drive power generator according to the present invention, and FIG. 2 is a characteristic diagram of an automatic inverter used in the present invention. 1... Main engine 3... AC generator 4... Converter 5... Self-excited inverter 7... Control device 8... Exhaust gas economizer 9... Turbine 10... Generator 12 ... Breaker 14 ... Turbine generator (8733) Agent Patent attorney Akira Inomata (and 1 others)
given name)

Claims (1)

[Claims] An alternator that is driven by a main engine whose rotational speed varies, a converter that converts alternating current power of variable frequency output from this alternator into direct current, and a constant voltage, constant frequency converter that converts the alternating current that is converted by this converter into direct current. A shaft-driven power generation device comprising a self-excited inverter that converts the self-excited inverter into alternating current power, and a turbine generator that is driven by the exhaust gas energy of the main engine and electrically connected to the output of the self-excited inverter.