KR102269005B1 - Generator system - Google Patents

Abstract

A generator system is disclosed. The system of the present invention is driven by the rotation of the engine, the generator for outputting N-phase (N is an odd number of 3 or more) power; a power converter for transferring the N-phase power output from the generator to a load; and a control unit for controlling the speed of the engine according to the size of the load, and controlling the operation of the power converter according to the size of the load, wherein the power converter is a rectifier for rectifying the N-phase AC power into DC power. ; and an inverter unit converting the DC power received from the rectifying unit into AC power having a predetermined frequency and applying the converted DC power to the load.

Description

GENERATOR SYSTEM

The present invention relates to a generator system.

Recently, as the demand for eco-friendliness and high efficiency increases, power converters are being applied to generators used in various fields such as electric vehicles and electric railways.

1 is a configuration diagram for explaining a conventional generator system.

As shown in the figure, in the conventional generator system, the output terminal of the generator 110 driven by the engine 100 is connected to the load 120, and at this time, the advance capacitor 130 for load adjustment is the generator 110 ) and the load 120 .

However, the system as shown in FIG. 1 has a problem in that the voltage fluctuation of the generator 110 is large according to the change of the load 120 , and the quick response of the generator 110 is slow, making it difficult to cope with the rapidly changing load 120 . . In addition, there is a problem in that it is difficult to maintain the advance capacitor 130 .

In order to solve this problem, in the system as shown in FIG. 1, a power converter consisting of a rectifier diode, a capacitor consisting of an electrolytic capacitor and a film capacitor, and a single-phase inverter is mounted at the output of the generator 110 to respond to generator load changes and rapid response to provide a stable power supply.

2 is a configuration diagram for explaining a conventional generator system equipped with a power converter.

The generator system of the configuration of Figure 2, the power converter 200 consisting of a rectifying diode 210, a capacitor 220, and a single-phase inverter 230 is connected to the output of the generator 110, the power converter 200 It has a structure in which the output of the generator 110 is transmitted to the load 120 through the.

Such a system is stable to a change in load and can supply power stably to the generator 110 quick response, but it is difficult to fix the circuit due to the three-phase generator 110, and the size of the power converter due to the electrolytic capacitor 220 Since , there is a problem in that the overall size of the system increases. In addition, there is a problem in that the life of the entire system is shortened due to the electrolytic capacitor 220 .

The technical problem to be solved by the present invention is to provide a generator system that uses a polyphase generator and simplifies the system by removing the electrolytic capacitor from the power converter.

In order to solve the above technical problem, the generator system of an embodiment of the present invention is driven by the rotation of the engine, the N-phase (N is an odd number of 3 or more) generator for outputting power; a power converter for transferring the N-phase power output from the generator to a load; and a control unit for controlling the speed of the engine according to the size of the load, and controlling the operation of the power converter according to the size of the load, wherein the power converter is a rectifier for rectifying the N-phase AC power into DC power. ; and an inverter unit converting the DC power received from the rectifying unit into AC power of a predetermined frequency and applying the converted DC power to the load.

In one embodiment of the present invention, the rectifying unit is composed of a rectifying circuit of a single module that converts N-phase power to DC power, and the inverter unit is a plurality of modules that output single-phase AC power or three-phase AC power. It may be composed of a plurality of output modules.

In one embodiment of the present invention, the rectifying unit is composed of a single-module power device that converts N-phase power to DC power, and the inverter unit outputs a plurality of modules that output single-phase AC power or three-phase AC power. It may be composed of a plurality of modules.

In one embodiment of the present invention, the rectifying unit is composed of a rectifying circuit of a plurality of modules for converting N-phase power to DC power, respectively, and the inverter unit is a single module or three-phase AC power source for outputting single-phase AC power. It can be composed of a single module that outputs

In an embodiment of the present invention, the rectifying unit is composed of a plurality of module power devices that convert N-phase power to DC power, respectively, and the inverter unit is a single module or three-phase AC power source for outputting single-phase AC power. It can be composed of a single module that outputs.

In addition, in order to solve the technical problem as described above, the generator system of an embodiment of the present invention is driven by the rotation of the engine, the generator for outputting N-phase (N is an odd number of 3 or more) power; a power converter for transferring the N-phase power output from the generator to a load; and a control unit for controlling the speed of the engine according to the size of the load, wherein the power converter rectifies the N-phase AC power into DC power, and comprises: a rectifying unit composed of a single module or a plurality of modules; and an inverter unit configured to convert DC power received from the rectifying unit into AC power of a predetermined frequency and apply it to the load, and comprising a plurality of modules or a single module, wherein the control unit determines the operation of the inverter unit and the size of the load It is possible to control the operation of the power converter according to the.

The present invention as described above has an effect of removing the electrolytic capacitor from the power converter by applying a multiphase generator.

In addition, the present invention has an effect of enabling a response to loads of various capacities by configuring a plurality of rectifying units or a plurality of inverters receiving power from a polyphase generator as a module.

1 is a configuration diagram for explaining a conventional generator system.
2 is a configuration diagram for explaining a conventional generator system equipped with a power converter.
Figure 3 is an exemplary view for explaining the generator system of an embodiment of the present invention.
Figures 4a and 4b is an exemplary view for explaining the configuration of the power converter of the first embodiment of the present invention.
Figures 5a and 5b is an exemplary view for explaining the configuration of the power converter of the second embodiment of the present invention.
6a and 6b is an exemplary view for explaining the configuration of the power converter of the third embodiment of the present invention.
7A and 7B are exemplary views for explaining the configuration of the power converter according to the fourth embodiment of the present invention.

Since the present invention can have various changes and can have various embodiments, specific embodiments are illustrated in the drawings and described in detail in the detailed description. However, this is not intended to limit the present invention to specific embodiments, and it should be understood to include all modifications, equivalents and substitutes included in the spirit and scope of the present invention.

Hereinafter, a preferred embodiment according to the present invention will be described in detail with reference to the accompanying drawings.

Figure 3 is an exemplary view for explaining the generator system of an embodiment of the present invention.

As shown in the drawings, the generator system of an embodiment of the present invention may include an engine 10 , a polyphase generator 20 , a power converter 30 and a control unit 50 , and a polyphase generator 20 . Power output from the may be provided to the load 40 through the power converter (30).

As shown in the figure, in the generator system of the present invention, the generator 20 generates power by the rotation of the engine 10, and in one embodiment of the present invention, the generator 20 of a polyphase (N-phase) may be used, and thus the power converter 30 may not use an electrolytic capacitor. Hereinafter, it is referred to as 'N-phase' as a polyphase, where N may represent a natural number of 3 or more.

The generator 20 of the present invention is an N-phase generator, therefore, since the power converter 30 configured per winding of the generator can be configured in parallel, it can be combined with the load 40 of various modules, so that the capacity variability this is excellent In addition, the ripple of the output power is reduced, it is possible to remove the electrolytic capacitor of the power converter (30).

In addition, the power converter 30 of the present invention may include a rectifying unit 31 and an inverter unit 32 .

At this time, the rectifier 31 may receive an N-phase alternating current (AC) power and rectify it as a DC power, and depending on the configuration of the device, a full-wave rectification circuit method or an insulated gate bipolar mode transistor (IGBT) Alternatively, a pulse width modulation (PWM) converter circuit using a field effect transistor (FET) may be configured.

In addition, the inverter unit 32 can change the DC power input from the rectifier 31 to AC power of a desired frequency and size, and a three-phase inverter method using six power devices (IGBT or FET, etc.) and 4 It can be configured as a single-phase inverter method using four power elements.

4A and 4B are exemplary views for explaining the configuration of the power converter according to the first embodiment of the present invention, and when the rectifier 31 is configured as a full-wave rectifier circuit of a single module, the configuration of the inverter part 32 is shown. .

As shown in the figure, the rectifying unit 31 may be composed of full-wave rectifying circuits 31A and 31B composed of diodes, and in this case, may be composed of a plurality of inverter units 32A outputting a single phase, (FIG. 4A), it may be composed of a plurality of inverter units 32B outputting three phases (FIG. 4B).

That is, when connected to a plurality of single-phase loads 40, the power converter 30 configured as shown in FIG. 4a may be used, and when connected to a plurality of three-phase loads 40, the power converter configured as shown in FIG. 4b (30) could be used. The inverter unit 32A of FIG. 4A is composed of four power elements and can output single-phase AC power, respectively, and the inverter unit 32B of FIG. 4B is composed of six power elements and can output three-phase AC power, respectively. have. Since the detailed operation has already been widely known in the technical field to which the present invention pertains, a detailed description thereof will be omitted.

In addition, in FIGS. 4A and 4B , the rectifiers 31A and 31B are illustrated as being composed of one rectifying diode, but the present invention is not limited thereto, and various circuits can be configured by a plurality of rectifying diodes.

5A and 5B are exemplary views for explaining the configuration of the power converter according to the second embodiment of the present invention, and shows the configuration of the inverter part 32 when the rectifying part 31 is configured as a power device of a single module.

As shown in the figure, the rectifying unit 31 may be composed of power devices 31C and 31D such as IGBTs or FETs, and in this case, may be composed of a plurality of inverter units 32C outputting a single phase ( 5A), it may be configured by a plurality of inverter units 32D outputting three phases (FIG. 5B).

That is, when connected to a plurality of single-phase loads 40, the power converter 30 configured as shown in FIG. 5a may be used, and when connected to a plurality of three-phase loads 40, the power converter configured as shown in FIG. 5b (30) could be used. The inverter unit 32C of FIG. 5A is composed of four power elements and can output single-phase AC power, respectively, and the inverter unit 32D of FIG. 5B is composed of six power elements and can output three-phase AC power, respectively. have.

In the case of FIGS. 4 and 5, for example, if the inverter unit 32 for each module is configured with 1 kW capacity and 3 kW capacity and combined, it can be configured to respond to loads of 1 kW, 2 kW, 3 kW, 4 kW and 6 kW capacity. have. As described above, by configuring the capacity of the inverter unit 32 in various ways and configuring the plurality of inverter units 32 , it will be possible to respond to the load in more various combinations.

6A and 6B are exemplary views for explaining the configuration of the power converter according to the third embodiment of the present invention, and when the rectifier 31 is configured as a full-wave rectifier circuit of a plurality of modules, the configuration of the inverter part 32 is shown. .

As shown in the drawing, the rectifying unit 31 may be composed of a plurality of modules 31E and 31F in which one module is composed of a rectifying diode, and in this case, may be connected to an inverter unit 32E that outputs a single phase. Also (FIG. 6A), it may be connected to the inverter unit 32F that outputs three phases (FIG. 6B).

That is, the N-phase power is received by the rectifying unit 31E of the plurality of modules and converted into DC power, any one of which may be connected to the single-phase inverter unit 32E, and the N-phase power is transferred to the rectifying unit of the plurality of modules. 31F receives and converts each into DC power, and any one of them may be connected to the three-phase inverter unit 32F.

At this time, the inverter unit 32E of FIG. 6A is composed of four power elements to output single-phase AC power, and the inverter unit 32F of FIG. 6B is composed of six power elements and can output three-phase AC power. have.

7A and 7B are exemplary views for explaining the configuration of the power converter according to the fourth embodiment of the present invention, and shows the configuration of the inverter part 32 when the rectifying part 31 is composed of a plurality of power devices of the module.

As shown in the figure, the rectifying unit 31 may be composed of a plurality of modules 31G and 31H in which one module is composed of a power device such as an IGBT or FET, and in this case, an inverter unit 32G that outputs a single phase ) may be configured (FIG. 7a), or may be configured as an inverter unit 32H outputting three phases (FIG. 7B).

That is, the N-phase power is received by the rectifying unit 31G of the plurality of modules and converted into DC power, any one of which may be connected to the single-phase inverter unit 32G, and the N-phase power is transferred to the rectifying unit of the plurality of modules. 31H receives and converts each to DC power, and any one of them may be connected to the three-phase inverter unit 32H.

At this time, the inverter unit 32G of FIG. 7A is composed of four power elements and can output single-phase AC power, and the inverter unit 32H of FIG. 7B is composed of six power elements and can output three-phase AC power. have.

In one embodiment of the present invention, the waveform of the rectified voltage output through the rectifying unit 31 is as follows.

구간에서의 파형은 다음 수학식과 같다.In this case, if N is an even number,

The waveform in the section is as follows.

That is, when N is an even number, since there is a pair of sine waves whose phase is inverted, the ripple becomes relatively large.

구간에서의 파형은 다음과 같다.On the other hand, if N is odd,

The waveform in the section is as follows.

That is, since there is no sine wave pair whose phase is inverted as described above, the ripple becomes smaller, and it can be confirmed that the ripple becomes smaller as N increases.

As such, in the power converter 30 of an embodiment of the present invention, the electrolytic capacitor used between the conventional rectifying unit 31 and the inverter unit 32 is removed by the N-phase generator 20, thereby reducing the size of the system. have.

The controller 50 may control the speed of the engine 10 by controlling the governor of the engine according to the size of the load 40 . In addition, the control unit 50 may control the power converter 30 to operate at a high-efficiency operating point according to the operation of the inverter unit 32 and the size of the load 40 .

Although the embodiments according to the present invention have been described above, these are merely exemplary, and those of ordinary skill in the art will understand that various modifications and equivalent ranges of embodiments are possible therefrom. Accordingly, the true technical protection scope of the present invention should be defined by the following claims.

10: engine 20: N-phase generator
30: power converter 40: load
50: control unit

Claims (6)

a generator driven by the rotation of the engine and outputting N-phase (N is an odd number of 3 or more) power;
a power converter that transmits the N-phase power output from the generator to a load, and is connected in parallel per winding of the generator; and
A control unit for controlling the speed of the engine according to the size of the load, and controlling the operation of the power converter according to the size of the load,
The power converter is
a rectifier for rectifying the N-phase AC power into DC power; and
and an inverter unit that converts the DC power received from the rectifier into AC power of a predetermined frequency and applies it to the load,
When the load connected to the inverter unit is a plurality of single-phase loads,
The inverter unit is composed of four power elements to output single-phase AC power,
When the load connected to the inverter unit is a plurality of three-phase loads,
The inverter unit is composed of six power elements to output three-phase AC power generator system.
According to claim 1,
The rectifier consists of a rectifier circuit of a single module that converts N-phase power to DC power,
The inverter unit is a generator system comprising a plurality of modules for outputting single-phase AC power or a plurality of modules for outputting three-phase AC power.
According to claim 1,
The rectifier is composed of a single module power device that converts N-phase power to DC power,
The inverter unit is a generator system comprising a plurality of modules for outputting single-phase AC power or a plurality of modules for outputting three-phase AC power.
According to claim 1,
The rectifier is composed of a rectifying circuit of a plurality of modules that converts N-phase power to DC power, respectively,
The inverter unit is a generator system comprising a single module for outputting single-phase AC power or a single module for outputting three-phase AC power.
According to claim 1,
The rectifying unit is composed of power elements of a plurality of modules that each convert the N-phase power to DC power,
The inverter unit is a generator system comprising a single module for outputting single-phase AC power or a single module for outputting three-phase AC power.
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