JP2002238161A - Output method for generator for distributed power source - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problems of requirement of a large-scaled device and high device cost in the case of a three-phase inverter, when system is interconnected by an inverter, and the problems of circuit design and wiring work becoming disorderly along with the need for instantaneous interruption preventing mechanism, in a single-phase load, in the case of using a power source change-over switch. SOLUTION: For the armature of a generator 3, a three-phase two-winding armature is used. The three-phase output of a single armature winding 20a is rectified and smoothed via diodes 21a and a capacitor 22a, and is system- interconnected, after that, to commercial single-phase three lines U1.O1.V1 via an inverter 6. The three-phase output of the other armature winding 20b are rectified and smoothed with diodes 21b and a capacitor 22b and is supplied to at least one battery 16 after that.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a generator for a distributed power source driven by an internal combustion engine, and more particularly to an output method from the generator.

[0002]

2. Description of the Related Art In recent years, a distributed generator driven by an internal combustion engine such as a gas engine or a diesel engine has been used to supply power demand of power consuming devices (loads) and to recover waste heat generated by the generator due to power generation. Cogeneration systems that perform heat exchange of water using the recovered heat have been widely used. The power supply to the load is performed by connecting the commercial power system of the external commercial power supply and the generator output to each other via an inverter, or by switching with a power switch. When the switching is performed by the power switch, the commercial power and the generator output are switched and supplied to a specific load.

[0003] In addition, one of the distributed generators is configured to output only one of single-phase or three-phase power depending on the arrangement of coils in the stator.

[0004]

In the case of system interconnection between commercial three-phase power and output power from the generator, after rectifying and smoothing the output from the generator, the three-phase inverter outputs the three-phase power. Perform output. Then, the phases of the commercial power and the power from the generator are matched. However, a three-phase inverter requires a large device and a high cost.

[0005] In the case of a generator that outputs single-phase power, a three-phase inverter is required to supply power to a three-phase load. And, if a three-phase inverter is not used to avoid the above-mentioned high cost, it is impossible to supply power to a three-phase load only with a generator that outputs single-phase power. Power generators.

In the case where the single-phase power output from the inverter is switched between the system interconnection side and the direct connection side using the power switch, in order to increase the utilization rate of the generator,
Fine division of single-phase loads is required. However, the design and wiring work of such a division becomes complicated, maintenance is not easy, and the overall cost increases. In addition, since single-phase loads generally dislike instantaneous interruption of power, a single-phase power switch needs to have a mechanism for preventing instantaneous interruption, resulting in high cost.

[0007]

The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described. That is, as described in claim 1, in the power generator driven by the internal combustion engine, the armature of the generator has three-phase two windings, and the three-phase output of one armature winding is rectified and smoothed, and then passed through the inverter. The three-phase output of the other armature winding is rectified and smoothed and then supplied to at least one charged object.

According to a second aspect of the present invention, in the power generator of the internal combustion engine drive, the armature of the generator is formed of three-phase two windings, and the three-phase output of one armature winding is rectified and smoothed, and then the inverter is driven. And the three-phase output of the other armature winding is supplied directly to at least one object to be charged.

According to a third aspect of the present invention, in the power generation device driven by the internal combustion engine, the exhaust heat of the internal combustion engine is supplied to a heat storage device.

[0010]

Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a circuit diagram of a cogeneration system according to a first embodiment in which one of the generator outputs is connected to a commercial single-phase three-wire system and the other is converted into DC power and output. One of the machine outputs is commercial single-phase 3
FIG. 10 is a circuit diagram of a cogeneration system of a second embodiment in which the system is interconnected with a line and the other is output as three-phase power.

[Configuration of cogeneration system]
First, a cogeneration system 1 according to the present invention will be described with reference to FIG. The cogeneration system 1 mainly includes a prime mover 2, a generator 3, and a heat storage device 1.
3. It comprises a control device 5 and an inverter 6.

The prime mover 2 is an internal combustion engine, and a cooling radiator fan 7 is provided near the prime mover 2.
In the present embodiment, the heat storage device 13 is a hot water storage tank, and the exhaust heat from the prime mover 2 is supplied to the heat storage device 13 via the circulating cooling water passage 9. Then, hot water is obtained from the heat storage device 13 using the exhaust heat of the prime mover 2.

The prime mover 2 is provided with a starter 10, and power is supplied to the starter 10 from a power transmission system U3 / V3 (including a power generation system U2 / V2) described later via a transformer 11. Have been done.

The generator 3 is provided with a rotor (not shown) having a field winding excited by a DC power supply on a rotating shaft 12 connected to a drive shaft of the prime mover 2 and a stator (not shown). The three-phase output is taken out from the armature. The generator 3 has an armature winding 20a as an armature.
20b is provided, and the armature has two windings for outputting three-phase power. The arrangement of the armature windings 20a and 20b may be either a shunt type or a tandem type. Then, electromagnetic induction is generated by rotation of the field winding (rotor), and voltage is generated in each of the armature windings 20a and 20b. The armature windings 20a and 20b are provided with three output terminals.
Three-phase power is output from 0a and 20b. Generator 3
In the above description, the rotor is provided with a field winding and the stator is provided with an armature (rotating field type). However, the rotor is provided with an armature, and the stator is provided with a field winding (rotating). Armature type).

An automatic voltage regulator (hereinafter referred to as A)
VR) 14 for controlling the power supplied to the field winding. The AVR 14 adjusts the magnitude of the magnetic field excited by the field winding to keep the voltage value output from the armature windings 20a and 20b constant.

In the first embodiment, the output of one armature winding 20a is connected to a commercial single-phase three-wire system and supplied to the single-phase load, while the output of the other armature winding 20b is connected to a single-phase load. It is supplied to the charged object side. First, the armature winding 20
An output method of the generator 3 from the side a will be described. The three-phase output 30a from the armature winding 20a is
a and rectified and smoothed by the capacitor 22a and connected to the DC input of the inverter 6. Then, the inverter 6 outputs the generated power system U2 · V2, and the output is connected to the commercial power system U1 / V1 described later.

The prime mover 2, the generator 3, and the inverter 6, which are the main components of the cogeneration system 1 described above, are controlled by the controller 5. further,
The operation of the cogeneration system 1 is managed by an operation display 28 and a remote operation display 29 for displaying and changing the operation state of the control device 5.

From the external commercial power supply 40, a single-phase three-wire 200
V commercial power system U1, O1, V1 is drawn. There is a potential difference of 200 V between the commercial power systems U1 and V1, the commercial power system O1 is a neutral line, and the commercial power system U1
・ 100V between O1 and commercial power system O1 ・ V1
Is caused to occur. Commercial power system U1
Power generation systems U2 and V2 from the cogeneration system 1 are connected in parallel to V1. Power generation system U2
The potential difference between V2 is also set to 200 V by the inverter 6, and power is supplied in accordance with the potential difference between the commercial power system U1 and V1. Then, system interconnection between the commercial power system U1 · V1 and the generated power system U2 · V2 is performed. The electric power connected as described above (the transmission system U3 / O3
V3) is a power consuming device (hereinafter, single-phase load) 24.2
Power is being transmitted to 4 ...

Also, load current detecting current transformers (current transformers) CT1 and CT2 are connected to the commercial power system U1 and V1.
Are provided, and the current value supplied to the single-phase loads 24 through the commercial power system U1, V1 is detected. The current value of the commercial power system U1, V1 changes according to the power consumption of the single-phase loads 24, 24,. In order to stably supply power to the single-phase loads 24, 24,..., Power is supplied from the inverter 6 and the power value input to the single-phase loads 24, 24,. Like that. Therefore, according to the current values of the commercial power systems U1 and V1 detected by the load current detection current transformers CT1 and CT2, the inverter 6 outputs the generated power systems U2 and V2 having appropriate current values. I have to.

A specific example of the operation of the cogeneration system 1 performed by the above system interconnection will be described below. (1) When the power consumption of the single-phase load increases The power demand in the power transmission system U3 / O3 / V3 increases,
Accordingly, the amount of power flowing through the commercial power system U1, O1, V1 increases. Here, the power transmission system is a system in which the commercial power system and the power generation electric system are interconnected. Then, the increase value of the electric energy of the commercial power system U1, V1 is calculated by the inverter 6 from the load current detection current transformers CT1, CT2. Inverter 6 controls inverter 6 to increase generated power system U2 · V2 accordingly.

(2) When the power consumption of the single-phase load decreases The power demand in the transmission system U3, O3, V3 decreases,
Accordingly, the amount of power flowing through the commercial power system U1, O1, V1 decreases. Then, the decrease value of the electric energy of the commercial power system U1, V1 is determined by the load current detection current transformers CT1, CT2.
Is calculated by the inverter 6. And the inverter 6
The inverter 6 is controlled so as to reduce the generated power systems U2 and V2 accordingly.

With the above configuration, as shown in FIG. 1, a three-phase output 30a is taken out from each armature winding 20a, and the three-phase output 30a is rectified and smoothed by a diode 21a and a capacitor 22a. 6 DC input section. The output from the inverter 6 forms the power generation system U2 · V2 of the cogeneration system 1.

Next, the output from the armature winding 20b will be described. As shown in FIG. 1, the armature winding 20b
Output from the diode 21b and the capacitor 2
The DC power D is rectified and smoothed by 2b. Then, the DC power D is output from the cogeneration system 1.

The cogeneration system 1 is provided with an output terminal for outputting the DC power D to the outside, and the storage batteries 16 can be connected to the output terminal. Then, the storage battery 16 can be charged with the DC power D. The storage battery 16 is provided as a power source for an electric device that is an object to be charged. In the present embodiment, the electric device is an electric vehicle 17 such as a golf cart. In other words, the cogeneration system 1
At least one electric vehicle 17 is supplied with electric power for charging.

As described above, the cogeneration system 1 can supply electric power to the single-phase loads 24, 24,... And the electric vehicles 17, 17,. Can be supplied. For example, by applying the cogeneration system 1 of the present embodiment to a golf course, a golf cart (the electric vehicles 17, 17,...) Is driven, and power consumption devices such as lighting in homes and home appliances are used. (The single-phase load 24.2)
4) are supplied with power. Furthermore, it becomes possible to supply hot water to a shower or a bathtub at the same time as power supply. The above is performed by one drive source (the prime mover 2).

Next, a second embodiment will be described with reference to FIG. In the second embodiment, the output from the armature winding 20b is directly supplied to the cogeneration system 201.
Output to the outside. The output is a three-phase alternating current A.

In the first embodiment, as in the second embodiment, the cogeneration system 201 is provided with an output terminal for outputting to the outside, and the charging circuit 18 is connected to the output terminal.
.. Can be connected. The three-phase alternating current A can be supplied to the charging circuits 18. The charging circuit 18 is provided as a power source of an electric device that is an object to be charged. In the present embodiment, the electric device is an electric vehicle 19 such as a golf cart. The charging device 18 includes a diode 23, a capacitor 25, and a storage battery 26. Then, the three-phase AC current A input to the charging circuit 18 is rectified and smoothed by the diode 23 and the capacitor 25, and then charged into the storage battery 26.

In the above description, the output of the generator 3 is connected to the commercial single-phase three-wire system. Further, it is possible to connect the output of the generator 3 to the commercial three-phase three-wire system, and this will be described with reference to FIGS. FIG. 3 is a circuit diagram of a cogeneration system according to a third embodiment in which one of the generator outputs is connected to a commercial three-phase three-wire system and the other is converted into DC power and output. FIG. 13 is a circuit diagram of a cogeneration system according to a fourth embodiment in which one of machine outputs is system-connected to a commercial three-phase three-wire system and the other is output as three-phase electric power. That is, the third embodiment shown in FIG. 3 is a case where the commercial power is three-phase three-wire in the first embodiment shown in FIG. 1, and the fourth embodiment shown in FIG. This is a case where the commercial power is three-phase three-wire in the embodiment.

When the generator 3 and the commercial three-phase three-wire system are interconnected, one armature winding 2 of the generator 3 is provided.
The output of 0a is connected to the three-phase load side while being system-linked to the commercial three-phase three-wire, and the output of the other armature winding 20b is supplied to the charged object side. The three-phase output 30a from the armature winding 20a is rectified and smoothed by the diode 21a and the capacitor 22a, and is connected to the DC input of the inverter 36. Then, the generated power system u2, w2, and v2 is output from the inverter 36, and the output is connected to the commercial power system u1, w1, and v1.
Here, the inverter 36 can output three-phase power by power conversion.

As shown in FIG. 3 and FIG.
1 is a three-phase three-wire 200V commercial power system u1, w1
V1 has been subtracted. Then, the commercial power system u1 · w
1 ・ v1 with cogeneration system 301.4
The power generation systems u2, w2, and v2 from 01 are connected in parallel. Here, the potential difference between the generated power systems u2, w2, and v2 is also set to 200 V by the inverter 36, and power is supplied in accordance with the potential difference with the commercial power system u1, w1, and v1. Then, system interconnection between the commercial power system u1, w1, and v1 and the generated power system u2, w2, and v2 is performed. The power (the transmission system u
3 · w3 · v3) is a power consuming device (hereinafter, three-phase load)
34, 34...

Also, a load current detecting current transformer (current transformer) CT1 is connected to the commercial power system u1, w1, and v1.
CT2 and CT3 are provided, and the commercial power system u
The current value supplied to the three-phase loads 34, 34,... Passing through 1.w1, v1 is detected. Then, similarly to the inverter 6, the commercial power system u1 detected by the load current detecting current transformers CT1, CT2, CT3
In accordance with the current values of w1 and v1, the inverter 36 outputs a generated power system u2, w2, and v2 having an appropriate current value.

As described above, the three-phase loads 34, 34
, And electric power can be supplied to the electric vehicles 17 and the heat storage device 13 can be supplied with heat.

[0033]

Since the present invention is constructed as described above, the following effects can be obtained. That is, in the power generating device driven by the internal combustion engine, the armature of the generator is a three-phase two-winding, and the three-phase output of one of the armature windings is rectified and smoothed. The three-phase output of the other armature winding is rectified and smoothed and supplied to at least one object to be charged, so that one generator supplies power to the load and the object to be charged such as an electric vehicle. Can be supplied. Also, by performing grid connection to the load,
The generator output is supplied effectively and stably. Furthermore, when the system interconnection is performed with a commercial single-phase three-wire system, it is not necessary to use a three-phase inverter, and a cogeneration system can be configured only by providing a small inverter device, leading to cost reduction.

According to a second aspect of the present invention, in the power generator of the internal combustion engine drive, the armature of the generator has three phases and two windings, and the three phase output of one armature winding is rectified and smoothed, and then the inverter is turned on. System, and the three-phase output of the other armature winding is directly supplied to at least one object to be charged.
Charging can be performed efficiently.

According to a third aspect of the present invention, in the power generator driven by the internal combustion engine, since the exhaust heat of the internal combustion engine is supplied to the heat storage device, hot water can be supplied together with the electric power.
A cogeneration system can be configured.

[Brief description of the drawings]

FIG. 1 is a circuit diagram of a cogeneration system according to a first embodiment in which one of the generator outputs is connected to a commercial single-phase three-wire system and the other is converted into DC power and output.

FIG. 2 is a circuit diagram of a cogeneration system according to a second embodiment in which one of the generator outputs is system-connected to a commercial single-phase three-wire system and the other is output as three-phase power.

FIG. 3 is a circuit diagram of a cogeneration system according to a third embodiment in which one of the generator outputs is connected to a commercial three-phase three-wire system and the other is converted into DC power and output.

FIG. 4 is a circuit diagram of a cogeneration system according to a fourth embodiment in which one of the generator outputs is connected to a commercial three-phase three-wire system and the other is output as three-phase power.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ・ 201 ・ 301 ・ 401 Cogeneration system 2 Motor 3 Generator 6 ・ 36 Inverter 13 Heat storage device 16 ・ 26 Storage battery 17 ・ 19 Electric vehicle 18 Charging circuit 20a ・ 20b Armature winding 21a ・ 21b ・ 23 Diode 22a ・ 22b・ 25 Capacitor 30a ・ 30b Three-phase output 40 External commercial power supply

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5G066 HA30 HB02 5H007 AA00 BB07 CA01 CC12 DA05 DC02 5H590 AA04 AA08 AA10 CA07 CA26 CC01 CC24 CC34 CD01 CD03 CE01 CE05 DD23 DD77 EB12 HA04

Claims (3)

[Claims] In a power generator driven by an internal combustion engine, an armature of a generator is a three-phase two-winding, and a three-phase output of one of the armature windings is rectified and smoothed, and then system-connected to commercial power via an inverter. A method for outputting a generator for a distributed power source, wherein the three-phase output of the other armature winding is rectified and smoothed and then supplied to at least one object to be charged. 2. An internal combustion engine-driven power generator, wherein an armature of the generator is a three-phase two-winding, and a three-phase output of one of the armature windings is rectified and smoothed, and then system-connected to commercial power via an inverter. A method of outputting a generator for a distributed power source, wherein the three-phase output of the other armature winding is directly supplied to at least one object to be charged. 3. An output method for a generator for a distributed power source, wherein the exhaust heat of the internal combustion engine is supplied to a heat storage device in the power generator driven by the internal combustion engine.