JP3143742B2 - Suppression device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a private power generation system for supplying power to a harmonic generation load and a general load.
The present invention relates to a suppression device that suppresses a harmonic current and a short-circuit current.

[0002]

2. Description of the Related Art FIG. 4 shows an example of a conventional private power generation system. In the figure, a commercial power system 1 supplies power to a private power generation installation customer 2 and another customer 3. In the private power generation installation customer 2, a route for supplying power from the private power generator 9 to the harmonic generation load 10 via the circuit breakers 7 and 8, the commercial power system 1 to the circuit breaker 6, the filter equipment 1.
1. A route for supplying power to the harmonic generation load 10 via the circuit breaker 8 is provided. The filter equipment 11 includes a current limiting reactor 12, capacitors 13, 15 and a reactor 1
And 4. Further, the other consumers 3 are configured to supply power from the commercial power system 1 to the general load 4 via the circuit breaker 5.

The operation of the conventional private power generation system will be described below. In the conventional in-house power generation system, when there is a harmonic generation load 10 such as power electronics equipment in the premises of the in-house power generation installation customer 2, the generated harmonic current flows out to the system, and the general load of the other customers 3 In order not to adversely affect the filter No. 4, a configuration is adopted in which the filter equipment 11 is installed and a harmonic current is absorbed therein. The filter equipment 11 includes a capacitor 13 that forms a filter that absorbs high-order harmonics, a reactor 14 and a capacitor 15 that forms a specific-order filter that absorbs low-order harmonics of a specific order, and a harmonic system. A current limiting reactor 12 constituting a current limiting device for limiting outflow is provided.
It also has the function of suppressing the short-circuit current flowing into the accident point from the accident. This is to prevent a situation in which another customer 3 has to increase the breaking capability of the circuit breaker 5 because the customer 2 has installed private power generation.

[0004]

As described above, in the conventional private power generation system, even when there is a load for generating harmonics in the premises of the private power generation facility customer, the harmonics and short-circuit current flowing out to the system by the filter facility are not generated. It has a structure that does not adversely affect other customers. However, since a short-life capacitor is used for the filter equipment,
Its regular replacement is necessary. In addition, when the harmonic generation load generates harmonics of a plurality of orders, a plurality of specific order filters are required, so that there is a problem that the filter equipment becomes large.

The present invention (corresponding to claims 1 to 3 ) provides
The purpose of the present invention is to provide a highly reliable and small suppressing device that does not use a capacitor.

[0006]

In order to achieve the above object, a first aspect of the present invention is a private power generator connected to a system for supplying active power or reactive power to a harmonic generation load by a generator. In a system, a double winding reactor having a primary and a secondary winding for one phase, one end of the secondary winding is connected to the harmonic generating load, and one end of the primary winding is connected to a general load. connect, the connecting armature terminal of another terminal and the generator of the primary winding the secondary winding, before
It suppresses harmonic current and short circuit current to general load.
Thus, the number of turns of the primary winding and the number of turns of the secondary winding
The ratio of the number to the internal inductance of the generator and the primary
・ Make the ratio to the mutual inductance of the secondary winding
The number of turns of the primary winding from the number of turns of the secondary winding.
It is characterized by having increased.

[0007]

According to a second aspect of the present invention, in the suppression device according to the first aspect, a synchronous phase shifter is used instead of the generator. Claim 3 of the present invention is based on Claim 1 and Contract
The suppression device according to claim 2, wherein a main shaft drive power generation system of a ship is used instead of the private power generation system, and the harmonic generation load is a power generation inverter.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a configuration diagram of a private power generation system according to a first embodiment (corresponding to claims 1 and 2 ) of the present invention.

In the figure, the configuration different from the conventional private power generation system of FIG. 4 already described is that a double winding reactor 16 is provided instead of the filter equipment 11, and the other configuration is the same. The same components are denoted by the same reference numerals, and description thereof will be omitted.

The double winding reactor 16 used in this embodiment
Has a primary winding and a secondary winding wound on the same iron core, and a private generator 9 is connected via a circuit breaker 7 to a connection point between the two windings.

FIG. 2 shows the principle of operation of this double winding reactor.
This will be described with reference to the circuit diagram of FIG. In the figure, 9 is a private generator (synchronous machine), 91 is an internal induced voltage (↑ E),
92 is an internal inductance (LG). The double winding reactor 16 has a primary winding 161 and a secondary winding 162. Here, n1 is the number of turns of the primary winding, n2 is the number of turns of the secondary winding, L1 and L2 are the self-inductance of each winding, M is the mutual inductance, and ΔV2 is the load terminal of the double winding reactor. Voltage, ΔV1 is the power supply terminal voltage, ΔI
Assuming that 1, ↑ I2 represents the illustrated current, the following equation is established. Note that ↑ before the sign represents a vector.

[0013]

(Equation 1)

In the above equation, if M · n1 / n2 = LG, ΔI1 is independent of ΔV2, so that the power supply side current ΔI1 is not affected by the harmonic generation load side voltage ΔV2.

By the way, when trying to obtain the current limiting effect of the short-circuit current from the same generator as the conventional private power generation system of FIG. 4, if n1 = n2, the capacity of the reactor becomes 2
(In the case of a double winding reactor, the current limiting effect is L1
However, the reactor capacity is required to be L1 + L2), which leads to an increase in the price of equipment.

However, in this embodiment, if n1> n2 in accordance with the internal inductance of the generator, an increase in price can be suppressed. In addition, a large value can be selected for LG, and the physique of the generator can be suppressed.

As described above, according to this embodiment, it is possible to cope with harmonics of all orders, and it is not necessary to provide a multi-stage filter of a specific order as in the prior art, and it is not necessary to use a capacitor having a short life. .

As described above, in this embodiment, an example has been described in which the private generator is used as the rotating machine connected to the double-winding reactor. However, a similar effect can be obtained by using a synchronous phase adjuster instead of the private generator. . In the above description, an example of a self-powered system linked to a power system has been described. However, the present invention is not limited to this, and a similar effect is exerted when applied to a self-powered system that operates independently from the power system. .

[0019] FIG. 3 is a block diagram of a second embodiment (claim 3 correspond) is a ship marine main shaft drive generator system of the present invention. As shown in the figure, a case of applying to a main shaft drive generator system of the ship marine other than private power generation system in the present embodiment, rotating shaft generator 18 and the propeller 19 by the main engine 17. The electric power generated by the rotation of the shaft generator 18 is supplied to the power generation inverter 20 and the double winding reactor 1.
6 and is supplied to the inboard bus 22. Reference numeral 21 denotes a synchronous phase adjuster.

In this embodiment as well, if M · n1 / n2 = LG is selected, harmonics are suppressed best, but if this is not possible due to restrictions on equipment cost, physical size, etc., a value close to this is selected. However, it has a considerable effect. Conversely, if some harmonics and short-circuit current are allowed, M · n1 / n
It is also possible to select a value that minimizes the cost and physique of the device at a value close to 2 = LG. The same effect as in the first embodiment can be obtained by applying the double-winding reactor suppression device to the marine main shaft drive power generation system as in the present embodiment.

[0021]

As described above, the present invention (Claim 1)
According to the third aspect of the present invention, the suppression device for suppressing the harmonic current and the short-circuit current in the private power generation system for supplying power to the harmonic generation load and the general load and the main shaft drive power generation device of the ship has a short life. Even without using a capacitor, it is possible to suppress the outflow of harmonics of all orders generated from the harmonic generation load into the system, so that a large effect is achieved in miniaturization and high reliability of the suppression device.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a suppression device according to a first embodiment of the present invention.

FIG. 2 is a diagram for explaining the double winding reactor of FIG. 1;

FIG. 3 is a configuration diagram of a suppression device according to a second embodiment of the present invention.

FIG. 4 is a configuration diagram of a conventional private power generation system.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Commercial electric power system, 2 ... Private power generation installation customer, 3 ... Other customers, 4 ... General load, 5, 6, 7, 8 ... Circuit breaker, 9 ...
In-house generator, 10: harmonic generation load, 11: filter equipment, 12: current limiting reactor, 13, 15: condenser,
14 ... reactor, 16 ... double winding reactor, 17 ...
Main engine, 18 ... Shaft generator, 19 ... Propeller, 2
0: power generation inverter, 21: synchronous phase adjuster, 22: inboard bus.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H02J 3 / 01,3 / 38 H01P 9/04

Claims (3)

(57) [Claims] In a private power generation system interconnected with a system that supplies active power or reactive power to a harmonic generation load by a generator, a double-winding reactor having a primary and a secondary winding for one phase. And one end of the secondary winding is connected to the harmonic generating load, one end of the primary winding is connected to a general load, and the other terminals of the primary winding and the secondary winding are connected to the generator. And the general load
To suppress harmonic current as well as short-circuit current to
The ratio of the number of turns of the primary winding and the number of turns of the secondary winding,
The internal inductance of the generator and the primary and secondary windings
Of the primary
The suppression device , wherein the number of turns of the winding is greater than the number of turns of the secondary winding . 2. The suppression device according to claim 1, wherein a synchronous phase shifter is used instead of the generator. 3. The suppression device according to claim 1, wherein the main shaft drive power generation system of the ship is used instead of the private power generation system, and the harmonic generation load is a power generation inverter. Suppression device.