JP2015195658A - power supply system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To appropriately supply power to a load facility from a power generation unit capable of reception power constant control without wasting resources such as a current converter and a power generator control unit comprised from the beginning in the power generation unit regardless of the state of the load facility and an installation environment.SOLUTION: A power supply system 200 comprises: a power generator 12 that is connected with a power supply path 20 from a power company and a load facility 22, and supplies power to the load facility; an extension current converter 130 through which the power supply path passes and which converts a current value on the power supply path into a measurement value; a transmission unit 132 that transmits the measurement value obtained through conversion by the extension current converter through a communication line; a reception unit 134 that receives the measurement value from the transmission unit; an additional control unit 110 that has control current flow through an additional control path according to the measurement value received by the reception unit; a power generator current converter 14 that converts a current value on the additional control path into a measurement value; and a power generator control unit 16 that controls output power from the power generator so that the measurement value obtained through conversion by the power generator current converter is a prescribed value.

Description

  The present invention relates to a power supply system that supplies power to a load facility from a power generation unit capable of constant control of received power.

  A power generation unit capable of constant control of received power is used as a means to cover the power consumption of a load facility on the premises with a generator in the premises while receiving power (commercial power) from an electric power company. In the received power constant control, the power supply path from the power company, the generator, and the load facility are connected, and the power (received power) supplied from the power company at the power receiving point is a predetermined value (for example, 0). By controlling the output power of the generator so as to become, it becomes possible to absorb the load fluctuation of the load facility by the generator.

  In such a power generation unit capable of constant control of received power, a technique for improving the operating rate of the generator is known (for example, Patent Document 1).

JP-A-10-224992

  Such a power generation unit capable of constant control of received power, that is, a current transformer (CT: Current Transformer) installed at a power receiving point, and a generator so that a measured value transformed by the current transformer becomes a predetermined value. A power generation unit in which a generator control unit that controls output is combined with a generator has high versatility, and is applied to load facilities for various purposes.

  However, since the power generation unit is a mass-produced product, the length of the connection between the current transformer and the generator control unit is often limited. Therefore, there is no problem if the power receiving point and the generator are close to each other. However, if multiple load facilities are provided apart from each other and the power receiving point and the generator are physically separated, a current transformer is installed at the power receiving point. There are cases where it is not possible. In addition, the current transformer may not be installed due to restrictions on the installation environment of the current transformer, for example, because the installation location is exposed to ultraviolet rays or salt damage is likely to occur. If a current transformer cannot be installed, the received power constant control cannot be performed in the first place.

  In view of such a problem, the present invention is capable of receiving power without wasting resources such as a current transformer and a generator control unit originally provided in the power generation unit regardless of the state of the load facility and the installation environment of the current transformer. An object of the present invention is to provide a power supply system capable of appropriately supplying power to a load facility from a power generation unit capable of constant control.

  In order to solve the above problems, the power supply system of the present invention is connected to a power supply path and a load facility from an electric power company, and a generator that supplies power to the load facility, and the power supply path are inserted, An extension current transformer that transforms the current value of the power supply path into a measurement value, a transmission unit that transmits the measurement value transformed by the extension current transformer through a communication line, and a reception unit that receives the measurement value from the transmission unit, An additional control unit that sends control current to the additional control path according to the measurement value received by the receiver, a current transformer for the generator that transforms the current value of the additional control path into the measurement value, and a current transformer for the generator. And a generator control unit that controls output power of the generator so that the transformed measurement value becomes a predetermined value.

  The additional control path may be wound any number of times from 3 to 30 times around the penetration body of the generator current transformer.

  The additional control path is formed in a variable part that can be wound any number of times from 3 to 30 times and is variable in the number of turns in the through body of the current transformer for the generator. The control current may be controlled by changing the number of turns of the part.

  The additional control path may be provided with a variable resistor having a variable resistance value, and the additional control unit may control the control current by changing the resistance value of the variable resistor.

  According to the present invention, it is possible to perform constant control of received power without wasting resources such as a current transformer and a generator control unit originally provided in the power generation unit, regardless of the state of the load equipment and the installation environment of the current transformer. It is possible to appropriately supply power from the power generation unit to the load facility.

It is explanatory drawing for demonstrating the electric power generation unit in which received electric power constant control is possible. It is explanatory drawing which showed schematic structure of the electric power supply system in 1st Embodiment. It is explanatory drawing for demonstrating control of the output electric power of a generator by an additional control part. It is explanatory drawing for demonstrating control of the output electric power of a generator by an additional control part. It is explanatory drawing which showed schematic structure of the electric power supply system in 2nd Embodiment. It is explanatory drawing for demonstrating an additional control path. It is another explanatory view for explaining an additional control way.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The dimensions, materials, and other specific numerical values shown in the embodiments are merely examples for facilitating the understanding of the invention, and do not limit the present invention unless otherwise specified. In the present specification and drawings, elements having substantially the same function and configuration are denoted by the same reference numerals, and redundant description is omitted, and elements not directly related to the present invention are not illustrated. To do.

  FIG. 1 is an explanatory diagram for explaining a power generation unit 10 capable of constant control of received power. As shown in FIG. 1, the power generation unit 10 is configured to include a generator 12, a generator current transformer 14, and a generator controller 16. The generator 12 is connected to a power supply path 20 from a power company and a load facility 22 arranged on the premises, converts other energy into electric energy to generate electric power, and generates the generated electric power to the load facility 22. To supply. As such a generator, various other devices such as an electric motor and a fuel cell can be applied. In the current transformer 14 for generator, the power supply path 20 is inserted (clamped) into a through body (iron core, core) in which a primary winding is arranged at a power reception point, and the current value of the power supply path 20 is transformed into a measured value. To the generator control unit 16. The generator control unit 16 is composed of a CPU and a DSP, and the generator is configured so that the measurement value transformed by the generator current transformer 14 becomes a predetermined value (for example, 0) (so that the power receiving point is leveled). 12 output power is feedback controlled.

  Thus, in the power generation unit 10, the generator control unit 16 determines that the measured value transformed by the generator current transformer 14, that is, the current value flowing through the power receiving point is a predetermined value (assumed to be 0 here). Since the output power of the generator 12 is controlled so that the load fluctuation occurs in the load facility 22 as in the power transition shown in FIG. 1A, the power transition shown in FIG. As described above, the power corresponding to the fluctuation can be output to the generator 12. Thus, the power fluctuation at the power receiving point is theoretically maintained at 0 as in the power transition shown in FIG. However, in the present embodiment, for convenience of explanation, the power (current) at the power receiving point is described as 0. However, from the viewpoint of system protection such as prevention of reverse power flow due to load fluctuations, power is actually supplied from the power supply path 20. As (power purchase), a significant value is set as the predetermined value. The predetermined value is determined based on the power generation capacity of the generator 12 or the like.

  In the present embodiment, existing resources such as the generator current transformer 14 and the generator control unit 16 included in the power generation unit 10 capable of constant control of received power as described above are not wasted (modified) as they are. It is premised on a technique for effectively using and supplying power to the load facility 22 appropriately. Below, the electric power supply system 100 used as the premise of such this embodiment is demonstrated.

(First embodiment: power supply system 100)
FIG. 2 is an explanatory diagram showing a schematic configuration of the power supply system 100 according to the first embodiment. As shown in FIG. 2, the power supply system 100 includes a power generation unit 10 (a generator 12, a generator current transformer 14, a generator control unit 16) and an additional control unit 110. The power generation unit 10 is the same as that described with reference to FIG. The additional control unit 110 is configured by a CPU and a DSP. Along with the power supply path 20, the additional control unit 110 supplies a control current to the additional control path 112 inserted through the penetrating body of the generator current transformer 14, and generates power through the generator control unit 16. The output power of the machine 12 is indirectly controlled.

  3 and 4 are explanatory diagrams for explaining the control of the output power of the generator 12 by the additional control unit 110. Here, the power transition of (a), (b), (c) shown in FIG. 3 and FIG. 4 is the power transition in the direction of (a), (b), (c) of FIG. And the current transition of (d) shown in FIG. 4 is a current transition of the direction of (d) of FIG.

  When the additional control unit 110 causes a positive current as shown in FIG. 3D to flow in the additional control path 112 in the direction of FIG. 2D, a current corresponding to the amount added in the generator current transformer 14 is obtained. The generator control unit 16 recognizes that the current flow is due to power fluctuation at the power receiving point. Then, since the generator control unit 16 controls the output power of the generator 12 so that the measurement value transformed by the generator current transformer 14 becomes a predetermined value, the power output of the generator 12 is increased. Therefore, as shown in FIG. 3B, the power output of the generator 12 is increased while the additional control unit 110 is passing current, and the power equal to the increased amount (ΔP) is, for example, shown in FIG. As shown in c), the electric power is output to the power supply path 20 through the power receiving point.

  Further, when the additional control unit 110 causes a negative current as shown in FIG. 4D to flow in the additional control path 112 in the direction of FIG. 2D, the amount added to the generator current transformer 14 is increased. Thus, the generator control unit 16 recognizes that the current flow is caused by power fluctuation at the power receiving point, as in FIG. Then, the generator control unit 16 controls the output power of the generator 12 so that the measurement value transformed by the generator current transformer 14 becomes a predetermined value, so that the power output of the generator 12 is reduced. Therefore, as shown in FIG. 4B, while the additional control unit 110 is passing current, the power output of the generator 12 is lowered, and the power equal to the lowered amount (ΔP) is, for example, shown in FIG. As shown in c), it is replenished from the power supply path 20 through the power receiving point.

  Thus, while the existing power generation unit 10 is effectively used as it is without removing the generator current transformer 14 and the generator control section 16, the additional control section 110 passes through the generator current transformer 14. By causing a current to flow through the additional control path 112 inserted into the generator, the generator control unit 16 is made to recognize as if the current of the power supply path 20 has changed, and the output power of the generator 12 is individually controlled. Is possible.

  The output power control of the power generation unit 10 using the additional control unit 110 as described above can be applied to various uses. Hereinafter, application examples of the power generation unit 10 using the additional control unit 110 will be described.

(Second embodiment: power supply system 200)
Since the power generation unit 10 is a mass-produced product, the length of the connection connecting the generator current transformer 14 and the generator control unit 16 is often limited. Therefore, as shown in FIG. 1, when the power receiving point and the generator 12 are close to each other, no problem occurs. However, a plurality of load facilities 22 are provided apart from each other, and the power receiving point and the generator 12 are physically far from each other. In some cases, the generator current transformer 14 cannot be installed at the power receiving point. In addition, the generator current transformer 14 may not be installed due to restrictions on the installation environment of the generator current transformer 14, for example, because the installation location is exposed to ultraviolet rays or salt damage is likely to occur. The second embodiment aims to level the power fluctuations at the power receiving point even under such circumstances.

  FIG. 5 is an explanatory diagram showing a schematic configuration of the power supply system 200 according to the second embodiment. As shown in FIG. 5, the power supply system 200 includes a power generation unit 10 (a generator 12, a generator current transformer 14, a generator control unit 16), an additional control unit 110, an extension current transformer 130, A transmission unit 132 and a reception unit 134 are included.

  The power generation unit 10 is the same as that described with reference to FIG. The extension current transformer 130 inserts the power supply path 20 into a through body provided with a primary winding, and transforms the current value of the power supply path 20 into a measured value. The transmission part 132 transmits the measured value transformed by the extension current transformer 130 through a communication line. The reception unit 134 receives the measurement value from the transmission unit 132. The communication between the transmission unit 132 and the reception unit 134 may be wired or wireless, and any communication method can be adopted. As in the first embodiment, the additional control unit 110 controls the output power of the generator 12 by causing a control current to flow through the additional control path 112 inserted through the penetration body of the current transformer 14 together with the power supply path 20. To do. However, in the second embodiment, the additional control unit 110 causes a control current to flow through the additional control path 112 according to the measurement value received by the reception unit 134.

  Here, the distance that the connection between the generator current transformer 14 and the generator control unit 16 does not reach the power reception point is compensated by communication. That is, instead of the generator current transformer 14, the current value at the power receiving point is measured by the extension current transformer 130, and the measured value is transmitted to the additional control unit 110 through communication. And the measured value by the extension current transformer 130 is reproduced as a measured value of the generator current transformer 14 by flowing the transmitted measured value through the additional control path 112.

  Thus, even when the power receiving point and the generator 12 are physically distant from each other, the power fluctuation at the power receiving point, that is, the case where the plurality of load equipments 22 and the generator 12 are viewed as a single system as a whole. It becomes possible to level out power fluctuations for other systems.

(Additional control path 112)
Further, in the power supply system 100 and the power supply system 200, when the generator 12 is controlled by the control current by the additional control unit 110, the current change width received by the generator current transformer 14 by the control current, the power The change width of the current received by the generator current transformer 14 through the supply path 20 must be made equal. In order to increase the change width of the current received by the generator current transformer 14, the following means can be considered.
(1) The voltage value V applied to the additional control path 112 is increased.
(2) The resistance value R of the additional control path 112 is reduced.
(3) The additional control path 112 is wound around the penetration body of the generator current transformer 14 a plurality of times.

However, either means (1) or (2) is not practical because it involves energy consumption due to Joule heat (V ² / R) in the additional control path 112. Further, in the means of (1) and (2), the additional control unit 110 itself must have an ability to generate a current equivalent to the current supplied from the power supply path 20 in the first place.

  Therefore, here, a means for winding the additional control path 112 of (3) around the penetrating body of the generator current transformer 14 a plurality of times will be examined. In this way, by winding the additional control path 112 around the penetration body of the generator current transformer 14 a plurality of times, the generator current transformer 14 is controlled by the control current while suppressing energy consumption due to Joule heat. The change width of the received current and the scale of the change width of the current received by the generator current transformer 14 through the power supply path 20 can be matched.

  FIG. 6 is an explanatory diagram for explaining the additional control path 112. The additional control path 112 is wound, for example, five times so as to be inserted into the through hole 14b of the through body 14a of the current transformer 14 for generator. Thus, with respect to the current in the power supply path 20, assuming that the originally required control current is I and the number of turns is N, it is sufficient that the additional control unit 110 can control the current of I / N.

  The number of turns of the additional control path 112 is 5 for convenience of explanation, but it is 3 to 30 times, more preferably 5 to 10 times. Here, the number of windings is set to 3 times or more because if the number of windings is 1 or 2 after all, the current itself flowing through the additional control path 112 becomes large and the consumption of Joule heat cannot be suppressed. is there. In addition, the number of windings is set to 30 or less because if the number of windings exceeds 30, the noise from the outside is amplified by the number of windings and then rides on the control current, so that the control current is easily affected by the noise. .

As a reference, for example, the following three may be considered as causes of noise.
(A) Influence of electromotive force due to electromagnetic induction: If the number of turns is N, the current flowing through the power supply path 20 is I ₀ , and the radius of the penetrating body 14a is r, the additional control path 112 has an electromotive force ΔV = N / 2πr × dI ₀ / dt is induced.
(B) Influence of surge noise due to electromagnetic joining: When the wiring of the power supply path 20 and the wiring of the additional control path 112 are close to each other, the surge noise flowing through the power supply path 20 is transmitted to the additional control path 112 by the electromagnetic contact path. .
(C) Influence of radiated electromagnetic field immunity: Radio waves from amateur radios or mobile phones ride on the additional control path 112.

By the way, although the additional control part 110 has a function which controls a control current, the control precision by a control current may be inferior for the following reasons.
(I) As a voltage source to be applied to the additional control path 112, only a constant voltage source, for example, a commercial 100V can be used.
(Ii) The variable width of the control current of the additional control unit 110 is small in the first place.
(Iii) The resolution of the control current is low in the first place.

  Therefore, in the present embodiment, by making the number of turns or the resistance value of the additional control path 112 variable, it is possible to change the variable width of the control current or change the resolution regardless of whether it is a constant voltage source. .

  FIG. 7 is another explanatory diagram for explaining the additional control path 112. In FIG. 7 (a), the additional control path 112 is wound around the through body 14a five times so that the additional control path 112 is inserted into the through hole 14b of the through body 14a of the generator current transformer 14. . In the variable portion 112a of the additional control path 112, a contact is provided for each turn of the winding, and the number of windings is varied depending on the connection mode of the contact. Further, as shown in FIG. 7B, by providing the additional control path 112 with a variable resistance 112b having a variable resistance value, the resistance value R of the additional control path 112 is changed, and the control current (V / R) is variable. It can also be made. The change of the variable part 112a and the variable resistor 112b may be automatically performed from the additional control unit 110, or may be manually performed according to the power usage mode.

  In this way, by varying the control current independently of the control current variable capability of the additional control unit 110, the control current variable width can be increased, the control current variable capability of the additional control unit 110, the variable portion 112a, etc. It can be expanded to the range multiplied by the variable ability. In addition, since the resolution of the control current of the additional control unit 110 can be varied by the variable portion 112a or the like, it is possible to deal with control that requires resolution.

  As described above, the power supply systems 100 and 200 enable constant control of received power without wasting resources such as the generator current transformer 14 and the generator control unit 16 originally provided in the power generation unit 10. It is possible to appropriately supply power from the power generation unit 10 to the load facility 22.

  Further, the power supply system 200 appropriately supplies power to the load facility 22 from the power generation unit 10 capable of constant control of received power regardless of the state of the load facility 22 and the installation environment of the current transformer 14 for the generator. Is possible.

  As mentioned above, although preferred embodiment of this invention was described referring an accompanying drawing, it cannot be overemphasized that this invention is not limited to this embodiment. It will be apparent to those skilled in the art that various changes and modifications can be made within the scope of the claims, and these are naturally within the technical scope of the present invention. Understood.

  The present invention can be used for a power supply system that supplies power to a load facility from a power generation unit capable of constant control of received power.

DESCRIPTION OF SYMBOLS 10 Power generation unit 12 Generator 14 Current transformer 14a for generator 16 Penetration body 16 Generator control part 20 Power supply path 22 Load equipment 100, 200 Power supply system 110 Additional control part 112 Additional control path 130 Extension current transformer 132 Transmission part 134 Receiver

Claims (4)

A generator connected to a power supply path and a load facility from an electric power company and supplying power to the load facility;
An extension current transformer that is inserted into the power supply path and transforms the current value of the power supply path into a measured value;
A transmitter for transmitting the measurement value transformed by the extension current transformer through a communication line;
A receiving unit for receiving a measurement value from the transmitting unit;
An additional control unit that causes a control current to flow through the additional control path according to the measurement value received by the reception unit;
A current transformer for a generator that transforms the current value of the additional control path into a measured value;
A generator control unit for controlling the output power of the generator so that the measurement value transformed by the generator current transformer becomes a predetermined value;
A power supply system comprising:   2. The power supply system according to claim 1, wherein the additional control path is wound any number of 3 to 30 times around the penetrating body of the generator current transformer. The additional control path is wound around the generator current transformer through 3 to 30 times, any number of times, and a variable part is formed to make the number of turns variable,
The power supply system according to claim 1, wherein the additional control unit controls the control current by changing the number of turns of the variable part. The additional control path is provided with a variable resistor having a variable resistance value,
The power supply system according to claim 1, wherein the additional control unit controls a control current by changing a resistance value of the variable resistor.

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