JP2012121531A - Device and method for controlling inverter for ac feeding - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inverter control device and an inverter control method, for constituting an AC feeding system in which circuit loss is small.SOLUTION: The inverter control device for an AC feeding includes: an estimated load power calculation part for calculating a load power consumption and a load position, based on the schedule diagram information of a load, and absolute time; a current indication value calculation part for calculating a current indication value, based on the load power consumption and the load position that are calculated by the estimated load power calculation part; a current control part for calculating an amplified current difference based on the current indication value, an amplification factor, and an output current detection value for indicating an output current of the inverter; a voltage control part for calculating an indication value adding voltage difference based on an AC voltage detection value for indicating a voltage of an AC feeding circuit and a voltage indication value that is preset; and an output part for outputting an output voltage value to an inverter based on the amplified current difference and the indication value adding voltage difference.

Description

  Embodiments described herein relate generally to an AC feeding inverter control device and a control method.

A conventional AC feeder system will be described with reference to FIG. FIG. 7 is a diagram showing the configuration of an AC feeder system. The AC feeder system consists of generators 1, 1 'and electric transformers 2, 2' and overhead lines 3, 3 ', 3 "
And section 4. The three-phase alternating current generated by the generator 1 is
It is converted into a pair of single-phase alternating currents, and power is supplied to the loads 9 and 9 ′ through the overhead lines 3 and 3 ′. The feeding transformer 2 here is, for example, a Scott winding transformer. The adjacent overhead lines 3 ′ and 3 ″ are divided in the section 4 because of the voltage phase difference.

In recent years, the need for power supply by inverters has increased due to the introduction of natural energy power generation systems and power storage devices. The configuration of an AC feeder system that supplies power using this inverter will be described with reference to FIG.

The AC feeder system shown in FIG. 8 includes a generator 1, an overhead line 3, a converter 5, and a solar power generation system 6.
And the power storage device 7 and inverters 8, 8 ′, 8 ″. The alternating current generated by the generator 1 is converted into direct current by the converter 5, and the inverter 8 converts it into alternating voltage of an arbitrary phase. The direct current generated by the solar power generation system 6 and the direct current discharged from the power storage device 7 are converted into an alternating voltage having an arbitrary phase by the inverters 8 ′ and 8 ″. The electric power converted by the inverters 8, 8 ′, 8 ″ is supplied to the loads 9, 9 ′.

Here, since the inverters 8, 8 ′, 8 ″ can be converted to an AC voltage having an arbitrary phase, it is not necessary to divide the inverters in the section 4 as in the prior art. By sharing the output according to the distance, it is possible to supply power with a small circuit loss.

In general, when power is supplied by multiple inverters, each inverter performs voltage control so as to maintain the voltage of the connected system, and in order to prevent cross current, a preset sharing ratio or equal output is set. Control for correcting the output current or output is performed.

FIG. 9 shows a configuration of a general AC feeding inverter control device 19 when power is supplied by a plurality of inverters. Electric power is supplied to the load 9 from a plurality of inverters 8 and 8 ′. In the control circuit of the inverter 8, a voltage difference ΔV between the AC voltage detection value detected by the voltage detector 10 and the voltage command value Vref is obtained. The voltage control circuit 11 is given. The voltage control circuit 11 performs control so as to reduce the voltage difference ΔV between the AC voltage detection value Vd and the voltage command value Vref, and outputs a signal corresponding to the inverter output voltage, which is a control output, to the output circuit 15.

On the other hand, in order to prevent cross current with the inverter 8 'operating in parallel, the current detectors 12, 12
The output currents of the inverter 8 and the inverter 8 ′ are detected by “and supplied to the current command value calculation circuit 13. In the current command value calculation circuit 13, for example, a value obtained by multiplying the total value of the output current detection values Id detected by the inverter 8 and the inverter 8 ′ by a preset ratio is output as the current command value Iref.

The current control circuit 14 controls the current difference ΔI between the current command value Iref and the output current detected by the current detector 12 to be small, and outputs the control output to the output circuit 15 as a correction signal for the voltage control. The output circuit 15 adds the signal corresponding to the inverter output voltage output from the voltage control circuit 11 and the correction signal output from the current control circuit 14 and outputs the result to the pulse generation circuit 16 as an output voltage value Vc.

The pulse generation circuit 16 generates a switching pulse signal and supplies it to the inverter 8 so that the output voltage generated by the inverter 8 becomes Vc output from the output circuit 15. The same control is also performed in the inverter 8 'that operates in parallel. By performing this control, it is possible to supply power to the load 9 while maintaining the output ratio of the inverters 8 and 8 ′ constant while maintaining the voltage of the AC system at the command value Vref.

However, when this method is applied to an AC feeder circuit, since the sharing ratio is constant, appropriate sharing that can reduce the circuit loss such that an inverter near the load outputs many outputs cannot be performed. In addition, as a method of supplying power to the AC feeder system with multiple inverters, a method has been proposed in which the inverter can be installed at the place where the inverter is installed and the current in the electrical circuit is detected and output according to its magnitude. It is difficult to apply when the configuration changes.

On the other hand, the AC feeder system has a feature that a load (train) travels on the basis of a diagram as compared with a general power system, so that changes in load amount and load position can be accurately predicted.

Patent No. 4400442

The problem to be solved by the embodiments of the present invention is to provide an AC feeding inverter control device and a control method capable of constituting an AC feeding system with a small circuit loss.

An inverter control apparatus for AC feeding according to an embodiment of the present invention includes an estimated load power calculation unit that calculates load power consumption and a load position based on scheduled schedule information and absolute time of a load, and the estimated load power calculation unit. A current command value calculation unit that calculates a current command value based on the calculated load power consumption and load position is provided.

Furthermore, based on the current command value, the amplification factor, and the output current detection value indicating the output current of the inverter, a current control unit that calculates the amplified current difference, an AC voltage detection value that indicates the voltage of the AC feeder circuit, and the advance A voltage control unit that calculates a command value addition voltage difference based on the voltage command value set in the output, and an output unit that outputs an output voltage value to the inverter based on the amplified current difference and the command value addition voltage difference And comprising.

The block diagram which shows the structure of the inverter control apparatus for AC feeding in 1st Embodiment. The figure which shows the structure of the AC feeder system with which load was connected. The figure which shows the voltage and electric current characteristic of an inverter at the time of applying the inverter control apparatus for alternating current feeding in 1st Embodiment. The block diagram which shows the structure of the inverter control apparatus for alternating current feeding in 2nd Embodiment. The block diagram which shows the structure of the inverter control apparatus for AC feeding in 3rd Embodiment. The block diagram which shows the structure of the inverter control apparatus for AC feeding in 4th Embodiment. The figure which shows the structure of the conventional AC feeder system. The figure which shows the structure of the conventional alternating current feeding system which supplies electric power to load using an inverter. The figure which shows the structure of the general control system in the case of supplying electric power with a several inverter.

An AC feeding inverter control apparatus according to an embodiment of the present invention will be described with reference to the drawings.

(First embodiment)
The configuration and operation of the AC feeding inverter control apparatus according to the first embodiment will be described with reference to FIG. FIG. 1 is a block diagram illustrating a configuration of an AC feeding inverter control device 19 according to the present embodiment. In the above-described conventional AC feeding inverter control device 19 shown in FIG. 9, the current command value Iref is calculated using the output current detection value of the inverter, whereas the AC feeding inverter of this embodiment is used. In the control device 19, the estimated load power calculation circuit 17 calculates the power command value Iref based on the load power information and the load position information.

The AC feeding inverter control device 19 of the present embodiment receives the output current detection value Id and the AC voltage detection value Vd, and outputs the output voltage value Vc to the inverter 8. The output current detection value Id is a value obtained by detecting an output current output from the inverter with a current detector (not shown).
The AC voltage detection value Vd is a value obtained by detecting the voltage of the AC feeding system with a voltage detector (not shown).

Next, each configuration of the AC feeding inverter control device 19 shown in FIG. 1 will be described. The inverter control apparatus for AC feeding according to this embodiment includes a scheduled diamond information storage unit 26, an internal clock 27,
Estimated load power calculation circuit 17, current command value calculation circuit 13, subtractor 28, current control circuit 14,
An amplification factor calculation circuit 18, a subtractor 29, a voltage control circuit 11, and an output circuit 15 are provided.

The scheduled diamond information storage unit 26 includes, for example, a built-in memory such as a hard disk and an SSD,
It is an external memory such as an SB memory or an SD card, stores schedule diagram information of a load supplied with power from an AC feeder system, and outputs schedule diagram information to the estimated load power calculation circuit 17. Here, the schedule diagram information indicates a diagram set in advance, and is the position and speed of each load at an arbitrary time.

The internal clock 27 holds the current absolute time and outputs the absolute time to the estimated load power calculation circuit 17.

The estimated load power calculation circuit 17 calculates the load power consumption indicating the power consumption of each load and the AC power supply system of each load from the schedule diagram information received from the schedule diagram information storage unit 26 and the absolute time received from the internal clock 27. The load position indicating the position at is calculated. Further, the load power consumption and the load position are output to the current command value calculation circuit 13 and the amplification factor calculation circuit 18.

The current command value calculation circuit 13 calculates a current command value Iref indicating a current value to be output by the inverter 8 from the load power consumption and the load position received from the estimated load power calculation circuit 17 and outputs them to the subtracter 28. .

The subtracter 28 subtracts the current command value Iref received from the current command value calculation circuit 13 and the output current detection value Id received from a current detector (not shown), and a current difference Δ indicating the subtraction result.
I is output to the current control circuit 14.

The amplification factor calculation circuit 18 calculates the amplification factor K from the load power consumption and the load position received from the estimated load power calculation circuit 17 and outputs them to the current control circuit 14.

The current control circuit 14 calculates a signal such that the current difference ΔI received from the subtractor 28 approaches zero, further multiplies the amplification factor K received from the amplification factor calculation circuit 18, and outputs the multiplication result to the output circuit 15. Output.

The subtractor 29 subtracts a voltage command value Vref indicating a preset voltage and an AC voltage detection value Vd received from a voltage detection circuit (not shown), and a voltage difference ΔV indicating the subtraction result is supplied to the voltage control circuit 11. Output.

The voltage control circuit 11 calculates a signal such that the voltage difference Δ received from the subtractor 29 approaches zero, adds the voltage command value Vref, and outputs the addition result to the output circuit 15.

The output circuit 15 adds the signal received from the voltage control circuit 11 and the signal received from the current control circuit 14, and outputs an output voltage value Vc indicating the addition result to the inverter 8.

Next, a method for calculating the current command value Iref of the current command value calculation circuit 13 will be described with reference to FIG. FIG. 2 is a configuration diagram showing an AC feeder system to which a load is connected. Inverter 8,
The output current output from 8 'is supplied to the loads 9, 9' through the overhead wire 3. Here, the distance between the load 9 and the inverter 8 is A, the distance between the load 9 and the inverter 8 ′ is B, the distance between the load 9 ′ and the inverter 8 is C, and the distance between the load 9 ′ and the inverter 8 ′ is D. It is said.

The current value I89 output from the inverter 8 to the load 9 and the current value I89 ′ output from the inverter 8 to the load 9 ′ are load consumption currents I9 and I9 ′ of the loads 9 and 9 ′, respectively.
Are expressed by the formulas (1) and (2). The load current consumptions I9 and I9 ′ are values corresponding to the load power consumptions P9 and P9 ′ calculated by the estimated load power calculation circuit 17, respectively.

I89 = I9 × (B / A + B) (1) Formula I89 ′ = I9 ′ × (D / C + D) (2) That is, the sum of the output current values of the inverter 8 (I89 + I89 ′). Current command value I
ref8 is expressed by equation (3).

Iref8 = I9 × (B / A + B) + I9 ′ × (D / C + D) (3) Similarly, the current value I8′9 output from the inverter 8 ′ to the load 9 and the load from the inverter 8 ′ The current value I8′9 ′ output to 9 ′ is expressed by the equations (4) and (5) using the load power consumption P9 of the load 9, and the current command value Iref of the inverter 8 ′.
8 'is represented by the formula (6).

I8′9 = I9 × (A / A + B) (4) Formula I8′9 ′ = I9 ′ × (C / C + D) (5) Formula Iref8 ′ = I9 × (A / A + B) + I9 ′ × (C / C + D) (6) Here, the load current consumption I9 of the load 9 is supplied from both the inverters 8 and 8 ′.
The inverter 8 that is close to the load 9 may supply the load consumption current I9. In this case, the current command value Iref8 is expressed by the equation (7). Similarly, when the inverter 8 ′ supplies the load current consumption I9 ′ of the load 9 ′, the current command value Iref8 ′ is expressed by the equation (8).

Iref8 = I9 (7) Expression Iref8 ′ = I9 ′ (8) Next, the amplification factor K calculated by the amplification factor calculation circuit 18 will be described. The actual load power consumption and load position may differ from the load power consumption and load position calculated by the estimated load power calculation circuit 17. In such a case, the amplification factor calculation circuit 18 sets the amplification factor K to “
It changes according to load power consumption or load position.

At this time, a method of calculating the amplification factor K will be described with reference to FIG. FIG. 3 is a diagram showing the voltage / current characteristics of the inverter when the AC feeding inverter control device 19 of the present embodiment is applied. The vertical axis represents the voltage value in the AC feeder system, and the horizontal axis represents the output current value of each inverter. In (a), the actual load power consumption is an estimated value Pref (Pref = Iref × Vref).
When it is smaller than f), (b) shows a case where the actual load power consumption is larger than the estimated value Pref.

As shown in FIG. 3A, when the actual load power consumption is smaller than the estimated value Pref, the output of the inverter 8 is an operation with a current value smaller than the current command value Iref and a voltage value larger than the voltage command value Vref. It is operated at a point (V operation value). The slope of the straight line at this time is the amplification factor K. By changing the amplification factor K, the difference between the current command value Iref and the actual load current consumption value I1 is changed.

That is, when the amplification factor K is small, the inclination becomes small, and the current command value Iref and the operating current value I1.
And the difference becomes larger. On the contrary, when the amplification factor K is large, the inclination becomes large, and the difference between the current command value Iref and the operating current value I1 becomes small. That is, when the amplification factor K is small, the ratio of the difference between the actual load power consumption and the estimated value Pref is increased in the inverter 8 (the difference is supplied by the inverter 8). The ratio of accommodating other inverters other than the inverter 8 increases.

Similarly, when the actual load power consumption is larger than the estimated value Pref as shown in FIG. 3B, if the amplification factor K is small, the difference between the actual load power consumption and the estimated value Pref is determined by the inverter 8. When the rate of accommodation increases and the amplification factor K is large, the rate at which the difference is accommodated by other inverters than the inverter 8 increases.

Here, for example, in the case of an inverter with a large load of power in the vicinity, a value close to the command value is output as much as possible, and control is performed so that the error is absorbed by a distant inverter, and there is a margin for the capacity of the inverter. When the error is absorbed by an inverter with
By changing the slope of the voltage / current characteristics (amplification factor K) according to the load position, the power transmission loss is reduced and it is easy to prevent the inverter from overcurrent.

In the AC feeder system to which a plurality of inverters are connected, the effect of controlling the inverter 8 by the aforementioned AC feeder inverter control device 19 will be described.

By changing the current command value Iref by the current command value calculation circuit 13 according to the load power consumption and the load position calculated by the estimated load power calculation circuit 17, the power supplied to the load is supplied from the inverter 8. It is possible to determine the proportion of power.

Further, by changing the amplification factor K by the amplification factor calculation circuit 18 in accordance with the load power consumption and the load position calculated by the estimated load power calculation circuit 17, the power difference between the actual load power consumption and the estimated value can be changed. It is possible to determine which inverter has more flexibility.

(Second Embodiment)
The configuration of the AC feeder inverter control device 19 in the second embodiment will be described with reference to FIG. FIG. 4 is a block diagram showing the configuration of the AC feeding inverter control device 19. 4 differs from the first embodiment shown in FIG. 1 in that the scheduled diagram information storage unit 26, the internal clock 27, the estimated load power calculation circuit 17, and the current command value calculation circuit 13 are different.
, And the amplification factor calculation circuit 18 is provided in the common control device 20 connected to the AC feeding inverter control device 19 through a transmission line.

Further, each inverter current command value computing circuit 21 and each inverter amplification factor computing circuit 22 are provided instead of the current command value computing circuit 13 and the amplification factor computing circuit 18 of the common control device 20.

Each inverter current command value calculation circuit 21 performs first AC feeding inverter control device 19 and second AC feeding inverter control based on the load power consumption and the load position received from the estimated load power calculation circuit 17. The current command values Iref1 to Iref2 are respectively supplied to the device 19 ′.
Is calculated and output. Here, the calculation method of the current command values Iref1 to Iref2 is the same as the method shown in the first embodiment, and is calculated for each inverter.

Based on the load power consumption and the load position received from the estimated load power calculation circuit 17, each inverter amplification factor calculation circuit 22 has a first AC feeding inverter control device 19 and a second AC feeding inverter control device. For 19 ′, the amplification factors K1 and K2 are calculated and output, respectively. Here, the calculation method of the amplification factor K is the same as the method shown in the first embodiment, and is calculated for each inverter.

The subtractor 28 and current controller 14 of the first AC feeder inverter controller 19 are respectively
The current command value Iref1 output from each inverter current command value calculation circuit 21 and the amplification factor K1 output from each inverter amplification factor calculation circuit 22 are received. Since the subsequent steps are the same as those in the first embodiment, description thereof is omitted.

The second AC feeding inverter control device 19 ′ has the same configuration as the first AC feeding inverter control device 19 and receives the current command value Iref2 and the amplification factor K2. After that, since it is the same as that of the 1st AC feeding inverter control apparatus 19, description is abbreviate | omitted.

According to this embodiment, in addition to the effects of the first embodiment, when controlling an inverter using a plurality of AC feeding inverter control devices, a current command value calculation circuit for calculating a current command value and an amplification factor are provided. There is no need to provide a plurality of amplification factor calculation circuits for calculation.

Further, the current command values Iref1 to Ir to be output to a plurality of AC feeding inverter control devices.
Since ef2 and amplification factors K1 to K2 are calculated by the common control device 20, collective management is possible.

(Third embodiment)
The AC feeding inverter control device 19 in the third embodiment is calculated with reference to FIG. FIG. 5 is a block diagram showing the configuration of the AC feeding inverter control device 19. FIG.
1 is different from the first embodiment shown in FIG. 1 in that a load power consumption correction circuit 23 is provided.

The load power consumption correction circuit 23 is a central management system 30 that manages the position and speed of the load.
Current load information indicating the position and speed of the load is received, and the current diamond information is compared with the scheduled diamond information. Further, based on the comparison result, the load power consumption and the load position received from the estimated load power calculation circuit 17 are corrected, and the corrected load power consumption and the corrected load position are output to the current command value calculation circuit 13 and the amplification factor calculation circuit 18. To do.

The current command value calculation circuit 13 calculates a current command value Iref indicating a current value to be output by the inverter 8 from the corrected load power consumption received from the load power correction circuit 23 and the corrected load position. Output. Since the subsequent steps are the same as those in the first embodiment, description thereof is omitted.

The amplification factor calculation circuit 18 calculates the amplification factor K from the corrected load power consumption received from the load power consumption correction circuit 23 and the corrected load position, and outputs it to the current control circuit 14. Since the subsequent steps are the same as those in the first embodiment, description thereof is omitted.

According to the present embodiment, in addition to the effects of the first embodiment, when the actual diagram is disturbed, such as when a delay from the scheduled diagram information occurs, correction can be performed, and a more accurate inverter Control can be performed.

(Fourth embodiment)
The configuration of the AC feeder inverter control device 19 in the fourth embodiment will be described with reference to FIG. FIG. 6 is a block diagram showing the configuration of the AC feeding inverter control device 19. 6 is different from the first embodiment shown in FIG. 1 in that a current command value correction circuit 24 and an amplification factor correction circuit 25 are provided.

The current command value correction circuit 24 receives operation information such as an output current value from the inverter 8 ′ that operates in parallel, and corrects the current command value Iref received from the operation command value calculation circuit 13. The corrected corrected current command value is calculated and output to the adder 28. Since the subsequent steps are the same as those in the first embodiment, description thereof is omitted.

A method for calculating the corrected current command value will be described. For example, when the inverter 8 ′ stops, the current supplied by the inverter 8 ′ is added to the current command value Iref and output as a corrected current command value. Further, when the generator connected to the inverter 8 ′ cannot arbitrarily adjust the output of the photovoltaic power generation system or the like, the corrected current is added to the current command value Iref by the reduced output when the output of the generator decreases. It is also possible to output as a command value.

The amplification factor correction circuit 25 receives the operation information from the inverter 8 ′ operating in parallel and corrects the amplification factor K received from the amplification factor calculation circuit 18. The corrected correction amplification factor is calculated and output to the current control circuit 14. Since the subsequent steps are the same as those in the first embodiment, description thereof is omitted.

A method for determining the correction amplification factor will be described. For example, when the output of the inverter 8 ′ is close to the maximum capacity, the inverter 8 can accommodate the difference between the actual load power consumption and the estimated amount Pref by lowering the correction amplification factor.

According to the present embodiment, in addition to the effects of the first embodiment, by including the current command value correction circuit 24 and the amplification factor correction circuit 25 that receive the operation information received from the inverter 8 ′,
It is possible to determine the output voltage value Vc of the inverter 8 in consideration of the operation information of the inverter 8 ′.

According to the embodiment of the present invention, it is possible to provide an AC feeding inverter control device and a control method capable of constituting an AC feeding system with a small circuit loss.

As mentioned above, although some embodiment of this invention was described, these embodiment was shown as an example and is not intending limiting the range of invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and their variations are
It is included in the scope and gist of the invention, and is included in the invention described in the claims and the equivalent scope thereof.

DESCRIPTION OF SYMBOLS 1, 1 '... Generator 2, 2' ... Feeding transformer 3, 3 ', 3 "... Overhead wire 4 ... Section 5 ... Converter 6 ... Solar power generation system 7 ... Power storage device 8, 8', 8" ... Inverter 9, 9 '... load 10 ... voltage detector 11 ... voltage control circuit 12 ... current detector 13 ... current command value calculation circuit 14 ... current control circuit 15 ... output circuit 16 ... pulse generation circuit 17 ... estimated load power calculation circuit 18 ... Amplification factor calculation circuits 19, 19 '... AC feeding inverter control device 20 ... Common control device 21 ... Each inverter current command value calculation circuit 22 ... Each inverter amplification factor calculation circuit 23 ... Load power consumption correction circuit 24 ... Current command Value correction circuit 25 ... Amplification factor correction circuit 26 ... Schedule diagram information storage unit 27 ... Internal clock 28, 29 ... Subtractor 30 ... Central management system

Claims (8)

An estimated load power calculator that calculates load power consumption and load position based on the scheduled schedule information and absolute time of the load;
A current command value calculation unit that calculates a current command value based on the load power consumption and the load position calculated by the estimated load power calculation unit;
Based on the current command value, the amplification factor, and the output current detection value indicating the output current of the inverter,
A current control unit for calculating an amplified current difference;
A voltage control unit that calculates a command value addition voltage difference based on an AC voltage detection value indicating a voltage of the AC feeding circuit and a voltage command value set in advance;
An output unit that outputs an output voltage value to an inverter based on the amplified current difference and the command value addition voltage difference;
An inverter control device for AC feeding. An amplification factor calculation unit that calculates the amplification factor based on the load power consumption and the load position,
The AC feeding inverter control device according to claim 1, wherein the current control unit detects an amplified current difference based on the amplification factor calculated by the amplification factor calculation unit, the current command value, and the output current detection value. . In the inverter control device for AC power feeding connected to the common control device that calculates the load power consumption and load position of the inverter based on the scheduled schedule information of the load and the absolute time,
A current control unit that calculates an amplified current difference based on a current command value and an amplification factor calculated by the common control device and an output current detection value indicating an output current of the inverter;
A voltage control unit that calculates a command value addition voltage difference based on an AC voltage detection value indicating a voltage of the AC feeding circuit and a voltage command value set in advance;
An output unit that outputs an output voltage value to an inverter based on the amplified current difference and the command value addition voltage difference;
An inverter control device for AC feeding. A load power correction unit that calculates a corrected load power consumption and a corrected load position based on the current diagram information and schedule diagram information of the load and the load power consumption and the load position calculated by the estimated load power calculation unit;
The AC feeding inverter control device according to claim 1, wherein the current command value calculation unit calculates a current command value based on the corrected load power consumption and the corrected load position. A load power correction unit that calculates a corrected load power consumption and a corrected load position based on the current diagram information and schedule diagram information of the load and the load power consumption and the load position calculated by the estimated load power calculation unit;
The AC feeding inverter control device according to claim 2, wherein the amplification factor calculation unit calculates an amplification factor based on the corrected load power consumption and the corrected load position. Based on the operation information of the connected inverter and the current command value calculated by the current command value calculation unit, a current command value correction unit that calculates a corrected current command value;
An amplification factor correction circuit that calculates a correction amplification factor based on the operation information of the connected inverter and the amplification factor calculated by the amplification factor calculator,
6. The AC feeding inverter according to claim 1, wherein the current control circuit calculates an amplified current difference based on the corrected current command value, the corrected amplification factor, and the output current detection value. Control device. Estimated load power calculation step for calculating load power consumption and load position based on schedule schedule information and absolute time of load;
A current command value calculation step for calculating a current command value based on the load power consumption and the load position calculated in the estimated load power calculation step;
Based on the current command value, the amplification factor, and the output current detection value indicating the output current of the inverter,
A current control step for calculating an amplified current difference;
A voltage control step for calculating a command value addition voltage difference based on an AC voltage detection value indicating a voltage of the AC feeding circuit and a preset voltage command value;
An output step of outputting an output voltage value to an inverter based on the amplified current difference and the command value addition voltage difference;
An AC feeder inverter control method comprising: An amplification factor calculation step for calculating the amplification factor based on the load power consumption and the load position,
8. The AC feeding inverter control method according to claim 7, wherein the current control step detects an amplified current difference based on the amplification factor calculated in the amplification factor calculation step, the current command value, and the output current detection value. .

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