JPH07170761A - Regenerative-control power inverter - Google Patents

Abstract

PURPOSE:To equalize a regenerative power share by inverting the power of a DC side system into the AC power of a corresponding current value on the basis of volt-ampere conversion characteristics, in which voltage corresponding to the difference of detecting voltage and a set value is adjusted, when the voltage of the DC side system is detected and exceeds a starting point. CONSTITUTION:The voltage of a DC bus 11 is divided by voltage divider resistors 15, 16, and input to an AVR controller (AV) 23A. The AV 23A inputs the difference between a voltage divider output and the voltage reference value of a voltage reference setter 20 to an amplifier circuit 18. An output from the amplifier circuit 18 is input to an EC-alpha conversion gate signal generator 19 as a control signal, and transmitted to a power inverter 12. A current value fed to an AC system 14 is detected by an AC machine 21, and converted into voltage corresponding to a detected current value by a current-voltage converter and transmitted over a VI characteristic gradient regulator (VI) 22, and voltage corresponding to a current value supplied to a current transformation system gives attenuation corresponding to a set resistance value and input to the amplifier circuit 18. The amplifier circuit 18 amplifies and outputs a signal obtained by adding the voltage signal of the VI 22 to the control signal.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a regenerative control reverse conversion device for electric railways or the like, which regenerates DC power from a DC feeder to an AC system.

[0002]

2. Description of the Related Art In electric trains and locomotives powered by a DC motor (hereinafter referred to as "trains"), the DC motor can be used as a generator, and the kinetic energy of the train is converted into electric power by operating as a generator. By converting to, it can be used for deceleration of trains and the like.

By the way, with the recent progress of semiconductor technology, from the viewpoint of effective use of energy, for example, kinetic energy at the time of train braking is sent back from the DC system to the AC system.
So-called electric power regeneration control, which is used as electric power, has come to be used in various fields.

Generally, this control system performs constant voltage control of the DC side voltage (hereinafter referred to as AVR control) using the DC side voltage as control feedback, and regenerative operation is performed by increasing the number of trains operating. According to the increase in regenerative power accompanying the increase in braking, there is adopted a method of converting the surplus power on the DC system side to the AC system.

FIG. 3 is a single line connection diagram showing an example of the configuration of a conventional system for performing such power conversion. In the figure, 10 is a train (train or electric locomotive), 11 is a DC bus,
In the case of a railway that supplies power from an overhead line (trolley line), it corresponds to an overhead line and a track. Reference numeral 12 is an inverse conversion device using a thyristor bridge circuit, which performs switching control of the DC power from the DC bus 11 and converts it into AC power of a predetermined frequency for output. Reference numeral 13 is a transformer that transforms the AC power that is the conversion output of the inverse conversion device 12, and the AC power transformed by this transformer 13 is supplied to the AC grid 14.

Reference numerals 15 and 16 denote voltage dividing resistors, which are connected in series and are connected between the DC bus lines 11 to divide the DC bus line voltage, and the divided voltage output is used as a feedback voltage. An AVR control device (constant voltage control device) 23 controls the output voltage of the inverse conversion device 12 to be constant according to the voltage between the DC buses 11, and includes a limiter circuit 17 and an amplification circuit 18. , EC-α
It is composed of a conversion gate signal generator 19 and a voltage reference setting device 20.

Of these, the limiter circuit 17 is a setting device for adjusting the limit range of the control signal, that is, the upper limit range and the lower limit range. In addition, the voltage reference setting device 20
Is for setting and giving a reference voltage, and the amplifier circuit 18
Is a signal amplifier circuit, and is an algebraic addition value of the reference voltage of the voltage reference setter 20 and the divided voltage of the voltage dividing resistors 15 and 16 (here, the divided voltage with respect to the reference voltage given from the voltage reference setter 20. The voltage difference value) is used as a signal input and is amplified and output.

The EC-α conversion gate signal generator 19 is a circuit for converting the control signal output from the amplifier circuit 18 into a gate signal, and performs gate control of the thyristor of the inverse conversion device 12 according to the level of the control signal, and the inverse The conversion output of the conversion device 12 is set to have a predetermined frequency and a predetermined voltage.

In the system having such a configuration, the regenerative output generated by the regenerative braking of the train 10 is the DC bus 1
It is returned to 1, the load on the DC bus 11 is reduced, and the voltage rises accordingly.

The voltage of the DC bus 11 is divided by the voltage dividing resistors 15 and 1.
The voltage is divided by 6 and input to the AVR control device 23.
The AVR control device 23 obtains the difference between the divided voltage output and the reference value from the voltage reference setting device 20, and the difference is amplified.
Is input to the amplifier circuit 18, an amplified output corresponding to the input is obtained from the amplifier circuit 18. The amplified output is EC as a control signal.
It is input to the -α conversion gate signal generator 19, converted into a gate signal corresponding to the level of the control signal, and given to the inverse conversion device 12 as a gate signal for the thyristor bridge of the inverse conversion device 12. The reverse converter 12 converts the DC voltage of the DC bus 11 into an AC voltage of a voltage level corresponding to the gate signal and of a predetermined frequency, and outputs the AC voltage to the transformer 13. Then, after being transformed by the transformer 13, the AC system 14 is supplied with power.

In the AVR controller 23, the limiter circuit 17 is connected to the EC-α conversion gate signal generator 19 to set the upper limit value and the lower limit value of the control signal to be converted into the gate signal, and the control signal is the upper limit value. When the level is within the range of the lower limit value, the gate signal corresponding to the level of the control signal is output, and when the level exceeds the upper limit value, the gate signal of the level of the upper limit value is output.

The control signal is the voltage reference setting unit 2
Based on the reference voltage given by 0, the voltage dividing resistor 1
5, a thyristor of the inverse conversion device 12 so that the output AC power of the inverse conversion device 12 corresponds to the level of this control signal. Since it is used to control the conduction angle of the bridge circuit, the voltage reference from the voltage reference setting device 20 is set to correspond to the lower limit voltage value when excess power is generated in the DC system. At the stage where the DC voltage rises by the amount of surplus power corresponding to the regenerative power generated by the regenerative control of the train and reaches the lower limit voltage value, the voltage difference between the DC bus lines 11 with respect to the set voltage reference is determined. It becomes possible to inversely convert the electric power corresponding to the electric energy into an alternating current having a predetermined frequency. That is, the DC power corresponding to the surplus power can be converted into AC power.

Further, the voltage of the DC system is the voltage reference setter 2
When it is lower than the lower limit value determined by the set value of 0, the inverse conversion operation can be stopped and the power regeneration control can be stopped. In this way, when the DC system has surplus power due to the regenerative control output from the train 10, this surplus power can be inversely converted into AC power and supplied to the AC system, so that the AC system uses the DC system. This surplus power can be utilized. The surplus power generated by the regenerative control output from the train 10 fluctuates depending on the train operation status, so it is anxious as a sufficient stable power supply source, but supplements power for lighting in the railway yard, escalators, air conditioning equipment, etc. It is epoch-making in that it can be sufficiently used for the above-mentioned application, and above all, the surplus electric power by the regenerative control that has been wasted can be effectively used and that it is clean energy.

[0014]

As described above, the regenerative control reverse conversion device capable of converting the surplus power on the DC system side to the AC system and supplying the power can effectively use the power. As the effectiveness of this regenerative control inverse converter has been recognized, the number of installed units has recently increased.

However, in the case where a regenerative control reverse conversion device is added to the same DC system and a plurality of units are operated, the regenerative control reverse conversion device already installed and the regenerative control reverse conversion device to be added are added at the time of expansion. If the sharing of the regenerative power amount with the conversion device is not balanced, the regenerative power amount will be concentrated in either the existing or added regenerative control inverse conversion device, and the effect of the additional regenerative control inverse conversion device, that is, This means that the amount of regenerative power cannot be increased sufficiently.

That is, the regenerative control inverse conversion device has different regenerative control characteristics (VI characteristics (V indicates voltage and I indicates current)), and if these remain inconsistent, regenerative control is performed. An imbalance occurs in the effective regenerative power sharing of the inverse converter.

FIG. 4 shows an example of the regenerative control characteristic (VI characteristic) of the regenerative control inverse conversion device. A is a VI characteristic of the first regenerative control inverse converter, and B is a VI characteristic of the second regenerative control inverse converter. a1 is the voltage at the reverse conversion start point of the former and b1 is the voltage at the reverse conversion start point of the latter, and when the voltage of the DC bus becomes a voltage value equal to or higher than the voltage value of the reverse conversion start point,
-I Perform conversion according to the characteristic curve.

When the amount of electric power generated in the DC system increases due to train regeneration control and the surplus electric power increases, the DC bus 11
Becomes higher and the voltage of the DC bus 11 becomes higher, the current value of the inverse conversion output also increases, so that the amount of electric power that is inversely converted to alternating current increases. The slope of the VI characteristic curve to be determined differs depending on the device, and a device showing a characteristic of A having a small slope can obtain a larger regenerative electric energy than a device showing a characteristic of B having a large slope even with the same input voltage value. You can do it. Therefore, the device showing the characteristic of A is efficient, but the device showing the characteristic of B is inefficient.

The voltage value of the reverse conversion starting point can be set by the set value of the limiter circuit, but as in this example, the slope of the VI characteristic curve is usually different depending on the regenerative control reverse conversion device. Even if multiple regenerative control inverse converters are installed and operated, each will have an operating condition corresponding to its own VI characteristics, so the amount of power that can be converted will be uneven, and the regenerative power share will be unbalanced. .

Therefore, an object of the present invention is to provide a regenerative control reverse conversion device capable of equalizing the regenerative electric power sharing even when a plurality of units are installed and operated in the same DC system. .

[0021]

In order to achieve the above object, the present invention is configured as follows. That is, firstly, the power of the DC side system is controlled by controlling the inverse conversion device so as to have a predetermined voltage-current conversion characteristic relationship, and is converted into AC power according to the voltage of the DC side system to be converted into the AC side system. As a device for supplying power, first detecting means for detecting the voltage of the DC side system, voltage-current conversion characteristic adjusting means for adjusting the voltage-current conversion characteristic to a desired characteristic, and start of the AC conversion A start point setting means for setting a voltage value to be a point, and a detection voltage of the first detection means and a preset desired set value when the detection voltage by the first detection means exceeds the start point. A control means for obtaining a voltage corresponding to the difference and controlling the inverse conversion device so as to inversely convert the power of the DC side system into the AC power of the corresponding current value based on the adjusted voltage-current conversion characteristic. It was configured with.

Secondly, as an apparatus for inversely converting the electric power of the DC side system into the AC power by the inverse conversion circuit and feeding the AC side system, a gate controlled switching circuit is provided, and the electric power of the DC side system is supplied. Of the reverse conversion means, a first setting means for generating a desired voltage reference, a first detection means for detecting the voltage of the DC side system, and a reverse conversion means. Current detection means for detecting the converted output current value, correction means for performing a desired correction set in advance on the detected current value to obtain a tilt correction amount, detection voltage of the first detection means, and the voltage reference. Of the difference signal, the inclination correction amount is corrected to the difference signal, and the control amount acquisition means for obtaining the control amount, and the gate signal which becomes the current value output corresponding to the control amount are generated and given to the inverse conversion means. And a gate signal generating means Configuration was. Further, a second setting means for generating an adjustment voltage for determining the voltage value on the DC side at the reverse conversion start point is provided, and the generated adjustment voltage is given to the control amount acquisition means to generate a difference signal from the voltage reference. The adjustment voltage is applied so that the reverse conversion start voltage can be adjusted.

[0023]

In the first structure, the voltage value which is the starting point of the AC conversion is set, and the voltage of the DC side system is detected by the first detecting means, which exceeds the starting point. At this time, the control means obtains a voltage corresponding to the difference between the detection voltage of the first detection means and a preset desired setting value, and based on the adjusted voltage-current conversion characteristic, the corresponding current value is obtained. The reverse conversion device is controlled so as to reversely convert the power of the DC side system into the AC power of.

The voltage-current conversion characteristic can be adjusted to a desired characteristic by a voltage-current conversion characteristic adjusting means,
Further, since the starting point voltage for converting the DC system power into the AC power can be set arbitrarily, the DC system power can be converted into the AC power based on the desired voltage-current conversion characteristic from the desired starting point voltage. it can. Therefore, even when multiple units of this device are installed in the same DC system, it becomes possible to match the voltage-current conversion characteristics of each other and the starting point voltage for converting the DC system power to AC power. Thus, a regenerative control inverse conversion device can be obtained that can evenly share the regenerative power even if a plurality of units are installed and operated in the same DC system.

Further, in the case of the second configuration, as the inverse conversion means, one having a switching circuit which is gate-controlled and which inversely converts the power of the DC side system into the AC power is used, and the gate control is controlled. The quantity acquisition means obtains a difference signal between the detection voltage of the first detection means and the voltage reference, corrects the correction amount to the difference signal, obtains a control quantity, and supplies this to the gate signal generation means. Then, a gate signal which becomes a current value output corresponding to the control amount is generated and given to the inverse conversion means, so that the power of the DC system is converted into AC power.

The correction amount is obtained by performing a desired correction set in advance by the correction means on the converted output current value of the inverse conversion means detected by the current detection means. That is, the conversion characteristic of the AC power amount at the time of the reverse conversion is adjusted to the desired characteristic.

Further, a second setting means is provided for generating an adjustment voltage for determining the DC voltage value at the reverse conversion start point, and the generated adjustment voltage is given to the control amount acquisition means to obtain the reference voltage. The adjustment voltage is added to the difference signal so that the reverse conversion start voltage can be adjusted. Therefore, since the starting point voltage for converting the power of the DC system into the AC power can be arbitrarily set, the desired starting point voltage can be converted into the amount of electric power according to the desired characteristic, and the same DC When installing multiple units of this device in the system,
It becomes possible to match the voltage-current conversion characteristics of each other and the starting point voltage for converting the power of the DC system to the AC power, so that even if multiple units are installed in the same DC system, the regenerative power is shared evenly. A regenerative control inversion device is obtained.

[0028]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention has a constant voltage control function for maintaining a voltage value of a DC side system at a constant voltage in a regenerative control reverse conversion device for inversely converting power of a DC side system into AC power and feeding the AC side system. Inverter side output current is taken in as a control feedback element, and when multiple regenerative control inverse converters are connected to the same DC line, control is performed so that the regenerative control inverters share the regenerative current evenly. The present invention is characterized in that the characteristics can be finely adjusted, and one embodiment of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a system configuration diagram showing an embodiment of the regenerative control inverse conversion device according to the present invention, and FIG. 2 is a single wire connection showing an embodiment of the AVR control device portion of the regenerative control inverse conversion device according to the present invention. It is a figure.

In FIGS. 1 and 2, 10 is a train (train or electric locomotive), 11 is a DC bus, and in the case of a railway that supplies electric power from an overhead line (trolley line), it corresponds to an overhead line and a track. . Reference numeral 12 is an inverse conversion device using a thyristor bridge circuit, which performs switching control of the DC power from the DC bus 11 and converts it into AC power of a predetermined frequency for output. Reference numeral 13 is a transformer that transforms the AC power that is the conversion output of the inverse conversion device 12.
The AC power transformed by 3 is supplied to the AC system 14. Reference numeral 21 denotes a current transformer, which transforms the transformer 13 to the AC system 14
Is a device that detects an AC regenerative current value supplied to the device and generates a detection output corresponding to the current value.

Numerals 15 and 16 are voltage dividing resistors, which are connected in series and are connected between the DC bus lines 11 to divide the DC bus line voltage, and the divided voltage output is used as a feedback voltage. Reference numeral 23A is an AVR control device (constant voltage control device), which controls the output voltage of the inverse conversion device 12 to be constant according to the voltage between the DC bus lines 11, and includes a limiter circuit 17 and an amplification circuit 18. , EC-
α conversion gate signal generator 19, voltage reference setter 20, V
-I characteristic inclination adjuster 22.

Of these, the limiter circuit 17 is a setter that adjusts the limits (upper limit value and lower limit value) of the control signal and outputs a voltage reference that determines the limits (upper limit and lower limit) for performing inverse conversion. It is a container that can be set to a desired value. Further, the voltage reference setter 20 sets a voltage reference that defines the lower limit voltage value of the DC bus 11 at which execution of the inverse conversion operation is started, and this can also be set to a desired value. The amplifier circuit 18 is a signal amplifier circuit, and is an algebraic addition value of the voltage reference of the voltage reference setter 20 and the divided voltage of the voltage dividing resistors 15 and 16 (with respect to the voltage reference given by the voltage reference setter 20. Voltage divider resistor 15,
The difference (divided voltage by 16) is used as a signal input and is amplified and output.

Further, the VI characteristic inclination adjuster 22 is
It is a setter that adjusts the slope of the characteristics (V is the voltage, I is the current), and can be set arbitrarily, and the detected current value of the current transformer 21 can be adjusted according to the adjusted VI characteristics. It is to convert.

The details of the control device 23A are shown in FIG. 2, and the control signal, which is a signal (algebraic addition value) of the difference from the voltage reference given from the voltage reference setting device 20, is amplified through the input resistor 25. Circuit 18 and V
The signal from the −I characteristic slope adjuster 22 is input to the amplifier circuit 18 via the input resistor 24. Further, there is a VI characteristic start point adjuster 28 which is a setter for adjusting the start point of the VI characteristic, and the set output of the VI characteristic start point adjuster 28 is an amplifier circuit via the input resistor 26. 18 is input. Then, the amplifier circuit 18 amplifies the signal input through the input resistors 24 to 26 and outputs the amplified signal to the EC-α conversion gate signal generator 19. Reference numeral 27 is a feedback resistor of the amplifier circuit 18.

The VI characteristic start point adjuster 28 is composed of a variable resistor. The potential difference between the potentials + V and -V is divided by the variable resistor to determine the VI characteristic start point (conversion start point voltage). This is a configuration for outputting as a set value. The VI characteristic inclination adjuster 22 is composed of a variable resistor, and the current transformer 21
Current signal which is a detection output signal of the current / voltage converter 29
The voltage converted into a voltage corresponding to the input current via is attenuated and given to the amplifier circuit 18. The magnitude of the attenuation corresponds to the set resistance value of the VI characteristic slope adjuster 22, and the current value of the AC power inversely converted by the inverse converter 12 is subjected to such correction and added to the control signal. As a result, the effect of adjusting the VI characteristic inclination can be given.

The EC-α conversion gate signal generator 19 is a circuit for converting the control signal output from the amplifier circuit 18 into a gate signal, and performs gate control of the thyristor of the inverse conversion device 12 according to the level of the control signal, and the inverse The conversion output of the conversion device 12 is set to have a predetermined frequency and a current value corresponding to the control signal level. Further, the EC-α conversion gate signal generator 19 controls the level of the control signal by the limiter circuit 1.
The above conversion is performed within the range of the upper limit value and the lower limit value given by 7, and when the level of the control signal deviates from the upper limit value, the gate signal conversion operation is performed at the level corresponding to the upper limit value. Stop the gate signal conversion operation.

Next, the operation of the present system having such a configuration will be described. The regenerative output generated by the regenerative braking of the train 10 is returned to the DC bus 11, the load on the DC bus 11 is reduced, and the voltage rises correspondingly.

The voltage of the DC bus 11 is divided by the voltage dividing resistors 15 and 1.
The voltage is divided by 6 and input to the AVR control device 23A. The AVR control device 23A obtains the difference between this divided voltage output and the voltage reference value from the preset voltage reference setting device 20, and inputs this difference to the amplification circuit 18, so that the amplification circuit 1
An amplified output corresponding to the input is obtained from 8. The amplified output is used as a control signal for the EC-α conversion gate signal generator 1
9 is converted into a gate signal corresponding to the level of the control signal, and is supplied to the inverse conversion device 12 as a gate signal for the thyristor bridge of the inverse conversion device 12. The reverse converter 12 is switching-controlled by the gate signal to convert the DC power of the DC bus 11 into an AC voltage having a current level corresponding to the gate signal and having a predetermined frequency, and outputs the AC voltage to the transformer 13. And transformer 1
After being transformed by 3, the power is supplied to the AC system 14.

The current value of the electric power supplied to the AC system 14 is detected by the current transformer 21 and converted into a voltage corresponding to the detected current value by the current / voltage converter 29, and the converted value is supplied to the VI characteristic inclination adjuster 22. Given.

The VI characteristic inclination adjuster 22 is composed of a variable resistor, and the voltage corresponding to the current value supplied to the AC system is input to the amplifier circuit 18 with attenuation corresponding to the set resistance value. The amplifier circuit 18 receives the control signal to which the voltage signal from the VI characteristic inclination adjuster 22 is added as an input and amplifies and outputs the amplified signal.

The magnitude of attenuation by the VI characteristic inclination adjuster 22 corresponds to the preset resistance value of the VI characteristic inclination adjuster 22 set to a desired value in advance, and the inverse conversion device 12 performs the inverse conversion. The control signal corresponding to the voltage of the DC bus 11 by adding such a correction to the current value of the generated AC power and adding it to the control signal is eventually subjected to the VI characteristic inclination adjustment processing by the correction. That is, DC bus 11
This means that the inclination of the VI characteristic has been corrected by the amount corresponding to this correction amount corresponding to the voltage of.

In the AVR controller 23A, the limiter circuit 17 is connected to the EC-α conversion gate signal generator 19 to set the lower limit value of the control signal to be converted into the gate signal.
When the control signal has a level equal to or higher than the lower limit value, a gate signal corresponding to the level of the control signal is output.

The control signal is the voltage reference setter 2
Based on the reference voltage given by 0, the voltage dividing resistor 1
5, a thyristor of the inverse conversion device 12 so that the output AC power of the inverse conversion device 12 corresponds to the level of this control signal. Since it is used to control the conduction angle of the bridge circuit, the voltage reference from the voltage reference setting device 20 is set to correspond to the lower limit voltage value when excess power is generated in the DC system. At the stage where the DC voltage rises by the amount of surplus power corresponding to the regenerative power generated by the regenerative control of the train and reaches the lower limit voltage value, the voltage difference between the DC bus lines 11 with respect to the set voltage reference is determined. It becomes possible to inversely convert the electric power corresponding to the electric energy into an alternating current having a predetermined frequency. That is, the DC power corresponding to the surplus power can be converted into AC power.

Further, the voltage of the DC system is the voltage reference setter 2
When it is lower than the lower limit value determined by the set value of 0, the inverse conversion operation can be stopped and the power regeneration control can be stopped. If the level of the control signal is within the range between the upper limit value and the lower limit value determined by the set value of the limiter circuit 17, the control signal is output as it is, and the inverse conversion operation can be performed. When the value goes out of the upper limit (exceeds the upper limit), it becomes the upper limit level, and when it goes out of the lower limit (below the lower limit), the control signal is not output, the reverse conversion operation is stopped, and the power regeneration control is stopped. To be done. However, even if the level of the control signal deviates from the upper limit value determined by the set value of the limiter circuit 17, the control signal output may be stopped to stop the inverse conversion operation. This configuration is effective in the case where the voltage of the DC system is too high and there is an electrical failure in the stages of the inverse conversion system and the components thereafter.

In this way, when the DC system has surplus power due to the regenerative control output from the train 10, this surplus power is AC power at the required VI characteristic slope and at the desired conversion start point voltage. Since it can be converted back to and supplied to the AC system, not only can this surplus power in the DC system be utilized in the AC system, but also when multiple units are operated in parallel, the regenerative electric power can be shared evenly. It is possible to obtain a regenerative control inverse conversion device that can be

In the present invention, the AC side regenerative current is newly incorporated as a control signal in the DC voltage reference signal and the DC voltage feedback signal which are incorporated in the AVR control of the regenerative control inverse conversion device. Then, by inputting this AC side regenerative current as a new feedback signal into the control, the start point and slope of the VI characteristic of the AVR control are changed, and the existing regenerative control V
It was made to agree with the -I characteristic.

Since the existing regenerative control based on the regenerative control VI characteristic can be matched with the VI characteristic, the electric power distribution during regeneration can be equalized even when a plurality of units are simultaneously operated. it can.

When the AC side regenerative current is taken into the AVR control, the original AVR control, that is, the power regeneration operation to the AC side system due to the DC side voltage rise is performed, and at the same time, the AC side regenerative current is increased and V- Correction will be added to the I characteristic. By this correction, the existing regenerative control based on the regenerative control VI characteristic can be matched with the VI characteristic, so that the electric power is shared evenly during regeneration even when a plurality of units are simultaneously operated. be able to.

Then, for the regenerative control inverse conversion device having the standard regenerative control VI characteristic, the train running information such as the amount of the AC regenerative current taken in by the regenerative control inverse converter that takes in the regenerative control AC side regenerative current. By finely adjusting in accordance with the above, the regenerative electric power amount of each regenerative control inverse conversion device is equally shared.

By allowing the regenerative control inverse conversion device to have the above-mentioned functions, the regenerative power with the regenerative control inverse conversion device added to the same DC system can be added without any modification to the existing regenerative control inverse conversion device. The original function of evenly sharing the amount can be satisfied, and the adjustment can be simplified by finely adjusting the amount of regenerated current on the AC side that is newly incorporated as a control element. .

The present invention is not limited to the above-described embodiments, but can be carried out by appropriately modifying it within the scope of the invention. For example, in the above embodiment, the device was realized by an analog method, but the point is that when converting direct current to alternating current power, it is possible to freely adjust the slope of the characteristic of the voltage-current conversion that differs depending on the device, and the alternating current power Since the DC starting point voltage to be converted to is freely set, the present invention is not limited to a specific configuration as long as the configuration can satisfy such a technical idea.

Further, according to the present invention, the voltage-current conversion characteristic can be adjusted to a desired characteristic, and the starting point voltage for converting the electric power of the DC system into the AC power can be arbitrarily set. It is possible to convert the power of the DC system into AC power based on the desired voltage-current conversion characteristics rather than the voltage.Therefore, even when operating multiple units of this device installed in the same DC system, the It becomes possible to match the current conversion characteristics and the starting point voltage for converting DC system power to AC power, and even when multiple units are installed in the same DC system and operated, the regenerative power distribution can be made even. Thus, a regenerative control inverse conversion device is obtained.

[0053]

As described above in detail, according to the present invention,
It is possible to provide a regenerative control inverse conversion device that can evenly share the regenerative power even when a plurality of units are operated in parallel.

[Brief description of drawings]

FIG. 1 is a diagram for explaining an embodiment of the present invention,
The single line connection diagram which shows one Example of the regenerative control inverse conversion device of this invention.

FIG. 2 is a diagram for explaining an embodiment of the present invention,
FIG. 3 is a detailed view of an AVR control device used in the device of the present invention.

FIG. 3 is a single wire connection diagram showing a configuration example of a conventional regenerative control inverse conversion device.

FIG. 4 is a diagram for explaining a VI characteristic example of two different regenerative control inverse conversion devices.

[Explanation of symbols]

 11 ... DC bus 12 ... Inverting device 13 ... Transformer 14 ... AC system 15, 16 ... Voltage dividing resistor 17 ... Limiter circuit 18 ... Amplifying circuit (signal amplifying circuit) 19 ... EC-α conversion gate signal generator 20 ... Voltage reference setter 21 ... Current transformer 22 ... VI characteristic slope adjuster 23, 23A ... AVR controller 24, 25, 26 ... Resistor 27 ... Resistor 28 ... VI characteristic start point adjuster 29 ... Current / Voltage converter

Claims (3)

[Claims] 1. A DC side system power is converted to AC power according to the voltage of the DC side system by controlling an inverse converter so as to have a predetermined voltage-current conversion characteristic relationship, and power is supplied to the AC side system. As a device for doing so, first detecting means for detecting the voltage of the DC side system, voltage-current conversion characteristic adjusting means for adjusting the voltage-current conversion characteristic to a desired characteristic, and starting point of the AC conversion And a start point setting means for setting a voltage value that is such that the difference between the detection voltage of the first detection means and a preset desired setting value when the detection voltage of the first detection means exceeds the start point. And a control means for controlling the inverse conversion device so as to inversely convert the power of the DC side system into AC power having a corresponding current value based on the adjusted voltage-current conversion characteristics. Characterized by comprising Regeneration control inverters. 2. A device for feeding back to the AC side system by converting the power of the DC side system to AC power by the inverse conversion circuit and supplying the AC side system with a gate controlled switching circuit to convert the DC side system power to AC power. Inverse conversion means for performing inverse conversion and output, first setting means for generating a desired voltage reference, first detection means for detecting the voltage of the DC side system, and converted output current value of the inverse conversion means. A current detection means for detecting a current, a correction means for performing a desired correction set in advance on the detected current value to obtain a correction amount, and a difference signal between the detection voltage of the first detection means and the voltage reference. At the same time, a control amount acquisition unit that corrects the correction amount to the difference signal to obtain a control amount, and a gate signal generation unit that generates a gate signal that becomes a current value output corresponding to the control amount and applies the gate signal to the inverse conversion unit, Comprising and configuring Regeneration control inverters characterized. 3. A device for feeding back to the AC side system by converting the power of the DC side system to AC power by the inverse conversion circuit and having a gate controlled switching circuit, and converting the power of the DC side system to AC power. Inverse conversion means for performing inverse conversion and output, first setting means for generating a desired voltage reference, first detection means for detecting the voltage of the DC side system, and converted output current value of the inverse conversion means. A current detecting means for detecting the current value, a correcting means for performing a desired correction set in advance on the detected current value to obtain a correction amount, and a first means for generating an adjustment voltage for determining the DC voltage value at the reverse conversion start point. 2 setting means, and a difference signal between the detection voltage of the first detection means and the voltage reference is obtained, the adjustment voltage is added to the difference signal, and the correction amount is corrected to obtain a control amount. Control amount acquisition means and this control amount pair Regeneration control inverters, characterized in that configured by including a gate signal generating means, the providing a gate signal to a current value output to the inverse transform means to generate a.