JP3257735B2 - Regenerative control reverse conversion device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a regenerative control reverse converter for regenerating DC power from a DC feeder to an AC system, such as for electric railways.

[0002]

2. Description of the Related Art In a train or locomotive (hereinafter referred to as a train or the like) powered by a DC motor, the DC motor can also be used as a generator. By converting to, it can be used for deceleration of a train or the like.

[0003] With the recent advance in semiconductor technology, from the viewpoint of effective use of energy, for example, kinetic energy during train braking or the like is sent back from a DC system to an AC system,
So-called power regeneration control, which is used as electric power, has been used in various fields.

In general, this control system performs a constant voltage control (hereinafter, referred to as AVR control) of a DC voltage using the DC voltage as a control feedback. As the regenerative power increases along with the increase in braking, a method is used in which the increased surplus power on the DC system side is converted into power on the AC side system.

FIG. 3 is a single-line 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, etc.), 11 is a DC bus,
In the case of railways that supply power from overhead lines (trolley lines), they correspond to overhead lines and tracks. Reference numeral 12 denotes an inverting device using a thyristor bridge circuit, which performs switching control of the DC power from the DC bus 11 to convert the DC power into AC power of a predetermined frequency and outputs the AC power. Reference numeral 13 denotes a transformer for transforming AC power, which is a conversion output of the inverter 12, and the AC power transformed by the transformer 13 is supplied to an AC system 14.

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

Among these, the limiter circuit 17 is a setting device for adjusting the range of the control signal limit, that is, the range of the upper limit value and the lower limit value. In addition, the voltage reference setting device 20
Is for setting and giving a reference voltage.
Is a signal amplification circuit, which is an algebraic addition value of the reference voltage of the voltage reference setting device 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 setting device 20). (A voltage difference value) as a signal input, and amplifies and outputs the amplified signal.

The EC-α conversion gate signal generator 19 is a circuit for converting a control signal output from the amplifier circuit 18 into a gate signal. The EC-α conversion gate signal generator 19 controls the gate of the thyristor of the inverter 12 according to the level of the control signal. The conversion output of the conversion device 12 has 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 applied to the DC bus 1
1, the load on the DC bus 11 is reduced, and the voltage increases accordingly.

The voltage of the DC bus 11 is divided by the voltage dividing resistors 15, 1
6 and is input to the AVR control device 23.
The AVR controller 23 obtains the difference between the divided output and the reference value from the voltage reference setter 20, and uses this difference as the amplification 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.
The signal is input to the -α conversion gate signal generator 19, where it is converted into a gate signal corresponding to the level of the control signal, and given to the inverter 12 as a gate signal for the thyristor bridge of the inverter 12. The inverter 12 converts the DC voltage of the DC bus 11 into an AC voltage having a voltage level corresponding to the gate signal and at a predetermined frequency, and outputs the converted voltage to the transformer 13. Then, after the voltage is transformed by the transformer 13, the power is supplied to the AC system 14.

In the AVR control unit 23, a limiter circuit 17 is connected to an EC-α conversion gate signal generator 19 to set upper and lower limits of a control signal to be converted into a gate signal. , Outputs a gate signal corresponding to the level of the control signal when the level is within the range of the lower limit, and outputs a gate signal of the level of the upper limit when the level exceeds the upper limit.

The control signal is supplied to the voltage reference setter 2.
The voltage dividing resistor 1 is based on a reference voltage given from 0.
Thyristor of the inverter 12 so that the output AC power of the inverter 12 corresponds to the level of the control signal. Since it is used for controlling the conduction angle of the bridge circuit, by setting the voltage reference from the voltage reference setting device 20 to correspond to the lower limit voltage value when surplus power is generated in the DC system, At the stage where the regenerative electric power by the regenerative control of the train or the like is generated and the DC voltage rises by an amount corresponding to the surplus electric power and reaches the lower limit voltage value, at the stage where the voltage difference between the DC buses 11 with respect to the set voltage reference is determined. The power corresponding to the power amount can be inversely converted into an alternating current having a predetermined frequency. That is, DC power corresponding to surplus power can be converted to AC power.

In addition, the voltage of the DC system is
When it is lower than the lower limit value determined by the set value of 0, the reverse conversion operation can be stopped and the power regeneration control can be stopped. In this way, when there is surplus power due to the regenerative control output from the train 10 in the DC system, this surplus power can be inversely converted to AC power and supplied to the AC system. This surplus power can be utilized. The surplus electric power generated by the regenerative control output from the train 10 fluctuates depending on the train operation conditions, so there is concern about a sufficient stable electric power supply source, but the electric power for lighting in the railway premises, escalators, air conditioning equipment, and the like is supplemented. This is an epoch-making point in that it can be used sufficiently for such a purpose, and the surplus power generated by the regenerative control, which is wasted above all, can be effectively used, and it is clean energy.

[0014]

As described above, the regenerative control reverse conversion device capable of converting surplus power on the DC system side to the AC side system and supplying the converted power can utilize electric power effectively. Recently, as the effectiveness of the regenerative control reverse conversion device has been recognized, the number of regenerative control reverse conversion devices has recently increased.

However, when a plurality of regenerative control inverters are added to the same DC system and operated by a plurality of units, when the regenerative control inverter is installed, the regenerative control inverter and the regenerative control inverter are installed. If the share of the regenerative power amount with the converter is not balanced, the regenerative power amount will concentrate on any existing or added regenerative control reverse converter, and the effect of adding the regenerative control reverse converter, that is, The regenerative electric energy cannot be sufficiently increased.

In other words, the regenerative control inverse converter has different regenerative control characteristics (VI characteristics (where V indicates voltage and I indicates current)). An imbalance occurs in the effective regenerative power sharing of the inverter.

FIG. 4 shows an example of regenerative control characteristics (VI characteristics) of the regenerative control inverse converter. A is the VI characteristic of the first regenerative control inverter, and B is the VI characteristic of the second regenerative inverter. a1 is the voltage of the former and b1 is the voltage of 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,
Perform conversion according to the I characteristic curve.

When the amount of power generated in the DC system increases due to the regenerative control of the train and the surplus power increases, the DC bus 11
When the voltage of the DC bus 11 increases and the voltage of the DC bus 11 increases, the current value of the inverse conversion output also increases, and therefore, the amount of power inversely converted to AC increases. The slope of the VI characteristic curve to be determined differs from device to device. A device exhibiting the characteristic A having a small slope can obtain a larger amount of regenerative power than a device exhibiting the characteristic B having a large slope even at the same input voltage value. You can do it. Therefore, the device exhibiting the characteristic of A has high efficiency, whereas the device exhibiting the characteristic of B has low efficiency.

The reverse conversion start point voltage value can be set by the set value of the limiter circuit. However, as shown in this example, the slope of the VI characteristic curve is usually different depending on the regenerative control reverse conversion device. Even if a plurality of regenerative control reverse converters are installed and operated, the operating conditions correspond to their own VI characteristics, so that the amount of power that can be converted varies, and the regenerative power sharing becomes unbalanced. .

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

[0021]

In order to achieve the above object, the present invention is configured as follows. That is, first, the power of the DC side system is converted into AC power according to the voltage of the DC side system by controlling the inverting device so as to have a predetermined voltage-current conversion characteristic relationship. As a power supply device, first detection means for detecting the voltage of the DC side system, voltage-current conversion characteristic adjustment means for adjusting the voltage-current conversion characteristic to a desired characteristic, and start of the AC conversion A starting point setting means for setting a voltage value to be a point, and when a voltage detected by the first detecting means exceeds the starting point, a difference between the detected voltage of the first detecting means and a desired value set in advance. Control means for obtaining a voltage corresponding to the difference, and controlling the inverter in order 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 characteristic. And was configured.

Secondly, as a device for inverting the power of the DC side system to the AC power by the reverse conversion circuit and feeding the AC power to the AC side system, it has a gate-controlled switching circuit, To an AC power, inverting the AC power, outputting a desired voltage reference, a first setting means, a first detecting means for detecting the voltage of the DC side system, Current detection means for detecting a converted output current value; correction means for performing a predetermined desired correction on the detected current value to obtain a tilt correction amount; detection voltage of the first detection means and the voltage reference; And a control amount obtaining means for correcting the inclination correction amount to the difference signal to obtain a control amount, and a gate signal serving as a current value output corresponding to the control amount is generated and supplied to the inverse conversion means. And a gate signal generating means. Configuration was. Further, second setting means for generating an adjustment voltage for determining the DC voltage value of the reverse conversion start point is provided, and the generated adjustment voltage is provided to the control amount obtaining means, and the difference signal from the voltage reference is supplied to the control amount obtaining means. The reverse conversion start voltage can be adjusted by adding the adjustment voltage.

[0023]

In the first configuration, a voltage value serving as a starting point of the AC conversion is set, and a voltage of the DC side system is detected by first detecting means, and the voltage 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 value, and based on the adjusted voltage-current conversion characteristic, obtains a corresponding current value. The reverse conversion device is controlled in order to reversely convert the power of the DC side system into the AC power.

The voltage-current conversion characteristic can be adjusted to a desired characteristic by voltage-current conversion characteristic adjusting means.
In addition, since the starting point voltage for converting the power of the DC system to the AC power can also be set arbitrarily, the power of the DC system can be converted to the AC power based on the desired voltage-current conversion characteristics from the desired starting point voltage. it can. Therefore, even when installing and operating a plurality of the devices in the same DC system, the voltage-current conversion characteristics of each device and the starting point voltage for converting the DC system power to AC power can be matched. In addition, it is possible to obtain a regenerative control reverse conversion device capable of equalizing regenerative power sharing even when a plurality of units are installed and operated in the same DC system.

Further, in the case of the second configuration, a reverse conversion means having a switching circuit which is gate-controlled and reversely converting the power of the DC side system into AC power is used, and the gate control is performed by the control. The amount obtaining 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 amount, and provides the control signal to the gate signal generation means. Thus, a gate signal serving as a current value output corresponding to the control amount is generated and supplied to the inverting means to convert the power of the DC system into AC power.

The correction amount is obtained by subjecting the converted output current value of the inverse conversion means detected by the current detection means to a desired correction set in advance by the correction means. This means that 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 for generating an adjustment voltage for determining the DC voltage value at the start point of the inverse conversion is provided, and the generated adjustment voltage is supplied to the control amount obtaining means, and the control value acquisition means is provided. By adding the adjustment voltage to the difference signal, the reverse conversion start voltage can be adjusted. Therefore, since the starting point voltage for converting the power of the DC system to the AC power can be arbitrarily set, the desired starting point voltage can be converted to a power amount according to the desired characteristics. When installing and operating multiple units in the grid,
The mutual voltage-current conversion characteristics and the starting point voltage for converting DC system power to AC power can be matched, and even if multiple units are installed and operated in the same DC system, the regenerative power sharing is evenly distributed. Thus, a regenerative control reverse conversion device capable of performing the operation is obtained.

[0028]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention relates to a regenerative control reverse-conversion device for inverting the power of a DC side system into AC power and feeding the AC side system with a constant voltage control function for maintaining a constant voltage value of the DC side system. Inverter side output current is taken in as a control feedback element, and when multiple regenerative control inverters are connected to the same DC line, control is performed so that the regenerative current sharing of each regenerative control inverter is equal. The present invention is characterized in that characteristics can be finely adjusted. Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a system configuration diagram showing one embodiment of the regenerative control reverse conversion device according to the present invention, and FIG. 2 is a single line connection showing one embodiment of the AVR control device portion of the regenerative control reverse conversion device according to the present invention. FIG.

In FIGS. 1 and 2, reference numeral 10 denotes a train (train or electric locomotive), and reference numeral 11 denotes 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 denotes an inverting device using a thyristor bridge circuit, which performs switching control of the DC power from the DC bus 11 to convert the DC power into AC power of a predetermined frequency and outputs the AC power. Reference numeral 13 denotes a transformer for transforming AC power, which is a conversion output of the inverter 12.
The AC power transformed by 3 is supplied to the AC system 14. Reference numeral 21 denotes a current transformer, which is connected from the transformer 13 to the AC system 14.
Is a device that detects an AC regenerative current value supplied to the power supply and generates a detection output corresponding to the current value.

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

Among them, the limiter circuit 17 is a setting device for adjusting the limit (upper limit value, lower limit value) of the control signal, and is a setting device for outputting a voltage reference for defining the limit (upper limit and lower limit) for performing the inverse conversion. Which can be set and operated to a desired value. Further, the voltage reference setting device 20 sets a voltage reference that determines the lower limit voltage value of the DC bus 11 at which the execution of the inverse conversion operation is started, and this can also be set to a desired value. The amplifying circuit 18 is a signal amplifying circuit, and includes an algebraic addition value of a voltage reference of the voltage reference setting device 20 and a divided voltage of the voltage dividing resistors 15 and 16 (with respect to a voltage reference given from the voltage reference setting device 20). Voltage dividing resistor 15,
16) is amplified and output as a signal input.

The VI characteristic inclination adjuster 22 is connected to the VI characteristic
A setting device for adjusting the slope of the characteristic (where V is a voltage and I is a current) can be set arbitrarily, and the detected current value of the current transformer 21 can be adjusted to a voltage corresponding to the adjusted VI characteristic. It is something to convert.

The control device 23A has a configuration as shown in FIG. 2 in detail, and a control signal which is a difference signal (algebraic addition value) with respect to the voltage reference given from the voltage reference setting device 20 is amplified through an input resistor 25. In circuit 18 and V
The signal of the -I characteristic tilt 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. The setting output of the VI characteristic start point adjuster 28 is supplied to the amplifier circuit via the input resistor 26. 18 is input. The amplification 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. 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 a variable resistor to determine the VI characteristic start point (conversion start point voltage). This is a configuration for outputting as a set value. Further, the VI characteristic inclination adjuster 22 is constituted by a variable resistor,
The current signal which is the detection output signal of
And attenuates the voltage converted to a voltage corresponding to the input current and supplies the resulting signal to the amplifier circuit 18. The amount of attenuation corresponds to the set resistance value of the VI characteristic inclination adjuster 22, and the current value of the AC power inversely converted by the inverter 12 is subjected to such correction and added to the control signal. As a result, the function of adjusting the VI characteristic inclination can be obtained.

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 the gate control of the thyristor of the inverter 12 according to the level of the control signal. The conversion output of the conversion device 12 has a predetermined frequency and a current value corresponding to the control signal level. The EC-α conversion gate signal generator 19 controls the level of the control signal by the limiter circuit 1.
7 is performed within the range of the upper limit value and the lower limit value given by 7. When the level of the control signal is outside 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 fed back to the DC bus 11, the load on the DC bus 11 is reduced, and the voltage increases accordingly.

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

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

The VI characteristic slope adjuster 22 is constituted by a variable resistor, and the voltage corresponding to the current value supplied to the AC system is attenuated according to the set resistance value and is input to the amplifier circuit 18. Then, the amplifier circuit 18 receives, as an input, a signal obtained by adding the voltage signal from the VI characteristic slope adjuster 22 to the control signal, amplifies the signal, and outputs the amplified signal.

The amount of attenuation by the VI characteristic inclination adjuster 22 corresponds to the resistance value set in the VI characteristic inclination adjuster 22 which has been set to a desired value in advance. By adding such a correction to the current value of the AC power thus obtained and adding the correction to the control signal, the control signal corresponding to the voltage of the DC bus 11 is subjected to the VI characteristic inclination adjustment processing as a result of the correction. This means that the DC bus 11
This means that the slope of the VI characteristic has been corrected by the amount corresponding to this correction amount in accordance with the voltage of.

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

The control signal is supplied to the voltage reference setting device 2
The voltage dividing resistor 1 is based on a reference voltage given from 0.
Thyristor of the inverter 12 so that the output AC power of the inverter 12 corresponds to the level of the control signal. Since it is used for controlling the conduction angle of the bridge circuit, by setting the voltage reference from the voltage reference setting device 20 to correspond to the lower limit voltage value when surplus power is generated in the DC system, At the stage where the regenerative electric power by the regenerative control of the train or the like is generated and the DC voltage rises by an amount corresponding to the surplus electric power and reaches the lower limit voltage value, at the stage where the voltage difference between the DC buses 11 with respect to the set voltage reference is determined. The power corresponding to the power amount can be inversely converted into an alternating current having a predetermined frequency. That is, DC power corresponding to surplus power can be converted to AC power.

Further, the voltage of the DC system is
When it is lower than the lower limit value determined by the set value of 0, the reverse conversion operation can be stopped and the power regeneration control can be stopped. When the level of the control signal is within the range between the upper limit and the lower limit determined by the set value of the limiter circuit 17, the control signal is output at that level as it is, and the inverse conversion operation can be performed. When exceeding the upper limit value (when exceeding the upper limit value), the level becomes the upper limit value. When exceeding the lower limit value (when lowering below the lower limit value), no control signal is output, and the reverse conversion operation is stopped and the power regeneration control is stopped. Is done. However, even when the level of the control signal deviates from the upper limit determined by the set value of the limiter circuit 17, the output of the control signal 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 the components of the inverse conversion stage and subsequent components are electrically impaired.

As described above, when there is surplus power due to the regenerative control output from the train 10 in the DC system, this surplus power is applied to the AC power at a required VI characteristic slope and at a desired conversion start point voltage. The surplus power in the DC system can be utilized in the AC system, and even if multiple units are operated in parallel, the regenerative power can be shared evenly. And a regenerative control reverse conversion device capable of

In the present invention, the AC side regenerative current is newly taken in as a control signal in the DC voltage reference signal and the DC voltage feedback signal taken in the AVR control of the regenerative control inverse converter. Then, by starting the AC side regenerative current as a new feedback signal, the start point and the slope of the VI characteristic of the AVR control are changed, and the existing regenerative control V
-Matched to I characteristics.

Further, since the existing regenerative control based on the regenerative control VI characteristic can be made to match the VI characteristic, even when a plurality of units are operated simultaneously, the power sharing during regeneration can be made equal. it can.

When the AC side regenerative current is taken into the AVR control, the original AVR control, that is, the power regenerating 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 increases, and The correction is added to the I characteristic. By this correction, the existing regenerative control based on the regenerative control VI characteristic can be made to match the VI characteristic, so that even when a plurality of units are operated at the same time, the power sharing during regenerative operation is equalized. be able to.

The regenerative control inverse converter having the regenerative control VI characteristic as a reference is used to determine the amount of the AC regenerative current taken in by the regenerative control inverter that incorporates the AC regenerative current into the regenerative control. By making fine adjustments in accordance with the above, the regenerative electric energy of each regenerative control reverse conversion device is equally shared.

Since the regenerative control inverter can be provided with the above functions, the regenerative power of the regenerative control inverter can be increased without changing the existing regenerative control inverter. The original function of equally sharing the amount can be satisfied, and the adjustment can be simplified by fine-tuning the amount of AC regenerative current taken in as a new control element. .

It should be noted that the present invention is not limited to the above-described embodiment, but can be carried out by appropriately modifying it without departing from the gist thereof. For example, in the above-described embodiment, the device is realized by an analog method, but the point is that in converting DC into AC power, the slope of the characteristic of the voltage-current conversion that is different depending on the device can be freely adjusted. The present invention is not limited to a specific configuration as long as such a technical idea can be satisfied, since the starting point voltage of the DC to be converted into the voltage can be freely set.

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 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 characteristic from the voltage. Current conversion characteristics and the starting point voltage for converting DC system power to AC power can be matched, and even if multiple units are installed and operated in the same DC system, regenerative power sharing can be equalized. Thus, a regenerative control reverse conversion device is obtained.

[0053]

As described in detail above, according to the present invention,
Even when a plurality of units are operated in parallel, a regenerative control reverse conversion device that can equalize the regenerative power distribution can be provided.

[Brief description of the drawings]

FIG. 1 is a diagram for explaining an embodiment of the present invention,
1 is a single-line connection diagram showing an embodiment of a regenerative control reverse conversion device according to the present invention.

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

FIG. 3 is a single-line diagram showing a configuration example of a conventional regenerative control reverse conversion device.

FIG. 4 is a diagram for explaining VI characteristic examples of two different regenerative control inverse converters.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 ... DC bus 12 ... Inverting converter 13 ... Transformer 14 ... AC system 15, 16 ... Division resistor 17 ... Limiter circuit 18 ... Amplifier circuit (signal amplifier circuit) 19 ... EC-α conversion gate signal generator 20 ... Voltage reference setting device 21 Current transformer 22 VI characteristic inclination adjuster 23, 23 A AVR control device 24, 25, 26 Resistor 27 Resistor 28 VI characteristic start point adjuster 29 Current / Voltage converter

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) H02M 7/72 H02J 3/38 H02M 1/08

Claims (3)

(57) [Claims] An inverting device is controlled to convert the power of a DC side system into an AC power according to a voltage of the DC side system so as to have a predetermined voltage-current conversion characteristic, and the AC side system is supplied with power. as a device for a first detecting means for detecting the voltage of the DC-side system, the voltage - in order to current conversion characteristic and the desired characteristic, that particular
Voltage-current conversion characteristic slope adjusting means for adjusting the slope of the characteristic, starting point setting means for setting a voltage value serving as a starting point of the AC conversion, and a voltage detected by the first detecting means exceeding the starting point. At this time, a voltage corresponding to a difference between the detection voltage of the first detection means and a predetermined set value set in advance is obtained, and the obtained voltage is referred to as the voltage.
Control means for controlling an inverting device in order to invert the power of the DC side system into AC power of a corresponding current value based on the voltage-current conversion characteristics adjusted in inclination. Regenerative control reverse conversion device. 2. A device for inversely converting power of a DC side system into AC power by an inverse conversion circuit and supplying power to the AC side system, comprising a gate-controlled switching circuit, and converting power of the DC side system into AC power. Inverting means for inverting and outputting, first setting means for generating a desired voltage reference, first detecting means for detecting the voltage of the DC side system, and a converted output current value of the inverting means Current detecting means for detecting the current value, and adjusting the inclination to the detected current value as desired.
The set voltage Ri - a correction means for obtaining a correction amount by performing complement <br/> positive based on the adjustment value by the current conversion characteristic, along with obtaining a difference signal between the detection voltage of said first detecting means and said voltage reference A control amount obtaining 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 serving as a current value output corresponding to the control amount and supplies the gate signal to the inverse conversion unit. A regenerative control reverse conversion device comprising: 3. A gate-controlled switching circuit as a device for inverting the power of a DC side system into AC power by an inverse conversion circuit and feeding the AC power to the AC side system, wherein the power of the DC side system is converted to AC power. Inverting means for inverting and outputting, first setting means for generating a desired voltage reference, first detecting means for detecting the voltage of the DC side system, and a converted output current value of the inverting means A current detecting means for detecting a current value, and a correcting means for performing a correction based on an adjustment value based on a set voltage-current conversion characteristic by adjusting a slope of the detected current value as desired to obtain a correction amount. A second setting unit for generating an adjustment voltage that determines a DC voltage value of a reverse conversion start point; and obtaining a difference signal between the detection voltage of the first detection unit and the voltage reference, and obtaining the difference signal. To the adjustment voltage, and Control amount obtaining means for correcting the correction amount to obtain a control amount; and gate signal generating means for generating a gate signal serving as a current value output corresponding to the control amount and supplying the gate signal to the inverse conversion means. A regenerative control reverse conversion device characterized by the above-mentioned.