JP6597168B2 - Control method and control device for regenerative inverter for electric railway - Google Patents

Description

  The present invention relates to a control method and a control device for a regenerative inverter in a DC feeder system for electric railways.

  An electric railway DC feeder system is a system that converts AC grid power into DC power using a rectifier in a substation, and supplies the DC power to a train of an electric railway through a feeder line. In this system, AC power of an AC system is converted into DC power by a diode rectifier, a thyristor rectifier, or the like provided at a substation, and power is supplied to a feeder (for example, Patent Documents 1 and 2).

  In electric railways, the number of regenerative vehicles that regenerate during braking, such as when decelerating or stopping, is increasing, but the above rectifier does not have a regenerative function. It cannot be regenerated in the AC system. If the regenerative power is not consumed in the feeder that is the DC power section, the feeding voltage will increase.

  Therefore, DC power feeding systems 7 to 9 for electric railways that consume regenerative power as shown in FIGS. 3A to 3C are employed (for example, Patent Document 3). In the DC feeding system 7 of FIG. 3A, the regenerative inverter 2 is provided, and regenerative power generated when the regenerative vehicle 10 is braked is regenerated from the feeder 11 to the AC system 12 via the regenerative inverter 2. Further, in the DC feeding system 8 of FIG. 3B, a regenerative resistance device 13 that consumes regenerative power is provided, and a regenerative current is passed through the regenerative resistance device 13 via the chopper device and consumed. In the DC feeding system 9 of FIG. 3C, the power storage device 14 is provided, and the regenerative power generated in the feeder 11 is stored in the power storage device 14 via the chopper device.

  The regenerative inverter 2 of the DC feeding system 7 shown in FIG. 3A is constituted by a power semiconductor such as an IGBT, and converts the feeding DC power into AC power by a switching operation of the power semiconductor. When the regenerative inverter 2 returns the regenerative power generated in the regenerative vehicle 10 to the AC system 12, the regenerative power is consumed, and an increase in feeding voltage is suppressed. By suppressing the increase in the feeding voltage, the regeneration invalidation of the regenerative vehicle 10 and the overvoltage breakdown of the feeding are prevented.

  FIG. 4 is a block diagram of the control device 15 for the regenerative inverter 2 used in the DC feeding system 7 of FIG. The control device 15 includes a comparator 3 and a comparator 4.

  The comparator 3 transmits an operation command signal to the regenerative inverter 2. The comparator 3 receives a feed voltage detection value and a regenerative absorption start voltage that is a predetermined set value. Then, the comparator 3 compares the detected feed voltage with the regenerative absorption start voltage, and outputs an operation command signal to the regenerative inverter 2 when the feed voltage detected value> the regenerative absorption start voltage.

  The comparator 4 transmits a stop command signal to the regenerative inverter 2. The comparator 4 receives the feed voltage detection value and the difference between the regeneration absorption start voltage and the stop offset voltage. The comparator 4 compares the feed voltage detection value with the difference between the regeneration absorption start voltage and the stop offset voltage. When the feed voltage detection value <the difference between the regeneration absorption start voltage and the stop offset voltage, the stop command A signal is output to the regenerative inverter 2. The stop offset voltage is provided in order to avoid repetition of operation / stop when the feed voltage detection value≈the regeneration absorption start voltage.

JP-A-7-304353 JP-A-1-132432 JP 2007-210513 A JP-A-8-205405

  Even if the DC feeding system is configured as shown in FIG. 3 (a) and the regenerative power is regenerated to the AC system 12 via the regenerative inverter 2 to effectively use the power, Depending on the arrangement, regenerative power may not be sold to the power company. In this case, there is no advantage in the system of FIG. Even if regenerative power can be sold to an electric power company, losses such as conduction loss and switching loss of the power semiconductor occur during operation of the regenerative inverter. The electric power company bears the power charge for this loss, and the long operation time of the regenerative inverter is not preferable from the viewpoint of both the power charge and energy saving.

  Then, an object of this invention is to provide the control method and control apparatus of a regenerative inverter which contribute to reduction of the power loss in a regenerative inverter.

  The regenerative inverter control method of the present invention that achieves the above object is a regenerative inverter control method in a DC power feeding system for electric railways having a regenerative inverter, and varies the regenerative absorption start voltage of the regenerative inverter according to a time zone. The regenerative absorption start voltage in the time zone with many trains existing in the section in charge of the regenerative inverter is set higher than the regenerative absorption start voltage in the time zone with few trains in the section in charge of the regenerative inverter. It is said.

  The control device of the present invention that achieves the above object is a control device for a DC power feeding system for an electric railway that regenerates regenerative power generated at the time of braking of a train from a feeder to an AC system through a regenerative inverter. The apparatus includes a regeneration start selection unit that selects a regeneration absorption start voltage of the regeneration inverter, and the regeneration start selection unit is configured such that the regeneration inverter is in a time zone in which there are many trains that exist in a section in charge of the regeneration inverter. Select a regenerative absorption start voltage that is higher than the regenerative absorption start voltage in the time zone when there are few trains in the section in charge, and the control device detects the regenerative absorption start voltage selected by the regeneration start selection unit and the feeder line The regenerative inverter operation of the regenerative inverter is controlled based on the detected feed voltage detection value.

  According to the above invention, the power loss in the regenerative inverter can be reduced.

It is a block diagram of the control apparatus of the regenerative inverter which concerns on embodiment of this invention. It is a figure which shows the example of a setting of the regeneration absorption start voltage of the regeneration inverter according to a time slot | zone (1 day). (A) The figure which shows an example of the DC feeding system provided with the regenerative inverter for regenerating a regenerative electric power from a feeder to an alternating current system, (b) The direct current feeding system provided with the regenerative resistance device which consumes regenerative power It is a figure which shows an example, (c) It is a figure which shows an example of the DC feeding system provided with the electrical storage apparatus which stores regenerative electric power. It is a block diagram of the control apparatus of the regenerative inverter which concerns on a prior art.

  A regenerative inverter control method and control apparatus according to an embodiment of the present invention will be described in detail with reference to the drawings. In the description of the embodiments, the preferred embodiments of the present invention will be shown and described. However, the present invention is not limited to the embodiments, and the design can be changed as appropriate without departing from the characteristics of the invention. In addition, the regenerative inverter control method and control apparatus according to the present invention regenerates regenerative power generated during braking of the regenerative vehicle 10 from the feeder 11 to the AC system 12 as shown in FIG. The present invention can be applied to a DC feeding system 7 having a regenerative inverter 2. Therefore, the regenerative inverter 2 and the control device 1 described in detail later are provided in, for example, a substation (not shown) provided between the feeder 11 and the AC system 12.

  FIG. 1 is a block diagram of a control device 1 according to an embodiment of the present invention. The control device 1 controls operation / stop for the regenerative operation of the regenerative inverter 2, and includes a comparator 3, a comparator 4, and a regeneration start selection unit 5. In addition, the control apparatus 1 is provided with the regeneration start selection part 5 having a function of selecting and outputting the regeneration absorption start voltage according to the time zone in the control apparatus 15 according to the related art shown in FIG. Therefore, the same components as those of the control device 15 according to the related art will be described with the same reference numerals.

  The regeneration start selection unit 5 selects a regeneration absorption start voltage according to the time zone. For example, a signal indicating time zone information such as a timer is input to the regeneration start selection unit 5, a regeneration absorption start voltage corresponding to the time zone is selected, and the selected regeneration absorption start voltage is compared with the comparator 3 and the subtractor. 6 is output. The regeneration start selection unit 5 determines in advance whether the train is dense or dense in a predetermined section based on information such as an operation schedule in advance, and the regeneration absorption start voltage that is higher in a time zone in which the number of trains existing in the predetermined section is large. Is selected, and the regenerative inverter 2 is controlled so that the regenerative electric power generated by the regenerative vehicle is consumed as the force action force of other trains. In addition, the regeneration start selection part 5 can also be set as the aspect which detects the density state of the train which exists in a predetermined area, and selects a regeneration absorption start voltage according to the detected density state of the train.

  The comparator 3 transmits an operation command signal to the regenerative inverter 2. The comparator 3 receives the feed voltage detection value and the regeneration absorption start voltage selected by the regeneration start selection unit 5 (hereinafter referred to as the selected regeneration absorption start voltage). Then, the comparator 3 compares the feed voltage detection value with the selected regenerative absorption start voltage, and the operation command signal is sent to the regenerative inverter 2 when the feed voltage detection value> the selected regenerative absorption start voltage. Is output. When this operation command signal rises from 0 to 1, the regenerative inverter 2 operates.

  The comparator 4 transmits a stop command signal to the regenerative inverter 2. The comparator 4 receives the detected feed voltage and the difference between the selected regenerative absorption start voltage and the stop offset voltage (that is, the stop voltage) that is the output signal from the subtractor 6. Then, in the comparator 4, the feeding voltage detection value is compared with the difference between the selected regenerative absorption start voltage and the stop offset voltage, and the feeding voltage detection value <the difference between the selected regenerative absorption start voltage and the stop offset voltage. At this time, a stop command signal is output to the regenerative inverter 2. When this stop command signal rises from 0 to 1, the regenerative inverter 2 stops.

  FIG. 2 is a diagram illustrating a setting example of the regeneration absorption start voltage by the control device 1. In this setting example, the regenerative absorption start voltage is set to 1 to 3 according to the time zone, but the set value of the regenerative absorption start voltage is not limited to 3 and may be 2 or more. .

  Time zone 1: For example, when there is only one train in the section that the rectifier of the substation and the regenerative inverter 2 are in charge, there is no other train that consumes regenerative power when the regenerative vehicle decelerates or stops. As soon as the electric voltage rises, it is necessary to operate the regenerative inverter 2 to perform regenerative absorption. Therefore, the regeneration start selection unit 5 selects the regeneration absorption start voltage 1 that is close to the no-load voltage, thereby ensuring the prevention of the train regeneration expiration and the electric overvoltage.

  Time zone 2: For example, this is a case where a plurality of trains exist at short intervals such as morning and evening rush hours in a section in charge of the rectifier and the regenerative inverter 2 of the substation. The regeneration start selection unit 5 selects a regeneration absorption start voltage 2 that is higher than the regeneration absorption start voltage 1 in time zone 1 and near the regeneration invalidation voltage of the train. As a result, the operation opportunity of the regenerative inverter 2 is reduced, and the regenerative power generated by the regenerative vehicle is consumed as power for trains that are not regenerating regenerative power in the section or as auxiliary equipment (lighting, air conditioning equipment, compressor) power supply. The

  Time zone 3: The density of the train in the section handled by the substation rectifier and the regenerative inverter 2 is an intermediate state between the time zone 1 and the time zone 2. In this case, the regeneration start selection unit 5 selects a regeneration absorption start voltage 3 that is intermediate between the regeneration absorption start voltage 1 and the regeneration absorption start voltage 2.

  According to the control method and the control device 1 of the regenerative inverter 2 according to the embodiment of the present invention as described above, the operation opportunity of the regenerative inverter 2 is reduced in a time zone in which there are many trains present in the section in charge of the regenerative inverter 2. As a result, the loss generated in the regenerative inverter 2 can be reduced. As a result, it is possible to realize energy saving and a reduction in power charges for the loss of the regenerative inverter 2 in a time zone with many trains while improving the reliability of the DC feeding system.

  In other words, since there are few trains that consume regenerative power in a time zone where there are few trains in the section that the regenerative inverter 2 is in charge of, the regeneration regeneration start voltage of the regenerative inverter 2 is set to be low, so that the train regeneration can be ensured. It can be controlled so that it does not fall into a revocation or fire overvoltage. The lower limit of the regeneration absorption starting voltage at this time is set higher than the substation rectifier no-load voltage.

  Moreover, in the time zone when there are many trains that exist in the section in charge of the regenerative inverter 2, by setting the regenerative absorption start voltage of the regenerative inverter 2 to be higher, it is possible to increase the chances of consuming regenerative power between trains. That is, the regenerative power consumed by feeding can be increased, and the power returned to the AC system via the regenerative inverter 2 can be reduced. At this time, the upper limit of the regeneration absorption starting voltage is set lower than the regeneration invalidation voltage of the train.

  In Patent Document 4, a technique for controlling the electric voltage according to the number of trains operated is disclosed. This is the control of the number of devices operated in a substation (transformer, thyristor rectifier, regenerative inverter device). Based on the transformation ratio of the transformer in the substation, the electric voltage is controlled to the target value.

  On the other hand, in the control method and the control device 1 of the regenerative inverter 2 according to the present invention, by changing the absorption start voltage of the regenerative inverter 2, the rectifier no-load voltage of the substation <the feeding voltage <the regeneration revocation voltage of the train , To control. Therefore, compared with patent document 4, the structure for changing the transformation ratio of transformers, such as a tap changer, becomes unnecessary. In addition, a plurality of devices necessary for controlling the number of operating units are not required. That is, compared to Patent Document 4, the feeding system can be reduced in size and cost.

  Further, even if the regenerative inverter 2 returns the regenerative power to the AC system, the power company may not be able to sell the regenerative power to the power company depending on the arrangement between the power company and the power company. In this case, there are few economic advantages of the electric railway company by operating the regenerative inverter 2. Therefore, as in the present invention, by controlling the regenerative inverter 2 and reducing the opportunity to consume regenerative power in the AC system, not only can the power loss in the regenerative inverter 2 be reduced, but also the regenerative inverter 2 is operated for a long time. The operating cost can be reduced.

DESCRIPTION OF SYMBOLS 1 ... Control apparatus 2 ... Regenerative inverter 3, 4 ... Comparator 5 ... Regeneration start selection part 6 ... Subtractor

Claims (2)

A control method for a regenerative inverter in a DC power feeding system for an electric railway having a regenerative inverter,
Vary the regenerative absorption start voltage of the regenerative inverter according to the time zone,
The regeneration absorption start voltage of the time zone with many trains existing in the section in charge of the regenerative inverter is set higher than the regeneration absorption start voltage of the time zone with few trains existing in the section in charge of the regenerative inverter. Control method for regenerative inverter. A control device for a DC power feeding system for electric railways that regenerates regenerative power generated during train braking from a feeder to a AC system through a regenerative inverter,
The control device has a regeneration start selection unit that selects a regeneration absorption start voltage of the regeneration inverter,
The regeneration start selection unit has a regeneration absorption start voltage higher than a regeneration absorption start voltage in a time zone where there are few trains present in the section in charge of the regenerative inverter in a time zone where there are many trains in the section in charge of the regeneration inverter. Select
The control device controls the regenerative absorption operation of the regenerative inverter based on the regenerative absorption start voltage selected by the regenerative start selection unit and the feed voltage detection value detected by the feeder line. Control device.

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