JP5482491B2 - DC electric railway power storage device - Google Patents

Description

  The present invention relates to a power storage device that supplies power running power of an electric vehicle or absorbs regenerative power, and in particular, control for preventing regeneration invalidation of the electric vehicle by regenerative current narrowing control by the electric vehicle and regenerative absorption voltage control of the power storage medium. Relates to the device.

  In general, not all regenerative electric power of a regenerative vehicle can be used in a powering vehicle, and this regenerated electric power that is not used becomes surplus electric power. Therefore, as shown in FIG. 6 which shows a feeding circuit diagram of the DC electric railway, the power storage device 100 constituted by the power storage medium and the DC / DC converter is connected in parallel through the electric vehicle 200, the feeder 300 and the rail 400. Then, the regenerative electric power when the electric vehicle 200 is operated for regenerative braking is regenerated as a charging current for the electric power storage medium, and this regenerative electric power is supplied as the electric power for the electric vehicle 200 to power as the discharge current of the electric power storage medium.

  FIG. 7 shows a configuration example of a power storage device 100 using an electric double layer capacitor (hereinafter referred to as EDLC) as a power storage medium. In addition to the bidirectional chopper 11 as a DC / DC converter and the EDLC 12 as a power storage medium, the power storage device 100 is provided with a filter reactor 13 and a filter capacitor 14 in series between the feeder 300 and the rail 400. . Further, in order to obtain a detection value in charge / discharge control by the bidirectional chopper 11, a feeding current detector 15 and a feeding voltage detector 16 are provided on a connection line between the filter reactor 13 and the electric wire 300, and the bidirectional chopper is provided. 11 and the EDLC 12 are provided with an EDLC voltage detector 17 and an EDLC current detector 18. The control device 19 having a software configuration that realizes a desired control function using the computer resources has a voltage control function and a current control function, and detects the voltage and current of each detector 15, 16, 17, 18. The charge / discharge mode is switched and controlled based on the signal. In the charge mode, the voltage on the power supply side is stepped down by the bidirectional chopper 11 and stored in the EDLC 12, and in the discharge mode, the voltage of the EDLC 12 is boosted by the bidirectional chopper 11. Discharge to the side.

  FIG. 8 shows a charge / discharge control mode by the control device 19. If the feeding voltage is equal to or higher than the charging start voltage of the EDLC 12, the control device 19 shifts to the charging mode and controls the charging of the EDLC 12, and the feeding voltage is lower than the charging start voltage and lower than the discharge starting voltage. Is lowered, the discharge mode is changed to perform the discharge control from the EDLC 12, and when it is higher than the discharge start voltage, the standby mode is changed to stop the charge / discharge control in the EDLC 12.

  In such a power storage device, when the power storage medium is fully charged, no more regenerative power can be absorbed. When regenerative braking of an electric vehicle occurs in this fully charged state, the regenerative invalidation (electric braking is impossible) occurs on the electric vehicle side, the regenerative operation is stopped, and the braking method is switched from the electric brake to the mechanical brake. A braking delay occurs. Due to this braking delay, sudden braking of the mechanical brake causes problems such as failure to stop the electric vehicle at a fixed point and shortening the service life due to increased wear of wheels and brake shoes.

  As a countermeasure against the above regenerative invalidation, the electric car's regenerative current control function (function to narrow the regenerative current from 100% to 0% according to the punter point voltage above the specified value) is used. When the regenerative current can be regenerated as the charging current of the storage medium and the electric voltage exceeds a certain value, the charging voltage of the power storage device is raised with a drooping characteristic corresponding to the regenerative current narrowing characteristic of the electric vehicle, The present applicant has already proposed what prevents regenerative invalidation by increasing the amount of regenerative current in the electric vehicle by increasing the feeding voltage (see, for example, Patent Document 1).

  This regeneration / expiration prevention method will be described. FIG. 9 shows a cooperative operation relationship between the electric vehicle and the power storage device. The left side of the figure shows the regenerative current narrowing characteristic of the electric vehicle. When the feeding voltage of the electric vehicle (or the voltage of the capacitor C of the electric vehicle filter) is equal to or higher than a specified value, the regenerative current is changed from 100% to 0 accordingly. By restricting to% regeneration, the feeding voltage is prevented from rising excessively. In the figure, in a DC1500V electric vehicle, when the feeding voltage is DC1700V or less, the aperture ratio is 1.0 (diaphragm amount 0%), and when DC1800V or more, the aperture ratio is 0 (diaphragm amount 100%), between 1700V and 1800V The aperture ratio is linearly reduced to 0 in proportion to the voltage to suppress the regenerative current. The surplus regenerative power due to the narrowing of the regenerative current is absorbed by the mechanical brake. Note that the regenerative current narrowing control may be limited by the regenerative current increase rate.

  The right side of FIG. 9 shows the drooping characteristic of the charging voltage of EDLC (power storage medium). EDLC, for example, has a working voltage range of 500V to 1280V, an EDLC voltage of up to 1100V (point A) and a feeding voltage of up to 1650V, and a feeding voltage of 1650V (charging start voltage) or more. The EDLC charging voltage value is increased at a constant slope as the voltage increases, and when the EDLC voltage is charged up to 1280 V, a drooping characteristic is set such that the charging start voltage is 1830 V as the feeding voltage. By having such drooping characteristics, it is possible to recover the regenerative current efficiently in the power storage device, and to enable reliable revocation by the regenerative current narrowing function of the electric vehicle.

  With reference to FIG. 10, the cooperation operation | movement by the electric vehicle and electric power storage apparatus shown in FIG. 9 is demonstrated. For the sake of simplicity, it is assumed that there is no other electric vehicle load or other train regeneration, and the electric vehicle being regenerated and the power storage device are in a one-to-one relationship. Further, the electric resistance of feeders and the like is set to 0, and the state in which the electric vehicle is regenerated and the power storage device absorbs (charges) the resulting line current is assumed to be “during regenerative absorption operation”.

First, the EDLC capacity corresponds to the regenerative energy of the electric vehicle so that the drooping characteristic does not operate in the normal single regenerative absorption operation (the point A in FIG. 9 and the operation start voltage V _{A in} FIG. 10 does not reach 1100 V). Select the capacity.

  Next, in FIGS. 9 and 10, the power storage device during line absorption operation performs charge / discharge control (steady state control) of EDLC so that the feeding voltage becomes about 1650V in the range of EDLC voltage from 500V to 1100V. Do. At this time, the regenerative current of the electric vehicle is not reduced, or the electric vehicle is regenerated almost 100% without the regenerative drawing operation.

  Next, in FIG. 9 and FIG. 10, when the EDLC voltage range is 1100 V or more and the regenerative absorption operation is being performed, the feeding voltage is raised according to the EDLC voltage. In the power storage device during regenerative absorption operation, the feeding voltage rises, so the feeding voltage of the regenerative electric car connected by the feeder also rises with the EDLC voltage rise of the power storage unit . Further, when the regenerative absorption of the power storage device proceeds and the EDLC voltage exceeds 1150 V in FIG. 10, the feeding voltage exceeds 1700 V, so the feeding voltage applied to the electric vehicle also exceeds 1700 V. Then, the regenerative current restricting function shown in FIG. If “electric car regenerative current> absorbed current of power storage device” is satisfied, the electric voltage rises according to the amount not absorbed and the regenerative current is further reduced on the train side.

  Further, when the regenerative absorption operation proceeds and the EDLC voltage rises to 1250V, the feeding voltage becomes 1800V, and the feeding current applied to the electric vehicle becomes 1800V and the regenerative current = 0. That is, before the EDLC reaches a full charge of 1280 V, the regenerative current of the electric vehicle can be set to zero. This means that the electric vehicle regenerative current = 0 before the power storage device is fully charged and stops the regenerative absorption operation.

  Such regenerative expiration prevention control prevents overcharging of the EDLC beyond the full charge voltage without providing regenerative power absorption load resistance equipment in the DC system and without increasing the capacity of the EDLC. In addition to protecting against electric current, the regenerative current limiting function of the electric car prevents the electric car from regenerating and revoking.

JP 2007-106186 A

  The conventional device prevents regenerative invalidation by coordinating the regenerative current narrowing control function of the electric vehicle and the drooping characteristic control function of the power storage medium. In this regeneration / expiration prevention control, when the EDLC voltage is equal to or higher than the charge start voltage (point A), the charge start voltage is increased according to the EDLC voltage to increase the feeding voltage. This electric voltage rise causes the electric vehicle to start the regenerative throttle operation, and the regenerative current decreases. As a result, the regenerative current of the electric vehicle can be reduced to zero without causing the EDLC to become an overvoltage and the electric vehicle feeding voltage (panter voltage) to become an overvoltage.

  However, when feeding voltage increase control according to the EDLC voltage is performed, hunting may occur due to regenerative throttle operation of the electric vehicle and charging voltage control based on the drooping characteristics of the power storage device. An example of this hunting will be described with reference to FIG.

(S1) Due to the drooping characteristic, the feeding voltage of the electric vehicle also increases with the increase of the EDLC voltage, so that the regenerative current is reduced from I ₁ to I ₂ by the regenerative throttle operation of the electric vehicle.

(S2) By reducing the regenerative current, the internal resistance _REDLC and the voltage ΔV = (I ₁ −I ₂ ) due to the decrease in the regenerative current and the _feeders and circuit components from the electric vehicle to the power storage device during the regenerative operation Control for reducing the charging voltage of EDLC is executed only by R _EDLC .

(S3) The voltage is decreased from V ₂ to V ₁ by a decrease ΔV of the charging voltage of EDLC, and the charging start voltage of the power storage device is decreased from V _2ref ′ to V _1ref ′.

(S4) When the charging start voltage decreases from V _2ref ′ to V _1ref ′, the regenerative throttle amount of the electric vehicle decreases, and the regenerative current increases from I ₂ to I ₄ .

(S5) Due to the increase of the regenerative current, the voltage drop ΔV due to the internal resistance R _EDLC increases, the control to increase the charging voltage of the EDLC is started, the process proceeds to the above (S1), and the regenerative current restriction starts again.

  The occurrence of such hunting results in an unstable regenerative throttle control on the electric vehicle side, and an unstable braking operation due to vibration of the motor current. On the power storage device side, the EDLC charge / discharge operation is repeatedly performed, which affects the life of the EDLC and increases the DC / DC power conversion loss due to the bidirectional chopper.

  An object of the present invention is to provide a power storage device for a DC electric railway that can prevent hunting caused by charging voltage control of a power storage medium by regenerative throttle operation and drooping characteristics of an electric vehicle, and can perform stable regeneration control. is there.

  In order to solve the above-mentioned problem, the present invention maintains a maximum voltage of the power storage medium during regenerative absorption (during charging of the power storage medium) and reflects it in the drooping characteristics, or regenerative absorption of the power storage medium during regenerative absorption. There is no restriction on the voltage rise, but for the voltage drop of the power storage medium during regenerative absorption, the reflection to the drooping characteristic is to restrict the voltage decrease rate of the power storage medium and gradually reduce it. Thus, it is characterized by the following configuration.

(1) an electric vehicle having a regenerative current narrowing control function;
A power storage device comprising a power storage medium and a DC / DC converter, and connected in parallel to the electric vehicle through a feeder line and rail of a DC electric railway;
The charging / discharging voltage of the electric power storage medium is controlled based on the deviation from the electric voltage detection value Vdc when the feeding reference voltage Vdcref, and during the charging of the electric power storage medium, charging of the regenerative current from the electric vehicle proceeds, When the voltage of the power storage medium EDLC becomes equal to or higher than the charging start voltage V _A , the charging voltage of the power storage device is increased with a drooping characteristic corresponding to the regenerative current narrowing characteristic of the electric vehicle. In a DC electric railway power storage device equipped with a control device that prevents regeneration invalidity by increasing the amount of regeneration current throttle of the car,
The control device includes:
When the feed voltage detection value Vdc is between the charge start voltage and the full charge voltage of the power storage medium, a feed reference voltage Vdcref corresponding to the drooping characteristic is generated, and the voltage of the power storage medium is absorbed during absorption of the regenerative current. When the voltage decreases, the maximum voltage value Vedlc (max) of the power storage medium from the start of charging to the present is held, and when the voltage of the power storage medium decreases, the maximum voltage value Vedlc (max) is used as the feeding reference. A feeding reference voltage generating means for outputting the voltage Vdcref is provided.

(2) an electric vehicle having a regenerative current narrowing control function;
A power storage device comprising a power storage medium and a DC / DC converter, and connected in parallel to the electric vehicle through a feeder line and rail of a DC electric railway;
The charging / discharging voltage of the electric power storage medium is controlled based on the deviation from the electric voltage detection value Vdc when the feeding reference voltage Vdcref, and during the charging of the electric power storage medium, charging of the regenerative current from the electric vehicle proceeds, When the voltage of the power storage medium EDLC becomes equal to or higher than the charging start voltage V _A , the charging voltage of the power storage device is increased with a drooping characteristic corresponding to the regenerative current narrowing characteristic of the electric vehicle. In a DC electric railway power storage device equipped with means for preventing regeneration invalidation by increasing the amount of regeneration current throttle of the car,
The control device includes:
When the feed voltage detection value Vdc is between the charge start voltage and the full charge voltage of the power storage medium, a feed reference voltage Vdcref corresponding to the drooping characteristic is generated, and the voltage of the power storage medium is absorbed during absorption of the regenerative current. When the voltage decreases, the maximum voltage value Vedlc (max) of the power storage medium from the start of charging to the present is reduced and held by a constant value ΔV for each feeding reference voltage generation period or feeding voltage control period, In the state where the voltage of the power supply voltage decreases, the power supply voltage generating means outputs the held voltage value as the power supply reference voltage Vdcref.

  As described above, according to the present invention, the regenerative throttle of an electric vehicle and the power storage device are configured to maintain the maximum voltage of the power storage medium and reflect it in the drooping characteristics during regenerative absorption (during charging of the power storage medium). Hunting is eliminated in preventing regenerative expiration due to cooperation due to the drooping characteristics of the electric vehicle, the electric vehicle can stably regenerate, and the power storage device can also stably and efficiently absorb regeneration.

  In addition, there is no restriction on the voltage increase of the power storage medium during regenerative absorption, but the drop in the drooping characteristic constrains the voltage decrease rate of the power storage medium for the voltage drop of the power storage medium during regenerative absorption. In addition, since the mode is gradually lowered, not only the hunting of the electric vehicle and the power storage device can be suppressed, but also the capacity of the power storage medium can be used for regenerative absorption with little waste.

The control block diagram of the electric power storage apparatus which shows embodiment of this invention. The processing procedure of the feeding reference voltage generation unit in the first embodiment. 5 is a control waveform of a feeding reference voltage Vdcref in the first embodiment. 9 shows a processing procedure of a feeding reference voltage generation unit according to the second embodiment. 7 is a control waveform of a feeding reference voltage Vdcref in the second embodiment. Fig. 2 is a feeding circuit diagram of a DC electric railway. The structural example of an electric power storage apparatus. Control mode of bidirectional chopper. Explanatory drawing of cooperation operation | movement of an electric vehicle and an electric power storage apparatus. Explanatory drawing of the cooperation operation | movement by an electric vehicle and an electric power storage apparatus. An example of hunting that occurs between an electric vehicle and a power storage device.

(Embodiment 1)
FIG. 1 is a control block diagram of the power storage device according to the present embodiment, and the feeding voltage is controlled by charge / discharge control of EDLC by a bidirectional chopper. In addition, the detection value of each part is detected by the detectors 15-18 shown in FIG. 7, for example.

  In FIG. 1, the charging / discharging voltage control means of the power storage medium obtains a deviation between the feeding voltage detection value Vdc detected by the feeding voltage detector and the feeding reference voltage value Vdcref by the deviation unit 21, and the deviation unit The normalization calculation unit 22 divides the deviation output of 21 by the rated value to obtain a normalized calculation output value (for example, when the rated voltage is 2000 V and the input voltage is 1000 V, the normalized calculation output value is 0.5). obtain. This output value is subjected to proportional integration calculation by the voltage control PI amplifier 23 and limited by the limiter 24 to obtain a charging current command value of the EDLC 12.

  The deviation unit 25 obtains a deviation between the charge current command value and the charge current detection value of the EDLC 12, and obtains a PI control output that determines the duty of the bidirectional chopper 12 by performing a proportional integral calculation with the deviation by the current control PI amplifier 26. . This PI control output is used as a duty ratio command value of the chopper control unit 27 and obtained as a chopper gate signal to the chopper control unit 27, and the charging current and voltage of the EDLC 12 are controlled by the on / off control of the bidirectional switch 11.

  As shown in FIG. 9, the feeding reference voltage generating unit 28 has a drooping characteristic from a drooping characteristic start voltage (1100 V in the figure) above the charging start voltage (point A) to an EDLC full charge voltage (1280 V in the figure). A corresponding power supply reference voltage Vdcref is generated. As a result, the EDLC charging voltage is controlled to increase as the feeding voltage Vdc increases due to the regenerative current, and efficient regenerative current recovery and regenerative invalidation in the electric vehicle are prevented.

  Here, the feeding reference voltage generating unit 28 starts charging when the EDLC voltage decreases during absorption of the regenerative current in addition to the means for generating the feeding reference voltage Vdcref having the above drooping characteristics. A generating means for holding (latching) the EDLC maximum voltage from the current to the present as a feeding reference voltage and reflecting it in the drooping characteristic is provided.

  This generation means adjusts the feeding reference voltage Vdcref according to the processing procedures (S11) to (S16) shown in FIG. 2 realized by software by the controller of the DC / DC converter.

  (S11) It is determined whether or not regenerative absorption is in progress (EDLC charging is in progress).

  (S12) When the EDLC is being charged, it is determined whether or not the detected EDLC voltage value Vedlc (det) exceeds the EDLC charging voltage maximum value Vedlc (max) up to now.

  (S13) The current EDLC charge voltage detection value Vedlc (det) is updated as the EDLC charge voltage maximum value Vedlc (max) up to now.

  (S14) When the EDLC charge voltage detection value Vedlc (det) is lower than the current EDLC charge voltage maximum value Vedlc (max) in the determination of the above process (S12), the EDLC charge voltage maximum value Vedlc (current) max) is held (latched).

  (S15) The EDLC charging voltage maximum value Vedlc (max) updated in the above process (S13) or the EDLC charging voltage maximum value Vedlc (max) latched in the process (S14) is used as the feeding reference voltage Vdcref. Output.

  (S16) When charging of EDLC is completed in the above process (S11), the charging voltage detection value Vedlc (det) is held as the current charging voltage maximum value Vedlc (max).

  Control of the feeding reference voltage Vdcref according to the processing procedure shown in FIG. 2 has the control waveform shown in FIG. In the figure, the solid line is the detected value, and the broken line is the feeding reference voltage. 3A shows waveforms of the EDLC voltage detection value Vedlc (det) and the EDLC charging voltage maximum value Vedlc (max), and FIG. 3B shows drooping characteristics of the feeding reference voltage Vdcref.

In FIG. 3, at time t1, the EDLC voltage is below the charging start voltage, the EDLC voltage detection value Vedlc (det) is at the voltage V ₁ below the point A, and the feeding reference voltage Vdcref1 also matches the current detection value. To do.

At time t2, but is increased to a voltage V ₂ by drooping characteristic EDLC voltage exceeds the charge starting voltage (A point), also feeding circuit reference voltage Vdcref2 matches the current detection value.

  At time t3, when the feeding voltage is also controlled to be high due to the rise to the feeding reference voltage Vdcref2, as described above, the regenerative current throttling function of the electric vehicle works, and due to the presence of the internal resistance, the EDLC voltage detection value Vedlc ( det) is less than or equal to the maximum EDLC charge voltage value Vedlc (max). At this time, the held EDLC charging voltage maximum value Vedlc (max) is output as the feeding reference voltage Vdcref3, and the electric vehicle side increases the throttle ratio of the regenerative current without decreasing the regenerative throttle control start voltage (to 1). The regenerative control is held as it is.

At time t4, EDLC charging voltage at the regeneration control by time t2 of the large regenerative current increases up to V _4, EDLC voltage detection value Vedlc (det) is increased to the same level as the EDLC charging voltage maximum value Vedlc (max) The EDLC charging voltage control is returned to the original drooping characteristic, and charging of the EDLC with the regenerative current by the electric vehicle is started.

At time t5, when the EDLC charging voltage V ₅ becomes high up to the full charge voltage EDLC, the regenerative current drawing ratio in the electric vehicle side is lowered toward zero suppresses the regenerative current. After this, surplus regenerative electric power due to regenerative current narrowing is absorbed by the mechanical brake.

  Therefore, according to the present embodiment, the EDLC maximum voltage is maintained during regenerative absorption (during EDLC charging), and the charging voltage of the EDLC is reduced by the voltage ΔV due to the decrease in the regenerative current in the regenerative throttle operation of the electric vehicle. Sometimes, by maintaining the EDLC charging voltage at the maximum value, there is no hunting in the EDLC charging control due to the electric vehicle regenerative throttle and drooping characteristics, the electric vehicle performs stable regeneration, and the power storage device also absorbs stable regeneration. It can be performed.

(Embodiment 2)
FIG. 4 shows a processing procedure of the feeding reference voltage generation unit 28 according to the present embodiment. 4 is different from FIG. 2 in the following process (S17).

  (S17) When the EDLC charge voltage detection value Vedlc (det) is lower than the current EDLC charge voltage maximum value Vedlc (max) in the determination of the process (S12), the EDLC charge voltage maximum value Vedlc (max) up to the present Is reduced by a constant value ΔV and held (latched). This process is executed every feeding reference voltage generation period or feeding voltage control period (for example, 1 ms), and the EDLC voltage reduction rate is restricted and gradually lowered with respect to the EDLC voltage drop during regenerative absorption. For example, the constant value ΔV is set to a slope of 10 V / second, and the current value of the EDLC charging voltage maximum value Vedlc (max) is decreased.

The control of the feeding reference voltage Vdcref according to the processing procedure shown in FIG. 4 has the control waveform shown in FIG. In the figure, the solid line is the detected value, and the broken line is the feeding reference voltage. In FIG. 5, at time t1, the EDLC voltage is below the charging start voltage, the EDLC voltage detection value Vedlc (det) is at the voltage V ₁ below the point A, and the feeding reference voltage Vdcref1 also matches the current detection value. To do.

At time t2, but is increased to a voltage V ₂ by drooping characteristic EDLC voltage exceeds the charge starting voltage (A point), also feeding circuit reference voltage Vdcref2 matches the current detection value.

At time t3, when the feeding voltage is also controlled to be high due to the rise to the feeding reference voltage Vdcref2, as described above, the regenerative current throttling function of the electric vehicle works, and due to the presence of the internal resistance, the EDLC voltage detection value Vedlc ( det) is less than or equal to the maximum EDLC charge voltage value Vedlc (max). At this time, a value obtained by subtracting the held maximum EDLC charge voltage value Vedlc (max) by the voltage decrease ΔV is updated as the maximum EDLC charge voltage value Vedlc (max). As a result, the decrease in the EDLC voltage detection value Vedlc (det) from the voltage V ₂ to V ₃ is reduced, and accordingly, the gradient of the feeding reference voltage becomes gentle.

At time t4, EDLC charging voltage is increased up to V ₄ in the regenerative control by the gradual regeneration current after the time t2, EDLC voltage detection value Vedlc (det) EDLC is reduced at a constant gradient charging voltage maximum value Vedlc (max EDLC charging voltage control is restored to the original drooping characteristic, and charging of the EDLC with the regenerative current by the electric vehicle is started.

At time t5, when the EDLC charging voltage V ₅ becomes high up to the full charge voltage EDLC, the regenerative current drawing ratio in the electric vehicle side is lowered toward zero suppresses the regenerative current. After this, surplus regenerative electric power due to regenerative current narrowing is absorbed by the mechanical brake.
Therefore, according to the present embodiment, when the Vedlc voltage starts to decrease during regeneration (charging), ΔV is subtracted from the Vedlc voltage in the measurement cycle, a new Vedlc (max) is set, and the feeding reference voltage is set to Reduce.

  In the first embodiment, when the regenerative current becomes a voltage at which the regenerative current = 0 by the electric vehicle regenerative stop during the regenerative absorption, the EDLC voltage is reduced by the voltage drop due to the internal resistance, and there is still power for charging. In the present embodiment, by gently reflecting the EDLC voltage drop in the drooping characteristics, not only the hunting of the electric vehicle and the power storage device can be suppressed, but also the EDLC capacity can be used for regenerative absorption with little waste.

DESCRIPTION OF SYMBOLS 100 Electric power storage apparatus 200 Electric vehicle 11 Bidirectional chopper 12 EDLC (electric power storage medium)
DESCRIPTION OF SYMBOLS 19 Control apparatus 21, 25 Deviation part 22 Normalization calculating part 23 Voltage control PI amplifier 24 Limiter 26 Current control PI amplifier 27 Chopper control part 28 Feeding reference voltage generation part

Claims (2)

An electric vehicle having a regenerative current narrowing control function;
A power storage device comprising a power storage medium and a DC / DC converter, and connected in parallel to the electric vehicle through a feeder line and rail of a DC electric railway;
The charging / discharging voltage of the electric power storage medium is controlled based on the deviation from the electric voltage detection value Vdc when the feeding reference voltage Vdcref, and during the charging of the electric power storage medium, charging of the regenerative current from the electric vehicle proceeds, When the voltage of the power storage medium EDLC becomes equal to or higher than the charging start voltage V _A , the charging voltage of the power storage device is increased with a drooping characteristic corresponding to the regenerative current narrowing characteristic of the electric vehicle. In a DC electric railway power storage device equipped with a control device that prevents regeneration invalidity by increasing the amount of regeneration current throttle of the car,
The control device includes:
When the feed voltage detection value Vdc is between the charge start voltage and the full charge voltage of the power storage medium, a feed reference voltage Vdcref corresponding to the drooping characteristic is generated, and the voltage of the power storage medium is absorbed during absorption of the regenerative current. When the voltage decreases, the maximum voltage value Vedlc (max) of the power storage medium from the start of charging to the present is held, and when the voltage of the power storage medium decreases, the maximum voltage value Vedlc (max) is used as the feeding reference. A power storage device for a DC electric railway comprising feeding reference voltage generating means for outputting the voltage as Vdcref. An electric vehicle having a regenerative current narrowing control function;
A power storage device comprising a power storage medium and a DC / DC converter, and connected in parallel to the electric vehicle through a feeder line and rail of a DC electric railway;
The charging / discharging voltage of the electric power storage medium is controlled based on the deviation from the electric voltage detection value Vdc when the feeding reference voltage Vdcref, and during the charging of the electric power storage medium, charging of the regenerative current from the electric vehicle proceeds, When the voltage of the power storage medium EDLC becomes equal to or higher than the charging start voltage V _A , the charging voltage of the power storage device is increased with a drooping characteristic corresponding to the regenerative current narrowing characteristic of the electric vehicle. In a DC electric railway power storage device equipped with means for preventing regeneration invalidation by increasing the amount of regeneration current throttle of the car,
The control device includes:
When the feed voltage detection value Vdc is between the charge start voltage and the full charge voltage of the power storage medium, a feed reference voltage Vdcref corresponding to the drooping characteristic is generated, and the voltage of the power storage medium is absorbed during absorption of the regenerative current. When the voltage decreases, the maximum voltage value Vedlc (max) of the power storage medium from the start of charging to the present is reduced and held by a constant value ΔV for each feeding reference voltage generation period or feeding voltage control period, A power storage device for a DC electric railway, comprising feeding reference voltage generating means for outputting the held voltage value as the feeding reference voltage Vdcref in a state where the voltage of the power supply is lowered.

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