JP6423741B2 - Power conversion device, power conversion device control method, and electric vehicle - Google Patents

Description

  The present invention relates to a power conversion device, a control method for the power conversion device, and an electric vehicle.

  An electric railway vehicle (electric vehicle) is generally equipped with a current collector that collects power sent from a substation via an overhead line (overhead current collection), and is operated by the power collected by the current collector. . In addition to overhead line current collection, to handle both electrified and non-electrified sections, or to absorb assist power when power from substations is insufficient and regenerative power from vehicle motors In addition, vehicles equipped with power storage elements such as storage batteries and capacitors are also being studied.

  There are various systems as a circuit system that uses the overhead line current collector and the storage element in combination. For example, Non-Patent Document 1 discloses a DC voltage circuit that supplies an input voltage to an inverter or an auxiliary power supply device that drives a main motor for driving / braking a vehicle in a circuit configuration in which an overhead wire and a storage element are connected in parallel. (Hereinafter, referred to as an intermediate circuit) and an overhead line and a power converter (hereinafter referred to as scheme 1), and a power converter that is provided between the intermediate circuit and a storage element (hereinafter referred to as scheme) 2).

  Further, in Non-Patent Document 2, a power conversion device is provided between the current collector and the intermediate circuit in order to cope with a plurality of overhead line voltages (overhead voltage), and between the intermediate circuit and the storage element. A method of providing a power converter (charge / discharge power converter) for controlling the charge / discharge current is described.

Takamitsu Yamamoto et al., Research and development of non-electrified section direct-current vehicles, Proceedings of the 2013 IEEJ Industrial Applications Conference, Volume 6, p18-21 Akira Murashima et al., LH02 overhead wire hybrid LRV electrical equipment for the Railway Technical Research Institute, Toyo Denki Technical Bulletin 117, p18-23, 2008

  According to the power conversion device provided between the intermediate circuit and the overhead line in the system 1 of Non-Patent Document 1, charge / discharge control of the storage element cannot be performed. Moreover, according to the power conversion device provided between the intermediate circuit and the storage element in the method 2 of Non-Patent Document 1, when traveling on a plurality of overhead line routes or traveling on an AC overhead section I can't respond.

  According to the method described in Non-Patent Document 2, a power conversion device is provided between the current collector and the intermediate circuit, so that the vehicle travels on a plurality of overhead voltage lines or travels on an AC overhead wire section. It becomes possible to deal with cases. In addition, by providing a power conversion device between the intermediate circuit and the power storage element, it is possible to charge and discharge the power acquisition element.

  However, the power conversion device is generally expensive and has a large volume and weight. In a vehicle equipped with a power storage element, restrictions are large because the volume and weight of the power storage element are large, and weight reduction is required to save travel energy in a non-electrified section.

  If two power conversion devices are mounted as in the method described in Non-Patent Document 2, the cost, weight, and size increase.

  The object of the present invention is to solve the above-mentioned problems, and in an electric vehicle using both an overhead wire current collector and an electricity storage element, while suppressing an increase in cost, weight, and size, an overhead wire current collection and charge / discharge control of the electricity storage element are performed. An object of the present invention is to provide a power conversion device, a method for controlling the power conversion device, and an electric vehicle that can be performed.

  In order to solve the above-described problem, a power conversion device according to the present invention is mounted on an electric vehicle that includes a power storage element, a load, and an intermediate circuit that is connected to the power storage element and the load and holds a DC voltage. And the intermediate circuit, and converts the voltage of the overhead line into a direct current voltage different from the voltage of the overhead line and holds it in the intermediate circuit, the power storage device and the intermediate circuit And a control unit that controls current or power input / output to / from the overhead line in response to a charge / discharge current command that indicates a current value of a charge / discharge current flowing between the power line and the overhead line.

  Further, in the power conversion device according to the present invention, the power conversion device can control an intermediate circuit voltage, which is a voltage held in the intermediate circuit, according to a current or power input / output to / from the overhead wire. And the control unit generates an intermediate circuit voltage command indicating an intermediate circuit voltage such that the charge / discharge current matches the charge / discharge current command, and the intermediate circuit is generated according to the generated intermediate circuit voltage command. It is preferable to control the voltage.

  Further, in the power conversion device according to the present invention, the control unit receives the detection value of the charge / discharge current, and feedback controls a deviation between the input detection value of the charge / discharge current and the charge / discharge current command. It is preferable to amplify and generate the intermediate circuit voltage command.

  Further, in the power conversion device according to the present invention, the control unit outputs the intermediate circuit voltage command based on a storage voltage of the storage element and a voltage drop due to a resistance component between the storage element and the intermediate circuit. It is preferable to produce.

  Further, in the power conversion device according to the present invention, the control unit receives the detection value of the charge / discharge current, and feedback controls a deviation between the input detection value of the charge / discharge current and the charge / discharge current command. The first intermediate circuit voltage command is amplified to generate a second intermediate circuit voltage command based on the storage voltage of the power storage element and a voltage drop due to a resistance component between the power storage element and the intermediate circuit. Preferably, the intermediate circuit voltage command is generated according to the generated first intermediate circuit voltage command and the second intermediate circuit voltage command.

  Further, in the power conversion device according to the present invention, the controller is input / output between the overhead line based on a charge / discharge power command for instructing a charge / discharge power of the power storage element and a load power by the load. It is preferable to generate a collected power command for instructing power to be generated and to control power input / output to / from the overhead line according to the generated collected power command.

  Further, in the power conversion device according to the present invention, the control unit includes a detection value of a collected current flowing between the overhead line and the power conversion device, a storage voltage of the storage element, and a detection value of the charge / discharge current. The charge / discharge power of the power storage element is calculated based on the storage voltage of the power storage element and the detected value of the charge / discharge current, and the detected value of the collected current and the voltage on the overhead line side of the power converter are indicated Preferably, the collected power input / output from / to the overhead line is calculated based on the voltage command to be performed, and the load power is estimated based on the calculated charge / discharge power and collected power.

  Further, in the power conversion device according to the present invention, the intermediate circuit that indicates the intermediate circuit voltage at which the charge / discharge current that flows according to the difference between the intermediate circuit voltage and the storage voltage of the storage element matches the charge / discharge current command Electric power that generates a voltage command, generates a first collected power command that controls electric power that is input to and output from the overhead line, and charges and discharges the storage element in accordance with the generated intermediate circuit voltage command A second collected power command is generated based on the charge / discharge power command instructing the load and the load power by the load, and according to the generated first collected power command and the second collected power command It is preferable to generate a collected power command and control power input / output to / from the overhead line in accordance with the generated collected power command.

  In order to solve the above problem, a method for controlling a power conversion device according to the present invention includes an electric storage device, a load, and an intermediate circuit that is connected to the electric storage device and the load and holds a DC voltage. A method for controlling a power conversion device, which is provided between the overhead line and the intermediate circuit, converts the voltage of the overhead line into a DC voltage different from the voltage of the overhead line and holds the DC voltage in the intermediate circuit. And a step of controlling a current or power input / output to / from the overhead line in response to a charge / discharge current command indicating a current value of a charge / discharge current flowing between the power storage element and the intermediate circuit.

  Moreover, in order to solve the said subject, the electric vehicle which concerns on this invention mounts one of the power converter devices mentioned above.

  According to the power conversion device, the power conversion device control method, and the electric vehicle according to the present invention, it is possible to perform overhead wire current collection and charge / discharge control of the storage element while suppressing an increase in cost, weight, and size.

It is a figure which shows the structure of the electric vehicle which concerns on the 1st Embodiment of this invention. It is a block diagram which shows the structure of the control part shown in FIG. It is a block diagram which shows the structure of the control part which concerns on the 2nd Embodiment of this invention. It is a block diagram which shows the structure of the control part which concerns on the 3rd Embodiment of this invention. It is a block diagram which shows the structure of the control part which concerns on the 4th Embodiment of this invention. It is a block diagram which shows the structure of the control part which concerns on the 5th Embodiment of this invention. It is a block diagram which shows the principal part structure of the control part which concerns on the 6th Embodiment of this invention.

  Embodiments of the present invention will be described below.

(First embodiment)
FIG. 1 is a diagram showing a configuration of an electric vehicle 1 according to the first embodiment of the present invention.

  An electric vehicle 1 shown in FIG. 1 includes a current collector 2, a power conversion device 3, an intermediate circuit 4, a reactor 5, a storage element 6, and a variable voltage variable frequency (VVVF) inverter (hereinafter referred to as an inverter). 7 and an auxiliary power supply device (SIV: static inverter) 8.

  The current collector 2 is connected to a substation and other trains via an overhead line 10 (a DC overhead line or an AC overhead line), which is a power supply medium for transferring power to and from the substation and other electric vehicles (trains). Send and receive power to and from.

  The power conversion device 3 is provided between the current collector 2 and the intermediate circuit 4. The power converter 3 has a converter unit (not shown) that converts the overhead wire voltage (DC voltage or AC voltage) acquired from the overhead wire 10 via the current collector 2 into a DC voltage different from the overhead wire voltage. Then, the DC voltage after conversion is held in the intermediate circuit 4. The return current from the converter portion flows to the rail 12 via the wheel 11 of the electric vehicle 1.

The power conversion device 3 can control the intermediate circuit voltage V _c by controlling the current or power input / output to / from the overhead wire 10 via the current collector 2. Therefore, the power conversion device 3 controls the voltage V between the connection line with the current collector 2 and the connection line with the wheel 11 (hereinafter, sometimes referred to as the voltage V on the overhead line 10 side). 34 and a control unit 30 that controls the operation of the power conversion circuit 34. Details of the control unit 30 will be described later.

The intermediate circuit 4 has a capacitor 41. The positive electrode and the negative electrode of the capacitor 41 are connected to the power conversion device 3, the storage element 6, the inverter 7, and the SIV 8, respectively. The voltage from the power conversion device 3 (intermediate circuit voltage V _c ) is held by the capacitor 41, and power is supplied to the inverter 7 and SIV8. Further, the storage element 6 is charged and discharged via the intermediate circuit 4.

Reactor 5 has one end connected to the positive electrode of capacitor 41 and the other end connected to power storage element 6. Reactor 5, operates as a filter for removing an unnecessary component of the charge and discharge current I _b flowing between the intermediate circuit 4 and the power storage device 6.

  The storage element 6 is an element that can be charged and discharged, such as a storage battery or a capacitor.

  The inverter 7 converts the DC voltage supplied from the intermediate circuit 4 into an AC voltage and supplies the AC voltage to a main motor (not shown) for driving and braking the electric vehicle 1.

  The SIV 8 converts the DC voltage supplied from the intermediate circuit 4 into a voltage for a fluorescent lamp, an air conditioner, a controller, etc. in the electric vehicle 1 and supplies the converted voltage.

In the electric vehicle 1 shown in FIG. 1, when the intermediate circuit voltage V _c is higher than the storage voltage V _b of the power storage element 6, the charging current I _b is applied in the direction (positive direction) from the intermediate circuit 4 toward the power storage element 6. As a result, the storage element 6 is charged. On the other hand, when the intermediate circuit voltage V _c is lower than the storage voltage V _b of the storage element 6, the charging current I _b flows in the direction (negative direction) from the storage element 6 toward the intermediate circuit 4. Is done. That is, charging / discharging of the electrical storage element 6 can be controlled by controlling the intermediate circuit voltage V _c with the power conversion device 3. Normally, the intermediate circuit 4 is provided for supplying a constant DC voltage to a load such as the inverter 7 or the SIV 8. In the present invention, the intermediate circuit voltage V _c is controlled for charge / discharge control of the storage element 6. Therefore, it would be intermediate circuit voltage V _c changes, the change in the intermediate circuit voltage V _c by the charge and discharge control of power storage device 6 is a size that does not affect the operation of the inverter 7 and SIV8.

In the present embodiment, the power converter 3 (the control unit 30), the charge and discharge current charge and discharge current command to instruct the current value of Ib I _b ^* is input, the charge and discharge current I _b is the charge and discharge current command I _b ^The intermediate circuit voltage V _c is controlled so as to match ^* .

  Next, the configuration of the control unit 30 will be described.

  FIG. 2 is a block diagram illustrating a configuration of the control unit 30 according to the present embodiment.

  The control unit 30 illustrated in FIG. 2 includes a charge / discharge current controller 31, an intermediate circuit voltage controller 32, a current collection current controller 33, and a power conversion circuit 34.

The control unit 30 includes a detected value of the charging / discharging current I _b, a detected value of the intermediate circuit voltage V _c, a detected value of the collected current I _p flowing between the current collector 2 and the power converter 3, The charge / discharge current command I _b ^* is input.

Discharge current controller 31, the charge and discharge current I _b and the discharge current command I _b ^* difference between a proportional integral amplification (PI control) to generate an intermediate circuit voltage command V _c ^*. In the PI control, the sum of the proportional amplification and integral amplification of the difference between the charge / discharge current I _b and the charge / discharge current command I _b ^* is output as the intermediate circuit voltage command V _c ^* . For this reason, even when the charge / discharge current _Ib and the charge / discharge current command _Ib ^* match, the proportionally amplified difference between the charge / discharge current _Ib and the charge / discharge current command _Ib ^* is zero. A product obtained by integrating and amplifying the difference between the discharge current I _b and the charge / discharge current command I _b ^* is not zero because there is a value integrated so far. Therefore, even when the charge / discharge current I _b and the charge / discharge current command I _b ^* coincide with each other, the intermediate circuit voltage command V _c ^* has a value.

Intermediate circuit voltage controller 32, a deviation between the intermediate circuit voltage command V _c ^* and the intermediate circuit voltage V _c proportional integral amplification, to produce a collector current command I _p ^* which instructs the collector current I _p.

The collected current controller 33 proportionally integrates and amplifies the deviation between the collected current command I _p ^* and the collected current I _p and generates a voltage command V ^* that indicates the voltage V on the overhead line 10 side.

The power conversion circuit 34 controls the voltage V on the overhead line 10 side, that is, the current or power input / output to / from the overhead line 10 according to the voltage command V ^* .

According to the control unit 30 shown in FIG. 2, the voltage V on the overhead wire 10 side is controlled so that the charge / discharge current I _b and the charge / discharge current command I _b ^* coincide with each other. A current collection current I _p corresponding to the voltage V on the overhead line 10 flows between the current collector 2 and the power converter 3, and as a result, the intermediate circuit voltage V _c changes. Then, a charge / discharge current I _b corresponding to the difference between the intermediate circuit voltage V _c and the storage voltage V _b of the storage element 6 flows, and charge / discharge control of the storage element 6 is performed.

For example, when the voltage V on the overhead wire 10 side is controlled so that the current collection current I _p flows in the direction from the current collector 2 to the power converter 3, the intermediate circuit voltage V _c increases, and as a result, the intermediate circuit voltage V _{When c} becomes higher than the storage voltage V _{b of the} storage element 6, the charge / discharge current I _b flows in a direction from the intermediate circuit 4 toward the storage element 6, and the storage element 6 is charged. On the other hand, when the voltage V on the overhead wire 10 side is controlled so that the current collection current I _p flows in the direction from the power converter 3 to the current collector 2, the intermediate circuit voltage V _c decreases, and as a result, the intermediate circuit voltage V _{When c} becomes lower than the storage voltage V _{b of} the storage element 6, the charge / discharge current I _b flows in the direction from the storage element 6 toward the intermediate circuit 4, and the storage element 6 is discharged.

As described above, according to the present embodiment, the power conversion device 3 is provided between the overhead wire 10 (the current collector 2) and the intermediate circuit 4, and is a charge / discharge current that flows between the storage element 6 and the intermediate circuit 4. depending on the charge and discharge current command I _b ^* for instructing a current value of I _b, to control the current or power input and output between the overhead line 10.

  Therefore, the power conversion device 3 can convert the overhead line voltage to hold the DC voltage in the intermediate circuit 4 and can perform charge / discharge control of the power storage element 6. Therefore, it is not necessary to separately provide a power conversion device for performing charge / discharge control of the power storage element 6, and thus an increase in cost, weight, and size of the electric vehicle can be suppressed.

In the present embodiment, the example in which the intermediate circuit voltage controller 32 generates the collected current command I _p ^* , that is, the example in which current control is performed has been described, but the present invention is not limited to this. The intermediate circuit voltage controller 32 may generate a collected power command that instructs the collected power exchanged between the current collector 2 and the power converter 3. In this case, the collected current controller 33 generates a voltage command V ^{* based} on the deviation between the collected power command and the collected power.

(Second Embodiment)
FIG. 3 is a block diagram showing the configuration of the control unit 30a according to the second embodiment of the present invention. 3, the same components as those in FIG. 2 are denoted by the same reference numerals, and description thereof is omitted. The control unit 30a according to the present embodiment differs from the control unit 30 according to the first embodiment in the generation method of the intermediate circuit voltage command V _c ^* .

  The control unit 30a shown in FIG. 3 differs from the control unit 30 shown in FIG. 2 in that the charge / discharge current controller 31 is changed to a voltage drop calculator 35.

The voltage drop calculator 35 calculates a voltage drop due to a resistance component between the intermediate circuit 4 and the storage element 6. That is, the voltage drop calculator 35 multiplies the resistance component R between the intermediate circuit 4 and the storage element 6 by the charge / discharge current command _Ib and outputs the multiplication result. In addition, the resistance component R between the intermediate circuit 4 and the electrical storage element 6 is calculated | required previously, for example.

Here, when the value of the resistance component between the intermediate circuit 4 and the storage element 6 is R, the following expression (1) is established.
I _b = (V _c −V _b ) / R (1)

If the storage voltage V _b and the resistance component R are known from the equation (1), the intermediate circuit voltage command V _c ^* can be generated. Therefore, the intermediate circuit voltage command V _c ^* can be generated by the following formula (2) using the charge / discharge current command I _b ^* from the formula (1).
V _c ^* = R × I _b ^* + V _b (2)

Therefore, as shown in FIG. 3, the sum of the output of the voltage drop calculator 35 (the multiplication value of the resistance component between the intermediate circuit 4 and the storage element 6 and the charge / discharge current command I _b ) and the storage voltage V _b. Thus, the intermediate circuit voltage command V _c ^* is generated.

As described above, according to the present embodiment, the control unit 30a determines the intermediate circuit voltage command based on the storage voltage _Vb of the storage element 6 and the voltage drop due to the resistance component R between the storage element 6 and the intermediate circuit 4. V _c ^* is generated.

In the first embodiment, the intermediate circuit voltage command V _c ^* is generated by proportional-integral amplification of the deviation between the charge / discharge current I _b and the charge / discharge current command I _b ^* . In this case, it takes time for the intermediate circuit voltage command V _c ^* to converge. On the other hand, in the present embodiment, amplification of the deviation is not necessary, so that the time required for generating the intermediate circuit voltage command V _c ^* can be shortened.

(Third embodiment)
FIG. 4 is a block diagram showing the configuration of the control unit 30b according to the third embodiment of the present invention. 4, the same components as those in FIGS. 2 and 3 are denoted by the same reference numerals, and description thereof is omitted. The control unit 30b according to the present embodiment generates a method for generating the intermediate circuit voltage command V _{c in} the control unit 30 according to the first embodiment and the intermediate circuit voltage command V _c ^* by the control unit 30a according to the second embodiment. The intermediate circuit voltage command V _c ^* is generated in combination with the generation method.

  The control unit 30b shown in FIG. 4 is different from the control unit 30 shown in FIG. 2 in that a voltage drop calculator 35 is added.

As described above, the control unit 30b according to this embodiment, the intermediate circuit voltage by the control unit 30a according to the generation method of the second embodiment of the intermediate circuit voltage command V _c of the control unit 30 according to the first embodiment a combination of a command V _c ^* generation method to generate an intermediate circuit voltage command V _c ^*.

That is, the charge / discharge current controller 31 proportionally integrates and amplifies the deviation between the charge / discharge current I _b and the charge / discharge current command I _b ^* to generate the first intermediate circuit voltage command. The voltage drop calculator 35 calculates a voltage drop due to a resistance component between the intermediate circuit 4 and the storage element 6. Then, the output of the voltage drop calculator 35 and the stored voltage _Vb are added to generate a second intermediate voltage command.

According to the controller 30b according to the present embodiment, as shown in FIG. 3, the intermediate circuit voltage command (first intermediate circuit voltage command) generated by the charge / discharge current controller 31 and the voltage drop calculator 35 The intermediate circuit voltage command (second intermediate circuit voltage command) generated by adding the output and the storage voltage V _b is added to generate an intermediate circuit voltage command V _c ^* .

According to this embodiment, the control unit 30b includes a first intermediate circuit voltage command generated by amplifying the charge-discharge current Ib and charging and discharging current command I _b ^* and the deviation of the power storage of the power storage device 6 The intermediate circuit voltage command V _c ^* is generated according to the voltage V _b and the second intermediate circuit voltage command generated based on the voltage drop due to the resistance component R between the storage element 6 and the intermediate circuit 4.

As described above, according to the intermediate circuit voltage command V _c ^* generation method according to the second embodiment, it is possible to shorten the intermediate circuit voltage command V _c ^* time required to generate the. However, if there is an error in the detected value of the storage voltage V _b or the value of the resistance component R between the intermediate circuit 4 and the storage element 6, an error occurs in the charge / discharge current I _b . In particular, the resistance component R is preferably as small as possible to reduce the loss, and is a minute value. Therefore, it is difficult to grasp an accurate value, which greatly affects the control performance.

Therefore, as in the present embodiment, by combining the method for generating the intermediate circuit voltage command V _c ^* according to the first embodiment and the method for generating the intermediate circuit voltage command V _c ^{* according} to the second embodiment, Even when an error occurs in the charge / discharge current I _b due to an error such as the value of the resistance component R, the error is caused by the intermediate circuit voltage command (first intermediate circuit voltage command) generated by the charge / discharge current controller 31. Can be corrected.

(Fourth embodiment)
In the first to third embodiments, charging / discharging of the electric storage element 6 is controlled using the intermediate circuit voltage command V _c ^* . However, in this case, a control delay occurs and there is a problem in responsiveness. In the present embodiment, charging / discharging of the storage element 6 is controlled using power input / output between the current collector 2 and the power converter 3.

  FIG. 5 is a block diagram illustrating a configuration of the control unit 30c according to the present embodiment.

  The control unit 30c shown in FIG. 5 is different from the control unit 30 shown in FIG. 2 in that the charge / discharge current controller 31 and the intermediate circuit voltage controller 32 are deleted and a converter 36 is added. .

The following relationship is established between the charge / discharge power P _b charged and discharged by the storage element 6, the load power P _l, and the collected power P _p collected from the overhead line 10.
P _p = P ₁ −P _b (3)

Incidentally, the load power P _l is an inverter 7 and SIV8, the sum of the input and output power of the load connected to the intermediate circuit 4. The load power P _l is grasped in advance by the control unit 30 c by signal communication between the load such as the inverter 7 and SIV 8 and the power conversion device 3.

Charge-discharge electric power P _b is determined by the product of the power storage voltage V _b and the discharge current I _b. Therefore, as shown in FIG. 5, the charge / discharge power command P _b ^* can be calculated from the product of the charge / discharge current command I _b ^* and the stored voltage V _b . From the formula (3), the collected power command P _p ^* can be obtained by subtracting the charge / discharge power command P _b ^* from the load power P _l .

The converter 36 generates a collected current command I _p ^* based on the voltage command V ^* and the collected power command P _p ^* generated by the collected current controller 33. Then, the deviation between the collected current command I _p ^* and the collected current I _p is proportionally integrated and amplified by the collected current controller 33 to generate the voltage command V ^* .

As described above, according to the present embodiment, the control unit 30c generates the collected power command P _p ^* based on the charge / discharge power command P _b ^{* of the} power storage element 6 and the load power P _l, and generates the collected power The collected power Pp is controlled according to the electric power command P _p ^* .

Since the collected power command P _p ^* is generated based on the charge / discharge power command P _b ^* and the load power P _l , it can be obtained at high speed. Therefore, it is possible to suppress the occurrence of control delay compared to the case where the intermediate circuit voltage command V _c ^* is used.

(Fifth embodiment)
As described above, in the fourth embodiment, the load power P _l is the signal communication between the load and the power converter 3, such as an inverter 7 and SIV8, it has been grasped in advance in the control unit 30c. However, when the load and difficult signal communication between the electric power converter 3, the control unit 30c of the load power P _l is difficult to grasp.

Therefore, the control unit according to the present embodiment includes a load power estimation unit that estimates the load power _Pl shown in FIG.

  6 includes a filter 371. The load power estimation unit 37 illustrated in FIG.

As described above, between the load power P _l and the charge-discharge power P _b and the collector power P _p is related as shown in Equation (3). The collected power P _p is a product of the voltage command V ^* and the collected current I _p . Moreover, charge-discharge electric power P _b is the product of the power storage voltage V _b and the discharge current I _b.

Therefore, as shown in FIG. 6, the load power estimation unit 37 multiplies the voltage command V ^* and the collected current Ip. Further, the storage voltage V _b and the charge / discharge current I _b are multiplied. Then, the multiplication value of voltage command V ^* and current collection current I _p and the multiplication value of storage voltage V _b and charging / discharging current I _b are added and input to filter 371. Since the intermediate circuit 4 includes the capacitor 41, an estimation error occurs due to a transient response.

Therefore, the filter 371 reduces an error due to a transient response by cutting a high frequency with respect to the input. The output of the filter 371 is the load power _Pl shown in FIG. 5, and the deviation from the charge / discharge power command Pb _* is calculated.

According to this embodiment, the control unit 30c includes a voltage command V ^*, and the current collector current I _p, a power storage voltage V _b, based on the charge and discharge current I _b, to estimate the load power P _l .

Therefore, even when signal communication between the power conversion device 3 and the load is difficult, the load power P _l is estimated, and the collected current I _p can be controlled using the estimated load power P _l .

(Sixth embodiment)
In the fourth and fifth embodiments described above, there is a problem that an error occurs in the charge / discharge current I _b if there is an error in the load power _Pl or the calculation of the converter 36. Therefore, in this embodiment, the fourth or the fifth embodiment, since the first combination of the third embodiment, thereby suppressing the error of the charge and discharge current I _b.

  FIG. 7 is a block diagram showing a configuration of a control unit 30d according to the sixth embodiment of the present invention.

  The control unit 30d shown in FIG. 7 is different from the control unit 30c shown in FIG. 5 in that a charge / discharge current controller 31 and an intermediate circuit voltage controller 32 are added. That is, the control unit 30d is configured by combining the control unit 30c shown in FIG. 5 and the control unit 30 shown in FIG.

In the control unit 30d shown in FIG. 7, the charge / discharge current controller 31 generates an intermediate circuit voltage command V _c ^* by proportionally integrating and amplifying the deviation between the charge / discharge current I _b and the charge / discharge current command I _b ^*. . The intermediate circuit voltage controller 32 proportionally integrates and amplifies the deviation between the intermediate circuit voltage command V _c ^* and the intermediate circuit voltage V _c to generate a first collected power command P _pfb ^* . In the first embodiment, the intermediate circuit voltage controller 32 generates the collected current command I _p ^* , but may generate the collected power command as described above.

Further, the charge / discharge current command I _b ^* and the storage voltage V _b are multiplied to generate a charge / discharge power command P _b ^* . Further, the second collected power command P _pff ^* is generated by subtracting the charge / discharge power command P _b ^* from the load power P _l .

Then, the first collected power command P _pfb ^* and the second collected power command P _pff ^* are added to generate a collected power command P _p ^{*, which} is input to the converter 36.

According to this embodiment, the control unit 30d generates a charge-discharge current I _b is the charge and discharge current command I _b intermediate circuit voltage command instructs the intermediate circuit voltage V _c that matches ^* V _c ^*, A first collected power command P _pfb ^* is generated according to the generated intermediate circuit voltage command V _c ^* . Further, the control unit 30d generates a second collected power command P _pff ^* based on the charge / discharge power command P _b ^* and the load power P _l . Then, the control unit 30d generates a collected power command P _p ^{* according} to the generated first collected power command P _pfb ^* and the second collected power command P _pff ^*, and generates the collected collected power The collected power is controlled according to the command P _p ^* .

Therefore, even if an error in the calculation of the load power P _l and transducer 36 occurs, it is possible to correct the error by the first of the first collector power command P _pfb ^*, the error in the charge and discharge current I _b Can be prevented from occurring.

  In addition, in this embodiment, although demonstrated using the example which combines the control part 30 which concerns on 1st Embodiment shown in FIG. 2 with the control part 30c which concerns on 4th Embodiment shown in FIG. It is not limited to this. The control units 30, 30a, 30b according to the first to third embodiments and the control unit 30c according to the fourth or fifth embodiment may be appropriately combined.

In the above-described embodiment, the intermediate circuit voltage command V _c ^* , the collected current command I _p , the voltage command V ^{*, and the} like have been described using an example in which proportional integration (PI) amplification is used. It is not limited to. Instead of proportional integral amplification, feedback control such as proportional (P) amplification, proportional integral derivative (PID) amplification, or the like may be used.

  Although the present invention has been described based on the drawings and embodiments, it should be noted that those skilled in the art can easily make various variations or modifications based on the present disclosure. Therefore, it should be noted that these variations or modifications are included in the scope of the present invention. For example, functions included in each block or the like can be rearranged so that there is no logical contradiction, and a plurality of blocks can be combined into one or divided.

DESCRIPTION OF SYMBOLS 1 Electric vehicle 2 Current collector 3 Power converter 4 Intermediate circuit 5 Reactor 6 Power storage element 7 VVVF inverter 8 SIV
DESCRIPTION OF SYMBOLS 10 Overhead wire 11 Wheel 12 Rail 30,30a, 30b, 30c, 30d Control part 31 Charge / discharge controller 32 Intermediate circuit voltage controller 33 Current collecting current controller 34 Power conversion circuit 35 Voltage drop calculator 36 Converter 37 Load power estimation Part 371 filter

Claims (10)

The battery is mounted on an electric vehicle including a storage element, a load, and an intermediate circuit that is connected to the storage element and the load and holds a DC voltage, and is provided between the overhead line and the intermediate circuit. , A power conversion device for converting into a DC voltage different from the voltage of the overhead wire and holding it in the intermediate circuit,
A control unit that controls current or power input / output to / from the overhead line according to a charge / discharge current command that indicates a current value of a charge / discharge current flowing between the power storage element and the intermediate circuit; The power converter characterized by this. The power conversion device according to claim 1,
The power converter is capable of controlling an intermediate circuit voltage, which is a voltage held in the intermediate circuit, according to a current or power input / output to / from the overhead line,
The control unit generates an intermediate circuit voltage command that instructs an intermediate circuit voltage such that the charge / discharge current matches the charge / discharge current command, and the intermediate circuit voltage is set according to the generated intermediate circuit voltage command. The power converter characterized by controlling. The power conversion device according to claim 2,
The control unit receives the charge / discharge current detection value, amplifies a deviation between the input charge / discharge current detection value and the charge / discharge current command by feedback control, and generates the intermediate circuit voltage command. The power converter characterized by doing. The power conversion device according to claim 2,
The said control part produces | generates the said intermediate circuit voltage command based on the electrical storage voltage of the said electrical storage element, and the voltage drop by the resistance component between the said electrical storage element and the said intermediate circuit. The power conversion device according to claim 2,
The control unit receives a detection value of the charge / discharge current, amplifies a deviation between the input detection value of the charge / discharge current and the charge / discharge current command by feedback control, and outputs a first intermediate circuit voltage command. Generating a second intermediate circuit voltage command based on a storage voltage of the storage element and a voltage drop due to a resistance component between the storage element and the intermediate circuit, and generating the generated first intermediate circuit A power conversion device that generates the intermediate circuit voltage command in accordance with a voltage command and a second intermediate circuit voltage command. The power conversion device according to claim 1,
The control unit generates a collected power command for instructing power input / output to / from the overhead line based on a charge / discharge power command for instructing charge / discharge power of the power storage element and load power by the load And the electric power converter characterized by controlling the electric power input / output between the said overhead wires according to this produced | generated collected electric power instruction | command. The power conversion device according to claim 6, wherein
The control unit receives a detected value of a collected current flowing between the overhead wire and the power converter, a stored voltage of the power storage element, and a detected value of the charge / discharge current, and the stored voltage of the power storage element and the The charge / discharge power of the electricity storage element is calculated based on the detected value of the charge / discharge current, and between the overhead wire based on the voltage value indicating the detected value of the current collection current and the voltage on the overhead line side of the power converter. A power converter that calculates the collected power to be input / output and estimates the load power based on the calculated charge / discharge power and the collected power. The power conversion device according to claim 1,
An intermediate circuit voltage command for indicating an intermediate circuit voltage at which the charging / discharging current flowing according to the difference between the intermediate circuit voltage, which is a voltage held in the intermediate circuit, and the storage voltage of the power storage element matches the charge / discharge current command, Generate a first current collection power command for controlling power input / output to / from the overhead line according to the generated intermediate circuit voltage command, and instruct the power to be charged / discharged to the storage element A second collected power command is generated based on the charge / discharge power command and load power by the load, and current collection is performed according to the generated first collected power command and second collected power command. A power conversion device that generates a power command and controls power input to and output from the overhead line in accordance with the generated collected power command. Mounted in an electric vehicle including an electric storage element, a load, and an intermediate circuit connected to the electric storage element and the load and holding a DC voltage, provided between the overhead line and the intermediate circuit, the voltage of the overhead line is , A method for controlling a power converter for converting to a DC voltage different from the voltage of the overhead wire and holding it in the intermediate circuit,
Power conversion including a step of controlling current or power input / output to / from the overhead wire in response to a charge / discharge current command that indicates a current value of a charge / discharge current flowing between the power storage element and the intermediate circuit Control method of the device.   The electric vehicle carrying the power converter device of any one of Claims 1-8.

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