JP4814825B2 - Hybrid power system - Google Patents

Description

  The present invention relates to a hybrid power supply system mounted on an overhead wire hybrid train or the like.

An overhead hybrid train is an electric vehicle that can travel while supplying electric power necessary for driving simultaneously from an overhead line and an in-vehicle power storage device, and that can store electrical energy generated during braking in the power storage device. . The power supply system in such a hybrid train controls the direct current power from the battery with a chopper circuit to control the discharging and charging of the battery (see, for example, Patent Document 1).
JP 2006-340561 A

  However, when the voltage of the overhead line becomes lower than the output voltage of the battery, such as when passing through a section or when an electric vehicle running near is running, the overhead line is reversely pressurized by the power of this battery. There was a problem of being done.

  The present invention has been made in view of such problems, and an object of the present invention is to provide a hybrid power supply system that operates normally regardless of the overhead line voltage.

In order to solve the above-described problem, the hybrid power supply system according to the present invention is configured such that the power collected by the current collector from the overhead line to which either the first voltage or the second voltage lower than the first voltage is applied. a second voltage or more is converted to an intermediate circuit voltage load (e.g., induction motor 7a etc. in the embodiment) and the first power supply circuit for supplying the (e.g., the overhead wire side power supply circuit 2 in the embodiment), the And a chopper circuit that converts the second voltage output from the battery into an intermediate circuit voltage (for example, the battery-side step-up / step-down chopper circuit 40 in the embodiment), and a first power supply circuit action of the second power supply circuit for supplying power of a battery connected to the load in parallel (e.g., a battery-side power supply circuit 3 in the embodiment), the first power supply circuit and the second power supply circuit Anda controller for controlling the first power supply circuit has a first output terminal and a second input and output ends, intermediate the first voltage input from the second input and output terminals A step- up / step-down chopper for converting to a circuit voltage and outputting from the first input / output terminal, converting a second voltage input from the first input / output terminal to an intermediate circuit voltage and outputting from the second input / output terminal circuit (e.g., the overhead wire side buck-boost chopper circuit 20 in the embodiment) and, current collector is connected to the second input and output terminals, the first state, the collector load is connected to the first input-output terminal A second state in which the device is connected to the first input / output terminal and a load is connected to the second input / output terminal , and a third state in which the current collector and the first power supply circuit are disconnected and switching means for switching, voltage detecting means for detecting a voltage of the overhead line, which is applied to the current collector (e.g., in the embodiment Kicking includes a overhead wire side first voltage detector 18), a controller, a voltage sensed by the voltage sensing means, the switching means when in a predetermined range including a first voltage first When the voltage detected by the voltage detection means is within a predetermined range including the second voltage, the switching means is controlled to the second state, and the voltage detected by the voltage detection means When it is not within the range, the switching means is controlled to the third state .

In such a hybrid power supply system according to the present invention, the switching means is an interrupter that intermittently connects the current collector and the first power supply circuit (for example, the first high-speed circuit breaker 11 and the first and second disconnectors in the embodiment). Current collectors 12 and 13b), a first contactor that intermittently connects the current collector and the second input / output terminal (for example, the first contactor 15 in the embodiment), the current collector and the first input / output. A second contactor that interrupts the end (for example, the second contactor 16 in the embodiment), and a third contactor that intermittently connects the first input / output end and the load (for example, the third contact in the embodiment) . 25 ) and a fourth contactor (for example, the fourth contactor 26 in the embodiment) for intermittently connecting the second input / output terminal and the load, and the controller is detected by the voltage detecting means. When the voltage is within a predetermined range including the first voltage, The first contactor and the third contactor are connected, and the second contactor and the fourth contactor are disconnected, and the voltage detected by the voltage detection means includes a predetermined voltage including the second voltage. When it is within the range, the first contactor and the third contactor are disconnected, and the interrupter, second contactor and fourth contactor are connected and detected by the voltage detection means. When the voltage is not within the predetermined range, the interrupter is preferably disconnected .

  When the hybrid power supply system according to the present invention is configured as described above, even if the voltage of the current collector decreases, the voltage of the battery is not applied to the current collector by controlling the switching means, and it is safe. Can be operated.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. First, the configuration of the hybrid power supply system according to the present invention will be described with reference to FIG. This hybrid power supply system 1 is mounted on an electric vehicle that travels on a rail R, and uses a DC power supplied from a trolley wire T by a DC feeding system and a battery in combination for driving induction motors 7a, 7b, 8a, 8b and a load 9 such as an air conditioner, and a first drive for supplying AC power to the overhead power supply circuit 2, the battery power supply circuit 3, and the two induction motors 7a and 7b connected in parallel. Inverter circuit 4, a second drive inverter circuit 5 for supplying AC power to two induction motors 8a and 8b connected in parallel, and a static inverter circuit for supplying AC power to a load 9 (auxiliary power supply device) 6).

  The overhead wire side power supply circuit 2 includes, in order from the trolley wire T side, a current collector (pantograph) 10, a first high-speed circuit breaker 11, a first current breaker 12, and a first current limiting resistor connected in parallel. 13a and the 2nd circuit breaker 13b, and the filter reactor 14a and the 3rd circuit breaker 14b connected in parallel are connected in series. One end of the first contactor 15 and the second contactor 16 connected in parallel is connected to the output end side of the filter reactor 14a and the third disconnector 14b connected in parallel. The ground line G1 is connected to the rail R via the wheel 17, and the overhead line side first voltage detector 18 is connected by connecting the pantograph 10 and the ground line G1, and the first and second contactors 15 and 16 are connected. An overhead wire side second voltage detector 19 is connected to one end side and the ground line G.

  Between the other end side of the first contactor 15 and the ground line G1, three sets of circuits configured by connecting a series of semiconductor switching elements and freewheel diodes connected in parallel were connected in parallel. An overhead wire side step-up / down chopper circuit 20 is connected. In addition, a first contactor group 21 having three contactors is connected to the other end side of the second contactor 16, and each of these contactors connects each of the three first smoothing reactors 22. The intermediate point of the three sets of circuits constituting the overhead wire side step-up / step-down chopper circuit 20 (the connection point of the set of semiconductor switch elements and freewheel diodes connected in parallel, 20a). The first filter capacitor 23 is connected by connecting the other end of the second contactor 16 and the ground line G1.

  A second filter capacitor 24 is connected between the output end 20b of the overhead wire side step-up / step-down chopper circuit 20 and the ground line G, and a fourth contactor is connected to the output end 20b of the overhead line side step-up / step-down chopper circuit 20. One end of 26 is connected. Further, the third contactor 25 is connected by connecting the other end of the fourth contactor 26 and the other end of the second contactor 16.

  On the other hand, the battery-side power circuit 3 includes a battery module 32 including a battery 30 and a wiring circuit breaker 31, a second high-speed circuit breaker 33, a fifth current breaker 34, and a second connected in parallel. A current limiting resistor 35a and a fourth current breaker 35b are connected in series. A battery-side voltage detector 36 and a second filter capacitor 37 are connected in parallel between the output terminals of the second current limiting resistor 35a and the fourth circuit breaker 35b and the ground line G2.

  Furthermore, one end of a second contactor group 38 having three contactors is connected to the output end sides of the second current limiting resistor 35a and the fourth current breaker 35b. The end is connected to the input end of the battery-side step-up / step-down chopper circuit 40 via three second smoothing reactors 39. A fifth filter capacitor 41 and a third voltage detector 42 are connected between the output end of the battery side step-up / down chopper circuit 40 and the ground line G2.

  The output ends of the overhead line side power supply circuit 2 and the battery side power supply circuit 3 are connected to each other, and ground lines G1 and G2 are connected. The output ends and the ground lines G1 and G2 are connected to the first and second drive terminals. Inverter circuits 4 and 5 and a stationary inverter circuit 6 are connected in parallel. In addition, between the output ends of the overhead wire side power supply circuit 2 and the battery side power supply circuit 3 and the first and second drive inverter circuits 4 and 5 and the stationary inverter circuit 6, fifth to seventh contacts are respectively provided. Devices 50, 51 and 52 are connected. An LC filter 53 is connected between the static inverter circuit 6 and the load 9.

  FIG. 2 shows the first and second high-speed circuit breakers 11, 33, the first to third circuit breakers 12, 13b, 14b, the first to seventh contactors 15, 16, 25, 26, 50 to 52, the overhead wire side step-up / step-down chopper circuit 20, the battery side step-up / step-down chopper circuit 40, and the controller 60 that controls the operation thereof are shown. The controller 60 uses, for example, a battery operation switch panel 70 installed in a driver's cab as an input / output interface, and the overhead line side first and second voltage detectors 18 and 19, the battery side voltage detector 36, and the third These contactors and the like are controlled based on detected values from the voltage detector 42 and a battery management device 30b (described later) of the battery module 32. The controller 60 is actually composed of a plurality of circuits, but here, it is expressed as a single block. The controller 60 also controls the operation of the first and second inverter circuits 4 and 5 and the stationary inverter circuit 6, which are omitted in FIG. Further, FIG. 3 shows an external appearance of the battery operation switch panel 70.

  In the hybrid power supply system 1 according to the present embodiment described above, the controller 60 controls the operation of the overhead wire side and battery side step-up / step-down chopper circuits 20 and 40 and the contactor so that power is simultaneously supplied from the trolley wire T and the battery module 32. In addition to being able to be supplied, the electric energy generated by the induction motors 7a, 7b, 8a and 8b during braking can be stored in the battery module 32. Now, the details of the hybrid power supply system 1 according to this embodiment will be described.

  First, the configuration of the battery module 32 of the battery side power supply circuit 3 will be described. As shown in FIG. 4, the battery module 32 has, for example, a predetermined number (eight in this embodiment) of single cells 30a, which are lithium ion secondary batteries, connected in series, and has an automatic trip function at the time of abnormality at the high potential side terminal. A circuit breaker 31 for wiring is connected. The battery modules 32 are configured by connecting a plurality of rows (four rows in this embodiment) in parallel (only one row is shown in FIG. 1) to obtain a desired voltage (600 V) and energy capacity (120 Ah). It is configured to be able to.

  A battery management device 30b is connected to each single cell 30a of the battery 30, and each cell voltage and total voltage are monitored by the battery management device 30b. When the circuit breaker 31 for wiring is turned on, that is, when a battery circuit is configured, the battery group insertion indicator lamp 71a of the battery operation switch panel 70 is lit by the battery management device 30b via the controller 60. When the wiring circuit breaker 31 is opened due to battery abnormality or manual operation, the battery group insertion indicator lamp 71a of the corresponding group is turned off.

  Further, the battery module 32 is provided with overcharge and overdischarge protection functions by the battery management device 30b. Note that when the power supply of the battery management device 30b itself is cut off, the circuit breaker 31 for wiring is automatically opened, and the battery main circuit is not configured unless the battery management device 30b operates. When the battery management device 30b determines that the single cell 30a is in an overcharge (or overdischarge) state, the battery management device 30b transmits a notice signal to the controller 60 as a signal. Specifically, when even one single cell 30a whose terminal voltage is lower than the lower limit value is generated, an “overdischarge notice signal” is transmitted, and conversely, even one single cell 30a whose terminal voltage is higher than the upper limit value is generated. Then, an “overcharge notice signal” is transmitted. The controller 60 turns on the overcharge notice display lamp 71b or the overdischarge notice display lamp 71c of the battery operation switch panel 70 in response to these notice signals. When the crew member recognizes the lighting of the indicator lights 71b and 71c, the crew member can perform a powering notch lowering operation and an operation of the quick charge OFF switch 72 provided on the battery operation switch panel 70.

  Further, the battery operation switch panel 70 is provided with a battery emergency cutoff switch 73. When an abnormality is detected during traveling, stopping, rapid charging, or the like, the crew member sets the battery emergency cutoff switch 73. When operated, the controller 60 is configured to trip the circuit breaker 31 and disconnect the battery circuit (all blocks) from the main circuit.

  In the hybrid power supply system 1 according to the present embodiment, three systems of automatic opening protection of the battery unit 32 are provided. The first system is protection by the battery management device 30b. When any one of the cell overvoltage, cell undervoltage, and total overvoltage reaches the threshold as described above, the battery management device 30b has an abnormal cell. The circuit breaker 31 for wiring of the battery block (battery unit 32) is configured to trip. The battery management device 30b also monitors the temperature of the single cell 30a to be managed, and is configured to trip the circuit breaker 31 in the same manner when this temperature becomes an abnormal temperature.

The second system is protection by a charger / discharger. As shown in FIG. 5, the battery side power supply circuit 3 is provided with a charger / discharger 60a (a part of the controller 60), and the electric power supplied from the trolley wire T and the induction motors 7a, 7b, 8a, The battery unit 32 is charged using the electric power generated in 8b, and on the contrary, the electric power of the battery unit 32 is supplied to the induction motors 7a, 7b, 8a, 8b and the like. The charger / discharger 60a monitors the total voltage of the battery module 32 by the battery-side voltage detector 36. When the total voltage deviates from a predetermined voltage, the charge / discharger 60a The circuit breaker 34 is opened and all the battery modules 32 are released from the main circuit. In addition, when the charging / discharging current of the battery module 32 exceeds the operation set value of the second high speed circuit breaker 33, the second high speed circuit breaker 33 is configured to automatically trip.

  The third system is protection by an operation command circuit. When the quick charge ON switch 72 of the battery operation switch panel 70 is operated, a timer provided in the controller 60 is activated, and the controller 60 automatically enters an emergency shut-off state when a set time such as 1 minute elapses. The circuit breakers 31 for wiring are opened all at once. When the battery module 32 causes a high-resistance ground fault and a ground fault current flows through the battery module 32, the value is close to the value at the time of normal quick charge, so it cannot be determined and cannot be normally protected. Is.

  Next, a driving operation when driving the vehicle will be described. The hybrid power supply system 1 according to the present embodiment includes an overhead wire side step-up / down chopper circuit 20 provided in the overhead wire side power supply circuit 2 and the first to fourth contactors 15, 16, 25, and 26 even when the overhead wire voltage is zero. In addition to a safe configuration without reverse application, the battery unit 32 can be charged with any of the overhead line voltages of 1500V, 750V, and 600V. In other words, the DC overhead line 1500V system, the DC overhead line 600V system (including 750V), and traveling by voltage selection in three modes of battery traveling are configured. Which of these three modes is selected is set by the crew using a mode changeover switch 74 provided on the battery operation switch panel 70.

The controller 60 opens and closes the first to fourth contactors 15, 16, 25, and 26 according to the travel mode selected by the mode switch 74. Specifically, as shown in FIG. 6, in the 600V mode, the first and third contactors 15 and 25 are opened, the second and fourth contactors 16 and 26 are closed, and the DC power from the trolley wire T is applied. Is input from the input terminal 20a of the overhead wire side step-up / down chopper circuit 20 and output from the output terminal 20b. On the contrary, in the 1500V mode, the second and fourth contactors 16 and 26 are opened, the first and third contactors 15 and 25 are closed, and the DC power from the trolley wire T is supplied to the overhead wire side step-up / down chopper circuit 20. Input from the output terminal 20b and output from the input terminal 20a. Thus, the input / output direction of the DC power to the overhead wire side step-up / step-down chopper circuit 20 can be switched by controlling the opening / closing of the first to fourth contactors 15, 16, 25, 26, and the overhead wire voltage is 600V. However, even 1500V can be handled. In the battery mode, the first to fourth contactors 15, 16, 25, and 26 are all opened.

  As described above, the overhead line side first voltage detector 18 for detecting the overhead line voltage is provided between the current collector 10 and the first high-speed circuit breaker 11, and the controller 60 selects the selected voltage. It is determined whether or not it is within the range of the overhead wire detection voltage according to the mode (300 to 900 V when the 600 V mode is selected, or a predetermined value such as 1000 to 1900 V when the 1500 V mode is selected). The controller 60 only includes the first high-speed circuit breaker 11, the first circuit breaker 12, the second circuit breaker 13b, the first to fourth contactors 15, 16, when the overhead wire detection voltage is within a predetermined range. 25 and 26 and the fifth contactor 50 and the sixth contactor 51 for operating the drive inverter circuits 4 and 5 can be turned on, and the main circuit is configured.

  When the overhead wire detection voltage is out of the predetermined range, the drive circuit is configured by the battery mode selection and can travel (the fifth contactor 50 and the sixth contactor 51 can be turned on). At this time, the first high-speed breaker 11, the first breaker 12, the second breaker 13b, and the first to fourth contactors 15, 16, 25, and 26 on the overhead line side are not charged.

  When the 1500V mode or the 600V mode is selected and the electric vehicle passes through the section during power running or regeneration of the overhead line hybrid traveling, the overhead line side detection voltage detected by the overhead line side first voltage detector 18 is increased. When deviating from the predetermined voltage range, the controller 60 stops the operation of the overhead wire side step-up / down chopper circuit 20 so that the overhead wire (trolley wire T) is not reversely pressurized by the power from the battery module 32, and the overhead wire side power supply circuit 2. The first to fourth contactors 15, 16, 25, and 26 (actually, the combination of the first and third contactors 15, 25, or the combination of the second and fourth contactors 16, 26) are opened. .

  When the first to fourth contactors 15, 16, 25, 26 are opened by the controller 60, the first and second drive inverter circuits 4, 5 are connected to the battery module 32 via the battery side power supply circuit 3. Is supplied or regenerated, and the vehicle can continue running in the power running operation or the regenerative operation. When the controller 60 detects power recovery by the overhead wire side first voltage detector 18, the controller 60 again inserts the corresponding contactors of the first to fourth contactors 15, 16, 25 and 26, and the overhead wire side step-up / down chopper circuit. 20 is activated to return to the original control state. When the overhead wire side detection voltage exceeds the circuit protection level, a lightning arrester (not shown) operates and at the same time, the first high-speed circuit breaker 11 is opened instantaneously.

  On the other hand, when a power failure occurs in the overhead line while traveling in the overhead line hybrid mode, the overhead line side detection voltage detected by the overhead line side first voltage detector 18 deviates from the predetermined voltage range, and the same control as the above section passing is performed by the controller. 60. At this time, if the deviation time of the overhead wire detection voltage exceeds a predetermined value such as 10 seconds, it can be determined that it is caused by overhead power failure, overhead wire high resistance ground fault, no overhead wire section entry, intended pantograph descent, The controller 60 opens the first high-speed circuit breaker 11, the first circuit breaker 12, and the second circuit breaker 13b, and stops the operations of the first and second drive inverter circuits 4 and 5.

  As described above, when the first high-speed circuit breaker 11 or the like is opened, the vehicle enters a coasting state, and even if the notch is turned on again after the notch is turned off, the overhead wire detection voltage is out of the predetermined range, so that power running and regeneration are not accepted. At this time, the crew can stop by the friction brake, and can be handled in the same manner as a general electric vehicle by entering a coasting state at the time of a power failure.

  On the other hand, when it is desired to continue running even in an overhead power failure, a non-overhead section, or a pantograph descending state, the crew changes the mode switch 74 of the battery operation switch panel 70 to the battery mode. By this operation, the contactor group of the overhead wire side power supply circuit 2 is opened, and at the same time, the first and second drive inverter circuits 4 and 5 can be operated, and by the power from the battery unit 32 of the battery side power supply circuit 3 It is possible to continue running. That is, the operation of switching the mode changeover switch 74 by the crew member to the battery mode has a meaning of confirming the intention to continue running in the no-voltage state. In the above description, the contactor opening / closing control by the controller 60 is summarized as shown in FIG.

  Thus, by providing the overhead wire side step-up / step-down chopper circuit 20 in the overhead wire side power supply circuit 2 and controlling the opening and closing of the first to fourth contactors 15, 16, 25, 26, regardless of the overhead wire voltage, the input side The uncontrollable current does not flow to any of the output sides. In addition, the same circuit configuration as that of the conventional step-up / step-down chopper circuit is possible, and a direct battery connection configuration is also possible.

  In addition, as described above, the 600V battery-equipped electric vehicle can be hybrid-operated under the 600V overhead line, and the overhead hybrid control of the 1500V, 750V, 600V overhead line and 600V battery, or only the 600V battery can be directly driven by the inverter. High efficiency operation can be realized by minimizing the semiconductor loss of the current path at each voltage.

  By the way, when such a hybrid power supply system 1 is provided in an electric vehicle, it travels between the stations in a battery mode, and the current collector 10 is laid on the trolley line T (limited to the station premises when the station stops at the station). The battery unit 32 can be quickly charged to store the electric power for traveling to the next station. Therefore, a case where quick charging is performed will be described.

  First, the quick charge start is handled. After traveling in the battery mode, the current collector (pantograph) 10 is raised at the charging station, and the mode changeover switch 74 is set to a direct current 1500V system or a direct current 600V system. Perform the operation to switch to. Then, when the overhead line detection voltage detected by the overhead line side first voltage detector 18 is within a predetermined range, the controller 60 detects the first high speed circuit breaker 11, the first breaker 12, and the second breaker. 13b and two contactors out of the first to fourth contactors 15, 16, 25, and 26 corresponding to the selected voltage mode are inserted (this state is the same as the overhead hybrid mode).

  And if a crew member operates quick charge ON switch 72 provided in battery operation switch panel 70, controller 60 will light a quick charge ON indicator lamp (not shown) provided in the cab. At this time, the controller 60 closes the third contactor 14b and short-circuits the filter reactor 14a provided in the front stage of the overhead wire side step-up / down chopper circuit 20 to constitute a main circuit for rapid charging (the filter reactor is on the charging station side). Provided). In addition, since the fifth and sixth contactors 50 and 51 provided in the front stage of the first and second drive inverter circuits 4 and 5 are opened, it is not possible for the crew to run even if the notch is accidentally inserted. Become. Note that immediately after the quick charge ON switch 72 is operated, the charger / discharger 60a automatically starts a quick charge operation with a preset current value.

  Next, the quick charge end operation and handling will be described. When the battery unit 32 is charged up to a predetermined charge amount with a current value preset in the charger / discharger 60a, the operation of the charger / discharger 60a automatically stops. However, at this stage, the controller 60 does not yet turn off the quick charge ON indicator lamp. Even when the quick charging is in progress, the quick charging operation can be stopped by operating the quick charging OFF switch 72 when it is desired to leave after a predetermined stoppage time. After this operation, the controller 60 closes the third circuit breaker 14b and inserts the filter reactor 14a provided in the front stage of the overhead wire side step-up / step-down chopper circuit 20, and the first and second drive inverter circuits 4, 5 By turning on the fifth and sixth contactors 50 and 51 provided in the preceding stage, the vehicle can travel in the overhead wire hybrid mode.

  It should be noted that while the quick charge ON indicator light is on, it is configured not to accept the lowering operation of the current collector 10 even if the pant lowering button is operated, so that the current collector 10 can be slid by a large current interruption. Arc generation on the plate can be prevented. Further, the controller 60 operates the timer immediately after the operation of the quick charge ON switch 72, and is configured to automatically enter an emergency shut-off state when a set time such as 1 minute elapses. This assumes that although a high-resistance ground fault occurs and a ground fault current flows through the battery unit 32, when the value is close to the value at the time of normal quick charge, it is determined that other devices are normal and protection is not applied. It is the operation that did.

  Next, the operation and operation when the unit is cut will be described. As shown in FIG. 1, this electric vehicle constitutes one unit in which two induction motors are connected to one drive inverter circuit, and has two such units. As a four-axis driving electric vehicle, uniform driving force and braking force can be obtained for all four axes. Note that most of the braking force is regenerative braking force. When it is desired to disconnect one unit due to a failure or the like, the first group (first and fourth axes) release switch or the second group (second and third axes) of the battery operation switch panel 70 attached to the cab By operating an opening switch (referred to collectively as a “1/2 group opening switch 75”), it is possible to provide a two-end or two-axis drive vehicle. By this operation, the controller 60 opens the fifth or sixth contactor 50, 51 provided in the input stage of the first or second drive inverter circuit 4, 5, and opens the group of indicator lights 71 or Of the second group opening indicator lamp 71d, the indicator lamps of the opened group are turned on.

  The air brake cannot be controlled for each individual axis or for each carriage, and in the case of four axes at a time, the air brake is applied equally to all axes. Differences appear. However, since the braking forces of the first and fourth axes are equal and the braking forces of the second and third axes are equal, there is no problem with the brake balance before and after the vehicle body. Further, during emergency braking, all the axes operate only with the air brake, and the braking force is uniform across all axes, so there is no safety problem. In order to return from the unit open state to the built-in state by the 1/2 group open switch 75, an open reset switch (not shown) (usually provided in the converter / inverter compartment monitor device) is operated.

  Further, the battery operation switch panel 70 is provided with a power save ON / OFF switch 76. When the power save ON / OFF switch 76 is switched, the controller 60 controls the overhead wire side step-up / step-down chopper circuit 20 and the battery side step-up / step-down chopper circuit 40 and supplies them to the first and second drive inverter circuits 4, 5. The power is suppressed to the power equivalent to two axes while driving four axes. This power save mode can be used, for example, in a section where the substation power is weak and does not require high acceleration / deceleration. By returning the power save ON / OFF switch 76, the controller 60 returns the battery-side step-up / down chopper circuit 40 to full power drive. When the power save mode is selected, the controller 60 controls the overhead wire side step-up / step-down chopper circuit 20 and the battery side step-up / step-down chopper circuit 40 so that the current value at the time of quick charging is also saved to half. Is configured to do.

  As described above, in this embodiment, the battery unit 32 is composed of four battery units 32. However, when any one of the battery units 32 is tripped (when the circuit breaker 31 is tripped), the tripped battery unit 32 is tripped. The controller 60 controls the battery-side step-up / step-down chopper circuit 20 to limit the power according to the number. As described above, the connection state of the circuit breaker 31 for wiring is always transmitted to the control unit (that is, the controller 60) of the charger / discharger 61a. Done. Specifically, as shown in FIG. 8, the controller 60 has data indicating the relationship between the rotational speed of the induction motors 7a, 7b, 8a, and 8b and the necessary torque for each number of trips. Accordingly, the drive inverter circuits 4 and 5 and the battery-side step-up / step-down chopper circuit 20 are controlled.

In this embodiment, when the speed reaches 80 km / h while the power running notch is turned on, the speed limiter operates and the notch is turned off. The regenerative brake is configured to be applied even at higher speeds. Further, in the power saving mode, the speed limiter operates reaches the speed of 40 km / h, the regenerative braking is configured to operate from any more speed.

  As shown in FIG. 1, the hybrid power supply system 1 according to the present embodiment includes each of the three contactors of the first contactor group 21 of the overhead wire side power supply circuit 2 and each of the three first smoothing reactors 22. Three connection terminals 54 are provided between the two. The overhead wire side step-up / step-down chopper circuit 20 can operate not only to step up / step down a DC voltage but also to operate as a PWM converter that converts input alternating current into direct current. Therefore, when a three-phase AC power source (for example, a synchronous motor driven by an engine) is connected to the three connection terminals 54 and the first contactor group 21 is opened, only the DC power supplied from the trolley wire T is used. In addition, three-phase AC power can be supplied to the induction motor 7a and the battery module 32. Of course, it is also possible to connect a single-phase AC power source to two of the three connection terminals 54.

  Similarly, three connection terminals 55 are provided between each of the three contactors of the second contactor group 38 of the battery-side power supply circuit 3 and each of the three second smoothing reactors 39. Also in this case, when the synchronous motor driven by the engine is connected to the connection terminal 55 and the second contactor group 38 is opened, the power from the generator driven by the engine instead of the battery module 32 and the trolley wire T This electric vehicle can be hybrid-operated using the electric power supplied from the vehicle.

It is a circuit diagram which shows the structure of the hybrid power supply system which concerns on this invention. It is a block diagram which shows the control circuit of the said hybrid power supply system. It is a figure which shows a battery operation switch board, (a) is a front view, (b) is an enlarged view of an indicator lamp. It is a circuit diagram which shows the structure of a battery module. It is a circuit diagram which shows the principal part of a battery side power supply circuit. It is explanatory drawing which shows the intermittent state of the contactor for every driving mode. It is explanatory drawing which shows the intermittent state of the contactor for every driving | running | working mode and overhead wire voltage. It is explanatory drawing which shows the relationship between the rotational speed for every number of trips, and electric power.

Explanation of symbols

1 Hybrid power supply system 2 Overhead side power supply circuit (first power supply circuit)
3 Battery-side power circuit (second power circuit)
10 current collector 15 first contactor (switching means)
16 Second contactor (switching means)
18 Overhead side first voltage detector (voltage detection means)
20 overhead wire step-up / down chopper circuit 20a input terminal 20b output terminal 25 3rd contactor (switching means)
26 4th contactor (switching means)
32 Battery unit 40 Battery side step-up / down chopper circuit 60 Controller

Claims (2)

The power collected by the current collector from the overhead wire to which either the first voltage or the second voltage lower than the first voltage is applied is converted into an intermediate circuit voltage equal to or higher than the second voltage to load A first power supply circuit for supplying to
A battery that outputs the second voltage, and a chopper circuit that converts the second voltage output from the battery into the intermediate circuit voltage, and is connected in parallel with the first power supply circuit to the load. A second power supply circuit for supplying power of the battery;
Anda controller for controlling the operation of said first power supply circuit and said second power supply circuit,
The first power supply circuit includes :
A first input / output terminal and a second input / output terminal; the first voltage input from the second input / output terminal is converted into the intermediate circuit voltage; A step- up / step-down chopper circuit that outputs, converts the second voltage input from the first input / output terminal into the intermediate circuit voltage, and outputs the intermediate circuit voltage from the second input / output terminal ;
The current collector is connected to the second input / output terminal , the load is connected to the first input / output terminal in a first state, and the current collector is connected to the first input / output terminal. Switching means for switching between a second state in which the load is connected to the second input / output terminal and a third state in which the current collector and the first power supply circuit are disconnected ;
Voltage detecting means for detecting the voltage of the overhead wire applied to the current collector,
The controller is
When the voltage detected by the voltage detecting means is within a predetermined range including the first voltage, the switching means is controlled to the first state, and the voltage detected by the voltage detecting means is When the voltage is within a predetermined range including the second voltage, the switching means is controlled to the second state, and when the voltage detected by the voltage detection means is not within the predetermined range, the switching means is Controlling to said 3rd state, The hybrid power supply system characterized by the above-mentioned . The switching means is
An interrupter for interrupting the current collector and the first power supply circuit;
A first contactor for intermittently connecting the current collector and the second input / output terminal ;
A second contactor for intermittently connecting the current collector and the first input / output terminal ;
A third contactor for intermittently connecting the first input / output terminal and the load;
A fourth contactor for intermittently connecting the second input / output terminal and the load ;
The controller is
When the voltage detected by the voltage detection means is within the predetermined range including the first voltage, the interrupter, the first contactor and the third contactor are connected. Cutting the second contactor and the fourth contactor,
When the voltage detected by the voltage detection means is within the predetermined range including the second voltage, the first contactor and the third contactor are disconnected, and the interrupter, Bringing the second contactor and the fourth contactor into a connected state;
When the voltage detected by the voltage detecting means is not within the predetermined range, the interrupter is disconnected.
The hybrid power supply system according to claim 1.

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