JP7170916B2 - Noise suppression device and electric vehicle control device - Google Patents

Description

TECHNICAL FIELD The present invention relates to a noise suppression device that suppresses noise component current leaking from a power converter, and an electric vehicle control device equipped with the noise suppression device mounted on an electric vehicle.

An electric vehicle control device includes a power converter that receives power supplied from overhead lines and uses the received power to drive a traction motor. A power converter internally includes a conversion element. Due to the switching operation of the conversion element of the power converter, a return line current containing a noise component current flows in the rail that is the return path to the substation that serves as the power supply. The AC component contained in the noise component current may cause malfunction of railway safety equipment including existing railroad crossing control devices and railroad detection devices. Therefore, it may be required to reliably attenuate the AC component included in the noise component current.

Under the technical background as described above, Patent Document 1 below describes an electric vehicle control device configured to receive a DC voltage through a filter circuit consisting of a filter reactor and a filter capacitor. A configuration is disclosed in which a filter circuit that increases the input impedance with respect to the power supply frequency of an AC power supply is connected in parallel to an existing filter circuit.

Japanese Unexamined Patent Application Publication No. 2006-6002

In the prior art described above, a new filter circuit is added to suppress the AC component included in the noise component current. However, the entire filter circuit including the existing filter circuit and the additional filter circuit contains not only the noise component current to be reduced, but also the originally necessary DC current component, specifically several hundred [A] to a thousand [A]. A] current flows. Therefore, the added circuit elements are inevitably increased in size, leading to an increase in the weight of the vehicle and the amount of heat generated. Therefore, it is desired to suppress the noise component current while avoiding an increase in the size of additional circuit elements.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a noise suppression device capable of suppressing a noise component current while avoiding an increase in the size of additional circuit elements.

In order to solve the above-described problems and achieve the object, the present invention provides an electric vehicle equipped with a power conversion unit having an inverter and a filter circuit arranged between the overhead wire and the inverter. This is a noise suppressing device that suppresses noise component current leaking to overhead lines or rails. The inverter converts DC power supplied through a positive busbar electrically connected to the overhead line and a negative busbar electrically connected to the rail into AC power for a load. The noise suppression device includes a noise suppression section and a control section. The noise suppressor includes a capacitor having a negative side electrically connected to the negative bus via a connection conductor. Also, the noise suppression unit has an upper arm semiconductor element and a lower arm semiconductor element connected in series, the upper arm semiconductor element being connected to the positive side of the capacitor, and the lower arm semiconductor element being connected to the negative side of the capacitor. It has a switching circuit unit. Further, the noise suppression unit includes a reactor having one end connected to a connection point between the upper arm semiconductor element and the lower arm semiconductor element and the other end electrically connected to a positive bus line between the overhead wire and the power conversion unit. Prepare. The control unit detects noise according to input/output current flowing between the connection point of the reactor on the positive side bus and the power conversion unit, or input/output current flowing between the connection point of the capacitor on the negative side bus and the power conversion unit. The switching circuit section is controlled so that the component current is suppressed.

According to the noise suppression device of the present invention, it is possible to suppress the noise component current while avoiding an increase in the size of additional circuit elements.

1 is a diagram showing a configuration example of a railway system including a noise suppression device according to Embodiment 1. FIG. 4 is a diagram showing a configuration example of a control unit according to Embodiment 1; FIG. FIG. 2 is a block diagram showing an example of a hardware configuration for realizing functions of an inverter control unit and a control unit according to Embodiment 1; FIG. 4 is a block diagram showing another example of a hardware configuration that implements the functions of the inverter control unit and the control unit according to Embodiment 1; FIG. 10 is a diagram showing a configuration example of a railway system including a noise suppression device according to Embodiment 2;

A noise suppression device and an electric vehicle control device according to embodiments of the present invention will be described in detail below with reference to the accompanying drawings. In addition, the present invention is not limited by the following embodiments.

Embodiment 1.
FIG. 1 is a diagram showing a configuration example of a railway system 150 including a noise suppression device 100 according to Embodiment 1. As shown in FIG. The railway system 150 includes an overhead wire 1 , a current collector 2 , a switch 3 , a power converter 11 , a load 8 , wheels 9 , and rails 10 . The electric vehicle control device according to Embodiment 1 is configured by a noise suppression device 100 and a power conversion section 11 .

The railroad system 150 is a DC overhead wire system. The overhead line 1 is connected to a substation (not shown). The substation and the power converter 11 are electrically connected via the collector 2 , the positive bus 2 a , the negative bus 2 b , the switch 3 , the wheels 9 and the rails 10 .

A DC voltage is supplied to the overhead line 1 . Typical DC voltage ratings are in the range of 600V to 3000V. The current collector 2 is provided in an electric car (not shown). The current collector 2 receives DC power supplied from the overhead wire 1 by sliding in contact with the overhead wire 1 . The received DC power is input to the switch 3 through the positive bus 2a. The switch 3 is a switch that opens and closes electrical connection between the overhead wire 1 and the power converter 11 . The switch 3 may be arranged inside the power converter 11 . The switch 3 switches whether power is supplied to the power converter 11 . During normal operation, the switch 3 is controlled to be on. Also, when the inverter 6 is stopped or malfunctions, the switch 3 is controlled to be in an off state.

In FIG. 1, an overhead wire is shown as the overhead wire 1, and a pantograph-like current collector is shown as the current collector 2, but the present invention is not limited to these. The overhead wire 1 may be a third rail used in subways and the like, and accordingly, the current collector 2 may be a current collector for the third rail.

The power conversion unit 11 includes a filter reactor 4a, a filter capacitor 4b arranged downstream of the filter reactor 4a, and an inverter 6 including a plurality of semiconductor elements 6a. The filter reactor 4a is a component in which a conductor is wound in a coil shape. A filter circuit 4 is configured by the filter reactor 4a and the filter capacitor 4b. Filter circuit 4 is arranged between overhead wire 1 and inverter 6 .

Due to the switching operation of the semiconductor element 6a provided in the inverter 6, a return current including noise component current flows through the rail 10, which is a return path to the power substation. As described above, the AC component included in the noise component current may cause malfunction of railway safety equipment including the existing railroad crossing control device and railroad detection device. The filter circuit 4 attenuates the noise component current contained in the return current, thereby suppressing the AC component contained in the noise component current from flowing out to the overhead wire 1 and the rail 10 side. In addition to the DC component, the DC voltage output from the overhead line 1 is superimposed with an AC component voltage due to rectification ripples generated in a rectifier at a substation. When this AC component voltage is large, the filter circuit 4 suppresses the noise component current caused by this from flowing to the overhead wire 1 and rail 10 side.

A large amount of electric power is required to drive an electric vehicle. Therefore, a large current flows through the filter reactor 4a. In order to cope with this, the cross-sectional area of the conductor of the filter reactor 4a made of aluminum or copper is increased. Moreover, in order to secure the necessary inductance, the conductor of the filter reactor 4a is wound many times. In the case of a general commuter train, the filter reactor 4a is required to have a current capacity capable of withstanding a current of several hundred [A] to a thousand [A]. For this reason, the filter reactor 4a becomes a heavy component of about 500 [kg].

The inverter 6 provided in the electric car is generally composed of a 2-level or 3-level three-phase inverter circuit using a plurality of semiconductor elements 6a. The inverter 6 is controlled by an inverter control section 7 . A load 8 is connected to the inverter 6 .

If the inverter 6 is the inverter of a propulsion control system, the load 8 is the traction motor for driving the electric train. The inverter control unit 7 operates the inverter 6 at a variable voltage and variable frequency to perform power running control or regenerative control of the traction motor, thereby driving and braking the electric vehicle. When the inverter 6 is an inverter of an auxiliary power supply, the load 8 is auxiliary equipment including an air conditioner, lighting equipment, security equipment, a compressor, a battery, and a control power supply. The inverter control unit 7 supplies stable power to the load 8 by operating the inverter 6 at constant voltage and constant frequency.

The inverter control unit 7 performs switching control for the semiconductor element 6a provided in the inverter 6 based on a command from a higher control system (not shown). By this control, the inverter 6 converts the DC power held in the filter capacitor 4 b into AC power and supplies it to the load 8 .

A signal S<b>6 output from the control unit 90 is input to the inverter control unit 7 . Further, the inverter control section 7 outputs a signal S3 to the control section 90 and outputs a signal S7 to the switch 3 . A signal S4 output from the control unit 90 is also input to the switch 3 . The operation of each section based on these signals S3, S4, S6 and S7 will be described later.

Next, the noise suppression device 100 will be described. The noise suppression device 100 includes a noise suppression section 80 and a control section 90 that controls the noise suppression section 80 . The noise suppression device 100 is a device that suppresses noise component current leaking from the inverter 6 to the overhead wire 1 or the rail 10 . The noise suppression device 100 complements or enhances the function of the filter circuit 4 described above. Although the detailed function will be described later, the noise suppression device 100 can effectively reduce the AC component contained in the noise component current superimposed on the return current and flowing.

The noise suppression unit 80 includes a capacitor 50 , a switching circuit unit 40 , a reactor 30 , a switching circuit unit 20 , current detectors 60 and 70 , and voltage detectors 81 and 82 . In the following description, current detector 60 may be called "first current detector" and current detector 70 may be called "second current detector". Note that the current detector 70 and the voltage detector 82 may be configured to utilize existing detectors.

The switching circuit section 40 includes an upper arm semiconductor element 41 and a lower arm semiconductor element 42 . Upper arm semiconductor element 41 and lower arm semiconductor element 42 are connected in series. Upper arm semiconductor element 41 is connected to the positive side of capacitor 50 . Lower arm semiconductor element 42 is connected to the negative side of capacitor 50 . The negative side of capacitor 50 is connected to negative bus 2b via connection conductor 84 . One end of reactor 30 is connected to a connection point between upper arm semiconductor element 41 and lower arm semiconductor element 42 . The other end of reactor 30 is connected to positive bus line 2 a via switching circuit section 20 . That is, the other end of reactor 30 is electrically connected to positive bus 2a.

The control unit 90 controls the switching circuit unit 40 according to the current IS1 flowing through the positive bus 2a or the negative bus 2b.

The switching circuit unit 20 is a switch that opens and closes electrical connection between the reactor 30 and the positive bus line 2a. The switching circuit section 20 has a circuit section in which a circuit formed by the main switch 21 and a charging circuit in which the charging switch 22 and the charging resistor 23 are connected in series are connected in parallel. A signal S5 output from the control unit 90 is input to the switching circuit unit 20 . On/off of the main switch 21 and the charging switch 22 are controlled by a signal S5.

When starting the noise suppression device 100 from a stopped state, the capacitor 50 needs to be charged. Therefore, only the charging switch 22 is first controlled to be ON. Power from the positive bus 2a flows into the capacitor 50 via the charging switch 22 and the charging resistor 23, and the capacitor 50 is charged. When the charging of the capacitor 50 is completed, the main switch 21 is turned on. Note that the main switch 21 and the charging switch 22 are controlled by a signal S5 output from the control section 90, which will be described later.

The reactor 30 is a component obtained by winding a conductor in a coil shape, similar to the filter reactor 4a. On the other hand, the current flowing through the reactor 30 is as small as several [A] at maximum. Therefore, the reactor 30 may have a significantly smaller current capacity than the filter reactor 4a. Therefore, the reactor 30 is a small and lightweight component weighing several [kg].

Current detector 60 detects current ICH1 flowing through reactor 30 . A detected value ICH of current ICH1 detected by current detector 60 is input to control unit 90 . In the following description, the detection value ICH may be called "first output". The current flowing through the reactor 30 and the current flowing through the connection conductor 84 have the same magnitude and opposite directions. For this reason, the current detector 60 may be arranged on the connecting conductor 84 .

Current detector 70 detects current IS1 flowing through positive bus 2a. The current IS1 is also the input current to the filter circuit 4. FIG. A detected value IS of current IS1 detected by current detector 70 is input to control unit 90 . In the following description, the detection value IS may be called "second output". The current flowing through the positive bus 2a and the current flowing through the negative bus 2b have the same magnitude and opposite directions. Therefore, the current detector 70 may be arranged on the negative bus 2b.

An example of the upper arm semiconductor element 41 and the lower arm semiconductor element 42 is the illustrated insulated gate bipolar transistor (IGBT) with a built-in anti-parallel diode, but other switching elements may be used. Another example of the upper arm semiconductor element 41 and the lower arm semiconductor element 42 is a metal oxide semiconductor field effect transistor (MOSFET). In addition to silicon (Si), wide bandgap semiconductors such as silicon carbide (SiC), gallium nitride (GaN), gallium oxide (Ga ₂ O ₃ ), diamond, etc., can be used as materials for the switching elements. good too. If the upper arm semiconductor element 41 and the lower arm semiconductor element 42 are made of a wide bandgap semiconductor material, low loss and high speed switching can be achieved.

Signals S1 and S2 output from the control unit 90 are input to the switching circuit unit 40 . Signal S1 is a switching signal that controls conduction of upper arm semiconductor element 41 . A signal S2 is a switching signal that controls conduction of the lower arm semiconductor element 42 .

A voltage detector 82 detects an overhead wire voltage, which is the voltage of the overhead wire 1 . A detection value ES of the overhead wire voltage detected by the voltage detector 82 is input to the control unit 90 .

Voltage detector 81 detects a capacitor voltage, which is the voltage across capacitor 50 . A capacitor voltage detection value ECH detected by the voltage detector 81 is input to the control unit 90 .

A DC voltage higher than the overhead line voltage is held in the capacitor 50 under the control of the control unit 90 . Capacitor 50 functions as a main power supply for noise suppression device 100 .

Next, a detailed configuration of the control unit 90 will be described. FIG. 2 is a diagram showing a configuration example of the control unit 90 according to the first embodiment. The control unit 90 includes a first control unit 90a, a second control unit 90b, a third control unit 90c, a subtractor 90d, a divider 90e, and a sequence control unit 91.

A detection value IS of the current IS1 detected by the current detector 70 is input to the first control unit 90a. The first control unit 90a cuts the DC component of the detected value IS of the current IS1 and generates a signal IAC ^* mainly containing noise components. A signal IAC ^* represents a noise component flowing through the filter reactor 4a.

A detection value ECH of the capacitor voltage detected by the voltage detector 81 is input to the second control unit 90b. In the second control unit 90b, the deviation DE between the signal ECH ^* , which is the command value of the capacitor voltage, and the detected value ECH is controlled by Proportional Integral (PI), and the control value is generated as the signal DEP. PI control is arithmetic control using a proportional element and an integral element, and is a general arithmetic method for calculating signal DEP.

The signal DEP is a signal for maintaining the detected value ECH of the capacitor voltage at the signal ECH ^* representing the command value of the capacitor voltage. If detected value ECH is greater than signal ECH ^* , signal DEP is generated such that capacitor 50 is discharged. When the detected value ECH is smaller than the signal ECH ^* , the signal DEP is generated so that the current flows in the direction of charging the capacitor 50 .

The signal IAC ^* and the signal DEP are input to the subtractor 90d. The subtractor 90d subtracts the signal DEP from the signal IAC ^* , and the calculated value is generated as the signal ICH ^* . A signal ICH ^* is a current command signal representing a command value of the current to be supplied to the reactor 30 .

In the following description, the signal ICH ^* , which is the output of the subtractor 90d, may be called the "first signal", and the signal IAC ^* , which is the input of the subtractor 90d, may be called the "second signal".

The overhead line voltage detection value ES and the capacitor voltage detection value ECH detected by the voltage detector 81 are input to the divider 90e. The divider 90e divides the detected value ES by the detected value ECH, and the calculated value is generated as the signal EM. The signal EM is a signal representing the ratio between the voltage on the input side and the voltage on the output side of the switching circuit section 40 . The input side is the capacitor 50 side, and the output side is the reactor 30 side. The signal EM takes a value of 0 or more and 1 or less.

The third control unit 90c has a signal ICH ^* output from the subtractor 90d, a detected value ICH of the current ICH1, a signal EM output from the divider 90e, and a signal output from the sequence control unit 91 described later. S8 is input. In the third control unit 90c, the deviation DI between the signal ICH ^* and the detected value ICH of the current ICH1 is PI-controlled, and the control value is generated as the signal DIP. Signal DIP and signal EM are added, and the calculated value is generated as signal M ^* . A signal M ^* represents the duty ratio of the switching circuit section 40 .

Furthermore, in the third controller 90c, signals S1 and S2 are generated from the signal M ^* by pulse width modulation (PWM) control. As described above, signal S1 is a switching signal that controls conduction of upper arm semiconductor element 41, and signal S2 is a switching signal that controls conduction of lower arm semiconductor element . A known technique can be used for PWM control. A triangular wave comparison method using a triangular wave as a comparison signal, a sawtooth wave comparison method using a sawtooth wave as a comparison signal, and the like are common.

Next, the sequence control section 91 will be explained. Sequence control unit 91 receives signal S<b>3 output from inverter control unit 7 . A signal S3 is a signal representing an operation command or a stop command to the noise suppressor 80 . When the signal S3 is an operation command instructing the operation of the noise suppression unit 80, the sequence control unit 91 sets the signal S8 to ON to execute PWM control, and sets the signal S5 to ON to operate the switching circuit unit. 20 is turned on.

When the signal S3 is a stop command instructing to stop the operation of the noise suppression unit 80, the sequence control unit 91 turns off the signal S8 to stop execution of the PWM control, and turns off the signal S5. to control the switching circuit unit 20 to be off.

Further, when the noise suppression unit 80 fails, the sequence control unit 91 generates a signal S<b>6 indicating the failure and sends it to the inverter control unit 7 . When the signal S6 indicates a failure of the noise suppression unit 80, the inverter control unit 7 stops the operation of the inverter 6, sets the signal S7 to OFF, and controls the switch 3 to be OFF. Note that "when the noise suppressor 80 fails" means when any of the components of the noise suppressor 80 fails.

Furthermore, the sequence controller 91 generates the signal S4 when the noise suppressor 80 fails. A signal S4 is a signal for turning off the switch 3 and is output to the switch 3 .

In the configuration of Embodiment 1, when the noise suppression unit 80 fails, the signal S4 from the control unit 90 and the signal S7 from the inverter control unit 7 are output to the switch 3 . Therefore, even if not only the noise suppressing section 80 but also the control section 90 fails, the switch 3 can be reliably controlled to be turned off. Thereby, the reliability of the device can be improved.

In the following description, the signals S3 and S7 output from the inverter control section 7 may be called "third signal" and "seventh signal", respectively. Signals S4, S5, S6, and S8 output from sequence control section 91 may be called "fourth signal", "fifth signal", "sixth signal" and "eighth signal", respectively.

As described above, the noise suppression unit 80 according to the first embodiment includes the capacitor 50 whose negative side is electrically connected to the negative side bus 2b via the connection conductor 84, and the upper arm semiconductor element 41 is connected to the positive side of the capacitor 50. , and a switching circuit unit 40 in which the lower arm semiconductor element 42 is connected to the negative side of the capacitor 50 . Noise suppression unit 80 also includes a reactor 30 having one end connected to a connection point between upper arm semiconductor element 41 and lower arm semiconductor element 42 and the other end electrically connected to positive bus line 2a. Further, the control unit 90 includes a second control unit 90b that performs voltage feedback control so that the detected value ECH of the capacitor voltage matches the signal ECH ^* , which is the command value of the capacitor voltage. With this voltage feedback control, the capacitor 50 can obtain the necessary power from the overhead line 1 through the reactor 30 and the switching circuit section 40, and maintain the capacitor voltage at the command value. This eliminates the need for a separate charging device or separate power supply to maintain the capacitor voltage. Therefore, it is possible to reduce the size and weight of the noise suppression device 100 and facilitate handling.

The control unit 90 also includes a third control unit 90c that performs current feedback control so that the detected value ICH of the current ICH1 flowing through the reactor 30 matches the signal ICH ^* , which is the command value of the current that should flow through the reactor 30. there is By the current feedback control, the noise suppression unit 80 can generate a current having the same magnitude and opposite phase as the noise component current contained in the current IS1 flowing through the filter reactor 4a. As a result, the noise component currents at the current collector 2 and the wheel 9 cancel each other out, so that the noise component current can be reduced. Also, due to the actions of the reactor 30 and the switching circuit section 40, the overhead wire voltage can be boosted and supplied to the capacitor 50, so that a voltage higher than the overhead wire voltage can be held. As a result, the retained high-voltage energy can be used without an external power supply device, etc., so that the noise suppression unit 80 can be made compact and lightweight while effectively suppressing the outflow of the noise component current to the overhead wire 1 and the rail 10. be able to.

In addition, from the noise suppression unit 80, only the current having the same magnitude as the noise component current and having the opposite phase is sent to the positive bus 2a and the negative bus 2b. be blocked. As a result, the total weight of the added circuit elements of the upper arm semiconductor element 41, the lower arm semiconductor element 42, the capacitor 50, and the reactor 30 can be reduced to about several tens [kg]. If the inductance value of the filter reactor 4a is increased, the capacitance of the filter capacitor 4b is increased, or a new filter circuit is added in order to obtain the same noise suppression effect, an increase of about several hundred [kg] is required. is expected. Therefore, by using the method of the first embodiment, it is possible to suppress the noise component current while avoiding an increase in the size of the added circuit element.

In addition, the inverter control section 7 is configured to be able to instruct the operation and stop of the noise suppression device 100 . Therefore, the operation of the inverter 6 and the operation of the noise suppression device 100 can be coordinated. As a result, the noise suppression device 100 operates only when the inverter 6 is operating, so that unnecessary operations can be eliminated and the noise suppression device 100 can be operated efficiently.

In addition, when the noise suppression unit 80 fails, the switching circuit unit 20 can be controlled to be turned off by the control unit 90 . As a result, unintended noise component current can be prevented from flowing out to the overhead wire 1 or the rail 10 .

Further, when the noise suppression unit 80 fails, the switch 3 can be controlled to be turned off by the control unit 90 or the inverter control unit 7, and the operation of the inverter 6 can also be stopped. Therefore, the inverter 6 does not continue to operate without noticing the failure of the noise suppressor 80 . This can prevent unnecessary noise component current from flowing out to the overhead wire 1 or the rail 10 .

It is important to electrically connect the other end of the reactor 30 to the positive bus 2a between the current collector 2 and the filter reactor 4a, as shown in FIG. For example, if the other end of reactor 30 is connected to positive bus 2a between filter reactor 4a and inverter 6, most of current ICH1 generated by noise suppression device 100 is absorbed by filter capacitor 4b. Therefore, the noise component current cannot flow, and the desired effect cannot be exhibited.

Next, a hardware configuration for realizing the functions of the inverter control unit 7 and the control unit 90 according to Embodiment 1 will be described with reference to FIGS. 3 and 4. FIG. FIG. 3 is a block diagram showing an example of a hardware configuration that implements the functions of the inverter control section 7 and the control section 90 according to the first embodiment. FIG. 4 is a block diagram showing another example of the hardware configuration that implements the functions of the inverter control section 7 and the control section 90 according to the first embodiment.

When implementing some or all of the functions of the inverter control unit 7 and the control unit 90 in Embodiment 1, as shown in FIG. The configuration can include a memory 302 that is connected to the memory 302 and an interface 304 that inputs and outputs signals.

The processor 300 may be an arithmetic means such as an arithmetic unit, a microprocessor, a microcomputer, a CPU (Central Processing Unit), or a DSP (Digital Signal Processor). The memory 302 includes non-volatile or volatile semiconductor memories such as RAM (Random Access Memory), ROM (Read Only Memory), flash memory, EPROM (Erasable Programmable ROM), EEPROM (registered trademark) (Electrically EPROM), Examples include magnetic discs, flexible discs, optical discs, compact discs, mini discs, and DVDs (Digital Versatile Discs).

The memory 302 stores programs for executing the functions of the inverter control unit 7 and the control unit 90 in the first embodiment. Processor 300 performs the above-described processing by exchanging necessary information via interface 304, executing programs stored in memory 302, and referring to tables stored in memory 302 by processor 300. It can be carried out. Results of operations by processor 300 may be stored in memory 302 .

Further, when realizing part of the functions of the inverter control unit 7 and the control unit 90 in Embodiment 1, the processing circuit 303 shown in FIG. 4 can also be used. The processing circuit 303 corresponds to a single circuit, a composite circuit, an ASIC (Application Specific Integrated Circuit), an FPGA (Field-Programmable Gate Array), or a combination thereof. Information to be input to the processing circuit 303 and information to be output from the processing circuit 303 can be obtained via the interface 304 .

Note that the processing circuit 303 may perform a part of the processing in the inverter control unit 7 and the control unit 90 , and the processor 300 and the memory 302 may perform the processing that is not performed in the processing circuit 303 .

Embodiment 2.
FIG. 5 is a diagram showing a configuration example of a railway system 150A including a noise suppression device 100A according to Embodiment 2. As shown in FIG. In a railroad system 150A shown in FIG. 5, the noise suppression device 100 is replaced with a noise suppression device 100A, and the switch 3 is replaced with a charging circuit section 3A in the configuration of the railroad system 150 shown in FIG. Further, in the noise suppression device 100A, the switching circuit section 20 is removed from the configuration of the noise suppression device 100 shown in FIG. Further, in FIG. 5, the connection destination of the other end of the reactor 30 is changed to the positive bus line 2a between the charging circuit section 3A and the filter reactor 4a. Furthermore, the output destinations of the signals S4, S5 and S7 are changed from the switch 3 to the charging circuit section 3A. Other configurations are the same as or equivalent to those in FIG. In addition, the same code|symbol is attached|subjected to the same or equivalent structure part, and the overlapping description is abbreviate|omitted.

In Embodiment 1, the switch 3 and the switching circuit section 20 are installed for the purpose of opening and closing the circuit, and are not essential parts of the present invention. In addition, a general electric vehicle is provided with a charging circuit for initial charging of the large-capacity filter capacitor 4b. The charging circuit section 3A in FIG. 5 corresponds to this charging circuit.

The charging circuit section 3A, like the switching circuit section 20, has a circuit section in which a circuit formed by the main switch 3A1 and a charging circuit in which a charging switch 3A2 and a charging resistor 3A3 are connected in series are connected in parallel. ing. In the charging circuit section 3A, ON/OFF of the main switch 3A1 and the charging switch 3A2 are controlled by signals S4 and S5 output from the control section 90 and a signal S7 output from the inverter control section . Note that the configuration and operation of the control unit 90 are the same as those of the first embodiment, and the description thereof will be omitted here.

It should be noted that the configuration shown in the above embodiment shows an example of the contents of the present invention, and it is possible to combine it with another known technique, and the configuration can be changed without departing from the gist of the present invention. It is also possible to omit or change part of

For example, in FIG. 1, the control unit 90 and the inverter control unit 7 are described as separate components, but the configuration is not limited to this. Both controllers may be integrated into one controller.

Further, although the noise suppression device 100 has been described as a device included inside the electric vehicle control device, it is not limited to this. It is sufficient that the noise suppression device 100 and the power conversion unit 11 are electrically connected, and the noise suppression device 100 may be configured as a device outside the electric vehicle control device.

Also, in this specification, the content of the invention is described with consideration given to its application to an electric vehicle control device, but the field of application is not limited to this, and application to various related fields is possible. Needless to say.

1 overhead line, 2 collector, 2a positive bus, 2b negative bus, 3 switch, 3A charging circuit, 3A1 main switch, 3A2 charging switch, 3A3 charging resistor, 4 filter circuit, 4a filter reactor, 4b filter capacitor, 6 inverter, 6a semiconductor device, 7 inverter control unit, 8 load, 9 wheel, 10 rail, 11 power conversion unit, 20 switching circuit unit, 21 main switch, 22 charging switch, 23 charging resistor, 30 reactor, 40 switching circuit unit , 41 upper arm semiconductor element, 42 lower arm semiconductor element, 50 capacitor, 60, 70 current detector, 80 noise suppression unit, 81, 82 voltage detector, 84 connection conductor, 90 control unit, 90a first control unit, 90b Second controller, 90c Third controller, 90d Subtractor, 90e Divider, 91 Sequence controller, 100, 100A Noise suppression device, 150, 150A Railway system, 300 Processor, 302 Memory, 303 Processing circuit, 304 Interface.

Claims (10)

an inverter that converts DC power supplied through a positive busbar electrically connected to an overhead line and a negative busbar electrically connected to a rail into AC power for a load; and the overhead line and the inverter. A noise suppression device mounted on an electric vehicle including a power conversion unit having a filter circuit disposed therebetween and suppressing noise component current leaking from the inverter to the overhead wire or the rail,
A capacitor having a negative side electrically connected to the negative side bus via a connection conductor, and an upper arm semiconductor element and a lower arm semiconductor element connected in series, the upper arm semiconductor element being the positive side of the capacitor. a switching circuit unit connected to the lower arm semiconductor element to the negative side of the capacitor, one end connected to a connection point between the upper arm semiconductor element and the lower arm semiconductor element, and the other end connected to the overhead wire and a reactor electrically connected to the positive bus between the power conversion unit;
a noise suppressor comprising
Depending on the input/output current flowing between the connection point of the reactor on the positive side bus and the power conversion unit, or the input/output current flowing between the connection point of the capacitor on the negative side bus and the power conversion unit a control unit that controls the switching circuit unit so that the noise component current is suppressed by
A noise suppression device comprising: The noise suppression device according to claim 1, wherein the capacitor holds a voltage higher than the voltage of the overhead wire. a first current detector that detects a current flowing through the reactor or the connection conductor;
a second current detector that detects the input/output current;
with
The control unit controls the first output, which is the output of the first current detector, to match the first signal generated based on the second output, which is the output of the second current detector. controls the switching circuit,
3. The noise suppression device according to claim 1, wherein the first signal is generated based on a second signal obtained by removing a DC component contained in the second output. The electric vehicle includes an inverter control unit that controls the operation of the inverter,
the control unit is configured to receive a third signal instructing the operation of the noise suppression unit from the inverter control unit;
4. The device according to any one of claims 1 to 3, wherein switching control is performed on the upper arm semiconductor element and the lower arm semiconductor element when the operation of the switching circuit section is instructed by the third signal. noise suppression device. A switching circuit section for opening and closing an electrical connection between the reactor and the positive bus,
The control unit generates a fifth signal for turning off the switching circuit unit and outputs the fifth signal to the switching circuit unit when any of the components of the noise suppressing unit has failed. 5. A noise suppression device according to any one of claims 1 to 4. 6. The noise suppressing device according to claim 5, wherein the switching circuit unit is mounted on the noise suppressing device. The electric car includes a switch that opens and closes an electrical connection between the overhead wire and the inverter in a stage preceding the filter circuit,
3. The control unit generates a fourth signal for turning off the switch and outputs the fourth signal to the switch when a failure occurs in any component of the noise suppression unit. 7. The noise suppression device according to any one of 1 to 6. An electric vehicle control device comprising: the noise suppressing device according to claim 6; and a power conversion unit equipped with an inverter control unit that controls the operation of the inverter, the filter circuit, and the inverter,
The electric car includes a switch that opens and closes an electrical connection between the overhead wire and the inverter in a stage preceding the filter circuit,
The control unit generates a sixth signal including information indicating whether or not the noise suppression unit has failed, and outputs the sixth signal to the inverter control unit;
The inverter control unit generates a seventh signal for turning off the switch and outputs the seventh signal to the switch when the sixth signal indicates a failure of the noise suppression unit. Device. 7. An electric vehicle control device comprising: the noise suppressing device according to claim 5 or 6; and a power conversion unit equipped with an inverter control unit that controls operations of the inverter, the filter circuit, and the inverter,
The filter circuit comprises a filter capacitor,
The electric car includes a charging circuit unit that charges the filter capacitor,
The control unit generates a fifth signal for controlling the charging circuit unit to be off and outputs the fifth signal to the charging circuit unit when a failure occurs in any of the components of the noise suppressing unit. An electric vehicle control device characterized by: 7. An electric vehicle control device comprising: the noise suppressing device according to claim 5 or 6; and a power conversion unit equipped with an inverter control unit that controls operations of the inverter, the filter circuit, and the inverter,
the filter circuit comprises a filter capacitor;
The electric car includes a charging circuit unit that charges the filter capacitor,
The control unit generates a sixth signal including information indicating whether or not the noise suppression unit has failed, and outputs the sixth signal to the inverter control unit;
The inverter control unit generates a seventh signal for turning off the charging circuit unit and outputs the seventh signal to the charging circuit unit when the sixth signal indicates a failure of the noise suppressing unit. electric car controller.

Images