JPH08172705A - Electric railcar controller - Google Patents

Abstract

PURPOSE: To eliminate uncomfortable feeling to a user by raising the frequency of an inverter and lowering noise when departing from a platform. CONSTITUTION: The electric railcar controller comprises a variable voltage variable frequency control type inverter 5, an induction motor 6 driven by the output of the inverter to travel a train, a gate controller 7 for controlling the switching gate of the inverter and an auxiliary circuit 10 for setting the switching frequency of the inverter to a value higher than the value of the normal time only at the time of starting the motor 6. The switching frequency of the controller 7 to the inverter is set to a value higher than the value of the normal time until the rotating speed of the motor 6 reaches the predetermined value until a predetermined time is elapsed after the circuit 10 starts the motor 6. Thus, then the noise of the train generated from the inverter at the time of departing can be lowered.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric vehicle controller having an induction motor driven by an inverter of a variable voltage variable frequency control system.

[0002]

2. Description of the Related Art Generally, in an electric vehicle in which an induction motor is driven by an inverter of a variable voltage variable frequency control (hereinafter referred to as VVVF) system to drive the vehicle, the switching frequency of the inverter is adjusted according to the rotation frequency of the electric motor. The speed of the vehicle is controlled by changing the speed. Then, the average switching frequency of the inverter until the motor is started up, accelerated, and then decelerated to stop is kept at a relatively low frequency in consideration of the heat generation, and even at the time of startup with a relatively high frequency, at most, It is about 400 Hz.

[0003]

However, in such a conventional electric vehicle controller, the inverter of the above-mentioned inverter 4 is used.
The switching frequency band of about 00Hz becomes noise, and when the vehicle is traveling at high speed, it is not perceived as noise that is relatively annoying because it is drowned out by the running noise, but the vehicle is stopped at the station platform. When the induction motor is started from the state and the vehicle starts, the noise of the inverter is heard by people on the platform because the running noise is low.
There was a problem that caused discomfort.

The present invention has been made in view of the above-mentioned conventional problems, and when the induction motor is started, the switching frequency of the inverter is temporarily set to a value higher than that of the normal time so that the inverter can be operated at a higher frequency. It is an object of the present invention to provide an electric vehicle control device that reduces noise emitted and does not cause people on the platform to feel uncomfortable when the vehicle departs.

[0005]

According to another aspect of the present invention, there is provided an electric vehicle control device for controlling an induction motor driven by an output of a variable voltage variable frequency control type inverter to drive a vehicle and a switching gate control of the inverter. It is provided with a gate control circuit and an auxiliary circuit that sets the switching frequency of the inverter to a value higher than the normal value only when the induction motor is started.

According to a second aspect of the present invention, in the electric vehicle controller according to the first aspect, the auxiliary circuit keeps the switching frequency of the inverter higher than the normal value until the rotation speed of the induction motor reaches a predetermined value. It is set to a value.

According to a third aspect of the present invention, in the electric vehicle controller of the first aspect, the auxiliary circuit keeps the switching frequency of the inverter higher than the normal value until a predetermined time elapses after the induction motor is started. It is set to a value.

According to a fourth aspect of the present invention, in the electric vehicle control device according to the first aspect, a predetermined time elapses after the auxiliary circuit starts the induction motor and until the rotational speed of the induction motor reaches a predetermined value. During this period, the switching frequency of the inverter is set to a value higher than the normal value.

According to a fifth aspect of the present invention, in the electric vehicle controller according to any one of the first to fourth aspects, the auxiliary circuit sets the switching frequency given to the inverter to an integral multiple of 2 of the normal value. .

[0010]

According to the electric vehicle controller of the present invention, the switching frequency applied to the variable voltage variable frequency control type inverter is controlled by the gate control circuit, and when the induction motor is driven, only when the induction motor is started, the auxiliary electric power is supplied. The circuit sets the switching frequency of the inverter to a value higher than the normal value. This reduces the noise generated by the inverter when the vehicle departs when the vehicle is running low and the noise of the inverter is easily heard by people on the platform.

In the electric vehicle controller according to the second aspect of the present invention, the auxiliary circuit sets the switching frequency of the inverter to a value higher than the normal value until the rotation speed of the induction motor reaches a predetermined value. As a result, the noise generated by the inverter when the vehicle departs is reduced.

In the electric vehicle controller according to the third aspect of the present invention, the auxiliary circuit sets the switching frequency of the inverter to a value higher than the normal value until a predetermined time elapses after the induction motor is started. As a result, the noise generated by the inverter when the vehicle departs is reduced.

According to another aspect of the electric vehicle controller of the present invention, the auxiliary circuit of the inverter is used until a predetermined time elapses after the induction motor is started and until the rotational speed of the induction motor reaches a predetermined value. By setting the switching frequency to a value higher than the normal value, the noise generated by the inverter when the vehicle departs is reduced.

According to another aspect of the electric vehicle controller of the present invention, the auxiliary circuit can be realized with a simple structure by setting the switching frequency given to the inverter by the auxiliary circuit to be an integral multiple of 2 of the normal value. ing.

[0015]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows a circuit configuration of an embodiment of the electric vehicle control device of the present invention. High-voltage AC power is taken from an overhead line 1 to a main transformer 3 via a pantograph 2 and stepped down. A configuration in which a predetermined direct current power is converted into direct current, and further a direct voltage-alternating current is converted by the VVVF inverter 5 to obtain alternating current power with a variable voltage and variable frequency, which is supplied to the induction motor 6 to be driven to drive the vehicle. Is.

A gate control circuit 7 is provided to control the switching gates of the converter 4 and the inverter 5.
And a speed command unit 8 (for example, a mass controller) for giving a speed command to the gate control circuit 7, and a speed detector 9 for detecting the rotation speed of the induction motor 6 as a vehicle speed, As a characteristic part of the present invention, an auxiliary circuit 10 for correcting the switching frequency of the gate control circuit 7 only when the induction motor 6 is started to start the vehicle.
Is provided.

A detailed circuit configuration of the gate control circuit 7 and the auxiliary circuit 10 is shown in FIG. In FIG. 2, the gate control circuit 7 inputs and compares the speed command 8a from the speed command unit 8 and the vehicle speed signal 9a from the speed detector 9 of the induction motor 6 to match the induction motor 6 to the speed command 8a. The basic switching signal setting unit 11 calculates the switching frequency of the inverter 5 necessary for the operation and outputs it as the basic switching signal fc.

As elements constituting the auxiliary circuit 10,
A single shot multi that outputs 1 as a binary signal as a gate signal for a predetermined time (only 10 seconds in this embodiment) until the timer 11 counts up after receiving the gate start signal 8b from the speed command unit 8 The vibrator 13 and the vehicle speed signal 9a are compared with a comparison speed (a value of 15 km / h in this embodiment) provided by the comparison speed setting device 14, and 1 is output as a binary output while the comparison speed is higher. AND which takes the logical product of the outputs of the device 15, the single-shot multivibrator 13 and the comparator 15.
A circuit 16 is provided.

Further, as the elements of the auxiliary circuit 10, a normal coefficient setting device 17 for giving 1 as a multiplication multiplier, a starting coefficient setting device 18 for giving 2, and a normal coefficient setting device when the binary output of the AND circuit 16 is 0. Switch 17 that switches to the coefficient setting device 18 side at startup when the binary output is 1
And a multiplier 20 for multiplying the basic switching signal fc from the basic switching signal setting unit 11 and the output signal of 1 or 2 times from the switch 19, and this multiplier 2
A control switching signal output unit 21 that outputs the output of 0 as the control switching signal fca is provided.

Next, the operation of the electric vehicle controller having the above structure will be described. FIG. 3 shows an operation timing chart of each part. When a start command, that is, a start command is input from the speed command part 8, this is input to the single-shot multivibrator 13 as a gate start signal 8b, and the single-shot multivibrator 13 is input. Outputs a binary output of 1 to the AND circuit 16 for 10 seconds defined by the timer 12.

When the inverter 5 and the electric motor 6 are stopped and the vehicle is stopped, the vehicle speed 9a is 0 km / h, and when the inverter 5 is activated and the electric motor 6 is driven, the vehicle speed 9a is gradually increased. . This vehicle speed 9a is compared with a predetermined comparison speed of 15 km / h in the comparator 15, and the vehicle speed 9a is lower at the beginning of startup, so the comparator 15 outputs a binary output of 1
Is output to the AND circuit 16.

Therefore, the AND circuit 16 has 10
There is a time up of 2 seconds, or the vehicle speed is 15 km
The binary output of 1 is given to the switch 19 until / h is exceeded.

When the switch 19 receives the signal of 1, the switch 19 switches to the start-time coefficient setting unit 18 side to output a double multiplier signal to the multiplier 20, and the multiplier 20 changes the frequency of the basic switching signal fc. A control switching signal fca having a frequency doubled is generated, and this control switching signal fca is output from the control switching signal output unit 21 and given to the inverter 5, and the inverter 5 outputs the normal switching signal 2ca.
It will be gated by a doubling frequency switching signal.

Therefore, the inverter 5 is normally operated at 40
Gate control is performed at a frequency of about 0 Hz to 800 Hz, which is twice that of the frequency of 0 Hz, and the noise generated is reduced. Therefore, when the vehicle departs from the state where the vehicle is stopped on the platform, the noise from the inverter is not heard by the people on the platform and does not cause discomfort.

When 10 seconds have passed from the start-up, or when the vehicle speed exceeds 15 km / h, the binary output of the AND circuit 16 becomes 0, and the switch 19 is switched to the normal time coefficient setter 17 side so that it becomes 1 time. Normal multiplier signal to multiplier 2
0, and the multiplier 20 outputs the basic switching signal fc.
The control switching signal fca having the same frequency as the frequency is generated and output from the control switching signal output unit 21, and the inverter 5 is gate-controlled by the normal switching signal having a relatively low frequency.

In this case, a certain amount of time has passed since departure and the vehicle is away from the platform, so that people on the platform no longer hear the noise of the inverter, and the vehicle speed is increasing, so the running noise on the vehicle side is increased. And the noise generated by the inverter is drowned out, and passengers are not uncomfortable.

As described above, according to the electric vehicle control device of this embodiment, the inverter 5 is operated at a frequency of about 400 Hz during normal operation until 10 seconds elapses from start-up or until the vehicle speed exceeds 15 km / h. Twice that 800Hz
It is gated at a moderate frequency, produces less noise, and when the vehicle departs from a stop on the platform, the noise from the inverter will not be heard by people on the platform and will not cause discomfort.

Further, the reason why the control switching frequency of the inverter is set to be twice as high as that in the normal time is that the control for making it an integer multiple of 2 of the normal switching frequency is technically simple.

The present invention is not limited to the above-described embodiment, and the control is performed such that the switching frequency is increased for a fixed time after the inverter is started, or the switching frequency is increased until the vehicle speed becomes equal to or higher than a predetermined speed. It is also possible to adopt a configuration in which each of the controls for increasing the is independently performed.

Further, the set time of the timer after starting is not limited to 10 seconds, and can be arbitrarily determined as needed,
Further, the comparison speed is not limited to 15 km / h and can be arbitrarily determined. Further, the multiplication factor for increasing the frequency of the inverter at the time of startup is not particularly limited to the integral multiple of 2 and can be arbitrarily determined.

[0031]

According to the first aspect of the present invention, when the induction motor is driven by controlling the switching frequency given to the variable voltage variable frequency control type inverter by the gate control circuit, the auxiliary circuit is provided only when the induction motor is started. The switching frequency of the inverter is set to a value higher than the normal value by the so that the running noise of the vehicle is low and the noise of the inverter is easily heard by people on the platform. It can be lowered so that people on the platform are not annoyed by the noise of the inverter.

According to the second aspect of the present invention, the auxiliary circuit sets the switching frequency of the inverter to a value higher than the normal value until the rotation speed of the induction motor reaches a predetermined value. Therefore, the noise generated by the inverter can be kept low until the speed of the vehicle starts to increase to a certain degree and the noise generated by the inverter is drowned out by the running noise. It is possible to reduce the noise generated by the inverter when the vehicle departs, which is easy for the people on the platform to hear, so that the people on the platform do not feel uncomfortable due to the noise of the inverter.

According to the third aspect of the present invention, the auxiliary circuit sets the switching frequency of the inverter to a value higher than the normal value until the predetermined time elapses after the induction motor is started. Therefore, the noise generated by the inverter can be suppressed to a low level until the vehicle leaves the platform when the vehicle departs, the running noise of the vehicle is low, and the noise of the inverter is easily heard by people on the platform. At times, the noise generated by the inverter can be reduced, so that people on the platform will not feel uncomfortable due to the noise of the inverter.

According to the invention of claim 4, the auxiliary circuit changes the switching frequency of the inverter until a predetermined time elapses after the induction motor is started and until the rotation speed of the induction motor reaches a predetermined value. Since it is set to a value higher than the normal value, when the vehicle departs, the traveling sound of the vehicle is fast enough to eliminate the noise generated by the inverter, or the vehicle leaves the platform. The noise generated by the inverter can be kept low until the people on the platform can no longer hear the noise generated by the inverter, and the running noise of the vehicle is low, and the noise of the inverter is easily heard by the people on the platform. The noise can be reduced, making people on the platform uncomfortable with the noise of the inverter. It can be made strange.

In the electric vehicle controller according to the fifth aspect of the present invention, the auxiliary circuit sets the switching frequency applied to the inverter to an integral multiple of 2 of the normal value, so that the auxiliary circuit can be realized with a simple configuration. .

[Brief description of drawings]

FIG. 1 is a circuit block diagram of an embodiment of the present invention.

FIG. 2 is a block diagram showing a detailed circuit configuration of a control circuit and an auxiliary circuit of the above embodiment.

FIG. 3 is a timing chart of the inverter control operation of the above embodiment.

[Explanation of symbols]

 1 Overhead Wire 2 Pantograph 3 Main Transformer 4 Converter 5 Inverter 6 Induction Motor 7 Gate Control Circuit 8 Speed Command Section 9 Speed Detector 10 Auxiliary Circuit 11 Basic Switching Signal Setting Section 12 Timer 13 Single Shot Multivibrator 14 Comparative Speed Setting 15 Comparator 16 AND circuit 17 Normal coefficient setter 18 Start-up coefficient setter 19 Switch 20 Multiplier 21 Control switching signal output section

Claims (5)

[Claims] 1. An induction motor driven by an output of a variable voltage variable frequency control type inverter to drive a vehicle, a gate control circuit for performing switching gate control of the inverter, and the inverter only when the induction motor is started. An electric vehicle control device comprising: an auxiliary circuit for setting the switching frequency of the power supply to a value higher than the normal value. 2. The auxiliary circuit sets the switching frequency of the inverter to a value higher than a normal value until the rotation speed of the induction motor reaches a predetermined value. The electric vehicle control device described. 3. The auxiliary circuit sets the switching frequency of the inverter to a value higher than a normal value until a predetermined time elapses after the induction motor is started. The electric vehicle control device described. 4. The auxiliary circuit normally sets the switching frequency of the inverter until a predetermined time elapses after the induction motor is started and until the rotation speed of the induction motor reaches a predetermined value. The electric vehicle control device according to claim 1, wherein the electric vehicle control device is set to a value higher than the value. 5. The electric vehicle control device according to claim 1, wherein the auxiliary circuit sets a switching frequency applied to the inverter to an integral multiple of 2 of a normal value.