JPS6311001A - Controller for electric rolling stock - Google Patents

Abstract

PURPOSE:To detect the service interruption of a trolley wire or the trouble of a PWM (pulse width modulation) converter circuit quickly and precisely by detecting, arithmetically operating and comparing the AC side power and DC side power of the PWM converter circuit. CONSTITUTION:A power detector PD1 is connected on the input side of a PWM converter circuit CONV, and a power detector PD2 is connected on the output side of the PWN converter circuit CONV. Outputs from the power detector PD1 and the power detector PD2 are inputted to a comparator REF, and an output signal from the comparator REF is inputted to a trouble detector KD as a stop signal SS for the converter circuit and an inverter circuit. A voltage detecting value VS by a voltage detector VD1 is inputted to a stringing service- interruption detector TD, and an output signal from the stringing service- interruption detector TD is inputted to the trouble detector KD as a stringing service-interruption signal TS. The trouble detector KD outputs a trouble signal KS in response to the stringing service-interruption signal TS and the stop signal SS.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to an AC electric vehicle having a pulse width modulation converter circuit, and particularly to a fault detection method for detecting an abnormality in the pulse width modulation converter circuit. This invention relates to a control device for an electric vehicle that controls the vehicle.

(Prior art) Pulse width modulation (hereinafter referred to as PWM)] In an AC electric vehicle using an inverter circuit and an inverter circuit, AC power received from a current collector is converted to PWM via a transformer and a reactor.
It is input to the WM converter circuit. The DC output of the PWM converter circuit is connected to the inverter circuit via a capacitor 1y. The three-phase AC output of the inverter circuit is connected to an induction motor. In the AC electric vehicle configured as described above, the current collector may become separated from the track especially during regenerative braking, or when traveling in a non-pressurized section such as an AC-AC section.
The route for regenerative power may be lost.

As a result, the DC voltage of the capacitor and the AC voltage of the transformer rise, resulting in overvoltage and damage to the equipment.

Therefore, it is necessary to promptly detect an overhead line power outage and stop the inverter circuit and the P-VM converter circuit. Further, it is also necessary to stop the inverter circuit when the PWM converter circuit breaks down and power regeneration operation becomes impossible.

Conventionally, overhead line power outage is detected by detecting the AC input voltage of a PWM converter circuit. Alternatively, this can be done by detecting capacitor voltage and transformer overvoltage.

(Problem to be solved by the invention) Generally, PWM converter circuits are operated in synchronization with an AC power supply, and for this purpose, a synchronous power supply filter is used to generate a synchronous signal of 1q, but when the overhead power is cut off, the filter remains. If there is a signal, the PWM converter circuit continues its operation in synchronization with this shooting.

Furthermore, when the PWM converter circuit operates, even if there is no power on the overhead line side, the voltage of the capacitor on the output side will cause the PWM
The M converter circuit generates an alternating voltage on the alternating current input side. Therefore, the voltage is applied to the synchronous power supply filter, and the output of this synchronous power supply filter is input to the control circuit of the PWM converter circuit, and operation continues in synchronization with the AC voltage generated by the PWM converter circuit itself. Therefore, it is difficult to detect AC voltage and determine whether there is an overhead line power outage based on the presence or absence of AC voltage.

On the other hand, a possible method for detecting an overhead power outage is to detect when the voltage of the capacitor and the voltage of the transformer reach set values. However, this setting value is set somewhat high to avoid false detection. Therefore, it is not possible to set the set value near the steady value in order to improve the detection accuracy.

In this way, it is difficult to detect an overhead line power outage with high accuracy by detecting the voltage of the capacitor and the voltage of the transformer.

An object of the present invention is to provide an electric vehicle control device having an overhead line outage detector and a failure detector that can accurately detect an overhead line outage and detect a failure in a PWM converter circuit, and can perform highly reliable detection. The goal is to provide the following.

[Structure of the invention]

(Means for solving the problems) FIG. 1 shows a conceptual diagram of the present invention. The PWM converter circuit C0NV is connected to the current collector PAN via a transformer TR. The inverter circuit INV is connected to PW via the capacitor CO.
Connect to the output side of M converter circuit C0NV. Guided lightning! The l1 machine IM is connected to the output side of the inverter circuit INV. A power detection device 3PD1 is connected to the input side of the PWM converter circuit C0NV. Also, PWM converter circuit C
A power detector PD2 is connected to the 0NV output side. The outputs of power detector PD1 and power detector PD2 are output from comparator R.
Enter into EF. The output signal of the comparator REF is input to the failure detector KD as a stop signal SS for the converter circuit and inverter circuit. Further, the voltage detection value VS by the voltage detector VD1 is input to the overhead line power failure detector TD. The output signal of the overhead line power outage detector TD is inputted to the failure detector KD as an overhead line power outage signal TS. Fault detector KD receives fault signal KS
Output.

(Function) The PWM converter circuit C0NV converts the AC power obtained from the current collector PAN through the transformer TR into AC power, and supplies the AC power to the inverter circuit INV through the capacitor CO.

Inverter circuit INV is PWH converter circuit C0NV
The obtained DC type horn is converted into three-phase AC power and supplied to the induction motor IM.

Power detector PDI detects the power on the input side of PWM converter circuit C0NV and outputs the value to comparator REF. Moreover, the power detector PD2 is the PWM converter circuit C0.
Find the output side power of NV, and convert the output power of MO (17i) to the comparator REF.
Output to. Comparator RE F is P converter circuit C0
The input side power and the output side power of the NV are compared, and when the difference between the two reaches a predetermined value, a stop signal SS for the converter circuit C0NV and the inverter circuit INV is output.

The overhead line power outage detector TD detects the overhead line power outage signal TS when the detected voltage value vS disappears.

The failure detector KD detects the converter circuit C0NV and the inverter circuit INV when the overhead line power outage signal TS is not input.
When the stop signal SS is input, the failure signal KS is output.
Ru.

(Example) An example based on the present invention will be described using the drawings. P.W.
The M converter circuit C0NV is connected to the current collector PAN via a transformer TR and a reactor L. This PWM converter circuit C0NV has a gate turn-off thyristor T1.
．． T2. T3. T4 and diode D1. D2. D3.
It is composed of D4. PWM converter circuit C0NV
A capacitor CO is connected to the output side of the inverter circuit INV. This inverter circuit INV
is the gate turn-off thyristor T11. T12゜T13
．． T14. T15. Tla and diode D1
1°D12. D13. D14. D15. Dle
The induction motor IM is composed of an inverter circuit I
Connected to the output side of NV.

A voltage detector MDI that detects an input voltage and a current detector CT1 that detects an input current are provided on the input side of the PWM converter circuit C0NV. Furthermore, a voltage detector VD2 for detecting the output voltage and a current detector CT2 for detecting the output current are provided on the output side of the PWM converter circuit C0NV.

The voltage detection value VD by the voltage detector VD2 and the current detection value IL by the current detector CT2 are input to the power detector PD2. This power detection mPD2 is formed 414 times by an interrupter MXI and an integrator IT1.

11) Calculator MX1 calculates voltage detection value VD and current detection value IL.
is input, calculated, and output to the integrated integrator ITI. The integrator ITI outputs its output to the comparison mREF as the output of the power detector PD2. Further, the voltage detection value VS by the voltage detector VD1 and the current detection value Is by the current detector CTI are input to the power detector PD1. This power detector PDI is the same as the power detector ZPDI.
and an integrator IT2. This power detector P
The output of D1 is input to comparator REF.

Comparator REF is composed of arithmetic unit COM and voltage detector VD3. The calculator COM inputs the outputs of the power detector ZPD1 and the power detector PD2, and calculates the difference between the two. Arithmetic unit COM outputs its output to voltage detector VD3.

Voltage detector VD3 outputs a stop signal SS for converter circuit C0NV and inverter circuit INV when the output of arithmetic unit COI'v1 reaches a predetermined value.

The overhead line power outage detector TO is connected to the voltage detector VD1, and its output is input to the fault detector KD.

The fault detector KD consists of a delay circuit DL, an inverter IN and an AND
The circuit AD is configured with J. The output of comparator REF is input to AND circuit AD via delay circuit DL. Further, the output of the overhead line power failure detector TD is input to the AND circuit AD via the inverter IN. The output of this AND circuit AD is output as a failure signal.

The synchronous power supply filter FL distorts the waveform of the AC voltage input from the current collector PAN, and outputs a signal synchronized with the cycle of the AC voltage to the integrator IT1. Output to IT2.

Above) The operation of the embodiment will be explained based on the small configuration.

The converter circuit C0NV is activated by the activation command, converts the AC power received from the current collector PAN via the main transformer TR into DC power, and supplies the DC power to the inverter circuit INV. When the DC voltage that is the output of the converter circuit C0NV is kept constant, the inverter circuit INV is controlled by the inverter control circuit (
Illustrated t! tsu. ) and supplies AC power to the induction motor IM.

The hooking device MX2 receives the voltage detection value VS of the voltage detector VD1 connected between the secondary windings of the transformer TR and the current detection value Is of the current detector 0-1 connected to the AC input side of the PWM converter C0NV. Enter. The converter MX1 performs a calculation on the detected voltage value vS and the detected current value Is and outputs the node result to the integrator IT2. The integrator IT2 calculates the AC l power every half cycle period of the AC input power supply based on the output signal of the synchronous power supply filter FL. The integrator IT2 outputs the fault result to the comparator REF.

Kake nAM X 1 HaP WM Ko'/ /'1'
1 Voltage detector VD connected to the DC side of the circuit C0NV
The voltage detection value VD of No. 2 and the current detector IL of current detector CT2 are input. The m calculator MXI multiplies the voltage detection value VD and the strawberry flow detection value IL, and outputs the calculation result to the integrator rT1. The integrator ITI calculates DC power during a half-cycle period of the AC input power supply based on the output signal of the synchronous power supply filter FL. Integrator IT1 outputs the calculation result to comparator REF.

The operator COM inputs the output of the power detector PCI and the output of the power detector P[)2. And the computing unit COM is PW
It calculates the AC power on the AC input side and the DC power on the DC output side of the M converter circuit C0NV, and outputs the calculation result to the voltage detector VD3. Voltage detector VD3 outputs a stop signal SS for converter circuit CONV and inverter circuit INV when the difference between AC power and DC power reaches a predetermined value.

Next, we will explain what happens when an overhead line power outage occurs.

Since the PWM converter circuit C0NV is controlled so that the power factor is always kept at 1, the AC side power and the DC side power are approximately equal after subtracting the share due to internal loss.Here, When an overhead line power outage occurs, the AC side power becomes zero, but since the large capacity capacitor CO is in contact with the DC side, current continues to flow in and out of the PWM converter C0NV.Therefore, the arithmetic unit COM When the output of increases and reaches a predetermined value, voltage detector VD3 sends a stop signal SS to the converter control circuit (not shown) to converter circuit C0NV and inverter circuit INV.
and output to an inverter control circuit (not shown). The converter control circuit and inverter control circuit stop the converter circuit CONV and the inverter circuit INV based on the stop signal SS. PW when overhead line power outage occurs
The AC side input voltage of the M converter circuit C0NV becomes a star.

Therefore, the voltage detection 1st line VS of the voltage detector MDI also becomes zero. As a result, the overhead line power outage detector is connected to the overhead line )-shaped signal T.
Output S. When the AC power from the G line is reapplied to the transformer TR, the overhead line power outage detector outputs the overhead line power outage signal TS8.
unlock.

Next, a case where the P~v~1 converter circuit CO'NV fails will be described. If the PWM converter circuit CON is unable to perform force control normally for some reason, the power of the AC side power and the DC side power of the P'vVM converter circuit CONV increases. When this difference reaches a predetermined value, the voltage detector V D 3 (or the stop signal S
Output S. This stop signal SS is input to a converter control circuit, an inverter, and a lil control circuit (not shown). Also, the stop signal SS is sent to A N via the delay circuit DL.
It is input to D circuit AD. On the other hand, since the voltage detection voltage VS of the voltage detector VD1 is not zero, the output signal of the overhead line power failure detector TD is at the l L l level. Therefore, inverter I
The output signal of N becomes “H° level.A N D circuit A
D inputs from the comparison mREF the stop signal SS at the H level and the output signal at the "T1" level from the inverter IN.

As a result, AND circuit AD outputs failure signal KS.

That is, this fault signal KS is transmitted to the PWM converter circuit C.
When the difference between the AC side input power of 0NV and the DC side output power becomes a predetermined value and there is an AC side voltage of the PWM converter circuit C0NV, it is output from the failure detector KD.

The delay circuit DL connects the PWM converter circuit C in the event of an overhead power outage.
0NV stops and until the overhead line power failure detector TD outputs the “H” level overhead line power failure signal TS, i L
+ level signal is input to AND circuit AD. This prevents the & signal from being output erroneously in the event of an overhead power outage 11.1N.

〔Effect of the invention〕

1) In an AC electric car that has a WM converter circuit as an AC/DC converter, detecting, deriving, and comparing the AC side power and DC side power of the PWM converter circuit.
It is possible to promptly detect a power outage in the overhead line or a failure in the PWM converter circuit, thereby protecting the equipment.

[Brief explanation of the drawing]

FIG. 1 is a conceptual diagram of the present invention, and FIG. 2 (J) is a block diagram of one implementation of one series of electricity control system based on the present invention. C0NV... PWM converter circuit INV... Inverter circuit Pi )1. PD2...Power detector RI...Comparator KD...Failure detection circuit TD...Overhead power outage detection circuit Agent Patent attorney Ken Ken Chika January Hirofumi Mitsumata

Claims (1)

[Scope of Claims] A converter circuit that converts AC power from a current collector into DC power via a transformer; DC power is input from the converter circuit via a capacitor, converted to AC power, and supplied to an induction motor. a first inverter circuit that detects input power on the input side of the converter circuit;
a second power detector for detecting output power on the output side of the converter circuit;
outputting a stop signal to the converter circuit and the inverter circuit when the difference between the input power and the output power of the converter circuit detected by the first and second power detectors exceeds a predetermined value. a comparator; an overhead line power outage detector that outputs an overhead line outage signal when detecting that the input voltage of the converter circuit disappears; A control device for an electric vehicle, comprising: a failure detector that outputs a failure signal when only a stop signal, which is the output of a comparator, is input.