JPS5819101A - Protecting device in regenerative brake for electric motor vehicle - Google Patents

Abstract

PURPOSE:To enable to suppress an erroneous current variation detecting operation occurred upon protecting operation in a substation by controlling a chopper ON or OFF in response to the terminal voltage of a filter condenser upon reception of a detection signal from a discharge voltage detector. CONSTITUTION:When a load 9 is interrupted, a regenerative current IR flows to a filter condenser 10 and the overvoltage of the terminal of a filter condenser 10 is detected by an overvoltage detector 11, a thyristor 13 is conducted to form a discharge circuit. A comparison arithmetic unit 24 outputs a deviation signal Idef when the terminal voltage Vc of the condenser 10 detected by a discharge voltage detector 23 exceeds the set value Iref. A chopper controller 25 inputs the signal Idef, prevents the ON pulse of the chopper 2 and turns the chopper 2 OFF.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a maintenance device in an electric vehicle OFm live braking device ζ.

FIG. 1 shows a diagram of a general electric car's permanent braking system and its maintenance.

First, let's explain B raw braking. Steady operating condition ■KJ
I? - While keeping the traction motor O armature voltage at a value lower than the overhead line voltage, the tumbler device (hereinafter simply referred to as treader) turns on and off the snow at an appropriate frequency. Especially j14-evening current! Hold wing t**o*#c. Earth dragon #
The inductance (mainly the rising a
sms and main flat sliding axle 40 inductance)
C) When the voltage generated in the II armature, the induced voltage in the armature 1, and the O voltage value are higher than the overhead line voltage, a regenerative current flows through the flywheel diode and the filter reactor F6! Breath emits overhead wire y<*. This regenerative current 1. 11
17#c was amended via interrupter 8 and was taken to 9th load 9.

In a state #C like ζO, the interrupter 8 is interrupted due to any cause. As a result, the current flowing through the load 9 is abruptly interrupted. Shigashi.

Tee seal spit! The control system is unable to follow this change, and in order to maintain the current state, the road current #Il flows systematically.As a result, the main current x
1 flows into the filter capacitor W), and as a result, the voltage at the filter capacitor tlOO terminal rises rapidly.

To deal with this problem, the 1wt rice was designed to reduce the overvoltage (OmVX) using the following method. That is, when an overvoltage occurs in the 100-layer film I capacitor.

This overvoltage is not detected by the voltage detection circuit 11.

The O detection signal is given to the dart control circuit 15 & and the tip gate control circuit 16, respectively. Upon receiving the detection signal, the nine gate control circuit jll15 outputs a firing signal to the Niris $130 gate. When the p-thyristor unit is ignited by this ignition signal, a discharge circuit is formed by the current relay terminal, the t-iristor 13sP, and the resistor 14. Due to this discharge circuit, both layers of the filter capacitor 10 are short-circuited, so that the filter capacitor 10 is charged and the charges are discharged, and the terminal voltage of the filter capacitor 10 is thereby reduced.

On the other hand, the test tube control-j111 which received the 4 voltage detection signal
6. The on-pulse of the tip collar 2 is prevented and the tip collar 2 is controlled to be in the off state. Then, the 7-1 electric current XM decreases, and the charging electric power R generated by the filter capacitor twcm also decreases to 0 and finally becomes zero. In this way, the voltage increase across the filter capacitor 100 is suppressed.

O friend, discharge am is formed and friend discharge electric power 11! In flows, and its relay 12 is energized by this voltage It ID . The main motor circuit is interrupted in conjunction with the energization of the electric accent rail. That is, the energization of the current relay 12 causes the unit switch 17 to be quickly interrupted, and then the unit switch 19 to be interrupted.

As described above, it can be said that the conventional IU device has a great suppressing effect when it comes to suppressing overvoltage. The problem is that when a substation is seen in the power transmission system during winter, there is a risk that the substation's current fluctuation detection operation (hereinafter referred to as ΔI detection) may be incorrect in relation to the protection operation. There is.

That is, first, the cause of the @ motion will be described.

FIG. 2 shows the operation of the above-mentioned protection device (FIG. 1) using current and voltage waveforms, and shows the factors involved. In FIG. 2, the overhead wire current Ijs) is the terminal voltage We of the filter capacitor 10.
, (@) indicates the motor current IM.

Let us now assume that the load is interrupted at time t1. Then, the 2-ilter capacitor voltage We increases, and the time mtmK
The overvoltage detection device 4 is activated (1s2 Fig. 3)). Missing number ζ, as mentioned above, the filter by ignition of ζζt iristor audience;
As a result, the base of the current 4-1 attenuates at 14t (Fig. 2 (@)). When the thyristor is ignited, the current In flows from the overhead wire 7 side, and the overhead wire current IJ rapidly rises accordingly (FIG. 2(a)). Normally, the main current II flowing out to the overhead line 7 side is applied to the overhead line current flLIj, and a change in the overhead line current IjO occurs in a very short period of time (second Figure) 1 time t, ~t, leap change). ζ0Jll! A sudden change in the line current IjO will eventually cause a ΔI detected malfunction in the nine-degree power station number ζ connected to MM7. In reality, there have been several cases where ΔI detected malfunctions occurred at substations due to such causes. An example of the 7O^ body is shown in Figure #I3.

In Figure 111I3, the same vehicle is performing a regenerative operation], and at this time, the regenerative current 11! shown by the solid line! @ flows into Kagyoshasha. There is no flow of electricity from the substations to the power running vehicle 4, which maintains a voltage higher than the voltage drawn from the Sekiu Nakahiro substation 40. Now, suppose that a load cutoff occurs for some reason.

As mentioned earlier, the regeneration control device (Iris 1st section) performs a protective operation. Dew 2 due to this protection 1IIIi1 production
As shown in W7A(4), a sudden increase in the electric current occurs, and the electric current I shown by the value - flows from the substation 22 into the regeneration wheel 2. KO and 龜01 纏电 #IO rounding with a large amount of change,
This happens because an accident occurs in substation 4 that causes the delta detection to malfunction.

Grow up, book! During testing of electric vehicle brake conditions and OH coating, the main load was reduced to breath mold, and the protective device was removed during the heating process. Due to the construction, O1R fluctuation detection of substation O1R was carried out to prevent malfunction.
Serving M is considered a trick.

Hereinafter, the present invention will be described in detail based on two points.

<Structural strength> Astray: Indicates protection by 111K of the original eel. ), j13111&csp, and every minute different from the 11th, set the value for each meal and add it to the axis. Therefore, the part l of fFil- is given the same symbol,
The explanation of 10 will be omitted.

In FIG. 3, the discharge voltage detection circuit & detects the four-element voltage of the filter capacitor flo. Obtained ratio detection signal Vt
d is input to the comparator. Comparison 6: The preset value %@f is found in the input signal on the other hand, and the detection signal IC exceeds the set value Vrd.
(Vcd >Vref), the comparison calculator sends the deviation signal Vdef to the output gate control circuit 3. The desired width control circuit 25 receives the deviation signal Vdd, blocks the on-pulse of the chopper 2, and turns the chopper 2 off.

On the other hand, when the discharge circuit is turned off due to the ignition of the Nyristor UO, 1 and 2 are turned off by the UKf release.
8 terminal voltage attenuates, and the detection signal Vd0I[ becomes the set value v
lower than r@f (Mad < Vr@f) t,
, nine cases, biased! ! When the signal Vd@f becomes 0 or less, the summer gate tai*a*25 stops blocking on-pulses. Soe)w! As a result, Chiyotsupa 2 started operating again.

Start regenerative braking. This regenerative braking is performed using Nyristaro and resistance pressure as loads.

<Function> One of the disadvantages of conventional holding devices is that the voltage at the terminal 100 of the filter decreases due to the protective operation against interruption due to loading, and the current R flows in from am@e-. According to the above-described configuration based on the single-source F14, the inflow of current from the overhead wire side is blocked.In other words, when the terminal voltage of the filter T8 is attenuated and becomes less than the set value Vr@f, the chopper 2 Since the motor starts operating with the resistor !5t15 as a load, the motor current M flows from the armature I+1 to the resistor 15, resulting in a so-called dynamic braking state.Therefore, the terminal voltage of the filter capacitor 10 is equal to the dynamic braking state. Since the motor current IMk due to ζζ is raised by the voltage drop across the resistor 15, the inflow from the am side is blocked.

Ota. At this time, depending on the on state of the cap 20, it is unlikely that the voltage will be in a low voltage state. [This is because the resistor 15 acts as a load.

The above operation will be further explained using FIG. 5. It is assumed that the load 9 increases at time t11c and the interruption occurs.

Then, the terminal voltage We of the filter capacitor +10 rises, and the overvoltage detection device 4 operates at time tm (FIG. 5, 6)). Next, the filter capacitor 10 is discharged and the chopper 2 is turned off #ζ> The motor voltage IL IM II is reduced to zero at time t. Next, since the terminal voltage Va of the filter capacitor t10 also begins to attenuate from time 44, the comparator 2416 & O deviation signal emf becomes zero. At time t4, the chopper 8 starts operating again. Then, the motor current IM rises (see Fig.
@)). Therefore, the current In a flowing into the overhead wire side becomes zero at interruption times t and k (jlIls
In Figure (a)), the current 1 does not flow in from the Jll line side. Current flows in from the overhead wire side, so O is 1 time t
At the point l, that is, when the unit switch is closed, the motor circuit is cut off and the motor circuit is shut off (Fig. 5(a)).

In this way, the amount of change in M-electron RItO (see Fig. 5) is the value of Ijm at time t1, Ij at t.
m('value), the amount of ζ that changes in a short period of time can be suppressed to less than half compared to the quantity l shown in Figure 2. The occurrence of malfunctions can be reduced.

<effect> As mentioned above) 1. According to the present invention, the regenerative braking eccentricity can be maintained.

[Brief explanation of the drawing]

111ti A conventional general circuit diagram showing the structure of the regenerative braking value amount and the structure of the protection device, Figs.
FIG. 4 is a circuit diagram showing an example of triggering a detection@operation, and FIG. jIs diagram-) to (e)Id are rounding waveform diagrams illustrating the operation. 1...Armature, 2...Top flange, 3...Field winding, 10...Filter capacitor-$1", 11...Overvoltage detection device, 13...t Iristor, 15... Gate control circuit, n... Discharge voltage detection circuit, A... Comparison wave 1/I14!), 25... Chopper gate control circuit. Figure 3 4M

Claims (1)

[Claims] Filter circuit with fill-signature t, traction motor O
The above-mentioned fill p:
? Overvoltage detection device 7 for detecting o terminal voltage, flljE
A large O switch element forms a discharge circuit by connecting both ends of the fill I connector 10, and a signal for controlling the opening/closing of the switch element O is output by the detection No. 1 0 output of the overvoltage detection eccentricity. In the switch control field and visible protection device. The filter; Detects the O4 voltage and detects the voltage that decreases with discharge due to the 111th discharge gate. Discharge voltage detection path and ζ0 discharge voltage detection path O detection value 4
The electric vehicle is characterized in that the electric vehicle is characterized in that the electric vehicle is characterized by comprising: a gate control gate control circuit for automatically controlling off the gate position O in response to the filter; O. Regeneration control/II protection device #4 in prosthetic device.