JPS6216002A - Controller for inverter electric rolling stock - Google Patents

Abstract

PURPOSE:To omit a switching means having large conduction capacitance by initially charging a filter capacitor by an auxiliary charging equipment. CONSTITUTION:When a power running command or a braking command is outputted, a chopper CH and a thyristor ThC for an auxiliary charging equipment Amux.Chg are controlled,and a capacitor CF for a filter is charged until terminal voltage VCF approximately reaches trolley voltage VS. Voltage is charged to the capacitor CF, and a switching means L1 is closed while gates for the chopper CH and the thyristor ThC are stopped. The voltage VC of the capacitor for the filter is approximately the same as trolley voltage VS at that time, thus generating vibration by a reactor Lr and the filter capacitor CF is not generated.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a control device for an inverter electric vehicle, and particularly to a control device for an inverter electric vehicle suitable for initially charging a filter capacitor.

[Background of the invention]

In the inverter electric vehicle, a filter circuit including a reactor L and a capacitor C2 is provided on the power source side in order to suppress harmonic current on the overhead line power source side. When the inverter electric vehicle is running or when regenerative braking is started, initial charging is always required to charge the filter capacitor C2 with the power supply voltage. This initial charging is generally performed by turning on the switch means, but since ~C2 vibration occurs due to the filter circuit and C2, other switch means are required to prevent this ~C2 vibration phenomenon. JP-A-57-85507 clearly discloses a method in which damping resistors connected in parallel are connected in series to a reactor L, but this method requires a switch means with a large current carrying capacity and is expensive.

In addition, an inverter electric vehicle equipped with an auxiliary charging device that charges the filter capacitor C2 with voltage in order to supply the field current of the induction motor during dynamic braking in the event of a power outage in the overhead lines has been disclosed It is disclosed in Japanese Patent No. 28802. However, there is a problem in that using this auxiliary charging device only during a power outage does not necessarily provide good cost performance, considering its cost and frequency of use.

[Purpose of the invention]

An object of the present invention is to provide a control device suitable for initial charging of a filter capacitor in an inverter electric vehicle.

[Summary of the invention]

A feature of the present invention is that the filter capacitor is initially charged using an auxiliary charging device when the inverter electric vehicle is running or during regenerative braking.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIG. 1st
In the figure, Pt is a pantograph for taking in overhead line voltage, Ll is a switch means for applying overhead line voltage v6 to the load (inverter + induction motor), and H-B is for overcurrent protection when inverter commutation fails. In the high-speed circuit breaker, R1 is an H-B current reducing resistor, L and C2 are a filter reactor and a capacitor.

INV is a three-phase pulse width control inverter with an arm configuration consisting of an anti-parallel connection of a gate turn-off thyristor GT○ and a diode D, which generates variable voltage, variable frequency three-phase alternating current at its output, and generates an induction motor. This is to control the speed of IM.

With such a circuit configuration, conventionally, as shown in FIG. 2, when the switch means L1 is turned on, a damping resistor R for suppressing ~C7 vibration, and a short-circuiting switch means L2 for suppressing vibration.
was set up. Although the damping resistor RI only needs to have a capacity of 1, the short-circuiting switch means L2 requires a current-carrying capacity like the switch means L1, making the device large and expensive.

The present invention relates to an auxiliary charging device Aux shown by a broken line in FIG.

By charging the filter capacitor C2 with a voltage (equivalent to the overhead line voltage V) by Chg and turning on the switch means L after charging the voltage, ~C2 vibration is caused by turning on the switch means L1. This is to suppress the Auxiliary charging equipment Aux, Chg shown by broken lines in Figure 1
are battery voltage E1 and reactor L. , Choppa CH
and thyristor Th.

It consists of When the chopper CH is turned on, current flows through the battery voltage E and the handle L (,).

When the chopper CH is turned off, the current of the reactor L0 flows through the thyristor Th0 to the filter capacitor C7, and the filter capacitor C7 is charged with voltage (
The thyristor Th0 may always be given a gate signal so that it operates as a freewheeling element during the operation of the chopper CH, or the thyristor Th may be replaced with a combination of a freewheeling diode and a direct point switch. good. In this way, the reason why the freewheel element has a switching function is that when a phase short circuit occurs in the inverter,
By repeating this process, the filter capacitor C2 can be charged with the required voltage (equivalent to the overhead wire voltage V8), and after this voltage is charged, the switch means is disconnected. When it is turned on, the overhead line voltage V6 is reduced and the capacitor voltage for the filter is Vc+F, so by turning on the switch means L□, ~C7
No vibration occurs. In addition, the auxiliary charging device Aux, C
hg is not limited to the circuit system shown in FIG.
The DC power source of the auxiliary charging device Aux and Chg is not a battery voltage, but the AC voltage vA0 for the control circuit shown in Fig. 3 is full-wave rectified by diode bridges D1 to D4 via an isolation transformer Tr, and smoothed by a capacitor C. Furthermore, in an inverter electric vehicle that also uses dynamic braking, the auxiliary charging devices Aux and Chg can also be used in the event of an overhead power outage, resulting in an economical effect that does not require new installation.

FIG. 4 is a block diagram showing a specific control example of FIG. 1. First, the logical sum (OR) output of the car command and the braking command (regenerative braking and dynamic braking) is the gate start signal of the chopper CH and thyristor Th, and the voltage pattern (V, a )2 to the switch SW for generating the signal. The overhead line voltage v1 detected by the voltage detector is ANDed with the overhead line voltage patterns v and x.The output is ANDed with the logical sum (OR□) output, and the logical product (AND) is taken. A-ND
, ) outputs are given to delay circuits T and L.

On the other hand, the overhead line voltage va and the overhead line voltage pattern V,'' detected by the voltage detector are given to a high priority circuit composed of diodes D and D2, and its output is the voltage pattern (
VC,) is applied to the generation switch SW. The output of the switch SW is given to a first-order lag circuit consisting of a resistor R and a capacitor C, and the terminal voltage of the capacitor C (V, )
P is the filter capacitor voltage■. 2 voltage pattern. Here, since there is an overhead wire voltage during traveling and regenerative braking, the high priority circuit generates a voltage pattern (VoF) P that is approximately equal to the overhead wire voltage v6. In addition, in dynamic braking during an overhead line power outage, priority is given to the overhead line voltage pattern V CF '', and a voltage pattern (VoP) F that is approximately equal to the overhead line voltage pattern vMx is generated.
, , ) P is also compared with the detected value V Q F of the actual filter capacitor voltage, and according to the deviation ε, the phase shifter APS is driven via an appropriate stabilizing element G, and the chopper CH
and controls thyristor Th0.

As a result, as explained in the circuit of FIG. 1, the voltage of the filter capacitor C2 gradually rises, and is charged to a voltage determined by the voltage pattern (v, l, . . . )P at that time, and the voltage pattern (VayL) Filter capacitor voltage Ver
The deviation ε becomes almost zero. When this deviation ε becomes almost zero, the relay circuit RY produces an output, and the output of the relay circuit RY, together with the outputs of the delay circuits T and L, is a logical product (AN
D, ) is taken, and the switching means L1 of the circuit of FIG. 1 is turned on via the memory circuit ME. This switch means L
1 is confirmed, gate stop of chopper CH and thyristor Th0 is performed.

Note that in the delay circuit RY, the deviation E of the filter capacitor voltage VaF may become zero even at the beginning of the rise of the voltage pattern (V, +,), so the switch means L is turned on at this time. This is to prevent this. When the car command or the braking command disappears, the logical sum (OR) output becomes zero, the memory ME is reset, the switch means L1 is opened, the voltage pattern generation switch SW is also opened, and the voltage pattern (Vat) is generated. Reset p.

The above operation waveforms are shown in FIGS. 5(A) to 5(S).

In addition, in dynamic braking during an overhead line power outage, the overhead line voltage is V.

Since is zero, the logical products (AND, , AND, , AND,) outputs are all zero, the switching means L□ is not turned on, and only the voltage charging to the filter capacitor C is performed.

According to the embodiment of the present invention, the auxiliary charging device applies a voltage (voltage equivalent to the overhead line voltage) to the filter capacitor C2 in advance.
Since it is charged in advance, it is possible to omit the switch means having a large current carrying capacity and to prevent the -C and vibrations when the switch means L1 is turned on.

6 and 7 show other embodiments of the invention.

Connect the auxiliary charging device glue handle L0 to the filter reactor L,
It is also used as FIG. 6 shows an example of application to the circuit of FIG. 1, and FIG. 7 shows an example of application to the circuit of FIG. 3. The specific control block diagrams in the circuits shown in FIGS. 6 and 7 can be applied as shown in FIG. 4.

In the embodiments shown in FIGS. 6 and 7, there is no need to newly install the auxiliary charging device axle L0, and the auxiliary charging device can be made inexpensive.

In addition, in inverter electric vehicles that use dynamic braking during braking, by adopting the present invention, the auxiliary charging device used in the event of a power outage can also be used for power line or regeneration control, making it unnecessary to install a new auxiliary charging device. There is no economic effect.

Furthermore, by using the auxiliary charger accelerator as a filter reactor, the auxiliary charger can be made inexpensive.

〔Effect of the invention〕

According to the present invention, by performing initial charging of a filter capacitor in an inverter electric vehicle using an auxiliary charging device,
Switching means having a large current carrying capacity can be omitted.

[Brief explanation of drawings]

Fig. 1 is a main circuit diagram of an inverter electric vehicle according to an embodiment of the present invention, Fig. 2 is a conventional main circuit diagram, Fig. 3 is a circuit diagram showing an example of a power supply section of an auxiliary charging device, and Fig. Figure 5 is a control block diagram of the circuit, Figure 5 is an explanation diagram of the operation of Figure 4, Figures 6 and 7 are
The figure is a circuit diagram of another embodiment of the present invention. Pt: Pantograph, E: Voltage of auxiliary charging device. L, L2...Switch means, Lo...Supplementary voltage accelerator, H-B...High speed circuit breaker, CH...Chopper of supplementary charging device, C7...Filter reactor,
Thc...Thyristor of auxiliary charging device, C...Filter capacitor, R, damping resistor, INV...Inverter, IM...Induction motor, Aux, Chg...
・Auxiliary charging device.

Claims (1)

[Claims] 1. An inverter electric vehicle comprising a power source, a switch means, a filter circuit including a reactor capacitor, an inverter and an induction motor connected to the filter circuit, comprising: power running of the inverter electric vehicle; A control device for an inverter electric vehicle, characterized in that the capacitor is charged by an auxiliary charging device at the start of braking, and the switch means is turned on after the charging is finished.