JPS60191834A - Current supply changing-over method for ac type electric railway - Google Patents

Abstract

PURPOSE:To improve reliability and safety of running by changing over current supply from each substation with high speed without temporarily stopping the running of electric cars when they travel under the electric car line divided into sections between two adjacent AC substations. CONSTITUTION:An electric car line for supplying current to an electric car 6 traveling along a rail 5 is constituted from first and second electric car lines 1a, 1b to which is applied the output voltage of first and second AC substations 2a, 2b and a third electric car line 1c connected between both electric car lines 1a, 1b through sections 3a, 3b. And the electric car lines 1a, 1c and 1b, 1c are interconnected through an electric path comprising bridge circuits 11a, 11b, a thyrister breakers 14a, 14b. And according to the comparation result of each voltage phase of electric car lines 1a, 1c or 1b, 1c, each of breakers 14a, 14b is controllably turned on and off during traveling of the electric car 6 between the substations 2a, 2b.

Description

[Detailed description of the invention] (Technical field) The present invention relates to a power supply switching method for an AC electric railway.

(Prior Art and Problems) Conventionally, a power supply device for an AC electric railway has been configured with a feeder circuit as shown in FIG. 1, for example. In Figure 1, 1
a is connected to the first AC substation 2a @1 electric train shaft, 1b
is a second overhead contact line connected to the second AC substation 2b.

A third overhead contact line 1c is provided between the first overhead contact line 1a and the second electric JfT line lb via sections 3a and 3b. An AC circuit breaker 4a is connected between the overhead contact line 1a and lc sandwiching the section 3a. An AC circuit breaker 4b is connected between the overhead contact line 1c and lb sandwiching the section 3b.

At a predetermined location on the rail 50 connecting the substations 2a and 2b, the presence of the electric car 6 is detected and the circuit breakers 4a and 4b are activated by υ1]
Ground treadles 7'a, 7b, 7c are provided which supply a closing control signal. The electric car 6 is now moving from the first substation 2a to the second substation
Assume that the vehicle is traveling toward the substation 2b, and the AC circuit breaker 4a is in the open state and the AC circuit breaker 4b is in the open state. next'
- When the electric car advances and steps on the ground treadler 7C, the treadler 7C
A control signal for opening the AC circuit breaker 4a and a control signal 1G for closing the AC circuit breaker 4b are issued.

As a result, the circuit breaker 4a is switched to the open state and the circuit breaker 4b is switched to the closed state during the period when the electric car 6 is under the 3'-th lane IC. Then, since the AC voltage from the second AC substation 2b is applied to the M 3 'Lfj: lane 1c and the second overhead contact line 1b, the potential difference between the calculator lines lc and lb becomes zero. Therefore, no arc occurs in the section 3b where the electric car 6 crosses the section 3b. Next, when the electric car 6 advances toward the second AC substation 2b and steps on the ground step 7b, a control signal is sent from the step 7b to close the AC circuit breaker 4a, and fDIJ to open the AC circuit breaker 4b. A control signal is issued. This allows gF
! The JR switch 4a is switched to a closed state, and the circuit breaker 4b is switched to an open state.

In the device constructed as described above, the AC circuit breaker 4
a. Except for switching the power supply from the two substations using 4bi opening/closing control, due to the mechanism of the section switching device, the power supply will inevitably be interrupted at the third crawl lane IC, which will hinder the operation of electric cars.

That is, if the timing of power supply switching is shifted due to a delay in the operation time of the AC circuit breakers 4a and 4b, the AC interrupter VjT
The power supply is stopped within the time from when the AC circuit breaker 4a is opened to when the AC circuit breaker 4b is closed, and the
tJXh, f-1ulGkmar'Sxa;Tid! ,
)σ), 'If self; stops. and AC breaker 4b
Until the power supply is closed and power supply is restarted, a power converter for driving and controlling the rotating machine, such as a thyristor converter, will fail in commutation and become inoperable. In other words, if the electric motor for driving the electric car 6 is a regenerative electric car that can convert the car power generated during regeneration '+1ilJ operation into externally excited impark and store it in the AC IC system, 1''1 ■As mentioned above, if the power supply switching timing is off and the vehicle/vehicle IC goes into a no-voltage state, the control elements of the separately excited Innopark, such as the thyristor, cannot be commutated, making regenerative quadruple rotation impossible. Tono [ru. Furthermore, it is a good electric car with a separately excited inverter mounted on it. If the period is long, electric cars will stop temporarily and the monetary damage will be very large.

/ (Object of the invention) The present invention has been made in view of the following two points.
Without temporarily stopping the operation of electric cars running under the overhead contact lines, which are divided into sections between AC substations,
It is an object of the present invention to provide a power supply switching method for an AC electric railway that can switch the power supply from the substation at high speed.

(Summary of the Invention) The present invention provides an electric vehicle moving from a first AC substation to a second AC substation when an electric car moves from the first AC substation to the second AC substation. For electric vehicle side drive when moving under the overhead contact line that is divided into sections between the second AC substation and switching between different power sources (the first AC substation and the second AC substation are shown) When the phase difference between the voltage of the overhead contact line generated by the residual voltage of the motor and the feed voltage of the second AC substation falls within a predetermined range, the power supply path connecting the overhead contact line and the second AC substation is closed. The feature is that the power supply is switched in this manner.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings. In FIG. 2, the same parts as in FIG. 1 are denoted by the same reference numerals, and the explanation thereof will be omitted. lla is a first bridge circuit formed by bridge-connecting diodes 128 to 12d. A common connection point 13a between the diode 12a and the diode 12b is connected to the first contact line 1a, and a common connection point 13b between the diode 12C and the diode 12d is connected to the 3' (g lane IC).
a and the diode-woven cathode are connected to the a node of a first semiconductor circuit breaker which is stationary and has a fast disconnection function, for example the first cyrisk circuit breaker 14a. The cathode of this 19th iris breaker 14a is the diode 1
2b and the anode of the diode 12d. llb is a second bridge circuit formed by bridge-connecting diodes 12e to 12h. The common contact point 13c of the diode 12e and the diode 12f is the second contact line 1
connected to diode 12g and diode 1
Common handling of 2b *J point 13d is connected to the third calculator line IC. The anodes of the diode 12e and the diode 12g are connected to a second semiconductor circuit breaker, e.g.
The diode b is connected to the cathode of the diode 12f and the diode 12h. 15
a is the 4th wheel heel connected to the 1st AC substation 2a, 15
b is the fifth overhead contact line connected to its 2 AC substation 2b. There is a d between the first overhead contact line 1a and the fourth electric disarmament line 15a.
↓1 autotransformer i6a is inserted, and this transformer 1
The midpoint of the winding 6a is located at the rail 5 (7kz'c).

Six second autotransformers 16b are inserted between the second contact line 1b and the fifth contact line 15b, and the midpoint of the winding of this transformer 16b is connected to the rail 5.

Said 1st. The second single-street transformers 16a and 16b are transformers for reducing the 1P induction fault J caused by the current flowing in the rail 5 leaking to the ground. At a predetermined location on the rail 5, ground treadles 7a, 7b, and 7c that supply opening/closing control signals in response to the presence of the electric car 6 are swung by <11 as shown in Figure 3. FIG. 3 is an equivalent circuit diagram showing the device in FIG. 2 with one part omitted;

Figure 4 shows the output voltage Ea of the first AC power station 2a and the output voltage Ea of the second AC power station 2a.
It is a voltage waveform diagram of output voltage Eb of AC substation 2b.

Next, a method for switching between different power supplies in the device constructed as described above will be explained with reference to the switching control circuit diagram shown in FIG. Now, the overhead line voltages of the first to third overhead contact lines LA, LB, and LC are detected by the first to third voltage detectors 21a and 21b.

I will keep an eye on everyone at 21c. and the first voltage detector 21
The phase of the output voltage of a and the output of the third voltage detector 21 c'
The phases of the 74 pressures are compared by the ass 1 phase comparator 22a. Further, the phase of the output voltage of the 2'1st pressure detector 21b and the phase of the output voltage of the third voltage detector 21C are compared by the second phase comparator 22b. Here, the electric car 6 is traveling from the first substation 2a to the a) second substation 2b, the first thyristor circuit breaker 14a is in the closed state, and the second thyristor circuit breaker 14 is in the closed state.
Suppose that b is in an open state. At this time, the 3'1α table I
Since the AC voltage Ea from the first AC substation 2a is applied to C, the 4-position difference between the '1 lane 1a and the IC is zero.

Therefore, when the electric car 6 crosses the section 7, the arc does not occur in the section 3a.

Next, when the electric car 6 moves forward and steps on all of the ground pedals 70, the first thyristor noise interrupter 1! A control signal is issued to open step a, and at the same time the fifth step is released from step 7C.
The ON command is sent to the second leg circuit 23b in the figure, and the first judgment circuit 2
A 01" F command is issued to each terminal 3a. This causes the first thyristor SM device 14a to reach the time t shown in FIG.
1, it becomes open state. At this moment, the power supply to the electric car 6 is stopped, but since the electric car 6 is equipped with auxiliary equipment such as a rotating machine, the residual voltage of the auxiliary equipment is increased to 3. Occurs at the tram line IC. At this time, the second determination circuit 23b determines whether the voltage of the 211th lane lb output from the second phase comparator 22b and the voltage of the third contact line IC are
[If the king phase difference θ is within a predetermined range (for example, 30
' to 600) is determined for a predetermined period of time (for example, the time until two cycles have elapsed) from time t1. Then, at time t2 when the voltage phase difference θ is determined to be within the predetermined range, the ON iris breaker 14b is turned on from the second determination circuit 23b to the control circuit 14b' that closes the second thyristor-equipped I1OY device 14b. It turns out.

As a result, -C, electric car 6 running under the third contact line IC
, from the second substation 2b to the second overhead contact line 1b.

Diode 12F, second thyristor breaker 14b.

Power is supplied through the diode 12g and the third contact line IC4-. In this way, the power supply to the electric car 6 running under the third overhead contact line IC can be switched within a very short period of time, for example, within two cycles, when the electric car side drive motor has residual voltage, and moreover, The power supply is switched when the phase difference between the voltage of the overhead contact line 1c (7) (residual voltage ell of the electric car 6) and the voltage of the second overhead contact line 1b (feed voltage Eb of the second substation 2b) is within a predetermined range. As a result, commutation fails in the power converter (not shown) mounted on the electric car 6. The electric car 6 moves from the second substation 2b to the first substation 2.
When the vehicle travels to direction a, the power supply switching operation is similar to that described above, so its explanation will be omitted.

In addition, the voltage phase difference ji when performing the above-mentioned supply T'l switching
The enclosing range is not limited to 30° to 60°, but may be other values.

Furthermore, the power supply switching time is not limited to two cycles, but may be any other value.

(Effects of IJ) As described above, according to the present invention, the following effects can be obtained. In other words, (1) Since the power supply from two adjacent substations is switched at high speed, for example within two cycles of the residual voltage of the drive motor on the electric car side, the electric car can continue to operate without any problems. .

(2) Since the power supply is switched when the phase difference between the substation's feed voltage and the electric car's remaining Wi voltage is within a predetermined range, the power converter mounted on the electric car can maintain stability without commutation failure. It is possible to continue driving the vehicle.

In particular, even if the electric car is a regenerative electric car equipped with a separately excited inverter, commutation failure does not occur in the inverter, so the reliability and security of electric car operation are significantly improved.

(3) When the electric car passes through the entire section, the potential difference between the contact wires sandwiching the section can be reduced to zero, so no arc occurs in the section. Therefore, damage to the section and the pantograph of the electric car due to arc generation can be avoided.

(4) Since the circuit breaker used to switch the power supply is a stationary half-body circuit breaker, it is maintenance-free and the burden of maintenance and inspection is greatly reduced, and there is no noise, so environmental friendliness is not significantly improved. “Ru.

[Brief explanation of drawings]

Figure 1 shows the conventional exchange υ11. Figures 21 to 5 show an embodiment of the present invention, Figure 2 is a circuit diagram, and Figure 3 is a circuit diagram showing the power supply switching method of E-air railway. The equivalent circuit diagram with parts omitted, Fig. 4 is the α pressure waveform diagram, and Fig. 5 is the control LITl 1!:!] jli; diagram.
b=-'9. v'+ is a substation, 3 a, 3 b-Sef V'; 3 n, 5-v -/l/, 6... electric car,
7a, 7b, 7c...earth''-stepper, il;+,llb・
...Bridge circuit, 12a to l2h-diode, 14a, 14b...-Relirisk I/breaker,
14a', 14b'... Control N path, 1 6 21 1
7den h,,,ili,'4 yi-・11:
Tsuyuri 1 li li lk, -. Voltage detector, 22a, 22b...phase comparator, 23a
. 23b...determination circuit.

Claims (1)

[Claims] a first overhead contact line to which the output voltage of the first AC substation is applied;
a second train set to which the output voltage of a second AC substation adjacent to the first AC substation is applied; and a third contact line provided through a section between the first and second contact lines. , a first contact line inserted in the electric line connecting the first contact line and the third contact line.
A semiconductor circuit breaker, a second half-core g breaker inserted in the electrical path connecting the -↓ second overhead contact line and the third overhead contact line, the voltage phase of the first overhead contact line and the voltage of the third turtle line. the first AC substation (or When an electric car moving from the second AC substation (or the first AC substation) moves under the third contact line, the first semiconductor circuit breaker (or the second semiconductor circuit breaker) is turned off, and the phase difference output of the second phase comparison means (or first phase comparison means) is controlled to a predetermined value within a predetermined time after the first semiconductor circuit breaker (or second semiconductor circuit breaker) is turned off. A power supply switching method for an electric railway using an alternating current θ1, characterized in that the second semiconductor circuit breaker (or the first semiconductor circuit breaker) is controlled to be turned on when the current value is reached.