JPH05122806A - Controller for converter - Google Patents

Abstract

PURPOSE:To provide a controller for a converter which drives a linear synchro nous motor (LSM) for levitation railroad, in which influence of voltage drop due to the impedance of feeder line can be eliminated by correcting the voltage drop due to load impedance of a length of feeder line according to the vehicle position. CONSTITUTION:When a vehicle position detector 12 detects a vehicle in a section where a converter 4-A is operated, a current pattern generator 11 delivers a current pattern signal for driving an LSM to a voltage reference calculating circuit 10. On the other hand, sectional position of vehicle is inputted to a load factor operating circuit 14 which then delivers load factor data to an adder 15 in order to determine the output voltage of the converter 4-A. A gate control circuit 13 generates gate pulses for feeding AC current to a feeder line 5-A and a ground coil 6-1. Since voltage drop due to lengthening of feeder line is corrected by means of a correction coefficient operating circuit 14 and the adder 15, an appropriate AC voltage can be applied at all times.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device for a converter used as a power source for a drive device of a linear synchronous motor for a levitation railway (hereinafter simply referred to as LSM).

[0002]

2. Description of the Related Art FIG. 2 shows a structure of an LSM and a converter. In FIG. 2, 1 is an AC bus bar, 2-A and 2-B are transformers for converting an AC voltage into a predetermined voltage, 2 is a cutoff provided on the input side of the transformer 2-A and the transformer 2-B. , 4-A is a converter for converting the AC power of the transformer 2-A into AC of the required frequency, and 4-B is a converter for converting the AC power of the transformer 2-B into AC of the required frequency, 5-A is a feeder connected to the converter 4-A, 5-B is a converter 4-B
Feeder to be connected with, 6 is one LSM that is composed of n sections (n is an integer of 1 or more), and 7 is n
A section switch connected to the LSM of the section (n is an integer of 1 or more), and 8 is a vehicle running on the LSM 6.

In such a device, converter 4-A powers a section of LSM 6 of 2n + 1 (n is an integer greater than or equal to 2) and converter 4-B has LSM 6 of 2n (n is an integer greater than or equal to 1). Power the section. Now, when the vehicle is in the n section, the section switch SWn is turned on, and the converter 4-A feeds power to the feeder line 5-A and feeds the LSM of the n section. Next, when the vehicle enters the n + 1 section, the section switch SWn + 1 is turned on, and the converter 4-B gradually feeds the feeder wire 5-B to feed the LSM of the n + 1 section. On the other hand, the converter 4-A feeding the n-section gradually lowers the output, makes the output zero after a predetermined time, turns off the section switch SWn, and stops the feeding to the n-section. Further, when the vehicle enters the n + 2 section, the section switch SWn + 2 is turned on, and the converter 4-A gradually feeds power to the feeder wire 5-A, and the LSM of the n + 2 section is supplied.
Power. On the other hand, the converter 4-B feeding the n + 1 section gradually lowers the output, makes the output zero after a predetermined time, and turns off the section switch SWn + 1.
Stop powering the +1 section. By alternately operating the converter 4-A and the converter 4-B in this manner, the LS
Drive M. This method will be further described with reference to FIG. FIG. 3 shows the converter 4-A of FIG. 2 in focus, and the same parts as those of FIG. 2 are designated by the same reference numerals.

6-1 is a fixed ground coil in one section of the LSM6. 9U, 9V and 9W are current detectors that detect the output AC current of the converter 4-A, 10 is a voltage reference calculator, 11 is a current pattern generator, and 12 is a vehicle position detector that detects the position of the vehicle. , 13 are converters 4-A
Is a gate control circuit for controlling the gate of the.

Now, the vehicle position detector 12 causes the converter 4
-When the vehicle 8 is in the section for driving A, the current pattern generator 11 operates and inputs the current pattern signal necessary for driving the LSM 6 to the voltage reference calculation circuit 10,
The voltage reference calculation circuit 10 performs a logical operation from the current pattern signal and the output AC current of the converter 4-A detected by the current detectors 9U, 9V, 9W to obtain a converter 4-A.
Calculates a voltage reference that determines the output voltage of the converter, inputs the voltage reference signal to the gate control circuit 13, and the gate control circuit 13 generates a gate pulse to form the main circuit of the converter 4-A. By changing the energization period of the semiconductor element and applying an AC voltage to the load, the power supply cable 5-A and ground coil 6-
Apply alternating current to 1.

[0006]

In the above-mentioned device,
The impedances ZCU, ZCV, ZCW of the ground coil 6-1 are constant, but the impedances ZeU, Z of the feeder line 5-A.
Since eV and ZeW increase as the feeder line 5-A becomes longer, a corresponding voltage drop occurs. Therefore, the converter 4
-A problem that the appropriate AC voltage is not applied to the load only by the output AC current and the current pattern signal input to the voltage reference calculation circuit 10 when A starts the operation, and the current flowing through the load is also not appropriate. was there.

An object of the present invention is to provide a converter control device capable of always applying an appropriate AC voltage to a load and allowing an appropriate current to flow to the load even if the length of the feeder is increased. It is in.

[0008]

In order to achieve the above object, the present invention is provided with a load coefficient calculation circuit capable of storing the magnitude of impedance with respect to the length of a feeder as data. It is characterized in that an adder is provided for adding a signal and an output signal of the load coefficient calculation circuit and outputting an appropriate voltage reference signal to the gate control circuit.

[0009]

With the above-described structure, even if the length of the feeder is increased, the load factor calculation circuit that stores the magnitude of the impedance with respect to the length of the feeder as data from the vehicle position is calculated. It is possible to calculate the magnitude of the voltage drop that changes depending on the voltage, and to correct the shortage based on the voltage reference, so that an appropriate AC voltage can always be applied to the load, and an appropriate AC current can be applied to the power grid or the ground coil. ..

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG. 1 in which the same parts as those in FIG.

In FIG. 1, reference numeral 14 indicates in advance the magnitude of the impedances ZeU, ZeV, ZeW with respect to the length of the feeder.
A load coefficient calculation circuit that can be stored as a data, and 15 adds a voltage reference signal which is an output of the voltage reference calculation circuit 10 and an output signal of the load coefficient calculation circuit 14 to obtain a gate control circuit 13
Is an adder that outputs an appropriate voltage reference signal to the.

Now, the vehicle position detector 12 causes the converter 4
-When the vehicle 8 is in the section for driving A, the current pattern generator 11 operates and inputs the current pattern signal necessary for driving the LSM 6 to the voltage reference calculation circuit 10,
On the other hand, the section position given by the vehicle position detector 12 is input to the load coefficient calculation circuit 14, the load coefficient data is output as an output signal, and the voltage reference calculation circuit 10 detects the current pattern signal and the current. The signals calculated by the logical operation from the output currents of the converters detected by the converters 9U, 9V, 9W and the signal output from the load coefficient calculation circuit 14 are input to the adder 15 to output the output voltage of the converter 4-A. The voltage reference to be determined is calculated, and the signal output from the adder 15 is input to the gate control circuit 13, and the gate control circuit 13 generates a gate pulse to form the main circuit of the converter 4-A. By changing the energization period of the semiconductor element to apply the AC voltage to the load, the power supply line 5-A and the ground coil 6-1 that are the load are applied.
Apply an alternating current to.

With respect to the voltage drop that occurs when the feeder line becomes long, the load factor calculation circuit 14 calculates the amount of voltage drop.
Since it is calculated in step S1 and added by the adder 15, an appropriate AC voltage can always be applied. The above operation will be further described with reference to FIG. 4. Reference numeral 16 is a substation in which equipment such as a converter is installed.

For example, when the LSM 6 is composed of 10 sections and power is supplied from the substation 16 at an intermediate point,
The farthest from the substation 16, the 1st section and the 10th section have the largest impedance of the electric wire, and the 5th section and the 6th section closest to the substation 16 have the smallest impedance.

Therefore, when the vehicle starts from the first section, the magnitude output from the load coefficient calculation circuit 14 is the largest, and as the vehicle approaches the substation 16, the magnitude output from the load coefficient calculation circuit 14 is larger. Substation 1
As the vehicle 8 passes through 6 and moves further away from the substation 16, the magnitude output from the load coefficient calculation circuit 14 increases, and the load coefficient data becomes maximum in the 10th section.
Data A is added to the adder 15.

[0016]

As described above, according to the present invention, a load coefficient calculation circuit capable of storing the magnitude of the impedance with respect to the length of the feeder as data, further a voltage reference signal and the load coefficient. By adding an adder that adds the output signal of the arithmetic circuit and outputs it as an appropriate voltage reference signal to the gate control circuit, the voltage against the voltage drop that occurs when the length of the feeder is increased. Since the amount of decrease is calculated by the load coefficient calculation circuit and added by the adder, an appropriate AC voltage can always be applied to the load, and a highly accurate converter control device can be provided.

[Brief description of drawings]

FIG. 1 is a block diagram of a converter control apparatus according to an embodiment of the present invention.

FIG. 2 is a layout view of a floating synchronous linear synchronous motor and a converter.

FIG. 3 is a block diagram of a conventional converter control device.

FIG. 4 is a diagram showing the relationship between vehicle position and load coefficient data for explaining the present invention.

[Explanation of symbols]

1… AC bus 2
… Circuit breakers 3-A, 3-B… Transformers 4-A, 4-B
… Transformers 5-A, 5-B… Feeder 6
… LSM 6-1… Ground coil 7
… Section switch 8… Vehicle 9U, 9V, 9
W ... Current detector 10 ... Voltage reference calculation circuit 11
… Current pattern generator 12… Vehicle position detector 13
… Gate control circuit 15… Adder 16
…substation

Claims (1)

[Claims] 1. A control device for a converter for driving a linear synchronous motor for a levitation railway, comprising a vehicle position detector, wherein the length of a feeder line fed by the converter is long and the load impedance is the vehicle position. A control device for a converter, comprising: a load coefficient calculation means for correcting the voltage drop due to the load impedance according to the vehicle position even if it changes depending on the vehicle position detected by the detector.