KR100955906B1 - A control system of thyristor valve - Google Patents

Abstract

The present invention relates to a control system for controlling a thyristor valve used in a transmission facility, and more particularly, to a control system for controlling a thyristor valve used in a transmission facility, including: a signal receiving unit (1) for receiving a valve command signal through an optical fiber (OF); A decoder 2 for decoding a signal input from the signal receiving unit 1; An input signal interface section (3) for providing an input signal so that the valve gating logic section generates a control signal; A valve gating logic section (4) for generating a control signal by a signal inputted from the input signal interface section (3); And a system state data output unit 5 according to a signal input from the valve gating logic unit 4 to precisely control the thyristor valve used in the transmission equipment and to precisely transmit signals through the optical fiber and to measure and protect rapidly The thyristor valve can be controlled with high reliability, the thyristor level can be measured with a compact configuration, and the interface immunity can be ensured, which is a useful invention having a particular advantage that the thyristor valve can be controlled with high reliability.

Thyristor valves, transmission equipment, optical fibers, valve signaling.

Description

[0001] The present invention relates to a control system for a thyristor valve,

The present invention relates to a control system for controlling a thyristor valve used in a transmission facility. More particularly, the present invention relates to a control system for controlling a thyristor valve by receiving a valve command signal through an optical fiber, To a control system of a thyristor valve.

Generally, as a system stabilizing device, valves such as a light trigger thyristor, a gate turn off (GTO) thyristor, and an insulated gate bipolar transistor (IGBT) are employed in transmission facilities including high voltage and high power fields. In particular, there is a possibility that stable operation can not be maintained due to the aging of the thyristor valve or the analog control protection device in the domestic market, so that the switch to the latest air-insulated water-cooled light trigger thyristor valve is being made.

On the other hand, electricity liberalization has been expanding in Japan recently, and since April 2005, it has been replaced by 6,000V, allowing electric power companies to freely choose electric power companies in demand households with 50kW or more.

When electricity is liberalized, electricity trading using DC transmission facilities is also achieved. However, the Bondy DC transmission facility is designed to assume a linkage in a large electric power because the functions in the backup level are very strong in case of an emergency, resulting in various problems.

When the DC current is lowered due to the pulsation of pulsating current in the direct current, the switching current of the thyristor valve is controlled by pulsating current. The intermittent operation of this current increases the probability of failure of the thyristor element, so that it does not become below the minimum operation power so that the direct current can not be lower than a predetermined value.

Accordingly, it is urgently required to develop a diagnostic technique capable of determining the deterioration phenomenon of the thyristor valve.

SUMMARY OF THE INVENTION In view of the above-described circumstances, the present invention provides a thyristor valve

And it is an object of the present invention to provide a control system for accurately controlling the apparatus.

Another object of the present invention is to provide a control system for a thyristor valve that controls the thyristor valve with high reliability with accurate signal transmission and rapid measurement and protection functions through an optical fiber.

It is still another object of the present invention to provide a thyristor valve control system capable of measuring the thyristor level with a compact structure and securing the interface immunity, thereby controlling the thyristor valve with high reliability.

A control system for a thyristor valve according to the present invention comprises: a signal receiving unit (1) for receiving a valve ignition signal through an optical fiber (OF); A decoder 2 for decoding a signal input from the signal receiving unit 1; An input signal interface section (3) for providing an input signal so that the valve gating logic section generates a control signal; A valve gating logic section (4) for generating a control signal by a signal inputted from the input signal interface section (3); And a system state data output section (5) by a signal input from the valve gating logic section (4).

The present invention accurately controls the thyristor valve used in transmission facilities, controls the thyristor valve with high reliability by precise signal transmission and rapid measurement and protection function through the optical fiber, enables the thyristor level measurement with a compact configuration, There is a special advantage that the thyristor valve can be controlled with high reliability.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a preferred embodiment of a thyristor valve control system according to the present invention will be described in detail with reference to the accompanying drawings.

Fig. 3 is a waveform diagram of the input / output signal of each part shown in Fig. 2, Fig. 4 is a graph showing the relationship between the temperature Tj of the junction portion and the temperature of the junction portion of the thyristor valve. 5A and 5B are graphs showing changes in the dV / dt threshold value with time, FIGS. 6A and 6B are graphs showing changes in the final dV / dt threshold value Tj according to the temperature Tj of the junction, FIG. 7 is a graph showing the anode voltage change of the thyristor according to the voltage change (dV / dt) of the breakover diode (BOD), FIG. 8 is a graph showing the anode voltage change of the thyristor according to the junction temperature Tj 1 is a block diagram of a control system for a thyristor valve according to the present invention. The control system for a thyristor valve according to the present invention comprises: a signal receiver 1 for receiving a valve ignition signal via an optical fiber OF; A decoder 2 for decoding a signal input from the signal receiving unit 1; An input signal interface section (3) for providing an input signal so that the valve gating logic section generates a control signal; A valve gating logic section (4) for generating a control signal by a signal inputted from the input signal interface section (3); And a system state data output section 5 in response to a signal input from the valve gating logic section 4. [

The input signal interface section 3 is connected to the decoder 2 and the valve gating logic section 4 to provide first to seventh voltage comparators 10 to 16 for providing an input signal to the valve gating logic section to generate control signals. )).

The valve gating logic section 4 is connected to the decoder 2 and the input signal interface section 3 to generate and output a gate current GC for controlling the valve gating logic section 4, ; An SR flip flop 30; A state conversion unit 40; A data back encoder 50; A first pulse generator 60; A second pulse generator 70; A pulse generator 80; ORGates (OR1-OR4); And AND gates AND11 to AND3.

The system status data output unit 5 includes a signal receiving unit 51 and an optical fiber OF.

Next, the operation of the control system of the thyristor valve of the present invention constructed as described above will be described.

The start signal ST or the end signal SP at the end is applied to the gate OR1 in the valve gating logic section 4 as shown in Fig. When the start signal ST is applied to the OR gate OR1, the SR flip flop 30 in the valve gating logic section 4 is set and the voltage Va applied to the input signal interface section 3 is 60V , It is turned on and is reset after the recovery time tq determined by the timer 20 shown in Fig.

The recovery time tq is increased according to the temperature Tj of the junction and the recovery time tq is reset by resetting the SR flip flop 30 by the timer 20 .

Here, the dV / dt threshold value is controlled according to the temperature Tj of the junction as shown in FIGS. 5A and 5B in accordance with the operation state so as to block the thyristors Q1 and Q2 shown in FIG. 6A and the voltage Va across the anode of the thyristors Q1 and Q2 is shown in FIG. 7 according to the voltage change dV / dt of the breakover diode BOD As shown in FIG.

When a forward overvoltage of the breakdown diode BOD shown in FIG. 1 is applied, a signal that turns on the valve turn-on and break-over diode BOD in the breakdown diode BOD itself is transmitted to the gates of the thyristors Q1 and Q2. The voltage Va across the anode of the transistors Q1 and Q2 varies as shown in Figure 8 depending on the temperature Tj of the junction and the SR flip flop 30 is turned on when the reverse overvoltage of the break- And the blocking ability recovery time is secured.

When the sudden voltage is applied to the thyristors Q1 and Q2 shown in FIG. 1 to exceed the capacitances of the damping resistors R1 and R2, the varistor MOV operates during the swing in the negative direction, ) When swinging in the DML direction, when the peak voltage exceeds a certain range, the thyristors Q1 and Q2 are turned on.

Here, the damping resistors R1 and R2 function to clamp the peak voltage when the consumable capacity (about several hundreds W) is exceeded.

In this manner, the thyristor valve is controlled by receiving the junction temperature Tj information from the thyristor valve via the optical fiber OF and adjusting the blocking capacity recovery time tq and the dV / dt threshold value.

While the present invention has been described with reference to the preferred embodiments, it is to be understood that the invention is not limited thereto and that various changes and modifications may be made therein without departing from the scope of the invention.

1 is a circuit diagram of a thyristor valve,

2 is a configuration diagram of a control system of a thyristor valve of the present invention,

3 is an input / output signal waveform of each part shown in FIG. 2,

Fig. 4 is a diagram showing the relationship of the recovery time tq of the timer to the temperature Tj of the junction,

5A and 5B are graphs showing changes in the dV / dt threshold value with time,

6A and 6B are graphs showing changes in the final dV / dt threshold value depending on the temperature Tj of the junction,

FIG. 7 is a graph showing the anode voltage change of the thyristor according to the voltage change (dV / dt) of the breakover diode (BOD)

8 is a graph showing the change in the anode voltage of the thyristor according to the temperature Tj of the junction.

Description of the Related Art

1: Signal receiving unit 2: Decoder

3: Input signal interface part 4: Valve gating logic part

5: System status data output section

10 to 16: first to seventh voltage comparator 20: timer

30: SR flip-flop 40:

50: data back encoder 51: signal receiving section

60: first pulse generator 70: second pulse generator

80: Pulse generator OR1 ~ OR3: O gate

AND1 to AND3: AND gate OF: Optical fiber

ST: Start signal SP: End call

OP: Optical focusing pulse LH: Reset signal

GC: Gate current TC: Thyristor current

TV: Thyristor voltage tq: Recovery time

Tj: Temperature of the junction Q1, Q2: Thyristor

BOD: Breakover Diode MOV: Varistor

R1, R2: attenuation resistance

Claims (4)

A signal receiving unit (1) for receiving a valve command signal through an optical fiber (OF); A decoder 2 for decoding a signal input from the signal receiving unit 1; An input signal interface section (3) for providing an input signal so that the valve gating logic section generates a control signal; A valve gating logic section (4) for generating a control signal by a signal inputted from the input signal interface section (3); And a system state data output section (5) by a signal input from the valve gating logic section (4). 2. The apparatus of claim 1, wherein the input signal interface (3) is connected to the decoder (2) and the valve gating logic (4) to provide first to seventh Voltage comparators (10 to 16)). 2. The system of claim 1, wherein the valve gating logic portion (4) is connected to the decoder (2) and the input signal interface portion (3) to generate a gate current (GC) controlling the valve gating logic portion A timer (20); An SR flip flop 30; A state conversion unit 40; A data back encoder 50; A first pulse generator 60; A second pulse generator 70; A pulse generator 80; ORGates (OR1-OR4); And AND gates (AND1 to AND3). 2. The control system of a thyristor valve according to claim 1, wherein the system state data output section (5) comprises a signal receiving section (51) and an optical fiber (OF).

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