KR20150124329A

KR20150124329A - Hvdc converter and controlling method thereof

Info

Publication number: KR20150124329A
Application number: KR1020140051099A
Authority: KR
Inventors: 이진희; 백승택; 이욱화; 정용호
Original assignee: 엘에스산전 주식회사
Priority date: 2014-04-28
Filing date: 2014-04-28
Publication date: 2015-11-05

Abstract

The converter device according to the embodiment of the present invention receives an overall command value for controlling the power conversion operation of the converter device from an upper controller of the HVDC system and controls the operation of each of the plurality of submodules based on the received total command value An intermediate controller for receiving a control signal generated from the valve controller and for transmitting the received control signal to each of the plurality of submodules, and a controller for receiving the control signal from the intermediate controller, And a submodule for generating an output voltage based on the received control signal.

Description

Technical Field [0001] The present invention relates to a converter device of a HVDC system and a control method thereof.

The present invention relates to a converter device of a HVDC system and a control method thereof, and more particularly, to a converter device of a HVDC system capable of efficiently controlling a plurality of sub-modules of a HVDC system and a control method thereof.

HIGH VOLTAGE DIRECT CURRENT (HVDC) refers to a transmission system in which a transmission station transforms AC power generated by a power plant into DC power and supplies power by re-converting it from AC to AC.

The HVDC system is applied to submarine cable transmission, large-capacity long-distance transmission, and linkage between AC systems.

In addition, the HVDC system enables different frequency grid linkage and asynchronism linkage.

Transformers convert AC power to DC power. In other words, it is very dangerous to transmit AC power using a submarine cable. Therefore, the power station converts the AC power into DC power and transmits it to the power plant.

On the other hand, the HVDC system includes a plurality of sub-modules to convert AC power to DC power.

These submodules consist of power semiconductors, and power semiconductors include thyristors and insulated gate bipolar transistors (IGBTs).

In the HVDC system, since a plurality of submodules are used to convert AC power to DC power, efficient control of a plurality of submodules is most important in power conversion operation.

However, in the HVDC system, one controller processes the operation of a plurality of submodules, so that the control operation of the controller may be slowed down by collecting status information of a plurality of submodules and controlling each submodule.

Also, when a plurality of sub-modules are processed by one controller, there is a problem that the response may be delayed when a quick response operation is required depending on the state of the sub-module.

Accordingly, a converter device capable of efficiently controlling a plurality of submodules in a HVDC system is required.

An object of the present invention is to provide a converter device of an HVDC system capable of efficiently controlling a plurality of sub-modules included in a converter device of an HVDC system and a control method thereof.

The converter device according to the embodiment of the present invention receives an overall command value for controlling the power conversion operation of the converter device from an upper controller of the HVDC system and controls the operation of each of the plurality of submodules based on the received total command value An intermediate controller for receiving a control signal generated from the valve controller and for transmitting the received control signal to each of the plurality of submodules, and a controller for receiving the control signal from the intermediate controller, And a submodule that generates an output voltage based on the received control signal.

The intermediate controller of the converter device according to the embodiment of the present invention receives the submodule status signal transmitted by each of the plurality of submodules, determines whether the submodule is abnormal based on the received submodule status signal, As a result, if at least one of the plurality of sub-modules is abnormal, it is possible to transmit the protection operation signal to the sub-module determined to be abnormal.

The submodule status signal of the converter device according to an embodiment of the present invention may be a signal including information on at least one of voltage, current, temperature, and physical cracking of the submodule.

The intermediate controller of the converter device according to an embodiment of the present invention compares at least one of voltage, current, temperature, and physical cracking of the submodule included in the submodule status signal with a reference value to determine whether the submodule is abnormal Can be determined.

The valve controller of the converter device according to the embodiment of the present invention includes a first sensor part for measuring at least one of a voltage and a current of a system connected to the converter device and a second sensor part for generating the control signal based on the total command value And a first communication unit for transmitting the generated control signal to the intermediate controller.

The intermediate controller of the converter device according to an embodiment of the present invention includes a second sensor unit for detecting at least one of physical cracks and temperature of the intermediate controller, and a transmission unit for transmitting the control signal to each of the plurality of submodules And a second communication unit for transmitting the control signal to each of the plurality of submodules.

The intermediate controller of the converter device according to an embodiment of the present invention further includes an interface unit connected to an external device to transmit and receive data and transmits status information of the sub-module connected to the intermediate controller to the external device, The status information of the sub-module connected to the intermediate controller can be displayed.

The intermediate controller of the converter device according to the embodiment of the present invention further includes an interface unit connected to the external device to transmit and receive data, receives a software upgrade file for the submodule from the external device, To the connected submodule.

The submodule of the converter device according to an embodiment of the present invention includes a submodule sensor for detecting at least one of current, voltage, temperature, and physical cracks of the submodule, and a submodule sensor for detecting the output voltage A switching unit for switching a current input to and output from the submodule through the control of the submodule control unit and a storage unit for storing energy according to the switching operation of the switching unit, .

According to various embodiments of the present invention, efficiency of power conversion can be improved by efficiently controlling a plurality of submodules included in the converter device of the HVDC system.

Further, the converter device of the present invention can quickly perform a protection operation according to a change in state of a plurality of connected sub-modules, and thus can protect the HVDC system in response to emergency situations.

1 is a diagram for explaining a configuration of a high voltage direct current transmission (HVDC transmission) system according to an embodiment of the present invention.
2 is a diagram for explaining a configuration of a mono polar high voltage DC transmission system according to an embodiment of the present invention.
3 is a diagram for explaining a configuration of a high-voltage DC transmission system of a bipolar system according to an embodiment of the present invention.
4 is a view for explaining connection of a transformer and a three-phase valve bridge according to an embodiment of the present invention.
5 is a block diagram of the configuration of a converter device according to an embodiment of the present invention.
FIG. 6 shows a connection of a plurality of submodules according to an embodiment of the present invention.
7 is an exemplary view of a sub-module configuration according to an embodiment of the present invention.
8 shows an equivalent model of a submodule according to an embodiment of the present invention.
9 through 12 illustrate the operation of a sub-module according to an embodiment of the present invention.
13 is a first exemplary view showing signal line connection of each configuration of the converter device according to the embodiment of the present invention.
FIG. 14 is a second exemplary view showing connection of signal lines in each configuration of the converter device according to the embodiment of the present invention. FIG.
15 is a third exemplary view showing signal line connection in each configuration of the converter device according to the embodiment of the present invention.
16 is a flowchart showing the operation of the converter device according to the embodiment of the present invention.
17 is a graph of output AC power of the converter device according to an embodiment of the present invention.
18 is a flowchart showing a protection operation of the converter device according to an embodiment of the present invention.
19 is a conceptual diagram showing a monitoring operation of the converter device according to the embodiment of the present invention.
20 is a conceptual diagram showing a software upgrade operation of the converter device according to an embodiment of the present invention.

Hereinafter, embodiments related to the present invention will be described in detail with reference to the drawings. The suffix "module" and " part "for the components used in the following description are given or mixed in consideration of ease of specification, and do not have their own meaning or role.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention and the manner of achieving them will become apparent with reference to the embodiments described in detail below with reference to the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the invention to those skilled in the art. Is provided to fully convey the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims. Like reference numerals refer to like elements throughout the specification.

In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. The following terms are defined in consideration of the functions in the embodiments of the present invention, which may vary depending on the intention of the user, the intention or the custom of the operator. Therefore, the definition should be based on the contents throughout this specification.

Combinations of the steps of each block and flowchart in the accompanying drawings may be performed by computer program instructions. These computer program instructions may be embedded in a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus so that the instructions, which may be executed by a processor of a computer or other programmable data processing apparatus, Thereby creating means for performing the functions described in the step. These computer program instructions may also be stored in a computer usable or computer readable memory capable of directing a computer or other programmable data processing apparatus to implement the functionality in a particular manner so that the computer usable or computer readable memory It is also possible to produce manufacturing items that contain instruction means that perform the functions described in each block or flowchart illustration in each step of the drawings. Computer program instructions may also be stored on a computer or other programmable data processing equipment so that a series of operating steps may be performed on a computer or other programmable data processing equipment to create a computer- It is also possible for the instructions to perform the processing equipment to provide steps for executing the functions described in each block and flowchart of the drawings.

Also, each block or each step may represent a module, segment, or portion of code that includes one or more executable instructions for executing the specified logical function (s). It should also be noted that in some alternative embodiments, the functions mentioned in the blocks or steps may occur out of order. For example, two blocks or steps shown in succession may in fact be performed substantially concurrently, or the blocks or steps may sometimes be performed in reverse order according to the corresponding function.

FIG. 1 shows a high voltage direct current transmission (HVDC transmission) system according to an embodiment of the present invention.

1, the HVDC system 100 according to the embodiment of the present invention includes a power generation part 101, a power transmission side AC part 110, a power transmission side part 103, a DC transmission part 140, A demand side transformation part 105, a demand side AC part 170, a demand part 180, and a control part 190. The transmission-side transformer part 103 includes a transmission-side transformer part 120 and a transmission-side AC-DC converter part 130. The demand side transformation part 105 includes the demand side DC-AC converter part 150 and the demand side transformer part 160.

The power generation part 101 generates three-phase AC power. The power generation part 101 may include a plurality of power plants.

The transmission side AC part 110 transfers the three-phase AC power generated by the power generation part 101 to the DC substation including the transmission side transformer part 120 and the transmission side AC-DC converter part 130.

The transmission side transformer part 120 isolates the transmission side AC part 110 from the transmission side AC-DC converter part 130 and the DC transmission part 140.

The transmission AC-DC converter part 130 converts the three-phase AC power corresponding to the output of the transmission side transformer part 120 into DC power.

The DC transmission part 140 transmits the DC power of the transmission side to the demand side.

The demand side DC-AC converter part 150 converts the DC power delivered by the DC transmission part 140 into three-phase AC power.

The demand side transformer part (160) isolates the demand side AC part (170) from the demand side DC - AC converter part (150) and the DC transmission part (140).

The demand side AC part 170 provides the demand part 180 with the three-phase AC power corresponding to the output of the demand side transformer part 160.

The control part 190 includes a power generation part 101, a power transmission side AC part 110, a power transmission side power part 103, a DC transmission part 140, a demand side transformation part 105, a demand side AC part 170, The demand part 180, the control part 190, the transmission side AC-DC converter part 130, and the demand side DC-AC converter part 150. [ Particularly, the control part 190 can control the timing of the turn-on and turn-off of the plurality of valves in the transmission side AC-DC converter part 130 and the demand side DC-AC converter part 150. At this time, the valve may correspond to a thyristor or an insulated gate bipolar transistor (IGBT).

In addition, the control part 190 may include a valve controller 250 that controls the above-described plurality of valves.

2 shows a mono polar high voltage DC transmission system according to an embodiment of the present invention.

In particular, Figure 2 shows a system for transmitting a single pole DC power. In the following description, it is assumed that a single pole is a positive pole, but the present invention is not limited thereto.

The power transmission side AC part 110 includes an AC transmission line 111 and an AC filter 113.

The AC transmission line 111 transfers the three-phase AC power generated by the power generation part 101 to the power transmission side transformation part 103.

The AC filter 113 removes the remaining frequency components other than the frequency component used by the transmission part 103 from the transmitted three-phase AC power.

The transmission side transformer part 120 includes one or more transformers 121 for the positive polarity. The transmission AC-DC converter part 130 for the positive pole includes an AC-to-bipolar DC converter 131 for generating bipolar DC power, which is connected to one or more transformers 121 And corresponding one or more three-phase valve bridges 131a.

When one three-phase valve bridge 131a is used, the ac-to-bipolar DC converter 131 can generate bipolar DC power having six pulses using alternating current power. At this time, the primary coil and the secondary coil of the one transformer 121 may have a Y-Y-shaped connection and may have a Y-delta (?) -Shaped connection.

When two three-phase valve bridges 131a are used, the ac-to-bipolar DC converter 131 can generate bipolar DC power having twelve pulses using alternating current power. At this time, the primary coil and the secondary coil of one of the two transformers 121 may have a YY-shaped connection, and the primary coil and the secondary coil of the other transformer 121 may have a Y- It may have a connection.

When three three-phase valve bridges 131a are used, the ac-to-bipolar DC converter 131 can generate bipolar DC power having 18 pulses using alternating current power. The greater the number of positive pole DC power pulses, the lower the price of the filter.

The DC transmission part 140 includes a transmission side anode direct current filter 141, a cathode direct current transmission line 143, and a demand side anode direct current filter 145.

The transmission-side anode direct current filter 141 includes an inductor L 1 and a capacitor C 1 and DC-filters the anode direct current power output from the AC-anode DC converter 131.

The bipolar DC transmission line 143 has one DC line for transmission of the bipolar DC power, and the bipolar DC transmission line 143 can be used as a return path of current. One or more switches may be placed on this DC line.

The demand side anode direct current filter 145 includes an inductor L2 and a capacitor C2 and DC filters the anode direct current power transmitted through the anode direct current transmission line 143. [

The demand side dc-ac converter part 150 includes a bipolar dc-ac converter 151 and the bipolar dc-ac converter 151 includes one or more three-phase valve bridges 151a.

The demand side transformer part 160 includes one or more transformers 161 each corresponding to one or more three-phase valve bridges 151a for the anode.

When one three-phase valve bridge 151a is used, the bipolar DC-to-AC converter 151 can generate AC power having six pulses using bipolar DC power. At this time, the primary coil and the secondary coil of the transformer 161 may have a Y-Y connection or a Y-delta connection.

When two three-phase valve bridges 151a are used, the bipolar DC-to-AC converter 151 can generate AC power having 12 pulses using bipolar DC power. At this time, the primary coil and the secondary coil of one of the two transformers 161 may have a YY-shaped connection, and the primary coil and the secondary coil of the other transformer 161 may have a Y- It may have a connection.

When three three-phase valve bridges 151a are used, the bipolar DC-to-AC converter 151 can generate AC power having 18 pulses using bipolar DC power. The greater the number of pulses of AC power, the lower the price of the filter.

The demand side AC part 170 includes an AC filter 171 and an AC transmission line 173.

The AC filter 171 removes the remaining frequency components other than the frequency component (for example, 60 Hz) used by the demand part 180 from the AC power generated by the demand side transmission part 105.

The AC transmission line 173 delivers the filtered AC power to the demand part 180.

3 shows a bipolar high voltage DC transmission system according to an embodiment of the present invention.

In particular, Figure 3 shows a system for transmitting two pole DC power. In the following description, it is assumed that the two poles are a positive pole and a negative pole, but the present invention is not limited thereto.

The transmission side transformer part 120 includes at least one transformer 121 for the anode and at least one transformer 122 for the cathode. The transmission AC-DC converter part 130 includes an AC-positive DC converter 131 for generating positive DC power and an AC-negative DC converter 132 for generating negative DC power. An AC-to-DC converter 131 includes one or more three-phase valve bridges 131a each corresponding to one or more transformers 121 for an anode and the ac-to-cathode DC converter 132 corresponds to one or more transformers 122 for a cathode, respectively One or more three-phase valve bridges 132a.

When one three-phase valve bridge 131a is used for the anode, the ac-to-bipolar DC converter 131 can generate bipolar DC power having six pulses using alternating current power. At this time, the primary coil and the secondary coil of the one transformer 121 may have a Y-Y-shaped connection and may have a Y-delta (?) -Shaped connection.

When two three-phase valve bridges 131a are used for the positive pole, the ac-to-bipolar DC converter 131 can generate bipolar DC power with twelve pulses using alternating current power. At this time, the primary coil and the secondary coil of one of the two transformers 121 may have a YY-shaped connection, and the primary coil and the secondary coil of the other transformer 121 may have a Y- It may have a connection.

When three three-phase valve bridges 131a are used for the anode, the ac-to-bipolar DC converter 131 can generate bipolar DC power having 18 pulses using alternating current power. The greater the number of positive pole DC power pulses, the lower the price of the filter.

If one three-phase valve bridge 132a is used for the cathode, the ac-to-cathode DC converter 132 can produce negative DC power with six pulses. At this time, the primary coil and the secondary coil of the one transformer 122 may have a Y-Y-shaped connection and may have a Y-delta (?) -Shaped connection.

When two three-phase valve bridges 132a are used for the cathode, the AC-to-negative DC converter 132 is capable of generating negative DC power having twelve pulses. At this time, the primary coil and the secondary coil of one of the two transformers 122 may have a YY-shaped connection, and the primary coil and the secondary coil of the other transformer 122 may have a Y- It may have a connection.

When three three-phase valve bridges 132a are used for the cathode, the AC-to-negative DC converter 132 can generate negative DC power with eighteen pulses. The greater the number of negative DC power pulses, the lower the price of the filter.

The DC transmission part 140 includes a transmission side anode direct current filter 141, a transmission side cathode direct current filter 142, a cathode direct current transmission line 143, a cathode direct current transmission line 144, a demand side anode direct current filter 145, And a demand side cathode direct current filter 146.

The power supply side cathode direct current filter 142 includes an inductor L3 and a capacitor C3 and DC-filters the cathode direct current power output from the AC-negative DC converter 132. [

The cathode DC transmission line 144 has one DC line for transmission of the cathode DC power, and the earth can be used as the return path of the electric current. One or more switches may be placed on this DC line.

The demand side cathode direct current filter 146 includes an inductor L 4 and a capacitor C 4 and DC-filters the cathode direct current power transmitted through the cathode direct current transmission line 144.

AC converter 151 includes a positive DC-to-AC converter 151 and a negative DC-to-AC converter 152 and the bipolar DC-to-AC converter 151 includes one or more three-phase valve bridge 151a, , And cathode DC-to-AC converter 152 includes one or more three-phase valve bridges 152a.

The demand side transformer part 160 includes one or more transformers 161 each corresponding to one or more three-phase valve bridges 151a for the anode and one or more transformers 161 corresponding to one or more three-phase valve bridges 152a And one or more transformers 162.

When one three-phase valve bridge 151a is used for the anode, the anode DC-to-AC converter 151 can generate AC power having six pulses using the anode DC power. At this time, the primary coil and the secondary coil of the transformer 161 may have a Y-Y connection or a Y-delta connection.

When two three-phase valve bridges 151a are used for the anode, the anode DC-to-AC converter 151 can generate AC power having 12 pulses using the anode DC power. At this time, the primary coil and the secondary coil of one of the two transformers 161 may have a YY-shaped connection, and the primary coil and the secondary coil of the other transformer 161 may have a Y- It may have a connection.

When three three-phase valve bridges 151a are used for the positive pole, the positive pole dc-to-AC converter 151 can generate ac power having eighteen pulses using positive pole dc power. The greater the number of pulses of AC power, the lower the price of the filter.

When one three-phase valve bridge 152a is used for the cathode, the cathode DC-to-AC converter 152 can generate AC power having six pulses using cathode DC power. At this time, the primary coil and the secondary coil of the one transformer 162 may have a Y-Y connection or a Y-delta connection.

When two three-phase valve bridges 152a are used for the cathode, the cathode DC-to-AC converter 152 can generate AC power having 12 pulses using cathode DC power. At this time, the primary coil and the secondary coil of one of the two transformers 162 may have a YY-shaped connection, and the primary coil and the secondary coil of the other transformer 162 may have Y- It may have a connection.

When three three-phase valve bridges 152a are used for the cathode, the cathode DC-to-AC converter 152 can generate AC power with eighteen pulses using cathode DC power. The greater the number of pulses of AC power, the lower the price of the filter.

4 shows a connection of a transformer and a three-phase valve bridge according to an embodiment of the present invention.

Particularly, Fig. 4 shows the connection of two transformers 121 for the anode and two three-phase valve bridges 131a for the anode. The connection of two transformers 122 for a negative electrode and two three-phase valve bridges 132a for a negative electrode, connection of two transformers 161 for an anode and two three-phase valve bridges 151a for an anode, Two transformers 162 for the negative pole and two three-phase valve bridges 152a for the negative pole, one transformer 121 for the positive pole and one three-phase valve bridge 131a for the positive pole, And the connection of one transformer 161 for one pole and one three-phase valve bridge 151a for the positive pole can be easily derived from the embodiment of Fig. 4, and therefore the illustration and description thereof are omitted.

4, a transformer 121 having a YY-shaped wiring is referred to as an upper transformer, a transformer 121 having a Y-shaped wiring is referred to as a lower transformer, a three-phase valve bridge 131a connected to an upper transformer is referred to as an upper three- The three-phase valve bridge 131a connected to the valve bridge and the lower transformer is referred to as a lower three-phase valve bridge.

The upper three-phase valve bridge and the lower three-phase valve bridge have a first output OUT1 and a second output OUT2, which are two output terminals for outputting DC power.

The upper three-phase valve bridge includes six valves D1-D6, and the lower three-phase valve bridge includes six valves D7-D12.

The valve D1 has a cathode connected to the first output OUT1 and an anode connected to the first terminal of the secondary coil of the upper transformer.

The valve D2 has a cathode connected to the anode of the valve D5 and an anode connected to the anode of the valve D6.

The valve D3 has a cathode connected to the first output OUT1 and an anode connected to the second terminal of the secondary coil of the upper transformer.

The valve D4 has a cathode connected to the anode of the valve D1 and an anode connected to the anode of the valve D6.

The valve D5 has a cathode connected to the first output OUT1 and an anode connected to the third terminal of the secondary coil of the upper transformer.

The valve D6 has a cathode connected to the anode of the valve D3.

The valve D7 has a cathode connected to the anode of the valve D6 and an anode connected to the first terminal of the secondary coil of the lower transformer.

The valve D8 has a cathode connected to the anode of the valve D11 and an anode connected to the second output OUT2.

The valve D9 has a cathode connected to the anode of the valve D6 and an anode connected to the second terminal of the secondary coil of the lower transformer.

The valve D10 has a cathode connected to the anode of the valve D7 and an anode connected to the second output OUT2.

The valve D11 has a cathode connected to the anode of the valve D6 and an anode connected to the third terminal of the secondary coil of the lower transformer.

The valve D12 has a cathode connected to the anode of the valve D9 and an anode connected to the second output OUT2.

On the other hand, at least one of the transmission side AC-DC converter part 130 and the demand side DC-AC converter part 150 may include the converter device 200.

The converter device 200 can convert DC power into AC power using a plurality of sub modules 210. [

In addition, the converter device 200 can convert AC power to DC power using a plurality of sub modules 210. [

The configuration of the converter device 200 will be described with reference to FIG.

5 is a block diagram of the configuration of the converter device 200. As shown in Fig.

The converter device 200 includes a submodule 210, an intermediate controller 230, and a valve controller 250.

The sub-module 210 receives the AC power and converts it into DC power.

In addition, the sub-module 210 may receive DC power and convert it into AC power.

For example, the submodule 210 can perform charging, discharging, and bypass operations by receiving DC power.

The submodule 210 includes a submodule sensor 211, a submodule control unit 213, a switching unit 217, and a storage unit 219.

The sub-module sensor 211 can measure at least one of the current and the voltage of the sub-module 210.

In addition, the sub-module sensor 211 can sense the physical state of the sub-module 210 as well.

For example, the sub-module sensor 211 may sense one or more of the physical cracks and temperatures of the sub-module 210.

The sub-module control unit 213 can control the overall operation of the sub-module 210. [

For example, the sub-module control unit 213 can control the current and voltage measurement operation of the sub-module sensor 211, the switching operation of the switching unit 217, and the like.

In addition, the sub-module control unit 213 may transmit the sub-module status signal to at least one of the valve controller 250 and the intermediate controller 230.

Here, the sub-module status signal may be a signal including at least one of the current measured by the sub-module sensor 211, the voltage, the sensed physical crack, and the temperature.

In addition, the sub-module status signal may include a response signal indicating whether or not the control signal is received.

For example, the sub-module control unit 213 may receive a control signal from at least one of the valve controller 250 and the intermediate controller 230, and may transmit a response signal corresponding to the received control signal.

The switching unit 217 can switch the current input to and output from the submodule 210.

The switching unit 217 may include at least one switch, and may perform a switching operation according to a control signal of the sub-module control unit 213. [

In addition, the switching unit 217 may include a diode, and may perform charging, discharging, and bypassing operations of the sub-module 210 by the switching operation and the rectifying operation of the diode.

The storage unit 219 can perform a charging operation for charging energy based on the current input to the submodule 210.

Further, the storage unit 219 can perform a discharging operation of outputting a current based on the charged energy.

Meanwhile, in the converter device 200 of the present invention, the submodule 210 may be formed of a thyristor.

Referring to FIG. 6, the connection of a plurality of sub-modules 210 included in the converter device 200 will be described.

6 shows the connection of a plurality of submodules 210 included in the three-phase converter device 200. FIG.

6, a plurality of submodules 210 may be connected in series, and a plurality of submodules 210 connected to one positive or negative electrode of the phase may be configured as an arm have.

The three-phase converter device 200 can be generally composed of six arms and can be composed of six arms composed of an anode and a cathode for each of the three phases A, B and C .

Accordingly, the converter device 200 includes a first arm 221 composed of a plurality of submodules 210 for the A-phase anode, a second arm 221 composed of a plurality of submodules 210 for the A- 222, a third arm 223 composed of a plurality of submodules 210 for the B-phase anode, a fourth arm 224 composed of a plurality of submodules 210 for the B-phase cathode, a C- And a sixth arm 226 composed of a plurality of sub modules 210 for C-type cathodes.

And a plurality of submodules 210 for one phase can constitute a leg.

Accordingly, the converter device 200 includes an A-phase leg 227 comprising a plurality of submodules 210 for phase A and a B-phase leg 228 including a plurality of submodules 210 for phase B, And a C-phase leg 229 including a plurality of sub-modules 210 for C-phase.

Thus, the first arm 221 to the sixth arm 226 are included in the A, B, and C-phase legs 227, 228, and 229, respectively.

Specifically, the A-phase leg 227 includes a first arm 221, which is a cathode arm of A phase, and a second arm 222, which is a cathode arm. A third arm 223, which is a B phase anode arm, And a fourth arm 224 which is a cathode arm. The C-phase leg 229 includes a fifth arm 225, which is a C-phase anode arm, and a sixth arm 226, which is a cathode arm.

Next, the configuration of the sub module 210 will be described with reference to FIG.

7 is an exemplary view of the configuration of the sub-module 210. As shown in FIG.

Referring to FIG. 7, the submodule 210 includes two switches, two diodes, and a capacitor. The form of the sub-module 210 is also referred to as a half-bridge type or a half-bridge inverter.

The switch included in the switching unit 217 may include a power semiconductor.

Here, a power semiconductor refers to a semiconductor device for a power device, and can be optimized for power conversion and control. Power semiconductors are also called valve devices.

Accordingly, the switch included in the switching unit 217 can be formed of a power semiconductor, and is constructed of, for example, an insulated gate bipolar transistor (IGBT), a gate turn-off thyristor (GTO), or an integrated gate commutated thyristor .

The storage unit 219 includes a capacitor, so that energy can be discharged and discharged.

On the other hand, the sub-module 210 can be represented as an equivalent model based on the configuration and operation of the sub-module 210.

8 shows an equivalent model of the sub-module 210. Referring to FIG. 8, the sub-module 210 can be represented by an energy charging and discharging device composed of a switch and a capacitor.

Accordingly, it can be confirmed that the submodule 210 is the same as the energy charging and discharging device having the output voltage Vsm.

Next, the operation of the sub module 210 will be described with reference to FIGS. 9 to 12. FIG.

The switch portion 217 of the submodule 210 of FIGS. 9 to 12 includes a plurality of switches T1 and T2, and each switch is connected to each of the diodes D1 and D2. The storage unit 219 of the sub-module 210 includes a capacitor.

The charging and discharging operation of the sub-module 210 will be described with reference to Figs. 9 and 10. Fig.

9 and 10 show the capacitor voltage (Vsm) formation of the submodule 210. FIG.

9 and 10, the switch T1 of the switch unit 217 is turned on and the switch T2 is turned off. Accordingly, the sub-module 210 can form a capacitor voltage according to each switch operation.

9, the current flowing into the sub-module 210 is transmitted to the capacitor through the diode D1 to form a capacitor voltage. And the formed capacitor voltage can charge the capacitor with energy.

And the submodule 210 may perform a discharge operation to discharge the charged energy.

10, the storage energy of the capacitor, which is the energy charged in the sub-module 210, is output through the switch T1. Thus, sub-module 210 may emit stored energy.

The bypass operation of the sub module 210 will be described with reference to FIGS. 11 and 12. FIG.

11 and 12 show the zero voltage formation of the submodule 210. FIG.

11 and 12, the switch T1 of the switch unit 217 is turned off and the switch T2 is turned on. Accordingly, no current flows through the capacitor of the sub-module 210, and the sub-module 210 can form a zero voltage.

11, the current flowing into the submodule 210 is outputted through the switch T2 so that the submodule 210 can form a zero voltage.

Referring to FIG. 12, the current flowing into the sub-module 210 is output through the diode D2 so that the sub-module 210 can form a zero voltage.

In this way, the sub-module 210 can form a zero voltage, thereby performing a bypass operation in which the flowing current does not flow into the sub-module 210.

See FIG. 5 again.

The intermediate controller 230 may receive the control signal transmitted by the valve controller 250 and transmit the control signal to the sub module 210.

For example, the intermediate controller 230 may receive a control signal for the control operation of the sub-module 210 from the valve controller 250 connected to the intermediate controller 230.

The intermediate controller 230 may transmit the received control signal to a plurality of sub modules 210 connected to the intermediate controller 230.

5, the intermediate controller 230 may include a second sensor unit 231, a second control unit 233, a second communication unit 235, and an interface unit 237.

The second sensor unit 231 may sense the physical state of the intermediate controller 230.

For example, the relay second sensor unit 231 can detect at least one of the physical crack and temperature of the intermediate controller 230.

The second controller 233 can control the overall operation of the intermediate controller 230. [

For example, the second controller 233 can control the operation of transmitting the control signal received by the intermediate controller 230 to the sub-module 210. [

The second controller 233 may transmit a control signal to each of the plurality of sub-modules 210 connected to the intermediate controller 230.

For example, the second controller 233 can transmit a control signal corresponding to each of the plurality of submodules 210 based on the control signal received from the valve controller 250.

The second controller 233 receives the status information of the connected sub module 210 and determines whether the sub module 210 needs to perform a protection operation based on the received status information.

The second controller 233 may control the connected sub module 210 to perform a protection operation based on the determination of whether or not the protection operation is required.

The contents of the protection operation will be described later.

Also, the second controller 233 can determine whether the control signal of the connected sub module 210 is received based on the response signal transmitted from the connected sub module 210.

For example, the second controller 233 transmits a control signal to the connected sub module 210, receives a response signal corresponding to the received control signal, and determines whether the sub module 210 has received the control signal have.

The second communication unit 235 can exchange data with the sub-module 210, another intermediate controller 230, and the valve controller 250.

For example, the second communication unit 235 can transmit and receive data to and from the first communication unit 255 included in the valve controller 250.

The second communication unit 235 can transmit and receive data between the intermediate controller 230 including the second communication unit 235 and another intermediate controller 230.

The second communication unit 235 can transmit and receive data to and from the sub-module control unit 213 included in the sub-module 210.

The interface unit 237 can be connected to an external device.

The interface unit 237 is connected to an external device and can transmit status information of the connected sub module 210.

For example, the interface unit 237 may transmit status information of a plurality of connected submodules 210, including an HMI (Human Machine Interface).

In addition, the interface unit 237 is connected to an external device and can receive software necessary for the operation of the sub-module 210.

The valve controller 250 may control the overall operation of the converter device 200. [

For example, the valve controller 250 may control the overall operation of the converter device 200, including VBE (Valve Base Electronics).

Specifically, the valve controller 250 may include a first sensor unit 251, a first control unit 253, and a first communication unit 255.

The first sensor unit 251 may measure at least one of the current and voltage of the AC parts 110 and 170 and the DC transmission part 140 associated with the controller 250.

The first control unit 253 can control the overall operation of the converter device 200.

Specifically, the first controller 253 receives the total command value from the control part 190, which is an upper controller, and controls the overall operation of the converter device 200 based on the received total command value.

Here, the total command value may mean a control signal for the control part 190 to control the converter device 200.

The first control unit 253 can generate a control signal based on the total command value received from the control part 190. [

For example, the first control unit 253 may control the converter 230 based on at least one of the reference effective power, the reference reactive power, the reference current, and the reference voltage, which are command values received from the control unit 190 through the first communication unit 255, And may control the operation of the device 200.

Also, the first control unit 253 can directly calculate the entire control value.

Here, the total control value may be a target value for the voltage, current, and frequency magnitude of the output AC power of the converter device 200.

For example, the first control unit 253 may control the entire control value based on at least one of the current and voltage of the AC parts 110 and 170 and the current and voltage of the DC transmission part 140 associated with the converter device 200. [ Can be calculated.

The first communication unit 255 can exchange data with at least one of the second communication unit 235 included in the intermediate controller 230, the sub-module control unit 213 of the sub-module 210, and the control unit 190 .

Specifically, the first communication unit 255 may transmit data to at least one of the second communication unit 235, the sub-module control unit 213, and the control unit 190 based on the signal received from the first control unit 253 .

The first communication unit 255 may transmit the data received from at least one of the second communication unit 235, the sub module control unit 213 and the control unit 190 to the first control unit 253.

13 to 15, the signal line connection of each configuration of the converter device 200 will be described.

Figs. 13 to 15 are conceptual diagrams showing signal line connection of each configuration of the converter device 200. Fig.

Referring to FIG. 13, the valve controller 250 may be directly connected to each of the plurality of submodules 210.

Accordingly, the valve controller 250 can directly transmit a control signal for each of the plurality of submodules 210 to each of the plurality of submodules 210.

In addition, the valve controller 250 can directly receive submodule status signals transmitted by each of the plurality of submodules 210.

Meanwhile, the valve controller 250 and the submodule 210 may be connected by one or more connecting lines.

For example, the valve controller 250 and the sub-module 210 may be connected to a control signal line for transmitting a control signal and a status signal line for transmitting a sub-module status signal.

In addition, the valve controller 250 may be coupled to each of the plurality of sub-modules 210 via one or more intermediate controllers 230.

Referring to FIG. 14, the valve controller 250 may be connected to a plurality of intermediate controllers 230.

Each of the plurality of intermediate controllers 230 may be connected to each of the plurality of sub modules 210.

Accordingly, the valve controller 250 can directly transmit a control signal for each of the plurality of sub-modules 210 to each of the plurality of the intermediate controllers 230 directly.

In addition, the valve controller 250 can directly receive submodule status signals transmitted by each of the plurality of intermediate controllers 230. [

Accordingly, each of the plurality of intermediate controllers 230 can directly transmit the received control signal to each of the plurality of sub-modules 210. [

Each of the plurality of sub-modules 210 can receive a control signal from the intermediate controller 230.

Meanwhile, the valve controller 250, the intermediate controller 230, the intermediate controller 230, and the submodule 210 may be connected by one or more connecting lines.

In addition, the intermediate controller 230 can be directly connected to the other intermediate controller 230.

This will be described with reference to FIG.

Referring to FIG. 15, each of the plurality of intermediate controllers 230 may be directly connected to another intermediate controller 230.

Accordingly, each of the plurality of intermediate controllers 230 can transmit or receive at least one of the other intermediate controller 230 and the control signal, submodule status signal.

An operation method of the converter device 200 will be described with reference to FIG.

16 is a flowchart showing an operation method of the converter device 200. Fig.

The valve controller 250 receives the total command value from the control part 190 which is an upper controller (S110).

The valve controller 250 can receive the entire command value transmitted by the control part 190 through the first communication part 255. [

The valve controller 250 generates a control signal for each of the plurality of submodules 210 based on the received total command value (S120).

The first controller 253 of the valve controller 250 may generate control signals for each of the plurality of submodules 210 based on the received total command value.

The valve controller 250 transmits the generated control signal to the intermediate controller 230 (S130).

The valve controller 250 may transmit the generated control signal to each of the plurality of intermediate controllers 230 through the first communication unit 255. [

The intermediate controller 230 transmits the received control signal to each of the plurality of sub modules 210 (S140).

Each of the plurality of intermediate controllers 230 may transmit the received control signal to each of the plurality of submodules 210.

Each of the plurality of sub modules 210 operates based on the received control signal (S150).

Each of the plurality of sub modules 210 can convert AC power into DC power based on the received control signal.

In addition, each of the plurality of sub modules 210 can convert DC power into AC power based on the received control signal.

The sub-module 210 detects the state of the sub-module (S160).

For example, the sub-module 210 can sense at least one of the current, voltage, physical crack, and temperature of the sub-module 210 through the sub-module sensor 211.

The sub-module 210 transmits the sub-module status signal to the intermediate controller 230 (S170).

The sub-module 210 may transmit a sub-module status signal to the intermediate controller 230, which is a signal including at least one of sensed current, voltage, physical cracking, and temperature.

The intermediate controller 230 transmits the received sub-module status signal to the valve controller 250 (S180).

Each of the plurality of intermediate controllers 230 may transmit the submodule status signal received from the plurality of submodules 210 to the valve controller 250.

The valve controller 250 generates a control signal for each of the plurality of sub-modules 210 based on the sub-module status signal received from the intermediate controller 230 (S190).

The valve controller 250 may generate control signals for each of the plurality of submodules 210 based on the submodule status signal for each of the plurality of submodules 210 received from the plurality of intermediate controllers 230 have.

The valve controller 250 may transmit the generated control signal to each of the plurality of submodules 210 through a plurality of intermediate controllers 230.

In this manner, the plurality of sub modules 210 form respective output voltages corresponding to the respective control signals, so that the converter device 200 can output AC power.

The AC power output from the converter device 200 will be described with reference to FIG.

17 is a graph showing AC power output from the converter device 200. As shown in Fig.

17, voltages formed by a plurality of sub modules 210 connected to one leg are combined to form a stepped waveform close to a sine, It can be confirmed that the output power of the AC power is AC power.

The protection operation of the converter device 200 will be described with reference to Fig.

18 is a flowchart of the protection operation of the converter device 200. As shown in FIG.

Referring to FIG. 18, the sub-module 210 detects the state of the sub-module (S210).

The sub-module sensor 211 of the sub-module 210 can sense the status of the sub-module including at least one of the measured current, voltage, sensed physical crack, and temperature of the sub-module.

The sub-module 210 transmits information about the sensed sub-module status to the intermediate controller 230 (S220).

The sub-module 210 may communicate the sub-module status signal to the connected intermediate controller 230.

The intermediate controller 230 receives the sub-module status signal transmitted by the sub-module 210 (S230).

The intermediate controller 230 may receive submodule status signals transmitted by each of the plurality of connected submodules 210.

The intermediate controller 230 determines whether the sub module 210 is abnormal based on the received sub module status signal (S240).

The intermediate controller 230 compares at least one of the current, voltage, sensed physical crack, and temperature of the sub-module 210 included in the received sub-module status signal with a reference value, ) Can be judged.

For example, when the temperature of the sub-module 210 is higher than the reference value, the intermediate controller 230 may determine that the sub-module 210 is abnormal.

If it is determined in step S240 that there is an error in the sub module 210, the intermediate controller 230 generates a protection operation signal for the sub module 210 (S250).

The intermediate controller 230 may generate a protection operation signal for protecting the sub module 210 judged to be abnormal.

The intermediate controller 230 transmits the generated protection operation signal to the sub module 210 (S260).

The intermediate controller 230 may transmit a protection operation signal to the sub-module 210 to protect the sub-module 210.

The sub module 210 performs a protection operation based on the transmitted protection operation signal (S270).

The sub module 210 may perform a protection operation based on the received protection operation signal and may transmit a response signal to the intermediate controller 230 indicating that the protection operation signal has been received.

The sub-module 210 may also transmit a response signal to the intermediate controller 230 indicating that the protection operation has been performed.

On the other hand, if it is determined in step S240 that there is no abnormality in the sub module 210, the intermediate controller 230 returns to step S230 and repeats the above-described process.

In this way, the intermediate controller 230 can determine whether the sub-module 210 is abnormal without going through the valve controller 250, and can perform the protection operation based on the determination result.

In addition, the converter device 200 may monitor the operation state of the sub-module 210 connected through the intermediate controller 230.

This will be described with reference to FIG.

19 is a conceptual diagram of the monitoring operation of the sub-module 210 via the intermediate controller 230. FIG.

The intermediate controller 230 may be connected to an external device through the interface unit 237 and may transmit status information of the sub-module 210 to an external device connected thereto.

19, when the monitoring device 310 is connected to one of the plurality of intermediate controllers 230, the intermediate controller 230 to which the monitoring device 310 is connected is connected to the intermediate controller 230 The status information of each of the plurality of connected sub-modules 210 can be transmitted.

Accordingly, the status information of each of the plurality of sub modules 210 can be checked through the monitoring device 310 connected to the intermediate controller 230.

In addition, the converter device 200 can upgrade the software of the sub-module 210 connected via the intermediate controller 230. [

This will be described with reference to FIG.

20 is a conceptual diagram of a software upgrade operation of the submodule 210 via the intermediate controller 230. FIG.

The intermediate controller 230 may be connected to an external device through the interface unit 237 and may receive the software upgrade file from the connected external device.

20, when the terminal device 320 is connected to one of the plurality of intermediate controllers 230, the intermediate controller 230 to which the terminal device 320 is connected is connected to the terminal device 320 You can receive a software upgrade file.

The intermediate controller 230 may transmit the received software upgrade file to each of the plurality of connected submodules 210.

Accordingly, the software upgrade file can be simultaneously transmitted to each of the plurality of sub modules 210 connected to the intermediate controller 230.

Each of the plurality of sub modules 210 may execute the received software upgrade file to perform a software upgrade operation.

In this way, the intermediate controller 230 can provide status information to the external device so as to monitor the status information of the sub-module 210 without going through the valve controller 250.

In addition, the intermediate controller 230 can transmit a software upgrade file to each of the plurality of connected sub-modules 210, thereby upgrading the firmware of the plurality of sub-modules 210 at the same time.

According to an embodiment of the present invention, the above-described method can be implemented as a code readable by a processor on a medium on which a program is recorded. Examples of the medium that can be read by the processor include ROM, RAM, CD-ROM, magnetic tape, floppy disk, optical data storage, etc., and may be implemented in the form of a carrier wave (e.g., transmission over the Internet) .

The embodiments described above are not limited to the configurations and methods described above, but the embodiments may be configured by selectively combining all or a part of the embodiments so that various modifications can be made.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, It will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the present invention.

Claims

A converter device comprising a plurality of sub-modules in an HVDC system,
Module for receiving the total command value for controlling the power conversion operation of the converter device from the host controller of the HVDC system and generating a control signal for the operation of each of the plurality of submodules based on the received total command value, ;
An intermediate controller receiving the control signal generated from the valve controller and transmitting the received control signal to each of the plurality of submodules; And
And a sub-module for receiving the control signal from the intermediate controller and generating an output voltage based on the received control signal
Converter device.

The method according to claim 1,
The intermediate controller
Module status signal transmitted from each of the plurality of sub-modules, determines whether the sub-module is abnormal based on the received sub-module status signal, and if at least one of the plurality of sub- And transmits a protection operation signal to the sub module judged as abnormal
Converter device.

3. The method of claim 2,
The submodule status signal
A signal including information on at least one of voltage, current, temperature, and physical cracking of the submodule
Converter device.

The method of claim 3,
The intermediate controller
Module, and determines whether or not the sub-module is abnormal by comparing at least one of voltage, current, temperature, and physical cracking of the sub-module included in the sub-module status signal with a reference value
Converter device.

The method according to claim 1,
The valve controller
A first sensor unit for measuring at least one of a voltage and a current of the system connected to the converter device,
A first controller for generating the control signal based on the total command value,
And a first communication unit for transmitting the generated control signal to the intermediate controller
Converter device.

The method according to claim 1,
The intermediate controller
A second sensor unit for sensing at least one of a physical crack and temperature of the intermediate controller,
A second controller for controlling a transmission operation of transmitting the control signal to each of the plurality of submodules,
And a second communication unit for transmitting the control signal to each of the plurality of submodules
Converter device.

The method according to claim 6,
The intermediate controller
And an interface unit connected to the external device to transmit and receive data,
The status information of the sub-module connected to the intermediate controller is transmitted to the external device, and the status information of the sub-module connected to the intermediate controller is displayed on the external device
Converter device.

The method according to claim 6,
The intermediate controller
And an interface unit connected to the external device to transmit and receive data,
Receives the software upgrade file for the submodule from the external device, and transmits the received software upgrade file to the connected submodule
Converter device.

The method according to claim 1,
The sub-
A submodule sensor for sensing at least one of current, voltage, temperature, and physical cracks of the submodule;
A sub-module control unit for controlling the operation of generating the output voltage based on the received control signal;
A switching unit for switching a current input to and output from the sub-module through the control of the sub-module control unit;
And a storage unit for storing energy according to a switching operation of the switching unit
Converter device.