Direct current transmission device simulation system

Abstract

The application provides a DC power transmission device simulation system, the DC power transmission device comprises at least two DC poles, the DC power transmission device simulation system comprises: a control and protection device for controlling and protecting a DC pole of the two DC poles; a simulator comprising a primary circuit simulation unit and a control and protection system simulation unit; the primary circuit simulation unit simulates a primary circuit of the DC power transmission device; the control and protection system simulation unit simulates a control and protection system of another DC pole of the two DC poles; and an interface device for inter-pole communication data between the control and protection device and the control and protection system simulation unit.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of high-voltage direct current transmission and flexible direct current transmission, in particular to a direct current transmission device simulation system. BACKGROUND

[0002] With the wide application of high-voltage direct current transmission systems and flexible direct current transmission systems, in order to better operate the direct current transmission system, training and research need to be carried out through a simulation system.

[0003] Traditional direct current transmission simulation systems are divided into two types: computer simulation systems based on power system simulation software and hardware-in-the-loop simulation systems based on actual physical devices.

[0004] In the computer simulation system based on power system simulation software, the control protection system and the primary circuit are simulated in the simulation software, and there is no real-time performance.

[0005] In the hardware-in-the-loop simulation system based on actual physical devices, the simulation system is composed of control protection devices and simulators, wherein each direct current pole is configured with a control protection device, and the simulator is only used to simulate the primary circuit of two poles, and real-time simulation can be performed.

[0006] Due to the symmetry characteristics of the two direct current poles of the direct current transmission system, in the hardware-in-the-loop simulation system, if each direct current pole is respectively configured with a control protection device, although the direct current transmission system can be more accurately simulated, the system cost is higher.

[0007] The above information disclosed in the background section is only used to strengthen the understanding of the background of the present application, and therefore it can include information which does not constitute prior art known to those of ordinary skill in the art. SUMMARY

[0008] The present application proposes a direct current transmission device simulation system, the direct current transmission device comprising at least two direct current poles, and the direct current transmission device simulation system comprising:

[0009] a control protection device for controlling and protecting a direct current pole of the two direct current poles;

[0010] a simulator comprising a primary circuit simulation unit and a control protection system simulation unit:

[0011] the primary circuit simulation unit simulates a primary circuit of the direct current transmission device;

[0012] the control protection system simulation unit simulates a control protection system of another direct current pole of the two direct current poles;

[0013] an interface device for inter-pole communication data between the control protection device and the control protection system simulation unit.

[0014] According to some embodiments, the DC power transmission device comprises:

[0015] a high voltage DC power transmission device based on line-commutated converters; or

[0016] a flexible DC power transmission device based on voltage source converters; or

[0017] a hybrid DC power transmission device based on line-commutated converters and voltage source converters.

[0018] The high voltage DC power transmission device, the flexible DC power transmission device or the hybrid DC power transmission device comprises at least one rectifier and one inverter.

[0019] According to some embodiments, further comprising:

[0020] a power module characteristic simulation device for simulating the working characteristics of power modules in line-commutated converters or voltage source converters.

[0021] According to some embodiments, further comprising:

[0022] an operator operation system for operating the DC power transmission device simulation system to pole, de-pole, operate switches or breakers, raise or lower power, and / or set protection values.

[0023] According to some embodiments, the control and protection device comprises pole control device or / and converter control device, pole protection device or / and converter protection device.

[0024] According to some embodiments, the simulator is used to establish physical or mathematical modeling of the controlled object, simulate steady-state, transient and dynamic processes of the controlled object, including RTDS, RTLAB, Labview RT, dSPACE, LABCAR, ADPSS, and / or HYPERSIM.

[0025] According to some embodiments, the primary circuit simulation unit comprises AC system, converter, switch / breaker, DC line and ground electrode line.

[0026] The control and protection system simulation unit comprises pole control system or / and converter control system, pole protection system or / and converter protection system.

[0027] According to some embodiments, the primary circuits of the two DC poles have symmetry.

[0028] According to some embodiments, the first DC pole and the second DC pole respectively comprise a valve group / converter, a converter transformer, a DC pole neutral bus switch, a DC filter, a smoothing reactor, a DC filter isolation switch, a pole bus isolation switch and a metal return line isolation switch.

[0029] According to some embodiments, the control protection device collects or receives analog signals and switch / gap position signals of the primary circuit simulation unit, and sends control signals to the primary circuit simulation unit to control the first DC pole.

[0030] According to some embodiments, the control protection system simulation unit collects analog signals and switch / gap position signals of the primary circuit simulation unit, and outputs control signals to the primary circuit simulation unit to control the second DC pole.

[0031] According to some embodiments, the first DC pole and the second DC pole operate in a bipolar power control mode.

[0032] If the first DC pole is blocked, the control protection system simulation unit receives a pole blocking signal of the control protection device through the interface device, and increases the power of the second DC pole.

[0033] If the second DC pole is blocked, the control protection device receives a pole blocking signal of the control protection system simulation unit through the interface device, and increases the power of the first DC pole.

[0034] The technical scheme provided by the embodiments of the present application can reduce the system cost while ensuring the simulation accuracy by configuring the control protection device only in the first DC pole and simulating the control protection system of the second DC pole in the simulator.

[0035] It should be understood that the above general description and the following detailed description are only exemplary and do not limit the present application. BRIEF DESCRIPTION OF DRAWINGS

[0036] The above and other objects, features and advantages of the present application will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings. The drawings described below are only some embodiments of the present application, not a limitation of the present application.

[0037] Figure 1A A schematic diagram of a grid commutated converter structure of an exemplary embodiment is shown;

[0038] Figure 1B A schematic diagram of a voltage source converter structure of an exemplary embodiment is shown;

[0039] Figure 2 A schematic diagram of a voltage source converter structure of an exemplary embodiment is shown; Figure 1AA schematic diagram of a high voltage direct current transmission structure of a line commutated converter.

[0040] Figure 3 A schematic diagram of a direct current transmission device simulation system according to an example embodiment. DETAILED DESCRIPTION

[0041] Example embodiments now will be described more fully hereinafter with reference to the accompanying drawings. Example embodiments, however, can be implemented in many different forms and should not be construed as 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 scope of example embodiments to those skilled in the art. Like reference numerals refer to like elements throughout the several views.

[0042] The described features, structures, or characteristics can be combined in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of embodiments of the disclosure. One skilled in the relevant art will recognize, however, that the technology can be practiced without one or more of the specific details, or with other methods, components, materials, and so forth. In some instances, well-known structures, methods, devices, implementations, materials, and operations are not shown or described in detail.

[0043] The flow diagrams shown in the Figures should be understood as illustrative only and not necessarily set in stone in terms of including all content and operations / steps, and not necessarily executed in the order described. For example, some operations / steps can be broken down further, while some operations / steps can be combined or partially combined, so the actual order of execution can be changed according to actual circumstances.

[0044] The terms "first", "second", and the like, in the description and in the claims of the present application and in the above description of the drawings merely mean different objects and do not necessarily imply a specific order or sequence. Also, the terms "comprises", "comprising", and the like, are intended to encompass not only the listed steps or units, but also other steps or units not listed, or other steps or units inherent to the process, method, product, or apparatus. The terms "comprises", "comprising", and the like, are intended to encompass not only the listed steps or units, but also other steps or units not listed, or other steps or units inherent to the process, method, product, or apparatus.

[0045] Those skilled in the art will understand that the drawings are merely schematic and that the modules or flows in the drawings do not necessarily have to be implemented in order to implement the present application, and therefore should not be used to limit the scope of protection of the present application.

[0046] The traditional hardware-in-the-loop simulation system based on actual physical devices for a DC power transmission system needs to configure control and protection devices at each DC pole, which occupies a large space and has a high cost. Since the bipolar of the DC power transmission system has symmetry, configuring control and protection devices at only one DC pole and simulating the other DC pole through a simulator can basically meet the simulation accuracy requirement.

[0047] Therefore, the application provides a DC power transmission device simulation system, which configures control and protection devices at one DC pole, simulates the control and protection system of the other DC pole through a simulator, and exchanges information between the poles through an interface device to realize bipolar simulation of the DC power transmission device.

[0048] The DC power transmission of the application includes at least one of high-voltage DC power transmission based on a grid commutated converter, flexible DC power transmission based on a voltage source converter, and hybrid DC power transmission based on a grid commutated converter and a voltage source converter.

[0049] The embodiments of the application are described in detail below with reference to the accompanying drawings.

[0050] Figure 1A A schematic diagram of a grid commutated converter structure is shown.

[0051] As shown in Figure 1A , the grid commutated converter adopts a twelve-pulse bridge circuit, which includes twelve bridge arms 1, each of which includes thyristors in series. X1 and X2 represent the cathode end and the anode end of the DC side of the grid commutated converter, respectively.

[0052] Figure 1B A schematic diagram of a voltage source converter structure is shown.

[0053] As shown in Figure 1B , the voltage source converter adopts a modular multilevel converter, which includes six bridge arms, each of which includes N sub-modules 2 and an inductor 3 in series. The sub-module 2 is a half-bridge structure or a full-bridge structure. The half-bridge structure sub-module includes two IGBT devices 4 and one capacitor 5. The full-bridge structure sub-module includes four IGBT devices 6 and one capacitor 7. X3 and X4 represent the positive end and the negative end of the DC side of the voltage source converter, respectively.

[0054] Figure 2 A schematic diagram of a high-voltage DC power transmission structure using Figure 1A a grid commutated converter is shown.

[0055] As shown in Figure 2As shown, the direct current power transmission device is a high voltage direct current power transmission device. The high voltage direct current power transmission device main circuit includes a rectifier station 100, an inverter station 200, a first direct current line 150, a second direct current line 160, a rectifier station ground electrode line 114, a rectifier station ground electrode 115, and an inverter station ground electrode line 214, an inverter station ground electrode 215.

[0056] According to an example embodiment, the rectifier station 100 includes a first direct current electrode 110, a second direct current electrode 120, a first alternating current filter bank 118, a first alternating current system 140, and converter transformer incoming line switches 131 and 133, a metal return line transfer switch 113, an earth return line transfer switch 190, bipolar neutral zone isolation disconnect switches 174, 175, 184, and 185.

[0057] According to an example embodiment, the first direct current electrode 110 includes a first valve bank / converter 111, a first converter transformer 116, a first direct current electrode neutral bus switch 119, a first direct current filter 93, a first smoothing reactor 91, a first direct current filter isolation disconnect switch 171, a first electrode bus isolation disconnect switch 172, and a first metal return line isolation disconnect switch 173.

[0058] According to an example embodiment, the first valve bank / converter 111 is a line commutated converter. The line commutated converter includes, but is not limited to, at least one of a six-pulse bridge circuit, a twelve-pulse bridge circuit. The bridge circuit includes, but is not limited to, non-blockable semi-controlled power semiconductor devices, typically thyristor devices.

[0059] According to an example embodiment, the second direct current electrode 120 includes a second valve bank / converter 121, a second converter transformer 126, a second direct current electrode neutral bus switch 129, a second direct current filter 94, a second smoothing reactor 92, a second direct current filter isolation disconnect switch 181, a second electrode bus isolation disconnect switch 182, and a second metal return line isolation disconnect switch 183.

[0060] According to an example embodiment, the second valve bank / converter 121 is a line commutated converter.

[0061] According to an example embodiment, the inverter station 200 includes a third direct current electrode 210, a fourth direct current electrode 220, a second alternating current filter bank 218, a second alternating current system 240, and converter transformer incoming line switches 231 and 233, a ground electrode line isolation disconnect switch 213, a metal return line isolation disconnect switch 290, bipolar neutral zone isolation disconnect switches 274, 275, 284, and 285.

[0062] According to an example embodiment, the third DC pole 210 comprises a third valve group / converter 211, a third converter transformer 216, a third DC pole neutral bus switch 219, a third DC filter 97, a third smoothing reactor 95, a third DC filter isolation switch 271, a third pole bus isolation switch 272, and a third metal return isolation switch 273.

[0063] According to an example embodiment, the third valve group / converter 211 is a line commutated converter.

[0064] According to an example embodiment, the fourth DC pole 220 comprises a fourth valve group / converter 221, a fourth converter transformer 226, a fourth DC pole neutral bus switch 229, a fourth DC filter 98, a fourth smoothing reactor 96, a fourth DC filter isolation switch 281, a fourth pole bus isolation switch 282, and a fourth metal return isolation switch 283.

[0065] According to an example embodiment, the fourth valve group / converter 221 is a line commutated converter.

[0066] According to some embodiments, at least one of the above-mentioned various switches, including but not limited to mechanical switches, breakers, DC circuit breakers.

[0067] According to an example embodiment, the rectifier station 100 is connected to the ground electrode 115 through the ground electrode line 114. The inverter station 200 is connected to the ground electrode 215 through the ground electrode line 214. When sending power in positive direction, the first AC system 140 of the rectifier station 100 converts AC power into DC power through its first valve group / converter 111, and sends the DC power to the inverter station 200 through the DC lines 150, 160. The inverter station 200 converts the DC power into AC power through its third valve group / converter 211, and sends the AC power to the second AC system 240 of the inverter station 200, thereby realizing positive direction sending of DC power. The converters of the rectifier station generally operate in current control, and the converters of the inverter station generally operate in voltage control or maximum firing angle control (AMAX).

[0068] According to an example embodiment, the analog signals collected by the rectifier station 100 and the inverter station 200 are: high voltage bus current IDH, low voltage bus current IDNC on the DC side of the converter, pole bus current IDL, pole neutral bus current IDNE, DC filter head current IZT1, ground electrode current IDEL, pole bus voltage UDL and pole neutral bus voltage UDN, and AC bus voltage UAC (three-phase) of the first AC system 140 and the second AC system 240, and AC current IAC (three-phase) flowing into the converter transformer.

[0069] According to an example embodiment, the primary circuit (or main circuit) of the pole I and the pole II has symmetry. The first DC pole 110 and the second DC pole 120 have symmetry, such as the first DC pole 110 including the first valve group / converter 111, the first converter transformer 116, the second DC pole 120 including the second valve group / converter 121, the second converter transformer 126; the third DC pole 210 and the fourth DC pole 220 have symmetry, such as the third DC pole 210 including the third valve group / converter 211, the third converter transformer 216, the fourth DC pole 220 including the fourth valve group / converter 221, the fourth converter transformer 226. Therefore, the control and protection device of the first DC pole 110 and the third DC pole 210 is implemented by the control and protection device, and the control and protection device of the second DC pole 120 and the fourth DC pole 220 is simulated in the simulator.

[0070] According to an example embodiment, the first DC pole 110 and the third DC pole 210 constitute the pole I of the high-voltage direct current transmission, and the second DC pole 120 and the fourth DC pole 220 constitute the pole II of the high-voltage direct current transmission.

[0071] Figure 3 A schematic diagram of a direct current transmission device simulation system according to an example embodiment is shown.

[0072] As shown in Figure 3 , the direct current transmission device simulation system includes a control and protection device 8, a simulator 9 and an interface device 10.

[0073] According to an example embodiment, the control and protection device 8 is used to control and protect a DC pole of two DC poles, and the first DC pole 110 and the third DC pole 210 constitute a DC pole, i.e. the pole I, as shown in Figure 2 .

[0074] According to an example embodiment, the simulator 9 includes a primary circuit simulation unit 11 and a control and protection system simulation unit 12. The primary circuit simulation unit 11 is used to simulate the direct current transmission device, including the rectifier station 100, the inverter station 200, the first DC line 150, the second DC line 160, the rectifier station ground pole line 114, the rectifier station ground pole 115 and the inverter station ground pole line 214, the inverter station ground pole 215, switches / switches, as shown in Figure 2 . The control and protection system simulation unit 12 is used to control and protect another DC pole of two DC poles, and the second DC pole 120 and the fourth DC pole 220 constitute another DC pole, i.e. the pole II, as shown in Figure 2 .

[0075] According to an example embodiment, the interface device 10 is used to control and protect the interaction of the control and protection device 8 and the control and protection system simulation unit 12 in the simulator 9.

[0076] The control and protection device 8 receives analog signals and switch / disconnector position signals from the primary circuit simulation unit 11 of the simulator 9, and sends control signals to the simulator 9 to control the valve group / converter and switch / disconnector of the DC pole of the primary circuit simulation unit 11 of the simulator 9. The control and protection device 8 exchanges inter-pole communication signals with the control and protection system simulation unit 12 in the simulator 9 through the interface device 10. The control and protection system simulation unit 12 acquires analog signals and switch / disconnector position signals from the primary circuit simulation unit 11 of the simulator 9, and outputs control signals to the simulator 9 to control the valve group / converter and switch / disconnector of the other DC pole.

[0077] by Figure 2 For example, the control and protection device 8 receives or collects the high-voltage bus current IDH, low-voltage bus current IDNC, pole bus current IDL, pole neutral bus current IDNE, DC filter head-end current IZT1, grounding pole current IDDL, pole bus voltage UDL and pole neutral bus voltage UDN from the first DC pole 110 and third DC pole 210 of the primary circuit simulation unit 11 of the simulator 9, as well as the AC bus voltage UAC (three-phase) of the first AC system 140 and the second AC system 240, and the AC current IAC (three-phase) flowing into the converter transformer; The protection device 8 receives or acquires the position signals of the converter transformer incoming line switches 131 and 231, the first DC filter isolation switch 171, the first pole bus isolation switch 172, the first metallic return line isolation switch 173, the bipolar neutral zone isolation switches 174, 175, 274, and 275, the third DC filter isolation switch 271, the third pole bus isolation switch 272, the third metallic return line isolation switch 273, the metallic return line changeover switch 113, the first DC polar neutral bus switch 119, and the third DC polar neutral bus switch 219 from the primary circuit simulation unit 11 of the simulator 9. When the first DC pole 110 and the third DC pole 210 are started, the control and protection device 8 sends a signal to close the converter transformer incoming line switches 131 and 231, the first DC filter isolation switch 171, the first pole bus isolation switch 172, the bipolar neutral zone isolation switches 174, 175, 274, and 275, the third DC filter isolation switch 271 and the third pole bus isolation switch 272, the converter transformer incoming line switch 131, the metallic return line changeover switch 113, the first DC pole neutral bus switch 119, and the third DC pole neutral bus switch 219; and to open the first metallic return line isolation switch 173, the second metallic return line isolation switch 183, the third metallic return line isolation switch 273, the fourth metallic return line isolation switch 283, and the ground return line changeover switch 190. Once ready, the control and protection device 8 sends pulse signals to the first valve group / converter 111 and the third valve group / converter 211, and the first DC pole 110 and the third DC pole 210 are unlocked and power is transmitted.

[0078] Similarly, the control and protection system simulation unit 12 collects the high voltage bus current IDH, low voltage bus current IDNC, pole bus current IDL, pole neutral bus current IDNE, DC filter head current IZT1, ground pole current IDEL, pole bus voltage UDL and pole neutral bus voltage UDN of the converter DC side of the second DC pole 120 and the fourth DC pole 220 of the primary circuit simulation unit 11 of the simulator 9, and the AC bus voltage UAC (three-phase) and the AC current IAC (three-phase) flowing into the converter transformer of the first AC system 140 and the second AC system 240; the control and protection system simulation unit 12 collects the position signals of the converter transformer incoming line switch 133, 233, the second DC filter isolation switch 181, the second pole bus isolation switch 182, the second metal return line isolation switch 183, the bipolar neutral area isolation switch 184, 185, the fourth DC filter isolation switch 281, the fourth pole bus isolation switch 282, the fourth metal return line isolation switch 283, the bipolar neutral area isolation switch 284, 285, the metal return line transfer switch 113, the second DC pole neutral bus switch 129, the ground return line transfer switch 190, and the fourth DC pole neutral bus switch 229 of the primary circuit simulation unit 11 of the simulator 9. When the second DC pole 120 and the fourth DC pole 220 are started, the control and protection device 8 sends a signal to close the converter transformer incoming line switch 133, 233, the second DC filter isolation switch 181, the second pole bus isolation switch 182, the bipolar neutral area isolation switch 184, 185, the fourth DC filter isolation switch 281, the fourth pole bus isolation switch 282, the bipolar neutral area isolation switch 284, 285, the metal return line transfer switch 113, the second DC pole neutral bus switch 129, and the fourth DC pole neutral bus switch 229; the first metal return line isolation switch 173, the second metal return line isolation switch 183, the third metal return line isolation switch 273, the fourth metal return line isolation switch 283, and the ground return line transfer switch 190 are separated. After being ready, the control and protection system simulation unit 12 sends a pulse signal to the second valve group / converter 121, the fourth valve group / converter 221, the second DC pole 120 and the fourth DC pole 220 are unlocked and transmit power.

[0079] The control protection device 8 and the control protection system simulation unit 12 exchange inter-pole communication signals through the interface device 10, such as the first DC pole 110 and the second DC pole 120 exchanging power information, and the third DC pole 210 and the fourth DC pole 220 exchanging power information. When the pole I and the pole II operate in the bipolar power control mode, the pole I is blocked, the control protection system simulation unit 12 receives the pole I blocking signal sent by the control protection device 8 through the interface device 10, and the power of the pole II is increased to compensate for the power loss caused by the blocking of the pole I; when the pole I and the pole II operate in the bipolar power control mode, the pole II is blocked, and the control protection device 8 receives the pole II blocking signal sent by the control protection system simulation unit 12 through the interface device 10, and the power of the pole I is increased to compensate for the power loss caused by the blocking of the pole II.

[0080] The DC power transmission device includes a high-voltage DC power transmission device based on a grid commutated converter, a flexible DC power transmission device based on a voltage source converter, or a hybrid DC power transmission device based on a grid commutated converter and a voltage source converter; the high-voltage DC power transmission device, the flexible DC power transmission device or the hybrid DC power transmission device at least includes a rectifier and an inverter.

[0081] The DC power transmission device simulation system further comprises a power module characteristic simulation device for simulating the working characteristics of the power module in the grid commutated converter or the voltage source converter.

[0082] The DC power transmission device simulation system further comprises an operator operation system for operating the DC power transmission device simulation system to start a pole, stop a pole, operate a switch or a knife switch, increase or decrease power, and set protection values. The operator operation system can communicate with the control protection device 8 or / and the control protection system simulation unit 12 to realize the above operations.

[0083] The control protection device 8 is an actual physical system, including a pole control device or / and a converter control device, a pole protection device or / and a converter protection device. The pole control device is used to control the switch / knife switch, DC filter or converter in the pole area; the converter control device is used to control the switch / knife switch and converter in the valve area; the pole protection device is used to protect the switch / knife switch, DC filter or converter in the pole area; and the converter protection device is used to protect the switch / knife switch and converter in the valve area.

[0084] According to an example embodiment, the switch / knife switch includes a switch (circuit breaker) and an isolation knife switch.

[0085] The simulator 9 is used to establish physical or mathematical modeling of the controlled object to simulate the steady-state, transient and dynamic processes of the controlled object. Common simulators for power systems include RTDS, RTLAB, Labview RT, dSPACE, LABCAR, ADPSS, and HYPERSIM.

[0086] The once-through circuit simulation unit 11 includes an AC system, a converter, a switch or a breaker, a DC line, and a ground electrode line; and the control and protection system simulation unit 12 includes a pole control system or / and a converter control system, a pole protection system or / and a converter protection system. The pole control system is used to control the switch / breaker, a DC filter, or a converter in the pole area; the converter control system is used to control the switch / breaker and the converter in the valve area; the pole protection system is used to protect the switch / breaker, the DC filter, or the converter in the pole area; and the converter protection system is used to protect the switch / breaker and the converter in the valve area.

[0087] It should be clearly understood that the present application describes how to form and use specific examples, but the present application is not limited to any details of these examples. Instead, based on the teachings of the disclosure of the present application, these principles can be applied to many other embodiments.

[0088] In addition, it should be noted that the above-described figures are only schematic representations of the processes included in the method according to the exemplary embodiments of the present application, and are not intended to be limiting. It is readily understood that the processes shown in the above-described figures do not indicate or limit the time sequence of these processes. In addition, it is readily understood that these processes can be executed, for example, synchronously or asynchronously in a plurality of modules.

[0089] The exemplary embodiments of the present application are specifically shown and described above. It is to be understood that the present application is not limited to the detailed configuration, arrangement, or implementation method described herein; rather, the present application is intended to encompass various modifications and equivalent arrangements within the spirit and scope of the appended claims.

Claims

1. A DC transmission device simulation system, characterized in that, The DC transmission device includes at least two DC poles, and the DC transmission device simulation system includes: A control and protection device is used to control and protect the DC poles of the two DC poles; The simulator includes a primary circuit simulation unit and a control and protection system simulation unit: The primary circuit simulation unit simulates the primary circuit of the DC transmission device. The control and protection system simulation unit simulates the control and protection system of the other DC pole of the two DC poles; An interface device is used for exchanging inter-electrode communication data between the control and protection device and the control and protection system simulation unit; One of the two DC poles is connected to the control and protection device, and the other DC pole is simulated through the simulator. The two DC poles exchange inter-pole information through the interface device to realize the bipolar simulation of the DC transmission device.

2. The simulation system according to claim 1, characterized in that, The DC transmission device includes: High-voltage direct current transmission equipment based on grid-commutated converters; or Flexible DC transmission devices based on voltage source converters; or Hybrid DC transmission device based on grid-commutated converter and voltage source converter; The high-voltage direct current transmission device, the flexible direct current transmission device, or the hybrid direct current transmission device includes at least one rectifier and one inverter.

3. The simulation system according to claim 1, characterized in that, Also includes: A power module characteristic simulation device is used to simulate the operating characteristics of power modules in grid-commutated converters or voltage source converters.

4. The simulation system according to claim 1, characterized in that, Also includes: The operator operating system is used by operators to operate the DC transmission device simulation system to start and stop the poles, operate switches or disconnectors, increase or decrease power, and / or set protection settings.

5. The simulation system according to claim 1, characterized in that, The control and protection device includes a pole control device and / or a converter control device, a pole protection device and / or a converter protection device.

6. The simulation system according to claim 1, characterized in that, The simulator is used to establish a physical or mathematical model of the controlled object and simulate the steady-state, transient and dynamic processes of the controlled object, including RTDS, RTLAB, LabVIEW RT, dSPACE, LABCAR, ADPSS, and / or HYPERSIM.

7. The simulation system according to claim 1, characterized in that: The primary circuit simulation unit includes an AC system, a converter, a switch / knife switch, a DC line, and a grounding electrode line; The control and protection system simulation unit includes a pole control system and / or a converter control system, a pole protection system and / or a converter protection system.

8. The simulation system according to claim 1, characterized in that: The primary circuits of the two DC poles are symmetrical.

9. The simulation system according to claim 1, characterized in that: The DC pole and the other DC pole respectively include a valve group / converter, a converter transformer, a DC pole neutral bus switch, a DC filter, a smoothing reactor, a DC filter isolating switch, a pole bus isolating switch, and a metallic return line isolating switch.

10. The simulation system according to claim 1, characterized in that: The control and protection device acquires or receives analog signals and switch / disconnector position signals from the primary circuit simulation unit, and sends control signals to the primary circuit simulation unit to control the DC electrode.

11. The simulation system according to claim 1, characterized in that: The control and protection system simulation unit acquires the analog signals and switch / disconnector position signals of the primary circuit simulation unit, and outputs control signals to the primary circuit simulation unit to control the other DC pole.

12. The simulation system according to claim 1, characterized in that: The DC pole and the other DC pole operate in a bipolar power control mode; If the DC pole is blocked, the control and protection system simulation unit receives the pole blocking signal from the control and protection device through the interface device and increases the power of the other DC pole. If the other DC pole is blocked, the control and protection device receives the pole blocking signal from the control and protection system simulation unit through the interface device and increases the DC pole power.

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