Short circuit control device, method and system of flexible direct current converter valve and medium

Abstract

The invention discloses a short circuit control device, method and system of a flexible direct current converter valve and a medium, and relates to the technical field of flexible direct current transmission of a power system. In the device, a gas output end of a gas storage device and a converter valve monitoring machine are both connected with a safety switch, a first electromagnetic valve is arranged between the safety switch and a cylinder, the cylinder is connected with a transmission rod, and a short circuit piece is arranged on the transmission rod. And the converter valve monitoring machine controls the first electromagnetic valve to be opened after controlling the safety switch to be opened, so that the gas in the gas storage device is transmitted to the air cylinder. The transmission rod is pushed to move along the first direction under the action of the cylinder, and the short-circuit piece is arranged on the transmission rod, so that the short-circuit piece can be driven by the transmission rod to short-circuit the positive electrode and the negative electrode of the capacitor in the converter valve sub-module, and discharge of the capacitor in the converter valve sub-module is completed. And a low-resistance special loop is formed through short circuit, so that charges can be quickly released, the discharge time is saved, the discharge efficiency is improved, and the electric energy transmission loss is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power system flexible HVDC transmission, in particular to a short-circuit control device, method and system of a flexible HVDC converter valve and a medium. BACKGROUND

[0002] Flexible HVDC transmission technology is an advanced power transmission technology based on voltage source converter, which has significant technical advantages and wide application prospects in new energy grid connection and grid interconnection. Large-capacity converter valve has become an indispensable core equipment of flexible HVDC transmission technology.

[0003] The flexible HVDC converter valve stores electric charge in the sub-module capacitor. At present, when the flexible HVDC converter valve is overhauled, the bridge arm short circuit is performed through the grounding knife switch on both sides of the bridge arm of the converter valve, and the discharge of the sub-module capacitor of the converter valve can only be naturally discharged through the built-in parallel resistance of the sub-module. According to the field experience and time constant τ, it generally takes more than 30 minutes to complete the preliminary discharge. According to the existing new energy transmission situation, taking a 3GW-level flexible HVDC converter valve capacity as an example, only 30 minutes of discharge waiting time will directly lose 1.5 million degrees of power transmission.

[0004] Therefore, how to improve the discharge efficiency to reduce the loss of power transmission is a technical problem that needs to be solved by those skilled in the art. SUMMARY

[0005] The purpose of the present application is to provide a short-circuit control device, method, system and medium of a flexible HVDC converter valve to solve the technical problem that the capacitor can only be naturally discharged by performing bridge arm short circuit through the grounding knife switch on both sides of the bridge arm of the converter valve, the discharge efficiency is low, and the loss of power transmission is large.

[0006] To solve the above technical problems, the present application provides a short-circuit control device of a flexible HVDC converter valve, which comprises: a gas storage device, a converter valve monitoring machine, a safety switch, a first electromagnetic valve, a gas cylinder, a transmission rod and a short-circuit piece located on the transmission rod.

[0007] The gas output end of the gas storage device is connected with the first end of the safety switch, the second end of the safety switch is connected with the converter valve monitoring machine, and the third end of the safety switch is connected with the input end of the first electromagnetic valve. The output end of the first electromagnetic valve is connected with the first end of the gas cylinder, and the second end of the gas cylinder is connected with the transmission rod.

[0008] The converter valve monitoring machine is used to control the first electromagnetic valve to be opened after the safety switch is opened, so that the gas in the gas storage device is transmitted to the gas cylinder.

[0009] The gas cylinder is configured to push the transmission rod to move in a first direction after receiving the gas, so that the shorting member on the transmission rod shorts the positive and negative poles of the capacitor in the converter valve sub-module.

[0010] The second electromagnetic valve is connected to the third end of the safety switch, and the output end of the second electromagnetic valve is connected to the second end of the gas cylinder.

[0011] The converter valve monitoring machine is configured to control the second electromagnetic valve to open after the safety switch is opened, so that the gas in the gas storage device is transmitted to the gas cylinder.

[0012] The gas cylinder is configured to push the transmission rod to move in a second direction after receiving the gas, so that the shorting member on the transmission rod disconnects the positive and negative poles of the capacitor in the converter valve sub-module; wherein the first direction is opposite to the second direction.

[0013] The bridge arm valve is arranged between the output end of the first electromagnetic valve and the first end of the gas cylinder; the converter valve monitoring machine is configured to control the bridge arm valve to open after the safety switch is opened, and control the first electromagnetic valve to open after the bridge arm valve is opened.

[0014] The bridge arm valve is also arranged between the output end of the second electromagnetic valve and the second end of the gas cylinder; the converter valve monitoring machine is configured to control the bridge arm valve to open after the safety switch is opened, and control the second electromagnetic valve to open after the bridge arm valve is opened.

[0015] The converter valve monitoring machine is configured to control the safety switch to open when receiving information indicating that the converter valve needs to be repaired; and control the first electromagnetic valve to open after the safety switch is opened, so that the gas in the gas storage device is transmitted to the gas cylinder.

[0016] The converter valve monitoring machine is configured to control the safety switch to open when receiving information indicating that the converter valve has been repaired; and control the second electromagnetic valve to open after the safety switch is opened, so that the gas in the gas storage device is transmitted to the gas cylinder.

[0017] The position detection device is connected to one end of the transmission rod; the other end of the position detection device is connected to the converter valve monitoring machine, configured to collect the position information of the transmission rod, and send the position information of the transmission rod to the converter valve monitoring machine.

[0018] The converter valve monitoring machine is used for determining whether the positive and negative poles of the capacitor are short-circuited or not short-circuited according to the position information of the transmission rod after the cylinder finishes pushing the transmission rod to move in the first direction.

[0019] The converter valve monitoring machine is used for determining whether the positive and negative poles of the capacitor are short-circuited or not short-circuited according to the position information of the transmission rod after the cylinder finishes pushing the transmission rod to move in the second direction.

[0020] Exemplarily, the pressure display device and the pressure regulator are sequentially arranged between the gas storage device and the safety switch.

[0021] The pressure regulator is used for adjusting the pressure value of the gas output by the gas storage device to a preset pressure value.

[0022] The cylinder is used for pushing the transmission rod to move in the first direction or pushing the transmission rod to move in the second direction after receiving the gas with the pressure value being the preset pressure value.

[0023] Exemplarily, the first grounding wire and the second grounding wire are further included.

[0024] After the short-circuiting member on the transmission rod short-circuits the positive and negative poles of the capacitor in the converter valve sub-module, in the case that there is one valve tower in the bridge arm, the valve-in valve side bus of the converter valve tower is short-circuited with the first grounding wire, and the valve-out valve side bus of the converter valve tower is short-circuited with the second grounding wire.

[0025] In the case that there are multiple valve towers in the bridge arm, the front side of the valve tower closest to the first end of the bridge arm in the multiple valve towers is short-circuited with the first grounding wire, and the rear end of the valve tower closest to the second end of the bridge arm in the multiple valve towers is short-circuited with the second grounding wire.

[0026] To solve the above technical problems, the application further provides a short-circuit control method of a flexible direct current converter valve, which is applied to a short-circuit control device of a flexible direct current converter valve, the short-circuit control device of the flexible direct current converter valve comprising a gas storage device, a converter valve monitoring machine, a safety switch, a first electromagnetic valve, a cylinder, a transmission rod, and a short-circuiting member on the transmission rod; a gas output end of the gas storage device is connected with a first end of the safety switch, a second end of the safety switch is connected with the converter valve monitoring machine, and a third end of the safety switch is connected with an input end of the first electromagnetic valve; an output end of the first electromagnetic valve is connected with a first end of the cylinder, and a second end of the cylinder is connected with the transmission rod; the method comprises the following steps:

[0027] The safety switch is controlled to be opened by the converter valve monitoring machine, and after the safety switch is controlled to be opened, the first electromagnetic valve is controlled to be opened, so that the gas in the gas storage device is transmitted to the gas cylinder;

[0028] The gas cylinder receives the gas, and after receiving the gas, the driving rod is driven to move in the first direction, so that the shorting piece on the driving rod shorts the positive and negative electrodes of the capacitor in the converter valve sub-module.

[0029] To solve the above technical problems, the application further provides a short-circuit control system of a flexible direct current converter valve, comprising:

[0030] A memory for storing a computer program;

[0031] A processor for executing the computer program to realize the steps of the short-circuit control method of the flexible direct current converter valve.

[0032] To solve the above technical problems, the application further provides a computer readable storage medium, which stores a computer program, and the computer program is executed by a processor to realize the steps of the short-circuit control method of the flexible direct current converter valve.

[0033] In the short-circuit control device of the flexible direct current converter valve, the gas output end of the gas storage device is connected with the first end of the safety switch, the second end of the safety switch is connected with the converter valve monitoring machine, and the third end of the safety switch is connected with the input end of the first electromagnetic valve; the output end of the first electromagnetic valve is connected with the first end of the gas cylinder, and the second end of the gas cylinder is connected with the driving rod. After the safety switch is controlled to be opened by the converter valve monitoring machine, the first electromagnetic valve is controlled to be opened, so that the gas in the gas storage device is transmitted to the gas cylinder. The driving rod is driven to move in the first direction under the action of the gas cylinder, and since the driving rod is provided with a shorting piece, the shorting piece can short the positive and negative electrodes of the capacitor in the converter valve sub-module under the driving of the driving rod, and the discharge of the capacitor in the converter valve sub-module is completed. Compared with the natural discharge mode of the capacitor, which relies on a weak leakage path and releases the charge very slowly, in the short-circuit control device of the flexible direct current converter valve provided by the application, a low-resistance special loop is formed by shorting, so that the charge can be quickly released, that is, the discharge time is saved and the discharge efficiency is improved. In the saved discharge time, the power transmission can be carried out, and the power transmission loss is reduced. Moreover, by arranging the safety switch in the device, the gas passage can be quickly cut off in abnormal conditions (such as personnel misoperation and equipment failure), so as to prevent the electromagnetic valve and the gas cylinder from accidentally acting to cause safety risks.

[0034] In addition, the application further provides a short-circuit control method of a flexible direct current converter valve, a short-circuit control system of a flexible direct current converter valve, and a computer readable storage medium, which have the same or corresponding technical features as the short-circuit control device of the flexible direct current converter valve mentioned above, and the effects are the same. Attached Figure Description

[0035] To more clearly illustrate the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0036] Figure 1 A short-circuit control device for a flexible DC converter valve is provided in an embodiment of the present invention;

[0037] Figure 2 An overall structural diagram of a short-circuit control device for a flexible DC converter valve provided in an embodiment of the present invention;

[0038] Figure 3 A topology diagram of a single submodule of a converter valve provided in an embodiment of the present invention;

[0039] Figure 4 A cross-sectional view of cylinder operation and a schematic diagram of short-circuiting of submodule capacitors are provided for embodiments of the present invention;

[0040] Figure 5 A wiring diagram of a flexible DC converter valve bridge arm provided in an embodiment of the present invention;

[0041] Figure 6 This is a structural diagram of the short-circuit control system for the flexible DC converter valve provided in an embodiment of the present invention.

[0042] The attached figures are labeled as follows:

[0043] 1-Gas storage device; 2-Converter valve monitoring unit; 3-Safety switch; 4-First solenoid valve; 5-Cylinder; 6-Transmission rod; 7-Short connector; 8-Pressure display device; 9-Pressure regulator; 10-Converter valve single sub-module. Detailed Implementation

[0044] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present invention.

[0045] The core of this invention is to provide a short-circuit control device, method, system, and medium for a flexible DC converter valve, in order to solve the technical problem that short-circuiting the bridge arm through the grounding switches on both sides of the converter valve bridge arm results in the capacitor being able to discharge naturally, leading to low discharge efficiency and significant power transmission loss.

[0046] In order to make the person skilled in the art better understand the present application, the present application is further described in detail below in combination with the drawings and specific embodiments. Figure 1 A short-circuit control device for a flexible direct current converter valve provided by an embodiment of the present application, as shown in Figure 1 , comprises a gas storage device 1, a converter valve monitoring machine 2, a safety switch 3, a first electromagnetic valve 4, a gas cylinder 5, a transmission rod 6, and a short-circuit piece 7 on the transmission rod 6.

[0047] The gas output end of the gas storage device 1 is connected with the first end of the safety switch 3, the second end of the safety switch 3 is connected with the converter valve monitoring machine 2, and the third end of the safety switch 3 is connected with the input end of the first electromagnetic valve 4; the output end of the first electromagnetic valve 4 is connected with the first end of the gas cylinder 5, and the second end of the gas cylinder 5 is connected with the transmission rod 6.

[0048] The converter valve monitoring machine 2 is used to control the first electromagnetic valve 4 to open after the safety switch 3 is controlled to open, so that the gas in the gas storage device 1 is transmitted to the gas cylinder 5.

[0049] The gas cylinder 5 is used to push the transmission rod 6 to move in a first direction after receiving the gas, so that the short-circuit piece 7 on the transmission rod 6 shorts the positive and negative electrodes of the capacitor in the converter valve sub-module.

[0050] The gas storage device 1 can store inert gas. The gas output end of the gas storage device 1 is connected with the first end of the safety switch 3, the safety switch 3 can be turned on to conduct the gas circuit, and the safety switch 3 can be turned off to cut off the gas circuit. The second end of the safety switch 3 is connected with the converter valve monitoring machine 2, that is, the opening or closing of the safety switch 3 can be controlled through the converter valve monitoring machine 2. The third end of the safety switch 3 is connected with the input end of the first electromagnetic valve 4, and the first electromagnetic valve 4 is also called a closing electromagnetic valve. In practice, when there are multiple bridge arms, the upper bridge arms of multiple phases can share one first electromagnetic valve 4, and the lower bridge arms of multiple phases can share one first electromagnetic valve 4, as shown in Figure 2 , Figure 2 The overall structure diagram of a short-circuit control device for a flexible direct current converter valve provided by an embodiment of the present application, there are A﹢ (representing the upper bridge arm of phase A), B﹢ (representing the upper bridge arm of phase B), C﹢ (representing the upper bridge arm of phase C), A- (representing the lower bridge arm of phase A), B- (representing the lower bridge arm of phase B), and C- (representing the lower bridge arm of phase C). Among them, A﹢, B﹢ and C﹢ share one electromagnetic valve; A-, B- and C- share one electromagnetic valve.

[0051] The output end of the first electromagnetic valve 4 is connected with the first end of the gas cylinder 5, and the second end of the gas cylinder 5 is connected with the transmission rod 6. The converter valve monitoring machine 2 controls the safety switch 3 to open. The action of controlling the safety switch 3 to open can be that the converter valve monitoring machine 2 controls the safety switch 3 to open when receiving information representing that the converter valve needs to be repaired.

[0052] After the control safety switch 3 is opened, the converter valve monitoring machine 2 controls the first electromagnetic valve 4 to open, so that the gas in the gas storage device 1 is transmitted to the gas cylinder 5. It is worth noting that the opening of the first electromagnetic valve 4 can be that the converter valve monitoring machine 2 sends an opening instruction to the first electromagnetic valve 4 to control the opening of the first electromagnetic valve 4, or the converter valve monitoring machine 2 sends a user an opening instruction of the first electromagnetic valve 4 to manually control the opening of the first electromagnetic valve 4.

[0053] After receiving the gas, the gas cylinder 5 drives the transmission rod 6 to move in the first direction, so that the short-circuit piece 7 on the transmission rod 6 short-circuits the positive and negative electrodes of the capacitor in the converter valve sub-module. The first direction is not limited, and is determined according to the position of the short-circuit piece 7 and the capacitor in practice, as long as the movement of the transmission rod 6 in the first direction can short-circuit the positive and negative electrodes of the capacitor. As shown in Figure 1 , the short-circuit piece 7 is driven by the transmission rod 6 to move to the dashed line position in Figure 1 , so as to short-circuit the positive and negative electrodes of the capacitor.

[0054] In order for those skilled in the art to better understand the short-circuit control process described above, the following will be described in conjunction with the drawings and examples.

[0055] Figure 3 A converter valve single sub-module topology provided for an embodiment of the present application is shown in Figure 3 , two IGBTs (Insulated Gate Bipolar Transistor) in the converter valve single sub-module 10 respectively form a branch with a respective anti-parallel diode, one of the IGBT branches is connected in parallel with a resistor R and a capacitor C, and the other IGBT branch is connected in series with a switch S1, and each part of the circuit is connected to each other to form a circuit topology containing a switch, a power semiconductor device, a resistor and a capacitor. The principle of realizing the short-circuit of the capacitor in the present application is that the two ends of the capacitor C are connected with the switch S2, and the switch is closed to realize the short-circuit of the positive and negative electrodes of the capacitor C and discharge.

[0056] Figure 4 A gas cylinder action profile and a schematic diagram of the short-circuit of the capacitor in the sub-module provided for an embodiment of the present application are shown in Figure 4 , the gas cylinder 5 is connected with the transmission rod 6, and the transmission rod 6 is provided with the short-circuit piece 7. In the closing process, the gas path is connected with the left side of the gas cylinder 5, the gas cylinder 5 drives the transmission rod 6 to move right, and when the transmission rod 6 drives the short-circuit piece 7 to move to the position of the capacitor, the positive and negative electrodes of the capacitor can be short-circuited, so that the capacitor is discharged. Figure 4In the embodiment, the multiple sub-modules of the converter valve realize the short circuit of the capacitors in the sub-modules under the action of the cylinder 5, that is, realize the discharge of the capacitors. After closing, the transmission rod 6 is connected with the main busbar of the converter valve tower, and the main busbar is grounded through the valve hall ground knife or ground wire.

[0057] In the short circuit control device of the HVDC converter valve provided in the embodiment, the gas output end of the gas storage device 1 is connected with the first end of the safety switch 3, the second end of the safety switch 3 is connected with the converter valve monitoring machine 2, the third end of the safety switch 3 is connected with the input end of the first electromagnetic valve 4, the output end of the first electromagnetic valve 4 is connected with the first end of the cylinder 5, and the second end of the cylinder 5 is connected with the transmission rod 6. After the safety switch 3 is controlled to be opened by the converter valve monitoring machine 2, the first electromagnetic valve 4 is controlled to be opened, so that the gas in the gas storage device 1 is transmitted to the cylinder 5. The transmission rod 6 is driven to move in the first direction under the action of the cylinder 5. Since the short-circuit piece 7 is arranged on the transmission rod 6, the short-circuit piece 7 can short the positive and negative electrodes of the capacitors in the converter valve sub-module under the driving of the transmission rod 6, so as to complete the discharge of the capacitors in the converter valve sub-module. Compared with the natural discharge mode of the capacitors, which relies on a weak leakage path and releases the electric charge very slowly, in the short circuit control device of the HVDC converter valve provided in the embodiment, the short circuit forms a low-resistance special loop, so that the electric charge can be quickly released, that is, the discharge time is saved and the discharge efficiency is improved. In the saved discharge time, the electric quantity can be transmitted, and the electric energy transmission loss is reduced. Moreover, by arranging the safety switch 3 in the device, the gas passage can be quickly cut off in an abnormal situation (such as personnel misoperation or equipment failure), so as to prevent the electromagnetic valve and the cylinder 5 from accidentally operating and causing safety risks.

[0058] The process in which the short circuit control device of the HVDC converter valve realizes the short circuit is described above. In actuality, after the discharge is completed, the converter valve needs to be switched to a running state. In order to ensure the normal operation of the converter valve, in some embodiments, the short circuit control device of the HVDC converter valve further comprises a second electromagnetic valve. The second electromagnetic valve is also called a tripping electromagnetic valve. The input end of the second electromagnetic valve is connected with the third end of the safety switch 3, and the output end of the second electromagnetic valve is connected with the second end of the cylinder 5.

[0059] The converter valve monitoring machine 2 is used to control the second electromagnetic valve to be opened after the safety switch 3 is controlled to be opened, so that the gas in the gas storage device 1 is transmitted to the cylinder 5.

[0060] The cylinder 5 is used to drive the transmission rod 6 to move in the second direction after receiving the gas, so that the short-circuit piece 7 on the transmission rod 6 disconnects the positive and negative electrodes of the capacitors in the converter valve sub-module. The first direction is opposite to the second direction.

[0061] The action of controlling the safety switch 3 to be opened can be that the converter valve monitoring machine 2 controls the safety switch 3 to be opened in the case of receiving information representing that the maintenance of the converter valve is completed.

[0062] Similarly, the second electromagnetic valve opening can be that the converter valve monitoring machine 2 sends an opening instruction to the second electromagnetic valve to control the second electromagnetic valve to open; or the converter valve monitoring machine 2 sends a user to represent the second electromagnetic valve opening instruction, and the user manually controls the second electromagnetic valve to open.

[0063] There is no limitation for the second direction, and the position of the short-circuiting piece 7 and the capacitor is determined according to the actual situation. As long as the transmission rod 6 moves along the second direction to disconnect the positive and negative electrodes of the capacitor (i.e. in the open state), the positive and negative electrodes of the capacitor are disconnected, that is, S2 in the formula Figure 3 is in an open state. Continue to combine the above Figure 4 , the process of disconnecting the positive and negative electrodes of the capacitor is explained. In the process of opening, the gas circuit is connected to the right side of the air cylinder 5, the air cylinder 5 drives the transmission rod 6 to move left, and when the transmission rod 6 drives the short-circuiting piece 7 to move to a position away from the capacitor, the positive and negative electrodes of the capacitor are in the open state. Figure 4 , it is also shown that multiple converter valve sub-modules are collectively controlled by the air cylinder 5 to disconnect the positive and negative electrodes of the capacitor in the sub-module, that is, the capacitor stops discharging, and the converter valve can be in a running state.

[0064] In order to realize the short-circuit control of the capacitor of the converter valve sub-module on a single bridge arm, in some embodiments, the short-circuit control device of the flexible DC converter further comprises a valve on the bridge arm; the valve on the bridge arm is arranged between the output end of the first electromagnetic valve 4 and the first end of the air cylinder 5; the converter valve monitoring machine 2 is used to control the valve on the bridge arm to open after controlling the safety switch 3 to open, and control the first electromagnetic valve 4 to open after the valve on the bridge arm is opened.

[0065] The valve on the bridge arm is also arranged between the output end of the second electromagnetic valve and the second end of the air cylinder 5; the converter valve monitoring machine 2 is used to control the valve on the bridge arm to open after controlling the safety switch 3 to open, and control the second electromagnetic valve to open after the valve on the bridge arm is opened.

[0066] The valve on the bridge arm can be realized by automatic control or manual control. Through the valve on the bridge arm, the short-circuit control of the capacitor of the converter valve sub-module on a single bridge arm is realized.

[0067] The cylinder 5 pushes the transmission rod 6 to move in the first direction after receiving the gas, and the shorting piece 7 on the transmission rod 6 shorts the positive and negative electrodes of the capacitor in the converter valve sub-module; and the cylinder 5 pushes the transmission rod 6 to move in the second direction after receiving the gas, and the shorting piece 7 on the transmission rod 6 disconnects the positive and negative electrodes of the capacitor in the converter valve sub-module. In order to ensure that the shorting is in place or not in place, in some embodiments, the short-circuit control device of the HVDC converter valve further comprises a position detection device. One end of the position detection device is connected with the transmission rod 6; the other end of the position detection device is connected with the converter valve monitoring machine 2, for collecting the position information of the transmission rod 6, and sending the position information of the transmission rod 6 to the converter valve monitoring machine 2.

[0068] The converter valve monitoring machine 2 is used to determine whether the shorting of the positive and negative electrodes of the capacitor is in place or not in place according to the position information of the transmission rod 6 after the cylinder 5 completes pushing the transmission rod 6 to move in the first direction.

[0069] The converter valve monitoring machine 2 is used to determine whether the shorting of the positive and negative electrodes of the capacitor is in place or not in place according to the position information of the transmission rod 6 after the cylinder 5 completes pushing the transmission rod 6 to move in the second direction.

[0070] As shown in Figure 4 , the position detection device provides a position feedback signal, which can be transmitted to the converter valve monitoring machine 2 to indicate whether the cylinder 5 is in place, and the converter valve monitoring machine 2 can remotely check the action of each cylinder 5, and the action feedback can complete the determination of the shielding of the position display of the cylinder 5.

[0071] In order to ensure that the gas in the gas storage device 1 has sufficient pressure, in some embodiments, the short-circuit control device of the HVDC converter valve further comprises a pressure display device 8 and a pressure regulator 9. The pressure display device 8 and the pressure regulator 9 are arranged between the gas storage device 1 and the safety switch 3 in sequence, as shown in Figure 2 The pressure regulator 9 is used to adjust the pressure value of the gas output by the gas storage device 1 to a preset pressure value.

[0072] The cylinder 5 is used to push the transmission rod 6 to move in the first direction or push the transmission rod 6 to move in the second direction after receiving the gas with the preset pressure value.

[0073] The preset pressure value is not limited, and is determined according to the actual situation.

[0074] In addition to the method of short-circuiting the capacitors in the submodule via the shorting connector 7 described above, to further ensure capacitor discharge, in some embodiments, the short-circuit control device of the flexible DC converter valve also includes a first grounding wire and a second grounding wire. After the shorting connector 7 on the transmission rod 6 short-circuits the positive and negative terminals of the capacitors in the converter valve submodule, when a valve tower exists in the bridge arm, the inlet valve side connector of the converter valve tower is short-circuited to the first grounding wire; the outlet valve side connector of the converter valve tower is short-circuited to the second grounding wire.

[0075] When there are multiple valve towers in the bridge arm, the front side of the valve tower closest to the first end of the bridge arm is short-circuited with the first grounding wire; the rear end of the valve tower closest to the second end of the bridge arm is short-circuited with the second grounding wire.

[0076] Figure 5 This is a wiring diagram of a flexible DC converter valve bridge arm provided for an embodiment of the present invention. Figure 5 As shown, valve towers 1' to N' are installed on the bridge arm. A first grounding wire is installed at the front end of valve tower 1', and a second grounding wire is installed at the rear end of valve tower N', thus completing the grounding of all valve towers in the bridge arm.

[0077] To enable those skilled in the art to better understand the short-circuit control device for the flexible DC converter valve provided by this invention, the following will again refer to the above text. Figure 2 The device will be described with specific embodiments.

[0078] The entire device includes a converter valve monitoring unit 2, a safety switch 3, a first solenoid valve 4 (closing solenoid valve), a second solenoid valve (opening solenoid valve), and a bridge arm valve ( Figure 2 (Not shown in the image) Inert gas cylinder. The short-circuit control device of the flexible DC converter valve is controlled by the converter valve monitoring unit 2, which issues an action command to control the opening state of the safety switch 3. After the safety switch 3 is in the open state, it can control the opening solenoid valve and closing solenoid valve to operate manually or remotely automatically. Each bridge arm gas line has a corresponding manual valve handle. After opening the valve handle, by adjusting the rated value of the inert gas output pressure, the cylinder 5 can push the transmission rod 6 on the valve tower to move. The transmission rod 6 short-circuits the positive and negative terminals of the sub-module capacitor on the valve tower, completing the sub-module discharge function.

[0079] Since the inert gas is stored in the gas cylinder, the gas pressure in each gas cylinder needs to be greater than a certain value (0.5 MPa by default), and can be adjusted through the pressure regulator 9. After confirming that the safety switch 3 and the bridge arm valve are opened, the gas cylinder gas pressure is pushed by the control solenoid valve to form a path for the inert gas in the pipeline, and the cylinder 5 is actuated to drive the transmission rod 6 to act, completing the short-circuiting and pulling apart of the sub-module. It should be noted that the switch command of the safety switch 3 is issued by the converter valve monitoring machine 2, and the safety switch 3 cannot be started before receiving the actuation command from the converter valve monitoring machine 2. The following on-off solenoid valve cannot be operated. At the same time, if the safety switch 3 command is successfully issued, the converter valve monitoring machine 2 will also feed back the switch action success signal.

[0080] After the cylinder 5 is actuated, the position feedback signal connected to the transmission rod 6 can be transmitted to the converter valve monitoring machine 2 to determine whether the cylinder 5 is actuated to the correct position. The converter valve monitoring machine 2 can remotely view the actuation of each cylinder 5, and the actuation feedback can complete the determination of the position display of the cylinder 5. As shown in the above Figure 4 .

[0081] The following is an example of the short-circuit control device of the HVDC converter valve to explain the process of short-circuiting the positive and negative electrodes of the capacitor and pulling apart the positive and negative electrodes. Figure 2

[0082] When the converter valve is under maintenance, the safety switch 3 is opened by the converter valve monitoring machine 2. After opening, the bridge arm valve is manually opened. If all the bridge arm towers need to be grounded and short-circuited, each bridge arm closing command manual valve needs to be opened, and the A+, B+, C+, A-, B-, and C- manual closing valves are opened (if a single or multiple towers need to be grounded and short-circuited, only the corresponding bridge arm manual closing valve needs to be opened). Then, the remote control closing solenoid valve is actuated or the manual control closing solenoid valve is actuated to drive the cylinder 5 to act, thereby short-circuiting the sub-module capacitor positive and negative electrodes. After the cylinder 5 is actuated, the position feedback signal connected to the transmission rod 6 can be transmitted to the converter valve monitoring machine 2 to determine whether the cylinder 5 is actuated to the correct position. The converter valve monitoring machine 2 can remotely view the actuation of each cylinder 5, and the actuation feedback can complete the determination of the position display of the cylinder 5. As shown in the above Figure 5 .

[0083] ​When the converter valve completes the maintenance work, the safety switch 3 is opened by the converter valve monitoring machine 2, and after the safety switch 3 is opened, the bridge arm valve is manually opened. If the whole bridge arm valve tower needs to be started, the bridge arm opening instruction manual valve needs to be opened, and the A+, B+, C+, A-, B- and C- manual opening valves are opened. If single or multiple valve towers need to be started, only the corresponding bridge arm manual opening valve needs to be opened. Then, the remote control electromagnetic valve is actuated or the manual control electromagnetic valve is actuated to actuate the push cylinder 5, so that the positive and negative electrodes of the sub-module capacitor are switched from short circuit to open circuit. After the pushing is completed, whether the opening is in place is detected by the background, and then each bridge arm opening manual valve is closed.

[0084] The short circuit control device of the HVDC converter valve is described above, and the embodiment also provides a short circuit control method of the HVDC converter valve, which is applied to the short circuit control device of the HVDC converter valve. The short circuit control device of the HVDC converter valve comprises a gas storage device 1, a converter valve monitoring machine 2, a safety switch 3, a first electromagnetic valve 4, a cylinder 5, a transmission rod 6 and a short-circuit piece 7 on the transmission rod 6. The gas output end of the gas storage device 1 is connected with the first end of the safety switch 3, the second end of the safety switch 3 is connected with the converter valve monitoring machine 2, and the third end of the safety switch 3 is connected with the input end of the first electromagnetic valve 4. The output end of the first electromagnetic valve 4 is connected with the first end of the cylinder 5, and the second end of the cylinder 5 is connected with the transmission rod 6. The method comprises:

[0085] The safety switch 3 is opened by the converter valve monitoring machine 2, and after the safety switch 3 is opened, the first electromagnetic valve 4 is opened, so that the gas in the gas storage device 1 is transmitted to the cylinder 5.

[0086] The gas is received by the cylinder 5, and after the gas is received, the transmission rod 6 is pushed to move in the first direction, so that the short-circuit piece 7 on the transmission rod 6 shorts the positive and negative electrodes of the capacitor in the HVDC converter valve sub-module.

[0087] The short circuit control method of the HVDC converter valve provided by the embodiment has the same or corresponding technical features as the short circuit control device of the HVDC converter valve described above. The embodiment of the short circuit control device of the HVDC converter valve has been described in detail above. Here, the embodiment of the short circuit control method of the HVDC converter valve will not be described again, and the effect is the same as above.

[0088] In the above embodiment, the short circuit control device of the HVDC converter valve is described in detail, and the present application also provides a corresponding embodiment of a short circuit control system of the HVDC converter valve from the hardware perspective.

[0089] Figure 6 The structure diagram of the short circuit control system of the HVDC converter valve provided by the embodiment of the present application is provided. The embodiment is based on the hardware perspective, as shown in Figure 6As shown, the short-circuit control system of the LCC includes:

[0090] a memory 20 for storing a computer program;

[0091] a processor 21 for implementing the steps of the short-circuit control method of the LCC as mentioned in the above embodiments when executing the computer program.

[0092] The processor 21 can include one or more processing cores, such as a 4-core processor, an 8-core processor, etc. The processor 21 can be implemented in at least one of a hardware form of a Digital Signal Processor (DSP), a Field-Programmable Gate Array (FPGA), a Programmable Logic Array (PLA). The processor 21 can also include a main processor and a coprocessor, the main processor being a processor for processing data in a wake-up state, also known as a Central Processing Unit (CPU), and the coprocessor being a low-power processor for processing data in a standby state. In some embodiments, the processor 21 can be integrated with a Graphics Processing Unit (GPU) for rendering and drawing the content to be displayed by the display screen. In some embodiments, the processor 21 can also include an Artificial Intelligence (AI) processor for processing machine learning-related computing operations.

[0093] The memory 20 can include one or more computer-readable storage media, which can be non-transitory. The memory 20 can also include a high-speed random access memory, and a non-volatile memory such as one or more disk storage devices, flash storage devices. In the present embodiment, the memory 20 is at least used to store the following computer program 201, wherein the computer program is loaded and executed by the processor 21, and can implement the related steps of the short-circuit control method of the LCC disclosed in any of the preceding embodiments. In addition, the resources stored by the memory 20 can also include an operating system 202 and data 203, etc., and the storage mode can be temporary storage or permanent storage. The operating system 202 can include Windows, Unix, Linux, etc. The data 203 can include but is not limited to the data involved in the short-circuit control method of the LCC mentioned above.

[0094] In some embodiments, the short-circuit control system of the LCC valve can further include a display screen 22, an input / output interface 23, a communication interface 24, a power supply 25, and a communication bus 26.

[0095] Those skilled in the art can understand that, Figure 6 The structure shown in the figure does not constitute a limitation on the short-circuit control system of the LCC valve, and can include more or fewer components than shown.

[0096] The short-circuit control system of the LCC valve provided by the embodiments of the present application includes a memory and a processor, and the processor can implement the following method when executing a program stored in the memory: a short-circuit control method of the LCC valve, and the effects are the same as above.

[0097] Finally, the present application also provides an embodiment corresponding to a computer-readable storage medium. The computer-readable storage medium stores a computer program, and the computer program is executed by a processor to implement the steps described in the above method embodiment.

[0098] It can be understood that if the method in the above embodiments is implemented in the form of a software function unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on such understanding, the technical solutions of the present application essentially or the part that contributes to the prior art or the whole or part of the technical solutions can be embodied in the form of a software product. The computer software product is stored in a storage medium, and executes all or part of the steps of the method described in each embodiment of the present application. The foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, and various media that can store program codes.

[0099] The computer-readable storage medium provided by the present application includes the short-circuit control method of the LCC valve mentioned above, and the effects are the same as above.

[0100] The above provides a kind of short-circuit control device, method, system and medium of LCC valve, which are described in detail.The progressive way is described in each embodiment in the specification, and each embodiment emphasizes the different place with other embodiments, and the same part of each embodiment is described in the specification.The method disclosed by the embodiment is described simply since it corresponds to the device disclosed by the embodiment, and the relevant part is described in the device part.The skilled in the art should be pointed out that, without departing from the principle of the present application, some improvements and modifications can be made to the present application, and these improvements and modifications also fall within the protection scope of the present application.

[0101] It also needs to be explained that in the present specification, the relational terms such as first and second and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus. An element proceeded by "comprises... a" does not, without more constraints, exclude the existence of additional identical elements in the process, method, article, or apparatus that comprises the element.

Claims

1. A short-circuit control device for a flexible DC converter valve, characterized in that, include: Gas storage device, converter valve monitoring unit, safety switch, first solenoid valve, cylinder, transmission rod and shorting component located on transmission rod; The gas output terminal of the gas storage device is connected to the first terminal of the safety switch, the second terminal of the safety switch is connected to the converter valve monitoring unit, and the third terminal of the safety switch is connected to the input terminal of the first solenoid valve; the output terminal of the first solenoid valve is connected to the first terminal of the cylinder, and the second terminal of the cylinder is connected to the transmission rod. The converter valve monitoring unit is used to control the first solenoid valve to open after the safety switch is turned on, so that the gas in the gas storage device can be transferred to the cylinder. The cylinder is used to push the transmission rod to move in a first direction after receiving gas, so that the shorting member on the transmission rod shorts the positive and negative terminals of the capacitor in the converter valve submodule.

2. The short-circuit control device for the flexible DC converter valve according to claim 1, characterized in that, It also includes a second solenoid valve; the input end of the second solenoid valve is connected to the third end of the safety switch, and the output end of the second solenoid valve is connected to the second end of the cylinder. The converter valve monitoring unit is used to control the second solenoid valve to open after the safety switch is turned on, so that the gas in the gas storage device can be transferred to the cylinder. The cylinder is used to push the transmission rod to move in a second direction after receiving gas, so that the shorting member on the transmission rod disconnects the positive and negative terminals of the capacitor in the converter valve submodule; wherein the first direction is opposite to the second direction.

3. The short-circuit control device for the flexible DC converter valve according to claim 2, characterized in that, It also includes a valve located on the bridge arm; the valve located on the bridge arm is located between the output end of the first solenoid valve and the first end of the cylinder; the converter valve monitoring unit is used to control the valve located on the bridge arm to open after the safety switch is opened, and to control the first solenoid valve to open after the valve located on the bridge arm is opened. The valve located on the bridge arm is also located between the output end of the second solenoid valve and the second end of the cylinder; the converter valve monitoring unit is used to control the valve located on the bridge arm to open after the safety switch is opened, and to control the second solenoid valve to open after the valve located on the bridge arm is opened.

4. The short-circuit control device for the flexible DC converter valve according to claim 2, characterized in that, The converter valve monitoring unit is used to control the safety switch to open when it receives information indicating that the converter valve needs maintenance; after controlling the safety switch to open, it controls the first solenoid valve to open so that the gas in the gas storage device can be transferred to the cylinder. The converter valve monitoring unit is used to control the safety switch to open when it receives information indicating that the converter valve has completed maintenance; After the safety switch is turned on, the second solenoid valve is turned on so that the gas in the gas storage device is transferred to the cylinder.

5. The short-circuit control device for the flexible DC converter valve according to claim 2, characterized in that, Also includes: A position detection device, one end of which is connected to the transmission rod; The other end of the position detection device is connected to the converter valve monitoring machine, and is used to collect the position information of the transmission rod and send the position information of the transmission rod to the converter valve monitoring machine; The converter valve monitoring unit is used to determine whether the positive and negative terminals of the capacitor are shorted in place or not, based on the position information of the transmission rod, after the cylinder completes pushing the transmission rod to move in the first direction. The converter valve monitoring unit is used to determine, based on the position information of the transmission rod, whether the positive and negative terminals of the capacitor are properly shorted or not.

6. The short-circuit control device for the flexible DC converter valve according to claim 5, characterized in that, It also includes a pressure display device and a pressure regulator; the pressure display device and the pressure regulator are sequentially disposed between the gas storage device and the safety switch; The pressure regulator is used to adjust the pressure of the gas output by the gas storage device to a preset pressure value; The cylinder is used to push the transmission rod to move in the first direction or to push the transmission rod to move in the second direction after receiving gas with a pressure value of the preset pressure value.

7. The short-circuit control device for the flexible DC converter valve according to claim 1, characterized in that, It also includes a first grounding wire and a second grounding wire; After the shorting device on the transmission rod shorts the positive and negative terminals of the capacitor in the converter valve submodule, when there is a valve tower in the bridge arm, the inlet valve side busbar of the converter valve tower is shorted to the first grounding wire; the outlet valve side busbar of the converter valve tower is shorted to the second grounding wire. In the case of multiple valve towers in the bridge arm, the front side of the valve tower closest to the first end of the bridge arm is short-circuited with the first grounding wire; the rear end of the valve tower closest to the second end of the bridge arm is short-circuited with the second grounding wire.

8. A short-circuit control method for a flexible DC converter valve, characterized in that, A short-circuit control device for a flexible DC converter valve includes a gas storage device, a converter valve monitoring unit, a safety switch, a first solenoid valve, a cylinder, a transmission rod, and a short-circuit connector located on the transmission rod. The gas output terminal of the gas storage device is connected to the first terminal of the safety switch, the second terminal of the safety switch is connected to the converter valve monitoring unit, and the third terminal of the safety switch is connected to the input terminal of the first solenoid valve. The output end of the first solenoid valve is connected to the first end of the cylinder, and the second end of the cylinder is connected to the transmission rod; the method includes: The safety switch is opened by the converter valve monitoring unit, and after the safety switch is opened, the first solenoid valve is opened so that the gas in the gas storage device is transferred to the cylinder. The cylinder receives gas and, upon receiving the gas, pushes the transmission rod to move in a first direction so that the shorting device on the transmission rod shorts the positive and negative terminals of the capacitor in the converter valve submodule.

9. A short-circuit control system for a flexible DC converter valve, characterized in that, include: Memory, used to store computer programs; A processor is configured to implement the steps of the short-circuit control method for the flexible DC converter valve as described in claim 8 when executing the computer program.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program that, when executed by a processor, implements the steps of the short-circuit control method for the flexible DC converter valve as described in claim 8.

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