Air cooling device for assisting heat dissipation of thyristor converter valve and converter valve heat dissipation system

Abstract

The application relates to the field of high-voltage power electronics, and discloses a forced air cooling device for assisting in heat dissipation of a thyristor converter valve and a converter valve heat dissipation system. The forced air cooling device comprises a fan, a power taking module and an energy storage module; the energy storage module comprises an energy storage capacitor, and the power taking module comprises a damping circuit, a first diode, a second diode, a third diode, a first resistor, a second resistor and a transistor voltage stabilizing circuit. The application takes power from the thyristor through the power taking module, stores the power in the energy storage module, and supplies power to the fan from the energy storage module to drive the fan to operate, so that the temperature of the thyristor converter valve can be lowered and the heat dissipation efficiency of the converter valve is improved.

Description

Technical Field

[0001] This invention relates to the field of high-voltage power electronics technology, and in particular to an air-cooling device and a converter valve heat dissipation system for assisting in the heat dissipation of thyristor converter valves. Background Technology

[0002] In high-voltage direct current (HVDC) transmission systems, the cooling system, as a crucial component of the thyristor converter valve heat dissipation system, directly impacts the overall power transmission capacity of the DC system. Therefore, ensuring the stable, reliable, and efficient operation of the cooling system is of paramount importance.

[0003] Currently, thyristor converter valve cooling systems generally use water cooling. While this method can remove most of the heat from the thyristor converter valve through the water cooling medium, it is difficult to remove the heat dissipated by the internal components of the thyristor converter valve, such as DC equalizing resistors and damping capacitors. This heat will be discharged into the valve hall, which is difficult to calculate accurately and cannot be handled by adjusting the valve hall air conditioning system.

[0004] Therefore, it is necessary to design an auxiliary cooling device for the thyristor converter valve, which can be used in conjunction with water cooling to dissipate heat from the thyristor converter valve. Summary of the Invention

[0005] This invention provides an air-cooling device and a thyristor converter valve heat dissipation system for assisting in the heat dissipation of thyristor converter valves, in order to complement the original water cooling method of thyristor converter valves, and solves the technical problem that the heat dissipation efficiency of the current water-cooled thyristor converter valve heat dissipation system still needs to be improved.

[0006] The first aspect of the present invention provides an air-cooling device for assisting in the heat dissipation of a thyristor converter valve, wherein the thyristor converter valve includes a thyristor, and the air-cooling device includes a fan, an energy harvesting module for harvesting energy from the thyristor, and an energy storage module for supplying power to the fan.

[0007] The energy storage module includes an energy storage capacitor, and the energy harvesting module includes a damping circuit, a first diode, a second diode, a third diode, a first resistor, a second resistor, and a transistor voltage regulator circuit. The anode of the thyristor is connected to one end of the damping circuit, and the other end of the damping circuit is connected to the cathode of the first diode and the anode of the second diode. The cathode of the second diode is connected to one end of the first resistor, the cathode of the third diode, and one end of the transistor voltage regulator circuit. The other end of the first resistor is connected to the anode of the third diode. The common terminal of the first resistor and the third diode is connected to one end of the energy storage capacitor. One end of the second resistor is connected to the transistor voltage regulator circuit. The other ends of the energy storage capacitor, the second resistor, and the transistor voltage regulator circuit are all connected to the cathode of the thyristor.

[0008] According to one achievable method of the first aspect of the invention, the damping circuit includes a damping capacitor and a damping resistor connected in series.

[0009] According to one embodiment of the first aspect of the invention, the transistor voltage regulator circuit includes a Zener diode and a transistor.

[0010] The base of the transistor is connected between the positive terminal of the Zener diode and one end of the second resistor, the collector of the transistor is connected to the negative terminal of the Zener diode, and the emitter of the transistor is connected to the cathode of the thyristor.

[0011] According to one achievable method of the first aspect of the invention, the energy storage module and the energy harvesting module are integrated on the same circuit board.

[0012] According to one embodiment of the first aspect of the invention, the air-cooling device is installed inside the corresponding layer of shielding of the thyristor converter valve.

[0013] A second aspect of the present invention provides a converter valve heat dissipation system, including the air-cooling device for assisting in the heat dissipation of the thyristor converter valve as described in any of the above-mentioned embodiments.

[0014] According to one embodiment of the second aspect of the invention, the converter valve cooling system further includes a water cooling device for cooling the thyristor converter valve.

[0015] As can be seen from the above technical solutions, the present invention has the following advantages:

[0016] The air-cooling device of the present invention includes a fan, an energy harvesting module, and an energy storage module. The energy storage module includes an energy storage capacitor. The energy harvesting module includes a damping circuit, a first diode, a second diode, a third diode, a first resistor, a second resistor, and a transistor voltage regulator circuit. The anode of the thyristor is connected to one end of the damping circuit, and the other end of the damping circuit is connected to the cathode of the first diode and the anode of the second diode. The cathode of the second diode is connected to one end of the first resistor, the cathode of the third diode, and one end of the transistor voltage regulator circuit. The other end of the first resistor is connected to the anode of the third diode. The common terminal of the first resistor and the third diode is connected to one end of the energy storage capacitor. One end of the second resistor is connected to the transistor voltage regulator circuit. The other ends of the energy storage capacitor, the second resistor, and the transistor voltage regulator circuit are all connected to the cathode of the thyristor. The present invention harvests energy from the thyristor through the energy harvesting module, stores the energy in the energy storage module, and supplies power to the fan to drive the fan. This can help reduce the temperature of the thyristor converter valve and improve the heat dissipation efficiency of the thyristor converter valve. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art 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.

[0018] Figure 1 A structural connection block diagram of an air-cooling device for assisting in heat dissipation of a thyristor converter valve, provided as an optional embodiment of the present invention;

[0019] Figure 2 This is a schematic diagram illustrating the working principle of an air-cooling device provided in an optional embodiment of the present invention.

[0020] Figure label:

[0021] 1-Fan; 2-Power harvesting module; 3-Energy storage module; T-Thyristor; C1-Energy storage capacitor; D1-First diode; D2-Second diode; D3-Third diode; R1-First resistor; R2-Second resistor; Cp1-Damping capacitor; Rp1-Damping resistor; D4-Zenith diode; Q1-Transistor. Detailed Implementation

[0022] This invention provides an air-cooling device and a thyristor converter valve heat dissipation system for assisting in the heat dissipation of thyristor converter valves, which solves the technical problem that the heat dissipation efficiency of current water-cooled thyristor converter valve heat dissipation systems still needs to be improved.

[0023] To make the objectives, features, and advantages of this invention more apparent and understandable, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described below are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0024] The present invention provides an air-cooling device for assisting in the heat dissipation of a thyristor converter valve, wherein the thyristor converter valve includes a thyristor T.

[0025] Please see Figure 1 , Figure 2 ,in Figure 1 This diagram shows a structural connection block diagram of an air-cooling device for assisting in the heat dissipation of a thyristor converter valve, according to an embodiment of the present invention. Figure 2 A schematic diagram illustrating the working principle of the air-cooling device provided in an embodiment of the present invention is shown.

[0026] An embodiment of the present invention provides an air-cooling device for assisting in the heat dissipation of a thyristor converter valve, comprising a fan 1, an energy harvesting module 2 for harvesting energy from the thyristor T, and an energy storage module 3 for supplying power to the fan 1.

[0027] The energy storage module 3 includes an energy storage capacitor C1, and the energy harvesting module 2 includes a damping circuit, a first diode D1, a second diode D2, a third diode D3, a first resistor R1, a second resistor R2, and a transistor voltage regulator circuit. The anode of the thyristor T is connected to one end of the damping circuit, and the other end of the damping circuit is connected to the cathode of the first diode D1 and the anode of the second diode D2. The cathode of the second diode D2 is connected to one end of the first resistor R1, the cathode of the third diode D3, and one end of the transistor voltage regulator circuit. The other end of the first resistor R1 is connected to the anode of the third diode D3. The common terminal of the first resistor R1 and the third diode D3 is connected to one end of the energy storage capacitor C1. One end of the second resistor R2 is connected to the transistor voltage regulator circuit. The other ends of the energy storage capacitor C1, the second resistor R2, and the transistor voltage regulator circuit are all connected to the cathode of the thyristor T.

[0028] Figure 2 In this circuit, the first diode D1 can be used to short-circuit the negative voltage, preventing damage to the entire energy harvesting and storage circuit. The energy storage capacitor C1 can store energy when the energy harvesting module 2 is not working, and then supply power when the energy harvesting module 2 is working, thereby driving the fan 1 to run.

[0029] The air-cooling device can be made relatively small to be fixed at the thyristor converter valve, and one or more air-cooling devices can be installed according to the actual heat dissipation needs.

[0030] In this embodiment of the invention, after the energy is extracted from the thyristor T by the energy extraction module 2, the energy is stored in the energy storage module 3. The energy storage module 3 supplies power to the fan 1 to drive the fan 1 to run. This can help reduce the temperature of the thyristor converter valve and improve the heat dissipation efficiency of the thyristor converter valve. It can be used in conjunction with the original water cooling device of the thyristor converter valve to quickly remove the heat from the thyristor converter valve.

[0031] In one feasible implementation, the damping circuit includes a damping capacitor Cp1 and a damping resistor Rp1 connected in series, such as... Figure 2 As shown.

[0032] In another possible way, it is possible to Figure 2Based on the damping circuit shown, multiple damping capacitors Cp1 are added to enhance the damping effect of the damping circuit. For example, the damping circuit can include two damping capacitors Cp1 and a damping resistor Rp1, with the two damping capacitors Cp1 connected in parallel and then connected to the damping resistor Rp1.

[0033] In another possible implementation, the damping circuit can also be a circuit consisting of a resistor and a rheostat connected in series and then connected in parallel with an inductor.

[0034] In the above embodiments of the present invention, the damping circuit can be used to limit the charging current, prevent the excessive charging current from damaging the corresponding subsequent circuit of the damping circuit, and change the voltage phase, so that the energy harvesting module 2 can be charged when it is not working.

[0035] In one feasible manner, the energy storage module 3 and the energy harvesting module 2 are integrated on the same circuit board, such as... Figure 2 As shown. The transistor voltage regulator circuit includes a Zener diode D4 and a transistor Q1; the base of the transistor Q1 is connected between the anode of the Zener diode D4 and one end of the second resistor R2, the collector of the transistor Q1 is connected to the cathode of the Zener diode D4, and the emitter of the transistor Q1 is connected to the cathode of the thyristor T. The corresponding working principle is as follows:

[0036] The VSIN terminal receives the mains frequency AC voltage. When the input voltage slope is positive, charging begins. When the output voltage is below 22V, the voltage continues to rise and charges the energy storage capacitor C1. When the output voltage is above 22V, the Zener diode D4 breaks down, the transistor Q1 conducts, and the output terminal is grounded, causing the voltage to drop below 22V. At this point, the Zener diode D4 is cut off, the transistor Q1 is turned off again, and the output voltage rises again. This keeps the output voltage at around 22V, forming a dynamic balance.

[0037] Shielding plays a crucial role in the normal operation and integrity of thyristor converter valves; therefore, thyristor converter valves are typically equipped with corresponding layers of shielding. In one feasible approach, to better achieve the heat dissipation effect of the air-cooling device on the thyristor converter valve, the air-cooling device is installed inside the corresponding layer of shielding of the thyristor converter valve.

[0038] It should be noted that the air-cooling device can also be installed in other locations around the thyristor converter valve, depending on the actual situation.

[0039] The present invention also provides a heat dissipation system for a thyristor converter valve, wherein the thyristor converter valve includes the air-cooling device for assisting in heat dissipation of the thyristor converter valve as described in any of the above embodiments.

[0040] In one feasible embodiment, the thyristor converter cooling system further includes a water-cooling device for cooling the thyristor converter valve. By combining air cooling with water cooling, the cooling of the thyristor converter valve is ensured, guaranteeing that all components of the thyristor converter valve receive balanced heat dissipation and preventing overheating.

[0041] It should be noted that the water cooling device is the original heat dissipation device of the thyristor converter valve, and its structure can refer to the existing water cooling structure. In this embodiment, it is not limited to this.

[0042] The above-described embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An air cooling device for assisting heat dissipation of a thyristor converter valve, the thyristor converter valve comprising thyristors, characterized in that, The air-cooling device includes a fan, an energy harvesting module for harvesting energy from the thyristor, and an energy storage module for supplying power to the fan. The energy storage module includes an energy storage capacitor, and the energy harvesting module includes a damping circuit, a first diode, a second diode, a third diode, a first resistor, a second resistor, and a transistor voltage regulator circuit. The anode of the thyristor is connected to one end of the damping circuit, and the other end of the damping circuit is connected to the cathode of the first diode and the anode of the second diode. The cathode of the second diode is connected to one end of the first resistor, the cathode of the third diode, and one end of the transistor voltage regulator circuit. The other end of the first resistor is connected to the anode of the third diode. The common terminal of the first resistor and the third diode is connected to one end of the energy storage capacitor. One end of the second resistor is connected to the transistor voltage regulator circuit. The other ends of the energy storage capacitor, the second resistor, and the transistor voltage regulator circuit are all connected to the cathode of the thyristor. The transistor voltage regulator circuit includes a Zener diode and a transistor; The base of the transistor is connected between the positive terminal of the Zener diode and one end of the second resistor, the collector of the transistor is connected to the negative terminal of the Zener diode, and the emitter of the transistor is connected to the cathode of the thyristor.

2. The air cooling device for assisting heat dissipation of a thyristor converter valve according to claim 1, characterized in that, The damping circuit includes a damping capacitor and a damping resistor connected in series.

3. The air cooling device for assisting heat dissipation of a thyristor converter valve according to claim 1, characterized in that, The energy storage module and the energy harvesting module are integrated on the same circuit board.

4. The air-cooling device for assisting in heat dissipation of thyristor converter valves according to claim 1, characterized in that, The air-cooling device is installed inside the corresponding layer of shielding of the thyristor converter valve.

5. A heat dissipation system for a converter valve, characterized in that Includes the air-cooling device for assisting in the heat dissipation of thyristor converter valves as described in any one of claims 1-4.

6. The converter valve heat dissipation system of claim 5, wherein, It also includes a water-cooling device for cooling the thyristor converter valve.

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