CN104953794B - High voltage direct current converter valve water cooling system - Google Patents

Abstract

The invention discloses a water cooling system for a high-voltage DC converter valve, which is composed of a main circulation circuit, a deionization circuit and a water supply branch. They are all connected through electric ball valves, and the main circulation loop includes a main circulation pump, a closed cooling tower, a main circulation filter, an inlet valve temperature transmitter, a main circulation flow transmitter, a Flow valve group, outlet valve temperature transmitter and degassing tank, and an electric three-way valve is installed between the main circulation pump and the closed cooling tower. The present invention can perform flow distribution according to the cooling capacity of different converter valves, so as to meet their different heat dissipation requirements, effectively reduce the number of water cooling systems, reduce operation difficulty, and save costs.

Description

HVDC Converter Valve Water Cooling System

technical field

The invention relates to a water cooling system for a high-voltage DC converter valve.

Background technique

During the operation of the high-voltage DC converter valve, its internal components such as thyristors, damping capacitors, voltage equalizing capacitors, damping resistors, voltage equalizing resistors, saturated reactors, and thyristor control units will generate a lot of heat. When the temperature exceeds its junction temperature, damage will occur causing DC blocking. Therefore, the intelligent closed water cooling circulation system has become a widely used converter valve cooling device due to its advantages of high reliability, high efficiency, and humanization. In order to meet the requirements of simulating high-voltage DC working conditions, it is necessary to conduct in-factory tests on the converter valves. If a separate water cooling system is configured for each set of converter valves, the number of water cooling systems will be too large and the background operation will be difficult.

Contents of the invention

The technical problem to be solved by the present invention is: to overcome the deficiencies of the prior art, to provide a high-voltage DC converter valve water cooling system, which has a large cooling space and can meet the heat dissipation requirements of different converter valves. Heat dissipation.

In order to solve the above-mentioned technical problems, the technical solution of the present invention is: a high-voltage DC converter valve water cooling system, which is composed of a main circulation loop, a deionization loop and a water supply branch. The room, the deionization circuit and the water supply branch are all connected through electric ball valves. The main circulation circuit includes a main circulation pump, a closed cooling tower, a main circulation filter, and an inlet valve temperature transmitter connected in sequence through pipelines. , a main circulation flow transmitter, a diverter valve group, a valve outlet temperature transmitter and a degassing tank, and an electric three-way valve is also installed between the main circulation pump and the closed cooling tower, and the diverter valve group includes A plurality of diverter valves are connected in parallel, and a diverter valve flow transmitter is installed at the inlet end of each diverter valve.

Further, in order to realize the continuous change of cooling capacity, a variable frequency fan is installed on the closed cooling tower.

Further, the inlet end of the closed cooling tower is equipped with an external cooling inlet water pressure gauge and an external cooling inlet water temperature gauge, and an external cooling return water temperature transmitter and an external cooling return water temperature transmitter are installed at the outlet end of the closed cooling tower. pressure gauge.

Further, the main circulation pump inlet is equipped with a main circulation pump inlet pressure transmitter, and the main circulation pump outlet is equipped with a main circulation pump outlet pressure gauge and a main circulation pump outlet pressure transmitter.

A specific structure of a deionization circuit is further provided. The deionization circuit is connected in parallel at both ends of the converter valve group. The deionization circuit includes an ion branch flowmeter, a buffer tank, a filter and an ion flowmeter connected in sequence through pipelines. switch.

Further, in order to detect the conductivity of the main circulation loop, conductivity transmitters are connected in parallel at both ends of the deionization loop.

Further, filter pressure gauges are installed at both ends of the filter, and an ion branch conductivity transmitter is connected in parallel at the inlet of the ion exchanger.

Further in order to control and regulate the pressure of the whole system, a buffer tank liquid level transmitter and a nitrogen pressure stabilizing system are installed on the buffer tank, and the nitrogen gas stabilizing system includes a nitrogen bottle connected through pipelines, a nitrogen branch pressure Gauge and nitrogen bypass pressure transmitter.

Further, in order to continuously adjust the replenishing water flow, the replenishing water branch includes a replenishing water tank, a replenishing water pump and a precision filter connected in sequence through pipelines, and a liquid level transmitter of the replenishing water tank is installed on the replenishing water tank.

After adopting the above technical scheme, the present invention has the following beneficial effects:

1) Multiple sets of HVDC converter valves are connected in parallel in the main circulation loop, and a converter valve flow transmitter is installed before the valves to monitor the change of the flow rate, and the flow distribution is carried out according to the cooling capacity of different converter valves, to respectively To meet their different heat dissipation requirements, it can effectively reduce the number of water cooling systems, reduce the difficulty of operation, and save costs;

2) The closed cooling tower is used as an external cooling device, and the cooling capacity can be continuously changed under the premise of meeting the maximum cooling demand through frequency conversion of the fan;

3) Connect the deionization circuit in parallel on the main circulation circuit and detect the conductivity of the main circulation circuit. The deionization circuit and the main circulation circuit are connected through an electric ball valve, which can be changed according to the main circulation flow rate and the conductivity of the main circulation circuit. Adjust the flow rate of the deionization circuit to control the conductivity of the medium in the main circulation circuit;

4) The water supply branch and the deionization circuit are connected by an electric ball valve, which can continuously adjust the water supply flow according to the conductivity of the deionization circuit and the change of the water level in the buffer tank;

5) The main circulation circuit and the closed cooling tower are connected by an electric three-way valve, which can automatically adjust the opening of the electric three-way valve according to the change of the inlet water temperature, thereby controlling the flow into the closed cooling tower to meet the large heat dissipation capacity requirements.

Description of drawings

Fig. 1 is the structural representation of the water cooling system of the HVDC converter valve of the present invention;

In the figure, 1. Main circulation pump, 2. Main circulation pump outlet pressure gauge, 3. Main circulation pump outlet pressure transmitter, 4. Electric three-way valve, 5. External cooling water inlet pressure gauge, 6. External cooling inlet Water temperature gauge, 7. Closed cooling tower, 8. External cooling return water temperature transmitter, 9. External cooling return water pressure gauge, 10. Main circulation filter, 11. Inlet valve temperature transmitter, 13. Main Circulation flow transmitter, 14. Outlet valve temperature transmitter, 15. Degassing tank, 16. Main circulation pump inlet pressure transmitter, 17. Converter valve, 18. Converter valve flow transmitter, 19. Conductivity transmitter, 20. Electric ball valve, 21. Liquid level transmitter for water supply tank, 22. Water supply tank, 23. Water supply pump, 24. Precision filter, 26. Ion exchanger, 27. Conductivity of ion branch circuit Transmitter, 28. Filter pressure gauge, 29. Ion branch flowmeter, 30. Buffer tank, 31. Buffer tank level transmitter, 33. Nitrogen bottle, 34. Nitrogen branch pressure gauge, 35. Nitrogen Branch pressure transmitter.

detailed description

In order to make the content of the present invention more clearly understood, the present invention will be further described in detail below based on specific embodiments and in conjunction with the accompanying drawings.

As shown in Figure 1, a high-voltage DC converter valve water cooling system is composed of a main circulation circuit, a deionization circuit and a water supply branch. The branch circuits are all connected through electric ball valves 20, and the main circulation circuit includes the main circulation pump 1, the closed cooling tower 7, the main circulation filter 10, the inlet valve temperature transmitter 11, and the main circulation flow transformer connected in sequence through pipelines. Transmitter 13, diverter valve group, outlet valve temperature transmitter 14 and degassing tank 15, an electric three-way valve 4 is also installed between the main circulation pump 1 and the closed cooling tower 7, and the diverter valve group includes multiple The diverter valves 17 are connected in parallel, and a diverter valve flow transmitter 18 is installed at the inlet end of each diverter valve 17 .

As shown in Figure 1, the closed cooling tower 7 is equipped with a frequency conversion fan.

As shown in Figure 1, the inlet end of the closed cooling tower 7 is equipped with an external cooling inlet water pressure gauge 5 and an external cooling inlet water temperature gauge 6, and the outlet end of the closed cooling tower 7 is equipped with an external cooling return water temperature gauge Transmitter 8 and external cooling return water pressure gauge 9.

As shown in Figure 1, a main circulation pump inlet pressure transmitter 16 is installed at the inlet of the main circulation pump 1, and a main circulation pump outlet pressure gauge 2 and a main circulation pump outlet pressure transmitter are installed at the outlet of the main circulation pump 1 3.

As shown in FIG. 1 , the deionization circuit is connected in parallel at both ends of the converter valve group. The deionization circuit includes an ion branch flow meter 29 , a buffer tank 30 , a filter and an ion exchanger 26 connected in sequence through pipelines.

As shown in FIG. 1 , a conductivity transmitter 19 is connected in parallel at both ends of the deionization circuit.

As shown in FIG. 1 , filter pressure gauges 28 are installed at both ends of the filter, and an ion branch conductivity transmitter 27 is connected in parallel at the inlet of the ion exchanger 26 .

As shown in Figure 1, a buffer tank liquid level transmitter 31 and a nitrogen pressure stabilizing system are installed on the buffer tank 30. Branch pressure transmitter 35.

As shown in FIG. 1 , the supplementary water branch includes a supplementary water tank 22 , a supplementary water pump 23 and a precision filter 24 connected in sequence through pipelines, and a water supplement tank liquid level transmitter 21 is installed on the supplementary water tank 22 .

Main circulation pump 1, electric three-way valve 4, main circulation filter 10, inlet valve temperature transmitter 11, main circulation flow transmitter 13, outlet valve temperature transmitter 14, buffer tank 30, filter, ion exchange Device 26, buffer tank liquid level transmitter 31, nitrogen cylinder 33, replenishing water pump 23 are all provided with a plurality of for standby.

In this embodiment, the external cooling device can be changed from a closed cooling tower 7 to an air cooler, which can achieve the same effect; the main circulation loop adopts a nitrogen pressure stabilizing method to control and adjust the pressure of the entire system, or a high temperature water tank can be used to stabilize the pressure. Pressure method can achieve the same effect.

In the present invention, multiple sets of high-voltage direct current transmission converter valves 17 are connected in parallel in the main circulation loop, and a converter valve flow transmitter 18 is installed to monitor the change of the flow rate before the valve enters, and the flow distribution is performed according to different cooling capacities to meet the requirements respectively. Its different heat dissipation requirements can effectively reduce the number of water cooling systems and the number of secondary protection control panel cabinets, save the test site, reduce the difficulty of operation, and save costs; the closed cooling tower 7 is used as an external cooling device, and the frequency conversion of the fan is used to meet the The continuous change of cooling capacity can be realized under the premise of the maximum cooling requirement; the deionization circuit is connected in parallel on the main circulation circuit and the conductivity of the main circulation circuit is detected, and the deionization circuit and the main circulation circuit are connected through the electric ball valve 20, which can According to the change of the main circulation flow rate and the conductivity of the main circulation loop, the flow rate of the deionization loop is adjusted, thereby controlling the conductivity of the medium in the main circulation loop; The conductivity of the deionization circuit and the change of the water level in the buffer tank 30 can continuously adjust the replenishment water flow; the main circulation circuit and the closed cooling tower 7 are connected through the electric three-way valve 4, which can automatically adjust the electric three-way valve according to the change of the inlet valve water temperature The opening of the valve 4 controls the flow into the closed cooling tower 7 to meet the requirements of large heat dissipation capacity.

The specific embodiments described above have further described the technical problems, technical solutions and beneficial effects solved by the present invention in detail. It should be understood that the above descriptions are only specific embodiments of the present invention and are not intended to limit the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims (8)

1. A high-voltage DC converter valve water cooling system, which is composed of a main circulation circuit, a deionization circuit and a water replenishment branch, and is characterized in that: between the main circulation circuit and the deionization circuit, between the deionization circuit and the replenishment water The branch circuits are all connected by electric ball valves (20), and the main circulation loop includes a main circulation pump (1), a closed cooling tower (7), a main circulation filter (10), an inlet Valve temperature transmitter (11), main circulation flow transmitter (13), commutation valve group, outlet valve temperature transmitter (14) and degassing tank (15), main circulation pump (1) and closed An electric three-way valve (4) is also installed between the cooling towers (7), and the diverter valve group includes a plurality of diverter valves (17) connected in parallel with each other, and the outlet port of each diverter valve (17) A converter valve flow transmitter (18) is installed; the closed cooling tower (7) is equipped with a frequency conversion fan. 2. The HVDC converter valve water cooling system according to claim 1, characterized in that: the inlet end of the closed cooling tower (7) is equipped with an external cooling water inlet pressure gauge (5) and an external cooling inlet The water temperature gauge (6), the outlet end of the closed cooling tower (7) is equipped with an external cooling return water temperature transmitter (8) and an external cooling return water pressure gauge (9). 3. The HVDC converter valve water cooling system according to claim 1, characterized in that: the inlet end of the main circulation pump (1) is equipped with a main circulation pump inlet pressure transmitter (16), and the main circulation pump A main circulation pump outlet pressure gauge (2) and a main circulation pump outlet pressure transmitter (3) are installed at the outlet end of the pump (1). 4. The water cooling system for HVDC converter valves according to claim 1, characterized in that: the deionization circuit is connected in parallel at both ends of the converter valve group, and the deionization circuit includes ion branches connected sequentially through pipelines Flow meter (29), buffer tank (30), filter and ion exchanger (26). 5. The water cooling system for HVDC converter valves according to claim 4, characterized in that: conductivity transmitters (19) are connected in parallel at both ends of the deionization circuit. 6. The HVDC converter valve water cooling system according to claim 4, characterized in that: filter pressure gauges (28) are installed at both ends of the filter, and the ion exchanger (26) The inlet port of the ion branch circuit conductivity transmitter (27) is connected in parallel. 7. The water cooling system for HVDC converter valve according to claim 4, characterized in that: a buffer tank liquid level transmitter (31) and a nitrogen pressure stabilizing system are installed on the buffer tank (30), the The nitrogen pressure stabilizing system described above comprises a nitrogen cylinder (33), a nitrogen branch pressure gauge (34) and a nitrogen branch pressure transmitter (35) connected through pipelines. 8. The HVDC converter valve water cooling system according to claim 1 or 6, characterized in that: the water supply branch includes a water supply tank (22), a water supply pump (23) and a precision filter connected in sequence through pipelines. device (24), the water replenishment tank (22) is equipped with a water replenishment tank liquid level transmitter (21).