I. Overview The device cooling and operating environment in high-pressured applications have a direct impact on the safety of the equipment. As the power of the inverter continues to increase, the investment and operating costs of its auxiliary cooling have gradually gained the attention of the industry and customers. The use of a dedicated high-voltage variable frequency cooling system to improve equipment safety and stability, reducing the cost of auxiliary cooling system operation has become an important issue to be considered high-voltage variable frequency applications. The following to 2240kW condensation pump high-pressure inverter cooling solution, for example, several cooling methods for feasibility analysis. Second, the system analysis 1. 1.1 closed-loop air-conditioning cooling system in order to improve the stability of the application of high-voltage high-power inverter, high-voltage inverter to solve the problem of environmental heat, the current common approach is to use closed air-conditioning cooling. The method mainly provides a fixed room with heat insulation effect for the high-voltage inverter, and calculates the air-conditioning cooling capacity according to the heat of the high-voltage inverter and the area of ​​the room so as to allocate a certain amount of air-conditioners. 1.2 Equipment Scope of Supply Serial No. Device Name Model and Specification Quantity 1 Air Conditioner KF-280LW / E 4 sets 1.3 Technical Specifications No. Item Specification 1 Energy efficiency ratio 2.5 2 Rated cooling capacity (kW) 28 3 Rated input power (kW) 12 4 Power supply Specifications 3-380-50 5 Circulation air volume (m3 / h) 3200 Condensing pump high-pressured inverter indoor dimensions: length 11700mm, width 4000mm, height 3500mm. 2. Air-water cooling method 2.1 System introduction The hot air of high-voltage inverter goes into the air-cooled device through the air duct for heat exchange, and the cooling water directly takes away the heat dissipated by the high-voltage inverter; the cold air that has cooled down returns to the room. Air-cooled device through the cold water temperature is lower than 33 ℃, which can ensure that hot air through the heat sink, the indoor environment of high-voltage inverter control under 40 ℃, to meet the high-voltage inverter environmental requirements. Thus, to ensure a good indoor high-voltage inverter room operating environment. The cooling water is completely separated from the circulating air, and the water line is clearly separated from the high-voltage equipment in the outdoor of the high-voltage inverter to ensure that the high-voltage equipment room will not be exposed to security threats and accidents such as water and insulation damage. 2.2 Scope of Equipment Scope of Supply No. Equipment Name Model and Specifications Quantity 1 Air-Water Cooling System BLH-CK-105 1 set 2.3 Technical Specifications: No. Performance Parameters 1 Rated heat exchange power (kW) 50 + 55 2 Dimensions (mm) 1200 × 950 (L × W) 3 Water consumption (m3 / h) 30.1 4 Working pressure (Mpa) 0.25 ~ 0.35Mpa, 5 Working water temperature (℃) ≤33 6 Air temperature The matching principle of cooling system is calculated according to the rated power of high-voltage inverter 2240kW and the operating efficiency of 96%. The maximum cooling power of 2240kW high-voltage inverter is 2240 × 4% = 89.6kW. Because the system will all the hot air discharged from the high-voltage inverter through the air-cooled cooling device to achieve heat exchange, and then the cold air discharged back to the room, so the air circulation efficiency has been greatly improved. Wind circulation efficiency of nearly 99%. Taking into account the extreme operating conditions of the heat, and the water temperature is high, the exchange efficiency of the system and other factors, air-cooled design of the margin usually choose 1.15 to 1.2 times. Calculated with a design margin of 1.15, the heat exchange power of the air cooler is not less than 103.04 kW / unit, and the actual selected air cooler power is 105 kW. 2.5 System Installation Site High-voltage inverter room Housing indoor size requirements: length 10700mm, width 3600mm, height 3500mm. 3. Forced airtight cooling 3.1 System introduction Forced enclosed cooling system as an auxiliary device outside the high-voltage inverter power cabinet to ensure high-voltage inverter power cabinet is always in the 25-35 ℃ operating environment, greatly extending the filter replacement cycle, reduce on-site maintenance the amount. There is no need to build a separate house for a high-voltage inverter, and the transformer cabinet is open-cooled. Forced cooling unit and high-voltage inverter power cabinet integrated design, attached to the top of the power cabinet. Refrigeration compressor installed in the vicinity of high-voltage inverter. $ Div $$ 3.2 Equipment Scope of Supply Serial No. Device Name Model and Specifications Quantity 1 Forced Closed Cooling Unit BLH-CM-56 1 set 3.3 Technical Specifications No. Performance Parameters 1 Rated cooling capacity (kW) 56 2 Rated input power (kW ) 22.4 3 Working power (V) 380VAC / 3PH, 2 Road 4 Current frequency (Hz) 50Hz 5 Control temperature (℃) ≤35 6 Circulation air volume (m3 / h) 2 × 3500 3.4 Applicable occasions and principles (1) High-voltage inverter equipment rated at 1000kW and above cools itself. (2) The site installation location is limited, high voltage inverter needs to be laid out in the open space in the plant. Ambient temperature, with dust, no obvious leakage, rain characteristics of the operation occasions. (3) Installation space is small, not able to build housing indoor environment. (4) The site can provide two 380VAC / 3PH power supply. (5) Space height greater than 3.5 meters. High-voltage inverter power cabinet in front of more than 695mm space should be in order to facilitate the door open. 3.5 compulsory closed-end cooling device matching principle Forced closed cooling device according to a single high-voltage inverter power cabinet for the object of peer-to-peer configuration. Closed-loop cooling device with 2240kW inverter configuration Power = 2240 × 2% × 1.25 (design margin) = 56kW, the actual choice of 56kW closed cooling device. According to the design principle of the closed cooling device, the cooling system is limited to configure the power cabinet with higher temperature requirements. Transformer cabinet with open cooling, temperature loss to the environment; allow temperature rise 80K, high temperature alarm value 120 ℃ fully meet the requirements of operational safety. 3.6 System Installation Do not need to build a separate room, high-voltage inverter installation location can be. 4. Comparison of cooling methods No. Item Air conditioning Cooling program Air-water cooling scheme Forced closed cooling scheme 1 Inverter installed capacity 2240kW 2240kW 2240kW 2 Equipment rated cooling power 89.6kW 89.6kW 44.8kW (power cabinet only) 3 Cooling power Design capacity 112kW 105kW 56kW 4 Design margin factor 1.25 1.17 1.25 5 Number of equipment installation 4 units 1 set 1 unit 6 redundant design No power supply, air duct, equipment redundant power supply, air duct, press redundancy 7 Equipment installation needs to be arranged separately Construction and installation of integrated drive design 8 Bypass treatment No open ventilation cooling Open ventilation cooling 9 Operating costs 0.198 yuan / kW 0.024 yuan / kW 0.105 yuan / kW 10 The size of space occupied 11700mm × 4000mm 11000mm × 3600mm do not need to build a separate room 11 filter cleaning cycle 7 to 15 days 30 to 45 days 30 to 45 days 12 MTBF 7000h 50000h 20000h III Conclusion 2240kW condensation pump high-voltage inverter cooling problems Conducted a comprehensive analysis of technical feasibility, safety and reliability, economic To see: the new cooling system (air-water cooling, forced closed cooling) in the design fully take into account the equipment failure, heat exchange medium leakage, wind bypass bypass, easy operation, maintenance and other security measures, although With the new cooling system, the one-time investment of the equipment is slightly higher than that of the air-conditioning equipment, but compared with the air-conditioning cooling method, the electricity saved by running the system for 2 to 3 years usually can recover the investment. In addition, the use of forced airtight cooling program can save nearly 10 million housing costs. In summary, 2240kW condensate pump frequency conversion projects, the use of mandatory closed-end cooling solution has the advantages of land-saving, cost-effective, therefore, recommend the use of such programs for high-voltage inverter cooling.
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