Centralized cooling technology for high-voltage inverters

The high-voltage inverter equipment has a large power, and 4% of the power loss is mainly lost in the operating environment in the form of heat. If the working environment temperature problem of the inverter room cannot be solved in time and effectively, the operation safety of the inverter body will be directly endangered; finally, the temperature overheating will cause the inverter overheat protection action to trip. In order to ensure that the inverter has a good operating environment, measures must be taken for the temperature control of the inverter and the operating environment.

Second, the cooling method

Through the accumulation of experience in inverter engineering application, a complete inverter cooling system solution is provided on-site for different application environments. Commonly used cooling methods mainly include: (1) air duct open cooling; (2) air conditioning closed cooling; (3) air-water cooling closed cooling; (4) equipment body water cooling; (5) combined cooling in the above manner.

Air duct open cooling

1.1 Cooling process

The cold air enters the frequency converter through the ventilation inlet filter of the frequency conversion room. After cooling the body, the hot air is discharged from the air outlet of the frequency converter.

1.2 Installation method

The open air cooling installation of the air duct is relatively simple. Just open two ventilation inlets on the wall of the frequency conversion room, install the filter screen, and then pull out the air outlet air duct on the cabinet top windshield of the inverter, as shown in Figure 1 below. Shown as follows:

figure 1

1.3 System Features

(1) Simple construction and large maintenance; (2) Low cost; (3) Operational stability depends on the local environment.

2. Air conditioning closed cooling

2.1 Capacity selection principle

Select the capacity of the air conditioner according to the heat generated by the inverter and the available area of ​​the control room environment.

2.2 Installation method

When installing the air conditioner in the inverter room, it is required that the space of the inverter control room should be as small as possible and sealed to avoid the heating effect caused by the high outdoor temperature in summer. The installation position of the air conditioner can be arranged on both sides of the inverter according to the actual situation on site. The specific equipment layout is shown in Figure 2.

figure 2

2.3 System Features

(1) Rapid and efficient cooling; (2) Child lock function to prevent misoperation; (3) Wide angle air supply, uniform and comfortable room temperature; (4) Anti-cold wind design, comfortable air supply; (5) Independent dehumidification; (6) Low temperature , low voltage start; (7) outdoor unit with high temperature operation; (8) indoor closed cooling;

(9) The cooling power is left with a margin.

3. Air-water cooled closed cooling

3.1 Basic principles

The air-water cooling system is a cooling system that utilizes high efficiency, environmental protection and energy saving, and its application technology is in a leading position in China. Its shape and principle are shown in Figure 3:

image 3

The hot air coming out of the frequency converter is connected to the radiator with the fixed water-cooled tube through the air duct. The radiator passes through the cold water with a temperature lower than 33 °C. After the hot air passes through the heat sink, the heat is transferred to the cold water and becomes cold air. The heat sink is blown out, and the heat is taken away by the circulating cooling water to ensure that the ambient temperature in the inverter control room is not higher than 40 °C.

Installation of the air cooler requires that the space in the equipment be kept as small as possible in a confined environment. The water flowing into the air cooler is industrial circulating water. To protect the equipment, the PH value of the circulating water is required to be neutral, and there is no corrosion to damage the impurities of copper and iron. The water pressure of the influent water is generally 0.2-0.3Mpa, and the inlet water temperature is ≤33. °C.

The maintenance of the air cooler is simple and easy, and it is usually maintained once a year for cooling pipe flushing.

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