1. Ability to adapt to the environment
When the motor on the bus starts in a group, when the bus is larger, the impact on the operation of the inverter is related to the input voltage fluctuation scale parameters promised by the inverter, and the inverter will not stop when the bus voltage drops by 30%.
In addition, after the instantaneous loss of bus voltage formed under the condition of bus switching, the inverter should have the function of continuous or rehabilitated operation (some manufacturers call it "loss of voltage restart function"), that is, when the bus voltage is instantaneously reduced or disappeared (such as accident switching), the inverter will not trip or make the motor system run by inertia; When the bus voltage is restored to normal, the inverter can correctly adjust its own output according to the captured motor speed, and re-drag the function of the motor to run.
2. Ability to adapt to the on-site environment
Most of the high-voltage inverters are located near the auxiliary equipment on site, and there is a lot of dust, and the dust entering the inverter cabinet will lead to the loss of insulation or breakdown and damage to electronic components; Dust blocks the filter screen and forms a power cabinet with poor heat dissipation, which can easily lead to overheating, failure and damage to the power module. Some manufacturers plan air filters to be replaceable and cleaned during operation for ease of maintenance. In the high temperature and humid climate area in the south, products with low requirements for environmental temperature and humidity and relatively low system temperature rise should be selected to ensure safe and stable operation.
3. Ability to bear their own small problems
The high-voltage inverter has the function of unit bypass, that is, when a power unit fails, the unit should be able to actively exit, and the whole system can continue to operate with faults, which is a redundant planning technology. At this moment, attention should be paid to the influence of the unit bypass on the load capacity of the inverter, and the number of power units per phase of the inverter equipment and the voltage compensation of the control system should be considered.
The more units are connected in series, the greater the probability of failure, and the smaller the impact of a single unit failure on the output ability, so the two should be compromised. If the voltage compensation algorithm and the neutral point offset algorithm are selected, the load capacity of the system unit after bypass can be improved, but this method may bring problems such as common mode voltage, and it depends on the specific situation of the equipment such as motor insulation safety.
The power supply of the control system of the high-voltage inverter is very important, and the multi-channel control power supply should be planned and selected, and the multi-channel backup and non-disturbance switching should be selected. The redundancy planning of the fan cooler also contributes to the anti-disturbance capability of the progressive system.
4. Ability to endure external problems
The impact on the operation of the high-voltage inverter caused by external faults on the input side, such as external power grid faults, when the bus voltage drops. There has been such an accident in a power plant unit in Guangdong Province: due to the instantaneous fault of the external power grid, the voltage flicker of the power bus of the plant is caused to fall, resulting in the shutdown of the auxiliary inverter. Therefore, the function of instantaneous power failure and restart should be a reliable guarantee for the improvement of the auxiliary high-voltage inverter of the power plant unit and the ability to withstand external problems.
The impact of external faults on the output side, such as cable breakdown short circuit or single-phase grounding or even phase-to-phase short circuit of the motor, on the high-voltage inverter. The high-voltage inverter should be equipped with a single-phase grounding fault detection function, according to the site conditions to select and set alarms or trip maintenance, according to statistics, the interphase short circuit problem of high-voltage motors in Guangdong Province due to insulation damage is evenly about 20 units per year, although the relative probability is small, but for the high-voltage inverter with extremely limited overcurrent ability, the impact of short-circuit current on the equipment is huge, and may lead to serious problems of equipment damage. The ability of high-voltage inverter to withstand output phase short circuit and maintenance technology are an important factor that should be considered in equipment selection and to ensure equipment safety.
5. Repair time of the equipment
Equipment faults are divided into two types: one is the instantaneous self-healing fault, once this fault appears, it can be recovered by itself in a relatively short period of time, and the inverter equipment with the function of active tracking of speed can significantly improve the operation ability and reliability in this fault situation. Some of the high-voltage inverters in operation in Guangdong Province frequently shut down when lightning strikes occur during thunderstorms, which is caused by the lack of such functions; The second is the recovery time of the equipment after the occurrence of sexual damage, and the modularization of the power unit can replace the standby module in a short time, so that the equipment can be rehabilitated and operated in a short time.
6. The impact of frequency conversion transformation on motor maintenance
High-voltage inverters are generally equipped with power frequency bypass cabinets to ensure that when the inverter is faulty or overhauled, the switching motor of the power frequency bypass cabinet can restore the power frequency operation to ensure continuous production. However, this kind of switching also brings the problem of corresponding maintenance equipment: the switch cabinet should be equipped with transformer maintenance under the state of frequency conversion operation of the motor (because the internal connection part of the inverter and the power of the plant is the input phase-shift rectifier transformer), and the motor maintenance should be installed during the power frequency operation.
Therefore, during the transformation, the maintenance of the original motor should be preserved, as the maintenance equipment during the power frequency operation, if the inverter control system does not have the maintenance function of the input transformer, from the perspective of system safety and reasonable equipment maintenance, it is necessary to install the maintenance of "isolated phase shift transformer"; When the motor is running at variable frequency, exit the motor maintenance and invest in transformer maintenance.
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