The capacity estimation of commonly used diesel generator sets is selected according to the long-term continuous operation output power of the units to meet the large calculation load of the whole project. According to the provisions of China's standard GB1105.1-1987 "Bench performance test method of internal combustion engines, standard environmental conditions and calibration of power, fuel consumption and oil consumption", the intercooler cools the medium in a standard environment (atmospheric pressure =100kPa, relative temperature =30%, ambient temperature =298K or 25℃. ), the diesel engine is allowed to run continuously for 15min at the rated power. However, when the environmental humidity and altitude are too high, the air density will decrease, and the supply of oxygen required for combustion will decrease when the unit is running, so the output power of the unit should be lowered accordingly. In other words, the power of the selected unit is higher than that of the load, that is, when the unit works under non-standard conditions, the power of the diesel engine should be corrected.
Under normal environment, the output power of diesel generator set running continuously is generally 0.9 times of the rated power. If the unit capacity is too small, it will not be able to drive all loads or cause sudden shutdown when starting high-power loads; If the unit capacity is too large, the investment and maintenance costs will be high, resulting in a waste of resources. Moreover, according to the characteristics of diesel engine, when it works at a small load for a long time, it will cause serious carbon deposition in engine piston rings, fuel nozzles and other places, and the cylinder wear will increase, which will damage the unit.
In the working process of diesel generator set, for resistive loads such as small and medium-sized household appliances such as light bulbs, electric stoves and ovens, and inductive loads such as large-scale electrical equipment such as machine tools and water pumps, the characteristic of resistive loads is that the resistance basically remains unchanged, but the current decreases proportionally with the voltage. Therefore, for electrical equipment with different loads, it is necessary to recalculate the capacity of diesel generator set.
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