Comparison of Costs and Advantages: Marine Diesel Generators vs. Static Frequency Converters

The Static frequency converter has the advantages of environmental protection, energy saving, multi-purpose, and easy operation. It is currently the world's largest motor test power system using frequency converter technology, with an output power of 10MVA, reaching the advanced level of similar motor test systems internationally.

Compared with traditional diesel generator sets, this static frequency converter system has the following advantages:

1. Low environmental noise; And diesel generator sets have loud noise;

2. The efficiency of the Static frequency converter is very high, and it can be easily started and stopped during testing, saving energy; However, diesel generator sets consume a lot of energy, have low efficiency, and cannot be stopped casually after starting. Even if the test needs to be paused, the diesel generator set cannot be stopped, which consumes a lot of electricity; Assuming a ship is loaded with a load, a high-power generator must be used to carry it. After the load is started, the generator cannot stop working. At this time, the amount of electricity consumed by the load on the ship is actually very small, but regardless of whether the load is large or small, it still consumes the same amount of diesel. According to our understanding, there are more than ten diesel generator manufacturers. An 800k diesel generator consumes 200L of diesel per hour and 4800L per day. After starting with an 800k frequency converter, it returns to its original rated current. In this way, the power consumption of 800k will be calculated based on the rated current, which means that the amount of electricity consumed by the load is almost equivalent to the amount of mains electricity consumed.

3. The frequency adjustment range of the static frequency converter is wide, and it can operate at full load within a wide frequency range of 45Hz to 65Hz and an adjustable AC voltage range of 300-500V; The frequency regulation range of diesel generator sets is narrow, making it difficult to operate at full load within a wide frequency range of 45Hz to 65Hz and an AC voltage range of 300-500V;

4. Easy to operate, easy to start and stop, and can start and stop the system operation at any time according to the test requirements; The starting procedure of diesel generator sets is complex, and the system cannot be stopped randomly after starting;

 5. Simple daily maintenance and low maintenance workload; The daily maintenance workload of diesel generator sets is relatively large;

The wiring of the experiment is simple, the labor intensity of the testing personnel is reduced, and the work efficiency is high; The wiring of the diesel generator set test is complex, the labor intensity of the test personnel is high, and the work efficiency is low.

The frequency converter is equipped with a DC energy storage cabinet and an overvoltage rapid suppression device to suppress intermediate DC voltage fluctuations, prevent overvoltage, and ensure the safe operation of the system; Unique filter design, good filtering effect, and good output voltage waveform; -Deionized water cooling has high cooling efficiency and good cooling effect.

The price or rental product of diesel generators is higher than that of frequency converters.

Note: There are many impact loads on board, and the starting current of impact loads is 5-9 times the rated current. For example, a 150k electric motor requires an 800k diesel generator or frequency converter to carry the load.

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