Diesel generator set units match

Ensure the unit to achieve the various technical indicators, unit design and manufacturing diesel engines and generators must make a good match, which includes the power and speed. Diesel power diesel engine can achieve effective power to rated speed for 12 hours of normal operation. The power of the synchronous generator is rated power at rated speed, long-term continuous operation on the output terminal. Usually diesel engine rated power (hp) synchronous generator rated power (kW) is called match ratio. The general requirements in the unit used in the plains to the matching ratio was 1.6:1; for mobile power plants require a higher match than take 2:1. Speed ​​matching requirements are very strict. Have a close relationship between the speed and the unit of power, frequency, voltage, thus requiring the matching of the diesel engine and generator must have good performance and reliable work of the governor to ensure that in a relatively short period of time the generator to It’s rated speed and stable operation, but also be able to meet the load requirements on the governor changes.
The unit operating diesel generator sets can be a single unit operation can also be multiple parallel operation and incorporated into the power system operation. Single unit run by many constraints: its power to meet the requirements of the overloaded conditions, light load operation will reduce the unit running economy, and the standby unit, also with the running capacity of the units. Parallel operation of multiple units and the grid to run the expansion of supply capacity and improve reliability of electricity supply, a standby unit to the relative reduction in the capacity of the standby unit. To achieve parallel operation must meet the following four conditions: ① terminal voltage equal; ② the same frequency; the ③ phase; ④ phase sequence consistent. Also, run protection devices, can automatically rational allocation and adjustment of active power and reactive power, the unit between the FM characteristics and surge characteristics curve tends to close.
Characteristics diesel generator compared with the turbine generator has the following characteristics: the ① per unit of output of the small size, light weight, simple system, and more generally the overall facilities. Therefore, the speed of the diesel power station construction. ② diesel power generation, thermal efficiency, part load or light load, the fuel consumption per unit of output changed little. 3 diesel generator sets, starting with a load and shutdown time is shorter, it can start at any time, is more suitable for the emergency power supply. (4) diesel generator set operation and maintenance than the turbine generator is simple and convenient. Diesel generator set, however, also has some disadvantages: (1) only use liquid fuel, fuel prices, more expensive, so the higher energy costs. ② diesel engine wear, life expectancy is shorter, more frequent maintenance. Run stability and overload capacity steam power plant. ③ running unit vibration and noise, workers in poor operating conditions. ④ generator pole surface must be equipped with a brake coil, in order to facilitate the unit starts and stops.