Generator parallel operation system serving as standby power supply and method for selecting bus capacity of generator parallel operation system

Abstract

The invention discloses a generator parallel operation system serving as a standby power supply. The system comprises at least two generators, wherein each generator has a controller which controls the generator to operate and has a phase detection function; and each generator is connected with a corresponding low distribution system through an output switch of each generator. The system is characterized in that: each generator correspondingly has a parallel operation switch; the generator parallel operation system also comprises a main bus; one end of the parallel operation switch is connected with the bus, and the other end of the parallel operation switch is connected between the corresponding output switch and the corresponding low distribution system of each generator; the controllers are electrically connected with the corresponding parallel operation switches; and during failure of one or more generators, other controllers synchronize the phase of the bus and then control the corresponding parallel operation switches to be switched on and switched off. The generator parallel operation system has the advantages that: the configuration quantity of generator sets is not increased during the implementation of redundancy backup of the generator sets; cost can be effectively saved; and power supply reliability can be improved.

Description

technical field [0001] The invention relates to the field of backup fixed generator sets, in particular to a generator parallel system for backup power supply and a method for selecting the busbar capacity of the system. Background technique [0002] Existing large-scale power consumption sites are usually powered by mains power. When there is a primary or secondary important load, the generator is usually used as a backup power supply. normal operation. A large-scale power consumption site usually includes multiple low-voltage power distribution systems. The early generator systems for backup power use a 1+1 method, that is, a low-voltage power distribution system corresponds to one main generator and one backup generator. , when the mains power supply fails, start the main generator to supply power, only when the main generator also fails at the same time, start the backup generator to supply power, the number of the main generator and the backup generator is equal , suc...

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Problems solved by technology

[0003] As an improvement of the above system, people invented a scheme of N main generators + 1 mobile backup generator. When one of the main generators fails, the mobile backup generator will be manually moved to this station. The main generator works nearby instead of it. This system requires a mobile backup generator and corresponding accommodation space, and it is inconvenient to operate.

[0004] For this reason, Chinese patent ZL200820167881.6 "Modular configuration device for low-voltage power distribution system" discloses a fixed N+1 solution, that is, N main generators and N low-voltage power distribution systems are used for 1-to-1 power supply , specially set up a backup generator whose output can supply power to any low-voltage distribution system. When any main generator fails, the backup generator will start to serve as the corresponding low-voltage distribution system The power supply of the system is better than the previous systems, but for N low-voltage power distribution systems, at least one backup generator is still required, and when the number of N is large, in order to ensure the safety of power supply, the number of backup generators also needs to be corresponding increase, so such a system is also not conducive to cost savings

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