A Phase Synchronization Method for Parallel Operation of Multiple Generating Sets

Abstract

In order to solve the problem of low reliability of parallel operation of generator sets in the prior art, the present invention provides a phase synchronization method for parallel operation of multiple generator sets. The generator set includes an engine generator, a rectifier unit, an inverter unit and an output filter. It also includes a main control unit and a throttle control unit; it also includes a current sampling unit, a voltage sampling unit and a voltage zero-crossing unit, and the output ends of the output filtering unit are respectively connected with the current sampling unit, the voltage sampling unit and the voltage zero-crossing unit. In this application, the actual output current of the generator set, the value of the output voltage, and the time difference between the actual zero-crossing point of the output voltage and the software zero-crossing point are collected, and compared with the preset value in the main control unit of the generator set, the period of the output voltage is adjusted. The value and voltage amplitude, the phase of synchronous output voltage, the power distribution of different units in parallel, improve the reliability of parallel operation of generator sets, and improve the efficiency and economy of unit operation.

Description

technical field [0001] The invention relates to the technical field of voltage and frequency control for power generation by generator sets, in particular to a phase synchronization method for parallel operation of multiple generator sets. Background technique [0002] Commonly used generator sets use the internal combustion engine as the prime mover, and the operation of the internal combustion engine drives the generator to generate electricity. Due to the structural limitations of the internal combustion engine or generator itself, the output power of a single generator set does not match the power required by the load; for example, the output power of a single generator set The output power is 1.5kW, but the power required by the load is 7kW, so it is necessary to connect multiple generator sets in parallel to provide power for the load. In this application, multiple generator sets include two or more than two generator sets. [0003] At present, the parallel function of...

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Problems solved by technology

[0007] In order to solve the problem of low reliability of generator sets running in parallel in the prior art, the present invention provides a phase synchronization method for parallel operation of multiple generator sets, the purpose of which is to achieve phase synchronization and power synchronization among multiple parallel generator sets. Balanced, during phase synchronization, it is only necessary to detect the time difference between the actual zero-crossing point of the output voltage and the software zero-crossing point, which can be realized through simple calculations, improving the reliability of parallel operation of generator sets, and improving the efficiency and economy of unit operation

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