Novel grid-connection control system for small gas generator set

Abstract

The invention discloses a distributed power supply grid-connection control system of a novel grid-connection control system for a small gas generator set. The distributed power supply grid-connection control system has the functions of automatic grid connection, automatic protection and islanding prevention and is simple in structure, accurate in control, reliable and durable.

Description

technical field [0001] A distributed power grid-connected control system is mainly suitable for distributed power sources powered by small gas engines. Background technique [0002] China's distributed power grid access technology regulations, 5KW ~ 200KW distributed power grid access technical standards are exactly the same, the functional structure of the grid-connected system is naturally the same, in the case of the same functional structure, large and small electrical equipment is different from large and small machinery Equipment has a large cost difference; for example, internal combustion engines with the same structure, same function, same quality, and different power (5kw~200kw), their cost can vary many times, while the same structure, same function, same quality, different power (5kw~200kw) grid-connected cabinets, the maximum difference in their cost will not exceed double; therefore, compared with high-power (200kw) distributed power, the cost of low-power (20k...

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Problems solved by technology

[0005] Compared with the existing technology, this system does not directly measure the electric frequency of the grid-connected point to realize over-frequency and under-frequency control and protection, but realizes the over-frequency, under-frequency and anti-islanding automatic protection functions through indirect measurement of the generator speed. Complex problems, not only reduces costs, but also improves detection accuracy and control reliability

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