Intelligent start-up method for output stage of distributed generation grid-connected converter test device

Abstract

The invention discloses an intelligent starting method aiming at an output stage of a testing device for a distributed generation grid-connected inverter; the intelligent starting method aims at providing necessary preparatory work for normal operation of the testing device for the distributed generation grid-connected inverter at air temperature and a special environment. The intelligent starting method disclosed by the invention comprises the following steps of performing sensor fluctuating automatic correction, performing feedback channel gain automatic correction and starting closed-loop control at lowest frequency required by a system so as to obtain the largest effective value computing window, thus, a guarantee is provided for changing output voltage frequency on line. According to the intelligent starting method disclosed by the invention, a sensor fluctuating automatic correction algorithm and a feedback channel gain automatic correction algorithm are started in sequence according to a time sequence, and the closed-loop control is started at the lowest frequency required by the system, and therefore the goal that system parameters are corrected is achieved, and the normal operation of the system is ensured; the intelligent starting method disclosed by the invention has the characteristics of being clear in logic, simple and easy in operation, high in correction precision, and the like, has a practical application value, and is especially suitable for practical industrial application occasions.

Description

technical field [0001] The invention belongs to the field of new energy technology, and in particular relates to an intelligent start-up method for the output stage of a distributed power generation grid-connected converter test device, in order to ensure that the distributed power generation grid-connected converter test device works under special temperature and special environment Normal operation provides the necessary preparations. Background technique [0002] With the development of photovoltaic power grid-connected technology, wind power grid-connected technology and fuel cells and other new energy technologies, the proportion of renewable energy power generation in global power generation components is increasing day by day. With the surge of distributed generation based on renewable energy in the power industry, the stability issue of distributed generation systems has become more and more prominent, especially when distributed generation systems are in grid-connec...

AI Technical Summary

Problems solved by technology

However, since distributed power generation systems are generally located in places with harsh climates, such as cold northern wind farms, or high-temperature desert photovoltaic farms, etc., voltage sensors are very vulnerable to extreme temperatures, humid climates and dry climates. , causing the zero drift value of the voltage sensor to be too large, which will bring problems to the closed-loop control system; at the same time, since the distributed generation grid-connected converter test device often tests high-voltage and high-power distributed generation occasions, the sampling channel The gain will be relatively large, which leads to a slight change in the sampling channel, which will cause a huge change in the final output voltage; coupled with the window length of the sliding window RMS closed-loop feedback control, it is necessary to adjust the distribution The intelligent start-up link is added to the start-up process of the output stage of the grid-connected converter test device for distributed power generation to provide necessary preparations to ensure the normal operation of the test device for distributed power generation grid-connected converter under special temperature and special environment

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