Low voltage grid-connected detection device and method of distributed new energy power generation system

Abstract

The invention relates to a low voltage grid-connected detection device and method of a distributed new energy power generation system. The low voltage grid-connected detection device comprises a signal gathering module, a signal modulation module, a master control module, a wireless communication module and a grid-connected control module. The signal gathering module comprises six alternating voltage transformers, three alternating current transformers and a direct voltage transformer. The signal modulation module comprises a three-phase filter circuit, a three-phase voltage modulation circuit, a three-phase current modulation circuit and a zero cross detection circuit. The master control module comprises a comparator and a DSP processor, wherein the comparator comprises a voltage comparator, a phase angle comparator and a frequency comparator. A new energy power generation system grid-connected rank function is built by a multiple linear regression model, the new energy power generation system grid-connected rank function synthesizes eight parameters relative to the quality of electric energy, and therefore obtained rating results are more accurate and comprehensive. According to the low voltage grid-connected detection device and method, detection results are uploaded to a power grid dispatching center by the wireless communication module in time, the plug-and-play characteristic is achieved, and the grid-connected rate of the distributed new energy power generation system is improved.

Description

technical field [0001] The invention belongs to the field of new energy power generation and the field of electrical technology, and specifically relates to a low-voltage grid-connected detection device and method for a distributed new energy power generation system. Background technique [0002] Environmental issues have attracted unprecedented attention from all countries in the world. It is generally believed that improving energy efficiency and renewable energy utilization efficiency and reducing greenhouse gas emissions are inevitable trends in the future development of power grids. New energy has the advantages of being clean, pollution-free, practical, inexhaustible and inexhaustible. With the reduction of world energy, new energy power generation technology has been continuously developed. Among new energy sources, photovoltaic power generation and wind power generation are developing fastest, and all countries in the world regard them as important development direc...

AI Technical Summary

Problems solved by technology

However, new energy power generation has the characteristics of intermittent, random, and poor dispatchability. In the case of insufficient power grid capacity, large-scale new energy power generation grid integration will bring some adverse effects to the power system, and the power grid must control the access capacity. Within the controllable range, in order to minimize the adverse effects, in order to ensure the reliability of new energy access, and to allocate the proportion of each new energy in the generated electric energy, a distributed new energy generation system It is very important to constantly detect and control the device

[0003] At present, the new energy grid-connected system is still in its infancy, and everyone adopts different grid-connected methods according to the characteristics of different new energy sources. The unified management of this dispatch center has become a great difficulty

Therefore, it is necessary to standardize the configuration of the new energy grid-connected system structure to overcome the shortcomings of the previous new energy grid-connected procedures, which are complicated, cumbersome and time-consuming.

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