Voltage fluctuation adjusting method for distributed photovoltaic energy storage microgrid system

Abstract

The invention relates to the technical field of photovoltaic energy storage micro-grids and particularly relates to a voltage fluctuation adjusting method for a distributed photovoltaic energy storagemicro-grid system. The method comprises the following steps of A, firstly, respectively installing a monitoring device on an alternating current branch line of each distributed photovoltaic unit, andmonitoring the voltage and the current of the alternating current branch line in real time; B, according to the characteristics of the distributed photovoltaic units, carrying out priority division on all the distributed photovoltaic units, and determining then alternating-current linear voltage thresholds of all modes in the coordination control strategy; C, on the basis of selecting a traditional droop control strategy, introducing a voltage regulator and a virtual resistance regulator; and D, finally, building a photovoltaic microgrid simulation model, and carrying out simulation verification on the droop control strategy based on the virtual resistor. The method is advantaged in that the voltage drop of an alternating-current wire can be better reduced, circulation can be better inhibited, and the voltage fluctuation adjusting method does not need communication, and is low in cost and high in reliability.

Description

technical field [0001] The invention relates to the technical field of photovoltaic energy storage microgrid, in particular to a method for adjusting voltage fluctuations in a distributed photovoltaic energy storage microgrid system. Background technique [0002] Energy is the material guarantee for the simulation of the survival of human society. With the development of the society, the demand for fossil fuels will increase, and the large-scale use of fossil fuels will lead to serious consequences. The greenhouse effect will continue to occur, and the long-term development will lead to continuous deterioration of the environment. The demand for electricity from all walks of life has grown rapidly, and the power sector has concentrated related technologies on the construction of large-scale centralized power sources such as thermal power. However, the disadvantages of high operating costs of ultra-large-scale power systems have become increasingly prominent. Too large power ...

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Problems solved by technology

This invention greatly saves the system investment cost, and the control system is simpler and more reliable, but there are still some shortcomings. For example, there are multiple parallel converters in the microgrid, but there will be differences in equivalent impedance between the converters. phenomenon, and the unequal impedance will further lead to different output voltages of the converters, so that there is a circulating current phenomenon between the parallel converters. The generation of circulating current will affect the normal operation of the microgrid system and cause a large bus voltage Fluctuation; cannot intelligently and comprehensively detect the output voltage of each converter, and the data error is large

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