Unidirectional alternating-current grid-connected power generation system and method thereof

Abstract

The invention relates to the field of new energy resources and discloses a unidirectional alternating-current grid-connected power generation system and a method thereof. The method and the system are used for clean energy power generation and UPS (uninterrupted power supply) systems. A phase detector is used for detecting the phase of mains supply, a converter for converting high-voltage direct current into sine pulse direct current converts high-voltage sine pulse direct current converted from clean energy into sine pulse direct current synchronous to the phase of the mains supply, and the mains supply subjected to full-wave rectification and output current of the converter for converting high-voltage direct current into sine pulse direct current are jointed at a point A or point B and then outputted to a load, so that clean energy power generation can be realized with low cost while the problems of repeated charging, harmonic pollution, island effect and the like are avoided. Further, the open-circuit voltage of the output current of the converter for converting high-voltage direct current into sine pulse direct current is higher than the voltage of the mains supply subjected to full-wave rectification, so that clean energy resources such as solar energy and wind energy can be used preferentially.

Description

technical field [0001] The invention relates to the field of new energy, in particular to the power generation technology utilizing new energy. Background technique [0002] In 2011, the global photovoltaic demand was 26G watts, but this year the global output exceeded 30G watts. Among them, the output of photovoltaic modules in China accounts for 60-70% of the global output. However, 95% of China's output needs to be digested by foreign trade. The U.S. government has investigated the "double reverse" (anti-dumping and countervailing) of Chinese photovoltaic companies, and imposed countervailing duties of less than 5% on these products. Therefore, China's photovoltaic industry needs to gain a foothold in the domestic market in order to get out of the cold winter. Although the government has made great efforts in new energy, due to the influence of the overall economic policy regulation, it is far from being able to solve the problem if the government alone dominates a few...

AI Technical Summary

Problems solved by technology

However, since the switching of the system takes a certain amount of time, this method cannot transmit energy to the load in real time

Moreover, the use of off-grid alternating power generation systems will inevitably use large-capacity battery packs, which will lead to a sharp increase in system costs, frequent maintenance costs, and energy losses caused by battery charging and discharging, which do not meet the characteristics of the end-user market. Unable to fully promote

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