Single-ended VSC-HVDC photovoltaic power generation system

Abstract

The invention discloses a single-ended VSC-HVDC photovoltaic power generation system, which comprises more than one photovoltaic direct current booster station, an HVDC positive cable, an HVDC negative cable, an HVDC converter, a transformer and a high voltage alternating current network, the positive and negative ends of the photovoltaic direct current booster station are respectively connected with the HVDC converter via the HVDC positive cable and the HVDC negative cable, and the output end of the HVDC converter is connected with the high voltage alternating current network via the transformer. The system has the advantages of being simple and compact in structure, low in cost, easy to install and use, high in efficiency, wide in application scope and the like.

Description

technical field [0001] The invention mainly relates to the field of photovoltaic power generation equipment, in particular to a single-end VSC-HVDC photovoltaic power generation system. Background technique [0002] With the continuous aggravation of the energy crisis and the increasingly serious climate and environmental problems, the development and utilization of new energy sources is imminent. The earthquake in Japan triggered a serious leak of nuclear radiation in Fukushima, which once again caused the world to reflect on the safety of nuclear power. Germany will shut down its last nuclear power plant in 2022; China has also re-assessed the safety of its planned new nuclear power plant. [0003] Followed by photovoltaic power generation, wind power and other renewable energy has received widespread global attention. In March 2009, "Implementation Opinions on Accelerating the Application of Solar Photovoltaic Buildings" and "Interim Measures for the Management of Financ...

AI Technical Summary

Problems solved by technology

Since the existing power system mostly uses AC transmission, and photovoltaic power generation produces direct current, it is necessary to convert the direct current generated by photovoltaic power generation into alternating current through a converter. , resulting in large-scale photovoltaic power plants with a large area and low DC system voltage level (the maximum open circuit voltage is below 1000V, and the long-term working voltage is around 700V), while large-scale photovoltaic power plants mostly adopt centralized grid-connected methods (mostly 1MW is used as a photovoltaic power generation unit), which leads to the disadvantage of large DC loss in existing large-scale photovoltaic power plants

Affected by the DC voltage of the photovoltaic power generation system, the AC output voltage of the existing photovoltaic grid-connected inverters is mostly 270V and 315V, and the large-scale photovoltaic power station mostly transmits electric energy through the transmission network with a voltage level of 35kV and above, resulting in the need to go through two stages The grid-connected power transmission of the photovoltaic grid-connected inverter can only be completed in the step-up step, and the step-up transformer in each step-up step will generate losses, which reduces the overall efficiency of the photovoltaic power generation system; since the installed capacity of large-scal

Images