A method for optimizing the ratio of wind power and photovoltaic capacity at the distribution network end

Abstract

The invention discloses a method for optimizing the ratio of wind power and photovoltaic capacity at a distribution network end. Wind power unit capacity output; (2) Obtain the load curve of the distribution network end and the proportionally reduced load value; (3) Calculate the installed capacity of wind power at each time point and make a probability density curve to select the optimal installed capacity of wind power; (4) Calculate the installed capacity of photovoltaics at each time point and make a probability density curve to select the optimal installed capacity of photovoltaics; (5) calculate the optimal capacity ratio of wind power and photovoltaics and the optimal comprehensive output of wind power and photovoltaics; (6) adjust the optimal capacity ratio up and down , to get the optimal capacity ratio range. This method makes the total normal output of wind power and photovoltaics close to the local load curve through a reasonable capacity ratio of distributed wind power and photovoltaics, thereby reducing the pressure and cost of frequency regulation and voltage regulation of the distributed wind power photovoltaic distribution network.

Description

technical field [0001] The invention relates to the field of wind power and photovoltaic installed capacity distribution, in particular to a method for optimizing the ratio of wind power and photovoltaic capacity at a distribution network end. Background technique [0002] The rapid development of new energy is not only in areas where wind energy resources or photovoltaic resources are concentrated, but also in urban power grid areas where loads are concentrated, distributed wind power, photovoltaics and other new energy power generation industries are also developing rapidly. Although this development method can reduce the loss of transmission lines and better adapt to the distributed load demand, due to the inevitable randomness of wind power and photovoltaic itself, the distributed new energy power may be affected when it is directly connected to the urban power grid. The impact on the power grid has brought pressure on the frequency regulation and dispatch of the power g...

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Problems solved by technology

The literature "Yao Tianliang, Wu Xingquan, Li Zhiwei, et al. Research on the capacity ratio of wind and solar hybrids considering multiple constraints [J]. Power System Protection and Control, 2017, 45(9): 126-132" although many constraints have been considered Conditions, but the capacity ratio it makes is the capacity ratio of the co-construction of wind and solar farms, the main consideration is the implementation of the project, and there is no connection with the load curve

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