Equivalent modeling method for offshore wind power system suitable for reactive compensation

Abstract

The invention discloses an equivalent modeling method for an offshore wind power system suitable for reactive compensation. The equivalent modeling method comprises the following steps: I, grouping wind power generators in a wind power plant according to a topological structure of the offshore wind power system, wherein each group comprises at least one wind power generator; II, working out the total capacity of equivalent wind power generator sets by adopting a load flow calculation method, wherein a branch formed by multiple wind power generators of each group becomes a single-chain branch of the corresponding wind power generator set, and equivalent capacity is the sum of the capacity of all the wind power generator sets; III, performing equivalent analysis on transformers in the wind power generators of each group to obtain an equivalent multi-machine system; IV, performing the equivalent analysis on current collection systems of the multiple groups of wind power generators to obtain an equivalent multi-chain system; V, establishing a simulation model of the offshore wind power system suitable for the reactive compensation according to results obtained in the steps II, III and IV. The modeling method disclosed by the invention is simple, capable of establishing the model rapidly and better meets the requirement of practical application.

Description

technical field [0001] The invention belongs to the field of simulation of wind power generation systems, and in particular designs an equivalent modeling method for an offshore wind power system suitable for reactive power compensation. Background technique [0002] In recent years, wind power technology has developed very rapidly. However, due to the large area occupied by onshore wind farms, serious noise pollution and unstable wind speed, the current development trend of wind power is shifting from onshore wind power to offshore wind power. [0003] For the design and research of offshore wind power system, it is generally necessary to study the modeling of offshore wind farms. In terms of modeling of offshore wind farms, the current mainstream single-unit capacity of offshore wind turbines is 3-5MW. Due to the large number of wind turbines, if each wind turbine is modeled in detail, the model of the entire wind farm will be a high-level model. For the firs...

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Problems solved by technology

[0004] After searching the existing technical literature, it is found that the research on reactive power compensation of large-scale wind power grid-connected power system (Li Yaming. Research on reactive power compensation of power system of large-scale wind power grid-connected [D]. North China Electric Power University, 2012), analyzed Research on static voltage stability analysis methods, common reactive power / voltage control measures, and propose reactive power compensation strategies; research on reactive power compensation for wind power systems based on comprehensive sensitivity (Hou Yaofei, Li Guangkai, Shen Jie, et al. Wind power system based on comprehensive sensitivity Research on reactive power compensation [J]. Electric Times, 2012 (9): 62-64) put forward the voltage / active power sensitivity index, and comprehensively consider the voltage / reactive power sensitivity and voltage / active power sensitivity index to select the reactive power compensation point. And the effectiveness of the method is verified by the actual system simulation, but the modeling process of the above method is relatively complicated and cumbersome

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