A two-layer voltage optimization method for low-speed decentralized wind power integration into distribution network

Abstract

The invention relates to a double-layer voltage optimization method for integrating low-speed distributed wind power into distribution network, comprising the following steps: 1) constructing a double-layer voltage optimization model according to a model of a low-speed wind turbine generator system and a SVC; 2) In the upper layer model, the multi-objective programming problem of low-speed wind turbine location is solved, and the optimal type and location of low-speed wind turbine are obtained. After the location of low-speed wind turbine is selected, Q-V-curve method is adopted to determine the optimal access location of SVC; 3) The optimal type, access position and optimal access position of SVC of low-speed wind turbine in the upper layer model are transferred to the lower layer model,and the reactive power control method of coordinated voltage regulation between DFIG and SVC based on fuzzy logic is established, so that the parallel voltage of wind turbine can be raised to the range of continuous operation. Compared with the prior art, the invention has the advantages of considering low wind speed, load fluctuation and user behavior characteristics of the load of the distribution network, improving the overall voltage distribution of the distribution network and the like.

Description

technical field [0001] The invention relates to the field of optimal control of low-wind-speed wind turbines, in particular to a double-layer voltage optimization method for integrating low-wind-speed distributed wind power into a distribution network. Background technique [0002] 2018 is recognized as "the first year of distributed wind power", and the National Energy Administration vigorously promotes the development of distributed wind power and low-wind-speed wind power. At the same time, the construction of a "world-class distribution network" also requires a large number of distributed energy sources to be connected, and can realize intelligent and automatic operation. Therefore, the requirements of the distribution network for the quality of wind farm output power, energy saving and loss reduction are increasing day by day. Reasonable planning of access location and capacity of decentralized wind power, improvement of power quality at access points, and power control...

AI Technical Summary

Problems solved by technology

On the one hand, in the selection and location of wind turbines, some scholars have proposed that wind turbines be incorporated at the end of the radioactive distribution network to support the voltage level at the end. However, such a "voltage leverage effect" does not maximize the overall In addition, the operating characteristics of low-wind-speed wind turbines are different from conventional wind turbines. Before connecting to the distribution network for voltage operation optimization, the appropriate wind turbine type and grid connection point should be determined first; another On the one hand, in terms of operation control after wind turbines are connected to the grid, since distributed wind farms do not build new substations and reactive power compensation equipment in principle, the reactive power of the wind turbines must be used first. When the wind speed is low and the load is heavy In this case, the DFIG reactive power reaches the limit but still cannot make the PCC point voltage reach the ideal range. Therefore, when the reactive power consumption is exhausted, it is necessary to coordinate the voltage regulation with the reactive power compensation device.

Images