Wind power plant group distributed voltage coordination control method and system

Abstract

The invention provides a wind power plant group distributed voltage coordination control method and system, and belongs to the technical field of wind power plant control, and the method comprises thesteps: obtaining the data of each wind power plant in a wind power cluster region, which at least comprises the state information of a current moment, the reference voltage of each wind power plant grid-connected point and the reference voltage of a public grid-connected point; performing double-layer control, and enabling the first-layer control to obtain the optimal control quantity of capacitance switching, inductance switching and on-load tap-changer change according to the obtained wind power plant data and a first random prediction control model; enabling the second layer of control toobtain the reactive output variable quantity of each fan of each wind power plant according to the obtained wind power plant data and a second random prediction control model, and performing distributed coordination optimization among the wind power plants according to an alternating direction multiplier method to obtain the optimal reactive output control quantity of each fan in each wind power plant. The expandability of the wind power plant controller is improved, and the wind power plant controller has better flexibility and robustness.

Description

technical field [0001] The present disclosure relates to the technical field of wind farm control, in particular to a distributed voltage coordinated control method and system for a wind farm group. Background technique [0002] The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art. [0003] The distribution of wind resources in my country is uneven. A large number of large-scale wind farms are far away from the load center and connected to the end of the power grid. They have a weak connection with the power grid and lack strong and effective support from the power grid. With the continuous expansion of wind power grid-connected scale, the uncertainty and volatility of wind energy seriously affect the grid-connected voltage of wind farms. Smooth voltage fluctuations caused by wind speed fluctuations. [0004] At present, the research on reactive power and voltage control of wind ...

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Problems solved by technology

[0005] The inventors of the present disclosure found that the global optimization control strategy is an effective way to achieve coordination among wind farms and meet voltage control requirements; however, the existing global control method has a long control period and cannot cope with the impact of short-term wind power fluctuations on voltage ; With the continuous growth of wind power installed capacity, the computing burden of the central controller has increased sharply; the control performance is heavily dependent on the performance and reliability of the communication system and the central controller, which lacks sufficient robustness and flexibility; existing centralized control The strategy may not be suitable for real-time and coordinated control among dozens or even hundreds of wind farms in the future

[0006] In addition, wind power output is uncertain, and the existing MPC-based wind farm voltage control largely relies on the accuracy of wind power forecast information, and does not fully consider the risk of voltage over-limit caused by wind power forecast errors. Although MPC has a certain robustness to prediction errors, with the increase of prediction errors, it is easy to cause large deviations or over-limits in voltage control, so MPC cannot completely deal with wind power uncertainties

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