Power generation system capable of realizing parallel operation of multiple wind generation sets as well as power control system and method

Abstract

The invention discloses a power generation system capable of realizing parallel operation of multiple wind generation sets as well as a power control system and method, and belongs to the field of wind generation sets. The multiple wind generation sets comprise M wind generation sets which are connected to the same variable-frequency alternating-current bus and perform parallel operation, and alsocomprise a machine side converter, a real-time wind speed acquisition module, a maximum wind energy output controller, a machine side controller and a variable-pitch controller, wherein the machine side converter is connected with the variable-frequency bus; the real-time wind speed acquisition module is used for acquiring real-time wind speed of the M wind generation sets; the maximum wind energy output controller is connected with the real-time wind speed acquisition module and is used for calculating the same wind machine group rotating speed omega-opt capable of acquiring best wind energyoutput according to the real-time wind speed; the machine side controller is used for controlling the machine side converter according to the best same rotating speed omega-opt to realize variable-speed power generation of the M wind generation sets; and the variable-pitch controller is used for outputting a pitch angel control value of each wind machine, so that the generated power of each windgeneration set does not exceed a rated power value. Wind energy loss in the parallel operation process of the wind machines can be reduced and the fact that the output power of each wind generation set exceeds the rated value is avoided.

Description

technical field [0001] The invention relates to the field of wind power generation, in particular to a power generation system, a power control system and a method for parallel operation of multiple wind turbines. Background technique [0002] Offshore wind power has the advantages of high wind speed, low turbulence intensity, and stable wind speed and direction, and is the main trend of the development of the wind power industry. If multiple wind turbines are operated in parallel instead of single-machine discrete control, it will help reduce the failure rate, thereby reducing offshore maintenance work, increasing effective power generation time, and reducing the total system cost. However, when there is a difference in wind speed at the wind turbines connected to the same variable frequency AC bus, this will result in a certain loss of wind energy. For wind turbines with too high wind speed, the output power will easily exceed the rated value. How to calculate in real time...

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Problems solved by technology

However, when there is a difference in wind speed at the wind turbines connected to the same variable frequency AC bus, this will result in a certain loss of wind energy. For wind turbines with too high wind speed, the output power will easily exceed the rated value. How to calculate in real time and quickly according to the change of wind speed The operating speed of the wind turbines, reducing the wind energy loss during the system control process, and effectively controlling the output power of each wind turbine to not exceed the rated value in real time are problems that need to be further resolved.

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