Novel energy-storing type hydraulic wind generating set frequency regulation control system and method

Abstract

The invention discloses a novel energy-storing type hydraulic wind generating set frequency regulation control system and method. The system includes four parts including a wind turbine part, a hydraulic transmission part, a hydraulic energy storage subsystem part and a power generation part. When load fluctuations cause grid frequency fluctuations, a wind turbine controls active power output by the system by controlling the pitch angle of a variable pitch system of the wind turbine part, the variable motor swing angle of the hydraulic transmission part and the variable pump / motor swing angleof the hydraulic energy storage subsystem part, and then the frequency output by a power generator is further controlled. The principle of coordinating the active power is that variable pump / motor swing angle control is prioritized, and then the variable motor swing angle is regulated and controlled to adjust power input into the power generator; and by regulating and controlling the variable motor swing angle, the pitch angle of the variable pitch system is also controlled, input of system energy is changed, and the frequency of the power generation system is stabilized.

Description

technical field [0001] The invention relates to wind power generation technology, in particular to a novel frequency modulation control system and control method of an energy storage hydraulic type wind power generating set. Background technique [0002] With the increasing environmental and energy problems, wind power generation has attracted more and more attention at home and abroad, and the wind power industry has also developed rapidly. [0003] As a new type of wind power generation device, the hydraulic wind turbine adopts a fixed-quantity pump-variable motor closed-type hydraulic transmission system to effectively cooperate with the excitation synchronous generator. Compared with the gearbox-type and direct-drive wind turbines, this unit Effectively reduce the weight of the engine room, reduce the impact on the power grid, and improve the quality of power generation. [0004] In order to strengthen the proportion of wind turbines in the power grid and improve the fr...

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Problems solved by technology

[0006] At present, for the frequency modulation control technology of wind turbines, Chinese patent CN107781111A proposes an energy storage type hydraulic wind turbine primary frequency modulation system and control method. The system controls the energy of the accumulator by adjusting the displacement of the variable pump / motor. Storage and storage to achieve frequency modulation control, this method can replenish and absorb power in time, and can effectively maintain frequency stability, but this method still stays in the first frequency modulation stage and cannot achieve zero-difference frequency modulation, and the variable is single and inflexible

[0007] At present, there are few researches on the frequency modulation control methods of hydraulic wind turbines, while the frequency modulation control methods of traditional generators mostly rely on power electronic equipment, namely converters and large moment of inertia equipment, which increases the cost and weight of wind turbines on the one hand. , on the other hand, once there is a problem with the power electronic equipment, the frequency can no longer be adjusted

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