Method for compensating wind power plant virtual inertia by utilizing energy accumulation device

Abstract

The invention discloses a method for compensating wind power plant virtual inertia by utilizing energy accumulation device; the method utilizing an energy accumulation device of about 5% of the rated installed capacity of the wind power plant is able to make the wind power plant generate a virtual inertia effect which is almost equal to a synchronous generator of the same capacity. The method generates active commands need to be output by the energy accumulation device by measuring the frequency bias and the frequency change rate at the outlet generatrix of the wind power plant, and processing the frequency bias and the frequency change rate with fuzzy logic. The energy accumulation device outputs power for compensating the virtual inertia of the wind power plant based on the commands. The method for compensating wind power plant virtual inertia by utilizing energy accumulation device effectively evaluates the capacity requirement of the energy accumulation device, and can be used for guide the energy accumulation configuration of the wind power plant; moreover, the structure of the controller thereof is simple, reliable and easy to be implemented, thus providing a foundation for developing a 'friendly' wind power plant, being beneficial to absorbing the large-scale wind power by the power grid, and increasing the safe and stable running level of wind power integration power system.

Description

technical field [0001] The invention belongs to the technical field of wind power generation, and more specifically relates to a method for compensating the virtual inertia of a wind farm by using an energy storage device. Background technique [0002] With the increase of grid-connected wind power capacity, the penetration rate of wind power continues to increase, which brings a series of challenges to the safe and stable operation of the power system, including frequency stability. Generally speaking, the direct coupling between the rotor speed of the conventional synchronous generator and the system frequency can directly respond to the change of the system frequency, has the function of damping the sudden change of the system frequency, and presents a certain inertia to the system. However, wind turbines controlled by frequency converters are usually completely decoupled from the system frequency, and the kinetic energy of their rotors is "hidden" by the control of frequ...

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Problems solved by technology

However, this solution is mainly aimed at achieving inertia compensation for wind turbines. For a wind farm consisting of dozens or even hundreds of wind turbines, it is necessary to coordinate and distribute the power released by the virtual inertia compensation of the wind farm among a large number of wind turbines. Reasonably arrange the speed recovery time of wind turbines and ensure the safe and stable operation of the wind turbines needs to be realized through complex information systems and inter-unit communications, which will make the scheme more complicated and less reliable

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