Frequency modulation control method for integral wind storage system

Abstract

The invention discloses a frequency modulation control method for an integral wind storage system. According to the method, an energy storage device is connected onto the direct current bus of a converter of a wind turbine generator in parallel, the wind turbine generator and the energy storage device are taken as a whole body for supplying power for the system, an energy storage system is actively and reasonably controlled, namely the generator has the inertia response characteristic of a traditional synchronous generator while the power of the energy storage device is controlled to realize the maximum power of the wind turbine generator, the integral wind storage system has the inertia response characteristic similar to that of the traditional synchronous generator, and the primary frequency modulation of a power grid is actively participated. According to the method, the wind turbine generator has the inertia response characteristic which is the same as that of the traditional generator while the tracking control of the maximum power for the wind turbine generator is not influenced, and the primary frequency modulation of the power grid can be participated. Moreover, according to the control method, the differential signal of frequency does not need to be obtained directly in the implementation process, the noise amplification effect in the frequency signal can be inhibitedmore effectively, and finally quick recovery of system frequency is realized.

Description

Technical field: [0001] The invention relates to a frequency modulation control method for an integrated wind storage system, which is mainly used for improving the inertia response characteristics of wind turbines and the ability to actively participate in primary frequency modulation of a power grid. Background technique [0002] Due to environmental pressure, the installed capacity of new energy power generation represented by wind power has continued to expand in recent years. Due to the intermittent, fluctuating, unpredictable output, and low controllability of wind power, the power grid is facing unprecedented frequency regulation pressure. The variable-speed wind turbine is connected to the power grid through a power electronic frequency converter. The wind turbine can run at variable speed and perform maximum power tracking control (MPPT). It has high wind energy capture efficiency and active and reactive power decoupling control capabilities. However, under MPPT con...

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Problems solved by technology

However, under MPPT control, the mechanical system of the wind turbine is decoupled from the electromagnetic system, and the inertial response capability of the traditional synchronous machine is lost, which will lead to a significant reduction in the relative inertia of the power system. The displacement will increase, or even exceed the limit, which is not conducive to the stable operation of the system

In order to ensure the balance of power supply and demand and improve the stability of power supply frequency, it is necessary to equip a larger-capacity frequency modulation unit, which will undoubtedly increase the operating cost of the power grid

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