Wind-power trend optimizing system based on fast energy storage and control method thereof

Abstract

A wind-power trend optimizing system based on fast energy storage and a control method thereof belong to the technical field of wind-power power adjustment control in the new energy power generation technology. The wind-power trend optimizing system based on fast energy storage comprises a storage battery pack (1), a direct current power adjustment system (2), a super-capacitor group (3) and an alternating current and direct current power adjustment system (4). The direct current power adjustment system (2) adopts a plurality of groups of shunt-wound bidirectional Buck-Boost current transformation topologies, the storage battery pack (1) is located on the low voltage side of the direct current power adjustment system (2), the super-capacitor group (3) is located on the high voltage side of the direct current power adjustment system (2), and an energy storage link is connected with a public power grid through the alternating current and direct current power adjustment system (4). The control method of the wind-power trend optimizing system based on fast energy storage comprises an energy storage power distribution control method and a trend optimizing control method, and relates to an energy storage component charging state system on a chip (SOC) zone division method and dynamic adjustment rules of energy flow between the system and the power grid. The wind-power trend optimizing system based on fast energy storage and the control method thereof can improve power grid electric energy quality and stability and safety of the system.

Description

Technical field [0001] A control method of a wind power flow optimization system based on fast energy storage belongs to the technical field of wind power regulation and control in new energy power generation technology. Background technique [0002] As an energy source, the biggest shortcomings of wind energy are its instability, discontinuity and uncontrollability. After the grid-connected wind turbines reach a certain degree of penetration, the fluctuation of their output power will cause frequent changes in the size and direction of the grid power flow. Causes the fluctuation, flicker and frequency instability of the grid voltage. In addition, since most wind turbines need to be connected to the system through power conversion devices, these power conversion devices will bring more harmonic pollution to the grid while controlling the active and reactive power of the generators. When a wind power system with a certain penetration capacity encounters disturbances such as power...

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Problems solved by technology

[0002] As an energy source, the biggest defect of wind energy lies in its instability, discontinuity and uncontrollability. After the grid-connected wind turbines reach a certain degree of penetration, the fluctuation of their output power will lead to frequent changes in the magnitude and direction of the power grid tidal current. Cause grid voltage fluctuations, flicker and frequency instability

In addition, since most wind turbines need to be connected to the system through power conversion devices, these power conversion devices will bring more harmonic pollution to the grid while controlling the active and reactive power of the units

When a wind power system with a certain infiltration capacity encounters disturbances such as sudden changes in power generation units or loads, system failures or structural changes, and grid-connected or off-grid processes, it will cause serious stability and power quality problems to itself or the public grid.

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