Wind energy system based on superconducting energy storage-composite current limiter and working method of wind energy system

Abstract

After large-scale wind power generation is connected into an electric power system, it becomes an important problem urgently needing to be solved for the electric power system to guarantee good electric energy quality and improve power supply reliability and stability. The invention provides a wind energy system based on a superconducting energy storage-composite current limiter and a working method thereof. The system comprises a wind power plant, an alternating current bus, a superconducting energy storage system, a converter system, a composite superconducting fault current limiter, a transformer and a main power grid. The superconducting energy storage system is connected in parallel to an outlet alternating current bus of a wind power plant, and wind power grid-connected power is smoothed through the converter system. The composite superconducting fault current limiter formed by connecting resistance type superconducting fault current limiters and magnetic saturation type superconducting fault current limiters in parallel is connected in series in a power transmission line to be matched with relay protection equipment, and has a series of advantages of being high in response speed, short in recovery time after a fault, high in current limiting capacity and suitable for systems of different voltage grades. The two vacuum switches in the quick switch of the composite superconducting current limiter can realize online maintenance of the high-temperature superconducting current limiter, so that the current limiter is more practical.

Description

technical field [0001] The invention belongs to the technical field of power equipment, and particularly relates to a superconducting energy storage-hybrid current limiter for smoothing wind power grid-connected power and limiting short-circuit current during large-capacity power transmission and a working method thereof in a wind energy system. Background technique [0002] With the development of distributed generation systems, ensuring good power quality and improving power supply reliability and stability have become important issues that need to be solved urgently in the power system. Because energy storage has the characteristics of bidirectional power characteristics and flexible adjustment capabilities, configuring energy storage is the preferred solution to solve the problems of system instability caused by renewable energy power generation such as wind energy and solar energy. Among them, the advantages of fast response, high power density and independent four-quad...

AI Technical Summary

Problems solved by technology

[0003] With the continuous expansion of the scale and capacity of the power system, its short-circuit capacity is also increasing. If the short-circuit fault current cannot be effectively reduced, it is easy to damage electrical equipment, greatly reduce the load power voltage near the fault point, and even lead to system breakdown.

After wind power generation is connected to the power system on a large scale, it will have a certain impact on the fault detection and protection behavior of the system, and will change the magnitude, duration and direction of the fault current, which requires re-adjusting the parameters of the power system relay protection. In addition, it may cause protection rejection, malfunction, non-synchronous reclosing, etc., reducing the reliability of power supply

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