Wind turbine generator low voltage ride through (LVRT) coordination control method applying static synchronous series compensator (SSSC)

Abstract

The invention discloses a wind turbine generator low voltage ride through (LVRT) coordination control method applying static synchronous series compensator (SSSC) According to the SSSC access point voltage level monitored in real time, the operation states of the SSSC and the doubly-fed fan are divided into three operation modes of normal operation, mild voltage drop operation and severe voltage drop operation. In the normal operation mode, the doubly-fed fan recovers dropped voltage through the ability of the doubly-fed fan; in the mild voltage drop operation mode, only a rotor crowbar circuit is adopted to improve the LVRT capability; and in the severe voltage drop operation mode, the SSSC adopts an additional control strategy to reduce the voltage drop depth, and is matched with the crowbar circuit to make up the shortages when the SSSC and the crowbar circuit act independently, so that the LVRT capability of the SSSC is better improved. By dividing the operation modes of the system, the non-off-grid capability of the doubly-fed wind power plant during voltage drop is effectively and quickly improved, and the method is an LVRT implementation scheme capable of dealing with the voltage drop during the power grid fault.

Description

technical field [0001] The invention relates to a low-voltage ride-through coordinated control method of a wind turbine using a static synchronous series compensator (Static Synchronous Series Compensator, SSSC), which belongs to the technical field of wind power generation. The proposed coordinated control method can flexibly switch the control mode when the system fails or the voltage drops at the grid-connected point of the wind turbine, so as to improve the low-voltage ride-through capability of the wind farm. Background technique [0002] In recent years, my country's wind power has developed rapidly, and its penetration rate in the power grid has increased rapidly, becoming the third largest energy source after thermal power and hydropower. Due to the reverse distribution of wind resources and loads in my country, that is, the wind resources in the "three north" regions are relatively sufficient, while the demand for loads in the southeast coastal areas is relatively l...

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Problems solved by technology

There are many literatures on the application of SSSC to control power flow, reactive power compensation and solve the problem of

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