Wind power plant low voltage riding through method based on dynamic direct current leakage resistor

Abstract

The invention provides a wind power plant low voltage riding through method based on a dynamic direct current leakage resistor. The method includes the following steps: building a wind power plant direct current grid connection model; determining the resistance of the dynamic direct current leakage resistor; setting the action protection judgment basis of the dynamic direct current leakage resistor; determining the action lasting time of the dynamic direct current leakage resistor; stopping the dynamic direct current leakage resistor after faults are removed. The method solves the technical problem in the prior art that a fan is directly and electrically connected with a fault alternating current system, and surplus wind power is consumed in a fan during the fault period. The dynamic direct current leakage resistor formed by connecting high power switching devices and dissipation resistors is arranged at the wire outlet position at the close end of the direct current end of the GAMMC to achieve smooth riding through during the fault period of the fan by means of flexible direct current grid connection. Meanwhile the dynamic direct current leakage resistor is in coordination control with the GSMMC to ensure that the output power of the wind power plant is recovered quickly after the faults are removed, and the recovery rate is far larger than the relevant technical index of the standard in the power system industry.

Description

technical field [0001] The invention belongs to the technical field of power electronics, and in particular relates to a low-voltage ride-through method of a wind farm based on a dynamic DC energy release resistor. Background technique [0002] With the increasing requirements of the global response to climate change, the increasingly severe energy shortage and energy supply security situation, the status of renewable energy in the energy strategies of various countries is constantly improving because of its clean, safe and sustainable characteristics. Among many renewable energy power generation methods, wind power has developed rapidly and has begun to play an increasingly important role in energy supply due to its advantages such as low cost, mature technology, and high reliability. From 2005 to 2010, the average annual growth rate of global cumulative wind power installed capacity was 27%, and 83 countries have realized the commercial development of wind power. In 2011,...

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Problems solved by technology

[0004] Aiming at the technical problems that the rotor excitation adjustment and other ride-through schemes in the prior art do not overcome the technical problems of direct electrical connection between the wind turbine and the faulty AC system, and the excess wind power consumption inside the wind turbine during the fault period, the present invention provides a wind farm based on a dynamic DC energy discharge resistor Low-voltage ride-through method, through flexible DC grid connection and a dynamic DC energy-dissipating resistor connected in series with a high-power switching device and a dissipation resistor at the near-end outlet of the GSMMC's DC terminal, to achieve smooth ride-through during fan failures, and at the same time dynamically Coordinated control of the DC scoop resistance and GSMMC will ensure that the output power of the wind farm recovers quickly after the fault is cleared, and the recovery rate is much faster than the relevant technical indicators of the power system industry standard

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