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LOW VOLTAGE RIDE-THROUGH CONTROL METHOD FOR GRID-CONNECTED CONVERTER OF DISTRIBUTED ENERGY RESOURCES
LOW VOLTAGE RIDE-THROUGH CONTROL METHOD FOR GRID-CONNECTED CONVERTER OF DISTRIBUTED ENERGY RESOURCES
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机译：分布式能源并网换流器低压穿越控制方法
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摘要
An LVRT control method for a grid-connected converter of distributed energy resources comprises steps of: obtain a positive sequence electrical component and a negative sequence electrical component during an LVRT period; outputting a compensation signal according to a power threshold withstood by a grid-connected converter to undertake reactive power compensation; and constraining the output power lower than the power threshold. The present invention uses the positive and negative sequence electrical components to undertake reactive power compensation, whereby to improve balance and stability of voltage during the LVRT period, avoid reverse torque and mechanical resonance, and prolong the service life of the power generator. Moreover, the present invention constrains the sum of the compensation currents below the power threshold to prevent the circuit of the power generator from being overloaded and damaged, whereby is prolonged the service life of the power system.
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