Research on distributed AC DC hybrid system and adaptive dynamic sag technology
Distributed AC/DC hybrid system adopts multi-zone flexible networking technology and consumption improvement strategy,providing efficient and feasible means for distributed new energy grid-connected and power flow optimization.For satisficing the demand for source&load's power consumption,firstly a distributed AC/DC system architecture and its energy operation mode were proposed.Then,by an-alyzing the equivalent mathematical model of the distributed AC/DC system and the generation mechanism of power-frequency and high-frequency circulating currents,an adaptive dynamic droop control strategy considering power balance control and high-frequency circulating current suppression was proposed.Fi-nally,a simulation model of distributed AC/DC system was built in PSCAD/EMTDC and verified through numerical examples.Simulation results showed that the proposed technology can achieve improved source load absorption and optimized power flow regulation while maintaining system stability.
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