Abstract
After the distributed generation connecting distribution network, the load presents a bidirectional power characteristic. For the large-scale power grid EMT simulation, an accurate load model is the premise of correctly simulating the response of the AC/DC system to the fault. Bidirectional loads are characterized as voltage and frequency dependent power sources that cannot be directly incorporated into EMT computing networks. This paper proposes a bidirectional load modelling method for 10,000-node power grid EMT simulation. The bidirectional load is connected to the power grid through a proposed innovative interface method which realizes the conversion of bidirectional power load into instantaneous current. The proposed bidirectional load modelling method is applied to the EMT transient program of ADPSS, and the correctness and effectiveness of the bidirectional load modelling method are verified by comparing the field and simulation waveforms for the small-scale power grid and the large-scale regional power grid EMT simulation. The comparison results show that the proposed method has high simulation accuracy and can satisfy the EMT simulation requirements of the 10,000-node grid with large-scale bidirectional load.
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