Research On Improvement Of Accuracy And Computational Efficiency Of Interface Algorithm In Power System Electromechanical-Electromagnetic Hybrid Simulation

With the continuous development of China's HVDC project, the grid structure of the AC and DC power grid is more and more complex, and the interaction between AC and DC systems is becoming more and more prominent. Electric power system electromechanical electromagnetic transient hybrid simulation technology can simulate the electromechanical transient simulation of large scale power system.In this paper, based on the PSD-PSModel hybrid simulation program, the hybrid simulation interface algorithm is further studied. Proposed a linear multiphase coupled inductor, a capacitor, a resistor branch of electromagnetic transient parallel algorithm and improve the interface algorithm electromechanical side of an equivalent network of electromagnetic transient simulation accuracy. A curve fitting method based on the combination of non-periodic components of the least square method and the FFT fitting algorithm is proposed, which improves the accuracy of the electromagnetic transient simulation results. An equivalent admittance matrix method based on current correction is proposed to improve the stability of hybrid simulation. In this paper, a hybrid simulation interface algorithm based on pure electromechanical transient simulation is proposed, and the correctness of the PSD-PSModel hybrid simulation interface program is tested.In order to improve the computational speed of the hybrid simulation program, this paper presents a hybrid simulation multi thread parallel algorithm based on the electromechanical transient side solution network. The system is decoupled and the multi thread programming is used to design the multi thread parallel computing of the electromagnetic transient program in PSD-PSModel hybrid simulation. In this paper, the simulation program of the multi thread parallel algorithm is used to simulate the correctness and the speed of calculation. The hybrid simulation program with multi thread parallel algorithm can greatly improve the utilization ratio of the processor and the speed of simulation. In the end of this paper, we introduce the application of PSD-PSModel hybrid simulation program in the study of the actual power network.