Current Source Equivalent Error Mechanism Analysis and Its Improvement for Hybrid Simulation

doi:10.3969/j.issn.1000-7229.2016.06.006

Abstract

Abstract:

In traditional electromechanical-electromagnetic transient simulation， the equivalent methods of electromagnetic side system in electromechanical side mainly include current source， Norton equivalent circuit， power source etc. This paper analyzes the error mechanism of current source equivalent of electromagnetic side system in electromechanical side， and points that only transmitting the current information including magnitude and phase cannot ensure the right calculation for electromechanical side during the fault in electromagnetic side. In combination with the voltage and power constraints of the interface， we propose a equivalent method which is different from the current source. With using a step information on the electromechanical side， this method changes the calculation method of electromechanical side network from the way with the current source equivalent directly involved into iterative solution， which can solve the calculation accuracy problem of current source equivalent method caused by can't ensuring the power transmitting of the interface. An electromechanical-electromagnetic transient hybrid simulation platform of IEEE-39 node system with two DC links is built in PSCAD/EMTDC environment based on PSCAD+C. The simulation result shows that the proposed current source equivalent method can significantly improve the simulation accuracy of electromechanical side during fault.

Key words: hybrid simulation, error mechanism, equivalent method, current source

CLC Number:

TM 743

XIAO Xiangning， YANG Yang， TAO Shun， CHEN Pengwei. Current Source Equivalent Error Mechanism Analysis and Its Improvement for Hybrid Simulation[J]. Electric Power Construction, 2016, 37(6): 38-42.

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