Research On Parallel Computing Method Of Electromagnetic Transient Real-time Simulation For Microgrid

Hardware-in-the-loop real-time simulation plays a very important role in the planning,design and operation of microgrids.The microgrid containing a large amount of high frequency power switches and nonlinear components has put forward high requirements for power system real-time simulation technology.This paper has proposed a multivalued coefficient prestorage and block parallel method for real-time simulation of microgrid on FRTDS——field programmable gate array(FPGA)-based real-time digital simulation,the multi-solver real-time digital simulation platform has the characteristics such as highly parallel computing ability,smooth data transmission channel,the diversity of the multivalued coefficient prestored,optimization of task scheduling scheme.A multivalued coefficient prestorage algorithm and its implementation for realtime simulation of subnetwork has presented in this paper.Multivalued coefficient prestorage can reduce the calculation steps in real-time simulation.In order to reduce the storage pressure of the multivalued coefficients,the whole network is divided into multiple subnetworks that can be simulated in parallel,and only the parameters for computing input variables and internal variables are prestored.The multiport hybrid equivalent is performed to reduce the number of simultaneous network equations,the connection between subnetworks is established by the input variables.The input variables are tied to state variables of the circuit so that the iterative calculation is limited to the local network,and the control flow diagram is used to illustrate the concrete steps of the local iteration algorithm in nonlinear networks.At the same time,taking into account the control system model of the microgrid is described by the relationship between input and output for transient simulation,the parallel algorithm in the control system to be promoted.In the paper,a novel multivalued coefficient prestorage and block parallel method for real-time simulation of a microgrid on FRTDS is proposed.It alleviates memory requirements,and reduces the computational burden.Neither of these results is obtained by compromising the accuracy of the simulation.The method has provided a new idea for hardware-in-the-loop real-time simulation of microgrid.The devised methodology is validated through simulation of a low-voltage microgrid on FRTDS at a 5 ?s time step.Comparison with a power systems computer aided design(PSCAD)/electromagnetic transients including DC(EMTDC)model shows that the proposed method is effective.