Digital Twinning And FPGA Implementation Of Distributed Wind Power Distribution System

With the increasing penetration of wind turbines with grid-following voltage source converter in the power grid,the dynamic stability problem of power systems caused by wind turbines disconnecting from the grid due to distribution system faults has become increasingly prominent.Electromagnetic transient simulation is an important means to study the dynamic characteristics of power systems.With the proposal of the "digital twin of power system" concept and the "14th Five-Year Plan" for the digital transformation of the power grid,electromagnetic transient simulation faces higher technical requirements in terms of computational accuracy and speed.The doubly-fed induction generator(DFIG)is a commonly used wind turbine generator in China,and the research in this paper focuses on DFIG.However,the DFIG is relatively complex,and the electromagnetic transient simulation efficiency is low.Considering the scenario of wind power connected to the distribution system,the quick response and complexity of power electronics devices in wind turbines,as well as the large number of mechanical components,make it difficult to coordinate the time scale of traditional electromagnetic transient simulation,and difficult to meet the needs of the development of new power systems.Moreover,the traditional approach of single machine multiplication and subjective simplification cannot comprehensively and accurately reflect the actual operational characteristics of wind power grid-connected systems,which also fails to meet the needs of the development of "new distribution systems".Based on the above research background,the main research work of this paper includes:1)Analysis and summary of the meaning of "digital twin of power system",and elucidation of the relationship between "digital twin of power system" and electromagnetic transient simulation of power system.This paper proposes a technical roadmap for realizing the digital twin of power system based on FPGA-based distributed DFIG distribution system,providing ideas for realizing the digital twin of power system.2)Propose a stacked inverse method for the admittance matrix of passive nodes in power system,design a generic underlying algorithm module for calculating the power grid and DFIG in the field-programmable gate array(FPGA),and test the performance of the underlying algorithm module in the Vivado simulation environment to verify the FPGA’s acceleration capability for underlying algorithms.3)Propose a virtual capacitor equivalent method for decoupling the equivalent circuit of the asynchronous machine with fixed rotor "T-type" and propose a parallel algorithm for each component inside the DFIG.Finally,based on the Verilog,construct a DFIG-IP digital twin.This paper compares the simulation results of the DFIG-IP digital twin with those of the Simulink simulation to verify the simulation accuracy.This paper completes the hardware-heterogeneous collaborative simulation experiment of RT-lab and FPGA.4)This paper proposes an attention mechanism(AM)algorithm framework for abnormal identification in wind power grid-connected systems,and constructs a wind power grid-connected digital twin based on the fusion of mechanism-driven and data-driven approaches.To evaluate the abnormal identification performance of the digital twin,the Sensing Delay Constant of Digital Image(SDC-DI)indicator is proposed accordingly.Finally,based on the attention mechanism framework,this paper verifies the effectiveness of the attention mechanism algorithm in the scenario of a distribution system with 16 DFIGs connected.