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FPGA-based Real-time Simulation For Active Distribution System

Posted on:2015-11-06Degree:DoctorType:Dissertation
Country:ChinaCandidate:C D DingFull Text:PDF
GTID:1222330485491708Subject:Power system and its automation
Abstract/Summary:PDF Full Text Request
Real-time simulator of active distribution network is an important platform for technology innovation, concept validation, algorithm testing and equipment development. It requires very high computational capability in order to meet the real-time step-size constraints. FPGA is a new and powerful digital hardware with inherent parallel architecture and deeply pipelined structure. Therefore, a new-type real-time simulator for active distribution network is developed based on FPGA. The work of this dissertation emphasizes on simulation framework, element modeling and hardware design. The detailed work is summarized as follows:(1) According to the requirement of real-time simulation, the overall simulation framework of FPGA-based real-time simulator is proposed. Multi-level parallel architecture of electrical system including system level, modular level and elementary level parallelism is proposed. Then the sequential solving method of control system is designed based on FPGA. The multi-level parallel architecture of control system, involving system level, structural level and elementary level parallelism is developed. In the end, interface module of electrical and control system based on FPGA under different time-steps is also realized. Case studies show that the simulation framework provides highly parallelism and powerful computational capability, it can totally meet the requirement of real-time simulation for active distribution network under small time-step.(2) Considering the modeling requirement of real-time simulation, common elements including passive element, line, source, breaker and measurement element are designed based on FPGA. The modeling and hardware design of power electronic device is also presented. Finally, this dissertation proposes the design method of typical distributed generations and control elements. All element modules fully demonstrate the highly parallelism of FPGA. Case studies show that designed element modules can realize high speed computing and highly accuracy compared with commercial simulation tools.(3) The detailed hardware design of real-time simulator is proposed, including global control module, solver of electrical system, solver of control system, interface of electrical and control system and waveform output module. The relationship and connections of these modules are demonstrated. All the modules accommodate the parallel FPGA architecture. The interface of developed real-time simulator and physical device is designed. Case studies validate the effectiveness of the proposed interface.(4) Various study cases including typical distribution system, photovoltaic generation system, photovoltaic-battery hybrid generation system and active distribution network are simulated in order to validate the developed simulator. Mostly encountered large signal disturbances are considered in the cases. The simulation results show great coherence with PSCAD/EMTDC and RTDS. The analysis of simulation speed and resource consumption show superiority on computational power and cost compared with RTDS.
Keywords/Search Tags:FPGA, active distribution network, real-time simulation, modeling, distributed generation
PDF Full Text Request
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