Abstract
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. 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 input variables are tied to state variables of the circuit so that the iterative calculation is limited to the local network. The devised methodology is validated through simulation of a low-voltage microgrid on a field programmable gate array (FPGA)-based real-time digital simulation (FRTDS) platform at a 5 μs time step. Comparison with a power systems computer aided design (PSCAD)/electromagnetic transients including DC (EMTDC) model shows that the proposed method is effective.
Highlights
The energy Internet aims to build a clean, low-carbon, safe and efficient modern energy system, which supports the access of high proportion, distributed clean energy power to improve the efficiency of energy utilization and the utilization of renewable energy [1,2,3]
The papers above designed the determined hardware circuit according to the actual simulation object—the advantage of the method is that it reduces the simulation calculation time maximally, but the disadvantage is asking programmers for higher field programmable gate array (FPGA) programming capabilities and power system expertise
After applying multiport hybrid equivalent method to the 36 subnetworks, the input variables can be obtained by solving a 38-dimensional network equations that are simplified by the constraints of the input and output variables, the low-voltage microgrid was decomposed into 36 subnetworks of independent parallel computing
Summary
The energy Internet aims to build a clean, low-carbon, safe and efficient modern energy system, which supports the access of high proportion, distributed clean energy power to improve the efficiency of energy utilization and the utilization of renewable energy [1,2,3]. RTDS is a combination of specialized computer hardware and software designed for the solution of power system electromagnetic transients, which simulates power system components to test power control equipment and protection devices in real time with a typically time-step size of about 50 μs [7]. The papers above designed the determined hardware circuit according to the actual simulation object—the advantage of the method is that it reduces the simulation calculation time maximally, but the disadvantage is asking programmers for higher FPGA programming capabilities and power system expertise. Speed of real-time simulation by means of multivalued coefficient prestorage, network partitioning, is to improve speed ofand real-time simulation by means multivalued coefficient multiport hybrid the equivalent local iterative calculation. The process of writing is to improve speed of real-time simulation means of coefficient prestorage, Section
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