MEDIUM VOLTAGE SOLAR PV TRANSIENT ANALYSIS USING KRYLOV SUBSPACE TECHNIQUES

摘要

There has been increasing use of renewable energy resources to provide power to the electric utility grid. Because renewable generation is variable and often connected at medium voltage distribution levels, there is increasing need for real-time coordination and control of medium voltage power electronic converters. However, the associated modeling and simulation of distribution system transients often requires the evaluation of hundreds of electrical variables. Therefore, model order reduction techniques are needed to simplify and minimize the time needed for analyzing and developing power electronic controllers for ac distribution systems that include large amounts of variable energy sources. This paper describes a block Krylov-subspace model reduction technique suitable for analyzing and designing the control systems for solar photovoltaic (PV) and wind turbine power electronic converter circuits. This paper provides a description of applying Krylov model order reduction techniques to a modified IEEE 123-node test feeder is given. The model error is evaluated in terms of frequency response to evaluate the accuracy of the Krylov-subspace method. Detailed results are given for the transient operation of a 250 kW grid-connected PV array..