Study On The Validity Of The RTDS Simulations In The Bulk Power System

Power system simulation is an important cognitive tool and instrument to power system. With the rapid progress of the national interconnected power grid, the security and stability control of network will become very complicated, which has put forward higher requirements for the power system simulation technology. Currently CSG owns the largest RTDS real-time simulation system, equipped with the real DC control and protection system. The RTDS model is for the research of the parallel AC-DC power gird's operational characteristics after±800kV YunGuang HVDC project has put into operation, whose credibility will directly affect the effectiveness of the following study based on it. How to correctly assess the results of real-time simulation and analysis the main factors that affect the credibility of the simulation will be very important.This paper contained the following content:The component model and data's differences between the BPA model of Southern China Power Grid in 2010 and the RTDS model were introduced.Put forward the simulation error indicators in quantitative error evaluation system. For the system vibration characteristics had an obvious difference of time zone, an error assessment according to the period of time could not only gave the quantitative error indicator, but also had a clear physical meaning, which included initial steady state, value of the first swing, rise time, settling time, damping ratio, the oscillation frequency and new steady state after fault.As the large amount of power system variables and complex evaluation factors, the theory of fuzzy was used to model simulation credibility evaluation. The results of the assessment of credibility were set as "excellent", "good", "general", "poor" and "bad",and the three levels of hierarchical fuzzy comprehensive evaluation were from different experiments, different observation place and different observables. The calculation of the credibility of the RTDS model compared with the BPA results verified its effectiveness and flexibility.Finally, the factors that affected the simulation credibility of this RTDS model were explored, including differences of synchronous generator models and parameters, simulation step and load model, which could improve the credibility of simulation results.