Harmonic Analysis of H Class Gas Turbine Generator Starting With Static Frequency Converter Based on Matlab/Simulink Simulation

Abstract

With the development of gas-steam combined cycle power generation technology, the requirements of generator capacity and parameters are constantly improving. The generators of H class gas-steam combined cycle generator unit need to have more stable, efficient and safe starting requirements. It also stimulates improvement of static frequency converter (SFC) technology facing more challenge. SFC technology has displayed its advantages in controlling accurately, flexibly and efficiently. Meanwhile, SFC brings more harmonic components to influence the quality of power system. SFC start-up simulation model of H class gas turbine generator was built by Matlab/Simulink to simulate the generator start-up process, the evolvement of various parameters was researched and the proportion of harmonic components during the generator starting was analyzed. The simulation results show that the SFC start-up can increase the speed of the generator flexibly by adjusting the frequency and amplitude of the output current, and the impact of the generator start-up is small. However, large numbers of nonlinear electrical components built in SFC will cause higher proportion of harmonic components appear in power system and influence power quality. Therefore, two optimization schemes for SFC access were proposed to suppress harmonic effects, which are the scheme of adding input reactor before SFC and the scheme of changing generator end of input power supply. Through the simulation, it was proved that the two schemes can effectively suppress or reduce the harmonic effect and meet the requirements of power quality.

Keywords

• gas-steam combined cycle power generation
• static frequency converter (sfc)
• variable frequency speed regulation
• heavy duty gas turbine generator
• harmonic analysis