Research on Serial VSC-LCC Hybrid HVdc Control Strategy and Filter Design Scheme

Energies

Zhibing Wang¹  Fan Cheng¹  Lijun Xie¹ 

[1] State Key Laboratory of Operation and Control of Renewable Energy & Storage Systems, China Electrical Power Research Institute, Beijing 100192, China;

关键词: high voltage direct current (HVdc);    line commutated converter (LCC);    voltage source converter (VSC);    control strategy;    filter design;    short circuit ratio (SCR);   

DOI  :  10.3390/en13092260

来源: DOAJ

【 摘 要 】

This paper investigated the characteristics of a novel type of hybrid high voltage direct current (HVdc) converter, which is composed by line commutated converter series with voltage source converter. The system and valve level control strategies are introduced, which can provide ac system voltage support. A novel filter design scheme composed by resonant filers for hybrid HVdc are also proposed, which can decrease the capacity of reactive power compensation equipment without deteriorate harmonic characteristics. The ac voltage of HVdc fluctuation level caused by transmitted power variation will be effectively reduced, with the coordination between filter design scheme and converter control. In addition, the influence of ac grid strength is also analyzed by equivalent source internal impedance represented by short circuit ratio (SCR). Finally, the +800 kV/1600 MW hybrid HVdc system connecting two ac grids under different SCR cases are studied, and the PSCAD/EMTDC simulation results have validated the effectiveness for proposed strategy.

【 授权许可】

Unknown