Open AccessCoordinated control strategy of reactive power for large‐scale wind power transmission by LCC‐HVDC links
Author(s) -
Zhibing Wang,
Yang Xu,
Xitian Wang
Publication year - 2017
Publication title -
the journal of engineering
Language(s) - English
Resource type - Journals
ISSN - 2051-3305
DOI - 10.1049/joe.2017.0496
Subject(s) - ac power , volt ampere reactive , power control , power (physics) , control theory (sociology) , wind power , power balance , power factor , transmission (telecommunications) , voltage optimisation , voltage , electrical engineering , engineering , computer science , control (management) , physics , quantum mechanics , artificial intelligence
The intermittence and fluctuation of outputs of large‐scale wind farms lead to significant problems in power transmission system by line‐commuted converter high‐voltage direct current (LCC‐HVDC) links. Traditional reactive power compensation devices such as AC filters are not capable of adjusting reactive power balance continuously. This paper presents a coordinated reactive power control strategy to realise continuous adjustment. A synchronous condenser (SC) is applied in the DC converter station to cooperate with AC filters. The capacity of the SC is determined by the minimum capacity and dead zone of the AC filter unit, and cost saving is also taken into account. While power outputs of wind farms fluctuate, the setting value of DC power gets changed. The SC responses rapidly to reduce the reactive power exchange. When the reactive power demand is beyond the capacity of the SC, one AC filter unit operates and the SC readjusts to maintain the reactive power balance. The proposed control strategy is validated by simulation in PSCAD/EMTDC.