Optimization-based reactive power control in HVDC-connected wind power plants

RENEWABLE ENERGY

卷:109

Article

Schonleber, Kevin¹  Collados, Carlos²  Teixeira Pinto, Rodrigo²  Rates-Palau, Sergi¹  Gomis-Bellmunt, Oriol² 

[1] GE Renewable Energy, Roc Boronat 78, Barcelona 08005, Spain

[2] Univ Politecn Cataluna, Ctr Innovacio Tecnol Convertidors Estat & Acciona, Dept Engn Elect, ETS Engn Ind Barcelona, Av Diagonal 647,Pl 2, Barcelona 08028, Spain

关键词: Reactive power;    Optimal power flow (OPF);    High voltage direct current (HVdc);    Wind power;   

DOI  :  10.1016/j.renene.2017.02.081

来源: Elsevier

【 摘 要 】

One application of high-voltage dc (HVdc) systems is the connection of remotely located offshore wind power plants (WPPs). In these systems, the offshore WPP grid and the synchronous main grid operate in decoupled mode, and the onshore HVdc converter fulfills the grid code requirements of the main grid. Thus, the offshore grid can be operated independently during normal conditions by the offshore HVdc converter and the connected wind turbines. In general, it is well known that optimized reactive power allocation might lower the component loading and power losses. This paper aims to propose and assess a reactive power allocation optimization within HVdc-connected WPPs. For these systems, the offshore converter operates the adjoining grid by imposing frequency and voltage. The reference voltage magnitude is used as additional control variable for the optimization algorithm. The loss function incorporates both the collection grid and the converter losses. The use of the proposed strategy results in an effective reduction of losses compared to conventional reactive power dispatch strategies alongside with improvements of the voltage profile. A case study for a 500 MW sized WPP demonstrates an additional annual energy production of 6819 MWh or an economical benefit of 886 k(sic)yr(-1) when using the proposed strategy. (C) 2017 Elsevier Ltd. All rights reserved.

【 授权许可】

Free