Journal of South China University of Technology (Natural Science Edition) ›› 2010, Vol. 38 ›› Issue (10): 146-152.doi: 10.3969/j.issn.1000-565X.2010.10.027

• Power & Electrical Engineering • Previous Articles     Next Articles

Optimal Power Flow Calculation Incorporating Discrete Controls in AC/DC Power Systems

Lin Shun-jiang 1.2  Liu Ming-bo 1.2  Liu Zhi-wen 1.2   

  1. 1.School of Electric Power,South China University of Technology,Guangzhou 510640,Guangdong,China;2.Guangdong Key Laboratory of Clean Energy Technology,Guangzhou 510640,Guangdong,China
  • Received:2009-12-29 Revised:2010-04-12 Online:2010-10-25 Published:2010-10-25
  • Contact: 林舜江（1980-），男，博士，主要从事电力系统优化、运行与控制研究． E-mail:1sjl9800918@yahoo．com．cn
  • About author:林舜江（1980-），男，博士，主要从事电力系统优化、运行与控制研究．
  • Supported by:

    国家自然科学基金资助项目（50777021）

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Abstract:

In order to coordinate various control methods of AC/DC power systems and reduce the operation cost in steady state,a mathematical model is established to calculate the optimal power flow of AC/DC power systems.The proposed model,which is characterized by its nonlinear mixed integer programming considers not only the discrete characteristics of transformers（including converter transformers） ratio but also the shunt capacitor switching susceptance.The model is then solved by using the nonlinear primal-dual interior-point algorithm incorporating a quadratic penalty function to deal with the discrete control variables.Moreover,the introducing occasion of the quadratic penalty function and the valuating strategy of the penalty factors during the iteration are discussed.Calculation instances of two AC/DC power systems with 11 buses and 39 buses show that both the proposed optimal model and the algorithm can reliably converge to the enforceable and economic operation mode of the system.

Key words: AC/DC power system, optimal power flow, interior-point algorithm, discrete variable, penalty function