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《Power System Technology》 2013-10
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An AVC System Based Coordinated Control Method for Reactive Power at Gateway Between Provincial and Regional Power Grids

ZHANG Yongjun;ZHANG Xitian;SU Jiehe;Key Laboratory of Clean Energy Technology of Guangdong Province(School of Electric Power,South China University of Technology);  
It is the key problem in automatic voltage control(AVC) of large-scale power grids to quantitatively assess the reactive power regulation capability of provincial power grid to determine the control range of reactive power at the gateway of provincial power grid. Based on the idea of layered decoupling, firstly the definition of average coordination power factor limits(ACPF) is given to evaluate the limit of provincial power grid to withstand the reactive power, and the optimized mathematical model of ACPF is solved to obtain the correlation curve between ACPF and load level transmitted from provincial power grid to subordinate power networks; then based on the differences among loads of 500kV substations, the approximate linearization calculation of limit value of the coordinated power factor at main gateway is performed, and taking it as the constraint a calculation model and its fast estimation method for the lower limit value of coordinated power factor at subordinate gateway are established to implement dynamic setting of parameters of AVC system; finally a method to implement the AVC system based coordinated reactive power control at the gateway between provincial power grid and regional power grid is given. Simulation results of applying the proposed method to a certain regional power grid in Guangdong power grid show that the proposed method is favorable for energy-saving and loss-reduction, improving voltage quality, enhancing security margin of voltage and reactive power in provincial power grid and bringing the potential of area substation capacity into play.
【Fund】: 国家高技术研究发展计划(863计划)项目(2012AA050201)~~
【CateGory Index】: TM76
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