| Voltage is one of the important target in improving the quality of electric energy, in ensuring the running of power network with security and economy, in ensuring the security of production and electric equipments. The voltage and reactive power control system can improve voltage quality and reduce the active power loss.An "anti_deadline area" method and "fuzzy inference" is presented in this paper based on the improvement of the conventional "nine_area control strategy" and the action of the equipment is effectually controlled. Transformer substations are controlled in this centralized system. The research of supervisory and control in this system ,including the modeling of power network ,the design for the structure of electric element ,the analysis for the structure of power network ,and the realization in software are described in this paper. Elements of power network in the supervisory and control system interact with each other by use of the "site structure" ,electrification of the elements and the modeling for node analysis and the analysis for the running mode of the transformers are realized. It is adapt to complex power network model. The protocol of communication between this system is set down according to the CDT protocol .A scheme of compatible between SCADA system and this system and program structure for supervisory and communication is discussed and the design of the real time database used in this system is described in this paper. |
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