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中文摘要：
基于精确分析特高压线路输电能力的系统模型，结合特高压输电系统运行时的热极限、功角极限和电压约束，给出了用功率圆分析有功功率、无功功率与给定输电系统参数三者之间关系的方法．对于给定的特高压输电系统，功率圆不仅能方便地量化其运行区域，且能快速确定其输电能力的限制因素、对晋东南—南阳-荆门特高压交流实验示范工程进行了仿真，结果验证了方法的有效性．
英文摘要：
Based on the UHV（ultra high voltage ） model and Thermal-Angle-Voltage limitation as a function of the power carried by the line, a power-circle has been proposed. It analyzes specific system parameters and the transmission of active power and reactive power. Power- circle, referred to as the operating loadability characteristics, provides a convenient mechanism for quantifying the trade-offs. It also makes it possible to quickly identify the principal operating limitation to line loadability, which exists in UHV system. The simulation of UHV power transmission project from Jincheng to Jingzhou Via Nanyang proves the effect of this method.
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