电网负荷节点临界阻抗模的性质及意义

The nature and connotation of the critical impedance module of the load bus in power network

对电力系统负荷节点临界条件进行了系统地研究，从理论上论证和分析了节点临界阻抗模的若干重要性质，认为负荷节点的临界阻抗模等于其戴维南等效电路的阻抗模，它不受该点功率因数变化的影响，仅依赖于系统本身的结构和参数据此，给出了交流系统中负荷节点P－V特性曲线临界条件，提出用比较负荷工作点阻抗模与其临界阻抗模来作为电压稳定性判推，将网络理论中得最大功率传输定理拓展到交流系统，并将临界阻抗模理论用在基于运行模式的电压态势分析中．

The critical condition of the power system load node is systematically studied , and several important natures of the critical impedance module have been expounded and proved in theory It is believed that the critical impedance mod ule of load node equals to its Devenin wivalent cireuit which will not be affected by the power factor's transformation on this node and just depends on the stucture and parameters of this system. Based on it, the P-V characteristic curve and critical condition of load node in the AC system is given. Moreover it is put forward tha the comparing of the load node impedance module and the crihcal impedance module can be used in the votage stability criterion. Therefore, the maximal power transmission theorem in network theory can be expanded to the AC system. The critical impedance module theory can be applied in Voltage State and developing trend analysis based on the operation pattem.