摘要
不对称、非正弦条件下三相电力系统的视在功率定义目前仍然存在争议。针对这一问题本文系统地介绍了当前占主流地位的两种观点,即理论法和实践法。这两种方法关于视在功率定义,皆是基于保持电压效应和电流效应不变而实现对负载传输的最大有功功率。在前人研究思路的基础上,提出了一种基于双重等效概念的新的视在功率定义方法,称为双重等效法。将该方法与另外两种方法作了详细的比较研究,并通过实例分析了三种不同视在功率定义方法的应用特性,结果表明:双重等效法的视在功率计算不受线路参数影响,具有更广泛的适用性与合理性。
The definition of apparent power for unbalanced or nonsinusoidal three-phase power systems is still a controversial issue presently. The paper gives a systematic elucidation of the two schools of prevailing thoughts, i.e. the theoretical approach and practical approach, both of which define the apparent power as the maximum active power that can be delivered to or absorbed by the loads while keeping the voltage effects and current effects unvaried. Based on the previous research achievements, a new definition methodology of apparent power based on the concept of dual equivalence is proposed and demonstrated, which is called dual-equivalent approach. A detailed comparative study regarding the three approaches is carried out in the paper, and several concrete cases are given to demonstrate the application behaviour of the three different apparent power definition approaches, which indicates that, calculation of apparent power by the dual-equivalent approach does not recur to impact from the line parameters, and possesses preferable adaptability and reasonability.
出处
《电工技术学报》
EI
CSCD
北大核心
2008年第9期1-9,共9页
Transactions of China Electrotechnical Society
关键词
视在功率
不对称系统
双重等效
电压与电流效应
Apparent power, unbalanced power system, dual-equivalence, voltage and current effects
