CPT及IRPT多场景电流分解对比及分析

Comparison and analysis of CPT-and IRPT-based current decomposition in multi-scenario

以新能源为主体的新型电力系统发展对系统计量装置、功率变换设备等提出了新要求,迫切需要革新的功率理论指导上述设备的设计与控制,以适应不同电气系统结构。通过构建多种含不同源荷类型的三相电气系统场景,针对守恒功率理论(CPT)及瞬时无功功率理论(IRPT),重点讨论二者在不同应用场景中电流分解的相似点及不同点。分析结果显示:IRPT仅在电压正弦条件下可以获得较好的电流分解结果,而基于CPT的电流分解,在正弦或非正弦等不同电压、负荷情况下均可较好地解释功率传输现象、分析负荷特性,其可作为有效的理论工具用于负荷特征识别、电费计量、滤波与补偿、功率变换器等领域中。

The development of new-type power system with renewable energy as the main body puts forward new requirements for metering devices and power conversion equipment. Innovative power theory is required to devise and control the devices to adapt to various electrical system structures. The similarities and discrepancies of conservative power theory(CPT) and instantaneous reactive power theory(IRPT) in current decomposition for different scenarios are discussed by establishing multiple three-phase electrical power system scenarios consisting of different sources and loads. The results show that IRPT can obtain satisfying outcomes only in sinusoidal voltage cases. Based on CPT current decomposition,it can better explain the power transmission phenomenon and analyze the load characteristics under various voltage and load conditions. As a result,the CPT shows a promising potential in load characteristic identification,electricity metering,filtering and compensation,power converter control and so on.