摘要
通过瞬时无功功率P-Q理论(IRP)及电流物理分量理论(CPC)在电网电压、电流为正弦的三相三线制不对称电路中的应用的对比,表明瞬时无功功率理论的分析结果与电路中的某些功率现象不一致:即无功功率Q为零时,瞬时无功电流可能不为零;有功功率P为零时,瞬时有功电流不为零;电源电压为正弦,负荷为非谐波源时,瞬时有功电流和瞬时无功电流中都包含三次谐波分量。瞬时有功功率p、瞬时无功功率q与有功功率P、无功功率Q及不平衡功率D之间的关系说明p、q分别与多个功率现象相关,仅用P、Q的瞬时值不能无延时的辨识三相负荷不对称系统的功率特性。这一结论对有源电力滤波器的控制算法具有重要意义。
The comparison of the instantaneous reactive power PQ theory （ IRP） with the theory of the current＇s physical components （CPC） presented in this paper reveals the results of the IRP P-Q theory are inconsistent with power phenomena in three-phase, three-wire circuits with sinusoidal voltages and currents. Namely, according to the IRP P-Q Theory the instantaneous reactive current earl occur even if a load has zero reactive power Q. Similarly, the instantaneous active current can occur even if a load has zero active power P. Moreover, these two currents in circuits with a sinusoidal supply voltage can be nonsinusoidal even if there is no source of current distortion in the load. The relationship between the instantaneous powers （ p, q） and the active, reactive and unbalanced power （ P, Q,D） shows the p and q powers are associated with multiple phenomenon, and the IRP P-Q Theory can not identify power properties of three-phase unbalanced loads with a pair of values of p and q powers instantaneously. This conclusion may have an important value for control algorithms of active power filters.
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2006年第5期100-102,110,共4页
High Voltage Engineering
关键词
瞬时无功功率理论
电流物理分量理论
有源滤波器
不对称系统
控制算法
instantaneous reactive power theory
theory of current＇s physical components
active power filters
unbalanced systems
control algorithms
