一种谐波潮流检测方法及数值仿真

METHOD OF MEASURING HARMONIC POWER FLOW AND ITS NUMERICAL SIMULATION

提出了一种谐波潮流的实时检测方法，利用并联电容器的谐波电流放大原理对谐波电压间接取样，并利用串联无感电阻器对谐波电流直接取样。分析了谐波潮流检测灵敏度和同次谐波电压与电流相位差角的检测灵敏度，并对相应的模拟负荷进行了数值仿真，结果表明该取样方法简单可靠，能有效地提高谐波潮流检测的灵敏度，同时也验证了检测基波潮流与谐波潮流的符号是否一致以判断某一特定负荷是否为谐波源的方法。

Sampling harmonic power flow in power system is still a difficult problem in harmonic power flow detecting. This paper puts forward a real time method of sampling harmonic voltage indirectly by use of the harmonic current magnification of shunt capacity to detect harmonic power flow, and by use of resistance without inductance to sample harmonic current directly. This paper analyzes the sampling sensitivity of harmonic power flow and the relative phase shift between the voltage and current for each harmonic, and carries out the numerical simulation for relevant simulated load. According to the result of the theoretical analysis and numerical simulation, it can be seen that the method is simple and reliable, and can improve the sensitivity of detecting harmonic power flow effectively. At the same time, the correctness of the criterion which judges whether a certain load is a harmonic source by detecting the concordance of the signs between first harmonic and higher harmonic power flow is verified.