基于瞬时无功功率理论的无功电流检测

为了实现电网谐波和无功电流的准确实时检测,在对同步坐标变换思路进行改进的基础上,提出了一种结合广义瞬时无功功率理论的无功电流检测方法,并进行了仿真。结果表明,该方法能更加准确地检测出广义瞬时无功补偿电流即不对称三相系统中的谐波、不对称分量以及无功电流分量的和,并能适用于三相电源电压对称无畸变和三相电源电压不对称且畸变的情况。理论推导和仿真实验结果验证了该方法的正确性和有效性。

Detection for reactive current based on the theory of instantanous reactive power

On the basis of the improved synchronous coordinate transformation, a test method of reactive current combined with the theory of generalized instantaneous reactive power is presented in order to realize the real-time and accurate detection for the harmonic and reactive current. Results of simulation show that the presented method can test the general instantaneous reactive compensative current, i.e. the sum of harmonic component, asymmetrical component and reactive current component more accurately. It can be used under the circumstance of three-phase symmetrical voltage without distortion and that of three-phase asymmetrical voltage with distortion. Results of theoretical deduction and simulating experiments verify the correctness and effectiveness of the method.