基于随机子空间的船舶电网谐波检测

船舶电网的谐波源密集，产生的谐波直接影响船舶通信和导航设备的正常工作．针对强噪声背景下，谐波参数不易准确检测的问题，将随机子空间理论（SSI）和最小二乘法运用于船舶电网的谐波检测．首先将采集到的电网电流信号构成Hankel矩阵，然后经矩阵OR分解和奇异值分解（SVD），得到谐波频率，进而求出谐波幅值和相位．在Matlab7．1／Simulink环境下搭建船舶电网谐波源模型，仿真结果表明该方法检测精度高、抗干扰能力强、简便易行，具有良好的工程应用前景．

Measurement of marine power system harmonics based on stochastic subspace identification

Marine power system harmonics source is crowded, the resulting harmonics directly affect the ma- rine Communication and navigation equipment to work properly. For the strong background noise, harmonic parameters difficult to accurately detect the problem, stochastic subspace identification theory （SSI） and the least squares method used in the marine power grid harmonics detection. Gather grid current signal form Han- kel matrix, the QR decomposition and singular value decompostion （SVD）, get harmonic frequency, and then obtained the harmonic amplitude and phase. Environment to build the ship in Matlab7. 1/Simulink harmonic source model, simulation results show that the method detects with high precision, strong anti-interference, simple, with good prospects for engineering applications.