基于新型改进矩阵束的便携式电网同步相量测量装置

Portable Grid Synchrophasor Measurement Device Based on New Improved Matrix Pencil

针对传统同步相量算法受电网间谐波影响较大的问题,本文提出了一种基于新型改进矩阵束的电网同步相量测量算法.将电网信号构建成Hankel矩阵,对其进行奇异值分解并使用自适应定阶方法滤除其中的噪声干扰分量,通过矩阵运算得到准确的电压幅值、频率及相角.经过仿真验证,本算法对含有间谐波分量的电网信号测量结果优于流行的傅里叶变换测量算法.并根据此算法设计了一款便携式电网同步相量测量装置,可解决传统同步相量测量设备体积庞大、成本较高的问题,利用高精度卫星同步信号监测晶振实际频率,动态调整采样控制参数降低采样时间误差,将同步采样的电网波形参数与时间标签等无线传输至移动终端,完成电网信号幅值、频率及相角计算.实际测试表明,本装置具有较高的测量精度,其中电压幅值、频率和相角测量误差分别为0.038 5%、0.000 51 Hz和0.053 7°,满足《电力系统同步相量测量装置检测规范》(GB/T 26862—2011),具有较强的实际应用价值.

Because the traditional synchronized phasor algorithm is greatly affected by the intermediate harmonics of the power grid,this paper proposes a synchronized phasor measurement algorithm based on a newly improved matrix bundle.The power grid signal is constructed into a Hankel matrix,which is decomposed into singular values,and the noise interference components are filtered out using an adaptive order determination method.The accurate voltage amplitude,frequency and phase angle are obtained through matrix operation,and the simulation results show that this algorithm is superior to the traditional recursive Fourier transform algorithm in measuring power grid signals containing interharmonic components.A portable power grid synchronous phasor measurement device is designed to solve the problem of large volume and high cost of traditional synchronous phasor measurement equipment.The actual frequency of the crystal oscillator is monitored by high-precision satellite synchronous signal,and the sampling control parameters are dynamically adjusted to reduce the sampling time error.The synchronously sampled power grid waveform parameters and time tags are wirelessly transmitted to mobile terminals to complete the calculation of power grid signal amplitude,frequency and phase angle.The actual test shows that the device has high measurement accuracy,in which the measurement errors of voltage amplitude,frequency and phase angle are 0.0385%,0.00051 Hz and 0.0537°,respectively,which meets the requirrement of"Test specification for synchrophasor measurement unit for power systems"(GB/T 26862—2011),and has practical application value.