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 0.038 5%, 0.000 51 Hz and 0.053 7°,respectively, which meets the requirrement of "Test specification for synchrophasor measurement unit for power systems"(GB/T 26862—2011), and has practical application value.
此外,为解决晶振频率可能出现偏移[18]、引起采样时间误差的问题[19],利用全球定位系统(Global Positioning System, GPS)提供的误差在100 ns以内的高精度秒脉冲(Pulse Per Seconds, PPS)信号[20],监测晶振实际频率,实现变间隔同步采样,并触发逐次比较型模数转换器[21](Successive Approximation-Analog to Digital Converter,SAR-ADC)实现电网信号的同步采样,从而降低采样误差.最后,在仿真验证本文新型改进矩阵束有效性的基础上,将其植入移动终端,该终端可利用蓝牙、Wi-Fi实现与MCU之间的数据传输,解决传统有线连接传输距离受限以及布线困难等问题,方便数据传输[22],可有效完成实际应用中的电网相量测量任务,具有较强的实际应用价值.
本文在Windows操作系统中进行Android软件开发,Android系统开发环境主要包括JDK(Java Development Kit)、Android Studio和Android SDK(Software Development Kit)三部分.开发语言为Java编程语言,使用Redmi K20Pro(内存6 GB)作为软件的测试平台,处理器为高通骁龙855(主频2.84 GHz).
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