基于半波Fourier算法的故障选相控制系统的设计

Design of Control System for Controlled Fault Interruption Based on Half-wave Fourier Algorithm

为了快速、准确地预测故障电流零点,设计了故障选相控制系统。基于故障选相原理,以数字信号处理器(DSP)TMS320F2812为核心,通过丰富其外设,进行控制系统硬件的设计;基于相电流突变量原理和改进半波Fourier算法,进行了故障起始时刻的判断和波形恢复,并完成了控制系统的软件设计。对故障选相控制系统的稳定性和零点预测准确度进行了测试。测试结果表明,控制器的预测结果准确、可靠,零点的预测时间<12ms,零点预测误差的3σ(σ为标准差)范围为[-0.6,0.6]ms,满足国际大电网会议(CIGRE)对选相投切控制系统准确度的要求。

In order to realize rapid and accurate prediction of zero crossing point of fault current, we designed a control system for fault phase selection. Based on the fault phase selection principle, a digital signal processor（DSP） TMS320F2812 was used as the kernel to complete the design of control system＇s hardware together with enriching its peripherals. The mutation-amount of phase-current and an improved half-wave Fourier algorithm were adopted to detect the initial time of fault current and reconstruct the waveform, respectively, and a control system software was designed. Moreover, we tested the system through experiments, and the results showed that the control system was accurate and stable： prediction time of zero-crossing point was less than 12 ms, and statistical result of 3a of prediction errors {a is standard deviation） was [---0. 6,0. 6] ms. The precision meets the demands of controlled interruption of the International Council on Large Electric Systems （CIGRE）.