基于WAMS的矿井电网参数关联保护系统的研究
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摘要
IEEE 1588是关于网络测量和控制系统的精密时间协议(precision time protocol, PTP)标准,其网络对时精度可达亚μs级。文章介绍了IEEE 1588标准定义的高精度时钟同步的原理以及PTP时钟模型,针对遵循IEC 61850标准的变电站通信网络拓扑结构,提出了IEEE 1588在矿井变电站内的应用方案,讨论了各方案的优缺点,并给出了时钟设备的冗余配置方法及其功能实现。文章从理论上分析了IEEE1588标准的时钟同步误差,最后从全网的角度探讨了该标准的具体应用策略。
本文构建了基于FFT(快速傅立叶变换)的信号差异模型,并利用信号互差异度辨识暂态过度阶段零序电流波形频谱差异性。建立了暂态信号波形相似性比较新方法,并应用于煤矿电网选择性漏电保护系统。新选漏方法的准确性、适应性、有效性等用仿真试验进行了验证。
This IEEE 1588 defines a precision time protocol (PTP) for networked measurement and control systems, which supports systemwide synchronization accuracy in the submicrosecond range. This paper introduces the principle of high precision clock synchronization and the PTP clock models defined in IEEE 1588 standard. According to topological structure of substation communication network conforming to IEC 61850 standard, application schemes of IEEE 1588 in coal mine substation are proposed, and their advantages and disadvantages are also discussed. Then the redundancy configuration method of clock unit and its function implement are given. Clock synchronization error of IEEE 1588 standard is theoretically analyzed. At last, concrete systemwide application strategies of IEEE 1588 standard in area power network are researched.
Signal differences model was constructed based on FFT (Fast Fourier Transform) in this article and zero sequence over-current waveform spectrum differences of transient stage are recognized. A new method of transient signal waveform similarity comparison is established, and used selective leakage protection system in coal mine power system. The accuracy, adaptability, effectiveness etc. of the new selective leakage method are verified by simulation.
本文构建了基于FFT(快速傅立叶变换)的信号差异模型,并利用信号互差异度辨识暂态过度阶段零序电流波形频谱差异性。建立了暂态信号波形相似性比较新方法,并应用于煤矿电网选择性漏电保护系统。新选漏方法的准确性、适应性、有效性等用仿真试验进行了验证。
This IEEE 1588 defines a precision time protocol (PTP) for networked measurement and control systems, which supports systemwide synchronization accuracy in the submicrosecond range. This paper introduces the principle of high precision clock synchronization and the PTP clock models defined in IEEE 1588 standard. According to topological structure of substation communication network conforming to IEC 61850 standard, application schemes of IEEE 1588 in coal mine substation are proposed, and their advantages and disadvantages are also discussed. Then the redundancy configuration method of clock unit and its function implement are given. Clock synchronization error of IEEE 1588 standard is theoretically analyzed. At last, concrete systemwide application strategies of IEEE 1588 standard in area power network are researched.
Signal differences model was constructed based on FFT (Fast Fourier Transform) in this article and zero sequence over-current waveform spectrum differences of transient stage are recognized. A new method of transient signal waveform similarity comparison is established, and used selective leakage protection system in coal mine power system. The accuracy, adaptability, effectiveness etc. of the new selective leakage method are verified by simulation.
引文
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