【作者】 杨晓玲；

【导师】 朱群雄；

【作者基本信息】 北京化工大学 ， 控制理论与控制工程， 2010， 博士

【摘要】 随着煤矿生产机械化、自动化程度的不断提高,井下供电容量不断增大、电网电压不断提高,高压供电距离的不断增加,对煤矿井下供电系统可靠性、安全性和连续性的要求也越来越高。矿用隔爆高压馈电开关作为煤矿井下高压供电系统终端线路的主保护,对于电缆和变压器发生短路、过流、漏电和电缆损坏等故障起保护作用,从而保证其控制的整个高压线路的供电安全。但伴随着生产的飞速发展,安全与生产的矛盾日益突出。现有的技术装备已不能满足安全生产的要求,尤其是不能满足数字时代安全的要求。煤矿安全生产迫切要求更加可靠、灵敏、准确和安全的数字化产品装备。本文以此为背景,针对矿用高压开关综合保护研发中涉及到的若干问题进行了深入的研究。综合全文,论文工作取得了一些成果,对于进一步提升保护系统的性能,提高煤矿井下生产作业的安全性和供电自动化具有重要现实意义和经济价值。主要工作如下：对微机保护常用的算法进行了研究,重点针对电力系统故障时故障电流和电压所表现出的特征,提出了一种新的傅立叶改进算法,并对新算法的性能进行了多方面的仿真研究,理论分析和仿真结果表明：该算法可以很好的抑制故障信号中的衰减非周期分量,求出的幅值和相位具有较高的计算精度,为在继电保护中进行幅值和相位比较提供了依据。煤矿井下环境恶劣,信号容易受到各种干扰,因此需要对现场采集的各种信号进行预处理。本文提出了基于融合策略的改进粒子群算法,并运用于数字低通和带阻FIR滤波器的优化设计,仿真结果表明了算法的有效性,为系统保护信号的处理提供了一种新的方法。技术进步以及故障录波信息网的建立使大量故障暂态信息的利用成为可能,也为供电系统故障诊断提供了新的信息源——故障后电流、电压等暂态电气量。针对这些电气量隐含的故障特征,提出基于小波包特征提取的BP-PSO神经网络故障诊断方法,仿真结果验证了方法的有效性,对实现事故情况下科学调度、尽快排除故障、保证系统安全、稳定、经济运行具有重要现实意义。充分利用单片机丰富的位操作指令,提出一种按键状态识别算法并编制了程序,使用效果良好,可以有效防止由于按键的抖动而造成的误判。完成了保护系统的软硬件开发。首先用所设计的FIR低通和带阻数字滤波器用于对采集的信号进行预处理,得到满足算法要求电信号的谐波分量,之后通过运用改进傅氏算法实现了用于三相短路的“相敏保护”功能和用于选择性漏电的“基于零序电压电流五次谐波比相的漏电保护”功能,有效简化了硬件电路设计,使系统整体性能达到最优。最后给出了保护系统在某矿井的实际应用效果。对于提高采区供电系统保护动作的选择性和可靠性,改善采区供电质量,减少设备故障率,进而减少因故障频发而造成的无计划停电现象,具有重要意义。更多还原

【Abstract】 With the development of coal production mechanization and automation, Power capacity, voltage and the supplying distance increase greatly. It needs the higher requirements of reliability, safety and continuity for mine power system. As the mainain protection of terminal line of high voltage power supply system in Underground mines, the high-voltage mining flame-proof feeder switch has the protect functions when in the faults of cable and transformer short-circuit, over-current, leakage and cable damage, etc.With the rapid development of production, the contradiction between production and safety is serious. The existing technology and equipment cannot satisfy the request of production safety, especially cannot meet the safety of digital era. Production safety in coal mine demands more reliable and sensitive, accurate and safe digital products and equipment. Under this background, we spread out research around the problems involved in the development of high-voltage switchgear digital protection system. The paper work have made some achievements which have practical significance and economic value to enhance the performance of the protection system, to improve production safety of coal mines and Power automation. The main jobs are as follows:The paper carry out research on the common algorithms in digital protection, especially focusing on the characteristics which the fault current and voltage shown under power system fault situations. And puts forward a new kind of fourier algorithm, theoretical analysis and simulation results shows that the new algorithm can effectively inhibit the decaying amperiodic components in the fault signals. The amplitude and phase computed have high precision which provide the basis for the amplitude and phase comparison in relay protection.In coal mine, the signals are interferenced easily, The signal pre-processing is necessary. This paper proposes an improved particle swarm algorithm based on fusion strategy, which used to optimize the lowpass FIR DF and stopband FIR DF. Simulation results show the effectiveness of the new method.The paper proposed the fault diagnosis method based on wavelet packet feature extraction and BP-PSO ANN. Simulation results demonstrate the validity of the proposed method.Make full use of the rich bit instructions in microcontroller, the paper proposed a new key state identification algorithm, the operation corresponding program shows the goog performance of the algorithm.Complete the hardware and software development of the protection system. First, use lowpass and stopband DF to preprocess the sampled data, then, use the proposed fourior algorithm to realize the Phase sensitive protection and the selective leakage protection. The software effective simplified the design of hardware circuit.Finally, Give a practical application of the protection system, the results are good. It has vital significance on improving the Selective and reliability of protection system, power supply quality and reducing equipment failure in mining area.更多还原