基于STM32 系列微处理器的矿井电网选择性漏电保护研究-电气工程专业论文.docxVIP

基于 STM32 系列微处理器的矿井电网选择性漏电保护研究 摘 要 随着人类对能源的需求量与日俱增，煤矿工业自动化程度也在不断提高，但是煤矿事 故仍旧屡屡发生。因此研发更高精度，高可靠性的智能矿用保护设备势在必行。本文设计 的矿用隔爆型真空馈电开关给煤矿安全生产带来了重要价值和现实意义。 本文从理论上对矿井电网中性点不接地系统进行了详细的分析，并采用 ST 公司必威体育精装版 推出的 STM32 系列微处理器作为设计核心，进行了相关硬件和软件的设计；此外，针对系 统可能遇到的各种干扰，从软硬件两方面分别进行了抗干扰设计；最后通过试验数据验证 了整个系统对线路中出现的各种故障具有可靠的动作特性。 本设计针对性的提出了零序电流方向型选择性漏电保护原理，并通过比相电路验证了 其可行性；同时设计了 CAN 通信模块的下位机硬件电路、上位机 CAN-USB 转换接口及测试 系统监控界面；并将同步交流采样技术和全波傅立叶算法成功应用于 STM32 处理器的数据 采集与处理,有效提高了采样精度。 矿井现场运行情况表明该保护系统性能稳定、动作可靠，有效提高了矿井供电系统的 安全性与可靠性。 关键词：STM32 ，馈电开关，选择性漏电保护 ，CAN i RESEARCH ON SELECTIVE LEAKAGE PROTECTION FOR MINE POWER BASED ON STM32 MICROCONTROLLERS ABSTRACT With the increasing demand for energy, the automation degree of coal mine industry is also increasing; however, the accidents of coal mine still occur frequently. Therefore, it’s imperative to develop the smart feeder switchgear, which is more sensible and reliable. This design of flameproof vacuum feeder switchgear brings important value and practical significance to safety production of coal mine. This paper makes a detailed analysis on the neutral point ungrounded mine power system on theory, and takes the STs new STM32 microprocessor as the core of design, has finished the relevant design on hardware and software. Furthermore, in allusion to various disturbances that the system may face, this paper designs the anti-jamming from hardware and software aspects. Finally, experimental data validate the reliable characteristics of protection of the whole system when various faults of lines appear. This design puts forward using direction-based zero sequence current selective leakage protection principles, and its feasibility is verified by phase comparison circuit; what’s more, we designed the hardware circuit of lower computer, CAN-USB converter interface of PC and monitoring interface of test system; In addition, synchronous sampling and full-wave Fourier algorirhm is successfully applied to the STM32 processor’s data acquisition and processing, effe