摘要
近年来,国家大力推进煤层气勘探开发行动计划,有效促进了煤层气产业的快速发展。一方面,当前基于交流的煤层气地面排采供电网络,电费支出占生产成本一半以上,极大地制约了煤层气产业的可持续发展;另一方面,直流微电网以其控制方式简单、电能变换环节少、不存在无功功率和频率稳定等优势,已成为未来微电网的发展趋势。为解决目前基于交流的煤层气地面排采供电网络存在的用电严重不合理问题,本文拟对煤层气地面排采供电网络进行直流化改造。首先,对应用于煤层气地面排采供电网络的无功补偿装置和周期性变工况条件下的电动机节能途径进行了梳理;其次,在建立包含分布式电源、储能装置和煤层气井排采设备的直流微电网基础上,围绕其拓扑结构、优化配置、模型建立、电压稳定控制及协调运行等方面,对用于煤层气井排采设备供电的直流微电网优化与控制关键技术进行了详细阐述;最后,从拓扑结构与系统优化配置相互作用关系、双向能流下的系统稳定性判据、计及源-网-荷多因素耦合作用的电压稳定控制等关键技术进步,以及用于煤层气井排采设备供电的直流微电网应用发展前景两方面进行了展望,指出相关优化与控制关键技术的进步可为煤层气地面排采供电网络直流化提供科学依据和理论指导。
In recent years,the Chinese government has vigorously promoted the coalbed methane(CBM)exploration and development action plan,effectively promoting the rapid development of CBM industry.On the one hand,the current AC-based power supply network for CBM surface drainage accounts for more than half of the production cost of electricity,which greatly restricts the sustainable development of CBM industry.On the other hand,DC micro-grid has become the development trend of micro-grid in the future because of its advantages such as simple control mode,fewer energy conversion links,no existence of reactive power and frequency stability.To solve the serious problem of power consumption in the current AC power supply network for CBM surface drainage,the DC transformation of power supply network for CBM surface drainage was proposed in this paper.Firstly,the reactive power compensation devices applied to the power supply network for CBM surface drainage and the energy-saving ways of the drainage equipment motor in CBM well under the periodic dynamic alternating load characteristics were reviewed.Secondly,based on the establishment of DC micro-grid including distributed energy resources(DERs),energy storage units and the drainage equipment in CBM well,the key technologies of optimization and control of the DC micro-grid for the drainage equipment of CBM well were emphatically expounded in terms of topological structure,optimal configuration,model establishment,voltage stability control and coordinated operation.Finally,from the aspects of key technological progress including the interaction between topological structure and system optimal allocation,system stability criterion under bidirectional energy flow and voltage stability control considering source-network-load coupling were analyzed,and the future development and application of the DC for the drainage equipment of CBM well was also given.It was pointed out that the progress of related key technologies can provide a scientific basis and theoretical guidance on the DC micro-grid for drainage equipment of CBM well.
作者
王浩
WANG Hao(School of Electrical Engineering and Automation,Henan Polytechnic University,Jiaozuo 454000,China)
出处
《煤炭学报》
EI
CAS
CSCD
北大核心
2019年第S01期355-361,共7页
Journal of China Coal Society
基金
国家自然科学基金资助项目(61703144)
河南省高等学校重点科研资助项目(19B470003)
河南理工大学博士基金资助项目(B2018-27)。
关键词
煤层气
排采机构
直流微电网
优化与控制
coalbed methane
drainage equipment of CBM well
DC microgrid
optimization and control
