火电机组直流孤岛系统频率控制分析与系统试验

发布时间：2018-09-04 17:30

【摘要】：火电直流孤岛系统转动惯量小、交流网架薄弱,系统频率稳定问题突出,由此带来的系统运行和设备安全风险较大,而国际上也没有先例可循。该文通过分析火电机组一次调频、调速系统和直流系统的频率特性,依据实测数据建立精确反映火电直流孤岛系统频率特性完整的传递函数。基于根轨迹分析,给出直流附加控制策略、机组一次调频和汽轮机参数对孤岛系统稳定性的影响,及相关参数的优化取值范围。研究结论为世界上首次进行的火电直流孤岛运行试验伊穆直流孤岛特性系统试验提供了坚实理论依据和工作支撑,现场试验结果与理论分析和仿真完全一致。该文提出的研究方法为后续特高压直流工程建设和运行中可能出现的孤岛运行方式的选择奠定了理论基础,为大型火电基地的集中开发和远距离外送提供了一定技术依据。
[Abstract]:The moment of inertia of DC isolated island system of thermal power is small, the AC grid is weak, and the problem of system frequency stability is prominent. The system operation and equipment safety risk is great, and there is no precedent in the world. Based on the analysis of the frequency characteristics of primary frequency modulation, speed regulating system and DC system of thermal power unit, a transfer function which accurately reflects the complete frequency characteristics of DC isolated island system of thermal power plant is established according to the measured data. Based on the root locus analysis, the additional DC control strategy, the influence of primary frequency modulation and turbine parameters on the stability of isolated island system, and the optimal range of related parameters are given. The research results provide a solid theoretical basis and working support for the first thermal power DC islanding operation test in the world, and the field test results are in good agreement with the theoretical analysis and simulation. The research method proposed in this paper lays a theoretical foundation for the selection of isolated island operation modes that may occur in the construction and operation of UHVDC projects, and provides a certain technical basis for the centralized development and long-distance delivery of large thermal power bases.
【作者单位】：华北电力大学电气与电子工程学院;中国电力科学研究院;
【分类号】：TM621

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