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| 摘要: |
| 总结了电力系统稳定性分析中高压直流输电系统的一般性建模方法;讨论了直流模型的分类及模型的适用性;分析了常用商用电力系统分析软件中的直流模型,建议开发商适当增加内置直流模型与用户自定义模块间的接口,以拓展直流模型的适用范围;重点分析了基于采样数据建模方法和动态相量理论对直流换流器准稳模型的改进。认为采样数据建模方法建立了适合于电力系统次同步振荡研究的换流器小信号模型,但不能用于电力系统暂态稳定仿真计算中;动态相量法推导了换流器的大信号模型,但仍不能正确反映换相失败现象和不对称工作条件下高压直流系统的动态行为。认为在大规模交直流电力系统的暂态稳定性研究中,机电-电磁混合仿真思路较有潜力,而其关键问题在于各种扰动下电磁暂态仿真范围的合理确定。 |
| 关键词: 高压直流,建模,采样数据法,动态相量法 |
| DOI： |
| 分类号:TM711 |
| 基金项目:国家自然科学基金重点项目(50337010)~~ |
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| Survey on HVDC system modeling |
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MAO Xiao-ming ZHANG Yao ZHANG Yan
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| Abstract: |
| The general HVDC(High Voltage Direct Current) modeling methods in power system stability study are summarized and the classifications of HVDC models are discussed with their applicability.The HVDC models used in commercial power system analysis software packages are studied and it is suggested to add the interface between the embedded model and user-defined block for widening the application range.The improvements of DC converter quasi-steady model by sampled data approach and dynamic phasor theory are emphasized.It is indicated that,the small-signal model established by sampled data approach suitable for sub-synchronous oscillation studies could not be used to power system transient stability simulation and the large-signal model developed by dynamic phasor theory could not precisely reflect commutation failures and the dynamic performance of HVDC system under asymmetrical working conditions.It is pointed out that,the hybrid electromechanical and electromagnetic simulation is more potential and its key technique is the determination of proper simulation ranges under various disturbances. |
| Key words: HVDC,modeling,sampled data approach,dynamic phasor theory |
