混合双馈入直流输电系统控制回路间交互影响定量分析

随着直流工程建设的推进,混合双馈入直流输电系统内部的交互影响受到愈来愈多的关注.为进一步明确混合双馈入直流输电系统内部交互影响的产生机理,利用控制理论中的相对增益矩阵方法对混合双馈入直流输电系统控制回路间的耦合作用进行定量分析.研究受端交流系统强度、联络线长度、直流功率传输水平以及直流系统功率振荡频率等多种因素对控制回路间耦合程度的影响.最后利用电磁暂态仿真模型进行验证,证明了所提方法能够定量分析混合双馈入直流输电系统内部交互影响的产生机理.

Quantitative analysis of interaction between different control loops in hybrid dual-infeed HVDC system

With the development of HVDC(High Voltage Direct Current) projects, the interaction within hybrid dual-infeed HVDC system has attracted extensive attention. In order to further clarify the internal interaction mechanism of hybrid dual-infeed HVDC system, quantitative analysis of coupling effect between different control loops in hybrid dual-infeed HVDC system is investigated through relative gain array method in control theory. Then, the effects of factors such as the AC system strength, tie-line length, HVDC power transmission level and power oscillation frequency of DC system on coupling degree between different control loops are studied. Finally, the electromagnetic transient simulation model is built to verify that the proposed method can quantitatively analyze the generation mechanism of interaction within hybrid dual-infeed HVDC system.