Impact of inertia and effective short circuit ratio on control of frequency in weak grids interfacing LCC-HVDC and DFIG-based wind farms
Impact of inertia and effective short circuit ratio on control of frequency in weak grids interfacing LCC-HVDC and DFIG-based wind farms
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DOI：
10.1109/tpwrd.2016.2607205
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发表时间：
2017-08
期刊：
影响因子：
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通讯作者：
Amirthagunaraj Yogarathinam;Jagdeep Kaur;N. Chaudhuri
中科院分区：
文献类型：
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作者：
Amirthagunaraj Yogarathinam;Jagdeep Kaur;N. Chaudhuri
尽管几乎每条架空高压直流线路都基于LCC技术，但在连接LCC-HVDC和陆上dfige风电场的弱电网中，对惯性和有效短路比对频率控制的影响进行建模和分析的工作几乎没有报道。本文开发了一个综合的弱电网建模和稳定性分析框架，该框架连接了LCC-HVDC站和基于dfig的风电场。为此，推导了系统的非线性平均相量模型，然后将其与详细的开关模型进行基准测试。对平均模型进行线性化处理，设计了LCC-HVDC整流站的频率控制器。参与因子和特征值灵敏度测量表明，交流系统机电模式和“高压直流锁相环”模式分别对直流有效惯性常数和有效短路比的变化高度敏感。根位点分析在逐步弱网格验证了这些结果。对频率控制器参数的系统设计过程表明，“发电机转速-高压直流锁相环-频率控制器”模式与“DFIG-GSC控制器”模式之间存在负交互作用。
Although virtually every overhead HVDC line is based on LCC technology, hardly any work has been reported on modeling and analysis of the impact of inertia and effective short circuit ratio on control of frequency in weak grids interfacing LCC-HVDC and onshore DFIG-based wind farms. This paper develops a comprehensive modeling and stability analysis framework of a weak grid that interfaces an LCC-HVDC station and a DFIG-based wind farm. To that end, a nonlinear averaged phasor model of the system is derived, which is then benchmarked against a detailed switched model. The averaged model is linearized to design a frequency controller for the LCC-HVDC rectifier station. Participation factor and eigenvalue sensitivity measures indicate that the AC system electromechanical mode and the ‘HVDC PLL’ mode are highly sensitive to changes in Effective DC Inertia Constant and Effective Short Circuit Ratio, respectively. Root-locus analysis in a progressively weak grid validates these results. A systematic design process of the frequency controller parameters reveals a negative interaction between the ‘generator speed-HVDC PLL-frequency controller’ mode and the ‘DFIG-GSC controller’ mode.