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浙江大学电气工程学院,浙江省杭州市 310027
Received:27 November 2023,
Revised:2024-02-23,
Published Online:18 April 2024,
Published:25 April 2025
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刘晨曦,辛焕海.考虑实际工况的新能源多馈入系统广义运行短路比[J].电力系统自动化,2025,49(8):12-20.
LIU Chenxi,XIN Huanhai.Generalized Operational Short-circuit Ratio of Multi-infeed Systems with Renewable Energy Considering Actual Operation Conditions[J].Automation of Electric Power Systems,2025,49(8):12-20.
刘晨曦,辛焕海.考虑实际工况的新能源多馈入系统广义运行短路比[J].电力系统自动化,2025,49(8):12-20. DOI: 10.7500/AEPS20231127003.
LIU Chenxi,XIN Huanhai.Generalized Operational Short-circuit Ratio of Multi-infeed Systems with Renewable Energy Considering Actual Operation Conditions[J].Automation of Electric Power Systems,2025,49(8):12-20. DOI: 10.7500/AEPS20231127003.
随着新能源的发展,新能源多馈入系统电压支撑强度逐渐降低,亟需强度评估方法。考虑设备均在额定运行点,利用现有电网强度指标及临界值即可实现强度的准确量化;而设备实际运行工况各异且复杂多变,破坏了现有指标定义条件,导致现有方法失效。为此,聚焦于实际工况下的系统电压支撑强度量化问题,基于特征子空间摄动理论,求解了能够近似表征实际系统稳定性的等效单馈入系统。在此基础上,给出了广义运行短路比的定义及物理意义,从而利用广义运行短路比和设备临界运行短路比严谨地量化实际工况下的强度。此外,揭示了不同稳定形态下实际工况对强度的具体作用机理。最后,利用算例验证了所提方法的有效性。
With the development of renewable energy
the voltage support strength of multi-infeed systems with renewable energy is gradually decreasing
and there is an urgent need for strength evaluation methods. Considering that devices are all at the rated operation condition points
accurate quantification of strength can be achieved by utilizing existing power grid strength indices and threshold. However
the actual operation conditions of devices are diverse and complex
which disrupts the existing criteria for defining indices and causes existing methods to fail. Therefore
this paper focuses on the quantification problem of voltage support strength under actual operation conditions. Based on the perturbation theory of eigen-subspaces
an equivalent single-infeed system that can approximately characterize the stability of the actual system is solved. On this basis
the definition and physical significance of the generalized operational short-circuit ratio are provided
so as to rigorously quantify the strength under actual operation conditions using the generalized operational short-circuit ratio and the critical operational short-circuit ratio for devices. In addition
this paper reveals the specific mechanism of the actual operation conditions on strength with different stable forms. Finally
the effectiveness of the proposed method is verified through cases.
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