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1.四川大学电气工程学院,四川省成都市 610044
2.国网江苏省电力有限公司电力科学研究院,江苏省南京市 211103
陈湘(1998—),男,硕士研究生,主要研究方向:电力系统频率稳定性分析与控制。E-mail:1165031333@qq.com
付强(1993—),男,通信作者,博士,副研究员,硕士生导师,主要研究方向:新能源、柔性直流系统稳定性分析与控制。E-mail:fuqiang346@qq.com
宾子君(1991—),男,博士,工程师,主要研究方向:电力系统稳定与控制。E-mail:binzijun@gmail.com
收稿:2023-07-13,
修回:2023-11-18,
网络出版:2024-03-20,
纸质出版:2024-04-25
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陈湘,付强,宾子君等.附加频率控制下并网换流器的动态惯量及其量化评估[J].电力系统自动化,2024,48(8):131-140.
CHEN Xiang,FU Qiang,BIN Zijun,et al.Dynamic Inertia of Grid-connected Converter with Additional Frequency Control and Its Quantitative Evaluation[J].Automation of Electric Power Systems,2024,48(8):131-140.
陈湘,付强,宾子君等.附加频率控制下并网换流器的动态惯量及其量化评估[J].电力系统自动化,2024,48(8):131-140. DOI: 10.7500/AEPS20230713004.
CHEN Xiang,FU Qiang,BIN Zijun,et al.Dynamic Inertia of Grid-connected Converter with Additional Frequency Control and Its Quantitative Evaluation[J].Automation of Electric Power Systems,2024,48(8):131-140. DOI: 10.7500/AEPS20230713004.
新能源大规模并网显著降低了交流系统惯量,并网换流器参与频率控制成为提升频率稳定性的重要手段。基于传递函数模型推导了附加频率控制下并网换流器的动态惯量,发现其受惯量设计参数和其他控制环节的共同影响,呈现时变特性,但是将其简化为与同步发电机旋转惯量类似的常数会导致分析误差。为此,面向定直流电压控制和定功率控制这两类主流的并网换流器控制方式,提出了附加频率控制下并网换流器动态惯量的量化评估方法,分析了控制参数、运行工况和系统特性等不同因素对惯量的影响机制,得到了有功控制外环会显著改变原有设计惯量的结论,需重点关注其控制参数导致的惯量偏差。最后,基于在Simulink中搭建的时域仿真模型,验证了所提传递函数模型及惯量量化评估方法的正确性和有效性。
The large-scale integration of renewable energy significantly reduces the inertia of the AC system
and the participation of grid-connected converters in the frequency control has become an important means to improve frequency stability. Based on the transfer function model
the dynamic inertia of grid-connected converter with additional frequency control is derived. It is observed that the dynamic inertia exhibits time-varying characteristics due to the combined influence of inertia design parameters and other control elements. However
simplifying it to a constant similar to the rotational inertia of synchronous generators will lead to analysis errors. Therefore
for the two mainstream grid-connected converter control methods of constant DC voltage control and constant power control
the quantitative evaluation method of dynamic inertia for grid-connected converter with additional frequency control is proposed. The influence mechanisms of different factors such as control parameters
operation conditions
and system characteristics on inertia are analyzed. It is concluded that the outer loop of active power control will significantly change the original design inertia
and it is necessary to focus on the inertia deviation caused by its control parameters. Finally
based on the time-domain simulation model built in Simulink
the correctness and effectiveness of the transfer function model and quantitative evaluation method of inertia are verified.
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