Small-Signal Modeling and Frequency Support Capacity Analysis of Power Load Considering Voltage Variation Effect

被引:0
|
作者
Zhou, Tao [1 ,2 ]
Zheng, Yuxin [1 ]
Wang, Cheng [1 ]
Chen, Lei [2 ]
Liu, Bo [3 ]
Chen, Zhong [3 ]
机构
[1] Nanjing Univ Sci & Technol, Sch Automat, Nanjing 210094, Peoples R China
[2] Tsinghua Univ, State Key Lab Power Syst Operat & Control, Beijing 100084, Peoples R China
[3] Southeast Univ, Sch Elect Engn, Nanjing 210096, Peoples R China
来源
SYMMETRY-BASEL | 2024年 / 16卷 / 07期
关键词
active power symmetry; frequency response modeling; dynamic load; static load; voltage variation effect;
D O I
10.3390/sym16070918
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
The frequency support capacity of power loads is essential for maintaining active power symmetry and balance between the generation and demand sides of power systems. As the proportion of renewable energy sources and power electronic equipment increases, the inertia on the power generation side decreases, highlighting the growing importance of frequency support on the load side. As it is generally believed that the active power balance of power systems determines the frequency stability, few studies have considered the effect of voltage variation on the frequency response dynamics. It is important to note that the node voltage keeps fluctuating throughout the frequency dynamic process, which affects the active power of loads and should not be neglected. Based on the aforementioned rationales, this paper endeavors to investigate the modeling of power load frequency response and analyze its support capability considering the voltage variation effect. This paper initially establishes the small-signal model of dynamic load under frequency dynamics, derives the transfer function relating active power to system frequency deviation, and subsequently develops its frequency response model. Subsequently, commencing with the ZIP model of static load, the power fluctuation of load nodes is derived from the influence of preceding nodes, and the frequency response model of the static load is formulated and its frequency support capacity is scrutinized. Based on this foundation, a comprehensive aggregation model of the complex load is constructed, and its frequency support capability is assessed using actual data. Finally, the proposed model and analysis results are validated through simulation, confirming their correctness and effectiveness.
引用
收藏
页数:25
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