An Equivalent Model for Frequency Dynamic Analysis of Large Power Grids Based on Regulation Performance Weighting Method

Junlong Zhang, Junchao Ma, Xuchen Yang, Jiajia Wang, Chenxu Wang and Yiping Yu ()
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Junlong Zhang: School of Electrical and Power Engineering, Hohai University, Nanjing 210098, China
Junchao Ma: State Grid Zhejiang Electric Power Co., Ltd., Research Institute, Hangzhou 310008, China
Xuchen Yang: School of Electrical and Power Engineering, Hohai University, Nanjing 210098, China
Jiajia Wang: School of Electrical and Power Engineering, Hohai University, Nanjing 210098, China
Chenxu Wang: State Grid Zhejiang Electric Power Co., Ltd., Research Institute, Hangzhou 310008, China
Yiping Yu: School of Electrical and Power Engineering, Hohai University, Nanjing 210098, China

Energies, 2024, vol. 17, issue 22, 1-17

Abstract: With the construction of the UHV (Ultra High Voltage) AC/DC hybrid power grid and the large-scale access to renewable energy such as wind power, frequency dynamic fluctuation has become a prominent problem affecting the safe and stable operation of large power grids. The expansion of the scale of the power system makes it impossible to use traditional fine modeling to analyze the power system. In order to reduce the calculation scale and storage capacity of power system frequency dynamic simulation, it is necessary to make appropriate equivalent simplification of the external system, so the appropriate dynamic equivalent method is of great significance. This paper mainly studies the equivalent model suitable for frequency dynamic analysis of large power grids. Firstly, the typical models of generator set and load are simplified, and the parameters that have a great influence on frequency in the simplified model are obtained through characteristic analysis. Then, a dynamic aggregation method of generator governor and prime mover parameters and load parameters based on regulation performance weighting (the parameters of the generator or load are weighted and summed according to its regulation ability on the system) is proposed. This method is applied to the simulation example of the East China Power Grid. The simulation proves that the frequency of the East China Power Grid before and after equivalence can be consistent under four different faults, which verifies the effectiveness of the equivalent method proposed in this paper in the frequency dynamic analysis of large power grids.

Keywords: frequency analysis; regulation performance weighting method; governor and prime mover equivalent; load equivalence (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2024
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