Shaft modeling and oscillation analysis for expansion process of compressed air energy storage system

doi:10.19799/j.cnki.2095-4239.2021.0443

Abstract

Abstract:

The compressed air energy storage (CAES) system has broad application prospects with the characteristics of large capacity, extended cycle life, fast response, and flexible adjustment. The expansion process of a compressed air storage system is the intermediary process from pressure energy to mechanical energy and electricity. The shaft modeling and oscillation analysis are different from traditional synchronous generating units, wind turbines, and micro gas turbines. To study the shaft oscillation characteristics of CAES for analyzing the power system stability, this study focuses on a typical four-stage expansion CAES power generation system structure, establishes a segmented concentrated mass spring model of its shaft, and derives a system shafting standard model. For a certain example system with a capacity of 10 MW, the inherent characteristics of the shafting system were evaluated, and the natural oscillation frequency and oscillation mode were obtained. The stability analysis of the shafting system was performed from the grid side and the expander side, respectively. Based on the oscillation characteristics of the shafting system, the potential oscillation forms of the system are categorized into three types: shock oscillation, sub-synchronous oscillation, and super-synchronous oscillation. Principle analysis and simulation verification of each oscillation type are performed, and the corresponding suppression method is proposed according to the characteristics of each oscillation type.

Key words: compressed air energy storage system, power system stability, modelling of the shafting system, shaft torsional oscillation, suppression strategy

CLC Number:

TK 02

Di LIU, Tiantian ZHANG, Yuwei PENG, Xiaomei TANG, Dan WANG, Chengxiong MAO. Shaft modeling and oscillation analysis for expansion process of compressed air energy storage system[J]. Energy Storage Science and Technology, 2022, 11(2): 563-572.

Figures/Tables 16

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质量块	转动惯量/[J/(kg·m²)]	惯性时间常数M^*/s
#1	70.08	15.3703
#2	73	7.8452
#3	78.84	2.7666
#4	105.12	1.4410
GEAR	763.51	0.9421
GEN	2365	2.9177

轴段	刚度系数K/(N·m/rad)	刚度系数K^*/(pu torque/rad)
#1-GEAR	4.08×10⁶	854.5132
#2-GEAR	4.08×10⁶	598.1592
#3-GEAR	2.04×10⁶	170.9026
#4-GEAR	2.04×10⁶	106.8142
GEN-GEAR	2.448×10⁶	38.4531

固有振荡频率/Hz	#1	#2	#3	#4	GEAR	GEN
5.37	-1.37	-0.96	-0.56	-0.36	-0.10	1
22.50	-372	-266	-429	2055	-18.30	1
26.43	-650	-472	2081	203	-25.64	1
37.88	-26728	36516	241	93.31	-53.74	1
200.00	778	522	135	63	-1525	1

固有振荡频率/Hz	T_t1	T_t2	T_t3	T_t4	T_t5
5.37	42	36.2	27.3	21.8	47.4
22.50	-8.17	-13.8	-13.9	-1.85	-25.3
26.43	5.69	0.182	8.87	-12.9	-28.4
37.88	-0.39	-0.419	-48.2	-58	-34.6
200.00	1.64	-4.57	-20.5	-28.7	-48

输入量	主导模态/Hz	次主导模态/Hz
T_em T_m1	5.37 37.88	26.43 26.43
T_m2	37.88	26.43
T_m3	26.43	22.50
T_m4	22.50	26.43