Flywheel energy storage-thermal power mutual aid primary frequency modulation analysis based on process decomposition

doi:10.19799/j.cnki.2095-4239.2023.0138

Abstract

Abstract:

This study investigates the mutual primary frequency modulation between flywheel energy storage and thermal power systems. The frequency modulation model for a thermal power unit with a flywheel energy storage system is established, and the model is verified using real-world frequency modulation operational data. The study proposes that during operations with small frequency differences, only the flywheel can perform adaptive virtual droop control, which allows the flywheel to track the theoretical frequency modulation while maintaining the state of charge of the flywheel within a reasonable range. Furthermore, under conditions involving long duration or frequent frequency modulation in the same direction with large or small frequency differences, the thermal power unit can handle a large amount of basic regulation, while the flywheel is responsible for managing minor fluctuation. Additionally, the flywheel system can provide feedback and adjustments to facilitate fast self-recovery.

Key words: mutual aid, primary frequency modulation, adaptive virtual droop control, regurgitation regulation

CLC Number:

TM 921

Zhan LI, Lei LIU, Zhenyong YANG, Yong SHANG, Mo YO, Aiguo GAO, Jingqiu KANG. Flywheel energy storage-thermal power mutual aid primary frequency modulation analysis based on process decomposition[J]. Energy Storage Science and Technology, 2023, 12(9): 2854-2861.

Figures/Tables 14

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Table 1

Simulation parameters of thermal power units"

参数	数值
机组额定功率/MW	1000
额定压力/MPa	29.3
高压缸功率系数 $F H P$	0.3
中压缸功率系数 $F I P$	0.3
低压缸功率系数 $F L P$	0.4
高压缸容积时间常数 $T C H$ /s	0.3
中压缸容积时间常数 $T R H$ /s	10
低压缸容积时间常数 $T C O$ /s	0.5
发电机惯性常数 $H$	2
发电机负荷阻尼系数 $D$	12

Table 1

Table 2

Parameters of flywheel storage system"

参数	数值
飞轮额定容量/MW	7
飞轮额定功率充、放电时间/s	30
飞轮电机定子电阻 $R s / Ω$	0.097
永磁磁链 $ψ f$ /Wb	0.1286
黏滞摩擦系数 $B$ /( $N ∙ m ∙ s$ )	1100
定子电感 $L$ /H	2.085
极对数 $n p$	2
飞轮转动惯量 $J$ /( $k g ∙ m 2$ )	24.2

Table 2

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References 7

1	罗耀东, 田立军, 王垚, 等. 飞轮储能参与电网一次调频协调控制策略与容量优化配置[J]. 电力系统自动化, 2022, 46(9): 71-82.
	LUO Y D, TIAN L J, WANG Y, et al. Coordinated control strategy and optimal capacity configuration for flywheel energy storage participating in primary frequency regulation of power grid[J]. Automation of Electric Power Systems, 2022, 46(9): 71-82.
2	张汝峰. 飞轮储能辅助火电机组调频技术研究[D]. 北京: 华北电力大学, 2021.
	ZHANG R F. Research on frequency modulation technology of flywheel energy storage assisted thermal power unit[D].Beijing: North China Electric Power University, 2021.
3	何林轩, 李文艳. 飞轮储能辅助火电机组一次调频过程仿真分析[J]. 储能科学与技术, 2021, 10(5): 1679-1686.
	HE L X, LI W Y. Simulation of the primary frequency modulation process of thermal power units with the auxiliary of flywheel energy storage[J]. Energy Storage Science and Technology, 2021, 10(5): 1679-1686.
4	刘宇宸. 飞轮-蓄电池混合储能系统调频特性研究[D]. 北京: 华北电力大学,2021.
	LIU Y C. Study on frequency modulation characteristics of flywheel-battery hybrid energy storage system[D].Beijing: North China Electric Power University,2021.
5	秦昊, 秦立军, 白雪辰, 等. 辅助抽水蓄能调频的飞轮控制策略[J]. 储能科学与技术, 2022, 11(12): 3915-3925.
	QIN H, QIN L J, BAI X C, et al. Flywheel control strategy for frequency modulation of auxiliary pumped storage[J]. Energy Storage Science and Technology, 2022, 11(12): 3915-3925.
6	洪烽, 梁璐, 逄亚蕾, 等. 基于自适应协同下垂的飞轮储能联合火电机组一次调频控制策略[J]. 热力发电, 2023, 52(1): 36-44.
	HONG F, LIANG L, PANG Y L, et al. Primary frequency modulation control strategy of flywheel energy storage combined thermal power unit based on adaptive cooperative droop[J]. Thermal Power Generation, 2023, 52(1): 36-44.
7	隋云任, 梁双印, 黄登超, 等. 飞轮储能辅助燃煤机组调频动态过程仿真研究[J]. 中国电机工程学报, 2020, 40(8): 2597-2606.
	SUI Y R, LIANG S Y, HUANG D C, et al. Simulation study on frequency modulation process of coal burning plants with auxiliary of flywheel energy storage[J]. Proceedings of the CSEE, 2020, 40(8): 2597-2606.

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