Hybrid energy storage system assisted frequency modulation simulation of the coal-fired unit under fuzzy control optimization

doi:10.19799/j.cnki.2095-4239.2021.0664

Abstract

Abstract:

Improved frequency modulation capacity of coal-fired thermal power units is one of the key strategies to fulfill the present frequency modulation demand of new energy in the power grid, in the context of rising grid-connected capacity of new energy. Consequently, the hybrid energy storage system composed of flywheel energy storage and electrochemical energy storage is an important technical means to enhance the frequency modulation performance of thermal power units. In Matlab/Simulink, a simulation model of a hybrid energy storage system to aid frequency modulation of coal-fired thermal power units is created, with the suggested control method confirmed and simulated for a 600 MW heat supply unit. The results demonstrate that the coupling hybrid energy storage system can effectively reduce the frequency variation of the power grid, reduce the output power fluctuation of the turbine, and stabilize the main steam pressure. The fuzzy control approach is utilized to optimize the power distribution coefficient in the hybrid energy storage system. The findings demonstrate that the fuzzy control method can keep the continuous charging/discharging process adaptable to power variations.

Key words: hybrid energy storage system, frequency modulation, modeling and simulation, load distribution, fuzzy control

CLC Number:

TM 921

Jianmin HAN, Feiyu XUE, Shuangyin LIANG, Tianshu QIAO. Hybrid energy storage system assisted frequency modulation simulation of the coal-fired unit under fuzzy control optimization[J]. Energy Storage Science and Technology, 2022, 11(7): 2188-2196.

Figures/Tables 20

Fig. 1

Table 1

Parameters of energy storage system"

主要参数	数值
飞轮转动惯量 $J$ /(kg·m²)	290
黏滞摩擦系数 $B$ /[N·m/(rad/s)]	0.0005
永磁磁链 $ψ$ /Wb	0.1286
极对数 $p$	2
惯性环节时间常数 $T p c s$	0.9

Table 1

Fig. 2

Fig. 3

Fig. 4

Table 2

Unit simulation parameters"

主要参数	数值
纯延迟时间常数 $τ$	40
燃烧通道时间常数 $T 1$	30
水冷壁时间常数 $T 2$	5
锅炉蓄热系数 $C d$	6010
主蒸汽管道蓄热系数 $C n$	660
高压蒸汽容积时间常数 $T h$	0.271
再热蒸汽容积时间常数 $T r$	13.212
低压蒸汽容积时间常数 $T l$	0.389
自然过调系数 $λ$	0.805
联络线同步系数 $T a b$	0.756
系统频率偏差系数 $B$	21
机组惯性常数 $M a / M b$	2.75/2
负荷单位调节率 $K D a / K D b$	10.5/12

Table 2

Fig. 5

Fig. 6

Fig. 7

Fig. 8

Fig. 9

Table 3

Table 4

Fig. 10

Fig. 11

Fig. 12

Fig. 13

Fig. 14

Fig. 15

Table 5

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X₁	X₂
X₁	NB	NS	ZO	PS	PB
NB	NS	NB	NB	NB	NB
NS	PS	NS	NS	NB	NB
ZO	PB	PB	PB	PB	PB
PS	PB	PB	PB	NS	PS
PB	PB	PB	PB	PB	NS

X₁	X₂
X₁	NB	NS	ZO	PS	PB
NB	PB	PB	PB	PB	PB
NS	PS	PB	PB	PB	PB
ZO	NB	NS	PB	PB	PB
PS	PS	PS	PS	PS	PS
PB	NB	NB	NB	NB	NS

项目		标准差
项目		无模糊控制	模糊控制优化
过充区	频率变化量(pu)/Hz	4.41×10^-5	4.19×10^-5
	输出功率变化量(pu)/MW	1.33×10^-3	1.05×10^-3
	主蒸汽压力(pu)/MPa	3.88×10^-5	2.52×10^-5
过放区	频率变化量(pu)/Hz	5.74×10^-5	5.48×10^-5
	输出功率变化量(pu)/MW	1.14×10^-3	9.23×10^-4
	主蒸汽压力(pu)/MPa	3.38×10^-5	2.13×10^-5

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