Application of Adaptive Fuzzy Nonlinear Control with Variable Universe in Liquid Level Control of Steam Generator

doi:10.16183/j.cnki.jsjtu.2021.235

Abstract

Abstract:

Aimed at the important position of the steam generator liquid level control system in maintaining the safe and efficient operation of the power plant in the PWR nuclear power plant, and the fact that there exist strong nonlinear characteristics in the controlled object of the steam generator liquid level under different load sections and changing conditions, this paper proposes a fuzzy control algorithm with the adaptive variable universe function. Based on the general fuzzy control algorithm, the Lyapunov function is constructed through the nonlinear system model, and the optimal adaptive expansion factor is solved based on the ideal control law, and Lyapunov theorem is used to prove the stability of the control system. The simulation results show that the fuzzy control with adaptive variable universe function can better effectively control the liquid level of the steam generator under different working conditions and variable working conditions than the traditional proportional integral (PI) control and fuzzy PI control. The problem of controller overrun is solved, and the system has a better robustness.

Key words: steam generator, level control, variable universe algorithm, fuzzy control

CLC Number:

QIAN Hong, ZOU Mingyao. Application of Adaptive Fuzzy Nonlinear Control with Variable Universe in Liquid Level Control of Steam Generator[J]. Journal of Shanghai Jiao Tong University, 2023, 57(1): 116-126.

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e_c	ΔK_p/ΔK_i
e_c	e(NB)	e(NN)	e(NS)	e(ZO)	e(PS)	e(PM)	e(PB)
NB	PB/NB	PB/NB	PM/NM	ZO/NM	PS/NS	ZO/ZO	ZO/ZO
NM	PB/NB	PB/NB	PM/NM	ZO/NS	PS/NS	ZO/ZO	NS/ZO
NS	PM/NB	PM/NM	PM/NS	PS/NS	ZO/ZO	NS/PS	NS/PS
ZO	PM/NM	PM/NM	PS/NS	ZO/ZO	NS/PS	NM/PM	NM/PM
PS	PS/NM	PS/NS	ZO/ZO	NS/PS	NS/PS	NM/PM	NM/PB
PM	PS/ZO	ZO/ZO	NS/PS	ZO/PS	NM/PM	NM/PB	NB/PB
PB	ZO/ZO	ZO/ZO	NM/PS	ZO/PM	NM/PM	NB/PB	NB/PB

额定功率点	G₁	G₂	G₃	τ₁/s	τ₂/s	T/s	q_ν/(kg·s^-1)
5%P_R	0.058	9.63	0.181	41.9	48.4	119.6	57.4
15%P_R	0.058	4.46	0.226	26.3	21.5	60.5	180.8
30%P_R	0.058	1.83	0.310	43.4	4.5	17.7	381.8
50%P_R	0.058	1.05	0.215	34.8	3.6	14.2	660.0
100%P_R	0.058	0.47	0.105	28.6	3.4	11.7	1 435.0

控制器	σ/%
控制器	5%P_R	15%P_R	30%P_R	50%P_R	100%P_R
PI控制	47.2	19.3	37.1	27.8	17.2
模糊PI控制	24.5	14.2	18.6	22.8	11.3
变论域模糊控制	6.5	3.2	1.4	17.7	2.5

控制器	T_s/s
控制器	5%P_R	15%P_R	30%P_R	50%P_R	100%P_R
PI控制	1 694	610	290	238	110
模糊PI控制	1 560	594	243	192	103
变论域模糊控制	1 100	470	152	138	75

控制器	ζ/mm
控制器	5%P_R	15%P_R	30%P_R	50%P_R	100%P_R
PI控制	43.2	21.7	19.7	12.7	7.83
模糊PI控制	36.5	17.5	13.8	10.6	5.39
变论域模糊控制	28.6	15	9.8	9.1	4.56