Primary Frequency Modulation Control of DFIG Based on Optimization and Coordination of Overspeed and Variable Paddle

doi:10.16628/j.cnki.2095-8188.2021.10.004

Abstract

Abstract:

With the increasing of the grid-connected capacity of wind power,the new energy generation system puts forward higher requirements for wind power to participate in frequency modulation.Because the doubly-fed wind turbines the active power and frequency are decoupled,the active standby power supporting the grid frequency control cannot be provided.Therefore,load reduction is carried out and part of active power is reserved in advance as standby for frequency modulation.However,overspeed and paddle change control have certain limitations under different wind conditions.In this paper,a primary frequency modulation control strategy based on optimal coordination of overspeed and variable paddle is proposed to adapt to the full wind speed condition.The optimal combination of overspeed and variable paddle is studied to adjust and coordinate controller parameters under different wind conditions to release standby power stably.The simulation results show that the optimization and coordination control method proposed in this paper has better frequency modulation performance than the existing method,can reduce wind abandon better.

Key words: doubly fed induction generator (DFIG), primary frequency modulation, variable paddle and overspeed, optimization and coordination

CLC Number:

TM315

ZHANG Liusheng, XIE Zhen, Xu Kebao, ZHANG Xing. Primary Frequency Modulation Control of DFIG Based on Optimization and Coordination of Overspeed and Variable Paddle[J]. LOW VOLTAGE APPARATUS, 2021, 0(10): 18-27.

Figures/Tables 18

v/(m·s^-1)	β/(°)	K_β	$ω mppt *$ /p.u.	ω_mppt/p.u.	K_β
6.0	0	0	0.87	0.81	1.50
6.5	0	0	0.94	0.87	1.75
7.0	0	0	1.01	0.95	1.78
7.5	0	0	1.08	1.01	1.83
7.9	0	0	1.14	1.07	1.90
8.5	2.3	11.5	1.20	1.15	1.25
9.3	2.8	14.0	1.20	1.18	0.50
9.7	3.0	15.0	1.20	1.20	0
10.0	2.1	10.5	1.20	1.20	0
11.0	1.7	8.5	1.20	1.20	0

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参数	数值
双馈风机额定功率/MW	2.0
额定风速/(m·s^-1)	12
发电机定子电阻/mΩ	7.8
定子d轴电感/H	1.42
定子q轴电感/H	2.75
发电机极对数	2
负荷1/WM	0.2
直流电压/V	1 100
网侧逆变器电感/mH	0.15e-3
网侧逆变器电容/μF	500e-6
同步电机额定功率/MW	2
同步电机额定电压/V	400
同步电机极对数	2
Z₁	(0.682+j0.483)%
Z₂	(1.432+j0.967) %
Z₃	(0.682+j0.241)%