Adaptive Droop Control Strategy Considering Frequency Modulation Dead Band of Hybrid Energy Storage

doi:10.11985/2021.04.027

Abstract

Abstract:

In order to optimize the hybrid energy storage participating in the primary frequency regulation of power grid, an adaptive droop control strategy considering the dead band of hybrid energy storage is proposed. According to the characteristics of each energy storage element, in order to give full play to its role, the frequency regulation dead zone of the hybrid energy storage is set in the thermal power unit, and the frequency regulation dead zone of the super capacitor is set in the battery, which can not only improve the frequency regulation effect, but also effectively reduce the frequent action of the thermal power unit. Then, based on the Logistic function, the relationship between the state of charge (SOC) of energy storage equipment and the droop coefficient is established, and the adaptive droop control strategy is used to participate in the primary frequency regulation of power grid, to effectively prevent the energy storage equipment from overcharging or discharging; Finally, Matlab/Simulink is used for simulation, and the results show that the proposed control strategy can effectively improve the frequency regulation effect, improve the frequency quality and stabilize the state of charge of energy storage equipment.

Key words: Hybrid energy storage, dead band, primary frequency regulation, adaptive droop control, state of charge

CLC Number:

TM732

FANG Hongyan, MA Ping. Adaptive Droop Control Strategy Considering Frequency Modulation Dead Band of Hybrid Energy Storage[J]. Journal of Electrical Engineering, 2021, 16(4): 213-222.

Figures/Tables 14

References 20

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仿真参数	仿真取值	仿真参数	仿真取值
K_G	25	M	10
T_G	0.3	D	2
F_HP	0.5	T_SC	0.2
T_RH	10	T_B	0.3
T_CH	0.3

调频死区		$RM{S_f}$	$RM{S_{SOC{\rm{ - }}SC}}$	$RM{S_{SOC{\rm{ - }}B}}$	火电机组出力时间比例(%)	$\left\| {\Delta {P_G}} \right\|$/p.u.
超级电容	蓄电池	$RM{S_f}$	$RM{S_{SOC{\rm{ - }}SC}}$	$RM{S_{SOC{\rm{ - }}B}}$	火电机组出力时间比例(%)	$\left\| {\Delta {P_G}} \right\|$/p.u.
20%DB	20%DB	0.012 0	0.135 1	0.088 9	0	0
	40%DB	0.015 5	0.166 4	0.070 5	0	0
	60%DB	0.019 1	0.186 9	0.061 9	0	0
	80%DB	0.022 6	0.197 6	0.050 6	47.99	0.005 7
	100%DB	0.023 8	0.204 2	0.026 2	58.84	0.032 6
40%DB	40%DB	0.017 7	0.131 6	0.085 1	0	0
	60%DB	0.021 0	0.162 8	0.062 3	0	0
	80%DB	0.024 6	0.184 3	0.050 3	47.39	0.003 9
	100%DB	0.026 9	0.194 9	0.026 4	60.91	0.032 8
60%DB	60%DB	0.023 2	0.126 0	0.080 1	0	0
	80%DB	0.026 7	0.159 2	0.054 0	89.93	0.002 9
	100%DB	0.028 9	0.176 0	0.025 0	91.66	0.051 9
80%DB	80%DB	0.028 7	0.114 3	0.071 0	98.73	0.026 7
80%DB	100%DB	0.030 5	0.147 9	0.028 7	98.94	0.088 7
100%DB	100%DB	0.032 2	0.070 1	0.047 7	99.36	0.158 5

调频方法	Δf/Hz	t_m/s	Δt/s	$\left\| {{v_m}} \right\|$/(Hz/s)
无储能	-0.269 5	3.018	2.018	0.133 5
现有策略	-0.101 5	1.721	0.721	0.140 7
本文策略	-0.057 2	1.907	0.907	0.063 1