Secondary frequency modulation control strategy for large-scale grid-side energy storage devices in new power systems

doi:10.3969/j.issn.2097-0706.2024.02.008

Abstract

Abstract:

In view of the frequency fluctuation of the new power system caused by large-scale new energy grid connection, a secondary frequency modulation control strategy for grid-side energy storage devices is proposed, which takes the grid frequency modulation demand and batteries'frequency modulation capability into account. Based on the frequency modulation requirements of the power grid, the dual-signal adaptive switching control for the energy storage system in response to automatic power generation control instructions takes the advantages of the two frequency modulation signals，improving the frequency modulation command response capacity. Then, the frequency deviation can be controlled in a smaller range by this method. The proposed control strategy is verified by Matlab/Simulink, and the results show that the strategy, being able to suppress the frequency deviation, can effectively avoid overcharging and over-discharging of the energy storage system and maintain the SOC of each energy storage units.

Key words: new power system, automatic generation control, secondary frequency regulation, energy storage, fuzzy control, equalization control, state of charge

CLC Number:

TK01

SUN Na, DONG Haiying, CHEN Wei, MA Hulin. Secondary frequency modulation control strategy for large-scale grid-side energy storage devices in new power systems[J]. Integrated Intelligent Energy, 2024, 46(2): 59-67.

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参数	定义
ΔP_tie/MW	系统联络线功率偏差
ΔP_F1(s)/MW	传统电源一次调频出力
ΔP_G1(s)/MW	传统电源二次调频出力
ΔP_Bj(s)/MW	各储能单元二次调频出力
ΔP_S1(s)/MW	二次调频总出力
ΔP_L1(s)/MW	负荷增量
Δf₁(s)/Hz	频率偏差
K_I1	比例-积分（PI）控制器参数
K_P1	PI控制器参数
K₁	传统电源一次调频系数
G_g1(s)	传统电源机组模型
G_Bj(s)	储能系统模型
β₁	电力系统偏差系数
M₁	系统旋转惯量
D₁	系统阻尼系数
T₁₂	2个区域的容量延迟系数
a₁₂	2个区域的容量换算系数

	NB	NM	NS	ZO	PS	PM	PB
NB	NB	NB	NM	NM	NS	NS	NS
NM	NM	NM	NS	NS	ZO	ZO	ZO
NS	NM	NS	NS	ZO	ZO	ZO	PS
ZO	NS	ZO	ZO	PS	PS	PM	PM
PS	NS	ZO	ZO	PS	PS	PM	PM
PM	ZO	ZO	PS	PS	PM	PM	PB
PB	ZO	PS	PS	PM	PM	PB	PB

	NB	NM	NS	ZO	PS	PM	PB
NB	NB	NB	NM	NM	NS	ZO	ZO
NM	NB	NM	NM	ZO	ZO	ZO	PS
NS	NB	NM	NS	ZO	ZO	PS	PS
ZO	NS	NS	NS	ZO	PS	PS	PS
PS	NS	NS	ZO	ZO	PS	PS	PM
PM	NS	ZO	ZO	PS	PS	PM	PM
PB	NM	ZO	PS	PS	PM	PM	PB

储能系统	功率备用
储能单元1	-60~60
储能单元2	-50~50
储能单元3	-40~40
储能单元4	-30~30

参数	数值
M₁，M₂	10
D₁，D₂	1
β₁，β₂	-21
K_P1，K_P2	-0.822
K_I1，K_I2	-0.16
T_B	0.01
K_B	21
T_G	0.08
T_CH，T_RH	0.3，10.0
F_HP	0.5
T₁₂	1.59
a₁₂	0.2