Frequency Control Strategy for Interconnected Power Systems with Time Delay Considering Optimal Energy Storage Regulation

doi:10.16183/j.cnki.jsjtu.2022.145

Abstract

Abstract:

Aimed at the problem of large frequency deviation caused by the source load uncertainty and the communication delay in the interconnected power system, a frequency control strategy for interconnected power systems with time-delay considering energy storage regulation is proposed. An interconnected power grid model with time delay which includes a steam turbine generator, a wind turbine generator, and energy storage equipment is established. According to the area control error (ACE), the energy storage device coordinates the steam turbine generator to participate in the frequency control, and the modified particle swarm optimization (MPSO) algorithm is used to optimize the proportional integral derivative (PID) load frequency controller to realize the secondary frequency adjustment, which improves the frequency stability of the load frequency control (LFC) system in a certain time-delay interval. A fractional order PID (FOPID) controller is designed for the energy storage device to adjust the output power and smooth the source load fluctuation. The frequency control performance of the energy storage system is improved to further control the frequency deviation of the interconnected power system. Different working conditions are compared and analyzed on the MATLAB/Simulink platform to verify the effectiveness of the proposed frequency control strategy.

Key words: load frequency control (LFC), energy storage device, time-delay interconnected power system, modified particle swarm optimization (MPSO), fractional proportional integral derivative (FOPID)

CLC Number:

TM76

FU Yang, DING Zhiyin, MI Yang. Frequency Control Strategy for Interconnected Power Systems with Time Delay Considering Optimal Energy Storage Regulation[J]. Journal of Shanghai Jiao Tong University, 2022, 56(9): 1128-1138.

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参数	区域1	区域2
电力系统增益, K_p_i	120	166
电力系统时间常数, T_p_i/ s	20.2	33.3
发电机时间常数, T_t_i/ s	0.3	0.25
调速器时间常数, T_g_i/ s	0.08	0.1
调差系数, R_i	2.5	2.22
频率偏差系数, β_i	0.425	0.456
联络线功率系数, T_ij	0.272	0.272