Abstract
To enhance the quality of output power from regional interconnected power grid and strengthen the stability of overall system, a hybrid energy storage system (HESS) is applied to traditional multi-area interconnected power system to improve the performance of load frequency control. A novel topology structure of interconnected power system with the HESS is proposed. Considering the external disturbances of the system and the interconnected factors between each control area, the dynamic mathematical model of each area in the new topology is established in the form of state-space equation. Combining the state feedback robust control theory with linear matrix inequality (LMI) theory, the controller is designed to calculate how much power the HESS should provide to power grid in real time, according to the load change of system. Taking the four-area interconnected power system as study object, the simulation results obtained by MATLAB prove that the application of HESS can well improve the frequency stability of multi-area interconnected system and the H∞ robust controller proposed in this paper is effective.
Highlights
With the rapid development of new energy generation technologies such as photovoltaic power generation, wind power generation, et cetera, as well as user’s growing requirement of power quality and power supply reliability, power system has changed from the traditional centralized large power grid to the multi-area interconnected power system [1]
The load frequency control (LFC) is an important part of the automatic power generation control (AGC) in power system and the function of the LFC is to ensure the stability of power system load frequency [4,5]
The uncertainty caused by the variation of governor and turbine parameters is considered in [14], and an adaptive model predictive control (AMPC) method is applied to the LFC controller for multi-area power systems which can change the object model in MPC structure online
Summary
With the rapid development of new energy generation technologies such as photovoltaic power generation, wind power generation, et cetera, as well as user’s growing requirement of power quality and power supply reliability, power system has changed from the traditional centralized large power grid to the multi-area interconnected power system [1]. The chaos optimization algorithm is used to adjust the multi-area load frequency control PID controller in [11]. The uncertainty caused by the variation of governor and turbine parameters is considered in [14], and an adaptive model predictive control (AMPC) method is applied to the LFC controller for multi-area power systems which can change the object model in MPC structure online. Through the analysis and comparison of simulation results from PID control, it is identified that the H∞ controller can improve the stability of power frequency under external load disturbance and the HESS can convert the output power demand signal from the H∞ controller into the corresponding power flow effectively.
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