Abstract
Battery energy storage systems (BESSs) with proportional-integral (PI) control methods have been widely studied in microgrids (MGs). However, the performance of PI control methods might be unsatisfactory for BESSs due to the nonlinear characteristics of the system. To overcome this problem, an energy-based (EB) control method is applied to control the converter of a BESS in this study. The EB method is a robust nonlinear control method based on passivity theory with good performance in both transient and steady states. The detailed design process of the EB method in the BESS by adopting an interconnection and damping assignment (IDA) strategy is described. The design process comprises three steps: the construction of the port-controlled Hamiltonian model, the determination of the equilibrium point and the solution of the undetermined matrix. In addition, integral action is combined to eliminate the steady state error generated by the model mismatch. To establish the correctness and validity of the proposed method, we implement several case simulation studies based on a test MG system and compare the control performance of the EB and PI methods carefully. The case simulation results demonstrate that the EB method has better tracking and anti-disturbance performance compared with the classic PI method. Moreover, the proposed EB method shows stronger robustness to the uncertainty of system parameters.
Highlights
The installation of a battery energy storage system (BESS) in a microgrid (MG) provides a variety of MG services such as compensating for fluctuations in renewable power generation sources, voltage support, and frequency regulation [1,2,3,4,5]
Since the PI method design is usually based on a local linearization model or linear controller with compensation, it can only achieve reliable performance and stability in a certain range for BESS converter control [10]
Simple serves to directly interface the battery with the MG. This BESS topology can apply to AC MGs with single-stage structure is employed, which means that just one voltage-source converter (VSC) is utilized
Summary
The installation of a battery energy storage system (BESS) in a microgrid (MG) provides a variety of MG services such as compensating for fluctuations in renewable power generation sources, voltage support, and frequency regulation [1,2,3,4,5]. Since the PI method design is usually based on a local linearization model or linear controller with compensation, it can only achieve reliable performance and stability in a certain range for BESS converter control [10]. Various nonlinear control methods have been applied to the voltage-source converter (VSC) such as hysteresis control [12], sliding-mode control [13], backstepping design method [14], one-cycle control [15], and fuzzy control [16] These methods can achieve stronger robustness and a larger stability range compared with PI control.
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