A Digital Current Control Technique for Grid-Connected AC/DC Converters Used for Energy Storage Systems

作者：Eren Suzan^*; Pahlevani Majid; Bakhshai Alireza; Jain Praveen

来源：IEEE Transactions on Power Electronics, 2017, 32(5): 3970-3988.

DOI：10.1109/TPEL.2016.2582901

• AC/DC converter
• adaptive control
• bidirectional converter
• energy storage systems (ESS)
• fast manifold
• grid-connected converter
• hybrid renewable energy systems
• micro/nano-grid
• nonlinear control
• slow manifold
• smart grid

This paper presents an advanced current controller for grid-connected bidirectional ac/dc converters used for energy storage systems (ESSs). The proposed control scheme is designed to incorporate both the time-domain and frequency-domain dynamics to achieve superior transient and steady-state performance. The advanced current controller can overcome the various challenges faced by the conventional current controllers used in this application, which lead to sluggish transients and steady-state errors when tracking the sinusoidal reference for the grid current. Combining the time-domain dynamics with the frequency-domain dynamics creates a more intelligent controller compared to existing-methods, which only consider the dynamics of one domain. The proposed controller is able to eliminate steady-state error by adaptively changing the controller coefficients in the frequency domain according to the current error. In the time domain, the control scheme minimizes the derivative of a defined energy function in order to optimize the transient performance. Simulation and experimental results obtained from a 3.3-kW grid-connected ac/dc converter demonstrate its superior performance.

• 出版日期2017-5