Abstract
This paper applies the emerging hybrid active third-harmonic current injection converter (H3C) to the battery energy storage system (BESS), forming a novel H3C-BESS structure. Compared with the commonly used two-stage VSC-BESS, the proposed H3C-BESS has the capability to reduce the passive components and switching losses. The operation principle of the H3C-BESS is analyzed and the mathematical model is derived. The closed-loop control strategy and controller design are proposed for different operation modes of the system, which include the battery current/voltage control and the injected harmonic current control. In particular, active damping control is realized through the grid current control, which could suppress the LC-filter resonance without the need of passive damping resistors. Simulation results show that the proposed topology and its control strategy have fast dynamic response, with a setup time of less than 4 ms. In addition, the total harmonic distortions of battery current and grid currents are only 2.54% and 3.15%, respectively. The amplitude of the injected harmonic current is only half of the grid current, indicating that the current injection circuit generates low losses. Experimental results are also provided to verify the validity of the proposed solution.
Highlights
Compared with the voltage source converter (VSC) operating at high switching frequency, the switching loss generated by grid voltage selector (GVS) is ignorable [23]; the half-bridge in the harmonic injection circuit works in chopping mode, the maximum chopped current is only half of the grid current amplitude
Ence battery currentloop ib is calculated from the grid current reference i gd in an open-loop way. ib steps between 2 A and 4 A
Active damping control was realized through the grid current control, which could suppress the LC-filter resonance without the need of passive damping resistors
Summary
With the massive penetration of renewable energy resources such as the photovoltaic and wind power, the grid voltage and frequency stability are being threatened because of the high volatility of the renewable energy [1,2]. Has been suggested as a promising solution to suppress the power fluctuations and enables more integration of renewable energy [3,4]. The BESS could be used to protect important loads from grid fault conditions. Due to these merits, the BESS has attracted tremendous attention worldwide [5,6]
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