LI Zhaohui, SUN Xin, TENG Weijun. Active damping control strategy for improving PCS parallel stability[J]. Thermal power generation, 2021, 50(5): 147-152.
LI Zhaohui, SUN Xin, TENG Weijun. Active damping control strategy for improving PCS parallel stability[J]. Thermal power generation, 2021, 50(5): 147-152. DOI: 10.19666/j.rlfd.202007196.
Power converter system(PCS) is an important component of the energy storage system
and suppressing the resonant spike of the PCS parallel system helps to improve the stability of the PCS grid-connected operation. This paper analyzes the principle of suppression of resonance spikes in multiple PCS parallel systems
and studies the parallel virtual resistance to suppress the resonance spikes at 897 Hz. At the same time
an active damping control strategy based on a digital low-pass filter is proposed. By introducing virtual impedance to increase the damping of the system
the harmonic content in the output current of the system is significantly reduced
thus the resonance spike of the PCS parallel system is suppressed and the parallel stability of the PCS system is improved.