Chang, C.-H.C.-H.ChangWu, F.-Y.F.-Y.WuYAOW-MING CHEN2018-09-102018-09-102012http://www.scopus.com/inward/record.url?eid=2-s2.0-84862996846&partnerID=MN8TOARShttp://scholars.lib.ntu.edu.tw/handle/123456789/372720The objective of this paper is to propose a modularized bidirectional single-phase grid-connected inverter (BGI) with constant-frequency asynchronous sigma-delta modulation (CF-ASDM) control for the renewable energy (RE)-supplied dc power system. The proposed BGI can be operated either in the inverter mode (IM) or rectified mode (RM); both are necessary features for the RE-supplied dc power system. By comparing to the conventional ASDM with variable switching frequency, the proposed CF-ASDM can simplify the filter design and can reduce the computational burden of the digital signal processor while maintaining the merit of quick dynamic response. Moreover, the proposed BGI has a redundant central controller which can increase the system reliability. The major contribution of this paper includes developing the modularized BGI with CF-ASDM control scheme for IM and RM operations thoroughly and applying it to the RE-supplied dc power system successfully. In this paper, the mathematical equations to achieve the constant switching frequency operation for the CF-ASDM will be derived. Computer simulations and hardware experiments are shown to verify the performance of the proposed modularized BGI with CF-ASDM control. © 2011 IEEE.Asynchronous sigma-delta modulation (ASDM); bidirectional; constant frequency; dc power system; modularization; single-phase grid-connected inverter[SDGs]SDG7bidirectional; Constant frequency; Dc power systems; Grid connected inverters; Modularizations; Computer simulation; Dynamic response; Modular construction; Signal processing; Switching frequency; Delta sigma modulationjournal article10.1109/TIE.2011.2176693