一种用于低功率开关磁阻电机驱动的无桥整流器及其改进的电能质量

Power quality (PQ) issues are present in early stages of designing grid-fed low power switched reluctance motor (SRM) drive using a conventional diode bridge rectifier (DBR) built DC link voltage. Main causes of this are problems with low power factors (LPF) and excessive total harmonic distortion (THD) in supply current. The primary focus of this paper is to tackle challenges associated with LPF and high THD supply current. This is achieved through integration of a front-end high-power factor converter (HPFC). Additionally, it explores a cost-effective solution suitable for low-power drives, which involves employing a four-phase switched reluctance motor (SRM) with assistance from a mid-point converter (MPC). This approach requires dual output balanced DC link voltage. Therefore, a dual output single switch Cuk modified bridgeless (DOSSCMBL) converter is presented for SRM drive control along with maintaining supply power quality in compliance with an IEC-61000-3-2 standard. Unlike bridgeless Cuk converter, advantages of presented DOSSCMBL converter are single switch gate driver requirement, no circulating current through an antiparallel diode, low switching losses and conduction losses. For low-cost SRM drive, discontinuous conduction mode (DCM) converter operation is selected which is capable of self-power factor correction and buck-boost voltage gain incorporating simple control for wide-range speed operation. DOSSCMBL-fed SRM drive undergoes simulation, facilitated by meticulous design of its components. This encompasses an examination of its various modes of operation and an in-depth analysis of both drive's performance and its associated control circuitry. Performance is rigorously validated through experimental testing conducted across a diverse set of operating conditions. Finally, findings are meticulously documented and presented to substantiate performance assurances.