Open-Switch Fault Diagnosis and Fault Tolerant for Matrix Converter With Finite Control Set-Model Predictive Control

Error-Voltage-Based Open-Switch Fault Diagnosis Strategy for Matrix Converters with Model Predictive Control Method

“…To validate the universality of the proposed fault diagnosis method, the reference load current frequency is set as same as the source voltage frequency. The open-circuit fault switch in this condition is difficult to be detected for the fault diagnosis method in [25]. The experimental result for the proposed fault diagnosis method in this paper is shown in Fig.…”

“…7 show the simulation results of the MC system with * = 10A, = 30Hz during normal and faulty operation when the fault diagnosis and tolerant methods are activated. The fault diagnosis method in Section IV is applied while the fault tolerant strategy in [25] is applied. The fault tolerant strategy selects the appropriate switching state for the remaining eight switches to minimize the error between the load current and the reference current.…”

“…11 (b), the diagnosis time is only a sampling period time (100us). To obtain the better quality of the load current under faulty operation without additional hardware, the fault tolerant strategy in [25] is applied. To validate the universality of the proposed fault diagnosis method, the reference load current frequency is set as same as the source voltage frequency.…”

“…In [25] a fault diagnosis method for MCs is proposed which monitors the load currents and considers the switching state to locate the faulty switch. It is simpler to diagnose the exact location of the open-circuit switch in a MC with FCS-MPC.…”

“…ii) The phase difference between the input voltage and the output current is π. The current-based fault diagnosis [25] has been proposed for MC with FCS-MPC. However, voltage-based fault diagnosis strategy for MC with FCS-MPC has not been considered but may have some important advantages.…”