Abstract
A diagnostic method for an open-circuit switch failure in a hybrid active neutral-point clamped (HANPC) inverter is proposed in this paper. The switching leg of the HANPC inverter consists of four silicon insulated gate bipolar transistors and two silicon carbide metal-oxide-semiconductor field-effect transistors to achieve higher efficiency and power density compared to conventional neutral-point clamped inverters. When an open-circuit failure occurs in a switching device, the output current is severely distorted, causing damage to the inverter and the connected loads. The proposed diagnostic method aims to detect the open-switch failure and protect the related devices without additional sensors or circuits. The faulty conditions of six different switches are investigated based on the current distortion in the stationary reference frame. By analyzing the individual characteristic of each switch failure, it is possible to detect the exact location of the failed switch in a short period. The effectiveness and feasibility of the proposed fault-diagnostic method are verified using simulation and experimental results.
Highlights
With increasing industrial energy loads and distributed generation systems, battery energy storage systems (BESSs) are widely adopted to limit the peak electric power demand and stabilize the power grid [1]
Energy management using the BESS reduces the needs for the entire generation capacity and gives flexibility in power distribution
The power conditioning system (PCS) carries out the power conversion between the grid-side alternative current (AC) and the battery-side direct current (DC)
Summary
With increasing industrial energy loads and distributed generation systems, battery energy storage systems (BESSs) are widely adopted to limit the peak electric power demand and stabilize the power grid [1]. The BESS stores electricity from renewable energy resources or the grid to lithium secondary battery packs and provides energy to homes or businesses [2]. Energy management using the BESS reduces the needs for the entire generation capacity and gives flexibility in power distribution. The BESS consists of three major parts: the energy management system (EMS), the power conditioning system (PCS), and the battery. The PCS carries out the power conversion between the grid-side alternative current (AC) and the battery-side direct current (DC). The PCS controls the direction of power flow from the grid to the battery or vice versa based on demand. Three-level (3L) neutral-point clamped (NPC) inverters are suitable for the medium-power
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